U.S. patent application number 17/107859 was filed with the patent office on 2021-03-18 for signaling in rrc and mac for pdsch resource mapping for periodic and semipersistent reference signal assumptions.
The applicant listed for this patent is Telefonaktiebolaget LM Ericsson (publ). Invention is credited to Sebastian Faxer, Shiwei Gao, Helka-Liina Maattanen, Siva Muruganathan.
Application Number | 20210084630 17/107859 |
Document ID | / |
Family ID | 1000005248489 |
Filed Date | 2021-03-18 |
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United States Patent
Application |
20210084630 |
Kind Code |
A1 |
Muruganathan; Siva ; et
al. |
March 18, 2021 |
SIGNALING IN RRC AND MAC FOR PDSCH RESOURCE MAPPING FOR PERIODIC
AND SEMIPERSISTENT REFERENCE SIGNAL ASSUMPTIONS
Abstract
Systems and methods for activating a Semi-Persistent (SP) Zero
Power (ZP) Channel State Information Reference Signal (CSI-RS) are
provided. In some embodiments, a method performed by a wireless
device includes for activating SP ZP CSI-RS includes receiving,
from a network node, a control message that indicates the
activation of one or more SP ZP CSI-RS resources; and activating,
based on the control message, the one or more SP ZP CSI-RS
resources. In this way, ZP CSI-RS may be used for rate matching
around other wireless devices and a SP ZP CSI-RS resource may be
activated without activating any Non-Zero Power (NZP) CSI-RS,
CSI-Interference Measurement (CSI-IM), or CSI reporting for the
wireless device.
Inventors: |
Muruganathan; Siva;
(Stittsville, CA) ; Faxer; Sebastian; (Jarfalla,
SE) ; Gao; Shiwei; (Nepean, CA) ; Maattanen;
Helka-Liina; (Helsinki, FI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Telefonaktiebolaget LM Ericsson (publ) |
Stockholm |
|
SE |
|
|
Family ID: |
1000005248489 |
Appl. No.: |
17/107859 |
Filed: |
November 30, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16774587 |
Jan 28, 2020 |
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17107859 |
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16268065 |
Feb 5, 2019 |
10582489 |
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16774587 |
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PCT/IB2019/050242 |
Jan 11, 2019 |
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16268065 |
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62616981 |
Jan 12, 2018 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04W 76/27 20180201;
H04L 5/005 20130101; H04W 72/042 20130101; H04B 7/02 20130101; H04L
5/0096 20130101; H04L 5/0035 20130101; H04L 5/0023 20130101; H04L
5/0048 20130101 |
International
Class: |
H04W 72/04 20060101
H04W072/04; H04W 76/27 20060101 H04W076/27; H04L 5/00 20060101
H04L005/00; H04B 7/02 20060101 H04B007/02 |
Claims
1. A communication system including a host computer comprising:
processing circuitry configured to provide user data; and a
communication interface configured to forward the user data to a
cellular network for transmission to a user equipment (UE), wherein
the cellular network comprises a base station, the base station
comprising base station processing circuitry configured to:
transmit, to the UE, a configuration for Semi-Persistent (SP) Zero
Power (ZP) Channel State Information Reference Signal (CSI-RS) and
a second configuration for CSI-Interference Measurement (CSI-IM);
transmit, to the UE, a first control message that indicates
activation of one or more SP ZP CSI-RS resources where the first
control message is separate from a second control message
indicating activation of SP Non-Zero Power (NZP) CSI-RS or SP
CSI-IM resources, wherein the first control message and the second
control message are Medium Access Control (MAC) Control Element
(CE) based; and transmit, to the UE, the forwarded user data.
2. The communication system of claim 1, wherein the first control
message comprises a bitmap, where the bitmap indicates if one SP ZP
CSI-RS resource set is active or not.
3. The communication system of claim 2, wherein the one SP ZP
CSI-RS resource set to which the bitmap refers is a Radio Resource
Control (RRC) configured list of SP ZP CSI-RS resources.
4. The communication system of claim 1, wherein the first control
message comprises one or more identifiers, where each identifier
identifies a preconfigured SP ZP CSI-RS resource set.
5. The communication system of claim 1, wherein in response to
activating the one or more SP ZP CSI-RS resources, Physical
Downlink Shared Channel (PDSCH) resource maps around the one or
more SP ZP CSI-RS resources.
6. The communication system of claim 1, wherein the base station
processing circuitry is further configured to: transmit, to the UE,
a deactivation control message that indicates the deactivation of
the one or more SP ZP CSI-RS resources where the deactivation
control message is a MAC CE.
7. The communication system of claim 1, wherein in response to
deactivating the one or more SP ZP CSI-RS resources, the UE stops
Physical Downlink Shared Channel (PDSCH) resource mapping around
resources for the one or more SP ZP CSI-RS.
8. A communication system including a host computer comprising:
processing circuitry configured to provide user data; and a
communication interface configured to forward the user data to a
cellular network for transmission to a user equipment (UE), wherein
the cellular network comprises a base station, the base station
comprising base station processing circuitry configured to:
transmit, to the UE, a configuration for Semi-Persistent (SP) Zero
Power (ZP) Channel State Information Reference Signal (CSI-RS) and
a second configuration for CSI-Interference Measurement (CSI-IM);
transmit, to the UE, a first control message that indicates
activation of one or more SP ZP CSI-RS resources where the first
control message is separate from a second control message
indicating activation of SP Non-Zero Power (NZP) CSI-RS or SP
CSI-IM resources, wherein the first control message and the second
control message are Medium Access Control (MAC) Control Element
(CE) based; and transmit, to the UE, the forwarded user data after
activation of the one or more SP ZP CSI-RS resources.
9. The communication system of claim 8, wherein the first control
message comprises a bitmap, if one SP ZP CSI-RS resource set is
active or not.
10. The communication system of claim 9, wherein the one SP ZP
CSI-RS resource set to which the bitmap refers is a Radio Resource
Control (RRC) configured list of SP ZP CSI-RS resources.
11. The communication system of claim 8, wherein the first control
message comprises one or more identifiers, where each identifier
identifies a preconfigured SP ZP CSI-RS resource set.
12. The communication system of claim 8, wherein in response to
activating the one or more SP ZP CSI-RS resources, Physical
Downlink Shared Channel (PDSCH) resource maps around the one or
more SP ZP CSI-RS resources.
13. The communication system of claim 8, wherein the processing
circuitry provides user data by a host application executing on the
processing circuitry.
14. The communication system of claim 13, wherein the UE is
configured with a client application to receive the forwarded user
data from the host application.
15. A host computer comprising: processing circuitry configured to
provide user data; and a communication interface configured to
forward the user data to a cellular network for transmission to a
wireless device, wherein the cellular network comprises a base
station, the base station comprising base station processing
circuitry configured to: transmit, to the wireless device, a
configuration for Semi-Persistent (SP) Zero Power (ZP) Channel
State Information Reference Signal (CSI-RS) and a second
configuration for CSI-Interference Measurement (CSI-IM); transmit,
to the wireless device, a first control message that indicates
activation of one or more SP ZP CSI-RS resources where the first
control message is separate from a second control message
indicating activation of SP Non-Zero Power (NZP) CSI-RS or SP
CSI-IM resources, wherein the first control message and the second
control message are Medium Access Control (MAC) Control Element
(CE) based; and transmit, to the wireless device, the forwarded
user data after activation of the one or more SP ZP CSI-RS
resources.
16. The host computer of claim 15, wherein the processing circuitry
provides user data by a host application.
17. The host computer of claim 16, wherein the user data is
requested by a client application executing on the wireless
device.
18. The host computer of claim 15, wherein the first control
message comprises one or more identifiers, where each identifier
identifies a preconfigured SP ZP CSI-RS resource set.
19. The host computer of claim 15, wherein in response to
activating the one or more SP ZP CSI-RS resources, the Physical
Downlink Shared Channel (PDSCH) resource maps around the one or
more SP ZP CSI-RS resources.
20. The host computer of claim 15, wherein the base station
processing circuitry is further configured to: transmit, to the UE,
a deactivation control message that indicates the deactivation of
the one or more SP ZP CSI-RS resources where the deactivation
control message is a MAC CE.
Description
RELATED APPLICATIONS
[0001] The present application is a continuation of U.S. patent
application Ser. No. 16/774,587, filed Jan. 27, 2020, which is a
continuation of U.S. patent application Ser. No. 16/268,065, filed
Feb. 5, 2019, now U.S. Pat. No. 10,582,489, which is a continuation
of International Application No. PCT/IB2019/050242, filed Jan. 11,
2019, which claims priority to Provisional Application No.
62/616,981 filed Jan. 12, 2018, the disclosures of which are
incorporated herein by reference in their entireties.
TECHNICAL FIELD
[0002] The disclosed subject matter relates generally to
telecommunications. Certain embodiments relate more particularly to
concepts such as resource mapping for reference signal
assumptions.
BACKGROUND
[0003] In Long Term Evolution (LTE), until Release 13, all
Reference Signals (RSs) that a User Equipment (UE) uses for Channel
State Information (CSI) calculation, such as Cell specific
Reference Signal (CRS) and CSI Reference Signal (CSI-RS), were
non-precoded such that UE is able to measure the raw channel and
calculate CSI feedback including preferred precoding matrix based
on that the RS. As the number of Transmit (Tx) antenna ports
increases, the amount of feedback becomes larger. In LTE
Release-10, when closed loop precoding with 8Tx was introduced, a
two-stage precoder approach was introduced where UE first selects a
wideband coarse precoder and then selects a second precoder per
subband. Another possible approach is that network beamforms the
CSI-RS and UE calculates CSI feedback using the beamformed CSI-RS.
This approach was adopted in LTE Release 13 as one option for the
Full Dimension Multi-Input Multi-Output (FD-MIMO) operation as
described in the next section. Improvements in reference signals
are needed.
SUMMARY
[0004] Systems and methods for activating a Semi-Persistent (SP)
Zero Power (ZP) Channel State Information Reference Signal (CSI-RS)
are provided. In some embodiments, a method performed by a wireless
device includes for activating SP ZP CSI-RS includes receiving,
from a network node, a control message that indicates the
activation of one or more SP ZP CSI-RS resources; and activating,
based on the control message, the one or more SP ZP CSI-RS
resources. In this way, ZP CSI-RS may be used for rate matching
around other wireless devices and a SP ZP CSI-RS resource may be
activated without activating any Non-Zero Power (NZP) CSI-RS,
CSI-Interference Measurement (CSI-IM), or CSI reporting for the
wireless device.
[0005] In some embodiments, the control message is a Medium Access
Control (MAC) Control Element (CE). In some embodiments, the
control message is separate from a control message indicating NZP,
CSI-RS, CSI-IM, or CSI.
[0006] In some embodiments, the control message comprises a bitmap,
where each bit in the bitmap indicates if one SP ZP CSI-RS resource
set is active or not. In some embodiments, the SP ZP CSI-RS
resources which the bitmap refers to is an RRC configured list of
SP ZP CSI-RS resources.
[0007] In some embodiments, the control message comprises one or
more identifiers, where each identifier identifies a preconfigured
SP ZP CSI-RS resource set. In some embodiments, the one or more
identifiers only contain a single SP CSI-RS resource identifier. In
some embodiments, the one or more identifiers refer to at least one
SP ZP CSI-RS resource set.
[0008] In some embodiments, the one or more activated SP ZP CSI-RS
resources are not used for Physical Downlink Shared Channel (PDSCH)
transmission.
[0009] In some embodiments, the method also includes, in response
to activating the one or more SP ZP CSI-RS resources, PDSCH
resource mapping around the one or more SP ZP CSI-RS resources.
[0010] In some embodiments, the method also includes, receiving,
from the network node, a deactivation control message that
indicates the deactivation of one or more SP ZP CSI-RS resources;
and deactivating, based on the deactivation control message, the
one or more SP ZP CSI-RS resources. In some embodiments, the
deactivation control message is a MAC CE.
