U.S. patent application number 16/730893 was filed with the patent office on 2020-08-06 for full dimension multiple input multiple output communication systems and methods.
The applicant listed for this patent is Apple Inc.. Invention is credited to Alexei Davydov.
Application Number | 20200252109 16/730893 |
Document ID | 20200252109 / US20200252109 |
Family ID | 1000004767679 |
Filed Date | 2020-08-06 |
Patent Application | download [pdf] |
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United States Patent
Application |
20200252109 |
Kind Code |
A1 |
Davydov; Alexei |
August 6, 2020 |
Full Dimension Multiple Input Multiple Output Communication Systems
and Methods
Abstract
Apparatuses and methods are disclosed for supporting a UE in
reporting of a selection of an NZP CSI-RS resource to an eNB
supporting FD-MIMO communication. Each NZP CSI-RS resource is
associated with a unique NZP CRI (or `Beam Index`) on a given
serving cell. The UE may select an NZP CSI-RS resource for CSI
calculation and reporting to the eNB based on processed CSI-RS
signals received at an antenna of the UE from the eNB of a serving
cell of the UE based on a CSI-RS resource configuration for the UE
signaled from the eNB. The UE may report a CRI and a CSI of the
selected NZP CSI-RS resource to the eNB of the serving cell of the
UE based on a CRI reporting configuration of the UE signaled from
the eNB.
Inventors: |
Davydov; Alexei; (Nizhny
Novgorod, RU) |
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Applicant: |
Name |
City |
State |
Country |
Type |
Apple Inc. |
Cupertino |
CA |
US |
|
|
Family ID: |
1000004767679 |
Appl. No.: |
16/730893 |
Filed: |
December 30, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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15765695 |
Apr 3, 2018 |
10523285 |
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PCT/US2016/025711 |
Apr 1, 2016 |
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16730893 |
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62251621 |
Nov 5, 2015 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04B 7/0417 20130101;
H04B 7/0647 20130101; H04L 5/0094 20130101; H04B 7/0695 20130101;
H04B 7/063 20130101; H04L 5/005 20130101; H04B 7/0478 20130101 |
International
Class: |
H04B 7/0417 20060101
H04B007/0417; H04L 5/00 20060101 H04L005/00; H04B 7/06 20060101
H04B007/06; H04B 7/0456 20060101 H04B007/0456 |
Claims
1. One or more non-transitory, computer-readable media having
instructions that, when executed by one or more processors, cause a
user equipment (UE) to: process Channel State Information Reference
Signal (CSI-RS) signals received at an antenna of the UE from an
eNodeB (eNB), which supports Full Dimension Multiple Input Multiple
Output (FD-MIMO) communication, of a serving cell of the UE based
on a CSI-RS resource configuration for the UE signaled from the eNB
in which two or more Non-Zero Power (NZP) CSI-RS resources are
configured for the UE and in which each NZP CSI-RS resource is
associated with a unique NZP CSI-RS Resource Indication (CRI) on a
given serving cell; select an NZP CSI-RS resource for channel state
information (CSI) calculation and reporting to the eNB based on the
processing of the received CSI-RS signals; and report a CRI and a
CSI of the selected NZP CSI-RS resource to the eNB of the serving
cell of the UE based on a CRI reporting configuration of the UE
signaled from the eNB.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] The present application claims priority to U.S. Provisional
Patent Application No. 62/251,621, filed Nov. 5, 2015, entitled
"BEAM INDEX REPORTING FOR LTE"; the entire disclosure of which are
hereby incorporated by reference.
BACKGROUND
[0002] There is an ever increasing demand for network capacity as
the number of wireless devices increases. With that increasing
demand for capacity and increasing user equipment (UE) numbers
comes a greater need for spectrum management, in terms of, for
example, spectral efficiency and mitigating interference. Various
techniques exist for increasing the traffic carrying capacity of a
channel or cell. Those techniques comprise assigning subcarriers to
specific user equipments, using multiple access techniques such as
Orthogonal Frequency Division Multiple Access (OFDMA) and Single
Carrier Frequency Division Multiple Access (SC-FDMA) in, for
example, Long Term Evolution (LTE) and Long Term Evolution Advanced
(LTE-A).
[0003] Other techniques also exist such as, for example,
beamforming in which radio energy is transmitted in directional
manner. A number of antennas can be arranged to produce a resulting
beam pattern comprising lobes and nulls that can be used to improve
signal to noise ratios and signal to noise plus interference
ratios. Beamforming supports multi-user communications and, in
particular, the antennas can be used to support multiple-input
multiple output (MIMO) communications such as, for example,
multi-user MIMO (MU-MIMO).
BRIEF DESCRIPTION OF THE DRAWINGS
[0004] Aspects, features and advantages of embodiments will become
apparent from the following description given in reference to the
appended drawings in which like numerals denote like elements and
in which:
[0005] FIG. 1 illustrates an eNB and number of UEs;
[0006] FIG. 2 shows a pattern for CSI-RS;
[0007] FIG. 3 is schematic block diagram illustrating an eNB;
[0008] FIG. 4 is a schematic block diagram illustrating a UE;
[0009] FIG. 5 is a schematic block diagram illustrating some parts
of the UE in more detail;
[0010] FIG. 6 shows a table mapping an offset;
[0011] FIG. 7 shows a pattern for a CRI report; and
[0012] FIG. 8 shows a table mapping a periodicity and an
offset;
[0013] FIG. 9 depicts a flow diagram of processing operations
associated with CRI reporting in a UE;
[0014] FIG. 10 depicts a flow diagram of processing operations
associated with CRI reporting in an eNB;and
[0015] FIG. 11 a schematic block diagram illustrating some
components of an UE.
