U.S. patent application number 16/104615 was filed with the patent office on 2019-02-21 for method and apparatus for multiplexing higher-resolution channel state information (csi).
The applicant listed for this patent is Samsung Electronics Co., Ltd.. Invention is credited to Li Guo, Eko Onggosanusi, Md. Saifur Rahman.
Application Number | 20190059013 16/104615 |
Document ID | / |
Family ID | 65360914 |
Filed Date | 2019-02-21 |
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United States Patent
Application |
20190059013 |
Kind Code |
A1 |
Rahman; Md. Saifur ; et
al. |
February 21, 2019 |
METHOD AND APPARATUS FOR MULTIPLEXING HIGHER-RESOLUTION CHANNEL
STATE INFORMATION (CSI)
Abstract
A method of user equipment (UE) for channel state information
(CSI) is provided. The UE comprises receiving configuration
information for K CSI reports, wherein the configuration
information includes resource allocation information for an uplink
control information (UCI) transmission that includes UCI comprising
N UCI parts, calculating the K CSI reports and partitioning the K
CSI reports into N parts, determining an available number of
information bits (B1) for the UCI transmission according to the
resource allocation information, determining a required number of
information bits (B2) for the UCI transmission according to the
calculated K CSI reports, determining whether the B2 exceeds the
B1; and transmitting, to the BS over one slot of an uplink channel,
a first part of the N UCI parts including a first of the N parts of
the K CSI reports when the B2 exceeds the B1, wherein K and N are
positive integers.
Inventors: |
Rahman; Md. Saifur; (Plano,
TX) ; Onggosanusi; Eko; (Coppell, TX) ; Guo;
Li; (Allen, TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Samsung Electronics Co., Ltd. |
Suwon-si |
|
KR |
|
|
Family ID: |
65360914 |
Appl. No.: |
16/104615 |
Filed: |
August 17, 2018 |
Related U.S. Patent Documents
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Application
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Patent Number |
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62548222 |
Aug 21, 2017 |
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62556771 |
Sep 11, 2017 |
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62557320 |
Sep 12, 2017 |
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62558120 |
Sep 13, 2017 |
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62559322 |
Sep 15, 2017 |
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62559961 |
Sep 18, 2017 |
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62564612 |
Sep 28, 2017 |
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62566916 |
Oct 2, 2017 |
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62569765 |
Oct 9, 2017 |
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62570293 |
Oct 10, 2017 |
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62594886 |
Dec 5, 2017 |
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62609931 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04B 7/0695 20130101;
H04W 72/0413 20130101; H04L 1/0028 20130101; H04W 72/0446 20130101;
H04L 5/0057 20130101; H04B 7/0478 20130101; H04B 7/088 20130101;
H04L 1/0026 20130101; H04W 24/10 20130101; H04L 1/00 20130101; H04W
72/10 20130101 |
International
Class: |
H04W 24/10 20060101
H04W024/10; H04W 72/04 20060101 H04W072/04; H04W 72/10 20060101
H04W072/10 |
Claims
1. A user equipment (UE) for channel state information (CSI)
reporting in a wireless communication system, the UE comprising: a
transceiver configured to receive, from a base station (BS),
configuration information for K CSI reports, wherein the
configuration information includes resource allocation information
for an uplink control information (UCI) transmission that includes
UCI comprising N UCI parts; a processor operably connected to the
transceiver, the processor configured to: calculate the K CSI
reports and partition the K CSI reports into N parts; determine an
available number of information bits (B1) for the UCI transmission
according to the resource allocation information; determine a
required number of information bits (B2) for the UCI transmission
according to the calculated K CSI reports; and determine whether
the required number of information bits (B2) exceeds the available
number of information bits (B1), wherein the transceiver is further
configured to transmit, to the BS over one slot of an uplink
channel, a first part of the N UCI parts including a first of the N
parts of the K CSI reports when the required number of information
bits (B2) exceeds the available number of information bits (B1),
wherein K and N are positive integers.
2. The UE of claim 1, wherein N is two and K is greater or equal to
one.
3. The UE of claim 2, wherein: the processor is further configured
to: partition a second part of the N UCI parts into 2K+1 sub-parts,
each of which includes a sub-part of a second of the N parts of the
K CSI reports; allocate a priority index to each of the 2K+1
sub-parts for the UCI transmission; and determine a partial part of
the second part of the N UCI parts when the required number of
information bits (B2) exceeds the available number of information
bits (B1); and the transceiver is further configured to transmit,
to the BS over one slot of the uplink channel, the first part of
the N UCI parts and the partial part of the second part of the N
UCI parts, wherein the partial part of the second part of the N UCI
parts comprises M sub-parts out of the 2K+1 sub-parts that have a
highest priority for the UCI transmission based on the priority
index, where M is a largest integer greater or equal to zero and
less than 2K+1 sub-parts, and wherein another required number of
information bits (B3) for a transmission of the first part of the N
UCI parts and the partial part of the second part of the N UCI
parts does not exceed the available number of information bits
(B1).
4. The UE of claim 3, wherein an increasing order of the priority
index (0, 1, 2, . . . , 2K) corresponding to each of the 2K+1
sub-parts is mapped to a decreasing order of a priority for the UCI
transmission.
5. The UE of claim 3, wherein: a first part of the 2K+1 sub-parts
includes wideband second CSI parts of the K CSI reports; a (2i)-th
part of the 2K+1 sub-parts includes sub-band second CSI part of
even-numbered sub-bands for an i-th part of the K CSI reports; a
(2i+1)-th part of the 2K+1 sub-parts includes sub-band second CSI
part of odd-numbered sub-bands for the i-th part of the K CSI
reports; i=1, 2, . . . , K; and a wideband CSI is commonly reported
for all sub-bands and a sub-band CSI is reported for each of the
sub-bands.
6. The UE of claim 3, wherein: the processor is further configured
to: determine symbols for a number of information bits for the
second part of the N UCI parts based on a modulation coding scheme
(MCS) and a beta offset value; and determine whether a UCI code
rate associated with the symbols for the number of information bits
for the second part of the N UCI parts exceeds a threshold code
rate (c.sub.T); and the transceiver is further configured to
transmit, to the BS over one slot of the uplink channel, the first
part of the N UCI parts and the partial part of the second part of
the N UCI parts when the UCI code rate associated with the symbols
for the number of information bits for the second part of the N UCI
parts exceeds the threshold code rate (c.sub.T).
7. The UE of claim 6, wherein the threshold code rate (c.sub.T) is
determined by c T = c MCS .beta. offset CSI - 2 , ##EQU00011##
wherein c.sub.MCS is a target code rate for a physical uplink
shared channel (PUSCH) on offset which the UCI transmission is
performed, and wherein .beta..sub.offset.sup.CSI-2 is the beta
offset value for the second part of the N UCI parts.
8. A base station (BS) for channel state information (CSI)
reporting in a wireless communication system, the BS comprising: a
transceiver configured to: transmit, to a user equipment (UE),
configuration information for K CSI reports, wherein the
configuration information includes resource allocation information
for an uplink control information (UCI) transmission that includes
UCI comprising N UCI parts; and receive, from the UE over one slot
of an uplink channel, a first part of the N UCI parts including a
first of N parts of K CSI reports when a required number of
information bits (B2) exceeds an available number of information
bits (B1), wherein K and N are positive integers, and wherein, at
the UE: the K CSI reports are calculated and partitioned into N
parts; the available number of information bits (B1) for the UCI
transmission according to the resource allocation information is
determined; the required number of information bits (B2) for the
UCI transmission according to the calculated K CSI reports is
determined; and whether the required number of information bits
(B2) exceeds the available number of information bits (B1) is
determined.
9. The BS of claim 8, wherein N is two and K is greater or equal to
one.
10. The BS of claim 9, wherein the transceiver is further
configured to receive, from the UE over one slot of the uplink
channel, the first part of the N UCI parts and a partial part of a
second part of the N UCI parts, wherein, at the UE: the second part
of the N UCI parts is partitioned into 2K+1 sub-parts, each of
which includes a sub-part of a second of the N parts of the K CSI
reports; a priority index is allocated to each of the 2K+1
sub-parts for the UCI transmission; and the partial part of the
second part of the N UCI parts is determined when the required
number of information bits (B2) exceeds the available number of
information bits (B1), wherein the partial part of the second part
of the N UCI parts comprises M sub-parts out of 2K+1 sub-parts that
have a highest priority for the UCI transmission based on the
priority index, wherein M is a largest integer greater or equal to
zero and less than 2K+1 sub-parts, and wherein another required
number of information bits (B3) for a transmission of the first
part of the N UCI parts and the partial part of the second part of
the N UCI parts does not exceed the available number of information
bits (B1).
11. The BS of claim 10, wherein an increasing order of the priority
index (0, 1, 2, . . . , 2K) corresponding to each of the 2K+1
sub-parts is mapped to a decreasing order of a priority for the UCI
transmission.
12. The BS of claim 10, wherein: a first part of the 2K+1 sub-parts
includes wideband second CSI parts of the K CSI reports; a (2i)-th
part of the 2K+1 sub-parts includes sub-band second CSI part of
even-numbered sub-bands for an i-th part of the K CSI reports; a
(2i+1)-th part of the 2K+1 sub-parts includes sub-band second CSI
part of odd-numbered sub-bands for the i-th part of the K CSI
reports; i=1, 2, . . . , K; and a wideband CSI is commonly reported
for all sub-bands and a sub-band CSI is reported for each of the
sub-bands.
13. The BS of claim 10, wherein the transceiver is further
configured to receive, from the UE over one slot of the uplink
channel, the first part of the N UCI parts and the partial part of
the second part of the N UCI parts when a UCI code rate associated
with symbols for a number of information bits for the second part
of the N UCI parts exceeds a threshold code rate (c.sub.T),
wherein, at the UE: the symbols are determined for the number of
information bits for the second part of the N UCI parts based on a
modulation coding scheme (MCS) and a beta offset value; and whether
the UCI code rate associated with the symbols for the number of
information bits for the second part of the N UCI parts exceeds the
threshold code rate (c.sub.T) is determined, the threshold code
rate (c.sub.T) being determined by c T = c MCS .beta. offset CSI -
2 , ##EQU00012## wherein C.sub.MCS is a target code rate for a
physical uplink shared channel (PUSCH) on which the UCI
transmission is performed, and wherein .beta..sub.offset.sup.CSI-2
is the beta offset value for the second part of the N UCI
parts.
14. A method of user equipment (UE) for channel state information
(CSI) reporting in a wireless communication system, the method
comprising: receiving, from a base station (BS), configuration
information for K CSI reports, wherein the configuration
information includes resource allocation information for an uplink
control information (UCI) transmission that includes UCI comprising
N UCI parts; calculating the K CSI reports and partitioning the K
CSI reports into N parts; determining an available number of
information bits (B1) for the UCI transmission according to the
resource allocation information; determining a required number of
information bits (B2) for the UCI transmission according to the
calculated K CSI reports; determining whether the required number
of information bits (B2) exceeds the available number of
information bits (B1); and transmitting, to the BS over one slot of
an uplink channel, a first part of the N UCI parts including a
first of the N parts of the K CSI reports when the required number
of information bits (B2) exceeds the available number of
information bits (B1), wherein K and N are positive integers.
15. The method of claim 14, wherein N is two and K is greater or
equal to one.
16. The method of claim 15, further comprising: partitioning a
second part of the N UCI parts into 2K+1 sub-parts, each of which
includes a sub-part of a second of the N parts of the K CSI
reports; allocating a priority index to each of the 2K+1 sub-parts
for the UCI transmission; determining a partial part of the second
part of the N UCI parts when the required number of information
bits (B2) exceeds the available number of information bits (B1);
and transmitting, to the BS over one slot of the uplink channel,
the first part of the N UCI parts and the partial part of the
second part of the N UCI parts, wherein the partial part of the
second part of the N UCI parts comprises M sub-parts out of the
2K+1 sub-parts that have a highest priority for the UCI
transmission based on the priority index, where M is a largest
integer greater or equal to zero and less than 2K+1 sub-parts, and
wherein another required number of information bits (B3) for a
transmission of the first part of the N UCI parts and the partial
part of the second part of the N UCI parts does not exceed the
available number of information bits (B1).
17. The method of claim 16, wherein an increasing order of the
priority index (0, 1, 2, . . . , 2K) corresponding to each of the
2K+1 sub-parts is mapped to a decreasing order of a priority for
the UCI transmission.
18. The method of claim 16, wherein: a first part of the 2K+1
sub-parts includes wideband second CSI parts of the K CSI reports;
a (2i)-th part of the 2K+1 sub-parts includes sub-band second CSI
part of even-numbered sub-bands for an i-th part of the K CSI
reports; a (2i+1)-th part of the 2K+1 sub-parts includes sub-band
second CSI part of odd-numbered sub-bands for the i-th part of the
K CSI reports; i=1, 2, . . . , K; and a wideband CSI is commonly
reported for all sub-bands and a sub-band CSI is reported for each
of the sub-bands.
19. The method of claim 16, further comprising: determining symbols
for a number of information bits for the second part of the N UCI
parts based on a modulation coding scheme (MCS) and a beta offset
value; determining whether a UCI code rate associated with the
symbols for the number of information bits for the second part of
the N UCI parts exceeds a threshold code rate (c.sub.T); and
transmitting, to the BS over one slot of the uplink channel, the
first part of the N UCI parts and the partial part of the second
part of the N UCI parts when the UCI code rate associated with the
symbols for the number of information bits for the second part of
the N UCI parts exceeds the threshold code rate (c.sub.T).
20. The method of claim 19, wherein the threshold code rate
(c.sub.T) is determined by c T = c MCS .beta. offset CSI - 2 ,
##EQU00013## wherein c.sub.MCS is a target code rate for a physical
uplink shared channel (PUSCH) on which the UCI transmission is
performed, and wherein .beta..sub.offset.sup.CSI-2 is the beta
offset value for the second part of the N UCI parts.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY
[0001] The present application claims priority to:
[0002] U.S. Provisional Patent Application Ser. No. 62/548,222,
filed on Aug. 21, 2017;
[0003] U.S. Provisional Patent Application Ser. No. 62/556,711,
filed on Sep. 11, 2017;
[0004] U.S. Provisional Patent Application Ser. No. 62/557,320,
filed on Sep. 12, 2017;
[0005] U.S. Provisional Patent Application Ser. No. 62/558,120,
filed on Sep. 13, 2017;
[0006] U.S. Provisional Patent Application Ser. No. 62/559,322,
filed on Sep. 15, 2017;
[0007] U.S. Provisional Patent Application Ser. No. 62/559,961,
filed on Sep. 18, 2017;
[0008] U.S. Provisional Patent Application Ser. No. 62/564,612,
filed on Sep. 28, 2017;
[0009] U.S. Provisional Patent Application Ser. No. 62/566,916,
filed on Oct. 2, 2017;
[0010] U.S. Provisional Patent Application Ser. No. 62/569,765,
filed on Oct. 9, 2017;
[0011] U.S. Provisional Patent Application Ser. No. 62/570,293,
filed on Oct. 10, 2017;
[0012] U.S. Provisional Patent Application Ser. No. 62/594,886,
filed on Dec. 5, 2017; and
[0013] U.S. Provisional Patent Application Ser. No. 62/609,931,
filed on Dec. 22, 2017;
The content of the above-identified patent documents is
incorporated herein by reference.
TECHNICAL FIELD
[0014] The present disclosure relates generally to wireless
communication systems and, more specifically, to the multiplexing
higher-resolution channel state information (CSI) in an advanced
wireless communication system.
BACKGROUND
[0015] Understanding and correctly estimating the channel in an
advance wireless communication system between a user equipment (UE)
and an eNode B (eNB) is important for efficient and effective
wireless communication. In order to correctly estimate the channel
conditions, the UE may report (e.g., feedback) information about
channel measurement, e.g., CSI, to the eNB. With this information
about the channel, the eNB is able to select appropriate
communication parameters to efficiently and effectively perform
wireless data communication with the UE. However, with increase in
the numbers of antennas and channel paths of wireless communication
devices, so too has the amount of feedback increased that may be
needed to ideally estimate the channel. This additionally-desired
channel feedback may create additional overheads, thus reducing the
efficiency of the wireless communication, for example, decrease the
data rate.
SUMMARY
[0016] Embodiments of the present disclosure provide methods and
apparatuses for multiplexing higher-resolution channel state
information (CSI) in an advanced wireless communication system.
[0017] In one embodiment, a user equipment (UE) for channel state
information (CSI) reporting in a wireless communication system is
provided. The UE comprises a transceiver configured to receive,
from a base station (BS), configuration information for K CSI
reports, wherein the configuration information includes resource
allocation information for an uplink control information (UCI)
transmission that includes UCI comprising N UCI parts. The UE
further comprises a processor operably connected to the
transceiver, the processor configured to calculate the K CSI
reports and partition the K CSI reports into N parts, determine an
available number of information bits (B1) for the UCI transmission
according to the resource allocation information; determine a
required number of information bits (B2) for the UCI transmission
according to the calculated K CSI reports; and determine whether
the required number of information bits (B2) exceeds the available
number of information bits (B1), wherein the transceiver is further
configured to transmit, to the BS over one slot of an uplink
channel, a first part of the N UCI parts including a first of the N
parts of the K CSI reports when the required number of information
bits (B2) exceeds the available number of information bits (B1),
wherein K and N are positive integers.
[0018] In another embodiment, a base station (BS) for channel state
information (CSI) reporting in a wireless communication system is
provided. The BS comprises a transceiver configured to transmit, to
a user equipment (UE), configuration information for K CSI reports,
wherein the configuration information includes resource allocation
information for an uplink control information (UCI) transmission
that includes UCI comprising N UCI parts; and receive, from the UE
over one slot of an uplink channel, a first part of the N UCI parts
including a first of N parts of K CSI reports when a required
number of information bits (B2) exceeds an available number of
information bits (B1), wherein K and N are positive integers, and
wherein, at the UE: the K CSI reports are calculated and
partitioned into N parts; the available number of information bits
(B1) for the UCI transmission according to the resource allocation
information is determined; the required number of information bits
(B2) for the UCI transmission according to the calculated K CSI
reports is determined; and whether the required number of
information bits (B2) exceeds the available number of information
bits (B1) is determined.
[0019] In yet another embodiment, a method of user equipment (UE)
for channel state information (CSI) reporting in a wireless
communication system is provided. The method comprises receiving,
from a base station (BS), configuration information for K CSI
reports, wherein the configuration information includes resource
allocation information for an uplink control information (UCI)
transmission that includes UCI comprising N UCI parts; calculating
the K CSI reports and partitioning the K CSI reports into N parts;
determining an available number of information bits (B1) for the
UCI transmission according to the resource allocation information;
determining a required number of information bits (B2) for the UCI
transmission according to the calculated K CSI reports; determining
whether the required number of information bits (B2) exceeds the
available number of information bits (B1); and transmitting, to the
BS over one slot of an uplink channel, a first part of the N UCI
parts including a first of the N parts of the K CSI reports when
the required number of information bits (B2) exceeds the available
number of information bits (B1), wherein K and N are positive
integers.
[0020] Other technical features may be readily apparent to one
skilled in the art from the following figures, descriptions, and
claims.
[0021] Before undertaking the DETAILED DESCRIPTION below, it may be
advantageous to set forth definitions of certain words and phrases
used throughout this patent document. The term "couple" and its
derivatives refer to any direct or indirect communication between
two or more elements, whether or not those elements are in physical
contact with one another. The terms "transmit," "receive," and
"communicate," as well as derivatives thereof, encompass both
direct and indirect communication. The terms "include" and
"comprise," as well as derivatives thereof, mean inclusion without
limitation. The term "or" is inclusive, meaning and/or. The phrase
"associated with," as well as derivatives thereof, means to
include, be included within, interconnect with, contain, be
contained within, connect to or with, couple to or with, be
communicable with, cooperate with, interleave, juxtapose, be
proximate to, be bound to or with, have, have a property of, have a
relationship to or with, or the like. The term "controller" means
any device, system or part thereof that controls at least one
operation. Such a controller may be implemented in hardware or a
combination of hardware and software and/or firmware. The
functionality associated with any particular controller may be
centralized or distributed, whether locally or remotely. The phrase
"at least one of," when used with a list of items, means that
different combinations of one or more of the listed items may be
used, and only one item in the list may be needed. For example, "at
least one of: A, B, and C" includes any of the following
combinations: A, B, C, A and B, A and C, B and C, and A and B and
C.
[0022] Moreover, various functions described below can be
implemented or supported by one or more computer programs, each of
which is formed from computer readable program code and embodied in
a computer readable medium. The terms "application" and "program"
refer to one or more computer programs, software components, sets
of instructions, procedures, functions, objects, classes,
instances, related data, or a portion thereof adapted for
implementation in a suitable computer readable program code. The
phrase "computer readable program code" includes any type of
computer code, including source code, object code, and executable
code. The phrase "computer readable medium" includes any type of
medium capable of being accessed by a computer, such as read only
memory (ROM), random access memory (RAM), a hard disk drive, a
compact disc (CD), a digital video disc (DVD), or any other type of
memory. A "non-transitory" computer readable medium excludes wired,
wireless, optical, or other communication links that transport
transitory electrical or other signals. A non-transitory computer
readable medium includes media where data can be permanently stored
and media where data can be stored and later overwritten, such as a
rewritable optical disc or an erasable memory device.
[0023] Definitions for other certain words and phrases are provided
throughout this patent document. Those of ordinary skill in the art
should understand that in many if not most instances, such
definitions apply to prior as well as future uses of such defined
words and phrases.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] For a more complete understanding of the present disclosure
and its advantages, reference is now made to the following
description taken in conjunction with the accompanying drawings, in
which like reference numerals represent like parts:
[0025] FIG. 1 illustrates an example wireless network according to
embodiments of the present disclosure;
[0026] FIG. 2 illustrates an example eNB according to embodiments
of the present disclosure;
[0027] FIG. 3 illustrates an example UE according to embodiments of
the present disclosure;
[0028] FIG. 4A illustrates a high-level diagram of an orthogonal
frequency division multiple access transmit path according to
embodiments of the present disclosure;
[0029] FIG. 4B illustrates a high-level diagram of an orthogonal
frequency division multiple access receive path according to
embodiments of the present disclosure;
[0030] FIG. 5 illustrates a transmitter block diagram for a PDSCH
in a subframe according to embodiments of the present
disclosure;
[0031] FIG. 6 illustrates a receiver block diagram for a PDSCH in a
subframe according to embodiments of the present disclosure;
[0032] FIG. 7 illustrates a transmitter block diagram for a PUSCH
in a subframe according to embodiments of the present
disclosure;
[0033] FIG. 8 illustrates a receiver block diagram for a PUSCH in a
subframe according to embodiments of the present disclosure;
[0034] FIG. 9 illustrates an example multiplexing of two slices
according to embodiments of the present disclosure;
[0035] FIG. 10 illustrates an example antenna blocks according to
embodiments of the present disclosure;
[0036] FIG. 11 illustrates an example two-part UCI design according
to embodiments of the present disclosure;
[0037] FIG. 12A illustrates another example two-part UCI design
according to embodiments of the present disclosure;
[0038] FIG. 12B illustrates yet another example two-part UCI design
according to embodiments of the present disclosure;
[0039] FIG. 12C illustrates yet another example two-part UCI design
according to embodiments of the present disclosure;
[0040] FIG. 13 illustrates an example transmission priority
according to embodiments of the present disclosure;
[0041] FIG. 14 illustrates an example three-part UCI design
according to embodiments of the present disclosure;
[0042] FIG. 15 illustrates another example three-part UCI design
according to embodiments of the present disclosure;
[0043] FIG. 16 illustrates an example multi-beam based system
according to embodiments of the present disclosure; and
[0044] FIG. 17 illustrates an example beam report according to
embodiments of the present disclosure.
DETAILED DESCRIPTION
[0045] FIG. 1 through FIG. 17, discussed below, and the various
embodiments used to describe the principles of the present
disclosure in this patent document are by way of illustration only
and should not be construed in any way to limit the scope of the
disclosure. Those skilled in the art will understand that the
principles of the present disclosure may be implemented in any
suitably arranged system or device.
[0046] The following documents and standards descriptions are
hereby incorporated by reference into the present disclosure as if
fully set forth herein: 3GPP TS 36.211 v14.2.0, "E-UTRA, Physical
channels and modulation;" 3GPP TS 36.212 v14.2.0, "E-UTRA,
Multiplexing and Channel coding;" 3GPP TS 36.213 v14.2.0 "E-UTRA,
Physical Layer Procedures;" 3GPP TS 36.321 v14.2.0, "E-UTRA, Medium
Access Control (MAC) protocol specification;" 3GPP TS 36.331
v14.2.0, "E-UTRA, Radio Resource Control (RRC) protocol
specification;" 3GPP TR 22.891 v1.2.0, "Feasibility Study on New
Services and Markets Technology Enablers;" and 3GPP TR 38.802
v14.2.0, "Study on New Radio Access Technology Physical Layer
Aspect."
[0047] Aspects, features, and advantages of the disclosure are
readily apparent from the following detailed description, simply by
illustrating a number of particular embodiments and
implementations, including the best mode contemplated for carrying
out the disclosure. The disclosure is also capable of other and
different embodiments, and its several details can be modified in
various obvious respects, all without departing from the spirit and
scope of the disclosure. Accordingly, the drawings and description
are to be regarded as illustrative in nature, and not as
restrictive. The disclosure is illustrated by way of example, and
not by way of limitation, in the figures of the accompanying
drawings.
[0048] In the following, for brevity, both FDD and TDD are
considered as the duplex method for both DL and UL signaling.
[0049] Although exemplary descriptions and embodiments to follow
assume orthogonal frequency division multiplexing (OFDM) or
orthogonal frequency division multiple access (OFDMA), this
disclosure can be extended to other OFDM-based transmission
waveforms or multiple access schemes such as filtered OFDM
(F-OFDM).
[0050] The present disclosure covers several components which can
be used in conjunction or in combination with one another, or can
operate as standalone schemes.
[0051] To meet the demand for wireless data traffic having
increased since deployment of 4G communication systems, efforts
have been made to develop an improved 5G or pre-5G communication
system. Therefore, the 5G or pre-5G communication system is also
called a "beyond 4G network" or a "post LTE system."
[0052] The 5G communication system is considered to be implemented
in higher frequency (mmWave) bands, e.g., 60 GHz bands, so as to
accomplish higher data rates. To decrease propagation loss of the
radio waves and increase the transmission coverage, the
beamforming, massive multiple-input multiple-output (MIMO), full
dimensional MIMO (FD-MIMO), array antenna, an analog beam forming,
large scale antenna techniques and the like are discussed in 5G
communication systems.
[0053] In addition, in 5G communication systems, development for
system network improvement is under way based on advanced small
cells, cloud radio access networks (RANs), ultra-dense networks,
device-to-device (D2D) communication, wireless backhaul
communication, moving network, cooperative communication,
coordinated multi-points (CoMP) transmission and reception,
interference mitigation and cancellation and the like.
[0054] In the 5G system, hybrid frequency shift keying and
quadrature amplitude modulation (FQAM) and sliding window
superposition coding (SWSC) as an adaptive modulation and coding
(AMC) technique, and filter bank multi carrier (FBMC),
non-orthogonal multiple access (NOMA), and sparse code multiple
access (SCMA) as an advanced access technology have been
developed.