[0011] In some embodiments, the method also includes, in response
to deactivating the one or more SP ZP CSI-RS resources, PDSCH
resource mapping around resources for the one or more SP ZP
CSI-RS.
[0012] In some embodiments, the network node is a base station. In
some embodiments, the network node operates in a Fifth Generation
(5G) New Radio (NR) cellular communications network.
[0013] In some embodiments, a method performed by a network node
for activating a SP ZP CSI-RS includes transmitting, to a wireless
device, a control message that indicates the activation of one or
more SP ZP CSI-RS resources.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawing figures incorporated in and forming
a part of this specification illustrate several aspects of the
disclosure, and together with the description serve to explain the
principles of the disclosure.
[0015] FIG. 1 is an illustration of beamformed Channel State
Information Reference Signal (CSI-RS), according to some
embodiments of the present disclosure;
[0016] FIGS. 2A and 2B illustrate a method of activating and/or
deactivating CSI-RS resources, according to some embodiments of the
present disclosure;
[0017] FIG. 3 illustrates various single beam scenarios and
multi-beam scenarios, according to some embodiments of the present
disclosure;
[0018] FIG. 4 illustrates an example of multiple Transmission
Reception Points (TRPs), according to some embodiments of the
present disclosure;
[0019] FIG. 5 illustrates one example of a cellular communications
network, according to some embodiments of the present
disclosure;
[0020] FIGS. 6-8 illustrate examples of the operation of a network
node and a wireless device for activating a Semi-Persistent (SP)
Zero Power (ZP) CSI-RS, according to some embodiments of the
present disclosure;
[0021] FIG. 9-11 illustrate several examples of multiple wireless
devices operating together, according to some embodiments of the
present disclosure;
[0022] FIGS. 12-14 illustrate schematic block diagrams of a radio
access node, according to some embodiments of the present
disclosure;
[0023] FIGS. 15 and 16 are schematic block diagrams of a wireless
device, according to some embodiments of the present
disclosure;
[0024] FIG. 17 illustrates a communication system including a
telecommunication network, according to some embodiments of the
present disclosure;
[0025] FIG. 18 illustrates a communication system, according to
some embodiments of the present disclosure; and
[0026] FIGS. 19-22 are flowcharts illustrating a method implemented
in a communication system, according to some embodiments of the
present disclosure.
DETAILED DESCRIPTION
[0027] The embodiments set forth below represent information to
enable those skilled in the art to practice the embodiments and
illustrate the best mode of practicing the embodiments. Upon
reading the following description in light of the accompanying
drawing figures, those skilled in the art will understand the
concepts of the disclosure and will recognize applications of these
concepts not particularly addressed herein. It should be understood
that these concepts and applications fall within the scope of the
disclosure.
[0028] Generally, all terms used herein are to be interpreted
according to their ordinary meaning in the relevant technical
field, unless a different meaning is clearly given and/or is
implied from the context in which it is used. All references to
a/an/the element, apparatus, component, means, step, etc. are to be
interpreted openly as referring to at least one instance of the
element, apparatus, component, means, step, etc., unless explicitly
stated otherwise. The steps of any methods disclosed herein do not
have to be performed in the exact order disclosed, unless a step is
explicitly described as following or preceding another step and/or
where it is implicit that a step must follow or precede another
step. Any feature of any of the embodiments disclosed herein may be
applied to any other embodiment, wherever appropriate. Likewise,
any advantage of any of the embodiments may apply to any other
embodiments, and vice versa. Other objectives, features, and
advantages of the enclosed embodiments will be apparent from the
following description.
[0029] In LTE, until Release 13, all reference signals (RSs) that
UE uses for Channel State Information (CSI) calculation, such as
Cell specific Reference Signal (CRS) and CSI Reference Signal
(CSI-RS), were non-precoded such that UE is able to measure the raw
channel and calculate CSI feedback including preferred precoding
matrix based on that the RS. As the number of Transmit (Tx) antenna
ports increases, the amount of feedback becomes larger. In LTE
Release-10, when closed loop precoding with 8Tx was introduced, a
two-stage precoder approach was introduced where UE first selects a
wideband coarse precoder and then selects a second precoder per
subband. Another possible approach is that network beamforms the
CSI-RS and UE calculates CSI feedback using the beamformed CSI-RS.
This approach was adopted in LTE Release 13 as one option for the
Full Dimension Multi-Input Multi-Output (FD-MIMO) operation as
described in the next section.
[0030] Release 13 FD-MIMO specification in LTE supports an enhanced
CSI reporting called Class B CSI for beamformed CSI-RS. Therein, an
LTE RRC_CONNECTED UE, i.e. a UE connected to an LTE network, can be
configured with K CSI-RS resources, where each resource may
correspond to a beam (where 1<K.ltoreq.8) where each CSI-RS
resource can consist of 1, 2, 4 or 8 CSI-RS ports. For CSI feedback
purposes, a CSI-RS Resource Indicator (CRI) was introduced in
addition to Precoding Matrix Indicator (PMI), Rank Indicator (RI)
and Channel Quality Indicator (CQI). As part of the CSI, the UE
reports the CSI-RS index (CRI) to indicate the preferred beam,
where the CRI is wideband. Other CSI components such as RI/CQI/PMI
are based on legacy codebook (i.e. Release 12) and CRI reporting
periodicity is an integer multiple of the RI reporting periodicity.
An illustration of beamformed CSI-RS is given in FIG. 1. In the
figure, the UE reports CRI=2 which corresponds to RI/CQI/PMI being
computed using `Beamformed CSI-RS 2`.
[0031] For Release 14 eFD-MIMO, non-periodic beamformed CSI-RS with
two different sub-flavors was introduced. The two sub-flavors are
aperiodic CSI-RS and semi-persistent CSI-RS. In both these
sub-flavors, the CSI-RS resources are configured for the UE as in
Release 13 with K CSI-RS resources, and a Medium Access Control
(MAC) Control Element (CE) activation of N out of the K CSI-RS
resources (N.ltoreq.K) is specified. Alternatively stated, after
the K CSI-RS resources are configured to be aperiodic CSI-RS or
semi-persistent CSI-RS, the UE waits for MAC CE activation of N out
of the K CSI-RS resources. In the case of aperiodic CSI-RS, in
addition to MAC CE activation, a Downlink Control Information (DCI)
trigger is sent to the UE so that one of the activated CSI-RS
resources is selected by the UE for CSI computation and subsequent
reporting. In the case of semi-persistent CSI-RS, once the CSI-RS
resources are activated by MAC CE, the UE can use the activated
CSI-RS resources for CSI computation and reporting.
[0032] The MAC CE activation/deactivation command is specified in
Section 5.19 of Technical Specification (TS) 36.321 where the
specification text is reproduced below.
[0033] The network may activate and deactivate the configured
CSI-RS resources of a serving cell by sending the
Activation/Deactivation of CSI-RS resources MAC control element
described below. The configured CSI-RS resources are initially
deactivated upon configuration and after a handover.
[0034] The Activation/Deactivation of CSI-RS resources MAC control
element is identified by a MAC PDU subheader with a Logical Channel
IDentifier (LCID) as specified in table 6.2.1-1. It has variable
size as the number of configured CSI process (N) and is defined in
FIG. 2A. Activation/Deactivation CSI-RS command is defined in FIG.
2B and activates or deactivates CSI-RS resources for a CSI process.
Each CSI process is associated with one or more CSI-RS resource and
one or more CSI-Interference Measurement (CSI-IM) resources.
Activation/Deactivation of CSI-RS resources MAC control element
applies to the serving cell on which the UE receives the
Activation/Deactivation of CSI-RS resources MAC control
element.
[0035] The Activation/Deactivation of CSI-RS Resources MAC Control
Elements is Defined as Follows:
[0036] R.sub.i: this field indicates the activation/deactivation
status of the CSI-RS resources associated with CSI-RS-ConfigNZPId i
for the CSI-RS process. The R.sub.i field is set to "1" to indicate
that CSI-RS resource associated with CSI-RS-ConfigNZPId i for the
CSI-RS process shall be activated. The Ri field is set to "0" to
indicate that the CSI-RS-ConfigNZPId i shall be deactivated;
[0037] The MAC activation was introduced in LTE to be able to
configure the UE with more CSI-RS resources than the maximum number
of CSI-RS resources the UE is able to support for CSI feedback. The
MAC CE would then selectively activate up to the maximum number of
CSI-RS resources supported by the UE for CSI feedback. The benefit
of MAC CE activation for CSI-RS is that the network may, without
the need to reconfigure by Radio Resource Control (RRC) layer,
activate another set of N CSI-RS resources among the K resources
configured for the UE.
[0038] For NR, all reference signals may be beamformed. In NR, the
synchronization sequences (SS), both primary (NR-PSS) and the
secondary (NR-SSS), and Physical Broadcast CHannel (PBCH), which
includes Demodulated Reference Signals (DMRSs), constitute a so
called SS Block. An RRC_CONNECTED UE trying to access a target cell
should assume that the SS Block may be transmitted in the form of
repetitive bursts of SS Block transmissions (denoted as "SS
Burst"), wherein such a burst consists of a number of SS Block
transmissions following close after each other in time.
Furthermore, a set of SS Bursts may be grouped together (denoted
"SS Burst Set"), where the SS Bursts in the SS Burst Sets are
assumed to have some relation to each other. Both SS Bursts and SS
Burst Sets have their respective given periodicity. As shown in
FIG. 3, in single beam scenarios, the network could configure
time-repetition within one SS Burst in a wide beam. In multi-beam
scenarios, at least some of these signals and physical channels
(e.g. SS Block) would be transmitted in multiple beams, which could
be done in different manners depending on network implementation,
as shown in FIG. 3.
[0039] Which of these three alternatives to implement is a network
vendor choice. That choice depends on the tradeoff between i) the
overhead caused by transmitting periodic and always on narrow beam
sweepings vs. ii) the delays and signaling needed to configure the
UE to find a narrow beam for Physical Downlink Shared Channel
(PDSCH) and Physical Downlink Control Channel (PDCCH). The
implementation shown in the upper figure within FIG. 3 prioritizes
i), while the implementation shown in the bottom figure within FIG.
3 prioritizes ii). The figure in the middle case is an intermediate
case, where a sweeping of wide beams is used. In that case, the
number of beams to cover the cell is reduced, but in some cases an
additional refinement is needed for narrow gain beamforming of
PDSCH.
[0040] In NR, the following types of CSI reporting are supported:
[0041] Periodic CSI Reporting (P CSI Reporting): CSI is reported
periodically by the UE. Parameters such as periodicity and slot
offset are configured semi-statically, by higher layer signaling
from the gNB to the UE. [0042] Aperiodic CSI Reporting (AP CSI
Reporting): This type of CSI reporting involves a single-shot
(i.e., one time) CSI report by the UE which is dynamically
triggered by the gNB, e.g. by the DCI in PDCCH. Some of the
parameters related to the configuration of the aperiodic CSI report
are semi-statically configured from the gNB to the UE but the
triggering is dynamic. [0043] Semi-Persistent CSI Reporting (SP CSI
Reporting): similar to periodic CSI reporting, semi-persistent CSI
reporting has a periodicity and slot offset which may be
semi-statically configured by the gNB to the UE. However, a dynamic
trigger from gNB to UE may be needed to allow the UE to begin
semi-persistent CSI reporting. In some cases, a dynamic trigger
from gNB to UE may be needed to command the UE to stop the
semi-persistent transmission of CSI reports. For SP CSI Reporting
on physical uplink shared channel (PUSCH), the dynamic trigger is
via DCI. For SP CSI Reporting on physical uplink control channel
(PUCCH), MAC CE is used to activate/deactivate SP CSI
reporting.
[0044] Generally, a CSI report setting contains the parameters
associated with CSI reporting including the type of CSI
reporting.