DETAILED DESCRIPTION
[0016] The following detailed description refers to the
accompanying drawings. The same reference numbers may be used in
different drawings to identify the same or similar elements. In the
following description, for purposes of explanation and not
limitation, specific details are set forth such as particular
structures, architectures, interfaces, techniques, etc. in order to
provide a thorough understanding of the various aspects of the
example embodiments. However, it will be apparent to those skilled
in the art having the benefit of the present disclosure that the
various aspects of the example embodiments may be practiced in
other examples that depart from these specific details. In certain
instances, descriptions of well-known devices, circuits, and
methods are omitted so as not to obscure the description of the
present example embodiments with unnecessary detail.
[0017] Elevation Beamforming/Full Dimensional (FD) MIMO
[0018] Multiple input and multiple output (MIMO) systems are used
to improve the robustness of data transmission and increase data
rates. MIMO antennas operate by breaking high data rate signals
into multiple lower data rate signals in transmit mode that are
recombined at the receiver. A MIMO system typically consists of m
transmit antennas and n receive antennas. In MIMO systems, a
transmitter sends multiple streams by multiple transmit antennas.
The transmit streams go through a matrix channel which consists of
all m.n paths between the m transmit antennas at the transmitter
and n receive antennas at the receiver. The receiver receives a
signal y that results when the input signal vector x is multiplied
by a transmission channel matrix H.
y = Hx where H = [ h 1 1 h 1 2 h .. h 1 m h 21 h 2 2 h .. h 2 m h
.. h .. h .. h . m h n 1 h n 2 h n . h n m ] ##EQU00001##
[0019] The receiver gets the received signal vectors y by the
multiple receive antennas and decodes the received signal vectors
into the original information. Transmission matrix H contains the
channel impulse responses hnm, which reference the channel between
the transmit antenna m and the receive antenna n. Many MIMO
algorithms are based on the analysis of transmission matrix H
characteristics. The rank (of the channel matrix) defines the
number of linearly independent--or orthogonal--rows or columns in
H. It indicates how many independent data streams or "layers" can
be transmitted simultaneously, which impacts the channel capacity
of the transmission channel.
[0020] Beamforming uses multiple antennas to control the direction
of a wavefront by appropriately weighting the magnitude and phase
of individual antenna signals (transmit beamforming) to create a
localized, directed, spatially selective beam through constructive
interference, as opposed to an omnidirectional beam. An array gain
(also called beamforming gain) is achieved because every single
antenna in the array makes a contribution to the steered signal.
Beamforming thus permits targeted illumination of specific areas,
making it possible to improve transmission to users at the far
reaches of cell coverage.
[0021] Various developments have been made to include in standards
for wireless radio telecommunications released by the 3rd
generation partnership project (3GPP) various MIMO and beamforming
techniques to improve channel capacity and spectral efficiency for
downlink. The different scenarios for transmission in the downlink
are defined by a number of Transmission Modes (TMs). The
transmission modes supporting MIMO and beamforming will now be
briefly described.
[0022] In 3rd generation partnership project (3GPP) release 8
(Rel-8), multiple input and multiple output (MIMO) supporting
beamforming based on the user-specific reference signals was
introduced by which a base station, or eNodeB (eNB) in LTE,
operating in Transmission Mode (TM) 7 (TM7) can operate a smart
antenna to beamform its transmissions to specific UEs to take
advantage of spatial multiplexing of downlink data to increase
efficiency. Subsequent MIMO enhancements in release 9 (Rel-9),
release 10 (Rel-10) and release 11 (Rel-11) added further
transmission modes TM8, TM9 and TM10 respectively.
[0023] In TM9, Downlink Channel State Information Reference Signals
(CSI-RS) and Demodulation Reference Signals (DMRS) were introduced
supporting eight layer spatial multiplexing. In TM 9, and
subsequently introduced transmission mode TM10, a UE-specific
CSI-RS, transmitted by an eNB, is used by a UE to measure,
calculate and report Channel State Information (CSI) as feedback to
the eNB as Uplink Control Information (UCI) in a closed loop
operation mode, from which the eNB configures the downlink for the
UE.
[0024] In Rel-10 and Rel-11 CSI includes Channel Quality Indication
(CQI) which indicates to the eNB a highest modulation and a code
rate that can lead to an acceptable error rate in the channel, the
Precoding Matrix Indicator (PMI) which indicates to the eNB a
suitable precoding matrix for the mapping of the layers to the
antennas of the eNB, which can maximize the retrieval of data bits
across all the layers, and the Rank Indicator (RI) which indicates
the channel rank or the number or layers and signal streams in the
downlink MIMO transmission in which the channel capacity across the
all the downlink channels can be maximized. The bit size of the RI
report depends on the channel rank for the CSI-RS.
[0025] LTE Rel-8 to Rel-11 TM8, TM9 and TM10 are designed to
support antenna configurations at the eNB that are capable of
adaptation in azimuth. No support is provided in these
specifications for beamforming in any direction other than
azimuth.
[0026] In LTE Rel-13, a RAN1 work item relating to Full Dimension
MIMO (FD-MIMO) has signaled interest in enhancing system
performance through the use of antenna systems having a
two-dimensional array structure that provides adaptive control over
the azimuth dimension and also the elevation dimension.
[0027] The additional control over the elevation dimension of
FD-MIMO enables a variety of strategies such as sector-specific
elevation beamforming (e.g., adaptive control over the vertical
pattern beamwidth and/or downtilt), advanced sectorization in the
vertical domain, and user-specific elevation beamforming. Vertical
sectorization can improve average system performance through the
higher gain of the vertical sector patterns, but vertical
sectorization generally does not need additional standardization
support. User equipment (UE)-specific elevation beamforming offered
by FD-MIMO promises to increase the
signal-to-interference-plus-noise (SINR) statistics seen by the UEs
by pointing the vertical antenna pattern in the direction of the UE
while spraying less interference to adjacent sectors by virtue of
being able to steer the transmitted energy in elevation. The
effects of FD-MIMO will be particularly beneficial for urban
settings where antenna are mounted below roof height.