[0055] FIGS. 1-4B below describe various embodiments implemented in
wireless communications systems and with the use of orthogonal
frequency division multiplexing (OFDM) or orthogonal frequency
division multiple access (OFDMA) communication techniques. The
descriptions of FIGS. 1-3 are not meant to imply physical or
architectural limitations to the manner in which different
embodiments may be implemented. Different embodiments of the
present disclosure may be implemented in any suitably-arranged
communications system.
[0056] FIG. 1 illustrates an example wireless network according to
embodiments of the present disclosure. The embodiment of the
wireless network shown in FIG. 1 is for illustration only. Other
embodiments of the wireless network 100 could be used without
departing from the scope of this disclosure.
[0057] As shown in FIG. 1, the wireless network includes an eNB
101, an eNB 102, and an eNB 103. The eNB 101 communicates with the
eNB 102 and the eNB 103. The eNB 101 also communicates with at
least one network 130, such as the Internet, a proprietary Internet
Protocol (IP) network, or other data network.
[0058] The eNB 102 provides wireless broadband access to the
network 130 for a first plurality of user equipments (UEs) within a
coverage area 120 of the eNB 102. The first plurality of UEs
includes a UE 111, which may be located in a small business (SB); a
UE 112, which may be located in an enterprise (E); a UE 113, which
may be located in a WiFi hotspot (HS); a UE 114, which may be
located in a first residence (R); a UE 115, which may be located in
a second residence (R); and a UE 116, which may be a mobile device
(M), such as a cell phone, a wireless laptop, a wireless PDA, or
the like. The eNB 103 provides wireless broadband access to the
network 130 for a second plurality of UEs within a coverage area
125 of the eNB 103. The second plurality of UEs includes the UE 115
and the UE 116. In some embodiments, one or more of the eNBs
101-103 may communicate with each other and with the UEs 111-116
using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication
techniques.
[0059] Depending on the network type, the term "base station" or
"BS" can refer to any component (or collection of components)
configured to provide wireless access to a network, such as
transmit point (TP), transmit-receive point (TRP), an enhanced base
station (eNodeB or eNB), a 5G base station (gNB), a macrocell, a
femtocell, a WiFi access point (AP), or other wirelessly enabled
devices. Base stations may provide wireless access in accordance
with one or more wireless communication protocols, e.g., 5G 3GPP
new radio interface/access (NR), long term evolution (LTE), LTE
advanced (LTE-A), high speed packet access (HSPA), Wi-Fi
802.11a/b/g/n/ac, etc. For the sake of convenience, the terms "BS"
and "TRP" are used interchangeably in this patent document to refer
to network infrastructure components that provide wireless access
to remote terminals. Also, depending on the network type, the term
"user equipment" or "UE" can refer to any component such as "mobile
station," "subscriber station," "remote terminal," "wireless
terminal," "receive point," or "user device." For the sake of
convenience, the terms "user equipment" and "UE" are used in this
patent document to refer to remote wireless equipment that
wirelessly accesses a BS, whether the UE is a mobile device (such
as a mobile telephone or smartphone) or is normally considered a
stationary device (such as a desktop computer or vending
machine).
[0060] Dotted lines show the approximate extents of the coverage
areas 120 and 125, which are shown as approximately circular for
the purposes of illustration and explanation only. It should be
clearly understood that the coverage areas associated with eNBs,
such as the coverage areas 120 and 125, may have other shapes,
including irregular shapes, depending upon the configuration of the
eNBs and variations in the radio environment associated with
natural and man-made obstructions.
[0061] As described in more detail below, one or more of the UEs
111-116 include circuitry, programming, or a combination thereof,
for efficient multiplexing higher-resolution channel state
information (CSI) in an advanced wireless communication system. In
certain embodiments, and one or more of the eNBs 101-103 includes
circuitry, programming, or a combination thereof, for efficient
multiplexing higher-resolution channel state information (CSI) in
an advanced wireless communication system.
[0062] Although FIG. 1 illustrates one example of a wireless
network, various changes may be made to FIG. 1. For example, the
wireless network could include any number of eNBs and any number of
UEs in any suitable arrangement. Also, the eNB 101 could
communicate directly with any number of UEs and provide those UEs
with wireless broadband access to the network 130. Similarly, each
eNB 102-103 could communicate directly with the network 130 and
provide UEs with direct wireless broadband access to the network
130. Further, the eNBs 101, 102, and/or 103 could provide access to
other or additional external networks, such as external telephone
networks or other types of data networks.
[0063] FIG. 2 illustrates an example eNB 102 according to
embodiments of the present disclosure. The embodiment of the eNB
102 illustrated in FIG. 2 is for illustration only, and the eNBs
101 and 103 of FIG. 1 could have the same or similar configuration.
However, eNBs come in a wide variety of configurations, and FIG. 2
does not limit the scope of this disclosure to any particular
implementation of an eNB.
[0064] As shown in FIG. 2, the eNB 102 includes multiple antennas
205a-205n, multiple RF transceivers 210a-210n, transmit (TX)
processing circuitry 215, and receive (RX) processing circuitry
220. The eNB 102 also includes a controller/processor 225, a memory
230, and a backhaul or network interface 235.
[0065] The RF transceivers 210a-210n receive, from the antennas
205a-205n, incoming RF signals, such as signals transmitted by UEs
in the network 100. The RF transceivers 210a-210n down-convert the
incoming RF signals to generate IF or baseband signals. The IF or
baseband signals are sent to the RX processing circuitry 220, which
generates processed baseband signals by filtering, decoding, and/or
digitizing the baseband or IF signals. The RX processing circuitry
220 transmits the processed baseband signals to the
controller/processor 225 for further processing.
[0066] The TX processing circuitry 215 receives analog or digital
data (such as voice data, web data, e-mail, or interactive video
game data) from the controller/processor 225. The TX processing
circuitry 215 encodes, multiplexes, and/or digitizes the outgoing
baseband data to generate processed baseband or IF signals. The RF
transceivers 210a-210n receive the outgoing processed baseband or
IF signals from the TX processing circuitry 215 and up-converts the
baseband or IF signals to RF signals that are transmitted via the
antennas 205a-205n.
[0067] The controller/processor 225 can include one or more
processors or other processing devices that control the overall
operation of the eNB 102. For example, the controller/processor 225
could control the reception of forward channel signals and the
transmission of reverse channel signals by the RF transceivers
210a-210n, the RX processing circuitry 220, and the TX processing
circuitry 215 in accordance with well-known principles. The
controller/processor 225 could support additional functions as
well, such as more advanced wireless communication functions. For
instance, the controller/processor 225 could support beam forming
or directional routing operations in which outgoing signals from
multiple antennas 205a-205n are weighted differently to effectively
steer the outgoing signals in a desired direction. Any of a wide
variety of other functions could be supported in the eNB 102 by the
controller/processor 225.
[0068] The controller/processor 225 is also capable of executing
programs and other processes resident in the memory 230, such as an
OS. The controller/processor 225 can move data into or out of the
memory 230 as required by an executing process.
[0069] The controller/processor 225 is also coupled to the backhaul
or network interface 235. The backhaul or network interface 235
allows the eNB 102 to communicate with other devices or systems
over a backhaul connection or over a network. The interface 235
could support communications over any suitable wired or wireless
connection(s). For example, when the eNB 102 is implemented as part
of a cellular communication system (such as one supporting 5G, LTE,
or LTE-A), the interface 235 could allow the eNB 102 to communicate
with other eNBs over a wired or wireless backhaul connection. When
the eNB 102 is implemented as an access point, the interface 235
could allow the eNB 102 to communicate over a wired or wireless
local area network or over a wired or wireless connection to a
larger network (such as the Internet). The interface 235 includes
any suitable structure supporting communications over a wired or
wireless connection, such as an Ethernet or RF transceiver.
[0070] The memory 230 is coupled to the controller/processor 225.
Part of the memory 230 could include a RAM, and another part of the
memory 230 could include a Flash memory or other ROM.
[0071] Although FIG. 2 illustrates one example of eNB 102, various
changes may be made to FIG. 2. For example, the eNB 102 could
include any number of each component shown in FIG. 2. As a
particular example, an access point could include a number of
interfaces 235, and the controller/processor 225 could support
routing functions to route data between different network
addresses. As another particular example, while shown as including
a single instance of TX processing circuitry 215 and a single
instance of RX processing circuitry 220, the eNB 102 could include
multiple instances of each (such as one per RF transceiver). Also,
various components in FIG. 2 could be combined, further subdivided,
or omitted and additional components could be added according to
particular needs.
[0072] FIG. 3 illustrates an example UE 116 according to
embodiments of the present disclosure. The embodiment of the UE 116
illustrated in FIG. 3 is for illustration only, and the UEs 111-115
of FIG. 1 could have the same or similar configuration. However,
UEs come in a wide variety of configurations, and FIG. 3 does not
limit the scope of this disclosure to any particular implementation
of a UE.
[0073] As shown in FIG. 3, the UE 116 includes an antenna 305, a
radio frequency (RF) transceiver 310, TX processing circuitry 315,
a microphone 320, and receive (RX) processing circuitry 325. The UE
116 also includes a speaker 330, a processor 340, an input/output
(I/O) interface (IF) 345, a touchscreen 350, a display 355, and a
memory 360. The memory 360 includes an operating system (OS) 361
and one or more applications 362.
[0074] The RF transceiver 310 receives, from the antenna 305, an
incoming RF signal transmitted by an eNB of the network 100. The RF
transceiver 310 down-converts the incoming RF signal to generate an
intermediate frequency (IF) or baseband signal. The IF or baseband
signal is sent to the RX processing circuitry 325, which generates
a processed baseband signal by filtering, decoding, and/or
digitizing the baseband or IF signal. The RX processing circuitry
325 transmits the processed baseband signal to the speaker 330
(such as for voice data) or to the processor 340 for further
processing (such as for web browsing data).
[0075] The TX processing circuitry 315 receives analog or digital
voice data from the microphone 320 or other outgoing baseband data
(such as web data, e-mail, or interactive video game data) from the
processor 340. The TX processing circuitry 315 encodes,
multiplexes, and/or digitizes the outgoing baseband data to
generate a processed baseband or IF signal. The RF transceiver 310
receives the outgoing processed baseband or IF signal from the TX
processing circuitry 315 and up-converts the baseband or IF signal
to an RF signal that is transmitted via the antenna 305.
[0076] The processor 340 can include one or more processors or
other processing devices and execute the OS 361 stored in the
memory 360 in order to control the overall operation of the UE 116.
For example, the processor 340 could control the reception of
forward channel signals and the transmission of reverse channel
signals by the RF transceiver 310, the RX processing circuitry 325,
and the TX processing circuitry 315 in accordance with well-known
principles. In some embodiments, the processor 340 includes at
least one microprocessor or microcontroller.
[0077] The processor 340 is also capable of executing other
processes and programs resident in the memory 360, such as
processes for CSI reporting on PUCCH. The processor 340 can move
data into or out of the memory 360 as required by an executing
process. In some embodiments, the processor 340 is configured to
execute the applications 362 based on the OS 361 or in response to
signals received from eNBs or an operator. The processor 340 is
also coupled to the I/O interface 345, which provides the UE 116
with the ability to connect to other devices, such as laptop
computers and handheld computers. The I/O interface 345 is the
communication path between these accessories and the processor
340.
[0078] The processor 340 is also coupled to the touchscreen 350 and
the display 355. The operator of the UE 116 can use the touchscreen
350 to enter data into the UE 116. The display 355 may be a liquid
crystal display, light emitting diode display, or other display
capable of rendering text and/or at least limited graphics, such as
from web sites.
[0079] The memory 360 is coupled to the processor 340. Part of the
memory 360 could include a random access memory (RAM), and another
part of the memory 360 could include a Flash memory or other
read-only memory (ROM).
[0080] Although FIG. 3 illustrates one example of UE 116, various
changes may be made to FIG. 3. For example, various components in
FIG. 3 could be combined, further subdivided, or omitted and
additional components could be added according to particular needs.
As a particular example, the processor 340 could be divided into
multiple processors, such as one or more central processing units
(CPUs) and one or more graphics processing units (GPUs). Also,
while FIG. 3 illustrates the UE 116 configured as a mobile
telephone or smartphone, UEs could be configured to operate as
other types of mobile or stationary devices.
[0081] FIG. 4A is a high-level diagram of transmit path circuitry.
For example, the transmit path circuitry may be used for an
orthogonal frequency division multiple access (OFDMA)
communication. FIG. 4B is a high-level diagram of receive path
circuitry. For example, the receive path circuitry may be used for
an orthogonal frequency division multiple access (OFDMA)
communication. In FIGS. 4A and 4B, for downlink communication, the
transmit path circuitry may be implemented in a base station (eNB)
102 or a relay station, and the receive path circuitry may be
implemented in a user equipment (e.g. user equipment 116 of FIG.
1). In other examples, for uplink communication, the receive path
circuitry 450 may be implemented in a base station (e.g. eNB 102 of
FIG. 1) or a relay station, and the transmit path circuitry may be
implemented in a user equipment (e.g. user equipment 116 of FIG.
1).
[0082] Transmit path circuitry comprises channel coding and
modulation block 405, serial-to-parallel (S-to-P) block 410, Size N
Inverse Fast Fourier Transform (IFFT) block 415, parallel-to-serial
(P-to-S) block 420, add cyclic prefix block 425, and up-converter
(UC) 430. Receive path circuitry 450 comprises down-converter (DC)
455, remove cyclic prefix block 460, serial-to-parallel (S-to-P)
block 465, Size N Fast Fourier Transform (FFT) block 470,
parallel-to-serial (P-to-S) block 475, and channel decoding and
demodulation block 480.
[0083] At least some of the components in FIGS. 4A 400 and 4B 450
may be implemented in software, while other components may be
implemented by configurable hardware or a mixture of software and
configurable hardware. In particular, it is noted that the FFT
blocks and the IFFT blocks described in this disclosure document
may be implemented as configurable software algorithms, where the
value of Size N may be modified according to the
implementation.
[0084] Furthermore, although this disclosure is directed to an
embodiment that implements the Fast Fourier Transform and the
Inverse Fast Fourier Transform, this is by way of illustration only
and may not be construed to limit the scope of the disclosure. It
may be appreciated that in an alternate embodiment of the present
disclosure, the Fast Fourier Transform functions and the Inverse
Fast Fourier Transform functions may easily be replaced by discrete
Fourier transform (DFT) functions and inverse discrete Fourier
transform (IDFT) functions, respectively. It may be appreciated
that for DFT and IDFT functions, the value of the N variable may be
any integer number (i.e., 1, 4, 3, 4, etc.), while for FFT and IFFT
functions, the value of the N variable may be any integer number
that is a power of two (i.e., 1, 2, 4, 8, 16, etc.).
[0085] In transmit path circuitry 400, channel coding and
modulation block 405 receives a set of information bits, applies
coding (e.g., LDPC coding) and modulates (e.g., quadrature phase
shift keying (QPSK) or quadrature amplitude modulation (QAM)) the
input bits to produce a sequence of frequency-domain modulation
symbols. Serial-to-parallel block 410 converts (i.e.,
de-multiplexes) the serial modulated symbols to parallel data to
produce N parallel symbol streams where N is the IFFT/FFT size used
in BS 102 and UE 116. Size N IFFT block 415 then performs an IFFT
operation on the N parallel symbol streams to produce time-domain
output signals. Parallel-to-serial block 420 converts (i.e.,
multiplexes) the parallel time-domain output symbols from Size N
IFFT block 415 to produce a serial time-domain signal. Add cyclic
prefix block 425 then inserts a cyclic prefix to the time-domain
signal. Finally, up-converter 430 modulates (i.e., up-converts) the
output of add cyclic prefix block 425 to RF frequency for
transmission via a wireless channel. The signal may also be
filtered at baseband before conversion to RF frequency.
[0086] The transmitted RF signal arrives at UE 116 after passing
through the wireless channel, and reverse operations to those at
eNB 102 are performed. Down-converter 455 down-converts the
received signal to baseband frequency, and remove cyclic prefix
block 460 removes the cyclic prefix to produce the serial
time-domain baseband signal. Serial-to-parallel block 465 converts
the time-domain baseband signal to parallel time-domain signals.
Size N FFT block 470 then performs an FFT algorithm to produce N
parallel frequency-domain signals. Parallel-to-serial block 475
converts the parallel frequency-domain signals to a sequence of
modulated data symbols. Channel decoding and demodulation block 480
demodulates and then decodes the modulated symbols to recover the
original input data stream.
[0087] Each of eNBs 101-103 may implement a transmit path that is
analogous to transmitting in the downlink to user equipment 111-116
and may implement a receive path that is analogous to receiving in
the uplink from user equipment 111-116. Similarly, each one of user
equipment 111-116 may implement a transmit path corresponding to
the architecture for transmitting in the uplink to eNBs 101-103 and
may implement a receive path corresponding to the architecture for
receiving in the downlink from eNBs 101-103.
[0088] 5G communication system use cases have been identified and
described. Those use cases can be roughly categorized into three
different groups. In one example, enhanced mobile broadband (eMBB)
is determined to do with high bits/sec requirement, with less
stringent latency and reliability requirements. In another example,
ultra reliable and low latency (URLL) is determined with less
stringent bits/sec requirement. In yet another example, massive
machine type communication (mMTC) is determined that a number of
devices can be as many as 100,000 to 1 million per km2, but the
reliability/throughput/latency requirement could be less stringent.
This scenario may also involve power efficiency requirement as
well, in that the battery consumption should be minimized as
possible.
[0089] A communication system includes a Downlink (DL) that conveys
signals from transmission points such as Base Stations (BSs) or
NodeBs to User Equipments (UEs) and an Uplink (UL) that conveys
signals from UEs to reception points such as NodeBs. A UE, also
commonly referred to as a terminal or a mobile station, may be
fixed or mobile and may be a cellular phone, a personal computer
device, or an automated device. An eNodeB, which is generally a
fixed station, may also be referred to as an access point or other
equivalent terminology. For LTE systems, a NodeB is often referred
as an eNodeB.
[0090] In a communication system, such as LTE system, DL signals
can include data signals conveying information content, control
signals conveying DL control information (DCI), and reference
signals (RS) that are also known as pilot signals. An eNodeB
transmits data information through a physical DL shared channel
(PDSCH). An eNodeB transmits DCI through a physical DL control
channel (PDCCH) or an Enhanced PDCCH (EPDCCH).
[0091] An eNodeB transmits acknowledgement information in response
to data transport block (TB) transmission from a UE in a physical
hybrid ARQ indicator channel (PHICH). An eNodeB transmits one or
more of multiple types of RS including a UE-common RS (CRS), a
channel state information RS (CSI-RS), or a demodulation RS (DMRS).
A CRS is transmitted over a DL system bandwidth (BW) and can be
used by UEs to obtain a channel estimate to demodulate data or
control information or to perform measurements. To reduce CRS
overhead, an eNodeB may transmit a CSI-RS with a smaller density in
the time and/or frequency domain than a CRS. DMRS can be
transmitted only in the BW of a respective PDSCH or EPDCCH and a UE
can use the DMRS to demodulate data or control information in a
PDSCH or an EPDCCH, respectively. A transmission time interval for
DL channels is referred to as a subframe and can have, for example,
duration of 1 millisecond.
[0092] DL signals also include transmission of a logical channel
that carries system control information. A BCCH is mapped to either
a transport channel referred to as a broadcast channel (BCH) when
the DL signals convey a master information block (MIB) or to a DL
shared channel (DL-SCH) when the DL signals convey a System
Information Block (SIB). Most system information is included in
different SIBs that are transmitted using DL-SCH. A presence of
system information on a DL-SCH in a subframe can be indicated by a
transmission of a corresponding PDCCH conveying a codeword with a
cyclic redundancy check (CRC) scrambled with special system
information RNTI (SI-RNTI). Alternatively, scheduling information
for a SIB transmission can be provided in an earlier SIB and
scheduling information for the first SIB (SIB-1) can be provided by
the MIB.
[0093] DL resource allocation is performed in a unit of subframe
and a group of physical resource blocks (PRBs). A transmission BW
includes frequency resource units referred to as resource blocks
(RBs). Each RB includes N.sub.sc.sup.RB sub-carriers, or resource
elements (REs), such as 12 REs. A unit of one RB over one subframe
is referred to as a PRB. A UE can be allocated M.sub.PDSCH RBs for
a total of M.sub.sc.sup.PDSCH=M.sub.PDSCHN.sub.sc.sup.RB REs for
the PDSCH transmission BW.
[0094] UL signals can include data signals conveying data
information, control signals conveying UL control information
(UCI), and UL RS. UL RS includes DMRS and Sounding RS (SRS). A UE
transmits DMRS only in a BW of a respective PUSCH or PUCCH. An
eNodeB can use a DMRS to demodulate data signals or UCI signals. A
UE transmits SRS to provide an eNodeB with an UL CSI. A UE
transmits data information or UCI through a respective physical UL
shared channel (PUSCH) or a Physical UL control channel (PUCCH). If
a UE needs to transmit data information and UCI in a same UL
subframe, the UE may multiplex both in a PUSCH. UCI includes Hybrid
Automatic Repeat request acknowledgement (HARQ-ACK) information,
indicating correct (ACK) or incorrect (NACK) detection for a data
TB in a PDSCH or absence of a PDCCH detection (DTX), scheduling
request (SR) indicating whether a UE has data in the UE's buffer,
rank indicator (RI), and channel state information (CSI) enabling
an eNodeB to perform link adaptation for PDSCH transmissions to a
UE. HARQ-ACK information is also transmitted by a UE in response to
a detection of a PDCCH/EPDCCH indicating a release of
semi-persistently scheduled PDSCH.
[0095] An UL subframe includes two slots. Each slot includes
N.sub.symb.sup.UL symbols for transmitting data information, UCI,
DMRS, or SRS. A frequency resource unit of an UL system BW is a RB.
A UE is allocated N.sub.RB RBs for a total of
N.sub.RBN.sub.sc.sup.RB REs for a transmission BW. For a PUCCH,
N.sub.RB=1. A last subframe symbol can be used to multiplex SRS
transmissions from one or more UEs. A number of subframe symbols
that are available for data/UCI/DMRS transmission is N.sub.symb=2.
(N.sub.symb.sup.UL-1)-N.sub.SRS, where N.sub.SRS=1 if a last
subframe symbol is used to transmit SRS and N.sub.SRS=0
otherwise.
[0096] FIG. 5 illustrates a transmitter block diagram 500 for a
PDSCH in a subframe according to embodiments of the present
disclosure. The embodiment of the transmitter block diagram 500
illustrated in FIG. 5 is for illustration only. FIG. 5 does not
limit the scope of this disclosure to any particular implementation
of the transmitter block diagram 500.
[0097] As shown in FIG. 5, information bits 510 are encoded by
encoder 520, such as a turbo encoder, and modulated by modulator
530, for example using quadrature phase shift keying (QPSK)
modulation. A serial to parallel (S/P) converter 540 generates M
modulation symbols that are subsequently provided to a mapper 550
to be mapped to REs selected by a transmission BW selection unit
555 for an assigned PDSCH transmission BW, unit 560 applies an
Inverse fast Fourier transform (IFFT), the output is then
serialized by a parallel to serial (P/S) converter 570 to create a
time domain signal, filtering is applied by filter 580, and a
signal transmitted 590. Additional functionalities, such as data
scrambling, cyclic prefix insertion, time windowing, interleaving,
and others are well known in the art and are not shown for
brevity.
[0098] FIG. 6 illustrates a receiver block diagram 600 for a PDSCH
in a subframe according to embodiments of the present disclosure.
The embodiment of the diagram 600 illustrated in FIG. 6 is for
illustration only. FIG. 6 does not limit the scope of this
disclosure to any particular implementation of the diagram 600.
[0099] As shown in FIG. 6, a received signal 610 is filtered by
filter 620, REs 630 for an assigned reception BW are selected by BW
selector 635, unit 640 applies a fast Fourier transform (FFT), and
an output is serialized by a parallel-to-serial converter 650.
Subsequently, a demodulator 660 coherently demodulates data symbols
by applying a channel estimate obtained from a DMRS or a CRS (not
shown), and a decoder 670, such as a turbo decoder, decodes the
demodulated data to provide an estimate of the information data
bits 680. Additional functionalities such as time-windowing, cyclic
prefix removal, de-scrambling, channel estimation, and
de-interleaving are not shown for brevity.
[0100] FIG. 7 illustrates a transmitter block diagram 700 for a
PUSCH in a subframe according to embodiments of the present
disclosure. The embodiment of the block diagram 700 illustrated in
FIG. 7 is for illustration only. FIG. 7 does not limit the scope of
this disclosure to any particular implementation of the block
diagram 700.
[0101] As shown in FIG. 7, information data bits 710 are encoded by
encoder 720, such as a turbo encoder, and modulated by modulator
730. A discrete Fourier transform (DFT) unit 740 applies a DFT on
the modulated data bits, REs 750 corresponding to an assigned PUSCH
transmission BW are selected by transmission BW selection unit 755,
unit 760 applies an IFFT and, after a cyclic prefix insertion (not
shown), filtering is applied by filter 770 and a signal transmitted
780.
[0102] FIG. 8 illustrates a receiver block diagram 800 for a PUSCH
in a subframe according to embodiments of the present disclosure.
The embodiment of the block diagram 800 illustrated in FIG. 8 is
for illustration only. FIG. 8 does not limit the scope of this
disclosure to any particular implementation of the block diagram
800.
[0103] As shown in FIG. 8, a received signal 810 is filtered by
filter 820. Subsequently, after a cyclic prefix is removed (not
shown), unit 830 applies a FFT, REs 840 corresponding to an
assigned PUSCH reception BW are selected by a reception BW selector
845, unit 850 applies an inverse DFT (IDFT), a demodulator 860
coherently demodulates data symbols by applying a channel estimate
obtained from a DMRS (not shown), a decoder 870, such as a turbo
decoder, decodes the demodulated data to provide an estimate of the
information data bits 880.
[0104] In next generation cellular systems, various use cases are
envisioned beyond the capabilities of LTE system. Termed 5G or the
fifth generation cellular system, a system capable of operating at
sub-6 GHz and above-6 GHz (for example, in mmWave regime) becomes
one of the requirements. In 3GPP TR 22.891, 74 5G use cases has
been identified and described; those use cases can be roughly
categorized into three different groups. A first group is termed
`enhanced mobile broadband` (eMBB), targeted to high data rate
services with less stringent latency and reliability requirements.
A second group is termed "ultra-reliable and low latency (URLL)"
targeted for applications with less stringent data rate
requirements, but less tolerant to latency. A third group is termed
"massive MTC (mMTC)" targeted for large number of low-power device
connections such as 1 million per km.sup.2 with less stringent the
reliability, data rate, and latency requirements.
[0105] In order for the 5G network to support such diverse services
with different quality of services (QoS), one method has been
identified in LTE specification, called network slicing. To utilize
PHY resources efficiently and multiplex various slices (with
different resource allocation schemes, numerologies, and scheduling
strategies) in DL-SCH, a flexible and self-contained frame or
subframe design is utilized.