[0045] In NR, the following three types of CSI-RS transmissions are
supported: [0046] Periodic CSI-RS (P CSI-RS): CSI-RS is transmitted
periodically in certain slots. This CSI-RS transmission is
semi-statically configured using parameters such as CSI-RS
resource, periodicity, and slot offset. [0047] Aperiodic CSI-RS (AP
CSI-RS): This is a one-shot CSI-RS transmission that can happen in
any slot. Here, one-shot means that CSI-RS transmission only
happens once per trigger. The CSI-RS resources (i.e., the resource
element locations which consist of subcarrier locations and OFDM
symbol locations) for aperiodic CSI-RS are semi-statically
configured. The transmission of aperiodic CSI-RS is triggered by
dynamic signaling through PDCCH. The triggering may also include
selecting a CSI-RS resource from multiple CSI-RS resources.
Multiple aperiodic CSI-RS resources can be grouped into a CSI-RS
resource set. [0048] Semi-Persistent CSI-RS (SP CSI-RS): Similar to
periodic CSI-RS, resources for semi-persistent CSI-RS transmissions
are semi-statically configured with parameters such as periodicity
and slot offset. However, unlike periodic CSI-RS, dynamic signaling
is needed to activate and deactivate the CSI-RS transmission.
[0049] In the case of aperiodic CSI-RS and/or aperiodic CSI
reporting, the gNB RRC configures the UE with S.sub.c CSI
triggering states. Each triggering state contains the aperiodic CSI
report setting to be triggered along with the associated aperiodic
CSI-RS resource sets.
[0050] When the DCI contains a CSI request field with N bits,
aperiodic CSI-RS and/or aperiodic CSI reporting can be triggered
according to the following conditions: [0051] Condition 1: When the
number of triggering states S.sub.c.ltoreq.(2.sup.N-1), MAC CE
activation/deactivation is not used and DCI will trigger one out of
the S.sub.c. [0052] Condition 2: When the number of triggering
states S.sub.c>(2.sup.N-1), MAC CE activation is used to
activate (2.sup.N-1) triggering states. Then, DCI will trigger the
aperiodic CSI-RS and/or aperiodic CSI reporting associated with one
out of the (2.sup.N-1) triggering states. MAC CE can deactivate the
currently active triggering states and activate a new set of
(2.sup.N-1) triggering states.
[0053] In NR, the size of the CSI request field is configurable and
can take on values of N={0, 1, 2, . . . , 6}.
[0054] In the case of semi-persistent CSI-RS, the gNB first RRC
configures the UE with the semi-persistent CSI-RS resources. The
semi-persistent CSI-RS resource or semi-persistent CSI-RS resource
set is then activated via MAC CE.
[0055] Quasi co-location (QCL) is a natural way to describe the
relation between two different signals originating from the same
Transmission Reception Point (TRP) and that can be received using
the same spatial receiver parameters. As an example, the UE should
be able to assume it can use the same receive beam when receiving
the two difference signals that have spatial QCL. The spatial QCL
relations between different types of reference RS and target RS are
shown in the table below. Also, shown in the table are the
associated signaling methods. The last column of the table simply
indicates that the target and reference RSs can belong to different
component carriers (CCs) and different bandwidth parts (BWPs).
TABLE-US-00001 Reference RS and Target RS QCL Refer- should belong
param- ence Target to the same eter RS RS Signaling method CC/BWP
or not Spatial SS Block P RRC Can be on dif- (SSB) CSI-RS ferent
CCs/BWPs Spatial SSB SP SP CSI-RS Can be on dif- CSI-RS activation
signal ferent CCs/BWPs Spatial P Another P RRC Can be on dif-
CSI-RS CSI-RS ferent CCs/BWPs Spatial SSB or AP RRC or RRC + Can be
on dif- P/SP CSI- CSI-RS MAC ferent CCs/BWPs RS CE for
configuration, indication with DCI
[0056] For measurements on channel and interference, two types of
resources are defined, non-zero power (NZP) CSI-RS and CSI-IM. NZP
CSI-RS is transmitted by a network node (or gNB) for UEs to
estimate the downlink channels to the network node. While for
CSI-IM, a resource, as given by a set of REs, is indicated by the
network for the UE to perform interference measurements upon.
[0057] Zero-power (ZP) CSI-RS resources can also be configured to
the UEs. As its name implies, the gNB does not transmit anything on
the Resource Elements (REs) occupied by the ZP CSI-RS configured to
the UE. ZP CSI-RS resources are configured to the UEs for three
purposes. Firstly, ZP CSI-RS can be configured to a UE in order to
protect NZP CSI-RS transmissions from one or more neighboring
cells. Secondly, ZP CSI-RS can be used for the purposes of
indicating whether or not PDSCH is mapped to CSI-IM. Thirdly,
(aperiodic) ZP CSI-RS can be used to indicate that the UE shall
rate match, e. g. PDSCH resource mapping, its PDSCH around a
(beamformed) NZP CSI-RS intended for another UE to measure upon. It
is mainly for this third purpose the aperiodic ZP CSI-RS field in
the Downlink (DL) DCI is comprised.
[0058] In a typical use case, the network will not transmit
anything on the REs occupied by the CSI-IM, so the UE can measure
the inter-cell interference thereon. To indicate that the PDSCH is
not mapped to the REs occupied by the CSI-IM, ZP CSI-RS is
typically configured to overlap with the CSI-IM. As the CSI-IM and
ZP CSI-RS resources typically overlap, the CSI-IM is colloquially
referred to as a ZP CSI-RS based interference measurement resource
(IMR). The IMR can be aperiodic (AP IMR), semi-persistent (SP IMR)
or periodic IMR (P IMR). Note that in NR, an NZP CSI-RS can also be
configured as an IMR.
[0059] It should be noted that ZP CSI-RS used for the purposes of
indicating whether or not PDSCH is mapped to CSI-IM is configured
independently. To illustrate the reasoning for this, consider the
multiple TRP example in FIG. 4. In this example, the UE is
currently being served by TRP1 and receives PDSCH from TRP1. TRP2
is a potential future serving cell. For CSI measurements
corresponding to TRP1, the UE is configured with NZP CSI-RS1 and
CSI-IM1 to measure the desired channel from TRP1 and the
interference from TRP2, respectively. For CSI measurements
corresponding to TRP2, the UE is configured with NZP CSI-RS2 and
CSI-IM2 to measure the desired channel from TRP2 and the
interference from TRP1, respectively. When the UE measures CSI
corresponding to TRP2, the PDSCH from TRP1 that is currently
received by the UE serves as the interference. Hence, in this case,
PDSCH mapping should be allowed on REs corresponding to CSI-IM2 and
a ZP CSI-RS does not need to be independently configured to overlap
with CSI-IM2. For this reason, ZP CSI-RS and CSI-IM is configured
independently. Currently, NR supports aperiodic ZP CSI-RS (AP ZP
CSI-RS) and periodic ZP CSI-RS (P ZP CSI-RS).
[0060] In the rest of this document, a SP CSI-RS used for channel
measurement purposes (also known as channel measurement resource or
CMR) is also referred to as SP CMR.
[0061] In NR, the following was agreed to be supported for pairing
a channel measurement resource (CMR) and an IMR:
[0062] For ZP CSI-RS based IMR (i.e., CSI-IM), following
combinations of P/SP/AP CMR and IMR are supported [0063] For
semi-persistent CSI reporting,
TABLE-US-00002 [0063] P CMR SP CMR AP CMR P IMR YES NO NO SP IMR NO
YES NO AP IMR NO NO NO
[0064] For aperiodic CSI reporting,
TABLE-US-00003 [0064] P CMR S CMR AP CMR P IMR YES NO NO SP IMR NO
YES NO AP IMR NO NO YES
[0065] As indicated by the agreement above, for CSI acquisition,
semi-persistent channel measurement resource (CMR) must be used
together with semi-persistent interference measurement resource
(IMR). That is, a SP CMR cannot be used with a P IMR or an AP IMR
and can only be used with a SP IMR.
[0066] There currently exist certain challenge(s). It is still open
on how to indicate whether or not PDSCH is mapped to resources of
SP IMR.
[0067] One option is to use different MAC CEs for the following:
[0068] activation of a SP CSI-RS with QCL reference for channel
measurement [0069] activation of a SP IMR for interference
measurement [0070] activation of SP CSI reporting on PUCCH
[0071] Another issue is that only aperiodic and periodic ZP CSI-RS
is supported for NR, this implies that semi-persistent CSI-RS of
other UEs and/or cells must either be protected by periodic ZP
CSI-RS, in which the PDSCH will be rate matched around even when
the SP NZP CSI-RS is deactivated, or, using aperiodic ZP CSI-RS,
which removes the possibility to indicate rate matching around
aperiodic ZP CSI-RS. Neither of these options is attractive.
[0072] Certain aspects of the present disclosure and their
embodiments may provide solutions to the aforementioned or other
challenges. For rate matching around a UE's own SP CSI-IM, A
solution where semi-persistent ZP CSI-RS resources are used to
indicate whether or not PDSCH is mapped to semi-persistent IMR (or
SP CSI-IM). Since both SP CSI-RS and SP CSI-IM are activated via
MAC CE in NR, it would be appropriate to use the same MAC CE that
activates a SP CSI-RS and SP CSI-IM to also activate SP ZP CSI-RS.
Optionally, the same MAC CE can also be used to activate an SP
CSI.
[0073] Systems and methods for activating a Semi-Persistent (SP)
Zero Power (ZP) Channel State Information Reference Signal (CSI-RS)
are provided. In some embodiments, a method performed by a wireless
device includes for activating SP ZP CSI-RS includes receiving,
from a network node, a control message that indicates the
activation of one or more SP ZP CSI-RS resources; and activating,
based on the control message, the one or more SP ZP CSI-RS
resources. In this way, ZP CSI-RS may be used for rate matching
around other wireless devices and a SP ZP CSI-RS resource may be
activated without activating any Non-Zero Power (NZP) CSI-RS,
CSI-Interference Measurement (CSI-IM), or CSI reporting for the
wireless device.
[0074] For rate matching around other UEs' SP CSI-IM, a separate
MAC CE message other than the one for SP CSI-RS, SP CSI-IM, or SP
CSI reporting is used to activate/deactivate SP ZP CSI-RS
resources.
[0075] Alternatively, a common SP CSI-IM may be configured for all
UEs and a periodic ZP CSI-RS may be configured with the same
resource as the SP CSI-IM without any additional dynamic signaling
for rate matching around SP CSI-IM. In another option, a common SP
ZP CSI-RS may be configured which is enable when at least one SP
CSI reporting is activated and disabled when all SP CSI reporting
are deactivated. The enabling and disabling can be done through MAC
control messages.
[0076] Certain embodiments may provide one or more of the following
technical advantage(s). For rate matching around a UE's own SP
CSI-IM, an advantage of both embodiments may be that a signaling
overhead is reduced when compared to using different MAC CE
messages for activating SP CMR, SP IMR, SP ZP CSI-RS, and SP CSI
reporting on PUCCH.
[0077] For rate matching around other UEs' SP CSI-IM, the
embodiments allow either flexible rate matching with low resource
overhead or simple signaling.
[0078] Some of the embodiments contemplated herein will now be
described more fully with reference to the accompanying drawings.
Other embodiments, however, are contained within the scope of the
subject matter disclosed herein, the disclosed subject matter
should not be construed as limited to only the embodiments set
forth herein; rather, these embodiments are provided by way of
example to convey the scope of the subject matter to those skilled
in the art. Additional information may also be found in the
document(s) provided in the Appendix.
[0079] Radio Node: As used herein, a "radio node" is either a radio
access node or a wireless device.