[0028] Example embodiments disclose certain communications systems
and methods for supporting FD-MIMO, particularly concerning the
feedback from the UE to the eNB of a selection of a CSI-RS resource
from among plural CSI-RS resources configured for the UE.
[0029] As shown in FIG. 1, to support FD-MIMO, an eNB 110 transmits
multiple CSI-RS resources beamformed to have different elevations
(e.g. as sectors) which are incident on, e.g. a building 130 in
which a UE 120 of plural UEs is present. In the example, four
CSI-RS resources are configured for the UE, CSI-RS1, CSI-RS2,
CSI-RS3, CSI-RS4.
[0030] The configuration of the CSI-RS resources for the UE 120 is
set by the eNB and signaled to the UE in Downlink Control
Information (DCI). For FD-MIMO beamforming, two or more non-zero
power (NZP) CSI-RS with Nk={1,2,4,8} antenna ports are configured
by the eNB for the UE. Up to eight CSI-RS can be configured for a
UE. The eight antenna ports for the CSI-RS resources are referred
to as antenna port 15 to antenna port 22.
[0031] The CSI-RS are transmitted by the eNB in a single subframe
at periodicities of at least every eighth frame, and up to twice
every frame. FIG. 2 shows the pattern for the symbol positions of
CSI-RS signals in a single subframe for 2, 4 and 8 CSI-RS, where
ports 0-7 corresponds to CSI-RS ports 15-22 respectively. In each,
the 40 resource elements carrying numbers representing the antenna
ports indicate the reference symbols for CSI-RS allocation. As can
be seen from FIG. 2, where two CSI-RS are configured, as shown in
the leftmost pane a CSI-RS consists of two consecutive reference
symbols (each indicated by ports 0 and 1 in consecutive resource
elements), giving 20 possible CSI-RS configurations in a resource
block pair. Where four CSI-RS are configured, as shown in the
middle pane the CSI-RS are pair-wise multiplexed (with each
configuration being indicated by dedicated ports 0 and 1 in
consecutive resource elements and ports 3 and 4 in another pair of
consecutive resource elements), giving 10 CSI-RS configurations.
Similarly, where eight CSI-RS are configured, as shown in the
rightmost pane there are 5 CSI-RS configurations (each carrying
eight ports indicated as ports 0-7).
[0032] The CSI-RS structure for configurations where there are a
different number of antenna ports for different CSI-RS resources
has a nested structure, i.e. CSI-RS resources corresponding to the
lower number of antenna ports is subset of CSI-RS resource of
CSI-RS pattern corresponding to higher number of CSI-RS antenna
ports. The parameters of CSI-RS are configured to the UE using
higher layer signaling.
[0033] In embodiments, for supporting the reporting of the CRI in
FD-MIMO, each NZP CSI-RS resource is associated with a unique NZP
CSI-RS Resource Indication (CRI) (or `Beam Index`) on a given
serving cell. A UE, based on channel measurement of the configured
CSI-RS resources for that UE, selects one NZP CSI-RS resource and
provides to the eNB as Uplink Control Information (UCI) CSI
information (i.e. reports of RI, CQI and PMI) along with a report
indicating the selected NZP CSI-RS resource (so called CSI-RS
Resource Indicator (CRI), or otherwise known as "beam index" or
"BI").
[0034] Given that CRI is a new type of uplink control information
(UCI), and that there are dependencies between the CRI and CSI
(i.e. RI, CQI and PMI), there are a number of considerations and
challenges as to how the CRI and CSI should be reported in a robust
and efficient manner that facilitates coding and decoding by the UE
and eNB. The example embodiments thus provide systems and methods
of CRI reporting considering both periodic and aperiodic CSI
reporting schemes. The arrangement and processes for the operation
of the UEs 120 and the eNB 110 for supporting the UE 120 in
reporting of a selection of a NZP CSI-RS resource to the eNB 110
supporting Full Dimension Multiple Input Multiple Output (FD-MIMO)
communication in accordance with the example embodiments will be
described in detail below. Firstly, the components of the eNodeB
and the UE will be described with respect to FIGS. 3 and 4.
[0035] FIG. 3 illustrates for one embodiment, example components of
an eNB, for example, eNB 110 in FIG. 1. The eNB comprises a
wireless transmission block 301 for communicating wirelessly with
UEs such as, for example, smartphones, and portable devices
described with respect to FIG. 1. The transmission block 301 has an
associated antenna 302 and may have a number of antennas for
multiple-input and multiple-output (MIMO) operation. A network
transmission block 303 may be provided, which supports network
communications such as communication with, for example, the
components of the core network (not shown) 110 or any other network
entity. The eNB can comprise, therefore, a network connection 304
such as, for example, the communication link with the core network.
A processor 305 is provided for controlling overall operations of
the eNB. The processor 305 can comprise a number of processors,
and/or one or more multi-core processors. The processor 305
operates in accordance with software 306 stored within a processor
readable, or processor accessible, memory or storage 307. The
software 306 is arranged so that the eNB can implement the examples
described herein, and, in particular, can implement the eNB aspects
of the apparatuses and methods described herein. The memory 307 may
store data and software defining routines for implementing sensing,
inter-cell interference coordination (ICIC), mobility, access
control, radio resource management (RRM) and scheduler functions.