[0106] FIG. 9 illustrates an example multiplexing of two slices 900
according to embodiments of the present disclosure. The embodiment
of the multiplexing of two slices 900 illustrated in FIG. 9 is for
illustration only. FIG. 9 does not limit the scope of this
disclosure to any particular implementation of the multiplexing of
two slices 900.
[0107] Two exemplary instances of multiplexing two slices within a
common subframe or frame are depicted in FIG. 9. In these exemplary
embodiments, a slice can be composed of one or two transmission
instances where one transmission instance includes a control (CTRL)
component (e.g., 920a, 960a, 960b, 920b, or 960c) and a data
component (e.g., 930a, 970a, 970b, 930b, or 970c). In embodiment
910, the two slices are multiplexed in frequency domain whereas in
embodiment 950, the two slices are multiplexed in time domain.
These two slices can be transmitted with different sets of
numerology.
[0108] LTE specification supports up to 32 CSI-RS antenna ports
which enable an eNB to be equipped with a large number of antenna
elements (such as 64 or 128). In this case, a plurality of antenna
elements is mapped onto one CSI-RS port. For next generation
cellular systems such as 5G, the maximum number of CSI-RS ports can
either remain the same or increase.
[0109] FIG. 10 illustrates an example antenna blocks 1000 according
to embodiments of the present disclosure. The embodiment of the
antenna blocks 1000 illustrated in FIG. 10 is for illustration
only. FIG. 10 does not limit the scope of this disclosure to any
particular implementation of the antenna blocks 1000.
[0110] For mmWave bands, although the number of antenna elements
can be larger for a given form factor, the number of CSI-RS
ports--which can correspond to the number of digitally precoded
ports--tends to be limited due to hardware constraints (such as the
feasibility to install a large number of ADCs/DACs at mmWave
frequencies) as illustrated in FIG. 10. In this case, one CSI-RS
port is mapped onto a large number of antenna elements which can be
controlled by a bank of analog phase shifters. One CSI-RS port can
then correspond to one sub-array which produces a narrow analog
beam through analog beamforming. This analog beam can be configured
to sweep across a wider range of angles by varying the phase
shifter bank across symbols or subframes. The number of sub-arrays
(equal to the number of RF chains) is the same as the number of
CSI-RS ports N.sub.CSI-PORT. A digital beamforming unit performs a
linear combination across N.sub.CSI-PORT analog beams to further
increase precoding gain. While analog beams are wideband (hence not
frequency-selective), digital precoding can be varied across
frequency sub-bands or resource blocks. In LTE, depending on the
number of transmission layers, a maximum of two codewords are used
for DL and UL data transmissions (on DL data channel such as PDSCH
or PDCH, and UL data channel such as PUSCH or PUCH, respectively)
for spatial multiplexing. For L=1 layer, one codeword is mapped to
one layer. For L>1 layers, each of the two codewords is mapped
to at least one layer where L layers (rank-L) are divided almost
evenly across the two codewords. In addition, one codeword can also
be mapped to >1 layers especially when only one of the two
codewords is to be retransmitted.
[0111] Although beneficial for facilitating
modulation-and-coding-scheme (MCS) adaptation per codeword (CW) and
MMSE-SIC (MMSE with successive interference cancellation) receiver,
it costs some significant overhead over a single CW mapping. DL
overhead comes from the additional DCI payload due to 2 fixed MCS
fields and 2 fixed NDI-RV (DL HARQ related) fields. UL overhead
comes from the need for two CQIs (full 4-bit+delta 3-bit for
wideband CQI, and 2.times. overhead for subband CQI) for rank >1
and two DL HARQ-ACKs for rank >1. Added to that is the
complexity of having to accommodate more than one layer mapping
schemes in case of retransmission. Furthermore, when distributed
MIMO such as non-coherent joint transmission (NC-JT) is
incorporated into design requirements for 5G NR, the number of
codewords (CWs) used for DL and UL transmissions per UE can
increase with the number of TRPs. Therefore, using only one CW per
PDSCH/PUSCH assignment per UE is beneficial for NR, at least for up
to rank-2 transmission, or up to rank-4 transmission. Else, two-CW
per PDSCH/PUSCH assignment per UE can be used for higher ranks.
Alternatively, one CW per PDSCH/PUSCH assignment per UE can be used
for all ranks.
[0112] In addition, periodic CSI (P-CSI) reporting in LTE is
reported across multiple slots/Subframe/Slots. This results in
complex priority rules (due to dropping) and
inter-Subframe/Slot/slot dependencies which is unsuitable for TDD
and LAA (since the availability of UL Subframe/Slots/slots is
conditional). This mechanism is susceptible to error propagations
and stale CSI. The main reasons are: 1) PUCCH format 2 is too small
to carry one-shot CSI reporting, 2) RI-dependent CQI payload (due
to the use of maximum of 2 CWs), 3) RI-dependent PMI payload.
[0113] Yet another drawback of LTE design lies in separately
encoding RI (and CRI) from CQI and PMI. This is necessary since the
payload for CQI and PMI is rank-dependent. Since the payload for RI
is small and RI needs to be protected more compared to CQI and PMI
(to ensure correct decoding of CQI and PMI), RI is also mapped
differently from CQI and PMI. But even with such a strong
protection, there is no mechanism for the gNB to check whether RI
(and CRI) decoding is successful or not (due to the absence of
CRC).
[0114] Therefore, there is a need for a different design for CSI
and its associated uplink control information (UCI) multiplexing
schemes when a single codeword (CW) is mapped to all the L.gtoreq.1
transmission layers. The present disclosure includes several
components. Here, UCI includes reporting parameters associated with
CSI acquisition, such as CQI (channel quality indicator), PMI
(precoding matrix index), RI (rank indicator), and CRI (CSI-RS
resource index/indicator). Other CSI parameters can also be
included. Unless otherwise stated, this UCI does not include
HARQ-ACK. In the present disclosure, this UCI can also be referred
to as CSI-UCI for illustrative purposes.
[0115] All the following components and embodiments are applicable
for UL transmission with CP-OFDM (cyclic prefix OFDM) waveform as
well as DFT-SOFDM (DFT-spread OFDM) and SC-FDMA (single-carrier
FDMA) waveforms. Furthermore, all the following components and
embodiments are applicable for UL transmission when the scheduling
unit in time is either one Subframe/Slot (which can consist of one
or multiple slots) or one slot.
[0116] The aperiodic CSI (A-CSI) accommodates reporting with
different frequency granularities (one report for all the N.sub.SB
subbands in a configured CSI reporting band, or one report per
subband in a configured CSI reporting band) for CQI and PMI. RI and
CRI (and its associated CSI-RSRP(s)), however, are only reported
with one frequency granularity (one report for all the N.sub.SB
subbands in a configured CSI reporting band).
[0117] In addition, if single-CW layer mapping is used, CQI payload
is independent of RI value. PMI payload, however, can be dependent
on RI value. For example, for Type I (normal) CSI with lower
spatial resolution, PMI payload can be made RI-independent or less
dependent on RI value. For Type II (enhanced) CSI with higher
spatial resolution, PMI payload can be RI-dependent (for instance,
PMI payload can be proportional to RI value with per-layer
quantization/feedback). The following embodiments, however, can be
utilized whether single-CW layer mapping is used or not. For
example, they are also applicable for a layer mapping where the
maximum of 2 CWs are used (such as that used for LTE).
[0118] Component 1--Aperiodic CSI (A-CSI) Reporting in Two
Parts.
[0119] In one embodiment of the present disclosure (Scheme 1), the
CSI parameters included in PMI are partitioned into two parts: PMI
part I and PMI part II. When a UE is configured with RI reporting,
RI, CQI, and PMI part I are jointly encoded to form a codeword
segment 1. PMI part II is jointly encoded to form another codeword
segment 2.
[0120] For aperiodic CSI (A-CSI) reporting, a gNB allocates
resource (UL RBs) for UCI transmission (e.g. on PUSCH) without
knowing what the UE reports for RI. For Type II, the payload
difference between RI=1 and RI=2 is large, i.e., the payload for
RI=2 is approximately 2 times of that for RI=1. The resource
allocation is according to at least one of the following
schemes.
[0121] In scheme 1A, the PMI part I and PMI part II correspond to
the PMI for layer 1 and layer 2, respectively, and resource
allocation for the codeword segment 1 (which includes PMI part I)
and codeword segment 2 (which includes PMI part II) are in two
different slots (or subframes). When A-CSI reporting is triggered,
PUSCH resource is allocated according to RI=1 CSI payload size.
Depending on the RI value (included in codeword segment 1) reported
in the first CSI reporting instance, gNB determines whether to
trigger another A-CSI reporting for codeword segment 2. If
triggered, PUSCH resources could be allocated based on the received
CSI contents in the first CSI reporting instance.
[0122] In a variation of this scheme (1A-1), the resource
allocation for the codeword segment 2 (if RI=2 is reported in
codeword segment 1) is fixed. So, there is no need for additional
signaling for the resource location for codeword segment 2. For
example, the resource allocation (UL RBs) can be the same as that
for codeword segment 1, i.e. the same UL RBs in a different slot,
whose location is fixed with respect to the slot in which codeword
segment 1 is configured to be reported.
[0123] In another variation of this scheme (1A-2), the resource
allocation for the codeword segment 2 (if RI=2 is reported in
codeword segment 1) is configured (via DCI triggering or
signaling). For example, the resource allocation (UL RBs) can be
determined based on the beta offset (in LTE) with respect to the
resource allocation for codeword segment 1.
[0124] In scheme 1B, the PMI part I and PMI part II are configured
to be reported in a single slot or subframe according to at least
one of the following variations of scheme 1B. The term "configured
RI" or "to configure the value of RI" in these variations of scheme
1B (and elsewhere in the present disclosure) refers to at least one
of the two definitions (DEF1 and DEF2).
[0125] In some embodiments (DEF1), it means to force (restrict) the
UE to report the same RI value as that signaled to the UE. Or,
optionally, in this definition, the UE does not report RI since it
is the same as the configured RI value. In other embodiments
(DEF2), it signifies an assumed value of RI in relation to the
indicated resource allocation (RA) for UCI transmission which the
UE needs to know--but does not imply that the UE is restricted to
report the same RI value as that assumed in relation to the RA
(i.e., UE can report a different RI value from the assumed value).
Here, UCI includes CSI reporting which includes at least one of the
following: CRI, RI, PMI, and CQI.
[0126] In both DEF1 and DEF2, the RA for UCI transmission is
signaled to the UE in the form of a RA field in an UL-related (or,
optionally, DL-related) DCI which includes a CSI request field. The
"configured RI" is signaled to the UE via either higher-layer (such
as RRC) signaling, L2 signaling (such as MAC CE), or L1 signaling
(such as DCI). If signaled via L1 signaling, the "configured RI"
(signaled in the form of a DCI field, termed here for illustrative
purposes, the DCI field X) is either signaled together in the same
UL-related (or, optionally, DL-related) DCI which includes the RA
field, or signaled separately in another DCI. If signaled in the
same UL-related (or, optionally, DL-related) DCI as the RA field,
the DCI field X can be signaled either as a separate field from the
RA field or a part of the RA field. If signaled as a part of the RA
field, resource allocation definition for UCI transmission is
defined to include the "configured RI."
[0127] In one embodiment of Scheme 1B-0, the resource allocation
(RA) scheme or signaling for UL-related DCI is used for the purpose
of UCI transmission assuming a fixed value of RI if Type II CSI
reporting is configured regardless of the reported value of RI. For
example, the fixed value of RI for RA is RI=2.
[0128] In one embodiment of Scheme 1B-1, the resource allocation
(RA) scheme or signaling for UL-related DCI is used for the purpose
of UCI transmission. UE (and later gNB upon receiving the A-CSI
report) interprets the RA field differently depending on the value
of RI. The UE assumes a default RA=X PRBs which corresponds to a
fixed RI value. For example, when X PRBs correspond to RI=1, then
the UE assumes that the number of PRBs=K*X when RI=2, where K is a
constant.
[0129] In one example of Alt1.1, K is configurable either
semi-statically (via RRC, higher layer signaling), or more
dynamically (via MAC CE based or DCI signaling).
[0130] In one example of Alt1.2, K is pre-defined in the
specification, e.g. K=1.5, or 2.
[0131] In one example of Alt1.3, K is determined implicitly
depending on, e.g. frequency granularity ("wideband, or partial
band, or subband" or "one report for all subbands or one report per
subband") of CQI and/or PMI. TABLE 1 shows an example.
TABLE-US-00001 TABLE 1 K values Frequency granularity for PMI K
Wideband 1 Partial band 2 Subband 2
[0132] In one embodiment of Scheme 1B-2, in addition to the normal
bit allocation for UCI transmission, additional bit(s) is (are)
added in UL-related DCI to signal RA for both RI=1 and RI=2 if Type
II CSI reporting is configured. These additional bit(s) can be a
part of at least one of or a combination of RA field or CSI request
field, or other fields in the UL-related DCI. With these additional
bits, the UL-related DCI signaling is expanded to indicate two
hypotheses for two different RI values.
[0133] In one embodiment of Scheme 1B-3, the gNB triggers A-CSI for
a certain value of RI and configures the value of RI in the
UL-related DCI (or DL-related DCI). The RA is according to the CSI
(including PMI, CQI, and RI) reporting payload (number of bits)
corresponding to the configured value of RI. Note that in this case
even when the UE can support RI=2, the gNB may configure only RI=1
CSI. The UE reports RI and remaining CSI (including at least one of
CRI, PMI, and CQI) according to at least one of the following three
alternatives:
[0134] In one example of Alt1.4, a UE does not report RI and
reports the CSI (including at least one of CRI, PMI, and CQI)
corresponding to the configured value of RI. Here the definition of
"configured RI" is assumed to be according to DEF1.
[0135] In one example of Alt1.5, a UE reports RI, which can be
different from the RI configured by the gNB. For example, if the
configured value of RI=2, UE can report RI=1 or RI=2. Here the
definition of "configured RI" is assumed to be according to DEF2.
At least one of the following sub-alternatives is used for
remaining CSI reporting.
[0136] In one example of Alt 1.5a, the UE reports the remaining CSI
(including at least one of CRI, PMI, and CQI) according to the
assumed value of RI in relation to the indicated resource
allocation (RA) for UCI transmission.
[0137] In one example of Alt1.5b, the UE reports the remaining CSI
(including at least one of CRI, PMI, and CQI) according to the
reported value of RI.
[0138] If RI can take a value from {1, 2}, then a 1-bit field is
used in DCI to configure RI.
[0139] If RI can take a value from {1, 2, 3, 4}, then a 2-bit field
is used in DCI to configure RI.
[0140] Alternatively, if RI can take a value from {1, 2, 3, 4},
then a 1-bit field is used in DCI to configure either set S1={1} or
set S2={2, 3, 4} for RI for remaining CSI (PMI and CQI) reporting.
In this later alternative, the PMI reporting payload (number of
bits) for the RI value in set S1 is significantly differently (e.g.
2 times) from that in set S2. The PMI reporting payload (number of
bits) for RI values in set S2 is either the same or comparable.
[0141] The RA is according to the CSI reporting payload for the
configured set S1 or S2 for RI. Also, if the configured value of RI
equals set S1, then the UE either does not report RI (Alt 1.4) or
reports a 2-bit RI indicating values from {1, 2, 3, 4} (Alt 1.5).
And if the configured values of RI equals set S2, then the UE
reports a 3-bit RI indicating values from S={(1, 2), (1, 3), (1,
4), (2, 2), (3, 3), (4, 4)}, where a pair (a, b) in set S indicates
reported RI=a and reported remaining CSI (PMI and CQI)
corresponding to the configured RI=b.
[0142] In a variation of the aforementioned scheme, the value of RI
is configured semi-statically via higher layer RRC signaling or
more dynamic MAC CE based signaling.
[0143] In one embodiment of Scheme 1B-4, the gNB triggers A-CSI for
certain layer(s) and configures the value(s) of layer(s) in the
UL-related DCI (or DL-related DCI). The RA is according to the CSI
(including PMI, CQI, and RI) reporting payload (number of bits)
corresponding to the configured value(s) of layer(s). Note that in
this case even when the UE can support 2 layers (layer 0 and layer
1), the gNB may configure only one layer (layer 0 or layer 1) CSI.
The UE reports RI and remaining CSI (including at least one of CRI,
PMI, and CQI) according to at least one of the following three
alternatives.
[0144] In one example of Alt1.6, a UE does not report RI and
reports the CSI (including at least one of CRI, PMI, and CQI)
corresponding to the configured value(s) of layer(s). Here the
configured number of layers corresponds to "configured RI" and the
definition of "configured RI" is assumed to be according to
DEF1.
[0145] In one example of Alt1.7, a UE reports RI, which can be
different from the number of layer(s) configured by the gNB. For
example, if the configured value(s) of layer(s) is 2, UE can report
RI=1 or RI=2. Here the configured number of layers corresponds to
"configured RI" and the definition of "configured RI" is assumed to
be according to DEF2. At least one of the following
sub-alternatives is used for remaining CSI reporting.
[0146] In one example of Alt 1.7a, the UE reports the remaining CSI
(including at least one of CRI, PMI, and CQI) according to the
assumed value of RI (=configured number of layers) in relation to
the indicated resource allocation (RA) for UCI transmission.
[0147] In one example of Alt1.7b, the UE reports the remaining CSI
(including at least one of CRI, PMI, and CQI) according to the
reported value of RI.
[0148] If an RI can take a value from {1, 2}, then value(s) of
layer(s) is/are configured according to at least one of the
following alternatives: (Alt 1.8) a 1-bit field is used in DCI to
configure either layer 0 or layer 1; (Alt 1.9) a 1-bit field is
used in DCI to configure either layer 0 or both layer 0 and layer
1; and (Alt 1.10) a 2-bit field is used in DCI to configure either
layer 0 or layer 1 or both layer 0 and layer 1.
[0149] If an RI can take a value from {1, 2, 3, 4}, then value(s)
of layer(s) is/are configured according to at least one of the
following alternatives: (Alt 1.11) a 1-bit field is used in DCI to
configure either layer 0 or {layer 1, layer 2, layer 3}; (Alt 1.12)
a 2-bit field is used in DCI to configure either layer 0 or layer 1
or layer 2 or layer 3; (Alt 1.13) a 2-bit field is used in DCI to
configure either layer 0 or {layer 0, layer 1} or {layer 0, layer
1, layer 2} or {layer 0, layer 1, layer 2, layer 3}; and (Alt 1.14)
a 2-bit field is used in DCI to configure either layer 0 or layer 1
or {layer 0, layer 1} or {layer 2, layer 3}.
[0150] Alternatively, if an RI can take a value from {1, 2, 3, 4},
then a 1-bit field is used in DCI to configure either set S1={layer
0} or set S2={layer 1, layer 2, layer 3} for RI for (PMI and CQI).
In this later alternative, the PMI reporting payload (number of
bits) for the layer value in set S1 is significantly differently
(e.g. 2 times) from that in set S2. The PMI reporting payload
(number of bits) for layer values in set S2 is either the same or
comparable. The RA is according to the CSI reporting payload for
the configured set S1 or S2 for RI. Also, if the configured value
of layer equals S1, then the UE either does not report RI (Alt 1.6)
or reports a 2-bit RI indicating values from {1, 2, 3, 4} (Alt
1.7). And if the configured values of layers equal set S2, then the
UE reports a 3-bit RI indicating values from S={(1, 2), (1, 3), (1,
4), (2, 2), (3, 3), (4, 4)}, where a pair (a, b) in set S indicates
reported RI=a (indicating layer 0) and reported remaining CSI (PMI
and CQI) corresponding to the configured RI=b (indicating layer 1,
. . . , layer b-1).
[0151] In a variation of the aforementioned scheme, the value(s) of
layer(s) is/are configured semi-statically via higher layer RRC
signaling or more dynamic MAC CE based signaling.
[0152] In one embodiment of Scheme 1B-5, the gNB triggers A-CSI
with a certain RA size and configures the value of RA size in the
UL-related DCI (or DL-related DCI). The RA for CSI (including PMI,
CQI, and RI) reporting is according to the configured value of RA
size. Note that the UE can report A-CSI that requires two different
RA sizes for RI=1 and RI=2, but the gNB can configure RA size for
RI=1 CSI. The UE reports RI and remaining CSI (including at least
one of CRI, PMI, and CQI) according to at least one of the
following three alternatives.
[0153] In one example of Alt1.15, a UE does not report RI and
reports the CSI (including at least one of CRI, PMI, and CQI)
corresponding to RI associated with the configured value of RA
size. Here the configured RA size corresponds to "configured RI"
and the definition of "configured RI" is assumed to be according to
DEF1.
[0154] In one example of Alt1.16, a UE reports RI, which can be
different from the RI corresponding to the configured value of RA
size by the gNB. For example, if the configured value of RA size
correspond to RI=2, UE can report RI=1 or RI=2. Here the configured
RA size corresponds to "configured RI" and the definition of
"configured RI" is assumed to be according to DEF2. At least one of
the following sub-alternatives is used for remaining CSI
reporting.
[0155] In one example of Alt 1.16a, the UE reports the remaining
CSI (including at least one of CRI, PMI, and CQI) according to the
assumed value of RI (corresponds to the configured RA size) in
relation to the indicated resource allocation (RA) for UCI
transmission.
[0156] In one example of Alt1.16b, the UE reports the remaining CSI
(including at least one of CRI, PMI, and CQI) according to the
reported value of RI.
[0157] If RA size can take a value from {1, 2} that one-to-one
corresponds to RI value in {1, 2}, then a 1-bit field is used in
DCI to configure RA size 1 or 2 corresponding to RI=1 or RI=2
respectively.
[0158] If RA size can take a value from {1, 2, 3, 4} that
one-to-one corresponds to RI value in {1, 2, 3, 4}, then a 2-bit
field is used in DCI to configure RA size 1, 2, 3, or 2
corresponding to RI=1, 2, 3, or 4 respectively.
[0159] Alternatively, if RA size can take a value from {1, 2} that
one-to-one corresponds to RI value in two sets, e.g. S1={1} and
S2={2, 3, 4} for RI for remaining CSI (PMI and CQI) reporting, then
a 1-bit field is used in DCI to configure RA size 1 or 2
corresponding to RI in set S1 or RI in set S2, respectively. In
this later alternative, the PMI reporting payload (number of bits)
for the RI value in set S1 is significantly differently (e.g. 2
times) from that in set S2. The PMI reporting payload (number of
bits) for RI values in set S2 is either the same or comparable.
[0160] The RA is according to the CSI reporting payload for the
configured set S1 or S2 for RI. Also, if the configured value of RA
size=1 that corresponds to RI=S1, then the UE either does not
report RI (Alt 1.15) or reports a 2-bit RI indicating values from
{1, 2, 3, 4} (Alt 1.16). And if the configured values of RA size=2
that corresponds to RI=S2, then the UE reports a 3-bit RI
indicating values from S={(1, 2), (1, 3), (1, 4), (2, 2), (3, 3),
(4, 4)}, where a pair (a, b) in set S indicates reported RI=a and
reported remaining CSI (PMI and CQI) corresponding to the
configured RI=b.
[0161] In a variation of this scheme, the value of RI is configured
semi-statically via higher layer RRC signaling or more dynamic MAC
CE based signaling.
[0162] In one embodiment of Scheme 1B-6, Scheme 1B-4 in which layer
numbers layer 0, layers 1 . . . and so on are replaced with their
RA size numbers RA size 0, RA size 1 . . . and so on.
[0163] In one embodiment of Scheme 1B-7, the UE interprets the
modulation and coding scheme (MCS) field in UL-related DCI for the
purpose of UCI transmission differently depending on the value of
RI reported by the UE. There is no additional gNB signaling
involved, and RA for UCI transmission is fixed regardless of the
reported RI value.
[0164] The UE interprets the configured MCS field as MCS value=X
for one RI value (e.g. RI=1) and as MCS value=Y for another RI
value (e.g. RI=2), where the value Y is such that at least one of
modulation and coding rate is different from that corresponding to
MCS value=X. For example, the MCS value=X corresponds to RI=1, and
the MCS value Y=K*X corresponds to RI=2, where K is a constant. At
least one of the following alternatives is used for K.
[0165] In one example of Alt1.17, K is configurable either
semi-statically (via RRC, higher layer signaling), or more
dynamically (via MAC CE based or DCI signaling). This configuration
is either explicit via a RRC parameter signaling the value of K, or
implicit via at least one of the Type II CSI codebook parameters
such as parameter to set the value for L, resolution for phase
reporting, and SB amplitude reporting.
[0166] In one example of Alt1.18, K is pre-defined in the
specification, e.g. K=1/2, or 1/3.
[0167] In one example of Alt1.19, K is determined implicitly
depending on, e.g. frequency granularity ("wideband, or partial
band, or subband" or "one report for all subbands or one report per
subband") of CQI and/or PMI. TABLE 2 shows an example.
TABLE-US-00002 TABLE 2 K values Frequency granularity for PMI K
Wideband 1 Partial band 1 Subband 1/2
[0168] For example, the MCS value=X corresponds to RI=1, and the
MCS value Y=X-K corresponds to RI=2, where K is a constant. At
least one of the following alternatives is used for K.
[0169] In one example of Alt1.20, K is configurable either
semi-statically (via RRC, higher layer signaling), or more
dynamically (via MAC CE based or DCI signaling). This configuration
is either explicit via a RRC parameter signaling the value of K, or
implicit via at least one of the Type II CSI codebook parameters
such as parameter to set the value for L, resolution for phase
reporting, and SB amplitude reporting.
[0170] In one exempla of Alt1.21, K is pre-defined in the
specification, e.g. K=.left brkt-bot.X/2.right brkt-bot., or .left
brkt-bot.X/3.right brkt-bot..
[0171] In one example of Alt1.22, K is determined implicitly
depending on, e.g. frequency granularity ("wideband, or partial
band, or subband" or "one report for all subbands or one report per
subband") of CQI and/or PMI. TABLE 3 shows an example.
TABLE-US-00003 TABLE 3 K values Frequency granularity for PMI K
Wideband 1 Partial band 1 Subband .left brkt-bot.X/2.right
brkt-bot.
[0172] In one embodiment of Scheme 1B-8, the UE (and later gNB upon
receiving the A-CSI report) interprets both MCS field and RA field
in UL-related DCI for the purpose of UCI transmission differently
depending on the value of RI reported by the UE. There is no
additional gNB signaling involved. The UE interprets the configured
MCS field as MCS value=X and RA=M PRBs for one RI value (e.g. RI=1)
and as MCS value=Y and RA=N PRBs for another RI value (e.g. RI=2),
where the value Y is such that at least one of modulation and
coding rate is different from that corresponding to MCS value=X.
For example, the MCS value=X and RA=M PRBs correspond to RI=1, and
the MCS value Y=K1*X (or =X-K1) and RA=K2*N PRBs correspond to
RI=2, where K1 and K2 are constant. The value K1 is according to at
least one of alternatives in Scheme 1B-8 and the value K2 is
according to at least one of alternatives in Scheme 1B-1.
[0173] In one embodiment of Scheme 1B-9, the UE performs rate
matching (RM) to the UCI. Based on the indicated RA or/and MCS, RM
is performed on the second part if the UCI payload is smaller or
exceeds that accommodated by the indicated RA/MCS. Note that in
this case, the condition to address different payloads for RI=1 and
RI=2 is not based on RI (configured or reported), but based on the
total UCI payload. At least one of the following two alternatives
for RM is used.