[0080] Radio Access Node: As used herein, a "radio access node" or
"radio network node" is any node in a radio access network of a
cellular communications network that operates to wirelessly
transmit and/or receive signals. Some examples of a radio access
node include, but are not limited to, a base station (e.g., a New
Radio (NR) base station (gNB) in a Third Generation Partnership
Project (3GPP) Fifth Generation (5G) NR network or an enhanced or
evolved Node B (eNB) in a 3GPP Long Term Evolution (LTE) network),
a high-power or macro base station, a low-power base station (e.g.,
a micro base station, a pico base station, a home eNB, or the
like), and a relay node.
[0081] Core Network Node: As used herein, a "core network node" is
any type of node in a core network. Some examples of a core network
node include, e.g., a Mobility Management Entity (MME), a Packet
Data Network Gateway (P-GW), a Service Capability Exposure Function
(SCEF), or the like.
[0082] Wireless Device: As used herein, a "wireless device" is any
type of device that has access to (i.e., is served by) a cellular
communications network by wirelessly transmitting and/or receiving
signals to a radio access node(s). Some examples of a wireless
device include, but are not limited to, a User Equipment device
(UE) in a 3GPP network and a Machine Type Communication (MTC)
device.
[0083] Network Node: As used herein, a "network node" is any node
that is either part of the radio access network or the core network
of a cellular communications network/system.
[0084] Note that the description given herein focuses on a 3GPP
cellular communications system and, as such, 3GPP terminology or
terminology similar to 3GPP terminology is oftentimes used.
However, the concepts disclosed herein are not limited to a 3GPP
system.
[0085] Note that, in the description herein, reference may be made
to the term "cell;" however, particularly with respect to 5G NR
concepts, beams may be used instead of cells and, as such, it is
important to note that the concepts described herein are equally
applicable to both cells and beams.
[0086] FIG. 5 illustrates one example of a cellular communications
network 500 according to some embodiments of the present
disclosure. In the embodiments described herein, the cellular
communications network 500 is a Fifth Generation (5G) New Radio
(NR) network. In this example, the cellular communications network
500 includes base stations 502-1 and 502-2, which in LTE are
referred to as eNBs and in 5G NR are referred to as gNBs,
controlling corresponding macro cells 504-1 and 504-2. The base
stations 502-1 and 502-2 are generally referred to herein
collectively as base stations 502 and individually as base station
502. Likewise, the macro cells 504-1 and 504-2 are generally
referred to herein collectively as macro cells 504 and individually
as macro cell 504. The cellular communications network 500 also
includes a number of low power nodes 506-1 through 506-4
controlling corresponding small cells 508-1 through 508-4. The low
power nodes 506-1 through 506-4 can be small base stations (such as
pico or femto base stations) or Remote Radio Heads (RRHs), or the
like. Notably, while not illustrated, one or more of the small
cells 508-1 through 508-4 may alternatively be provided by the base
stations 502. The low power nodes 506-1 through 506-4 are generally
referred to herein collectively as low power nodes 506 and
individually as low power node 506. Likewise, the small cells 508-1
through 508-4 are generally referred to herein collectively as
small cells 508 and individually as small cell 508. The base
stations 502 (and optionally the low power nodes 506) are connected
to a core network 510.
[0087] The base stations 502 and the low power nodes 506 provide
service to wireless devices 512-1 through 512-5 in the
corresponding cells 504 and 508. The wireless devices 512-1 through
512-5 are generally referred to herein collectively as wireless
devices 512 and individually as wireless device 512. The wireless
devices 512 are also sometimes referred to herein as UEs.
[0088] Various embodiments for activation and deactivation of
SP-CSI reporting on PUSCH are described below. In this regard, FIG.
6 illustrates one example of the operation of a network node (e.g.,
a base station 502) and a wireless device 512 for activating a
PDSCH mapping rule in accordance with some embodiments of the
present disclosure. As illustrated, the network node sends, to the
wireless device 512, a control message (e.g., a MAC CE) to activate
a PDSCH mapping rule (step 600). Then, the wireless device 512,
determines whether or not the PDSCH is mapped to resources of a SP
IMR (step 602). There are various embodiments discussed below.
[0089] FIG. 7 illustrates one example of the operation of a network
node (e.g., a base station 502) and a wireless device 512 for
activating a Semi-Persistent, SP, Zero Power, ZP, Channel State
Information Reference Signal, CSI-RS in accordance with some
embodiments of the present disclosure. As illustrated, the network
node sends, to the wireless device 512, a control message (e.g., a
MAC CE) that indicates activation of one or more a SP ZP CSI-RS
resources (e.g., a bitmap) (step 700). Then, the wireless device
512 activates the one or more SP ZP CSI-RS resources (step 702).
Similarly, the network node may optionally send, to the wireless
device 512, a control message (e.g., a MAC CE) that indicates
deactivation of one or more a SP ZP CSI-RS resources (e.g., a
bitmap) (step 704). Then, the wireless device 512 deactivates the
one or more SP ZP CSI-RS resources (step 706). There are various
embodiments discussed below.
[0090] FIG. 8 illustrates one example of the operation of a network
node (e.g., a base station 502) and a wireless device 512 for
activating a Semi-Persistent, SP, Zero Power, ZP, Channel State
Information Reference Signal, CSI-RS in accordance with some
embodiments of the present disclosure. As illustrated, the network
node sends, to the wireless device 512, a configuration for SP
CSI-IM resources where all other wireless devices (512) in a cell
comprising the wireless device (512) receive the same configuration
(step 800). The wireless device 512 then determines whether to rate
match, e.g., PDSCH resource map, around the SP CSI-IM resources
(step 802).
[0091] In NR, it is agreed that for CSI acquisition,
semi-persistent channel measurement resource (CMR) must be used
together with semi-persistent CSI-IM. However, it is still not
decided how to indicate to the UE whether or not PDSCH is mapped to
the REs occupied by the semi-persistent CSI-IM. One solution is to
introduce semi-persistent ZP CSI-RS (SP ZP CSI-RS) resources which
are configured to the UE independently from semi-persistent CSI-IM.
Since both SP CSI-RS and SP CSI-IM are activated via MAC CE, it
would be appropriate to use the same MAC CE that activates a SP
CSI-RS and SP CSI-IM to also activate SP ZP CSI-RS. Optionally, the
same MAC CE can also be used to activate a SP CSI report on PUCCH.
One further benefit of introducing a SP ZP CSI-RS is that it allows
the gNB to indicate rate matching around another UEs SP NZP CSI-RS,
or, to protect a SP NZP CSI-RS of another cell.
[0092] As per 3GPP RANI agreements, a periodic reporting
configuration can be linked to only a periodic RS configuration and
semipersistent reporting can be linked to either a periodic or a
semipersistent (P/SP) RS configuration. Some embodiments describe
an RRC configuration which gives rate matching assumption for
periodic and semipersistent reference signal configuration.
[0093] In the subsequent embodiments, two different ways of
signaling for MAC CE activation of SP ZP CSI-RS for PDSCH resource
mapping are provided. In these embodiments, the same MAC CE that is
used to activate SP CMR and SP CSI-IM is used to activate SP ZP
CSI-RS for resource mapping. This MAC CE message can also indicate
whether or not PDSCH is mapped to semi-persistent CSI-IM. In some
embodiments, this MAC CE can also activate SP CSI reporting on
PUCCH.
[0094] An advantage of both embodiments may be that a signaling
overhead is reduced when compared to using different MAC CE
messages for activating SP CMR, SP CSI-IM, SP ZP CSI-RS, and SP CSI
reporting on PUCCH.
[0095] In this Embodiment 1, the linkage between SP CMR, SP CSI-IM,
and SP ZP CSI-RS can be given in either MeasLinkConfig or
ReportConfig for CSI reporting. Here, MeasLinkConfig and
ReportConfig are RRC information elements (IE) representing
measurement link configurations and reporting configurations,
respectively. To indicate to the UE that PDSCH is not mapped to the
resources of SP CSI-IM, all three entities (i.e., SP CMR, SP
CSI-IM, and SP ZP CSI-RS) are present in either MeasLinkConfig or
ReportConfig. To indicate to the UE that PDSCH is mapped to the
resources of SP CSI-IM, only SP CMR and SP CSI-IM are present in
either MeasLinkConfig or ReportConfig. Then, in the field
description of either of these IEs, depending where the linkage
ends up to be in final specification, it will be described that if
SP ZP-CSI-RS is present, UE assumes SP ZP-CSI-RS for rate matching
instead of CSI-IM. Each such linkage can be associated with an
Identifier (ID) (henceforth referred to as measID or reportID).
Then, the activation of SP CMR, SP CSI-IM and/or SP ZP CSI-RS can
be done by pointing only to either measID or reportID in a MAC
CE.
[0096] In another variant of this embodiment, in addition to SP
CMR, SP CSI-IM, and SP ZP CSI-RS, a joint activation of a SP CSI
reporting on PUCCH is performed using the same MAC CE. In this
variant, the SP CSI-RS used for CMR can be defined in an RRC
configured parameter SP-CSI-RS Config. SP-CSI-RS Config can include
the corresponding SP CSI-IM and a report ID corresponding to a
ReportConfig. The ReportConfig contains the details of the SP CSI
reporting on PUCCH to be activated. Depending on whether or not
PDSCH is mapped to the corresponding SP CSI-IM, SP-CSI-RS config
can also include SP ZP CSI-RS. To indicate to the UE that PDSCH is
not mapped to the resources of SP CSI-IM, the SP ZP CSI-RS
corresponding to the SP CSI-IM is included in the SP-CSI-RS config.
To indicate to the UE that PDSCH is mapped to the resources of SP
CSI-IM, the SP ZP CSI-RS corresponding to the SP CSI-IM is not
included in the SP-CSI-RS config.
[0097] In yet another variant embodiment, the SP CMR, SP CSI-IM and
the SP CSI reporting on PUCCH are defined in a MeasLinkConfig with
a measID. Depending on whether or not PDSCH is mapped to the
corresponding SP CSI-IM, the MeasLinkConfig can also include SP ZP
CSI-RS. To indicate to the UE that PDSCH is not mapped to the
resources of SP CSI-IM, the SP ZP CSI-RS corresponding to the SP
CSI-IM is included in MeasLinkConfig. To indicate to the UE that
PDSCH is mapped to the resources of SP CSI-IM, the SP ZP CSI-RS
corresponding to the SP CSI-IM is not included in MeasLinkConfig.
In this variant of the embodiment, a MAC CE indicates the measID to
jointly activate a given combination of SP CMR, SP CSI-IM, SP CSI
reporting, and/or SP ZP CSI-RS.
[0098] In another variant of the embodiment, the SP CMR, SP CSI-IM,
and the SP CSI reporting on PUCCH are defined in a ReportConfig
with reportID. Depending on whether or not PDSCH is mapped to the
corresponding SP CSI-IM, the ReportConfig can also include SP ZP
CSI-RS. To indicate to the UE that PDSCH is not mapped to the
resources of SP CSI-IM, the SP ZP CSI-RS corresponding to the SP
CSI-IM is included in ReportConfig. To indicate to the UE that
PDSCH is mapped to the resources of SP CSI-IM, the SP ZP CSI-RS
corresponding to the SP CSI-IM is not included in ReportConfig. In
this variant of the embodiment, a MAC CE then indicates the
reportID to jointly activate a given combination of SP CMR, SP
CSI-IM, SP ZP CSI-RS, and SP CSI reporting.
[0099] In Embodiment 2, a bit R1 in the MAC CE activating the SP
CSI-IM indicates whether or not PDSCH is mapped to the SP
CSI-IM.
[0100] In one detailed variant of this embodiment, the linkage
between SP CMR, SP CSI-IM, and SP ZP CSI-RS can be given in either
MeasLinkConfig or ReportConfig. In this embodiment, all three
entities (i.e., SP CMR, SP CSI-IM, and SP ZP CSI-RS) are present in
either MeasLinkConfig or ReportConfig. If the bit R1 is set to "1",
then PDSCH is not mapped to the resources of SP CSI-IM and PDSCH is
mapped around the resources in SP ZP CSI-RS. If R1 is set to "0",
PDSCH is mapped to the resources of SP CSI-IM and the SP ZP CSI-RS
defined in either MeasLinkConfig or ReportConfig is ignored. In
this embodiment, the activation of SP CMR, SP CSI-IM and/or SP ZP
CSI-RS can be done by pointing only to either measID or reportID in
a MAC CE which also contains the dedicated bit R1.