The memory 307 may also comprise elements of a protocol stack such
as, for example, elements of an evolved universal terrestrial radio
access network (EUTRAN) protocol including, for example, physical
(PHY), media access control (MAC), radio link control (RLC), packet
data convergence protocol (PDCP), and/or radio resource control
(RRC) elements. The memory/storage may include any combination of
suitable volatile memory and/or non-volatile memory. In some
embodiments wireless transmission block 301 of the eNB can be in
included a separate device. FIG. 4 illustrates, for one embodiment,
example components of an electronic device. In embodiments, the
electronic device may be, implement, be incorporated into, or
otherwise be a part of a UE, an evolved NodeB (eNB), or some other
electronic device. It may, for example, be a UE 120 or eNB 110 of
FIG. 1. In some embodiments, the electronic device may include
application circuitry 402, baseband circuitry 404, radio frequency
(RF) circuitry 406, front-end module (FEM) circuitry 408 and one or
more antennas 410, coupled together at least as shown.
[0036] The application circuitry 402 may include one or more
application processors. For example, the application circuitry 402
may include circuitry such as, but not limited to, one or more
single-core or multi-core processors. The processor(s) may include
any combination of general-purpose processors and dedicated
processors (e.g., graphics processors, application processors,
etc.). The processors may be coupled with and/or may include
memory/storage and may be configured to execute instructions stored
in the memory/storage to enable various applications and/or
operating systems to run on the system.
[0037] The baseband circuitry 404 may include circuitry such as,
but not limited to, one or more single-core or multi-core
processors. The baseband circuitry 404 may include one or more
baseband processors and/or control logic to process baseband
signals received from a receive signal path of the RF circuitry 406
and to generate baseband signals for a transmit signal path of the
RF circuitry 406. Baseband processing circuity 404 may interface
with the application circuitry 402 for generation and processing of
the baseband signals and for controlling operations of the RF
circuitry 406. For example, in some embodiments, the baseband
circuitry 404 may include a second generation (2G) baseband
processor 404a, third generation (3G) baseband processor 404b,
fourth generation (4G) baseband processor 404c, and/or other
baseband processor(s) 404d for other existing generations,
generations in development or to be developed in the future (e.g.,
fifth generation (5G), 6G, etc.). The baseband circuitry 404 (e.g.,
one or more of baseband processors 404a-d) may handle various radio
control functions that enable communication with one or more radio
networks via the RF circuitry 406. The radio control functions may
include, but are not limited to, signal modulation/demodulation,
encoding/decoding, radio frequency shifting, etc. In some
embodiments, modulation/demodulation circuitry of the baseband
circuitry 404 may include Fast-Fourier Transform (FFT), precoding,
and/or constellation mapping/demapping functionality. In some
embodiments, encoding/decoding circuitry of the baseband circuitry
404 may include convolution, tail-biting convolution, turbo,
Viterbi, and/or Low Density Parity Check (LDPC) encoder/decoder
functionality. Embodiments of modulation/demodulation and
encoder/decoder functionality are not limited to these examples and
may include other suitable functionality in other embodiments.
[0038] In some embodiments, the baseband circuitry 404 may include
elements of a protocol stack such as, for example, elements of an
evolved universal terrestrial radio access network (EUTRAN)
protocol including, for example, physical (PHY), media access
control (MAC), radio link control (RLC), packet data convergence
protocol (PDCP), and/or radio resource control (RRC) elements. A
central processing unit (CPU) 404e of the baseband circuitry 304
may be configured to run elements of the protocol stack for
signaling of the PHY, MAC, RLC, PDCP and/or RRC layers. In some
embodiments, the baseband circuitry may include one or more audio
digital signal processor(s) (DSP) 404f. The audio DSP(s) 404f may
include elements for compression/decompression and echo
cancellation and may include other suitable processing elements in
other embodiments.
[0039] The baseband circuitry 404 may further include
memory/storage 404g. The memory/storage 404g may be used to load
and store data and/or instructions for operations performed by the
processors of the baseband circuitry 304. Memory/storage for one
embodiment may include any combination of suitable volatile memory
and/or non-volatile memory. The memory/storage 404g may include any
combination of various levels of memory/storage including, but not
limited to, read-only memory (ROM) having embedded software
instructions (e.g., firmware), random access memory (e.g., dynamic
random access memory (DRAM)), cache, buffers, etc. The
memory/storage 404g may be shared among the various processors or
dedicated to particular processors.
[0040] Components of the baseband circuitry may be suitably
combined in a single chip, a single chipset, or disposed on a same
circuit board in some embodiments. In some embodiments, some or all
of the constituent components of the baseband circuitry 404 and the
application circuitry 402 may be implemented together such as, for
example, on a system on a chip (SOC).
[0041] In some embodiments, the baseband circuitry 404 may provide
for communication compatible with one or more radio technologies.
For example, in some embodiments, the baseband circuitry 404 may
support communication with an evolved universal terrestrial radio
access network (EUTRAN) and/or other wireless metropolitan area
networks (WMAN), a wireless local area network (WLAN), a wireless
personal area network (WPAN). Embodiments in which the baseband
circuitry 404 is configured to support radio communications of more
than one wireless protocol may be referred to as multi-mode
baseband circuitry. RF circuitry 406 may enable communication with
wireless networks using modulated electromagnetic radiation through
a non-solid medium. In various embodiments, the RF circuitry 406
may include switches, filters, amplifiers, etc. to facilitate the
communication with the wireless network. RF circuitry 406 may
include a receive signal path which may include circuitry to
down-convert RF signals received from the FEM circuitry 408 and
provide baseband signals to the baseband circuitry 404. RF
circuitry 406 may also include a transmit signal path which may
include circuitry to up-convert baseband signals provided by the
baseband circuitry 404 and provide RF output signals to the FEM
circuitry 408 for transmission.