[0174] In one example of Alt1.23, RM is performed using typical
channel coding procedure (for, e.g. polar code), i.e. puncturing
the parity bits first, and if needed, systematic bits later.
[0175] In one example of Alt1.24, RM is performed by puncturing
some UCI bits based on a certain ordering, e.g. PMI first, then
CQI.
[0176] Note that the gNB can infer the payload size (hence no blind
detection is needed) doe the second part after decoding the first
part.
[0177] In some embodiments on Type II CSI reporting, the PMI
comprises a first (WB) PMI i.sub.1 and a second (SB) PMI i.sub.2.
The first PMI i.sub.1=[i.sub.1,1, i.sub.1,2, i.sub.1,3, i.sub.1,4]
comprises two layer-common (i.e., reported common for two layers if
a UE reports RI=2) components: orthogonal basis set (indicated
using index i.sub.1,1 indicating the rotation factors (q.sub.1,
q.sub.2) where q.sub.1, q.sub.2.di-elect cons.{(0,1,2,3}); and L
beam selection (indicated using index i.sub.1,2), which is either
joint, .left brkt-top.log.sub.2.sup.N.sup.1.sub.L.sup.N.sup.2.right
brkt-bot. bits, or independent per beam, L.left
brkt-top.log.sub.2(N.sub.1N.sub.2).right brkt-bot. bits, and two
layer-specific (i.e., reported for each of the two layers if UE
reports RI=2) components: strongest coefficient (indicated using
index i.sub.1,3) and WB amplitudes p.sub.l,i.sup.(1) (indicated
using index i.sub.1,4).
[0178] The indices i.sub.1,3 and i.sub.1,4 can be expressed further
as
i 1 , 3 = { [ i 1 , 3 , 1 ] RI = 1 [ i 1 , 3 , 1 i 1 , 3 , 2 ] RI =
2 and i 1 , 4 = { [ i 1 , 4 , 1 ] RI = 1 [ i 1 , 4 , 1 i 1 , 4 , 2
] RI = 2 . ##EQU00001##
The second PMI i.sub.2=[i.sub.2,1, i.sub.2,2] comprises two
layer-specific components: SB phase c.sub.l,i indicated using index
i.sub.2,1 and SB amplitude p.sub.l,i.sup.(2) (which can be turned
ON or OFF by RRC signaling) indicated using index i.sub.2,2, which
can expressed as
i 2 , 1 = { [ i 2 , 1 , 1 ] RI = 1 [ i 2 , 1 , 1 i 2 , 1 , 2 ] RI =
2 and i 2 , 2 = { [ i 2 , 2 , 1 ] RI = 1 [ i 2 , 2 , 1 i 2 , 2 , 2
] RI = 2 . ##EQU00002##
Note that i.sub.1,3,2, i.sub.1,4,2, i.sub.2,1,2, and i.sub.2,1,2
are reported only when RI=2 is reported. The subscript l.di-elect
cons.{0,1} is used for layers, and the subscript i.di-elect
cons.{0, 1, . . . , 2L-1} is used for coefficients. The first PMI
is reported in a wideband (WB) manner and the second PMI can be
reported in a wideband or subband (SB) manner.
[0179] FIG. 11 illustrates an example two-part UCI design 1100
according to embodiments of the present disclosure. The embodiment
of the two-part UCI design 1100 illustrated in FIG. 11 is for
illustration only. FIG. 11 does not limit the scope of this
disclosure to any particular implementation. As shown in FIG. 11,
RI, CQI, and I are combined as Part 1 (e.g., UCI part 1) in step
1105. Wideband PMI (i1) and subband PMI (i2) are combined as Part 2
(e.g., UCI part 2) in step 1110. In step 1115, the number of bits
(P1) in Part 1 and the number of bits (P2) in Part 2 are added to
each other. In step 1120, a total number of bits (P=P1+P2) is
compared with a number of bits B. If P is greater than B, the UCI
part 1 is only transmitted, otherwise, the UCI part 1 and 2 are
transmitted.
[0180] In one embodiment of scheme 1B-10, an example of which is
illustrated in FIG. 11, for the two-part UCI design where the first
part includes information such as RI, CQI, and, optionally, an
indicator (1) about the WB amplitudes, if the UE finds that the
total CSI payload P (the number of UCI information bits associated
with the CSI report) exceeds the number of bits (B) that can be
accommodated within the PUSCH resources for UCI transmission
(either explicitly or implicitly allocated to the UE) or,
optionally, exceeds a certain threshold (either fixed or
configured), the UE transmits only the first UCI part and not the
second UCI part; otherwise the UE transmits both parts. The
indicator (1) is according to at least one of the following
alternatives.
[0181] In one example of Alt 1B-10a, (N.sub.0,1, N.sub.0,2), where
N.sub.0,1 and N.sub.0,2 respectively indicate the number of
reported WB amplitudes that are zero for layer 1 and layer 2
respectively, i.e., p.sub.l,i.sup.(1)=0; if RI=1, N.sub.0,2 is set
to fixed value (e.g. 0 or 2L), since PMI for layer 2 is not
reported.
[0182] In one example of Alt 1B-10b, (N.sub.0,1, N.sub.0,2), where
N.sub.0,1 and N.sub.0,2 respectively indicate the number of
reported WB amplitudes that are non-zero for layer 1 and layer 2
respectively, i.e., p.sub.l,i.sup.(1).noteq.0; if RI=1, N.sub.0,2
is set to fixed value (e.g. 0 or 2L), since PMI for layer 2 is not
reported.
[0183] In one example of Alt 1B-10c, N.sub.0 to indicate the total
(sum) number of reported WB amplitudes that are zero, where the
total or sum is across all layers.
[0184] In one example of Alt 1B-10d, N.sub.0 to indicate the total
(sum) number of reported WB amplitudes that are non-zero, where the
total or sum is across all layers.
[0185] In one example of Alt 1B-10e, B=B.sub.0B.sub.1 or
B.sub.1B.sub.0, where each of bitmap B.sub.0=b.sub.0,0b.sub.0,1 . .
. b.sub.0,2L-1 and bitmap B.sub.1=b.sub.1,0b.sub.1,1 . . . ,
b.sub.1,2L-1 is of length 2L. If a bit b.sub.i,j=0, then the
corresponding WB amplitude is zero, and if a bit b.sub.i,j=1, then
the corresponding WB amplitude is non-zero. Alternatively, if a bit
b.sub.i,j=0, then the corresponding WB amplitude is non-zero, and
if a bit b.sub.i,j=1, then the corresponding WB amplitude is zero;
if RI=1, B.sub.1 is fixed (e.g. 00 . . . 0), since PMI for layer 2
is not reported.
[0186] In a variation of scheme 1B-10, the first part does not
include RI, and comprises CQI and the indicator I. RI is not
reported explicitly, but derived using the indicator I.
[0187] FIG. 12A illustrates another example two-part UCI design
1200 according to embodiments of the present disclosure. The
embodiment of the two-part UCI design 1200 illustrated in FIG. 12A
is for illustration only. FIG. 12A does not limit the scope of this
disclosure to any particular implementation. As shown in FIG. 12A,
RI, CQI, and I are combined as Part 1 (e.g., UCI part 1) in step
1205. Wideband PMI (i1) and subband PMI (i2) are combined as Part 2
(e.g., UCI part 2) in step 1206. In step 1207, the number of bits
(P1) in Part 1 and the number of bits (P2) in Part 2 are added to
each other. In step 1208, a total number of bits (P=P1+P2) is
compared with a number of bits B. If P is greater than B, the UCI
part 1 and a UCI part 2 after rate matching are transmitted,
otherwise, the UCI part 1 and 2 are transmitted. In step 1209, a
rate matching operation is performed for the UCI part 2 based on
information from the UCI part 2 in step 1206.
[0188] In one embodiment of scheme 1B-11, an example of which is
illustrated in FIG. 8, for two-part UCI design where the first part
includes information such as RI, CQI, and, optionally, an indicator
(1), if the UE finds that the total CSI payload (the number of UCI
information bits associated with the CSI report) exceeds the number
of bits that can be accommodated within the PUSCH resources for UCI
transmission (either explicitly or implicitly allocated to the UE)
or, optionally, exceeds a certain threshold (either fixed or
configured), the UE transmits the first UCI part as is.
[0189] In addition, the UE performs rate matching to the second UCI
part. This can be done, for instance, by increasing the channel
coding rate, or partially puncturing or selecting the output of the
channel encoder (e.g. Polar encoder), or by adjusting the
modulation-coding-scheme (MCS) and/or beta offset factor used by
the second UCI part. This rate matching can include no transmission
(complete puncturing) as a special case, if the payload associated
with the second UCI part is too large compared to a certain
threshold. The indicator (1) is according to at least one of the
alternatives in the aforementioned Scheme 1B-10.
[0190] In a variation of scheme 1B-11, the first part does not
include RI, and comprises CQI and the indicator I. RI is not
reported explicitly, but derived using the indicator I.
[0191] In one embodiment of scheme 1B-12, an A-CSI report is
encoded separately into multiple encoded parts in a single-slot and
the transmission priority of each encoded part is different.
[0192] In one example, the encoded parts that are used to identify
the number of information bits in other encoded parts of the report
have higher transmission priority.
[0193] In one example, the higher priority parts are first included
in a transmission in their entirety before the lower priority parts
are included.
[0194] In one example, the information bits and/or channel coded
bits (with or without rate matching as explained in Scheme 1B-11)
of a lower priority part is partially transmitted or not
transmitted if the payload (the number bits associated with the
lower priority part) exceeds the number of bits that can be
accommodated (after the payload for the higher priority parts is
subtracted out from the maximum that UCI can accommodate) within
the PUSCH resources for UCI transmission (either explicitly or
implicitly allocated to the UE). If the lower priority part is
partially transmitted, then at least one of the following
alternatives is used.
[0195] In one example of Alt 1B-12a, the CSI components or
parameters corresponding to at least one subband (SB) is dropped
(not transmitted) for the lower priority parts. The CSI for all SBs
can be dropped as a special case. At least one of the following
methods is used.
[0196] In one instance of Method 0, a decimation ratio (r) is used;
starting from SB number 0, the CSI components or parameters
corresponding to SB number r, SB number 2r, and so on are reported
for the lower priority parts. The decimation factor is either fixed
(e.g. 2), or configured (via RRC or MAC CE based or dynamic DCI
based signaling).
[0197] In one instance of Method 1, a priority pattern is used to
order SB CSI for lower priority parts. The pattern is either fixed
(e.g. 2), or configured (via RRC or MAC CE based or dynamic DCI
based signaling).
[0198] In one instance of Method 2, a UE reports the set (indices)
of SBs for which the CSI is reported for the lower priority parts,
and this reporting is either in the higher priority parts or in the
lower priority parts. To report the SB indices, the combinatorial
numbering as provided in 2017.08.003.SR0 can be used where the
reported SB combination index is given by
i = j = 0 M - 1 ( K - 1 - k j M - j ) , ##EQU00003##
where K is the total number of SBs for which the UE is configured
to report CSI, M is the number of SBs for which lower priority
parts are transmitted partially, and k.sub.0, k.sub.1, . . .
k.sub.M-1 are the indices of M selected SBs sorted in increasing
order of i.
[0199] Alternatively, the SB indices are reported using a bitmap
B=b.sub.0, b.sub.1, . . . , b.sub.K-1, where b.sub.i=0 indicates
that the SB i is not selected for partial CSI reporting, and
b.sub.i=1 indicates that the SB i is selected for partial CSI
reporting, or, b.sub.i=1 indicates that the SB i is not selected
for partial CSI reporting, and b.sub.i=0 indicates that the SB i is
selected for partial CSI reporting. In this bitmap, b.sub.0
corresponds to the least significant bit (LSB) and b.sub.K-1
corresponds to the most significant bit (MSB). Alternatively,
b.sub.0 corresponds to the MSB and b.sub.K-1 corresponds to the
LSB.
[0200] In one example of Alt 1B-12b, a subset of CSI components or
parameters is dropped (not reported) for all SBs for which the UE
is configured to report the lower priority parts. The subset is
either fixed or configured (via RRC or MAC CE based or dynamic DCI
based signaling) or reported by the UE (e.g. in the higher priority
parts).
[0201] In one example of Alt 1B-12c, a combination of Alt 1B-12a
and Alt 1B-12b, wherein a subset of CSI components or parameters is
dropped (not reported) for at least one SB for which the UE is
configured to report the lower priority parts. The subset or/and
the at least one SB is/are either fixed or configured (via RRC or
MAC CE based or dynamic DCI based signaling).
[0202] In one example of Alt 1B-12d, the CSI reported in the higher
priority parts is used to determine the partial transmission of the
lower priority parts.
[0203] In one instance, if the higher priority part includes CQI,
then the indices of the SBs for which the UE is configured to
report CSI are sorted in the decreasing (or increasing) order of
the CQIs, and the lower priority parts are transmitted only for the
best M SBs which correspond to the M largest CQI values that are
reported in the higher priority parts. The value M is either fixed
(e.g. M=.left brkt-bot.K/2.right brkt-bot. or .left
brkt-top.K/2.right brkt-bot. where K is the total number of SBs for
which the UE is configured to report CSI) or configured (e.g. via
higher layer RRC signaling) or is determined based on the UCI
related information such as RA or/and MCS.
[0204] When the CQIs, CQI.sub.x and CQI.sub.y, of the two SBs, x
and y are identical (CQI.sub.x=CQI.sub.y), then the SB with index
min(x, y) or max(x, y) is prioritized to be included in the set of
the best M SBs.
[0205] In another instance, if the higher priority part includes
(N.sub.0,1, N.sub.0,2), where N.sub.0,1 and N.sub.0,2 as defined in
Alt 1B-10b, respectively indicate the number of reported WB
amplitudes that are non-zero for layer 1 and layer 2 respectively,
and gNB configures RA for UCI transmission assuming RI=1, which
corresponds to M coefficients (SB phase and if configured SB
amplitude) reporting in each SB, but the UE wants to report RI=2,
then the UE reports M strongest coefficients from the total
coefficients across both layers and drops (does not report) the
remaining weak coefficients (where the strongest coefficients are
determined based on the reported WB amplitude values for both
layers). The number M is divided into two numbers (positive
integers), M.sub.1 for layer 1 and M.sub.2 for layer 2 such that
M.sub.1+M.sub.2=M. If N.sub.0,1 and N.sub.0,2 do not include the
strongest coefficients (which are 1) for layer 1 and layer 2, and
N.sub.0,1+N.sub.0,2>M, then the weak coefficients are dropped as
follows: Layer 1: K.sub.1=M-N.sub.0,2; report max(M.sub.1, K.sub.1)
strongest coefficients and drop the rest; and Layer 2:
K.sub.2=M-N.sub.0,1; report max(M.sub.2, K.sub.2) strongest
coefficients and drop the rest
[0206] If N.sub.0,1 and N.sub.0,2 include the strongest
coefficients (which are always 1) for layer 1 and layer 2, and No,
+N.sub.0,2-2>M, then the weak coefficients are dropped as
follows: Layer 1: K.sub.1=M-N.sub.0,2+1; report max(M.sub.1,
K.sub.1) strongest coefficients and drop the rest; and Layer 2:
K.sub.2=M-N.sub.0,1+1; report max(M.sub.2, K.sub.2) strongest
coefficients and drop the rest.
[0207] In an example, M=2L-1, and either M.sub.1=L and M.sub.2=L-1,
or, M.sub.1=L-1 and M.sub.2=L. This example can be extended to
other alternatives, e.g. Alt 1B-10a, Alt 1B-10c, Alt 1B-10d, and
Alt 1B-10e.
[0208] In another example, which is an extension of the previous
example, if the higher priority part includes (N.sub.0,1,
N.sub.0,2), and gNB configures RA for UCI transmission assuming
RI=1, which corresponds to M coefficients (SB phase and if
configured SB amplitude) reporting in each SB, but the UE wants to
report RI=2, then the UE reports M strongest coefficients from the
total coefficients across both layers and drops (does not report)
the remaining weak coefficients (where the strongest coefficients
are determined based on the reported WB amplitude values across
both layers). The information about the M out of all coefficients
for both layers is signaled either implicitly based on the reported
WB amplitude values for two layers, or explicitly in the higher
priority parts.
[0209] FIG. 12B illustrates yet another example two-part UCI design
1220 according to embodiments of the present disclosure. The
embodiment of the two-part UCI design 1220 illustrated in FIG. 12B
is for illustration only. FIG. 12B does not limit the scope of this
disclosure to any particular implementation. As shown in FIG. 12B,
RI, CQI, and I are combined as Part 1 (e.g., UCI part 1) in step
1221. Wideband PMI (i1) and subband PMI (i2) are combined as Part 2
(e.g., UCI part 2) in step 1223. In step 1225, the number of bits
(P1) in Part 1 and the number of bits (P2) in Part 2 are added to
each other. In step 1227, a total number of bits (P=P1+P2) is
compared with a number of bits B. If P is greater than B, the UCI
part 1 and a partial CSI for the UCI Part 2 are transmitted,
otherwise, the UCI part 1 and 2 are transmitted. In step 1209, the
partial CSI for the UCI part 2 is determined based on information
from the UCI part 2 in step 1223.
[0210] As an example, as shown in FIG. 12B, the multiple encoded
parts correspond to two parts, part 1 and part 2 (or first part or
second part) where part 1 corresponds to the higher priority part
and part 2 corresponds to the lower priority part. The CSI content
of two parts is according to Scheme 1B-10 or 1B-11, including the
variation wherein the first part does not include RI, and comprises
CQI and the indicator I; RI is not reported explicitly, but derived
using the indicator I. The lower priority part (part 2) is
transmitted in full (i.e. all CSI components are transmitted for
all SBs) when RI=1 is transmitted in the higher priority part (part
1), and can be transmitted partially (according to at least one of
Alt 1B-12a, 12b, 12c, or 12d) or not transmitted when RI=2 is
transmitted in the higher priority part (part 1).
[0211] The CQI reporting in the higher priority part (part 1) is
according to at least one of the following alternatives.
[0212] In one example of Alt 1B-12X, the CQI transmission is
unaffected (independent) by whether the lower priority part (part
2) is transmitted in full or partially or not transmitted.
[0213] In one example of Alt 1B-12Y, the CQI transmission depends
on the lower priority part (part 2). For example, when the part 2
is transmitted partially (according to at least one of Alt 1B-12a,
12b, 12c, or 12d), the CQI is also transmitted partially depending
on the alternative for partial part 2 transmission. In such
example, when Alt 1B-12a is used for partial part 2 transmission,
the CQI is transmitted only for the SBs for which part 2 CSI is
transmitted. In such example, when Alt 1B-12b is used for partial
part 2 transmission, the CQI is transmitted for all SBs according
to the set of part 2 CSI parameters/components that are
transmitted.
[0214] The information whether the lower priority parts (e.g. part
2) are reported (A) fully for all SBs or (B) partially for a subset
of SBs or (C) dropped (not reported) for all SBs is determined
according to at least one of the following alternatives.
[0215] In one alternative, the information whether the lower
priority parts (e.g. part 2) are reported according to (A), or (B),
or (C) is determined based on a predefined condition, and hence
does not require any additional configuration/reporting.
[0216] In one example, the predefined condition can be based on the
UCI related information (e.g. RA or/and MCS) in the DL-related DCI
(or UL-relayed DCI). For instance, if RA assumes RI=1, then if the
UE wants to report RI=1, then the lower priority parts are reported
fully, and if the UE wants to report RI=2, then the lower priority
parts are reported partially or dropped.
[0217] In another example, if the number of UCI symbols exceeds the
number of available symbols given in the RA (or exceeds a
particular fraction of the number of available symbols given in the
RA), then (B) partial transmission is performed, otherwise (A) full
transmission is performed.
[0218] In such example, the fraction can be fixed (predefined) or
configured (from a set of values) via either higher layer RRC or
dynamic DCI based signaling.
[0219] In such example, the number of UCI symbols is determined
from the MCS (indicated in the UL-related DCI) and beta offset
(either indicated in the UL-related DCI or configured via
higher-layer signaling). For example, at least when CSI is
multiplexed with UL-SCH on PUSCH: lower priority (part 2)
information bits are transmitted fully (A) if UCI code rate is
below threshold c.sub.T; lower priority (part 2) information bits
are transmitted partially (e.g. lower priority bits are omitted for
a subset of SBs as explained in some embodiments of the present
disclosure) until UCI code rate is below c.sub.T; and an example of
threshold is
c T = c MCS .beta. offset CSI - 2 , ##EQU00004##
where c.sub.MCS is the code rate for PUSCH given from the MCS field
for CSI part 2, and .beta..sub.offset.sup.CSI-2 is the associated
beta offset for CSI part 2.
[0220] In another example, if the number of UCI symbols exceeds the
number of available symbols given in the RA (or exceeds a
particular fraction of the number of available symbols given in the
RA), then (C) the lower priority parts are dropped, otherwise (A)
full transmission is performed.
[0221] In another alternative, the information whether the lower
priority parts (e.g. part 2) are reported according to (A), or (B),
or (C) is indicated/configured via DL-related DCI (or UL-relayed
DCI).
[0222] In one example, this indication is based on a 1-bit DCI
field which indicates (A) full reporting or (B) partial
reporting.
[0223] In another example, this indication is based on a 1-bit DCI
field which indicates (A) full reporting or (C) dropping.
[0224] In yet another example, this indication is based on a 1-bit
DCI field which indicates (B) partial reporting or (C) dropping
[0225] In yet another example, this indication is based on a 2-bit
DCI field which indicates (A) full reporting or (B) partial
reporting or (C) dropping.
[0226] In yet another example, this indication is based on a 2-bit
DCI field which indicates (A) full reporting or (B1) partial
reporting 1 or (B2) partial reporting 2 or (C) dropping, where (B1)
partial reporting 1 corresponds to the case in which the lower
priority parts are reported partially for a subset S1 of SBs, and
where (B2) partial reporting 2 corresponds to the case in which the
lower priority parts are reported partially for a subset S2 of SBs,
and S1 and S2 differ in at least one SB.
[0227] In another alternative, the information whether the lower
priority parts (e.g. part 2) are reported according to (A), or (B),
or (C) is reported by the UE as a part of the CSI report. For
example, the higher priority parts (e.g. part 1) can include a 1 or
2-bit indication, and once gNB decodes the higher priority parts
(e.g. part 1), the gNB knows about the information about
transmission of the lower priority parts (e.g. part 2).
[0228] In one example, this indication in the higher priority parts
(e.g. part 1) is 1-bit which indicates (A) full reporting or (B)
partial reporting.
[0229] In another example, this indication in the higher priority
parts (e.g. part 1) is 1-bit which indicates (A) full reporting or
(C) dropping.
[0230] In yet another example, this indication in the higher
priority parts (e.g. part 1) is 1-bit which indicates (B) partial
reporting or (C) dropping
[0231] In yet another example, this indication in the higher
priority parts (e.g. part 1) is 2-bit which indicates (A) full
reporting or (B) partial reporting or (C) dropping.
[0232] In yet another example, this indication in the higher
priority parts (e.g. part 1) is 2-bit which indicates (A) full
reporting or (B1) partial reporting 1 or (B2) partial reporting 2
or (C) dropping, where (B1) partial reporting 1 corresponds to the
case in which the lower priority parts are reported partially for a
subset S1 of SBs, and where (B2) partial reporting 2 corresponds to
the case in which the lower priority parts are reported partially
for a subset S2 of SBs, and S1 and S2 differ in at least one
SB.
[0233] In one embodiment 1X, scheme 1B-10 of embodiment 1 is
extended to general two-part UCI design including the cases of
single component carrier (CC) or multiple CCs when carrier
aggregation (CA) is configured. In particular, the UCI comprises
two parts, a first UCI part for a first CSI part and a second UCI
parts for a second CSI parts, where CSI corresponds to one CC or
multiple CCs. If the UE finds that the total CSI payload P (the
number of UCI information bits associated with the CSI report)
exceeds the number of bits (B) that can be accommodated within the
PUSCH resources for UCI transmission (either explicitly or
implicitly allocated to the UE) or, optionally, exceeds a certain
threshold (either fixed or configured), the UE transmits only the
first UCI part and not the second UCI part; otherwise the UE
transmits both parts.
[0234] In one embodiment 1Y, scheme 1B-11 of embodiment 1 is
extended to general two-part UCI design including the cases of
single component carrier (CC) or multiple CCs when carrier
aggregation (CA) is configured. In particular, the UCI comprises
two parts, a first UCI part for a first CSI part and a second UCI
parts for a second CSI parts, where CSI corresponds to one CC or
multiple CCs.
[0235] If the UE finds that the total CSI payload (the number of
UCI information bits associated with the CSI report) exceeds the
number of bits that can be accommodated within the PUSCH resources
for UCI transmission (either explicitly or implicitly allocated to
the UE) or, optionally, exceeds a certain threshold (either fixed
or configured), the UE transmits the first UCI part as is. In
addition, the UE performs rate matching to the second UCI part.
This can be done, for instance, by increasing the channel coding
rate, or partially puncturing or selecting the output of the
channel encoder (e.g. Polar encoder), or by adjusting the
modulation-coding-scheme (MCS) and/or beta offset factor used by
the second UCI part. This rate matching can include no transmission
(complete puncturing) as a special case, if the payload associated
with the second UCI part is too large compared to a certain
threshold.
[0236] In one embodiment 1Z, scheme 1B-12 of embodiment 1 is
extended to general two-part UCI design including the cases of
single component carrier (CC) or multiple CCs when carrier
aggregation (CA) is configured. In particular, the UCI comprises
two parts, a first UCI part for a first CSI part and a second UCI
parts for a second CSI parts, where CSI corresponds to one CC or
multiple CCs. If the UE finds that the total CSI payload (the
number of UCI information bits associated with the CSI report)
exceeds the number of bits that can be accommodated within the
PUSCH resources for UCI transmission (either explicitly or
implicitly allocated to the UE) or, optionally, exceeds a certain
threshold (either fixed or configured), the UE transmits the first
UCI part as is.
[0237] In addition, the UE either transmits the second UCI part
partially (based on at least one of the alternatives in scheme
1B-12) or drops the second UCI part (hence does not report the
second UCI part). The information whether the second UCI part is
reported (A) fully for all SBs or (B) partially for a subset of SBs
or (C) dropped (not reported) for all SBs is determined according
to at least one of the alternatives in scheme 1B-12.
[0238] FIG. 12C illustrates yet another example two-part UCI design
1240 according to embodiments of the present disclosure. The
embodiment of the two-part UCI design 1240 illustrated in FIG. 12C
is for illustration only. FIG. 12C does not limit the scope of this
disclosure to any particular implementation. As shown in FIG. 12C,
K.gtoreq.1 reports in step 1241 is partitioned and transmitted to
step 1242 and step 1243. In step 1242, for example RI, CQI, and I
are combined, and wideband PMI (i1) and subband PMI (i2) are
combined in step 1243. In step 1244, the number of bits (P1) in
Part 1 and the number of bits (P2) in Part 2 are added to each
other. In step 1245, a total number of bits (P=P1+P2) is compared
with a number of bits B. If P is greater than B, the UCI part 1 and
a partial CSI for the UCI part 2 are transmitted, otherwise, the
UCI part 1 and 2 are transmitted. In step 1246, the partial CSI for
the UCI part 2 is determined based on information from the UCI part
2 in step 1223.