[0101] In another detailed variant of this embodiment, in addition
to SP CMR, SP CSI-IM, and SP ZP CSI-RS, a joint activation of a SP
CSI reporting on PUCCH is performed using the same MAC CE. In this
variant, the SP CSI-RS used for CMR can be defined in an RRC
configured parameter SP-CSI-RS Config. SP-CSI-RS config can include
the corresponding SP CSI-IM, SP ZP CSI-RS and a report ID
corresponding to a ReportConfig. The report config contains the
details of the SP CSI reporting on PUCCH to be activated. If the
bit R1 is set to "1", then PDSCH is not mapped to the resources of
SP CSI-IM and PDSCH is mapped around the resources in SP ZP CSI-RS.
If R1 is set to "0", PDSCH is mapped to the resources of SP CSI-IM
and the SP ZP CSI-RS defined in SP-CSI-RS config is ignored.
[0102] In yet another detailed variant of this embodiment, the SP
CMR, SP CSI-IM, SP ZP CSI-RS and the SP CSI reporting on PUCCH are
defined in a MeasLinkConfig with a measID. If the bit R1 is set to
"1", then PDSCH is not mapped to the resources of SP CSI-IM and
PDSCH is mapped around the resources in SP ZP CSI-RS. If R1 is set
to "0", PDSCH is mapped to the resources of SP CSI-IM and the SP ZP
CSI-RS defined in MeasLinkConfig is ignored. In this variant of the
embodiment, a MAC CE indicates the measID along with dedicated bit
R1 to jointly activate a given combination of SP CMR, SP CSI-IM, SP
CSI reporting, and/or SP ZP CSI-RS.
[0103] In another detailed variant of the embodiment, the SP CMR,
SP CSI-IM, and the SP CSI reporting on PUCCH are defined in a
ReportConfig with reportID. If the bit R1 is set to "1", then PDSCH
is not mapped to the resources of SP CSI-IM and PDSCH is mapped
around the resources in SP ZP CSI-RS. If R1 is set to "0", PDSCH is
mapped to the resources of SP CSI-IM and the SP ZP CSI-RS defined
in ReportConfig is ignored. In this variant of the embodiment, a
MAC CE indicates the reportID along with dedicated bit R1 to
jointly activate a given combination of SP CMR, SP CSI-IM, SP ZP
CSI-RS, and SP CSI reporting.
[0104] In yet another variant of this embodiment, no configuration
of SP ZP CSI-RS resource in MeasLinkConfig or ReportConfig is
required as the rate matching of PDSCH around the SP CSI-IM can be
controlled directly by the bit R1. If R1 is set to 1 then PDSCH is
not mapped to the resource elements of the SP CSI-IM while the
opposite occurs if R1 is set to 0.
[0105] With regard to embodiment 3, since ZP CSI-RS may be used for
rate matching, e.g., PDSCH resource mapping, around other UEs NZP
CSI-RS it may be beneficial to activate a SP ZP CSI-RS resource
without activating any NZP CSI-RS, CSI-IM, or CSI reporting for the
UE. Therefore, in some embodiments, a separate MAC CE message is
used to activate/deactivate SP ZP CSI-RS resources. In some
embodiments, the activation/deactivation message comprises a bitmap
of N bits, where each bit in the bitmap indicates if one SP ZP
CSI-RS resource is activate or not. The SP ZP CSI-RS resources
which the bitmap refers to may be an RRC configured list of SP ZP
CSI-RS resources.
[0106] In other embodiments, the activation/deactivation message
may comprise a list of SP ZP CSI-RS resource identifier to be
activated/deactivated. The list may in some embodiments be of size
one and thus only contains a single SP CSI-RS resource identifier.
Furthermore, each entry in the list may be accompanied by another
bit which indicates if the SP CSI-RS resource is activated or
deactivated.
[0107] In this case the UE side assumption is that when ZP-CSI-RS
is activated, UE rate matches, e.g., PDSCH resource map, around
this ZP-CSI RS and not around possible active CSI-IM resource. When
ZP-CSI RS is deactivated, UE rate matches around an active CSI-IM,
and other default assumption.
[0108] In some embodiments, a corresponding RRC configuration for
periodic RS is that if in RS resource configuration for periodic
RS, a ZP-CSI-RS configuration is present, UE rate matches around
this ZP-CSI RS and not around the configured CSI-IM resource.
[0109] Since the most typical use case of SP CSI-IM is for
inter-cell interference measurement and the inter-cell interference
sources for UEs in the same cell is the same, all UEs can share the
same SP CSI-IM. Thus, in Embodiment 4, a SP CSI-IM resource is
shared by all UEs in a cell, i.e., the same SP CSI-IM resource
(i.e. periodicity, slot offset, time-frequency REs in a slot) is
configured for all UEs in a cell. A UE may not start interference
measurement on the SP CSI-IM until after an associated SP CSI
report is activated. There are a few options that can be used for
rate matching indication: [0110] Option 1: The UE always rate
matches around the SP CSI-IM for decoding a PDSCH in a slot with
the same slot offset as the SP CSI-IM regardless of the activation
of the SP CSI report. This can be achieved by configuring a common
periodic ZP CSI-RS having the same resource configuration as the SP
CSI-IM for all the UEs. An example is shown in FIG. 9, where three
UEs are shown and each of the UEs is activated at a different time
for SP CSI reporting. Each UE is configured with a periodic ZP
CSI-RS having the same periodicity, slot offset, and time-frequency
resource. In this case, there is no additional dynamic signaling
needed for rate matching around SP CSI-IM. The cost is some
additional overhead if there is no SP CSI-IM activated during some
period. Since the SP CSI-IM is common to all UEs, the additional
overhead should be small. [0111] Option 2: A UE performs rate
matching around SP CSI-IM for PDSCH only when a SP CSI report is
activated by at least one UE. This can be achieved by configuring a
common SP ZP CSI-RS having the same resource as the SP CSI-IM for
all UEs. The SP ZP CSI-RS is enabled when at least one SP CSI
report is activated and disabled when there is no SP CSI report
activated. That is under the assumption, activating CSI activates
the RSs. An example is shown in FIG. 10, where a common SP ZP
CSI-RS is configured for all UEs. It is enabled when UE #1's SP CSI
report is activated and disabled after UE #3's SP CSI report is
deactivated. This needs to be signaled to each UE individually. In
this example, when UE #1's SP CSI reporting is activated, gNB need
also to send a command to all three UEs to enable the SP ZP CSI-RS.
Similarly, when UE #3's SP CSI reporting is deactivated; gNB needs
to send another command to all three UEs to disable the SP ZP
CSI-RS. When the number of UEs is large, the signaling overhead can
be large as well. [0112] Option 3: a UE is configured with multiple
SP ZP CSI-RS resources; each is mapped to a SP CSI-IM of one UE in
the same cell. These SP ZP CSI-RS are enabled when the
corresponding SP CSI reporting is activated and is disabled when
the SP CSI reporting is deactivated. An example is shown in FIG.
11. In this case, when a SP CSI reporting is activated, the gNB
needs to send a command to all UEs in the cell enable the
corresponding SP ZP CSI-RS associated with the SP CSI-IM. Comparing
to option 2, there are more signaling involved in the option. A
potential advantage of this option is less resource overhead for
rate matching when different SP CSI-IM resources are configured for
different UEs since the SP ZP CSI-RS resource can be mapped exactly
to each SP CSI-IM resource.
[0113] FIG. 12 is a schematic block diagram of a radio access node
1200 according to some embodiments of the present disclosure. The
radio access node 1200 may be, for example, a base station 502 or
506. As illustrated, the radio access node 1200 includes a control
system 1202 that includes one or more processors 1204 (e.g.,
Central Processing Units (CPUs), Application Specific Integrated
Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), and/or
the like), memory 1206, and a network interface 1208. In addition,
the radio access node 1200 includes one or more radio units 1210
that each includes one or more transmitters 1212 and one or more
receivers 1214 coupled to one or more antennas 1216. In some
embodiments, the radio unit(s) 1210 is external to the control
system 1202 and connected to the control system 1202 via, e.g., a
wired connection (e.g., an optical cable). However, in some other
embodiments, the radio unit(s) 1210 and potentially the antenna(s)
1216 are integrated together with the control system 1202. The one
or more processors 1204 operate to provide one or more functions of
a radio access node 1200 as described herein. In some embodiments,
the function(s) are implemented in software that is stored, e.g.,
in the memory 1206 and executed by the one or more processors
1204.
[0114] FIG. 13 is a schematic block diagram that illustrates a
virtualized embodiment of the radio access node 1200 according to
some embodiments of the present disclosure. This discussion is
equally applicable to other types of network nodes. Further, other
types of network nodes may have similar virtualized
architectures.
[0115] As used herein, a "virtualized" radio access node is an
implementation of the radio access node 1200 in which at least a
portion of the functionality of the radio access node 1200 is
implemented as a virtual component(s) (e.g., via a virtual
machine(s) executing on a physical processing node(s) in a
network(s)). As illustrated, in this example, the radio access node
1200 includes the control system 1202 that includes the one or more
processors 1204 (e.g., CPUs, ASICs, FPGAs, and/or the like), the
memory 1206, and the network interface 1208 and the one or more
radio units 1210 that each includes the one or more transmitters
1212 and the one or more receivers 1214 coupled to the one or more
antennas 1216, as described above. The control system 1202 is
connected to the radio unit(s) 1210 via, for example, an optical
cable or the like. The control system 1202 is connected to one or
more processing nodes 1300 coupled to or included as part of a
network(s) 1302 via the network interface 1208. Each processing
node 1300 includes one or more processors 1304 (e.g., CPUs, ASICs,
FPGAs, and/or the like), memory 1306, and a network interface
1308.
[0116] In this example, functions 1310 of the radio access node
1200 described herein are implemented at the one or more processing
nodes 1300 or distributed across the control system 1202 and the
one or more processing nodes 1300 in any desired manner. In some
particular embodiments, some or all of the functions 1310 of the
radio access node 1200 described herein are implemented as virtual
components executed by one or more virtual machines implemented in
a virtual environment(s) hosted by the processing node(s) 1300. As
will be appreciated by one of ordinary skill in the art, additional
signaling or communication between the processing node(s) 1300 and
the control system 1202 is used in order to carry out at least some
of the desired functions 1310. Notably, in some embodiments, the
control system 1202 may not be included, in which case the radio
unit(s) 1210 communicates directly with the processing node(s) 1300
via an appropriate network interface(s).
[0117] In some embodiments, a computer program including
instructions which, when executed by at least one processor, causes
the at least one processor to carry out the functionality of radio
access node 1200 or a node (e.g., a processing node 1300)
implementing one or more of the functions 1310 of the radio access
node 1200 in a virtual environment according to any of the
embodiments described herein is provided. In some embodiments, a
carrier comprising the aforementioned computer program product is
provided. The carrier is one of an electronic signal, an optical
signal, a radio signal, or a computer readable storage medium
(e.g., a non-transitory computer readable medium such as
memory).
[0118] FIG. 14 is a schematic block diagram of the radio access
node 1200 according to some other embodiments of the present
disclosure. The radio access node 1200 includes one or more modules
1400, each of which is implemented in software. The module(s) 1400
provide the functionality of the radio access node 1200 described
herein. This discussion is equally applicable to the processing
node 1300 of FIG. 13 where the modules 1400 may be implemented at
one of the processing nodes 1300 or distributed across multiple
processing nodes 1300 and/or distributed across the processing
node(s) 1300 and the control system 1202.