[0042] In some embodiments, the RF circuitry 406 may include a
receive signal path and a transmit signal path. The receive signal
path of the RF circuitry 406 may include mixer circuitry 406a,
amplifier circuitry 406b and filter circuitry 406c. The transmit
signal path of the RF circuitry 406 may include filter circuitry
406c and mixer circuitry 406a. RF circuitry 406 may also include
synthesizer circuitry 406d for synthesizing a frequency for use by
the mixer circuitry 406a of the receive signal path and the
transmit signal path. In some embodiments, the mixer circuitry 406a
of the receive signal path may be configured to down-convert RF
signals received from the FEM circuitry 408 based on the
synthesized frequency provided by synthesizer circuitry 406d. The
amplifier circuitry 406b may be configured to amplify the
down-converted signals and the filter circuitry 406c may be a
low-pass filter (LPF) or band-pass filter (BPF) configured to
remove unwanted signals from the down-converted signals to generate
output baseband signals. Output baseband signals may be provided to
the baseband circuitry 404 for further processing. In some
embodiments, the output baseband signals may be zero-frequency
baseband signals, although this is not a requirement. In some
embodiments, mixer circuitry 406a of the receive signal path may
comprise passive mixers, although the scope of the embodiments is
not limited in this respect.
[0043] In some embodiments, the mixer circuitry 406a of the
transmit signal path may be configured to up-convert input baseband
signals based on the synthesized frequency provided by the
synthesizer circuitry 406d to generate RF output signals for the
FEM circuitry 408. The baseband signals may be provided by the
baseband circuitry 404 and may be filtered by filter circuitry
406c. The filter circuitry 406c may include a low-pass filter
(LPF), although the scope of the embodiments is not limited in this
respect.
[0044] In some embodiments, the mixer circuitry 406a of the receive
signal path and the mixer circuitry 406a of the transmit signal
path may include two or more mixers and may be arranged for
quadrature downconversion and/or upconversion respectively. In some
embodiments, the mixer circuitry 406a of the receive signal path
and the mixer circuitry 406a of the transmit signal path may
include two or more mixers and may be arranged for image rejection
(e.g., Hartley image rejection). In some embodiments, the mixer
circuitry 406a of the receive signal path and the mixer circuitry
406a may be arranged for direct downconversion and/or direct
upconversion, respectively. In some embodiments, the mixer
circuitry 406a of the receive signal path and the mixer circuitry
406a of the transmit signal path may be configured for
super-heterodyne operation.
[0045] In some embodiments, the output baseband signals and the
input baseband signals may be analog baseband signals, although the
scope of the embodiments is not limited in this respect. In some
alternate embodiments, the output baseband signals and the input
baseband signals may be digital baseband signals. In these
alternate embodiments, the RF circuitry 406 may include
analog-to-digital converter (ADC) and digital-to-analog converter
(DAC) circuitry and the baseband circuitry 404 may include a
digital baseband interface to communicate with the RF circuitry
406.
[0046] In some dual-mode embodiments, a separate radio IC circuitry
may be provided for processing signals for each spectrum, although
the scope of the embodiments is not limited in this respect.
[0047] In some embodiments, the synthesizer circuitry 406d may be a
fractional-N synthesizer or a fractional N/N+1 synthesizer,
although the scope of the embodiments is not limited in this
respect as other types of frequency synthesizers may be suitable.
For example, synthesizer circuitry 406d may be a delta-sigma
synthesizer, a frequency multiplier, or a synthesizer comprising a
phase-locked loop with a frequency divider.
[0048] The synthesizer circuitry 406d may be configured to
synthesize an output frequency for use by the mixer circuitry 406a
of the RF circuitry 406 based on a frequency input and a divider
control input. In some embodiments, the synthesizer circuitry 406d
may be a fractional N/N+1 synthesizer.
[0049] In some embodiments, frequency input may be provided by a
voltage controlled oscillator (VCO), although that is not a
requirement. Divider control input may be provided by either the
baseband circuitry 404 or the applications processor 402 depending
on the desired output frequency. In some embodiments, a divider
control input (e.g., N) may be determined from a look-up table
based on a channel indicated by the applications processor 402.
[0050] Synthesizer circuitry 406d of the RF circuitry 406 may
include a divider, a delay-locked loop (DLL), a multiplexer and a
phase accumulator. In some embodiments, the divider may be a dual
modulus divider (DMD) and the phase accumulator may be a digital
phase accumulator (DPA). In some embodiments, the DMD may be
configured to divide the input signal by either N or N+1 (e.g.,
based on a carry out) to provide a fractional division ratio. In
some example embodiments, the DLL may include a set of cascaded,
tunable, delay elements, a phase detector, a charge pump and a
D-type flip-flop. In these embodiments, the delay elements may be
configured to break a VCO period up into Nd equal packets of phase,
where Nd is the number of delay elements in the delay line. In this
way, the DLL provides negative feedback to help ensure that the
total delay through the delay line is one VCO cycle.
[0051] In some embodiments, synthesizer circuitry 406d may be
configured to generate a carrier frequency as the output frequency,
while in other embodiments, the output frequency may be a multiple
of the carrier frequency (e.g., twice the carrier frequency, four
times the carrier frequency) and used in conjunction with
quadrature generator and divider circuitry to generate multiple
signals at the carrier frequency with multiple different phases
with respect to each other. In some embodiments, the output
frequency may be a LO frequency (fLO). In some embodiments, the RF
circuitry 406 may include an IQ/polar converter. FEM circuitry 408
may include a receive signal path which may include circuitry
configured to operate on RF signals received from one or more
antennas 410, amplify the received signals and provide the
amplified versions of the received signals to the RF circuitry 406
for further processing. FEM circuitry 408 may also include a
transmit signal path which may include circuitry configured to
amplify signals for transmission provided by the RF circuitry 406
for transmission by one or more of the one or more antennas
410.