[0239] The information whether the second UCI part is reported (A)
fully for all SBs or (B) partially for a subset of SBs or (C)
dropped (not reported) for all SBs is determined according to at
least one of the alternatives in scheme 1B-12.
[0240] In a variation of embodiment 1Z, as shown in FIG. 12C, the
two-part UCI design for K.gtoreq.1 CSI reports (e.g. CSI reports
for K CCs or cells) is as follows. The UCI for CSI report
i.di-elect cons.{0, 1, . . . , K-1} comprises two parts, a UCI part
1 (U.sub.i,1) for a CSI part 1 (comprising for example RI, CQI, and
indicator I) and a UCI part 2 (U.sub.i,2) for a CSI part 2
(comprising for example, WB PMI i.sub.1 and SB PMI i.sub.2).
[0241] If the UE finds that the total CSI payload, i.e., the number
of UCI information bits associated with the K CSI reports (e.g. CSI
reports for K CCs or cells),
P.sub.1+P.sub.2=.SIGMA..sub.i=0.sup.K-1(U.sub.i,1+U.sub.i,2),
exceeds the number of bits (B) that can be accommodated within the
PUSCH resources for UCI transmission (either explicitly or
implicitly allocated to the UE, e.g., based on the MCS, beta
offsets, and RA) or, optionally, exceeds a certain threshold
(either fixed or configured), the UE transmits the UCI part 1 for K
CSI reports (e.g. CSI reports for K CCs or cells) as is, which
consumes P.sub.1=.sub.i=0.sup.K-1U.sub.i,1 bits. In addition, the
UE transmits the UCI part 2 for K CSI reports (e.g. CSI reports for
K CCs or cells) partially.
[0242] FIG. 13 illustrates an example transmission priority 1300
according to embodiments of the present disclosure. The embodiment
of the transmission priority 1300 illustrated in FIG. 13 is for
illustration only. FIG. 13 does not limit the scope of this
disclosure to any particular implementation.
[0243] An example of partial UCI part 2 transmission is shown in
FIG. 13 wherein the entire UCI part 2 bits (e.g. information bits
or channel coding bits) are partitioned into several parts Q.sub.0,
Q.sub.1, Q.sub.2, . . . , and the priority for UCI transmission is
according to the index i of the UCI part Q.sub.i. For example, as
shown, the UCI part Q.sub.0 has the highest priority for
transmission, and the priority decreases as the index i increases.
An example (Alt 1Z-0) is also shown in FIG. 13, which is explained
later.
[0244] If the UCI part 2 comprises both WB and SB CSI components,
then at least one of the following alternatives is used for the
partial transmission of the UCI part 2 for K CSI reports. In these
alternatives, it is assumed that SBs are indexed as 0, 1, and 2 and
so on.
[0245] In one embodiment of Alt 1Z-0, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into four parts, Q.sub.0, Q.sub.1, Q.sub.2, Q.sub.3, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.3
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.3 corresponds to the MSB bits. In
one example, Q.sub.0 comprises WB CSI for all K CSI reports (e.g.
CSI reports for K CCs or cells). In one example, Q.sub.1 comprises
SB CSI for all odd-numbered SBs (1, 3, . . . ) for the first (i=0)
CSI report. In one example, Q.sub.2 comprises SB CSI for all
even-numbered SBs (0, 2, . . . ) for the first (i=0) CSI report. In
one example, Q.sub.3 comprises SB CSI for all SBs for remaining,
i=1, 2 . . . , K-1, CSI reports (e.g. CSI reports for K-1 CCs or
cells).
[0246] The priority rule or order for the transmission of these
parts is according to the increasing order of the index i of these
parts, i.e., Q.sub.0.fwdarw.Q.sub.1.fwdarw.Q.sub.2.fwdarw.Q.sub.3,
where Q.sub.0 has the highest priority for UCI transmission,
Q.sub.1 is next in priority for UCI transmission, followed by
Q.sub.2, and Q.sub.3 has the least priority. In other words, if
P.sub.2=.SIGMA..sub.i=0.sup.3Q.sub.i exceeds B-P.sub.1, then,
Q.sub.3 is dropped (not transmitted) first, and if the remaining
UCI bits P.sub.2-Q.sub.3=Q still exceeds B-P.sub.1, then Q.sub.2
and Q.sub.3 are dropped (not transmitted), and the dropping in this
order continues. Note that if B-P.sub.1<Q.sub.0, then the entire
UCI part 2 is not transmitted, otherwise at least Q.sub.0 is
transmitted.
[0247] In a variation of this alternative (Alt 1Z-0), the priority
order of odd-numbered SBs and even-numbered SBs is reversed, i.e.,
In one example, Q.sub.1 comprises SB CSI for all even-numbered SBs
(0, 2, . . . ) for the first (i=0) CSI report. In one example,
Q.sub.2 comprises SB CSI for all odd-numbered SBs (1, 3, . . . )
for the first (i=0) CSI report.
[0248] In one embodiment of Alt 1Z-1, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into three parts, Q.sub.0, Q.sub.1, Q.sub.2, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.2
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2 corresponds to the MSB bits. In
one example, Q.sub.0 comprises the following two sub-parts: WB CSI
for the first (i=0) CSI report; and SB CSI for all odd-numbered SBs
(1, 3, . . . ) for the first (i=0) CSI report. In one example,
Q.sub.1 comprises SB CSI for all even-numbered SBs (0, 2, . . . )
for the first (i=0) CSI report. In one example, Q.sub.2 comprises
the following two sub-parts: WB CSI for remaining, i=1, 2 . . . ,
K-1, CSI reports (e.g. CSI reports for K-1 CCs or cells); and SB
CSI for all SBs for remaining, i=1, 2 . . . , K-1, CSI reports
(e.g. CSI reports for K-1 CCs or cells).
[0249] The priority rule or order for the transmission of these
parts is according to the increasing order of the index i of these
parts, i.e., Q.sub.0.fwdarw.Q.sub.1.fwdarw.Q.sub.2, where Q.sub.0
has the highest priority for UCI transmission, Q.sub.1 is next in
priority for UCI transmission, and Q.sub.2 has the least priority.
In other words, if P.sub.2=.SIGMA..sub.i=0.sup.2Q.sub.i exceeds
B-P.sub.1, then, Q.sub.2 is dropped (not transmitted) first, and if
the remaining UCI bits P.sub.2-Q.sub.2=.SIGMA..sub.i=0.sup.1Q.sub.i
still exceeds B-P.sub.1, then Q.sub.1 and Q.sub.2 are dropped (not
transmitted), and the dropping in this order continues. Note that
if B-P.sub.1<Q.sub.0, then the entire UCI part 2 is not
transmitted, otherwise at least Q.sub.0 is transmitted.
[0250] In a variation of this alternative (Alt 1Z-1), the priority
order of odd-numbered SBs and even-numbered SBs for the first CSI
report (i=0) is reversed, i.e., in one example, Q.sub.0 comprises
the following two sub-parts comprises: WB CSI for the first (i=0)
CSI report; and SB CSI for all even-numbered SBs (0, 2, . . . ) for
the first (i=0) CSI report. In one example, Q.sub.1 comprises SB
CSI for all odd-numbered SBs (1, 3, . . . ) for the first (i=0) CSI
report.
[0251] In one embodiment of Alt 1Z-2, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into four parts, Q.sub.0, Q.sub.1, Q.sub.2, Q.sub.3, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.3
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.3 corresponds to the MSB
bits.
[0252] In one example, Q.sub.0 comprises the following two
sub-parts: WB CSI for all K CSI reports (e.g. CSI reports for K CCs
or cells); and SB CSI for one SB (e.g. SB index 0) and for all K
CSI reports (e.g. CSI reports for K CCs or cells). In one example,
Q.sub.1 comprises SB CSI for all odd-numbered SBs (1, 3, . . . )
for the first (i=0) CSI report. In one example, Q.sub.2 comprises
SB CSI for all remaining even-numbered SBs (2, 4, . . . ) for the
first (i=0) CSI report. In one example, Q.sub.3 comprises SB CSI
for remaining SBs (1, 2, . . . ) and for remaining, i=1, 2 . . . ,
K-1, CSI reports (e.g. CSI reports for K-1 CCs or cells).
[0253] The priority rule or order for the transmission of these
parts is as explained in Alt 1Z-0.
[0254] In a variation of this alternative (Alt 1Z-2), the priority
order of odd-numbered SBs and even-numbered SBs is reversed, i.e.,
In one example Q.sub.1 comprises SB CSI for all even-numbered SBs
(2, 4, . . . ) for the first (i=0) CSI report. In one example,
Q.sub.2 comprises SB CSI for all odd-numbered SBs (1, 3, . . . )
for the first (i=0) CSI report.
[0255] In one embodiment of Alt 1Z-3, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into three parts, Q.sub.0, Q.sub.1, Q.sub.2, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.2
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2 corresponds to the MSB
bits.
[0256] In one example, Q.sub.0 comprises the following two
sub-parts: WB CSI for all K CSI reports (e.g. CSI reports for K CCs
r cells); and SB CSI for all odd-numbered SBs (1, 3, . . . ) and
for all K CSI reports (e.g. CSI reports for K CCs or cells).
[0257] In one example, Q.sub.1 comprises SB CSI for all
even-numbered SBs (0, 2, . . . ) for the first (i=0) CSI report. In
one example, Q.sub.2 comprises SB CSI for all even-numbered SBs (0,
2, . . . ) for remaining, i=1, 2 . . . , K-1, CSI reports (e.g. CSI
reports for K-1 CCs or cells).
[0258] The priority rule or order for the transmission of these
parts is as explained in Alt 1Z-1.
[0259] In a variation of this alternative (Alt 1Z-3), the priority
order of odd-numbered SBs and even-numbered SBs is reversed, i.e.,
In one example, Q.sub.0 comprises the following two sub-parts: WB
CSI for all K CSI reports (e.g. CSI reports for K CCs or cells);
and SB CSI for all even-numbered SBs (0, 2, . . . ) and for all K
CSI reports (e.g. CSI reports for K CCs or cells). In one example,
Q.sub.1 comprises SB CSI for all odd-numbered SBs (1, 3, . . . )
for the first (i=0) CSI report. In one example, Q.sub.2 comprises
SB CSI for all odd-numbered SBs (1, 3, . . . ) for remaining, i=1,
2 . . . , K-1, CSI reports (e.g. CSI reports for K-1 CCs or
cells).
[0260] In one embodiment of Alt 1Z-4, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into 2K+1 parts, Q.sub.0, Q.sub.1, Q.sub.2 . . . . Q.sub.2K, where
Q.sub.0 corresponds to the most-significant (MSB) bits and Q.sub.2K
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2K corresponds to the MSB
bits.
[0261] In one example, Q.sub.0 comprises WB CSI for all K CSI
reports (e.g. CSI reports for K CCs or cells). For each CSI report,
i=0, 1, . . . K-1, Q.sub.2i+1 comprises SB CSI for all odd-numbered
SBs (1, 3, . . . ) for the i-th CSI report: and Q.sub.2(i+1)
comprises SB CSI for all even-numbered SBs (0, 2, . . . ) for the
i-th CSI report.
[0262] The priority rule or order for the transmission of these
parts is according to the increasing order of the index i of these
parts, i.e., Q.sub.0.fwdarw.Q.sub.1.fwdarw. . . . .fwdarw.Q.sub.2K,
where Q.sub.0 has the highest priority for UCI transmission,
Q.sub.1 is next in priority for UCI transmission, . . . , and
Q.sub.2K has the least priority. In other words, if
P.sub.2=.SIGMA..sub.i=0.sup.2KQ.sub.i exceeds B-P.sub.1, then,
Q.sub.2K is dropped (not transmitted) first, and if the remaining
UCI bits P.sub.2-Q.sub.2K=.SIGMA..sub.i=0.sup.2K-1Q.sub.i still
exceeds B-P.sub.1, then Q.sub.2K-.sub.1 and Q.sub.2K are dropped
(not transmitted), and the dropping in this order continues. Note
that if B-P.sub.1<Q.sub.0, then the entire UCI part 2 is not
transmitted, otherwise at least Q.sub.0 is transmitted.
[0263] In a variation of this alternative (Alt 1Z-4), the priority
order of odd-numbered SBs and even-numbered SBs is reversed, i.e.
In one example, Q.sub.2i+1 comprises SB CSI for all even-numbered
SBs (0, 2, . . . ) for the i-th CSI report. In one example,
Q.sub.2(i+1) comprises SB CSI for all odd-numbered SBs (1, 3, . . .
) for the i-th CSI report.
[0264] In one embodiment of Alt 1Z-5, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into 2K parts, Q.sub.0, Q.sub.1, . . . , Q.sub.2K-.sub.1, where
Q.sub.0 corresponds to the most-significant (MSB) bits and
Q.sub.2K-1 corresponds to the least significant (LSB) bits, or
Q.sub.0 corresponds to LSB bits and Q.sub.2K-1 corresponds to the
MSB bits.
[0265] For each CSI report, i=0, 1, . . . K-1: Q.sub.2i comprises
the following two sub-parts WB CSI for the i-th CSI report and SB
CSI for all odd-numbered SBs (1, 3, . . . ) for the i-th CSI
report; and Q.sub.2i+1 comprises SB CSI for all even-numbered SBs
(0, 2, . . . or) for the i-th CSI report.
[0266] The priority rule or order for the transmission of these
parts is according to the increasing order of the index i of these
parts, i.e., Q.sub.0.fwdarw.Q.sub.1.fwdarw. . . .
.fwdarw.Q.sub.2K-1, where Q.sub.0 has the highest priority for UCI
transmission, Q.sub.1 is next in priority for UCI transmission, and
Q.sub.2K-1 has the least priority. In other words, if
P.sub.2=.SIGMA..sub.i=0.sup.2K-1Q.sub.i exceeds B-P.sub.1, then,
Q.sub.2K-1 is dropped (not transmitted) first, and if the remaining
UCI bits P.sub.2-Q.sub.2K-1=.SIGMA..sub.i=0.sup.2K-2Q.sub.i still
exceeds B-P.sub.1, then Q.sub.2K-2 and Q.sub.2K-1 are dropped (not
transmitted), and the dropping in this order continues. Note that
if B-P.sub.1<Q.sub.0, then the entire UCI part 2 is not
transmitted, otherwise at least Q.sub.0 is transmitted.
[0267] In a variation of this alternative (Alt 1Z-5), the priority
order of odd-numbered SBs and even-numbered SBs for the first CSI
report (i=0) is reversed, i.e.,
[0268] For each CSI report, i=0, 1, . . . K-1: Q.sub.2i comprises
the following two sub-parts WB CSI for the i-th CSI report and SB
CSI for all even-numbered SBs (0, 2, . . . ) for the i-th CSI
report; and Q.sub.2i+1 comprises SB CSI for all odd-numbered SBs
(1, 3, . . . ) for the i-th CSI report.
[0269] In one embodiment of Alt 1Z-6, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
2K+1 parts, Q.sub.0, Q.sub.1, . . . . Q.sub.2K, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.2K
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2K corresponds to the MSB bits.
In one example, Q.sub.0 comprises the following two sub-parts: WB
CSI for all K CSI reports (e.g. CSI reports for K CCs or cells);
and SB CSI for one SB (e.g. SB index 0) and for all K CSI reports
(e.g. CSI reports for K CCs or cells).
[0270] For each CSI report, i=0, 1, . . . K-1, Q.sub.2i+1 comprises
SB CSI for all odd-numbered SBs (1, 3, . . . ) for the i-th CSI
report; and Q.sub.2(i+1) comprises SB CSI for remaining
even-numbered SBs (2, 4, . . . ) for the i-th CSI report.
[0271] The priority rule or order for the transmission of these
parts is as explained in Alt 1Z-4.
[0272] In a variation of this alternative (Alt 1Z-6), the priority
order of odd-numbered SBs and even-numbered SBs is reversed, i.e.
In one example, Q.sub.2i+1 comprises SB CSI for remaining
even-numbered SBs (2, 4, . . . ) for the i-th CSI report. In one
example, Q.sub.2(i+1) comprises SB CSI for all odd-numbered SBs (1,
3, . . . ) for the i-th CSI report.
[0273] In on embodiment of Alt 1Z-7, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into K parts, Q.sub.0, Q.sub.1, . . . , Q.sub.2K-1, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.K-1
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.K-1 corresponds to the MSB bits.
In one example, Q.sub.0 comprises the following two sub-parts: WB
CSI for all K CSI reports (e.g. CSI reports for K CCs or cells);
and SB CSI for all odd-numbered SBs (1, 3, . . . ) and for all K
CSI reports (e.g. CSI reports for K CCs or cells).
[0274] For each CSI report, i=0, 1, . . . K-1, Q.sub.i+1 comprises
SB CSI for all even-numbered SBs (0, 2, . . . or) for the i-th CSI
report.
[0275] The priority rule or order for the transmission of these
parts is as explained in Alt 1Z-1.
[0276] In a variation of this alternative (Alt 1Z-7), the priority
order of odd-numbered SBs and even-numbered SBs is reversed, i.e.,
in one example, Q.sub.0 comprises the following two sub-parts: WB
CSI for all K CSI reports (e.g. CSI reports for K CCs or cells);
and SB CSI for all even-numbered SBs and for all K CSI reports
(e.g. CSI reports for K CCs or cells).
[0277] For each CSI report, i=0, 1, . . . K-1, Q.sub.i+1 comprises
SB CSI for all odd-numbered SBs for the i-th CSI report.
[0278] In one embodiment of Alt 1Z-8, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into two parts, Q.sub.0, Q.sub.1, where Q.sub.0 corresponds to the
most-significant (MSB) bits and Q.sub.1 corresponds to the least
significant (LSB) bits, or Q.sub.0 corresponds to LSB bits and
Q.sub.1 corresponds to the MSB bits. In one example, Q.sub.0
comprises WB CSI for all K CSI reports (e.g. CSI reports for K CCs
or cells). In one example, Q.sub.1 comprises SB CSI for all SBs and
for all K CSI reports.
[0279] The priority rule or order for the transmission of these
parts is as explained in earlier alternatives. i.e., Q.sub.0 has
higher priority for UCI transmission compared to Q.sub.1. In other
words, if P.sub.2=.SIGMA..sub.i=0.sup.1Q.sub.i exceeds B-P.sub.1,
then, Q.sub.1 is dropped (not transmitted) first, and if the
remaining UCI bits P.sub.2-Q.sub.1=Q.sub.0 still exceeds B-P.sub.1,
then both Q.sub.0 and Q.sub.1 are dropped (not transmitted), hence
the entire UCI part 2 is not transmitted.
[0280] In one embodiment of Alt 1Z-9, the UCI part 2 bits (e.g. CSI
bits or information bits or channel coding bits) are partitioned
into three parts, Q.sub.0, Q.sub.1, Q.sub.2, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.2
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2 corresponds to the MSB bits. In
one example, Q.sub.0 comprises WB CSI for all K CSI reports (e.g.
CSI reports for K CCs or cells). In one example, Q.sub.1 comprises
SB CSI for a subset of SB indices S and for all K CSI reports where
the set S is fixed. In one example, Q.sub.2 comprises SB CSI for
remaining SBs (all SBs except those in the set S) and for all K CSI
reports.
[0281] Two examples of the set S are S={0} and S={1}. The priority
rule or order for the transmission of these parts is as explained
in earlier alternatives.
[0282] In one embodiment of Alt 1Z-10, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into M+1 parts, Q.sub.0, Q.sub.1, . . . , Q.sub.M,
where M is the number of SBs, Q.sub.0 corresponds to the
most-significant (MSB) bits and Q.sub.M corresponds to the least
significant (LSB) bits, or Q.sub.0 corresponds to LSB bits and
Q.sub.M corresponds to the MSB bits. In one example, Q.sub.0
comprises WB CSI for all K CSI reports (e.g. CSI reports for K CCs
or cells).
[0283] For each SB index, j=0, 1, . . . M-1, Q.sub.j+1 comprises SB
CSI for SB index j and for all K CSI reports.
[0284] The priority rule or order for the transmission of these
parts is as explained in earlier alternatives. Note that in this
alternative, it is assumed that the number of SBs for all CSI
reports is the same. If it is different for different CSI repots,
then M is maximum of the number of SBs for all CSI reports, and for
a SB index j.di-elect cons.{(0, 1, . . . , M-1}, and a CSI report
index i E {(0, 1, . . . , K-1}, there is no CSI to report, then the
corresponding report is skipped (not reported) in that part
Q.sub.j+1.
[0285] In one embodiment of Alt 1Z-11, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into M+1 parts, Q.sub.0, Q.sub.1, . . . , Q.sub.M,
where M is the number of SBs, Q.sub.0 corresponds to the
most-significant (MSB) bits and Q.sub.M corresponds to the least
significant (LSB) bits, or Q.sub.0 corresponds to LSB bits and
Q.sub.M corresponds to the MSB bits. In one example, Q.sub.0
comprises WB CSI for all K CSI reports (e.g. CSI reports for K CCs
or cells).
[0286] For each even-numbered SB index,
j = 0 , , : Q j 2 + 1 ##EQU00005##
comprises SB CSI for even-numbered SB index j and for all K CSI
reports. For each odd-numbered SB index,
j = 1 , 3 , , Q M 2 + j 2 + 1 ##EQU00006##
comprises SB CSI for odd-numbered SB index j and for all K CSI
reports. The rest of details are the same as in Alt 1Z-10.
[0287] In one embodiment of Alt 1Z-12, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into M+1 parts, Q.sub.0, Q.sub.1, . . . , Q.sub.M,
where M is the number of SBs, Q.sub.0 corresponds to the
most-significant (MSB) bits and Q.sub.M corresponds to the least
significant (LSB) bits, or Q.sub.0 corresponds to LSB bits and
Q.sub.M corresponds to the MSB bits. In one example, Q.sub.0
comprises WB CSI for all K CSI reports (e.g. CSI reports for K CCs
or cells).
[0288] For each odd-numbered SB index,
j = 1 , 3 , , Q j + 1 2 ##EQU00007##
comprises SB CSI for odd-numbered SB index j and for all K CSI
reports. For each even-numbered SB index,
j = 0 , 2 , , Q M 2 + j 2 + 1 ##EQU00008##
comprises SB CSI for even-numbered SB index j and for all K CSI
reports. The rest of details are the same as in Alt 1Z-10.
[0289] In one embodiment of Alt 1Z-13, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into M+1 parts, Q.sub.0, Q.sub.1, . . . , Q.sub.M,
where M is the number of SBs, Q.sub.0 corresponds to the
most-significant (MSB) bits and Q.sub.M corresponds to the least
significant (LSB) bits, or Q.sub.0 corresponds to LSB bits and
Q.sub.M corresponds to the MSB bits. In one example, Q.sub.0
comprises WB CSI for all K CSI reports (e.g. CSI reports for K CCs
or cells). For index, j=0, 2, . . . , Q.sub.j comprises SB CSI for
odd-numbered SB index j+1 and for all K CSI reports; and Q.sub.j+1
comprises SB CSI for even-numbered SB index j and for all K CSI
reports. The rest of details are the same as in Alt 1Z-10.
[0290] In Alt 1Z-14, the UCI part 2 bits (e.g. CSI bits or
information bits or channel coding bits) are partitioned into M+1
parts, Q.sub.0, Q.sub.1, . . . , Q.sub.M, where M is the number of
SBs, Q.sub.0 corresponds to the most-significant (MSB) bits and
Q.sub.M corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.M corresponds to the MSB bits. In
one example, Q.sub.0 comprises WB CSI for all K CSI reports (e.g.
CSI reports for K CCs or cells). For index, j=0, 2, . . . , Q.sub.j
comprises SB CSI for even-numbered SB index j and for all K CSI
reports; and Q.sub.j+1 comprises SB CSI for odd-numbered SB index
j+1 and for all K CSI reports. The rest of details are the same as
in Alt 1Z-10.
[0291] In one embodiment of Alt 1Z-15, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into three parts, Q.sub.0, Q.sub.1, Q.sub.2, where
Q.sub.0 corresponds to the most-significant (MSB) bits and Q.sub.2
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2 corresponds to the MSB bits. In
one example, Q.sub.0 comprises WB CSI for all K CSI reports (e.g.
CSI reports for K CCs or cells). In one example, Q.sub.1 comprises
SB CSI for all odd-numbered SBs (1, 3, . . . ) for the first (i=0)
CSI report. In one example, Q.sub.2 comprises the following two
sub-parts: SB CSI for all even-numbered SBs (0, 2, . . . ) for the
first (i=0) CSI report; and SB CSI for all SBs for remaining, i=1,
2 . . . , K-1, CSI reports (e.g. CSI reports for K-1 CCs or cells).
The priority rule or order for the transmission of these parts is
as explained in Alt 1Z-1.
[0292] In a variation of this alternative (Alt 1Z-15), the priority
order of odd-numbered SBs and even-numbered SBs for the first (i=0)
CSI report is reversed, i.e., Q.sub.1 and Q.sub.2 are as follows.
In one example, Q.sub.Z comprises SB CSI for all even-numbered SBs
(0, 2, . . . ) for the first (i=0) CSI report. In one example,
Q.sub.2 comprises the following two sub-parts: SB CSI for all
odd-numbered SBs (1, 3, . . . ) for the first (i=0) CSI report; and
SB CSI for all SBs for remaining, i=1, 2 . . . , K-1, CSI reports
(e.g. CSI reports for K-1 CCs or cells).
[0293] In one embodiment of Alt 1Z-16, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into three parts, Q.sub.0, Q.sub.1, Q.sub.2, where
Q.sub.0 corresponds to the most-significant (MSB) bits and Q.sub.2
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2 corresponds to the MSB bits. In
one example, Q.sub.0 comprises WB CSI for all K CSI reports (e.g.
CSI reports for K CCs or cells). In one example, Q.sub.1 comprises
SB CSI for all SBs of the first (i=0) CSI report. In one example,
Q.sub.2 comprises SB CSI for all SBs of remaining, i=1, 2 . . . ,
K-1, CSI reports (e.g. CSI reports for K-1 CCs or cells). The
priority rule or order for the transmission of these parts is as
explained in Alt 1Z-1.
[0294] In a variation of this alternative, Q.sub.2 is replaced with
the following K-1 parts, i.e., UCI part 2 bits (e.g. CSI bits or
information bits or channel coding bits) are partitioned into K+1
parts. For index, j=1, . . . , K-1, Q.sub.j+1 comprises SB CSI for
all SBs of the j-th CSI report.
[0295] In one embodiment of Alt 1Z-17, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into three parts, Q.sub.0, Q.sub.1, Q.sub.2, where
Q.sub.0 corresponds to the most-significant (MSB) bits and Q.sub.2
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.2 corresponds to the MSB bits. In
one example, Q.sub.0 comprises the following two sub-parts: WB CSI
for all K CSI reports (e.g. CSI reports for K CCs or cells); and SB
CSI for all odd-numbered SBs (1, 3, . . . ) for the first (i=0) CSI
report. In one example, Q.sub.1 comprises SB CSI for all
even-numbered SBs (0, 2, . . . ) for the first (i=0) CSI report. In
one example, Q.sub.2 comprises SB CSI for all SBs for remaining,
i=1, 2 . . . , K-1, CSI reports (e.g. CSI reports for K-1 CCs or
cells). The priority rule or order for the transmission of these
parts is as explained in Alt 1Z-1.