[0119] FIG. 15 is a schematic block diagram of a UE 1500 according
to some embodiments of the present disclosure. As illustrated, the
UE 1500 includes one or more processors 1502 (e.g., CPUs, ASICs,
FPGAs, and/or the like), memory 1504, and one or more transceivers
1506 each including one or more transmitters 1508 and one or more
receivers 1510 coupled to one or more antennas 1512. In some
embodiments, the functionality of the UE 1500 described above may
be fully or partially implemented in software that is, e.g., stored
in the memory 1504 and executed by the processor(s) 1502.
[0120] In some embodiments, a computer program including
instructions which, when executed by at least one processor, causes
the at least one processor to carry out the functionality of the UE
1500 according to any of the embodiments described herein is
provided. In some embodiments, a carrier comprising the
aforementioned computer program product is provided. The carrier is
one of an electronic signal, an optical signal, a radio signal, or
a computer readable storage medium (e.g., a non-transitory computer
readable medium such as memory).
[0121] FIG. 16 is a schematic block diagram of the UE 1500
according to some other embodiments of the present disclosure. The
UE 1500 includes one or more modules 1600, each of which is
implemented in software. The module(s) 1600 provide the
functionality of the UE 1500 described herein.
[0122] With reference to FIG. 17, in accordance with an embodiment,
a communication system includes a telecommunication network 1700,
such as a 3GPP-type cellular network, which comprises an access
network 1702, such as a RAN, and a core network 1704. The access
network 1702 comprises a plurality of base stations 1706A, 1706B,
1706C, such as NBs, eNBs, gNBs, or other types of wireless Access
Points (APs), each defining a corresponding coverage area 1708A,
1708B, 1708C. Each base station 1706A, 1706B, 1706C is connectable
to the core network 1704 over a wired or wireless connection 1710.
A first UE 1712 located in coverage area 1708C is configured to
wirelessly connect to, or be paged by, the corresponding base
station 1706C. A second UE 1714 in coverage area 1708A is
wirelessly connectable to the corresponding base station 1706A.
While a plurality of UEs 1712, 1714 are illustrated in this
example, the disclosed embodiments are equally applicable to a
situation where a sole UE is in the coverage area or where a sole
UE is connecting to the corresponding base station 1706.
[0123] The telecommunication network 1700 is itself connected to a
host computer 1716, which may be embodied in the hardware and/or
software of a standalone server, a cloud-implemented server, a
distributed server, or as processing resources in a server farm.
The host computer 1716 may be under the ownership or control of a
service provider, or may be operated by the service provider or on
behalf of the service provider. Connections 1718 and 1720 between
the telecommunication network 1700 and the host computer 1716 may
extend directly from the core network 1704 to the host computer
1716 or may go via an optional intermediate network 1722. The
intermediate network 1722 may be one of, or a combination of more
than one of, a public, private, or hosted network; the intermediate
network 1722, if any, may be a backbone network or the Internet; in
particular, the intermediate network 1722 may comprise two or more
sub-networks (not shown).
[0124] The communication system of FIG. 17 as a whole enables
connectivity between the connected UEs 1712, 1714 and the host
computer 1716. The connectivity may be described as an Over-the-Top
(OTT) connection 1724. The host computer 1716 and the connected UEs
1712, 1714 are configured to communicate data and/or signaling via
the OTT connection 1724, using the access network 1702, the core
network 1704, any intermediate network 1722, and possible further
infrastructure (not shown) as intermediaries. The OTT connection
1724 may be transparent in the sense that the participating
communication devices through which the OTT connection 1724 passes
are unaware of routing of uplink and downlink communications. For
example, the base station 1706 may not or need not be informed
about the past routing of an incoming downlink communication with
data originating from the host computer 1716 to be forwarded (e.g.,
handed over) to a connected UE 1712. Similarly, the base station
1706 need not be aware of the future routing of an outgoing uplink
communication originating from the UE 1712 towards the host
computer 1716.
[0125] Example implementations, in accordance with an embodiment,
of the UE, base station, and host computer discussed in the
preceding paragraphs will now be described with reference to FIG.
18. In a communication system 1800, a host computer 1802 comprises
hardware 1804 including a communication interface 1806 configured
to set up and maintain a wired or wireless connection with an
interface of a different communication device of the communication
system 1800. The host computer 1802 further comprises processing
circuitry 1808, which may have storage and/or processing
capabilities. In particular, the processing circuitry 1808 may
comprise one or more programmable processors, ASICs, FPGAs, or
combinations of these (not shown) adapted to execute instructions.
The host computer 1802 further comprises software 1810, which is
stored in or accessible by the host computer 1802 and executable by
the processing circuitry 1808. The software 1810 includes a host
application 1812. The host application 1812 may be operable to
provide a service to a remote user, such as a UE 1814 connecting
via an OTT connection 1816 terminating at the UE 1814 and the host
computer 1802. In providing the service to the remote user, the
host application 1812 may provide user data which is transmitted
using the OTT connection 1816.
[0126] The communication system 1800 further includes a base
station 1818 provided in a telecommunication system and comprising
hardware 1820 enabling it to communicate with the host computer
1802 and with the UE 1814. The hardware 1820 may include a
communication interface 1822 for setting up and maintaining a wired
or wireless connection with an interface of a different
communication device of the communication system 1800, as well as a
radio interface 1824 for setting up and maintaining at least a
wireless connection 1826 with the UE 1814 located in a coverage
area (not shown in FIG. 18) served by the base station 1818. The
communication interface 1822 may be configured to facilitate a
connection 1828 to the host computer 1802. The connection 1828 may
be direct or it may pass through a core network (not shown in FIG.
18) of the telecommunication system and/or through one or more
intermediate networks outside the telecommunication system. In the
embodiment shown, the hardware 1820 of the base station 1818
further includes processing circuitry 1830, which may comprise one
or more programmable processors, ASICs, FPGAs, or combinations of
these (not shown) adapted to execute instructions. The base station
1818 further has software 1832 stored internally or accessible via
an external connection.
[0127] The communication system 1800 further includes the UE 1814
already referred to. The UE's 1814 hardware 1834 may include a
radio interface 1836 configured to set up and maintain a wireless
connection 1826 with a base station serving a coverage area in
which the UE 1814 is currently located. The hardware 1834 of the UE
1814 further includes processing circuitry 1838, which may comprise
one or more programmable processors, ASICs, FPGAs, or combinations
of these (not shown) adapted to execute instructions. The UE 1814
further comprises software 1840, which is stored in or accessible
by the UE 1814 and executable by the processing circuitry 1838. The
software 1840 includes a client application 1842. The client
application 1842 may be operable to provide a service to a human or
non-human user via the UE 1814, with the support of the host
computer 1802. In the host computer 1802, the executing host
application 1812 may communicate with the executing client
application 1842 via the OTT connection 1816 terminating at the UE
1814 and the host computer 1802. In providing the service to the
user, the client application 1842 may receive request data from the
host application 1812 and provide user data in response to the
request data. The OTT connection 1816 may transfer both the request
data and the user data. The client application 1842 may interact
with the user to generate the user data that it provides.
[0128] It is noted that the host computer 1802, the base station
1818, and the UE 1814 illustrated in FIG. 18 may be similar or
identical to the host computer 1716, one of the base stations
1706A, 1706B, 1706C, and one of the UEs 1712, 1714 of FIG. 17,
respectively. This is to say, the inner workings of these entities
may be as shown in FIG. 18 and independently, the surrounding
network topology may be that of FIG. 17.
[0129] In FIG. 18, the OTT connection 1816 has been drawn
abstractly to illustrate the communication between the host
computer 1802 and the UE 1814 via the base station 1818 without
explicit reference to any intermediary devices and the precise
routing of messages via these devices. The network infrastructure
may determine the routing, which may be configured to hide from the
UE 1814 or from the service provider operating the host computer
1802, or both. While the OTT connection 1816 is active, the network
infrastructure may further take decisions by which it dynamically
changes the routing (e.g., on the basis of load balancing
consideration or reconfiguration of the network).
[0130] The wireless connection 1826 between the UE 1814 and the
base station 1818 is in accordance with the teachings of the
embodiments described throughout this disclosure. One or more of
the various embodiments improve the performance of OTT services
provided to the UE 1814 using the OTT connection 1816, in which the
wireless connection 1826 forms the last segment. More precisely,
the teachings of these embodiments may improve the downlink
resource utilization efficiency and thereby provide benefits such
as improved UE throughputs and network capacity.
[0131] A measurement procedure may be provided for the purpose of
monitoring data rate, latency, and other factors on which the one
or more embodiments improve. There may further be an optional
network functionality for reconfiguring the OTT connection 1816
between the host computer 1802 and the UE 1814, in response to
variations in the measurement results. The measurement procedure
and/or the network functionality for reconfiguring the OTT
connection 1816 may be implemented in the software 1810 and the
hardware 1804 of the host computer 1802 or in the software 1840 and
the hardware 1834 of the UE 1814, or both. In some embodiments,
sensors (not shown) may be deployed in or in association with
communication devices through which the OTT connection 1816 passes;
the sensors may participate in the measurement procedure by
supplying values of the monitored quantities exemplified above, or
supplying values of other physical quantities from which the
software 1810, 1840 may compute or estimate the monitored
quantities. The reconfiguring of the OTT connection 1816 may
include message format, retransmission settings, preferred routing,
etc.; the reconfiguring need not affect the base station 1814, and
it may be unknown or imperceptible to the base station 1814. Such
procedures and functionalities may be known and practiced in the
art. In certain embodiments, measurements may involve proprietary
UE signaling facilitating the host computer 1802's measurements of
throughput, propagation times, latency, and the like. The
measurements may be implemented in that the software 1810 and 1840
causes messages to be transmitted, in particular empty or `dummy`
messages, using the OTT connection 1816 while it monitors
propagation times, errors, etc.
[0132] FIG. 19 is a flowchart illustrating a method implemented in
a communication system, in accordance with one embodiment. The
communication system includes a host computer, a base station, and
a UE which may be those described with reference to FIGS. 17 and
18. For simplicity of the present disclosure, only drawing
references to FIG. 19 will be included in this section. In step
1900, the host computer provides user data. In sub-step 1902 (which
may be optional) of step 1900, the host computer provides the user
data by executing a host application. In step 1904, the host
computer initiates a transmission carrying the user data to the UE.
In step 1906 (which may be optional), the base station transmits to
the UE the user data which was carried in the transmission that the
host computer initiated, in accordance with the teachings of the
embodiments described throughout this disclosure. In step 1908
(which may also be optional), the UE executes a client application
associated with the host application executed by the host
computer.
[0133] FIG. 20 is a flowchart illustrating a method implemented in
a communication system, in accordance with one embodiment. The
communication system includes a host computer, a base station, and
a UE which may be those described with reference to FIGS. 17 and
18. For simplicity of the present disclosure, only drawing
references to FIG. 20 will be included in this section. In step
2000 of the method, the host computer provides user data. In an
optional sub-step (not shown) the host computer provides the user
data by executing a host application. In step 2002, the host
computer initiates a transmission carrying the user data to the UE.
The transmission may pass via the base station, in accordance with
the teachings of the embodiments described throughout this
disclosure. In step 2004 (which may be optional), the UE receives
the user data carried in the transmission.
[0134] FIG. 21 is a flowchart illustrating a method implemented in
a communication system, in accordance with one embodiment. The
communication system includes a host computer, a base station, and
a UE which may be those described with reference to FIGS. 17 and
18. For simplicity of the present disclosure, only drawing
references to FIG. 21 will be included in this section. In step
2100 (which may be optional), the UE receives input data provided
by the host computer. Additionally or alternatively, in step 2102,
the UE provides user data. In sub-step 2104 (which may be optional)
of step 2100, the UE provides the user data by executing a client
application. In sub-step 2106 (which may be optional) of step 2102,
the UE executes a client application which provides the user data
in reaction to the received input data provided by the host
computer. In providing the user data, the executed client
application may further consider user input received from the user.