[0052] In some embodiments, the FEM circuitry 408 may include a
TX/RX switch to switch between transmit mode and receive mode
operation. The FEM circuitry may include a receive signal path and
a transmit signal path. The receive signal path of the FEM
circuitry may include a low-noise amplifier (LNA) to amplify
received RF signals and provide the amplified received RF signals
as an output (e.g., to the RF circuitry 406). The transmit signal
path of the FEM circuitry 408 may include a power amplifier (PA) to
amplify input RF signals (e.g., provided by RF circuitry 406), and
one or more filters to generate RF signals for subsequent
transmission (e.g., by one or more of the one or more antennas
410.
[0053] In some embodiments, the electronic device 130 may include
additional elements such as, for example, memory/storage, display,
camera, sensor, and/or input/output (I/O) interface.
[0054] When the electronic device of FIG. 4 is an UE, the circuitry
may be operable to communicate with an eNB via an uplink and
downlink radio interface. In some embodiments, the electronic
device of FIG. 4 may be configured to perform one or more methods,
processes, and/or techniques as described herein, or portions
thereof. The electronic device may implement the examples described
herein, and, in particular, can implement the UE aspects of the
flowcharts and flow diagrams described herein.
[0055] Although an embodiment of an eNB has been described with
respect to FIG. 3 and an embodiment of a UE has been described with
respect to FIG. 4, FIG. 4 may alternatively illustrate, for one
embodiment, example components of an eNB or some other electronic
device in the system 100.
[0056] Embodiments to enabling mechanisms for UEs to select CSI-RS
resources configured for the UE and transmitted by the eNB, and for
reporting the selected CRI and the related CSI will now be
described in more detail. Two overarching mechanisms for CRI
reporting will be described, with a number of embodiments thereof,
aperiodic reporting and periodic reporting. In various embodiments
the UE may comprise circuitry to report the CRI in according with
the mechanisms of periodic and/or aperiodic reporting described
herein
[0057] The LTE protocol stacks used by the UE and/or eNB are
divided into a number of system operation layers and the different
layers, as will be known by the person skilled in the art, are
referred to in places herein to describe examples of how processes,
mechanisms and techniques can be implemented. However, it will be
appreciated that other implementations are possible and
corresponding layers and protocols in future 3GPP networks may be
used in implementations based on those future 3GPP networks.
Moreover, examples of computer program instructions and data stored
in memory of the UE and the eNB will be described with respect to
FIG. 5 to illustrate how some processes, mechanisms and techniques
can be implemented. However, it will be appreciated that these are
just examples and other implementations and alternatively
arrangements of data and instructions are contemplated.
[0058] CSI-RS Resource Indicator (CRI) Reporting
[0059] In more detail, with reference to FIG. 5, circuitry 500 of a
smart phone or other UE is shown. FIG. 5 provides another schematic
view of selected parts of the UE. The circuitry comprising
processing circuitry 510 and memory 520 for storing data and
programs for implementing some of the processes and mechanisms
according to embodiments described herein is schematically shown.
The processing circuitry 510 may, for example, comprise one or more
of the processors of the application circuitry 402 and one or more
of the processors 404a to 404f of the baseband circuitry 404 of
FIG. 4. The memory 520 may, for example, comprise some of the
memory or storage in the application circuitry 402 and some of the
memory or storage 404g of the baseband circuitry 404. The memory
may include any combination of suitable volatile memory and/or
non-volatile memory, including, but not limited to, read-only
memory (ROM), random access memory, cache, buffers, etc. The memory
may be shared among various processors of the processing circuitry
or dedicated to particular processors. The processing circuitry 510
is coupled to, and can control, transceiver circuitry (not shown in
FIG. 5) provided by the RF circuitry 406 and FEM circuitry 408
shown in FIG. 4. The transceiver circuitry may also include parts
of the baseband circuitry and application circuitry of FIG. 4.
[0060] The memory 520 may store a plurality of applications 521.
Data may be transmitted by the applications via the baseband
circuitry 404, RF circuitry 406, FEM circuitry 408 and the antenna
410 to the eNB. Correspondingly, data for the application may be
received from the eNB 120 via the antenna 410 and passed to the
application via the FEM circuitry 408, RF circuitry 406 and
baseband circuitry 404. The memory may further store CSI-RS
configuration data 522, CRI reporting configuration data 523 and
CSI report 524, including a Rank Indicator 524a, channel quality
indicator (CQI) 524b and precoding matrix indicator (PMI) 524c. The
memory may also store CRI report 525 about the selection of the
CSI-RS resource by the UE.
[0061] The CSI-RS configuration data 522 may include a list of
parameters and other indicators signaled to the UE 120 by the eNB
110 in a DCI message. The CSI-RS configuration data 522 may cause
the UE to monitor specific CSI-RS for CRI selection and CSI
calculation. The CRI reporting configuration data 523 may also
include a list of parameters and other indicators, at least some of
which may be signaled to the UE 120 by the eNB 110 in a DCI
message. The CRI reporting configuration data 523 may interact with
one or more applications 521 or other software, firmware or
hardware of the device to cause UE to report the CRI (and also CSI)
in accordance with one or more embodiments described herein. The
CSI report 524 and CRI report may store data for sending back to
the eNB 110 in a UCI message for use by the eNB in configuring the
downlink for the UE for FD-MIMO. In some implementations, some but
not all of these values are stored in memory.