[0296] In a variation of this alternative (Alt 1Z-17), the priority
order of odd-numbered SBs and even-numbered SBs for the first (i=0)
CSI report is reversed, i.e., Q.sub.0 and Q.sub.1 are as follows.
In one example, Q.sub.0 comprises the following two sub-parts: WB
CSI for all K CSI reports (e.g. CSI reports for K CCs or cells);
and SB CSI for all even-numbered SBs (0, 2, . . . ) for the first
(i=0) CSI report. In one example, Q.sub.1 comprises SB CSI for all
odd-numbered SBs (1, 3, . . . ) for the first (i=0) CSI report.
[0297] In another variation of this alternative, Q.sub.2 is
replaced with the following K-1 parts, i.e., UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into K+1 parts. For index, j=1, . . . , K-1, Q.sub.j+1
comprises SB CSI for all SBs of the j-th CSI report.
[0298] In one embodiment of Alt 1Z-18, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into two parts, Q.sub.0, Q.sub.1, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.1
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.1 corresponds to the MSB bits. In
one example, Q.sub.0 comprises the following two sub-parts: WB CSI
for all K CSI reports (e.g. CSI reports for K CCs or cells); and SB
CSI for all odd-numbered SBs (1, 3, . . . ) for the first (i=0) CSI
report. In one example, Q.sub.1 comprises the following two
sub-parts: SB CSI for all even-numbered SBs (0, 2, . . . ) for the
first (i=0) CSI report; and SB CSI for all SBs for remaining, i=1,
2 . . . , K-1, CSI reports (e.g. CSI reports for K-1 CCs or cells).
The priority rule or order for the transmission of these parts is
as explained in Alt 1Z-8.
[0299] In a variation of this alternative (Alt 1Z-18), the priority
order of odd-numbered SBs and even-numbered SBs for the first (i=0)
CSI report is reversed, i.e., Q.sub.0 and Q.sub.1 are as follows.
In one example, Q.sub.0 comprises the following two sub-parts: WB
CSI for all K CSI reports (e.g. CSI reports for K CCs or cells);
and SB CSI for all even-numbered SBs (0, 2, . . . ) for the first
(i=0) CSI report. In one example, Q.sub.1 comprises the following
two sub-parts: SB CSI for all odd-numbered SBs (1, 3, . . . ) for
the first (i=0) CSI report; and SB CSI for all SBs for remaining,
i=1, 2 . . . , K-1, CSI reports (e.g. CSI reports for K-1 CCs or
cells).
[0300] In one embodiment of Alt 1Z-19, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into two parts, Q.sub.0, Q.sub.1, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.1
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.1 corresponds to the MSB bits. In
one example, Q.sub.0 comprises the following two sub-parts: WB CSI
for all K CSI reports (e.g. CSI reports for K CCs or cells); and SB
CSI for all SBs of the first (i=0) CSI report. In one example,
Q.sub.1 comprises SB CSI for all SBs for remaining, i=1, 2 . . . ,
K-1, CSI reports (e.g. CSI reports for K-1 CCs or cells). The
priority rule or order for the transmission of these parts is as
explained in Alt 1Z-8.
[0301] In a variation of this alternative, Q.sub.1 is replaced with
the following K-1 parts, i.e., UCI part 2 bits (e.g. CSI bits or
information bits or channel coding bits) are partitioned into K
parts. For index, j=1, . . . , K-1, Q.sub.j comprises SB CSI for
all SBs of the j-th CSI report.
[0302] In one embodiment of Alt 1Z-20, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into two parts, Q.sub.0, Q.sub.1, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.1
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.1 corresponds to the MSB bits. In
one example, Q.sub.0 corresponds to the CSI of the first (i=0) CSI
report, and comprises the following two sub-parts: WB CSI of the
first (i=0) CSI report; and SB CSI for all SBs of the first (i=0)
CSI report.
[0303] In one example, Q.sub.Z corresponds to the CSI of the
remaining, i=1, 2 . . . , K-1, CSI reports (e.g. CSI reports for
K-1 CCs or cells), and comprises the following two sub-parts: WB
CSI of the remaining CSI reports; and SB CSI for all SBs of the
remaining CSI reports. The priority rule or order for the
transmission of these parts is as explained in Alt 1Z-8.
[0304] In a variation of this alternative, Q.sub.1 is replaced with
the following K-1 parts, i.e., UCI part 2 bits (e.g. CSI bits or
information bits or channel coding bits) are partitioned into K
parts. For index, j=1, . . . , K-1, Q.sub.j+1 corresponds to the
CSI for the j-th CSI report, and comprises the following two
sub-parts: WB CSI of the j-th CSI report; and SB CSI for all SBs of
the j-th CSI report.
[0305] In one embodiment of Alt 1Z-21, the UCI part 2 bits (e.g.
CSI bits or information bits or channel coding bits) are
partitioned into two parts, Q.sub.0, Q.sub.1, where Q.sub.0
corresponds to the most-significant (MSB) bits and Q.sub.1
corresponds to the least significant (LSB) bits, or Q.sub.0
corresponds to LSB bits and Q.sub.1 corresponds to the MSB
bits.
[0306] In one example, Q.sub.0 comprises the following two
sub-parts: WB CSI of the first (i=0) CSI report; and SB CSI for all
odd-numbered SBs (1, 3, . . . ) for the first (i=0) CSI report. In
one example, Q.sub.1 comprises the following three sub-parts: SB
CSI for all even-numbered SBs (0, 2, . . . ) for the first (i=0)
CSI report; WB CSI of the remaining (i=1, 2, . . . , K-1) CSI
reports; and SB CSI for all SBs for remaining, i=1, 2 . . . , K-1,
CSI reports (e.g. CSI reports for K-1 CCs or cells). The priority
rule or order for the transmission of these parts is as explained
in Alt 1Z-8.
[0307] In a variation of this alternative (Alt 1Z-21), the priority
order of odd-numbered SBs and even-numbered SBs for the first (i=0)
CSI report is reversed, i.e., Q.sub.0 and Q.sub.1 are as follows.
In one example, Q.sub.0 comprises WB CSI of the first (i=0) CSI
report; and SB CSI for all even-numbered SBs (0, 2, . . . ) for the
first (i=0) CSI report. In one example, Q.sub.1 comprises SB CSI
for all odd-numbered SBs (1, 3, . . . ) for the first (i=0) CSI
report; WB CSI of the remaining (i=1, 2, . . . , K-1) CSI reports;
and SB CSI for all SBs for remaining, i=1, 2 . . . , K-1, CSI
reports (e.g. CSI reports for K-1 CCs or cells).
[0308] If the CSI part 2 comprises only SB components, then a
variation of at least one of the alternatives (Alt 1Z-0 through Alt
1Z-21) is used for the partial transmission of the UCI part 2 for K
CSI reports wherein the part(s) Q.sub.i of UCI part 2 that
include(s) WB CSI is (are) either removed entirely (if the part
comprises only WB CSI) or modified to includes only SB CSI (if the
part comprises both WB and SB CSI).
[0309] In the aforementioned embodiments, Alt 1Z-0 through Alt
1Z-21, the K CSI reports (e.g. CSI reports for K CCs or cells) are
sorted (numbered) according to at least one of the following
alternatives.
[0310] In one embodiment of Alt 1Z-A, the K CSI reports are sorted
(numbered) based on a pre-defined rule. For example, if the CSI
reports correspond to K CCs or cells, then the CSI reports are
numbered (sorted) in increasing order of CC or cell number, or, the
CSI reports are numbered (sorted) in decreasing order of CC or cell
number.
[0311] In one embodiment of Alt 1Z-B, the sorting (numbering)
information is configured and/or indicated by the network or gNB.
For example, the network or gNB can configure/indicate the network
or gNB's preference/priority to receive multiple CSI reports if the
UCI part 2 is transmitted partially. This configuration/indication
is either via higher layer (e.g. RRC) signaling or MAC CE based
signaling or dynamic DCI (UL-related or DL-related) based
signaling.
[0312] In one embodiment of Alt 1Z-C, the UE reports the numbering
(sorting) information, for example in UCI part 1.
[0313] Some alternatives for PMI part I and PMI part II included in
codeword segment 1 and codeword segment 2, respectively, in Scheme
1/Scheme 1A/Scheme 1B above can be described as follows.
[0314] In a first sub-embodiment of Scheme 1, PMI part I comprises
the PMI reporting parameters associated with the first layer
whereas PMI part II comprises PMI reporting parameters associated
with the second to the last layer (with RI=L, this layer
corresponds to the L.sup.th). This embodiment is relevant
especially for Type II CSI when PMI can be defined per layer.
[0315] In a second sub-embodiment of Scheme 1, PMI part I comprises
the PMI reporting parameters associated with the first or first
stage (wideband) PMI parameter i.sub.1, or (i.sub.11, i.sub.12)
which is common for all the layers, whereas PMI part II comprises
PMI reporting parameters associated with the second or second stage
PMI parameter i.sub.2 (which is RI-dependent). This embodiment is
relevant for both Type I and Type II CSI when PMI payload depends
on the value of RI. In one example use case of this sub-embodiment
where PMI frequency granularity is per subband, RI and the first or
first stage (wideband) PMI parameter i.sub.1, or (i.sub.11,
i.sub.12)--one i.sub.1 report per CSI reporting band regardless of
PMI frequency granularity. The second or second stage PMI parameter
i.sub.2 (which is RI-dependent) can be reported per subband.
[0316] In a third sub-embodiment of Scheme 1, PMI part I comprises
the PMI reporting parameters associated with the first or first
stage (wideband) PMI parameter i.sub.1, or (i.sub.11, i.sub.12)
which is common for all the layers, as well as the second or second
stage PMI parameter i.sub.2 associated with the first layer. PMI
part II comprises PMI reporting parameters associated with the
second or second stage PMI parameter i.sub.2 associated with the
second to the last layer (with RI=L, this layer corresponds to the
L.sup.th). This embodiment is relevant especially for Type II CSI
when PMI can be defined per layer.
[0317] In a fourth sub-embodiment of Scheme 1, when a UE is
configured with CRI reporting (with or without CSI-RSRP), CRI or
CRI+CSI-RSRP can be included in codeword segment 1, that is,
jointly encoded with RI and at least one other CSI parameter whose
payload size is independent of RI value.
[0318] In a fifth sub-embodiment of Scheme 1 which is applicable
for Type II CSI reporting with rank 1-2, WB beam amplitude/power
coefficients (WB amp 1 for layer 1) can be reported separately in
addition to the first PMI (PMI part I) i.sub.1 which indicates L
beams (where L=2, 3, or 4). The PMI part I comprises RI, CQI, PMI
part I and WB amp 1 (for layer 1), and the PMI part II comprises
PMI part II, WB amp 2 (for layer 2 if RI=2), SB amp 1 (for layer
1), and SB amp 2 (for layer 2 if RI=2).
[0319] In a sixth sub-embodiment of Scheme 1 which is applicable
for Type II CSI reporting with rank 1-2, WB beam amplitude/power
coefficients (WB amp 1 for layer 1 and layer 2, if RI=2) can be
reported separately in addition to the first PMI (PMI part I)
i.sub.1. The PMI part I comprises RI, CQI, PMI part I, WB amp 1
(for layer 1) and WB amp 2 (for layer 2 if RI=2), and the PMI part
II comprises PMI part II, SB amp 1 (for layer 1), and SB amp 2 (for
layer 2 if RI=2).
[0320] Component 2--Aperiodic CSI (A-CSI) Reporting in Three
Parts
[0321] In one embodiment of the present disclosure (Scheme 2), the
CSI parameters included in PMI are partitioned into three parts:
PMI part I, PMI part II, PMI part III. When a UE is configured with
RI reporting, RI, CQI, and PMI part I are jointly encoded to form a
codeword segment 1. PMI part II is jointly encoded to form another
codeword segment 2. PMI part III is jointly encoded to form another
codeword segment 3.
[0322] For aperiodic CSI (A-CSI) reporting, gNB allocates resource
(UL RBs) for UCI transmission (e.g. on PUSCH) without knowing what
the UE reports for RI. For Type II, the payload difference between
RI=1 and RI=2 is large, i.e., the payload for RI=2 is approximately
2 times of that for RI=1. The resource allocation is according to
at least one of the following schemes.
[0323] In one embodiment of scheme 2A, the PMI part I corresponds
to L (where L=2, 3, or 4) beams which are common for both RI=1 and
RI=2, PMI part II corresponds to WB amp 1 for layer 1 and WB amp 2
for layer 2 (if RI=2 is reported), and PMI part III corresponds to
SB amp 1 and SB phase 1 for layer 1 and SB amp 2 and SB phase 2 for
layer 2 (if RI=2 is reported). The resource allocation for the
codeword segment 1 (which includes PMI part I), codeword segment 2
(which includes PMI part II), codeword segment 3 (which includes
PMI part III) are in three different slots (or subframes).
[0324] When A-CSI reporting is triggered, PUSCH resource is
allocated according to the fixed payload size of codeword segment
1. Depending on the RI value (included in codeword segment 1)
reported in the first CSI reporting instance, gNB determines RA to
trigger another (second) A-CSI reporting for codeword segment 2.
Depending on the RI value (included in codeword segment 1) reported
in the first CSI reporting instance and WB amplitude (included in
PMI part II), gNB determines RA to trigger another (third) A-CSI
reporting for codeword segment 3.
[0325] In a variation of this scheme (2A-1), the resource
allocation for the codeword segment 2 or/and 3 (regardless of the
reported RI and WB amp 1 and WB amp 2) is fixed. So, there is no
need for additional signaling for the resource location for
codeword segment 2 and 3. For example, the resource allocation (UL
RBs) can be fixed and correspond to maximum payload for each PMI
part assuming RI=2.
[0326] In another variation of this scheme (2A-2), the resource
allocation for the codeword segment 2 or/and 3 is configured (via
DCI triggering or signaling). For example, the resource allocation
(UL RBs) can be determined based on the beta offset (in LTE) with
respect to the resource allocation for codeword segment 1.
[0327] In another variation of scheme 2A/2A-1/2A-2, the WB amp 1 is
included in PMI part I. Note that in this case, PMI part II
comprises WB amp 2 if RI=2, and PMI part II is not reported if
RI=1.
[0328] In another variation of scheme 2A/2A-1/2A-2, PMI part I is
included on PMI part II. Note that in this case, PMI part I
comprises RI and CQI, and PMI part II comprises L beams, WB amp 1
and WB amp 2.
[0329] In this scheme and also in the rest of embodiments in the
present disclosure, WB amp 1 and WB amp 2 respectively include the
explicit indication of the strongest (out of 2L coefficients)
coefficient for layer 1 and layer 2.
[0330] In scheme 2B, the PMI part I, PMI part II, and PMI part III
are configured to be reported in a single slot or subframe
according to at least one of the following variations of scheme
2B.
[0331] In one embodiment of Scheme 2B-0, the resource allocation
(RA) scheme or signaling for UL-related DCI is used for the purpose
of UCI transmission assuming a fixed value of RI if Type II CSI
reporting is configured regardless of the reported value of RI. For
example, the fixed value of RI for RA is RI=2.
[0332] In one embodiment of Scheme 2B-1, the resource allocation
(RA) scheme or signaling for UL-related DCI is used for the purpose
of UCI transmission. A UE (and later gNB upon receiving the A-CSI
report) interprets the RA field differently depending on the value
of RI and regardless of the reported value of WB amp 1 and WB amp
2. The UE assumes a default RA=X PRBs which corresponds to a fixed
RI value. For example, when X PRBs correspond to RI=1, then the UE
assumes that the number of PRBs=K*X when RI=2, where K is a
constant.
[0333] In one example of Alt2.1, K is configurable either
semi-statically (via RRC, higher layer signaling), or more
dynamically (via MAC CE based or DCI signaling).
[0334] In one example of Alt2.2, K is pre-defined in the
specification, e.g. K=1.5, or 2.
[0335] In one example of Alt2.3, K is determined implicitly
depending on, e.g. frequency granularity ("wideband, or partial
band, or subband" or "one report for all subbands or one report per
subband") of CQI and/or PMI. TABLE 4 shows an example.
TABLE-US-00004 TABLE 4 K values Frequency granularity for PMI K
Wideband 1 Partial band 2 Subband 2
[0336] In one embodiment of Scheme 2B-2, the resource allocation
(RA) scheme or signaling for UL-related DCI is used for the purpose
of UCI transmission. UE (and later gNB upon receiving the A-CSI
report) interprets the RA field differently depending on the value
of RI and the reported value of WB amp 1 and WB amp 2. The UE
assumes a default RA=X PRBs which corresponds to a fixed RI value
and a fixed number of WB amp 1 and WB amp that are greater than 0.
For example, when X PRBs correspond to RI=1 and 2L-1 WB amp 1
(assuming all of X PRBs are greater than 0), then the UE assumes
that the number of PRBs=K*M*X when RI=2, where K and M are
constant.
[0337] In one example of Alt2.4, K and M are configurable either
semi-statically (via RRC, higher layer signaling), or more
dynamically (via MAC CE based or DCI signaling).
[0338] In one example of Alt2.5 K and L are pre-defined in the
specification, e.g. K=1.5, or 2, and M=1 or 2.
[0339] In one example of Alt2.6 K and L are determined implicitly
depending on, e.g. frequency granularity ("wideband, or partial
band, or subband" or "one report for all subbands or one report per
subband") of CQI and/or PMI. TABLE 5 shows an example.
TABLE-US-00005 TABLE 5 K values Frequency granularity for PMI K L
Wideband 1 1 Partial band 2 2 Subband 2 2
[0340] In one embodiment of Scheme 2B-3, in addition to the normal
bit allocation for UCI transmission, additional bit(s) is (are)
added in UL-related DCI to signal RA for both RI=1 and RI=2, or/and
for both WB amp 1 and 2=0 and greater than 0 if Type II CSI
reporting is configured. These additional bit(s) can be a part of
at least one of or a combination of RA field or CSI request field,
or other fields in the UL-related DCI. With these additional bits,
the UL-related DCI signaling is expanded to indicate multiple
hypotheses for two different RI values and multiple payload
alternatives depending on number of WB amp 1 and 2=0 or greater
than 0.
[0341] In one embodiment of Scheme 2B-4, the gNB triggers A-CSI for
a certain value of RI or/and a certain number of WB amp 1 or/and 2
greater than 0, and specifies the value of RI or/and the value of
number of WB amp 1 or/and 2 greater than 0 in the UL-related DCI.
The RA is according to the configured value of RI and number of WB
amp 1 or/and 2 greater than 0. Note that in this case even when the
UE can support RI=2, the gNB may request only RI=1 CSI. RI
reporting can be according to one of the following two options.
[0342] In one example of Alt1.4, a UE does not report RI and
reports the CSI corresponding to the configured value of RI.
[0343] In one example of Alt1.5, a UE reports RI, which can be
different from the RI configured by the gNB. For example, if the
configured value of RI=2, UE can report RI=1 or RI=2.
[0344] In one embodiment of Scheme 2B-5, the scheme is the same as
the aforementioned Scheme 1B-3. In one embodiment of Scheme 2B-6,
the scheme is the same as the aforementioned Scheme 1B-4. In one
embodiment, of Scheme 2B-7, the scheme is the same as Scheme 1B-5.
In one embodiment of Scheme 2B-8, the scheme is the same as the
aforementioned Scheme 1B-6. In one embodiment of Scheme 2B-9, the
scheme is the same as the aforementioned Scheme 1B-7. In one
embodiment of Scheme 2B-10, the scheme is the same as the
aforementioned Scheme 1B-8. In one embodiment of Scheme 2B-11, the
scheme is the same as the aforementioned Scheme 1B-9 wherein RM is
performed on the second part and/or the third part if the UCI
payload is smaller or exceeds that accommodated by the indicated
RA/MCS.
[0345] FIG. 14 illustrates an example three-part UCI design 1400
according to embodiments of the present disclosure. The embodiment
of the three-part UCI design 1400 illustrated in FIG. 14 is for
illustration only. FIG. 14 does not limit the scope of this
disclosure to any particular implementation. As shown in FIG. 14,
RI, CQI, and I are combined as Part 1 (e.g., UCI part 1) in step
1401. Wideband PMI is transmitted as Part 2 (e.g., UCI part 2) in
step 1402. Subband PMI is transmitted as Part 3 (e.g., UCI part 2)
in step 1403. In step 1404, the number of bits (P1) in Part 1, the
number of bits (P2) in Part 2, and the number of bits (P3) in Part
3 are added to each other. In step 1405, a total number of bits
(P=P1+P2+P3) is compared with a number of bits B. If P is greater
than B, P1+P2 is compared with B in step 1406. If P1+P2 is greater
than B in step 1406, the UCI part 1 is only transmitted, otherwise,
the UCI part 1 and part 2 are transmitted. In step 1405, if B is
less than or equal to P, the UCI part 1, 2, and 3 are
transmitted.
[0346] In one embodiment of scheme 2B-12, an example of which is
illustrated in FIG. 14, for the three-part UCI design where the
first part includes information such as RI, CQI, and, optionally,
an indicator (1) about the WB amplitudes, if the UE finds that the
total CSI payload (the number of UCI information bits associated
with the CSI report) exceeds the number of bits that can be
accommodated within the PUSCH resources for UCI transmission
(either explicitly or implicitly allocated to the UE) or,
optionally, exceeds a certain threshold (either fixed or
configured), the UE does not transmit the third UCI part, otherwise
the UE transmits all three parts. If the total CSI payload after
the removal of the third part still exceeds the number of bits that
can be accommodated within the PUSCH resources for UCI transmission
(either explicitly or implicitly allocated to the UE), the UE
transmits only the first part (and not the second and third parts),
otherwise the UE transmits UCI part 1 and 2. The indicator (1) is
according to at least one of the alternatives in Scheme 1B-10.
[0347] In a variation of scheme 2B-12, the first part does not
include RI, and comprises CQI and the indicator I. RI is not
reported explicitly, but derived using the indicator I.
[0348] FIG. 15 illustrates another example three-part UCI design
1500 according to embodiments of the present disclosure. The
embodiment of the three-part UCI design 1500 illustrated in FIG. 15
is for illustration only. FIG. 15 does not limit the scope of this
disclosure to any particular implementation. As shown in FIG. 15,
RI, CQI, and I are combined as Part 1 (e.g., UCI part 1) in step
1501. Wideband PMI is transmitted as Part 2 (e.g., UCI part 2) in
step 1502. Subband PMI is transmitted as Part 3 (e.g., UCI part 2)
in step 1503. In step 1504, the number of bits (P1) in Part 1, the
number of bits (P2) in Part 2, and the number of bits (P3) in Part
3 are added to each other. In step 1505, a total number of bits
(P=P1+P2+P3) is compared with a number of bits B. If P is greater
than B, P1+P2 is compared with B in step 1506. If P1+P2 is greater
than B in step 1506, the UCI Part 1 is transmitted, and UCI Part 2
and 3 are rate-matched and then transmitted in step 1507. In step
1506, B is less than or equal to P1+P2, the UCI Part 1 and Part 2
are transmitted, and UCI Part 3 is rate-matched and then
transmitted. In step 1505, B is less than or equal to P, the UCI
part 1, 2, and 3 are transmitted.
[0349] In one embodiment of scheme 2B-13, an example of which is
illustrated in FIG. 15, for three-part UCI design where the first
part includes information such as RI, CQI, and, optionally, an
indicator (1), if the UE finds that the total CSI payload (the
number of UCI information bits associated with the CSI report)
exceeds the number of bits (e.g. X) that can be accommodated within
the PUSCH resources for UCI transmission (either explicitly or
implicitly allocated to the UE) or, optionally, exceeds a certain
threshold (either fixed or configured), but the CSI payload for
part 1 and part 2 does not exceed B, then the UE transmits UCI part
1 and UCI part 2 as is.
[0350] In addition, the UE performs rate matching to the third UCI
part. This can be done, for instance, by increasing the channel
coding rate, or partially puncturing or selecting the output of the
channel encoder (e.g. Polar encoder), or by adjusting the
modulation-coding-scheme (MCS) and/or beta offset factor used by
the second UCI part. This rate matching can include no transmission
(complete puncturing) as a special case, if the payload associated
with the third UCI part is too large compared to a certain
threshold.
[0351] If the CSI payload for part 1 and part 2 exceeds B, then the
UE transmits the UCI part 1 as is. In addition, the UE performs
rate matching to the second and the third UCI parts. This can be
done, for instance, by increasing the channel coding rate, or
partially puncturing or selecting the output of the channel encoder
(e.g. Polar encoder), or by adjusting the modulation-coding-scheme
(MCS) and/or beta offset factor used by the second UCI part. This
rate matching can include no transmission (complete puncturing) as
a special case, if the payload associated with the second or/and
third UCI parts is too large compared to a certain threshold. The
indicator (1) is according to at least one of the alternatives in
Scheme 1B-10.
[0352] In a variation of scheme 2B-13, the first part does not
include RI, and comprises CQI and the indicator I. RI is not
reported explicitly, but derived using the indicator I.
[0353] In one embodiment of scheme 2B-14, as an example of scheme
1B-12, the multiple encoded parts correspond to three parts, part
1, part 2, and part 3 (or first part or second part or third part)
where part 1 corresponds to the highest priority part, part 2
corresponds to the medium priority part, and part 3 corresponds to
the lowest priority part. The CSI content of three parts is
according to Scheme 2B-12 or 2B-13, including the variation wherein
the first part does not include RI, and comprises CQI and the
indicator I; RI is not reported explicitly, but derived using the
indicator I.
[0354] The lower priority part(s) (part 2 or/and part 3) is/are
transmitted in full (i.e. all CSI components are transmitted for
all SBs) when RI=1 is transmitted in the highest priority part
(part 1), and can be transmitted partially (according to at least
one of Alt 1B-12a, 12b, 12c, or 12d) or not transmitted when RI=2
is transmitted in the higher priority part (part 1). The CQI
transmission in part 1 is according to at least one alternative in
Scheme 1B-12. The information whether the lower priority part(s)
(part 2 or/and part 3) is/are transmitted (A) fully for all SBs or
(B) partially for a subset of SBs or (C) dropped (not reported) for
all SBs is determined according to at least one of the alternatives
in scheme 1B-12.
[0355] In one embodiment of 2X, scheme 2B-12 of embodiment 2 is
extended to general three-part UCI design including the cases of
single component carrier (CC) or multiple CCs when carrier
aggregation (CA) is configured. In particular, the UCI comprises
three parts, a first UCI part for a first CSI part, a second UCI
part for a second CSI part, and a third UCI part for a third CSI
part, where CSI corresponds to one CC or multiple CCs. If the UE
finds that the total CSI payload (the number of UCI information
bits associated with the CSI report) exceeds the number of bits
that can be accommodated within the PUSCH resources for UCI
transmission (either explicitly or implicitly allocated to the UE)
or, optionally, exceeds a certain threshold (either fixed or
configured), the UE does not transmit the third UCI part, otherwise
the UE transmits all three parts.