Regardless of the specific manner in which the user data was
provided, the UE initiates, in sub-step 2108 (which may be
optional), transmission of the user data to the host computer. In
step 2110 of the method, the host computer receives the user data
transmitted from the UE, in accordance with the teachings of the
embodiments described throughout this disclosure.
[0135] FIG. 22 is a flowchart illustrating a method implemented in
a communication system, in accordance with one embodiment. The
communication system includes a host computer, a base station, and
a UE which may be those described with reference to FIGS. 17 and
18. For simplicity of the present disclosure, only drawing
references to FIG. 22 will be included in this section. In step
2200 (which may be optional), in accordance with the teachings of
the embodiments described throughout this disclosure, the base
station receives user data from the UE. In step 2202 (which may be
optional), the base station initiates transmission of the received
user data to the host computer. In step 2204 (which may be
optional), the host computer receives the user data carried in the
transmission initiated by the base station.
[0136] Any appropriate steps, methods, features, functions, or
benefits disclosed herein may be performed through one or more
functional units or modules of one or more virtual apparatuses.
Each virtual apparatus may comprise a number of these functional
units. These functional units may be implemented via processing
circuitry, which may include one or more microprocessor or
microcontrollers, as well as other digital hardware, which may
include DSPs, special-purpose digital logic, and the like. The
processing circuitry may be configured to execute program code
stored in memory, which may include one or several types of memory
such as ROM, RAM, cache memory, flash memory devices, optical
storage devices, etc. Program code stored in memory includes
program instructions for executing one or more telecommunications
and/or data communications protocols as well as instructions for
carrying out one or more of the techniques described herein. In
some implementations, the processing circuitry may be used to cause
the respective functional unit to perform corresponding functions
according one or more embodiments of the present disclosure.
[0137] While processes in the figures may show a particular order
of operations performed by certain embodiments of the invention, it
should be understood that such order is exemplary (e.g.,
alternative embodiments may perform the operations in a different
order, combine certain operations, overlap certain operations,
etc.).
EMBODIMENTS
Group A Embodiments
[0138] 1. A method performed by a wireless device (512) for
activating a semi-persistent Physical Downlink Shared Channel,
PDSCH, mapping rule, the method comprising at least one of: [0139]
receiving (600), from a network node (502), a control message to
activate a PDSCH mapping rule; [0140] determining (602), based on
the control message, whether or not the PDSCH is mapped to
resources of a Semi-Persistent, SP, Interference Measurement
Resource, IMR. 2. The method of embodiment 1 where the control
message is a Medium Access Control, MAC, Control Element, CE. 3.
The method of embodiment 1 or 2 further comprising: [0141] using
the control message to also activate at least one of a
preconfigured SP Channel Measurement Resource, SP CMR, a
preconfigured SP IMR, and a preconfigured SP Channel State
Information, SP CSI, report. 4. The method of any of embodiments 1
to 3 wherein the activation of a PDSCH mapping rule comprises
activation of a preconfigured SP Zero Power, ZP, CSI Reference
Signal, CSI-RS, resource. 5. The method of embodiment 2, wherein
the control message contains a first identifier that identifies at
least one of the preconfigured SP CMR, the preconfigured SP IMR,
and the preconfigured SP Zero Power, ZP, Channel State Information
Reference Signal, CSI-RS, and, optionally, wherein the control
message contains a second identifier that identifies the
preconfigured SP CSI report. 6. The method of embodiment 5 wherein
when the first identifier identifies at least both the
preconfigured SP IMR and the preconfigured SP ZP CSI-RS, the
wireless device (512) is instructed not to map PDSCH to the
resources occupied by the preconfigured SP IMR. 7. The method of
embodiment 5 wherein when the first identifier does not identify
the preconfigured SP ZP CSI-RS but identifies at least the
preconfigured SP IMR, the wireless device (512) is instructed to
map PDSCH to the resources occupied by the preconfigured SP IMR. 8.
The method of any of embodiments 5 through 7 wherein the first
identifier is either a MeasLinkConfig or a ReportConfig parameter.
9. The method of any of embodiments 1 through 4 wherein activating
the PDSCH mapping rule comprises receiving a control message
containing an identifier bit which indicates to the wireless device
(512) whether to map PDSCH to the resources occupied by the
preconfigured SP IMR. 10. The method of embodiment 9 wherein the
control message contains a first identifier that identifies at
least one of the preconfigured SP CMR, the preconfigured SP IMR,
and the preconfigured SP ZP CSI-RS, and wherein, optionally, the
control message contains a second identifier that identifies the
preconfigured SP CSI report; and, optionally, [0142] if the
identifier bit is set to "1" or TRUE, then the PDSCH is not mapped
to the resources of the SP CSI Interference Measurement (CSI-IM);
and [0143] if the identifier bit is set to "0" or FALSE, then the
PDSCH is mapped to the resources of the SP CSI-IM. 11. The method
of embodiment 9 or 10 wherein the identifier bit is an R1 bit in
the control message. 12. The method of any of embodiments 1 through
11 wherein the SP IMR is a SP CSI-IM. 13. The method of any of
embodiments 2 through 12 wherein the SP CMR is a SP CSI-RS. 14. A
method performed by a wireless device (512) for activating a
Semi-Persistent, SP, Zero Power, ZP, Channel State Information
Reference Signal, CSI-RS, the method comprising at least one of:
[0144] receiving (700), from a network node (502), a control
message that indicates the activation of one or more SP ZP CSI-RS
resources; and [0145] activating (702), based on the control
message, the one or more SP ZP CSI-RS resources. 15. The method of
embodiment 14 where the control message is a Medium Access Control,
MAC, Control Element, CE. 16. The method of embodiment 14 or 15
wherein the control message comprises a bitmap, wherein each bit in
the bitmap indicates if one SP ZP CSI-RS resource is active or not.
17. The method of any of embodiments 14 through 16 wherein the
control message comprises one or more identifier, where each
identifier identifies a preconfigured SP ZP CSI-RS resource. 17a.
The method of any of embodiments 14 through 17 wherein the one or
more activated SP ZP CSI-RS resources are not used for PDSCH
transmission. 18. A method performed by a wireless device (512) for
activating a Semi-Persistent, SP, Zero Power, ZP, Channel State
Information Reference Signal, CSI-RS, the method comprising: [0146]
receiving (800), from a network node (502), a configuration for SP
CSI Interference Measurement, CSI-IM, resources where all other
wireless devices (512) in a cell comprising the wireless device
(512) receive the same configuration; and [0147] determining (802)
whether to rate match around the SP CSI-IM resources. 19. The
method of embodiment 18 wherein determining whether to rate match
around the SP CSI-IM resources comprises always determining to rate
match around the SP CSI-IM resources. 20. The method of embodiment
18 wherein determining whether to rate match around the SP CSI-IM
resources comprises determining to rate match around the SP CSI-IM
resources if at least one of the other wireless devices (512) in
the cell has an active SP CSI. 21. The method of embodiment 18
wherein determining whether to rate match around the SP CSI-IM
resources comprises determining to rate match around the SP CSI-IM
resources if at least one of the other wireless devices (512) in
the cell has an active SP CSI at the same time as the SP CSI-IM
resources to rate match around. 22. The method of any of the
previous embodiments, further comprising: [0148] providing user
data; and [0149] forwarding the user data to a host computer via
the transmission to the base station.
Group B Embodiments
[0150] 23. A method performed by a base station (502) for
activating a semi-persistent Physical Downlink Shared Channel,
PDSCH, mapping rule, the method comprising: [0151] transmitting
(600), to a wireless device (512), a control message to activate a
Semi-Persistent, SP, PDSCH mapping rule. 24. The method of
embodiment 23 where the control message is a Medium Access Control,
MAC, Control Element, CE. 25. The method of embodiment 23 or 24
further comprising: [0152] using the control message to also
activate at least one of a preconfigured SP Channel Measurement
Resource, SP CMR, a preconfigured SP Interference Measurement, IMR,
and a preconfigured SP Channel State Information, SP CSI, report.
26. The method of any of embodiments 23 to 25 wherein the
activation of a SP PDSCH mapping rule comprises activation of a
preconfigured SP Zero Power, ZP, CSI-RS resource. 27. The method of
embodiment 24, wherein the control message contains a first
identifier that identifies at least one of a preconfigured SP
Channel Measurement Resource, CMR, a preconfigured SP Interference
Measurement, IMR, and a preconfigured SP Zero Power, ZP, Channel
State Information Reference Signal, CSI-RS, and wherein,
optionally, the control message contains a second identifier that
identifies the preconfigured SP CSI report. 28. The method of
embodiment 27 wherein when the first identifier identifies at least
both the preconfigured SP IMR and the preconfigured SP ZP CSI-RS,
the wireless device is instructed not to map PDSCH to the resources
occupied by the preconfigured SP IMR. 29. The method of embodiment
27 wherein when the first identifier does not identify the
preconfigured SP ZP CSI-RS but identifies at least the
preconfigured SP IMR, the wireless device is instructed to map
PDSCH to the resources occupied by the preconfigured SP IMR. 30.
The method of any of embodiments 27 through 29 wherein the first
identifier is either a MeasLinkConfig or a ReportConfig parameter.
31. The method of any of embodiments 23 through 26 wherein
activating the PDSCH mapping rule comprises transmitting a control
message containing an identifier bit which indicates to the
wireless device whether to map PDSCH to the resources occupied by
the preconfigured SP IMR. 32. The method of embodiment 31 wherein
the control message contains a first identifier that identifies at
least one of the preconfigured SP CMR, the preconfigured SP IMR,
and the preconfigured SP ZP CSI-RS, and wherein, optionally, the
control message contains a second identifier that identifies the
preconfigured SP CSI report; and, optionally, [0153] if the
identifier bit is set to "1" or TRUE, then the PDSCH is not mapped
to the resources of the SP CSI Interference Measurement, CSI-IM;
and [0154] if the identifier bit is set to "0" or FALSE, then the
PDSCH is mapped to the resources of the SP CSI-IM. 33. The method
of embodiment 31 or 32 wherein the identifier bit is an R1 bit in
the control message. 34. The method of any of embodiments 23
through 33 wherein the SP IMR is a SP CSI-IM. 35. The method of any
of embodiments 24 through 34 wherein the SP CMR is a SP CSI-RS. 36.
A method performed by a base station (502) for activating a
Semi-Persistent, SP, Zero Power, ZP, Channel State Information
Reference Signal, CSI-RS, the method comprising: [0155]
transmitting (700), to a wireless device (512), a control message
that indicates the activation of one or more SP ZP CSI-RS
resources. 37. The method of embodiment 36 where the control
message is a Medium Access Control, MAC, Control Element, CE. 38.
The method of embodiment 36 or 37 wherein the control message
comprises a bitmap, wherein each bit in the bitmap indicates if one
SP ZP CSI-RS resource is active or not. 39. The method of any of
embodiments 36 through 38 wherein the control message comprises one
or more identifiers, where each identifier identifies a
preconfigured SP ZP CSI-RS resource. 40. A method performed by a
base station (502) for activating a Semi-Persistent, SP, Zero
Power, ZP, Channel State Information Reference Signal, CSI-RS, the
method comprising: [0156] transmitting (800), to a wireless device
(512), a configuration for SP CSI Interference Measurement, CSI-IM,
resources where all other wireless devices (512) in a cell
comprising the wireless device (512) receive the same
configuration. 41. The method of any of the previous embodiments,
further comprising: [0157] obtaining user data; and [0158]
forwarding the user data to a host computer or a wireless
device.