[0062] A process 900 in a UE for CRI reporting to an eNB will now
be described with respect to FIG. 9. An application 521 may
configure the UE to implement the process 800. The UE processes 901
CSI-RS signals received at an antenna of the UE from the eNB of a
serving cell of the UE based on a CSI-RS resource configuration for
the UE which may be stored at CSI-RS configuration data 522. The
CSI-RS configuration data 522 may be signaled from the eNB. In the
CSI-RS configuration, two or more NZP CSI-RS resources are
configured for the UE and each NZP CSI-RS resource is associated
with a unique CRI on a given serving cell. The UE selects 902 an
NZP CSI-RS resource for CSI calculation and reporting to the eNB
based on the processing of the received CSI-RS signals. The UE
reports 903 a CRI and a CSI of the selected NZP CSI-RS resource to
the eNB of the serving cell of the UE based on a CRI reporting
configuration of the UE signaled from the eNB which may be stored
at CRI reporting configuration data 523.
[0063] A process 1000 in an eNB for CRI reporting from a UE will
now be described with respect to FIG. 10. The eNB process 1000 may
be a counterpart to the UE process 900. The eNB configures 1001 a
CSI-RS configuration and CRI reporting parameters for the UE. In
particular, the eNB may configure for signaling to a UE CSI-RS
configuration parameters for the UE to configure the UE for
processing signals from two or more NZP CSI-RS with Nk={1,2,4,8}
antenna ports at the UE, wherein each NZP CSI-RS resource is
associated with a unique CRI on the serving cell of the eNB. In
addition, the eNB may configure for signaling to the UE CRI
reporting configuration parameters for the UE to configure the UE
for reporting the CRI in an uplink physical channel. The eNB then
processes signals, which may include UCI, received at an antenna of
the eNB in the uplink physical channel from the UE based on the CRI
reporting parameters. By this processing, a CRI report from the UE
may be recovered. The eNB identifies 1003 a CSI-RS resource
selected by the UE based on the recovered CRI report.
[0064] In this way, from the CRI and CSI reported from the UE, the
eNB may configure the downlink for the UE.
[0065] Embodiments of configurations for the CRI reporting by the
eNB and the UE and aspects of the CRI reporting by the UE to the
eNB in accordance with those embodiments will now be described for
aperiodic CRI and CSI reporting, and periodic CRI and CSI
reporting, with reference to FIGS. 6 to 8. Aperiodic CRI and CSI
reporting
[0066] In these embodiments, the UE has circuitry to configure the
CRI reporting configuration of the UE for aperiodic reporting of
the CRI and CSI on physical uplink shared channel (PUSCH) based on
CRI reporting configuration parameters signaled from the eNB. The
UE may operate in accordance with this embodiment at least in part
based on the CRI reporting configuration parameters being set to
certain value, which may be at least partly signaled by the
eNB.
[0067] In one embodiment, the UE has circuitry to encode the CRI
report jointly with a rank index (RI) report or with a channel
quality indicator (CQI) report/precoding matrix indicator (PMI)
report. UCI reporting on a physical uplink shared channel (PUSCH)
uses separate channel coding and resource element mapping for RI
and CQI/PMI reports. Support of the separate coding is required to
resolve the possible ambiguity on the CQI/PMI payload size that in
general case depends on the reported RI value. Given that the
CQI/PMI decoding is conditioned on the decoding result of the RI
report, the RI reporting is typically made more robust comparing to
the CQI/PMI. For the design of the CRI reporting procedures on
PUSCH similar issues of the UCI dependency needs to be considered.
More specifically, the number of antenna ports Nk for the K
configured NZP CSI-RS resources may be different. In this case, UE
following the existing procedures for determination of the RI
payload size based on the minimum between the number of configured
CSI-RS antenna ports and MIMO capability of the UE, may have
similar impact of the CRI report on the RI payload size (RI bit
width). For example, for a given CRI the corresponding NZP CSI-RS
resource may have the number of antenna ports different from the
number of antenna ports of another NZP CSI-RS resource
corresponding to another CRI value. As the result for class B CSI
reporting with K>1 a variable RI payload size may be observed
depending on the reported CRI value.
[0068] In view of this, in this embodiment, joint coding between
CRI and RI or between CRI and CQI/PMI may be used. The ambiguity in
the RI report payload may occur and the following options may
resolve it:
[0069] The all configured NZP CSI-RS resources are restricted in
RAN1 specification to have the same number of antenna ports
Nk.{1,2,4,8}. and/or
[0070] The RI report payload size is determined based on the
maximum number of antenna ports across all configured NZP CSI-RS
resources and MIMO capability of the UE. In this embodiment, RI
report payload size is determined based on the maximum number of
antenna ports across all configured NZP CSI-RS resources and MIMO
capability of the UE. This avoids ambiguity in the RI report
payload, at least. The unused bits in the RI report may be set to
fixed values (e.g., 0) to improve the decoding performance. In this
way, the eNB may decode the RI report more reliably leading to a
robust CRI reporting and downlink configuration system.
[0071] By using one of the alternatives above the dependency
between CRI and RI reporting can be avoided as the RI report bit
width is uniquely determined by a single value.
[0072] In another embodiment for aperiodic reporting of CRI, CRI is
independently encoded from RI and CQI/PMI. In this case the CRI
should be reported on the same SC-FDMA symbols regardless whether
the RI report is present or not, unless 1 CSI-RS antenna port is
used on all NZP CSI-RS resources. In this embodiment, the channel
coding procedure for the CRI with independent coding should follow
the channel coding procedures of the RI for different payload
sizes. To provide more robust transmission for CRI, a new parameter
ICRI (also referred to below and in FIG. 6 as IBI) may be defined.