[0356] If the total CSI payload after the removal of the third part
still exceeds the number of bits that can be accommodated within
the PUSCH resources for UCI transmission (either explicitly or
implicitly allocated to the UE), the UE transmits only the first
part (and not the second and third parts), otherwise the UE
transmits UCI part 1 and 2.
[0357] In one embodiment of 2Y, scheme 2B-13 of embodiment 2 is
extended to general three-part UCI design including the cases of
single component carrier (CC) or multiple CCs when carrier
aggregation (CA) is configured. In particular, the UCI comprises
three parts, a first UCI part for a first CSI part, a second UCI
part for a second CSI part, and a third UCI part for a third CSI
part, where CSI corresponds to one CC or multiple CCs. If the UE
finds that the total CSI payload (the number of UCI information
bits associated with the CSI report) exceeds the number of bits
(e.g. X) that can be accommodated within the PUSCH resources for
UCI transmission (either explicitly or implicitly allocated to the
UE) or, optionally, exceeds a certain threshold (either fixed or
configured), but the CSI payload for part 1 and part 2 does not
exceed B, then the UE transmits UCI part 1 and UCI part 2 as
is.
[0358] In addition, the UE performs rate matching to the third UCI
part. This can be done, for instance, by increasing the channel
coding rate, or partially puncturing or selecting the output of the
channel encoder (e.g. Polar encoder), or by adjusting the
modulation-coding-scheme (MCS) and/or beta offset factor used by
the second UCI part. This rate matching can include no transmission
(complete puncturing) as a special case, if the payload associated
with the third UCI part is too large compared to a certain
threshold.
[0359] If the CSI payload for part 1 and part 2 exceeds B, then the
UE transmits the UCI part 1 as is. In addition, the UE performs
rate matching to the second and the third UCI parts. This can be
done, for instance, by increasing the channel coding rate, or
partially puncturing or selecting the output of the channel encoder
(e.g. Polar encoder), or by adjusting the modulation-coding-scheme
(MCS) and/or beta offset factor used by the second UCI part. This
rate matching can include no transmission (complete puncturing) as
a special case, if the payload associated with the second or/and
third UCI parts is too large compared to a certain threshold.
[0360] In one embodiment 2Z, scheme 2B-14 of embodiment 2 is
extended to general three-part UCI design including the cases of
single component carrier (CC) or multiple CCs when carrier
aggregation (CA) is configured. In particular, the UCI comprises
three parts, a first UCI part for a first CSI part, a second UCI
part for a second CSI part, and a third UCI part for a third CSI
part, where CSI corresponds to one CC or multiple CCs. If the UE
finds that the total CSI payload (the number of UCI information
bits associated with the CSI report) exceeds the number of bits
(e.g. X) that can be accommodated within the PUSCH resources for
UCI transmission (either explicitly or implicitly allocated to the
UE) or, optionally, exceeds a certain threshold (either fixed or
configured), but the CSI payload for part 1 and part 2 does not
exceed B, then the UE transmits UCI part 1 and UCI part 2 as
is.
[0361] In addition, the UE transmits the third UCI part either
partially or drops the third UCI part (does not transmit the third
UCI part) (based on at least one of the alternatives in scheme
1B-12). The information whether the third UCI part is reported (A)
fully for all SBs or (B) partially for a subset of SBs or (C)
dropped (not reported) for all SBs is determined according to at
least one of the alternatives in scheme 1B-12.
[0362] If the CSI payload for part 1 and part 2 exceeds B, then the
UE transmits the UCI part 1 as is. In addition, the UE transmits at
least one of the second and the third UCI parts either partially or
drops the third UCI part (does not transmit the third UCI part)
(based on at least one of the alternatives in scheme 1B-12). The
information whether at least one of the second and the third UCI
parts is reported (A) fully for all SBs or (B) partially for a
subset of SBs or (C) dropped (not reported) for all SBs is
determined according to at least one of the alternatives in scheme
1B-12.
[0363] In a variation of embodiment 2Z, the partial UCI part 2
or/and part 3 transmission in a three-part UCI design for
K.gtoreq.1 CSI reports (e.g. CSI reports for K CCs or cells) is
according to an extension of at least one of the alternatives (Alt
1Z-0 through Alt 1Z-21) in embodiment 1Z.
[0364] Some alternatives for PMI part I, PMI part II, and PMI part
III included in codeword segment 1, codebook segment 2, and
codeword segment 3, respectively, in Scheme 2/Scheme 2A/Scheme 2B
above can be described as follows.
[0365] In a first sub-embodiment of Scheme 2, the three-part UCI
multiplexing is used wherein CQI, RI, and PMI part I (indicating L
beams) are multiplexed and encoded together in part I, WB amp 1
and/or WB amp 2 (included only if RI=2, otherwise only WB amp 1
included) in part II. The remaining parameters (SB amp 1, SB amp 2,
SB phase 1, and SB phase 2) are multiplexed in part III.
[0366] In a second sub-embodiment of Scheme 2, the three-part UCI
multiplexing is used wherein CQI, RI, PMI part I (indicating L
beams), and WB amp 1 are multiplexed and encoded together in part
I, WB amp 2 (included only if RI=2, otherwise nothing is included)
in part II. The remaining parameters (SB amp 1, SB amp 2, SB phase
1, and SB phase 2) are multiplexed in part III.
[0367] In a third sub-embodiment of Scheme 2, the three-part UCI
multiplexing is used wherein CQI and RI are multiplexed and encoded
together in part I, PMI part I (indicating L beams), WB amp 1
and/or WB amp 2 (included only if RI=2, otherwise only WB amp 1
included) in part II. The remaining parameters (SB amp 1, SB amp 2,
SB phase 1, and SB phase 2) are multiplexed in part III.
[0368] In a fourth sub-embodiment of Scheme 2, the three-part UCI
multiplexing is used wherein CQI and RI, and WB amp 1 are
multiplexed and encoded together in part I, PMI part I (indicating
L beams) and WB amp 2 (included only if RI=2, otherwise nothing is
included) in part II. The remaining parameters (SB amp 1, SB amp 2,
SB phase 1, and SB phase 2) are multiplexed in part III.
[0369] In the aforementioned embodiments on Type II CSI reporting,
the PMI part I (i.sub.1) indicates L beams which comprises the
following two components: the rotation factor (q.sub.1,q.sub.2)
where q.sub.1, q.sub.2.di-elect cons.{0, 1, 2, 3}, which
corresponds to 16 combinations (hence requires 4-bits reporting);
and the selection of L orthogonal beams, which is either joint,
.left brkt-top.log.sub.2.sup.N.sup.1.sub.L.sup.N.sup.2.right
brkt-bot. bits, or independent per beam, L.left
brkt-top.log.sub.2(N.sub.1N.sub.2).right brkt-bot. bits. The two
components are reported either jointly or separately as two
components of PMI part I.
[0370] In the above embodiments on Type II CSI reporting, the WB
amp 1 and WB amp 2 can also be referred to as RPI.sub.0 and
RPI.sub.1 where RPI stands for relative power indicator, and
RPI.sub.0 indicates the strongest/leading coefficient for the first
layer and WB amplitudes p.sub.0,0.sup.(WB), . . . ,
p.sub.0,2L-2.sup.(WB) of remaining 2L-1 coefficients for the first
layer, and RPI.sub.1 indicates the strongest/leading coefficient
for the second layer and WB amplitudes p.sub.1,0.sup.(WB), . . . ,
p.sub.1,2L-2.sup.(WB) of remaining 2L-1 coefficients for the second
layer.
[0371] The strongest/leading coefficients for the first layer and
second layer can also refer to as SCI.sub.0 and SCI.sub.1, SCI
stands for strongest coefficient indicator. In a variation,
SCI.sub.0 and SCI.sub.1 can also be reported separately from WB
amplitudes for the two layers. In this case, RPI.sub.0 and
RPI.sub.1 indicate the WB amplitude of the remaining 2L-1
coefficients for the two layers.
[0372] In the aforementioned embodiments on Type II CSI reporting,
the SB amp 1 and SB amp 2 can also be referred to as SRPI.sub.0 and
SRPI.sub.1 where SRPI stands for subband relative power indicator,
and SRPI.sub.0 indicates the SB amplitudes p.sub.0,0.sup.(SB), . .
. , p.sub.0,2L-2.sup.(SB) of remaining 2L-1 coefficients for the
first layer, and SRPI.sub.1 indicates the SB amplitudes
p.sub.1,0.sup.(SB), . . . , p.sub.1,2L-2.sup.(SB) of remaining 2L-1
coefficients for the second layer.
[0373] Component 3--Wideband CSI on PUSCH
[0374] In embodiment 3, a wideband or partial-band CSI (one CSI for
all the subbands in the CSI reporting band) is reported on PUSCH
according to at least one of the following two alternatives.
[0375] In one example of Alt 3A, the WB or partial-band CSI is
reported such that the information payload remains the same
irrespective of the reported RI/CRI in a given slot (to avoid blind
decoding by the UE). Note that the size of information payload can
be different according to the largest number of CSI-RS ports of the
CSI-RS resources configured within a CSI-RS resource set. Two
examples to ensure the same payload size are as follows: when PMI
and CQI payload size varies with RI/CRI, padding bits are added to
RI/CRI/PMI/CQI prior to encoding to equalize the payload associated
with different RI/CRI values; and RI/CRI/PMI/CQI, along with
padding bits when necessary, is jointly encoded.
[0376] In one example of Alt 3B, the two-part UCI design according
to some of the embodiments of the present disclosure is still used.
As an example, the WB CQI is reported in UCI part 1 and WB or SB
PMI is reported in UCI part 2.
[0377] In one example of Alt 3C, the three-part UCI design
according to some of the embodiments of the present disclosure is
still used. As an example, the WB CQI is reported in UCI part 1 and
WB or SB PMI is reported in UCI part 2 and part 3.
[0378] In one embodiment 4, which is a variation of embodiment 3,
when a UE is scheduled to transmit UL data using PUSCH in a slot n,
and UCI carrying wideband or partial band CSI is also scheduled to
be transmitted using (short or long) PUCCH in the same slot (n),
then the UE piggybacks/reports UCI carrying wideband or partial
band CSI on PUSCH (not on PUCCH). This can be used, for instance,
when simultaneous/concurrent reception of PUSCH and PUCCH is not
configured. At least one of the following alternatives is used to
piggyback/report UCI on PUSCH.
[0379] In one example of Alt 4-0, UCI is transmitted as a single
UCI without any padding (for example, zero padding) bits to
maintain the number of CSI (CRI/RI/PMI/CQI) information bits to a
fixed value, and therefore, the CSI information bits piggybacked on
PUSCH can potentially change, for example, depending on the
reported CRI/RI value. In addition, if PUSCH resource allocation is
such that the PUSCH resource allocation can accommodate two-part
UCI transmission (UCI part 1 and UCI part 2, as explained in some
embodiments of the present disclosure), then at least one of the
following sub-alternatives is used.
[0380] In one example of Alt 4-0-0, the wideband or partial band
CSI is transmitted using UCI part 1, and UCI part 2 is not used to
transmit any CSI.
[0381] In one example of Alt 4-0-1, the wideband or partial band
CSI is transmitted using UCI part 2, and UCI part 1 is not used to
transmit any CSI.
[0382] In a variation of this alternative (Alt 4-0A), all of the
reported wideband or partial band CSI parameters are jointly
encoded into one codeword. This codeword, after code block (CB) CRC
insertion (or potentially CB segmentation), is an input to a
channel coding block. In another variation (Alt 4-0B), a CRC is not
added when the codeword segment is short (e.g. less than a fixed
number of bits).
[0383] In Alt 4-1, UCI is transmitted as a single UCI with padding
(for example, zero padding) bits to maintain the number of CSI
(CRI/RI/PMI/CQI) information bits to a fixed value. At least one of
the following alternatives is used to insert padding (for example,
zero padding) bits with the CSI bits.
[0384] In one example of Alt 4-1-0, padding (for example, zero
padding) bits is inserted in between the bits for CRI/RI and
PMI/CQI. For example, CRI bits is followed by RI bits, which is
followed by padding (for example, zero padding) bits, which is
followed by PMI bits, which in turn is followed by CQI bits, i.e.,
CRI.fwdarw.RI.fwdarw.padding bits.fwdarw.PMI.fwdarw.CQI, where CRI
bits correspond to either least significant bits (LSBs) or most
significant bits (MSBs).
[0385] In one example of Alt 4-1-1, padding (for example, zero
padding) bits is inserted in the end. For example, CRI bits is
followed by RI bits, which is followed by PMI bits, which in turn
is followed by CQI bits, which is followed by padding (for example,
zero padding) bits, i.e.,
CRI.fwdarw.RI.fwdarw.PMI.fwdarw.CQI.fwdarw.padding bits, where CRI
bits correspond to either least significant bits (LSBs) or most
significant bits (MSBs).
[0386] In one example of Alt 4-1-2, padding (for example, zero
padding) bits is inserted in the beginning. For example, zero
padding bits is followed by CRI, which is followed by RI bits,
which is followed by PMI bits, which in turn is followed by CQI
bits, i.e., padding
bits.fwdarw.CRI.fwdarw.RI.fwdarw.PMI.fwdarw.CQI, where padding bits
correspond to either least significant bits (LSBs) or most
significant bits (MSBs)
[0387] In addition, if PUSCH resource allocation is such that the
PUSCH resource allocation can accommodate two-part UCI transmission
(UCI part 1 and UCI part 2, as explained in some embodiments of the
present disclosure), then at least one of the following
sub-alternatives is used.
[0388] In one example of Alt 4-1-3, the wideband or partial band
CSI is transmitted using UCI part 1, and UCI part 2 is not used to
transmit any CSI.
[0389] In one example of Alt 4-1-4, the wideband or partial band
CSI is transmitted using UCI part 2, and UCI part 1 is not used to
transmit any CSI.
[0390] In a variation of this alternative (Alt 4-1A), all of the
reported wideband or partial band CSI parameters (including the
padding bits) are jointly encoded into one codeword. This codeword,
after code block (CB) CRC insertion (or potentially CB
segmentation), is an input to a channel coding block. In another
variation (Alt 4-1B), a CRC is not added when the codeword segment
is short (e.g. less than a fixed number of bits).
[0391] In Alt 4-2, wideband or partial band CSI is partitioned into
two parts (CSI part 1 and CSI part 2) and UCI part 1 and UCI part 2
are used to transmit CSI part 1 and CSI part 2, respectively. The
CSI part 1 and CSI part 2 are determined according to at least one
embodiment of the present disclosure. For example, CSI part 1
comprises CRI, RI, 1.sup.st CQI; and CSI part 2 comprises PMI,
2.sup.st CQI (if RI>4 is reported).
[0392] In a variation of this alternative (Alt 4-2A), all of the
reported wideband or partial band CSI parameters for CSI part 1 are
jointly encoded into one codeword (e.g. codeword segment 1), and
all of the reported wideband or partial band CSI parameters for CSI
part 2 are jointly encoded into another codeword (e.g. codeword
segment 2). Either the codeword segment 1, after code block (CB)
CRC insertion (or potentially CB segmentation), is an input to a
channel coding block, or the codeword segment 2, after code block
(CB) CRC insertion (or potentially CB segmentation), is an input to
a channel coding block, or both the codeword segment 1 and codeword
segment 2, after code block (CB) CRC insertion (or potentially CB
segmentation), are inputs to the respective channel coding blocks.
In another variation (Alt 4-2B), a CRC is not added when at least
one of the codeword segment 1 or codeword segment 2 is short (e.g.
less than a fixed number of bits).
[0393] If the wideband or partial band CSI includes the strongest
layer indicator (LI), then embodiment 4 and example alternatives
(Alt 4-0, 4-1, or/and 4-2) can be extended to include LI in
addition to other CSI parameters (CRI/RI/PMI/CQI). In particular,
LI bits can be in the beginning, hence, followed by CRI bits (e.g.
LI.fwdarw.CRI.fwdarw.RI.fwdarw. . . . ). Or, LI bits can be in the
end, hence, followed by CQI (e.g . . .
.fwdarw.PMI.fwdarw.CQI.fwdarw.LI). Or, LI bits can be in between RI
and PMI bits (e.g . . . .fwdarw.RI.fwdarw.LI.fwdarw.PMI.fwdarw. . .
. ).
[0394] Component 4--Aperiodic Beam Reporting on PUSCH
[0395] FIG. 16 illustrates an example multi-beam based system 1600
according to embodiments of the present disclosure. The embodiment
of the multi-beam based system 1600 illustrated in FIG. 16 is for
illustration only. FIG. 16 does not limit the scope of this
disclosure to any particular implementation.
[0396] The future cellular systems (such as 5G) are expected to be
a multi-beam based system. In such a system, multiple beams are
used to cover one coverage area. An example for illustration is
shown in FIG. 16. As shown, one gNB has one or more TRPs. Each TRP
uses one or more analog or radio frequency (RF) beams to cover some
area. To cover one UE in one particular area, the gNB uses one or
more analog beams to transmit and receive the signal to and from
that UE. The gNB and the UE need to determine the beam(s) used for
their connection. When the UE moves within one cell coverage area,
the beam(s) used for this UE may be changed and switched. The
operation of managing those beams are radio access network layer 1
(L1) and layer 2 (L2) operation.
[0397] For instance, the following L1/L2 beam management procedures
are used. In one example of P-1, the L1/L2 beam management
procedures are used to enable UE measurement on different TRP TX
beams to support selection of TRP TX beams/UE Rx beam(s). In such
example, for beamforming at TRP, the L1/L2 beam management
procedures typically include an intra/inter-TRP TX beam sweep from
a set of different beams. For beamforming at UE, the L1/L2 beam
management procedures typically include a UE Rx beam sweep from a
set of different beams.
[0398] In one example of P-2, the L1/L2 beam management procedures
are used to enable UE measurement on different TRP TX beams to
possibly change inter/intra-TRP TX beam(s). In such example, from a
possibly smaller set of beams for beam refinement than in P-1. Note
that P-2 can be a special case of P-1.
[0399] In one example of P-3, the L1/L2 beam management procedures
are used to enable UE measurement on the same TRP TX beam to change
UE Rx beam in the case UE uses beamforming.
[0400] In the present disclosure, a "beam" can correspond to an RS
resource, whether the beam is a sounding reference signal (SRS),
CSI-RS, beam RS, measurement RS, or any other type of RS.
[0401] In high frequency band system (e.g., >6 GHz system), the
TRP and the UE can be deployed with large number of antennas to
relay on the high gain beamforming to defeat the large path loss
and signal blockage. A general system configuration is that the TRP
and UE have large number antennas but only one or a few TXRUs. So
hybrid beamforming mechanism is utilized wherein both analog (RF)
and digital (baseband) beamforming are utilized for transmission.
Analog beams with different direction can be formulated on the
antenna array that is connected to one TXRU.
[0402] To get the best link quality and coverage distance, the TRP
and UE need to align the analog beam directions for each particular
downlink and uplink transmission. An example mechanism to align
analog beams (e.g. for DL) includes multiple RS transmission from
the gNB where each RS corresponds to an analog beam, and at least
one RS reporting from the UE. In one example, the RS corresponds to
CSI-RS, and the UE reports one or more CRI to indicate analog
beam(s) selection. In another example, the RS corresponds to
SS/PBCH, and the UE reports one of more SSB resource indicator or
SS/PBCH block resource indicator (SSBRI). In addition to the
resource indicator (CRI or SSBRI), the UE also reports the quality
of the reported beams in the form of layer 1 reference signal
received power (L1-RSRP). If multiple (N>1) CRI or SSBRI are
reported, then the corresponding L1-RSRP can be reported
differentially wherein B1 bits are used to report one L1-RSRP and
B2 bits are used to report each of the remaining (N-1) differential
L1-RSRPs. An example of B1 is 7. An example of B2 is 4.
[0403] In the present disclosure, the schemes of beam reporting,
i.e., CRI or SSBRIS together with L1-RSRP, are provided. In
particular, aperiodic beam reporting on PUSCH is considered.
[0404] In CSI configuration framework, the UE can be configured
with higher layer parameter ReportQuantity set to be "CRI/RSRP" or
"SSBRI/RSRP". When the UE is configured with "CRI/RSRP", the UE can
be requested to report N different CRIs and their corresponding
L1-RSRP based one measuring K configured CSI-RS resources. An
example of K value is 16, 32 or 64. When the UE is configured with
"SSBRI/RSRP", the UE can be requested to report N different SSBRIs
and their corresponding L1-RSRP values. The example of N can be 1,
2, 3, and 4
[0405] For aperiodic CRI/RSRP and SSBRI/RSRP reporting, UL channel
PUSCH can be used, or, optionally, UL channel long PUCCH or short
PUCCH can be used. In short PUCCH channel, PUCCH format 2 can be
used for aperiodic CRI/RSRP and SSBRI/RSRP reporting. In long PUCCH
channel, PUCCH format 3 and 4 can be used for aperiodic CRI/RSRP
and SSBRI/RSRP reporting.
[0406] In one embodiment 4, the aperiodic beam reporting is
triggered and/or configured for a UE according to at least one of
the following reporting schemes. If multiple schemes are supported
in the specification, then one of the multiple scheme is configured
to the UE (e.g. via higher layer RRC or MAC CE based or DCI based
signaling).
[0407] In one embodiment of scheme 4A, the UE is triggered to
transmit/report aperiodic beam report comprising N reported CRIs or
SSBRIs and their corresponding N L1-RSRP and differential L1-RSRPs
on PUSCH (or short PUCCH or long PUCCH) in one part (using a single
UCI segment) regardless of the value of N. The UE can determine the
bit size of beam report payload size for a given value of N.
[0408] If the bit size of beam report payload is less than or equal
to that can be accommodated in a single UCI (based on RA), the UE
can transmit/report the whole beam report with N selected CRIs or
SSBRIs and their corresponding N L1-RSRP and differential L1-RSRPs
in one part using a single UCI segment.
[0409] Otherwise, (or If the bit size of beam report payload is
larger than that can be accommodated in a single UCI), the UE can
report only a subset of the beam report with N selected CRIs or
SSBRIs and their corresponding N L1-RSRP and differential L1-RSRP.
The subset the UE can report can be one of the following.
[0410] In one example of Alt 4.1, the M CRIs or SSBRIs of N CRIs or
SSBRIs with the largest L1-RSRP. M can be the largest number of
that the bit size of report with M CRIs or SSBRIs and M
L1-RSRP/differential L1-RSRP is no more than that can be
accommodated in one part (of the single UCI segment).
[0411] In one example of Alt 4.2, the subset (M out of N) is
reported by the UE, The UE can also report which subset is
reported. In one example, an additional signaling with
log 2 ( N M ) ##EQU00009##
bits can be signaled from the UE to indicate which subset is
reported.
[0412] In one example of Alt 4.3, the subset is configured to the
UE, for example, via higher layer (RRC) or more dynamic MAC CE
based or DCI based signaling.
[0413] In a variation of scheme 4A, the UE determines the
transmission behavior based on achieved code rate that is
calculated by assuming the whole beam report payload with N
CRIs/SSBRIs is sent in one part using a single UCI. If the achieved
code rate is less than (or equal to) some threshold, the UE can
transmit and report the whole beam report with N CRIs or SSBRIs and
their corresponding N L1-RSRP/differential L1-RSRP in one part
(using a single UCI segment). If the achieved code rate is larger
than some threshold, the UE can only transmit a subset of the beam
report with those N selected CRIs/SSBRIs and their corresponding
L1-RSRP/differential L1-RSRP. The selection of a subset can be
according one of the alternatives described above. In an example,
the threshold is determined based on the coding rate (c.sub.MCS)
and the beta_offset (.beta..sub.offset) configured for the UCI
transmission,
e . g . c T = c MCS .beta. offset . ##EQU00010##
[0414] In one embodiment of scheme 4B, the UE is triggered to
transmit/report aperiodic beam report comprising N reported CRIs or
SSBRIs and their corresponding N L1-RSRP and differential L1-RSRPs
on PUSCH (or short PUCCH or long PUCCH) in 1 or 2 parts (using 1 or
2 UCI segments). The UE determines whether to transmit one beam
report in one or two parts based on the information of bit size of
beam report payload size. If the bit size of beam report payload is
large, the UE partitions the beam report contents into two parts
and transmit these two parts using two UCI segments. If the bit
size of beam report payload is small, the UE transmits the whole
content of one beam report instance with N reported CRIs or SSBRIs
and their corresponding N L1-RSRPs in one part using one UCI
segment.
[0415] Alternatively, the UE determines whether to transmit one
beam report in one or two parts based on the value N. If N>A,
where A is a fixed value (e.g. A=2), the UE partitions the beam
report contents into two parts and transmit these two parts using
two UCI segments. If N<=A, the UE transmits the whole content of
one beam report instance with N reported CRIs or SSBRIs and their
corresponding N L1-RSRPs in one part using one UCI segment.
Alternatively, the UE determines whether to transmit one beam
report in one or two parts based on the achieved code rate, for
example, by comparing the code rate with a fixed threshold as
explained in scheme 4A.
[0416] In one embodiment of scheme 4C, the UE is triggered to
transmit/report aperiodic beam report comprising N reported CRIs or
SSBRIs and their corresponding N L1-RSRP and differential L1-RSRPs
on PUSCH (or short PUCCH or long PUCCH) in 1, 2, . . . , or, M
parts (using 1, 2, . . . , or M UCI segments), where the value M is
fixed and is determined based on a fixed condition such as the
value N, bit size of the beam report, achieved code rate etc. as
explained in scheme 4B.
[0417] In one example of Definition of Collision, a beam report and
a CSI report or two CSI reports are said to collide if the time
occupancy of the physical channels scheduled to carry the CSI
reports overlap in at least one OFDM symbol and are transmitted on
the same carrier.
[0418] In one embodiment 5, when aperiodic beam report (according
to schemes of embodiment 4) collides with aperiodic CSI report
(according to schemes in embodiments 1/2/3), then at least one of
the following reporting schemes is used. If multiple schemes are
supported in the specification, then one of the multiple schemes is
configured to the UE (e.g. via higher layer RRC or MAC CE based or
DCI based signaling).
[0419] In one embodiment of scheme 5A, at least one of the
aperiodic beam report or aperiodic CSI report, either fully or
partially, is dropped (not reported) whenever collide. At least one
of the following alternatives is use for dropping.
[0420] In one example of Alt 5A-0, the aperiodic CSI report is
dropped.
[0421] In one example of Alt 5A-1, the aperiodic beam report is
dropped.
[0422] In one example of Alt 5A-2, this is configured (via higher
later RRC or MAC CE based or DCI based signaling) with which of the
two (aperiodic beam report or aperiodic CSI report) is dropped.
[0423] In one example of Alt 5A-3, when CSI is expected to be
reported in two parts (CSI part 1 and CSI part 2) using two UCI
segments (if the CSI does not collide with beam report) and beam is
reported in one part, then at least one of the following
sub-alternatives is used.
[0424] In one example of Alt 5A-3-0, CSI part 1 and beam report are
reported in two parts using UCI segment 1 and 2, respectively, and
CSI part 2 is dropped.
[0425] In one example of Alt 5A-3-1, CSI part 2 and beam report are
reported in two parts using UCI segment 1 and 2, respectively, and
CSI part 1 is dropped.