Group C Embodiments
[0159] 42. A wireless device for activating a Semi-Persistent, SP,
Physical Downlink Shared Channel, PDSCH, mapping rule, and/or for
activating a SP Zero Power, ZP, Channel State Information Reference
Signal, CSI-RS, the wireless device comprising: [0160] processing
circuitry configured to perform any of the steps of any of the
Group A embodiments; and [0161] power supply circuitry configured
to supply power to the wireless device. 43. A base station for
activating a Semi-Persistent, SP, Physical Downlink Shared Channel,
PDSCH, mapping rule, and/or for activating a SP Zero Power, ZP,
Channel State Information Reference Signal, CSI-RS, the base
station comprising: [0162] processing circuitry configured to
perform any of the steps of any of the Group B embodiments; and
[0163] power supply circuitry configured to supply power to the
wireless device. 44. A User Equipment, UE, for activating a
Semi-Persistent, SP, Physical Downlink Shared Channel, PDSCH
mapping rule, and/or for activating a SP Zero Power, ZP, Channel
State Information Reference Signal, CSI-RS, the UE comprising:
[0164] an antenna configured to send and receive wireless signals;
[0165] radio front-end circuitry connected to the antenna and to
processing circuitry, and configured to condition signals
communicated between the antenna and the processing circuitry;
[0166] the processing circuitry being configured to perform any of
the steps of any of the Group A embodiments; [0167] an input
interface connected to the processing circuitry and configured to
allow input of information into the UE to be processed by the
processing circuitry; [0168] an output interface connected to the
processing circuitry and configured to output information from the
UE that has been processed by the processing circuitry; and [0169]
a battery connected to the processing circuitry and configured to
supply power to the UE. 45. A communication system including a host
computer comprising: [0170] processing circuitry configured to
provide user data; and [0171] a communication interface configured
to forward the user data to a cellular network for transmission to
a User Equipment, UE; [0172] wherein the cellular network comprises
a base station having a radio interface and processing circuitry,
the base station's processing circuitry configured to perform any
of the steps of any of the Group B embodiments. 46. The
communication system of the pervious embodiment further including
the base station. 47. The communication system of the previous 2
embodiments, further including the UE, wherein the UE is configured
to communicate with the base station. 48. The communication system
of the previous 3 embodiments, wherein: [0173] the processing
circuitry of the host computer is configured to execute a host
application, thereby providing the user data; and [0174] the UE
comprises processing circuitry configured to execute a client
application associated with the host application. 49. A method
implemented in a communication system including a host computer, a
base station, and a User Equipment, UE, the method comprising:
[0175] at the host computer, providing user data; and [0176] at the
host computer, initiating a transmission carrying the user data to
the UE via a cellular network comprising the base station, wherein
the base station performs any of the steps of any of the Group B
embodiments. 50. The method of the previous embodiment, further
comprising, at the base station, transmitting the user data. 51.
The method of the previous 2 embodiments, wherein the user data is
provided at the host computer by executing a host application, the
method further comprising, at the UE, executing a client
application associated with the host application. 52. A User
Equipment, UE, configured to communicate with a base station, the
UE comprising a radio interface and processing circuitry configured
to perform the method of the previous 3 embodiments. 53. A
communication system including a host computer comprising: [0177]
processing circuitry configured to provide user data; and [0178] a
communication interface configured to forward user data to a
cellular network for transmission to a User Equipment, UE; [0179]
wherein the UE comprises a radio interface and processing
circuitry, the UE's components configured to perform any of the
steps of any of the Group A embodiments. 54. The communication
system of the previous embodiment, wherein the cellular network
further includes a base station configured to communicate with the
UE. 55. The communication system of the previous 2 embodiments,
wherein: [0180] the processing circuitry of the host computer is
configured to execute a host application, thereby providing the
user data; and [0181] the UE's processing circuitry is configured
to execute a client application associated with the host
application. 56. A method implemented in a communication system
including a host computer, a base station, and a User Equipment,
UE, the method comprising: [0182] at the host computer, providing
user data; and [0183] at the host computer, initiating a
transmission carrying the user data to the UE via a cellular
network comprising the base station, wherein the UE performs any of
the steps of any of the Group A embodiments. 57. The method of the
previous embodiment, further comprising at the UE, receiving the
user data from the base station. 58. A communication system
including a host computer comprising: [0184] communication
interface configured to receive user data originating from a
transmission from a User Equipment, UE, to a base station; [0185]
wherein the UE comprises a radio interface and processing
circuitry, the UE's processing circuitry configured to perform any
of the steps of any of the Group A embodiments. 59. The
communication system of the previous embodiment, further including
the UE. 60. The communication system of the previous 2 embodiments,
further including the base station, wherein the base station
comprises a radio interface configured to communicate with the UE
and a communication interface configured to forward to the host
computer the user data carried by a transmission from the UE to the
base station. 61. The communication system of the previous 3
embodiments, wherein: [0186] the processing circuitry of the host
computer is configured to execute a host application; and [0187]
the UE's processing circuitry is configured to execute a client
application associated with the host application, thereby providing
the user data. 62. The communication system of the previous 4
embodiments, wherein: [0188] the processing circuitry of the host
computer is configured to execute a host application, thereby
providing request data; and [0189] the UE's processing circuitry is
configured to execute a client application associated with the host
application, thereby providing the user data in response to the
request data. 63. A method implemented in a communication system
including a host computer, a base station, and a User Equipment,
UE, the method comprising: [0190] at the host computer, receiving
user data transmitted to the base station from the UE, wherein the
UE performs any of the steps of any of the Group A embodiments. 64.
The method of the previous embodiment, further comprising, at the
UE, providing the user data to the base station. 65. The method of
the previous 2 embodiments, further comprising: [0191] at the UE,
executing a client application, thereby providing the user data to
be transmitted; and [0192] at the host computer, executing a host
application associated with the client application. 66. The method
of the previous 3 embodiments, further comprising: [0193] at the
UE, executing a client application; and [0194] at the UE, receiving
input data to the client application, the input data being provided
at the host computer by executing a host application associated
with the client application; [0195] wherein the user data to be
transmitted is provided by the client application in response to
the input data. 67. A communication system including a host
computer comprising a communication interface configured to receive
user data originating from a transmission from a User Equipment,
UE, to a base station, wherein the base station comprises a radio
interface and processing circuitry, the base station's processing
circuitry configured to perform any of the steps of any of the
Group B embodiments. 68. The communication system of the previous
embodiment further including the base station. 69. The
communication system of the previous 2 embodiments, further
including the UE, wherein the UE is configured to communicate with
the base station. 70. The communication system of the previous 3
embodiments, wherein: [0196] the processing circuitry of the host
computer is configured to execute a host application; and [0197]
the UE is configured to execute a client application associated
with the host application, thereby providing the user data to be
received by the host computer. 71. A method implemented in a
communication system including a host computer, a base station, and
a User Equipment, UE, the method comprising: [0198] at the host
computer, receiving, from the base station, user data originating
from a transmission which the base station has received from the
UE, wherein the UE performs any of the steps of any of the Group A
embodiments. 72. The method of the previous embodiment, further
comprising at the base station, receiving the user data from the
UE. 73. The method of the previous 2 embodiments, further
comprising at the base station, initiating a transmission of the
received user data to the host computer.
Group D Embodiments
[0199] D1. A Method of activating a Semi-Persistent, SP, Physical
Downlink Shared Channel, PDSCH mapping rule in a wireless device,
the method comprising at least one of: [0200] a. receiving a Medium
Access Control, MAC, Control Element, CE from a network node to
activate a SP PDSCH mapping rule; and [0201] b. using the MAC CE
message to also activate at least one of a preconfigured SP Channel
Measurement Resource, CMR, a preconfigured SP Interference
Measurement Resource, IMR, and a preconfigured SP Channel State
Information, CSI, report. D2. The method of embodiment D1, where
the activation of a SP PDSCH mapping rule comprises activation of a
preconfigured SP Zero Power, ZP, CSI Reference Signal, CSI-RS,
resource. D3. The method of embodiment D2, wherein the MAC CE
message contains a first identifier that identifies at least one of
the preconfigured SP CMR, the preconfigured SP IMR, and the
preconfigured SP ZP CSI-RS, and wherein the MAC CE contains a
second identifier that identifies the preconfigured SP CSI report.
D4. The method of either one of embodiments D2 and D3 wherein when
the first identifier identifies at least both the preconfigured SP
IMR and the preconfigured SP ZP CSI-RS, the wireless device is
instructed not to map PDSCH to the resources occupied by the
preconfigured SP IMR. D5. The method of either one of embodiments
D2 and D3 wherein when the first identifier does not identify the
preconfigured SP ZP CSI-RS but identifies at least the
preconfigured SP IMR, the wireless device is instructed to map
PDSCH to the resources occupied by the preconfigured SP IMR. D6.
The method of embodiments D1 where activating the PDSCH mapping
rule comprises receiving a MAC CE message containing an identifier
bit which indicates to the wireless devise whether to map PDSCH to
the resources occupied by the preconfigured SP IMR. D7. The method
of D1, where the SP CMR is a SP CSI-RS. D8. The method of D1, where
the SP IMR is a SP CSI Interference Measurement, CSI-IM. D9. A
method of activating preconfigured Semi-Persistent, SP, Zero Power,
ZP, Channel State Information Reference Signal, CSI-RS, in a
wireless device, the method comprising receiving a Medium Access
Control, MAC, Control Element, CE, message from a network node
wherein the MAC CE message indicates the activation of one or more
SP ZP CSI-RS resources. D10. The method of D9, where the MAC CE
message comprises a bitmap, wherein each bit in the bitmap
indicates if one SP ZP CSI-RS resource is active or not. D11. The
method of either one of D9-D10, where the MAC CE message comprises
one or more identifier, where each identifier identifies a
preconfigured SP ZP CSI-RS resource.
[0202] At least some of the following abbreviations may be used in
this disclosure. If there is an inconsistency between
abbreviations, preference should be given to how it is used above.
If listed multiple times below, the first listing should be
preferred over any subsequent listing(s).
TABLE-US-00004 3GPP Third Generation Partnership Project 5G Fifth
Generation AP CSI Aperiodic Channel State Information Reference
Signal AP IMR Aperiodic Interference Measurement Resource ASIC
Application Specific Integrated Circuit BWP Bandwidth Parts CC
Component Carrier CE Control Element CMR Channel Management
Resource CPU Central Processing Unit CQI Channel Quality Indicator
CRI Channel State Information-Reference Signal Resource Indicator
CRS Cell Specific Reference Signal CSI Channel State Information
CSI-IM Channel State Information Interference Measurement CSI-RS
Channel State Information Reference Signal DCI Downlink Channel
Information DL Downlink DMRS Demodulation Reference Signal eNB
Enhanced or Evolved Node B FD-MIMO Full Dimension Multi-Input
Multi-Output FPGA Field Programmable Gate Array gNB New Radio Base
Station IE Information Element IMR Interference Measurement
Resource LCID Logical Channel Identifier LTE Long Term Evolution
MAC Medium Access Control MIMO Multiple Input Multiple Output MME
Mobility Management Entity MTC Machine Type Communication NR New
Radio NR-PSS New Radio Primary Synchronization Sequence NR-SSS New
Radio Secondary Synchronization Sequence NZP Non-Zero Power P CSI
Periodic Channel State Information Reference Signal P IMR Periodic
Interference Measurement Resource P/SP Periodic/Semi-Periodic PBCH
Physical Broadcast Channel PDCCH Physical Downlink Control Channel
PDSCH Physical Downlink Shared Channel P-GW Packet Data Network
Gateway PMI Precoding Matrix Indicator PUCCH Physical Uplink
Control Channel PUSCH Physical Uplink Shared Channel QCL Quasi
Co-Location RE Resource Element RI Rank Indicator RRC Radio
Resource Control RS Reference Signal SCEF Service Capability
Exposure Function SP Semi Periodic SP CSI Semi Periodic Channel
State Information SP IMR Semi Periodic Interference Measurement
Resource SS Synchronization Sequence TRP Transmission Reception
Point Tx Transmission UE User Equipment ZP Zero Power
[0203] Those skilled in the art will recognize improvements and
modifications to the embodiments of the present disclosure. All
such improvements and modifications are considered within the scope
of the concepts disclosed herein.
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