[0426] In one example of Alt 5A-3-2, CSI part 1 and CSI part 2 are
reported in two parts using UCI segment 1 and 2, respectively, and
beam report is dropped.
[0427] In one example of Alt 5A-4, when beam is expected to be
reported in two parts (beam report part 1 and beam report part 2)
using two UCI segments (if the beam did not collide with CSI
report), then at least one of the following sub-alternatives is
used.
[0428] In one example of Alt 5A-4-0, beam report part 1 and CSI
report are reported in two parts using UCI segment 1 and 2,
respectively, and beam report part 2 is dropped.
[0429] In one example of Alt 5A-4-1, beam report part 2 and CSI
report are reported in two parts using UCI segment 1 and 2,
respectively, and beam report part 1 is dropped.
[0430] In one example of Alt 5A-4-2, beam report part 1 and beam
report part 2 are reported in two parts using UCI segment 1 and 2,
respectively, and CSI report is dropped.
[0431] In one example of Alt 5A-5, when CSI is expected to be
reported in two parts (CSI part 1 and CSI part 2) using two UCI
segments (if the CSI did not collide with beam report), and beam is
expected to be reported in two parts (beam report part 1 and beam
report part 2) using two UCI segments (if the beam did not collide
with CSI report), then at least one of the following
sub-alternatives is used.
[0432] In one example of Alt 5A-5-0, CSI part 1 and beam report
part 1 are reported in two parts using UCI segment 1 and 2,
respectively, and CSI part 2 and beam report part 2 are
dropped.
[0433] In one example of Alt 5A-5-1, CSI part 1 and CSI part 2 are
reported in two parts using UCI segment 1 and 2, respectively, and
beam report part 1 and beam report part 2 are dropped.
[0434] In one example of Alt 5A-5-2, beam report part 1 and beam
report part 2 are reported in two parts using UCI segment 1 and 2,
respectively, and CSI part 1 and CSI part 2 are dropped. When CSI
part 2 is transmitted partially, (according to some embodiment of
the present disclosure), then alternatives in scheme 5A can be
extended to include partial transmission of CSI part 2.
[0435] In one embodiment of scheme 5B, both aperiodic beam report
and aperiodic CSI report are multiplexed and reported according to
at least one of the following alternatives.
[0436] In one example of Alt 5B-0, both CSI report and beam report
are multiplexed and reported in one part as a single UCI
segment.
[0437] In one example of Alt 5B-1, CSI report is reported in one
part as UCI segment 1 and beam report is reported in one part as
UCI segment 2. Note that when CSI and beam report do not collide,
then each one of the CSI and beam report is reported in one part as
a single UCI segment. In other words, CSI report and beam report
are reported using two UCI segments only when the CSI report and
beam report collide, otherwise the CSI report and beam report are
reported using one UCI segment. Also, the presence of UCI segment 2
can be indicated in UCI segment 1 by using 1-bit signaling or via
higher layer (e.g. RRC) or dynamic DCI based signaling.
[0438] In one example of Alt 5B-2, same as Alt 5B-1 except that CSI
report is reported in one part as UCI segment 2 and beam report is
reported in one part as UCI segment 1.
[0439] In one example of Alt 5B-3, when CSI is expected to be
reported in two parts (CSI part 1 and CSI part 2) using two UCI
segments (if the CSI did not collide with beam report) and beam is
reported in one part, then at least one of the following
sub-alternatives is used.
[0440] In one example of Alt 5B-3-0, CSI part 1 and beam report are
multiplexed and reported in one part using UCI segment 1, and CSI
part 2 is reported in one part using UCI segment 2.
[0441] FIG. 17 illustrates an example beam report 1700 according to
embodiments of the present disclosure. The embodiment of the beam
report 1700 illustrated in FIG. 17 is for illustration only. FIG.
17 does not limit the scope of this disclosure to any particular
implementation.
[0442] In one example of Alt 5B-3-1, CSI part 2 and beam report are
multiplexed and reported in one part using UCI segment 2, and CSI
part 1 is reported in one part using UCI segment 1. For the case
when CSI part 2 can be transmitted partially based on a priority
order (cf. FIG. 13) by partitioning CSI part 2 bits into multiple
segments, the beam report can be included (Option 0) in the highest
priority segment (Q0 for WB CSI) as shown in FIG. 17.
Alternatively, the beam report is included separately either before
or after (Option 1 and 2). An illustration is shown in FIG. 17.
[0443] In one example of Alt 5B-4, when beam is expected to be
reported in two parts (beam report part 1 and beam report part 2)
using two UCI segments (if the beam did not collide with beam
report) and CSI report is reported in one part, then at least one
of the following sub-alternatives is used.
[0444] In one example of Alt 5B-4-0, beam report part 1 and CSI
report are multiplexed and reported in one part using UCI segment
1, and beam report part 2 is reported in one part using UCI segment
2.
[0445] In one example of Alt 5B-4-1, beam report part 2 and CSI
report are multiplexed and reported in one part using UCI segment
2, and beam report part 1 is reported in one part using UCI segment
1.
[0446] In one example of Alt 5B-5, when CSI is expected to be
reported in two parts (CSI part 1 and CSI part 2) using two UCI
segments (if the CSI did not collide with beam report), and beam is
expected to be reported in two parts (beam report part 1 and beam
report part 2) using two UCI segments (if the beam did not collide
with CSI report), then at least one of the following
sub-alternatives is used.
[0447] In one example of Alt 5B-5-0, CSI part 1 and beam report
part 1 are multiplexed and reported in one part using UCI segment
1, and CSI part 2 and beam report part 2 are multiplexed and
reported in one part using UCI segment 2. For the case when CSI
part 2 can be transmitted partially based on a priority order (cf.
FIG. 13) by partitioning CSI part 2 bits into multiple segments, at
least one of Option 0-2 in FIG. 17 can be used.
[0448] In one example of Alt 5B-5-1, CSI part 2 and beam report
part 2 are multiplexed and reported in one part using UCI segment
1, and CSI part 1 and beam report part 1 are multiplexed and
reported in one part using UCI segment 2. For the case when CSI
part 2 can be transmitted partially based on a priority order (cf.
FIG. 13) by partitioning CSI part 2 bits into multiple segments, at
least one of Option 0-2 in FIG. 17 can be used.
[0449] Component 5--Multiplexing Periodic/Semi-Persistent Beam
Reporting and A-CSI
[0450] In one embodiment 6, when a periodic beam report collides
with an aperiodic CSI report, then at least one of the following
alternatives is used.
[0451] In one example of Alt 6-0, the periodic beam report is
dropped.
[0452] In one example of Alt 6-1, the periodic beam report is
multiplexed and reported with the aperiodic CSI reported. For
example, at least one of the schemes or/and alternatives of
embodiment 5 can be used.
[0453] In one embodiment 7, when semi-persistent beam report
collides with an aperiodic CSI report, then at least one of the
following alternatives is used.
[0454] In one example of Alt 7-0, the semi-persistent beam report
is dropped.
[0455] In one example of Alt 7-1, the semi-persistent beam report
is multiplexed and reported with the aperiodic CSI reported. For
example, at least one of the schemes or/and alternatives of the
aforementioned embodiment 5 can be used.
[0456] In semi-persistent beam reporting, the UE can receive an
activation message or selection message from higher layer and then
the UE would begin the report beam reporting with N beams (N beam
IDs and their corresponding L1-RSRP or differential L1-RSRP). The
UE can continue reporting periodically until an inactivation
message is received from higher layer. A semi-persistent beam
reporting can be transmitted on PUSCH, long PUCCH and short
PUCCH.
[0457] Component 6: Beam Reporting for MIMO.
[0458] In some embodiments, a UE can be configured with N sets of
CSI-RS resources and there can be one or multiple CSI-RS resources
in each set. The UE can be requested to measure the transmission of
those N sets of CSI-RS resource and then report at least one CSI-RS
resource index selected from every configured set and the
corresponding rank indicator, CQI and/or CSI-RSRP measurement.
[0459] CSI-RS resource is used for exemplary explanation. It can be
any RS type. The CSI-RS resource can be replaced with SS block
without changing any method in this disclosure.
[0460] In one embodiment, a UE can be configured with N (>1)
CSI-RS resource sets. The set n (=1, 2, . . . , N) has K.sub.n
CSI-RS resources. The CSI-RS resources in the set n are {c.sub.n,1,
c.sub.n,2, . . . , c.sub.n,K.sub.n}.
[0461] The UE can be requested to report the following information.
In one example, the UE can be requested to report one CSI-RS
resource index selected from each configured set of n=1, 2, . . . ,
N:{c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . , c.sub.n,i.sub.n},
where c.sub.1,i.sub.1 is one CSI-RS resource index selected from
CSI-RS resource set 1, c.sub.2,i.sub.2 is one CSI-RS resource index
selected from CSI-RS resource set 2, c.sub.n,i.sub.n is one CSI-RS
resource index selected from CSI-RS resource set n for n=1, 2, . .
. , N.
[0462] In one example, the UE can be requested to report a rank
indicator, R.sub.0, corresponding to the reported CSI-RS resource
indices {c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . ,
c.sub.n,i.sub.n}. The UE can be requested to calculate R.sub.0 by
assuming the CSI-RS resources {c.sub.1,i.sub.1, c.sub.2,i.sub.2, .
. . , c.sub.n,i.sub.n} are transmitted through N different TXRUs
from the gNB and the UE uses the same Rx beam to receive.
[0463] In one example, the UE can be requested to report a CQI
value corresponding to the reported CSI-RS resource indices
{c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . , c.sub.n,i.sub.n}. The UE
can be requested to calculate the CQI value by assuming the CSI-RS
resources {c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . ,
c.sub.n,i.sub.n} are transmitted through N different TXRUs from the
gNB.
[0464] In one example, the UE can be requested to report the sum of
the CSI-RSRP of CSI-RS resources {c.sub.1,i.sub.1, c.sub.2,i.sub.2,
. . . , c.sub.n,i.sub.n}.
[0465] In one embodiment, a UE can be configured with N (>1)
CSI-RS resource sets. The set n (=1, 2, . . . , N) has K.sub.n
CSI-RS resources. The CSI-RS resources in the set n are {c.sub.n,1,
c.sub.n,2, . . . , c.sub.n,K.sub.n}. The UE can be also configured
with MIMO transmission mode that the UE may use as criterion to
select CSI-RS index. The MIMO transmission mode configuration
information can be indication of a rank indicator R.sub.1. The UE
can be requested to report.
[0466] In one example, the UE can be requested to report one CSI-RS
resource index selected from each configured set of n=1, 2, . . . ,
N:{c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . , c.sub.n,i.sub.n},
where c.sub.1,i.sub.1 is one CSI-RS resource index selected from
CSI-RS resource set 1, c.sub.2,i.sub.2 is one CSI-RS resource index
selected from CSI-RS resource set 2, c.sub.n,i.sub.n is one CSI-RS
resource index selected from CSI-RS resource set n for n=1, 2, . .
. , N. The rank indicator that the UE calculate based on reported
CSI-RS resource indices {c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . ,
c.sub.n,i.sub.n} maybe not less than configured rand indicator
R.sub.1. The UE can be requested to calculate rank indicator by
assuming the CSI-RS resources {c.sub.1,i.sub.1, c.sub.2,i.sub.2, .
. . , c.sub.n,i.sub.n}, are transmitted through N different TXRUs
from the gNB.
[0467] In one example, the UE can be requested to report a CQI
value corresponding to the reported CSI-RS resource indices
{c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . , c.sub.n,i.sub.n} and
assuming R.sub.1 data streams would be transmitted. The UE can be
requested to calculate the CQI value by assuming the CSI-RS
resources {c.sub.1,i.sub.1, c.sub.2,i.sub.2, . . . ,
c.sub.n,i.sub.n} are transmitted through N different TXRUs from the
gNB.
[0468] In one example, the UE can be requested to report the sum of
the CSI-RSRP of CSI-RS resources {c.sub.1,i.sub.1, c.sub.2,i.sub.2,
. . . , c.sub.n,i.sub.n}.
[0469] Component 7: Beam Reporting for MU-MIMO.
[0470] In some embodiments, a UE can be configured with N sets of
CSI-RS resources and there can be one or multiple CSI-RS resources
in each set. A first group of those N CSI-RS sets can be configured
as serving set and a second group of those N CSI-RS sets can be
configured as interference set. The UE can be requested to measure
the transmission of those N sets of CSI-RS resource and then report
at least one CSI-RS resource index selected from every configured
set and the corresponding rank indicator, CQI and/or CSI-RSRP
measurement by measuring the CSI from CSI-RS resources in the sets
in a first group and measuring interference from CSI-RS resources
in the sets in a second group.
[0471] There can be one or more CSI-RS resource set in a first
group. There can be one or more CSI-RS resource sets in a second
group. The UE can be requested to measure those CSI-RS resources by
assuming that any CSI-RS resource in a first group of sets may be
used for CSI measurement and that any CSI-RS resource in a second
group of sets may be used for interference measurement. The UE can
be requested to report at least one CSI-RS resource selected from
each CSI-RS resource set and a corresponding RI, CQI and/or RSRP,
where the RI and CQI may be calculated by assuming to use the
reported CSI-RS resource selected from a first group of sets as CSI
measurement and the reported CSI-RS resources selected from a
second group of sets as interference measurement. The UE can be
configured with one or more of the following configurations: N sets
of CSI-RS resources. Each set can have one or more CSI-RS
resources.
[0472] The feature definition of each set. It indicate whether the
TX beams carried by the CSI-RS resources in one set is used as
serving beam and the UE can be requested to measure beam quality on
the CSI-RS resources. It indicates whether the TX beams carried by
the CSI-RS resources in one set are used as interference beam and
the UE can be requested to measure if the TX beams can cause
interference to the UE. It can indicate whether the TX beams
carried by the CSI-RS resources in one set can be used as serving
beam or interference beam and the UE can be requested to measure
both beam quality by assuming both beam are serving beam and also
interference level by assuming both beam are interference beam.
[0473] The measurement method: the UE can be configured to measure
the beam quality (e.g., RI, CQI and/or RSRP) of some combination of
CSI-RS resources selected from different set. And in the beam
quality metric calculation, the UE can be configured to assume some
CSI-RS resources as serving beam and some other CSI-RS resources as
interference beams
[0474] The UE can be configured to report one or more of the
following information. In one example, the UE can be configured to
report one or more CSI-RS resource combinations. In each CSI-RS
resource combination, there are multiple CSI-RS resources which are
selected from different sets. In one example, the UE can be
configured to report some information to indicate in each
combination, which CSI-RS resources are selected as serving beam
and which CSI-RS resources are selected interference beams. In one
example, the UE can be configured to report the beam quality
measurement metric measured on each reported CSI-RS resource
combination. The beam quality measurement metric can be RI, CQI
and/or L1-RSRP.
[0475] In one embodiment, a UE can be configured with N=2 CSI-RS
resource sets. A first CSI-RS set C.sub.1 can have K.sub.1 CSI-RS
resources, for example C.sub.1={c.sub.1,1, c.sub.1,2, . . . ,
c.sub.1,K.sub.1}. A second CSI-RS set C.sub.2 can have K.sub.2
CSI-RS resources, for example C.sub.2={c.sub.2,1, c.sub.2,2, . . .
, c.sub.2,K.sub.2}. A first CSI-RS set can be configured as serving
set and a second CSI-RS set can be configured as interference set.
The UE can be requested to take any CSI-RS resource in a first
CSI-RS set C.sub.1 as serving beam or CSI measurement but take any
CSI-RS resource in a second CSO-RS set C.sub.2 as the interference
beam or interference measurement when the UE does beam measurement
on those CSI-RS resources. And then the UE can be requested to
select one CSI-RS resource index from a first CSI-RS set C.sub.1
and a second CSI-RS set C.sub.2 and then report the CSI-RS resource
index back to the gNB. The UE can be requested to report the RI,
CQI and/or RSRP measured on the reported CSI-RS resources.
[0476] The UE can be requested to one or more than one of the
following information sets. In one example, the UE can be
configured to report two CSI-RS resource indices
{c.sub.1,i,c.sub.2,j}, where c.sub.1,i is selected from a first
CSI-RS set C.sub.1 and c.sub.2,j is selected from a second CSI-RS
set C.sub.2. In one example, the UE can be configured to report an
RI that is calculated from the reported CSI-RS resource
{c.sub.1,i,c.sub.2,j} with using c.sub.1,i as serving beam for CSI
measurement and using c.sub.2,j as interference beam for
interference measurement.
[0477] The UE can first receive the configuration of two CSI-RS
resource sets and the measurement setting. Then the UE can pick a
first CSI-RS resource from a first set and pick a second CSI-RS
resource from a second set. The UE receives the first and second
CSI-RS resources with the same Rx-side beamforming (if the UE
supports multiple Rx beam). The UE can calculate the RI, CQI and/or
RSRP by using a first CSI-RS resource as serving beam and a second
CSI-RS as interference beam. The UE can repeat this procedure on
different CSI-RS resource selection. The UE then select one or more
pair of CSI-RS resources and report the selection back to the NW.
The UE can calculate the RI, CQI and/or RSRP by using a first
CSI-RS resource as CSI measurement and a second CSI-RS as
interference measurement. The UE can repeat this procedure on
different CSI-RS resource selection. The UE then select one or more
pair of CSI-RS resources and report the selection back to the
NW.
[0478] In one embodiment, a UE can be configured with N=2 CSI-RS
resource sets. A first CSI-RS set C.sub.1 can have K.sub.1 CSI-RS
resources, for example C.sub.1={c.sub.1,1, c.sub.1,2, . . . ,
c.sub.1,K.sub.1}. A second CSI-RS set C.sub.2 can have K.sub.2
CSI-RS resources, for example C.sub.2={c.sub.2,1, c.sub.2,2, . . .
, c.sub.2,K.sub.2}. The UE can be requested to report one or more
than one of the following information sets.
[0479] In one example, the UE can be configured to report two
CSI-RS resource indices {c.sub.1,i,c.sub.2,j}, where c.sub.1,i is
selected from a first CSI-RS set C.sub.1 and c.sub.2,j is selected
from a second CSI-RS set C.sub.2.
[0480] In one example, the UE can be configured to report a first
indicator to indicate which one of {c.sub.1,i,c.sub.2,j} is
selected as interference measurement and the other one is selected
as CSI measurement. In other words, a first indicator to indicate
which one of {c.sub.1,i,c.sub.2,j} is selected as interference beam
and the other one is selected as serving beam. In one example,
1-bit field can be used to indicate that. The value of 1-bit field
being 0 can indicate c.sub.1,i is selected as interference
measurement while the value of 1-bit field being 1 can indicate
c.sub.2,j is selected as interference measurement. In one example,
1-bit field can be used to indicate that. The value of 1-bit field
being 0 can indicate c.sub.1,i is selected as interference beam
while the value of 1-bit field being 1 can indicate c.sub.2,j is
selected as interference beam.
[0481] In one example, the UE can be configured to report an RI,
CQI and L1-RSRP that are calculated from the reported CSI-RS
resource {c.sub.1,i,c.sub.2,j} with the interference measurement
selection indicated by a first indicator. In other word, the beam
quality metric calculated based on the reported CSI-RS resource
{c.sub.1,i,c.sub.2,j} with the serving beam and interference beam
indication as indicated by a first indicator
[0482] The UE can first receive the configuration of two CSI-RS
resource sets and the measurement setting. Then the UE can pick a
first CSI-RS resource from a first set and pick a second CSI-RS
resource from a second set. The UE receives the first and second
CSI-RS resources with the same Rx-side beamforming (if the UE
supports multiple Rx beam). The UE can calculate the RI, CQI and/or
RSRP by using a first CSI-RS resource as CSI measurement and a
second CSI-RS as interference measurement. The UE can calculate the
RI, CQI and/or RSRO by using a first CSI-RS resource as
interference measurement and a second CSI-RS resource as CSI
measurement. The UE can repeat this procedure on different CSI-RS
resource selection. The UE then select one or more pair of CSI-RS
resources and also their CSI measurement/interference measurement
assignment and report the selection back to the NW.
[0483] The UE can calculate the RI, CQI and/or RSRP by assuming a
first CSI-RS resource as the serving beam and a second CSI-RS as
interference beam. The UE can calculate the RI, CQI and/or RSRO by
using a first CSI-RS resource as interference beam and a second
CSI-RS resource as the serving beam. The UE can repeat this
procedure on different CSI-RS resource selection. The UE then
select one or more pair of CSI-RS resources and also their serving
beam and interference beam assignment and report the selection back
to the NW.
[0484] In one embodiment, a UE can be configured with N=4 CSI-RS
resource sets. A first CSI-RS set C.sub.1 can have K.sub.1 CSI-RS
resources, for example C.sub.1={c.sub.1,1, c.sub.1,2, . . . ,
c.sub.1,K.sub.1}. A second CSI-RS set C.sub.2 can have K.sub.2
CSI-RS resources, for example C.sub.2={c.sub.2,1, c.sub.2,2, . . .
, c.sub.2,K.sub.2}. A third CSI-RS set C.sub.3 can have K.sub.3
CSI-RS resources, for example C.sub.3={c.sub.3,1, c.sub.3,2, . . .
, c.sub.3,K.sub.3}. A fourth CSI-RS set C.sub.4 can have K.sub.4
CSI-RS resources, for example C.sub.4={c.sub.4,1, c.sub.4,2, . . .
, c.sub.4,K.sub.4}.
[0485] A first set and a second set are configured as serving beam
set and a third set and a fourth set are configured as interference
beam set. The UE can be requested to take any CSI-RS resource in a
first CSI-RS set C.sub.1 and any CSI-RS resource in a second CSI-RS
set C.sub.2 as serving beam or CSI measurement but take any CSI-RS
resource in a third CSI-RS set C.sub.3 and any CSI-RS resource in a
fourth set C.sub.4 as the interference beam or interference
measurement when the UE does beam measurement on those CSI-RS
resources. And then the UE can be requested to select one CSI-RS
resource index from a first CSI-RS set C.sub.1, a second CSI-RS set
C.sub.2, a third CSI-RS set C.sub.3, and a fourth CSI-RS set
C.sub.4 and then report the first, second, third, and fourth CSI-RS
back to the gNB. The UE can be requested to report the RI, CQI
and/or RSRP measured on the reported CSI-RS resources. The UE can
be requested to one or more than one of the following information
sets.
[0486] In one example, the UE can be configured to report four
CSI-RS resource indices {c.sub.1,i,c.sub.2,j,c.sub.3,m,c.sub.4,n},
where c.sub.1,i is selected from a first CSI-RS set C.sub.1 and
c.sub.2,j is selected from a second CSI-RS set C.sub.2, c.sub.3,m
is selected from a third CSI-RS set C.sub.3 and c.sub.4,n is
selected from a fourth CSI-RS set c.sub.4.
[0487] In one example, the UE can be configured to report an RI
that is calculated from the reported CSI-RS resource
{c.sub.1,i,c.sub.2,j,c.sub.3,m,c.sub.4,n} with using c.sub.1,i and
c.sub.2,j as serving beam for CSI measurement and using c.sub.3,m
and c.sub.4,n as interference beam for interference
measurement.
[0488] The UE can first receive the configuration of four CSI-RS
resource sets and the measurement setting. Then the UE can pick a
first CSI-RS resource from a first set, a second CSI-RS resource
from a second set, a third CSI-RS resource from a third set and a
fourth CSI-RS resource from a fourth set. The UE receive the first,
second, third, and fourth CSI-RS resources with the same Rx-side
beamforming (if the UE supports multiple Rx beam). The UE can
calculate the RI, CQI and/or RSRP by using a first CSI-RS resource
and a second CSI-RS resource as serving beam and a third CSI-RS
resource and a fourth CSI-RS resource as interference beam. The UE
can repeat this procedure on different CSI-RS resource selection.
The UE then select one or more combinations of CSI-RS resources and
report the selection back to the NW. The UE can calculate the RI,
CQI and/or RSRP by using a first CSI-RS resource as CSI measurement
and a second CSI-RS as interference measurement. The UE can repeat
this procedure on different CSI-RS resource selection. The UE then
select one or more combinations of CSI-RS resources and report the
selection back to the NW.
[0489] Component 8: Non-Coherent Beam Reporting.
[0490] In some embodiment, a UE can be configured with N sets of
CSI-RS resources and there can be one or multiple CSI-RS resources
in each set. The UE can be measure the CSI-RS resources in those N
sets and then report back at least one CSI-RS resource index
selected from every configured set. The UE can be requested to one
or more beam combinations and in each combination, there is are N
CSI-RS resource indices and each of CSI-RS resource is selected
from different CSI-RS resource sets. The UE can be requested to
divide all his TXRUs or receive chains into multiple subsets. The
UE can measure the L1-RSRP of each CSI-RS resource on each subset
of TXRU or receive chain. Then the UE can be requested to select
CSI-RS resources from N sets based on the L1-RSRP measured from
multiple subsets of TXRU or receive chains.
[0491] In one embodiment, a UE can be configured with N=2 CSI-RS
resource sets. A first CSI-RS set C.sub.1 can have K.sub.1 CSI-RS
resources, for example C.sub.1={c.sub.1,1, c.sub.1,2, . . . ,
c.sub.1,K.sub.1}. A second CSI-RS set C.sub.2 can have K.sub.2
CSI-RS resources, for example, C.sub.2={c.sub.2,1, c.sub.2,2, . . .
, c.sub.2,K.sub.2}. The UE can be requested to report one or more
of the following information set.
[0492] In one example, the UE can be configured to report two
CSI-RS resource indices {c.sub.1,i,c.sub.2,j}, where c.sub.1,i is
selected from a first CSI-RS set C.sub.1 and c.sub.2,j is selected
from a second CSI-RS set C.sub.2.
[0493] In one example, the UE can be configured to report the
L1-RSRP of c.sub.1,i measured from a first subset of UE's TXRUs or
receive chains and the L1-RSRP of c.sub.1,i measured from a second
subset of UE's TXRUs or receive chains.
[0494] In one example, the UE can be configured to report the
L1-RSRP of c.sub.2,j measured from a first subset of UE's TXRUs or
receive chains and the L1-RSRP of c.sub.2,j measured from a second
subset of UE's TXRUs or receive chains.
[0495] In one example, the UE can be configured to report the
L1-RSRP measurement of these two CSI-RS resources may be based on
the same TRXU subset partition or receiver chain subset
partition.
[0496] In one example, the UE can be configured to report the
selection of CSI-RS resource indices {c.sub.1,i,c.sub.2,j} may meet
the condition that: the L1-RSRP of c.sub.1,i--the L1-RSRP of
c.sub.2,j measured from a first subset of TXRU or receive chain is
largest or larger than some threshold; and the L1-RSRP of
c.sub.2,j--the L1-RSRP of c.sub.1,i measured from a second subset
of TXRU or receive chain is largest or larger than some
threshold.
[0497] Although the present disclosure has been described with an
exemplary embodiment, various changes and modifications may be
suggested to one skilled in the art. It is intended that the
present disclosure encompass such changes and modifications as fall
within the scope of the appended claims.
[0498] None of the description in this application may be read as
implying that any particular element, step, or function is an
essential element that must be included in the claims scope. The
scope of patented subject matter is defined only by the claims.
Moreover, none of the claims are intended to invoke 35 U.S.C.
.sctn. 112(f) unless the exact words "means for" are followed by a
participle.
* * * * *