ICRI may be used to control the amount of the coded bits for the
CRI report. The parameter ICRI may be higher layer configured or
determined from the IRI if the channel coding procedures for the
CRI and RI reports are the same. For example, a fixed relation
between IRI and ICRI offsets can be established in such way to
provide slightly more robust transmission of the CRI comparing to
the RI report, i.e. ICRI=min(12,IRI+.DELTA.), where A is some
integer value fixed in the specification (e.g., .DELTA.=1).
[0073] Based on the ICR, the UE determines the .beta.CRI (also
referred to below and in FIG. 6 as .beta.BI) offset from the table
shown in FIG. 6, which shows the mapping of RI offset values and
the index signaled by higher layers and is used to determine the
number of coded bits QCRI (also referred to as QBI) for the CRI
report.
[0074] For example, for UCI reporting on PUSCH without uplink
shared channel (UL-SCH).
Q ' = min ( O M sc PUSCH N symb PUSCH .beta. offset PUSCH O CQI -
MIN , 4 M sc PUSCH ) ##EQU00002##
[0075] where O is the number of CRI indicator bits, O.sub.CQI-MN is
the number of CQI bits including CRC bits assuming rank equals to 1
for all serving cells for which an aperiodic CSI report is
triggered, is the scheduled bandwidth for PUSCH transmission in the
current subframe expressed as a number of subcarriers in, and
N.sub.symb.sup.PUSCH is the number of SC-FDMA symbols in the
current PUSCH transmission sub-frame given by
N.sub.symb.sup.PUSCH=(2(N.sub.symb.sup.UL-1)-N.sub.SRS), where
N.sub.SRS is equal to 1 if UE is configured to send PUSCH and
sounding reference signal (SRS) in the same subframe for the
current subframe, or if the PUSCH resource allocation for the
current subframe even partially overlaps with the cell-specific SRS
subframe and bandwidth configuration, or if the current subframe is
a UE-specific type-1 SRS subframe, or if the current subframe is a
UE-specific type-0 SRS subframe and the UE is configured with
multiple TAGs. Otherwise N.sub.SRS is equal to 0. For beam
indication, the number of coded bits Q.sub.CRI for the CRI report
is given by: Q.sub.BI=Q.sub.mQ' and
[.beta..sub.offset.sup.PLUSCH=.beta..sub.offset.sup.BI/.beta..sub.offset.-
sup.CQI].
[0076] In other embodiments, different reliability of the CRI
transmission is achieved by using different resource element
mapping on PUSCH for CRI using the two alternatives, as shown in
FIG. 7:
[0077] FIG. 7, Left pane: CRI is mapped to single carrier
(SC)-frequency-division multiple access (FDMA) symbols 702 which
are closer to uplink demodulation reference signals (DM-RS) 706
than RI 708.
[0078] FIG. 7, Right pane: in another embodiment, CRI is mapped to
SC-FDMA symbols 712 which are farther to uplink DM-RS 716 than RI
718.
[0079] In the first alternative where the CRI report is mapped to
SC-FDMA symbols closer to uplink DM-RS than for RI report is
following the design principle of UCI reporting on PUSCH, when the
more important UCI information is transmitted closer to the DM-RS
to reduce the impact of the channel estimation errors. In the
second alternative, the resource element mapping for RI is the same
as in Rel-12 and CRI is transmitted on the SC-FDMA symbols not used
for any UCI transmission.
[0080] In another embodiment when NZP CSI-RS resource is configured
with one antenna port, RI is not transmitted on PUSCH. In this case
the CRI is mapped to SC-FDMA symbols of the RI report to provide
the additional robustness. This embodiment is used only if the all
NZP CSI-RS resource configured for the UE have single antenna
port.
[0081] In other embodiments, the channel coding procedure for the
CRI with independent coding should follow the channel coding
procedures of the RI for different payload sizes.
[0082] In accordance with these embodiments, robust and reliable
aperiodic reporting of CRI can be achieved.
[0083] Periodic CRI and CSI Reporting
[0084] In these embodiments, the UE has circuitry to configure the
CRI reporting configuration of the UE for periodic reporting of the
CRI and CSI on physical uplink control channel (PUCCH) based on CRI
reporting configuration parameters signaled from the eNB. The UE
may operate in accordance with this embodiment at least in part
based on the CRI reporting configuration parameters being set to
certain value, which may be at least partly signaled by the
eNB.
[0085] In an embodiment where CRI and CSI are to be reported
periodically, CRI is reported on PUCCH using a new CSI PUCCH
reporting type, type 7, containing CRI only. This type of CSI PUCCH
reporting supports CRI feedback only. The periodicity of the CRI
report MCRI and offset NOFFSET, CRI are determined by the higher
layer configured CRI-Config-Index parameter (ICRI) that indicates
the periodicity of the CRI report and subframe offset in the units
of the RI report periodicity. The table of FIG. 8 shows the Mapping
of ICRI to MCRI and NOFFSET, CRI (referred to in FIG. 8 as IBI to
MBI and NOFFSET, BI).
[0086] Similar to aperiodic CSI reporting, the payload size for RI
may be determined based on the maximum number of antenna ports
across all NZP CSI-RS resources. The payload size for RI is
selected based on the maximum number of antenna ports across NZP
CSI-RS resource. If NZP CSI-RS resource is configured with 1 CSI-RS
antenna port RI-Config-Index is configured but may not be reported
in this case. Thus, the periodicity and subframe offset for the RI
is configured regardless of the number of antenna ports in NZP
CSI-RS resource. This allows the periodicity and subframe offset
for CRI reporting to be determined even where RI may not be
reported.
[0087] The reporting periodicity of the CRI is expected to be
relatively long. Depending on the configuration of the CRI offset,
there could be long period of time when the CRI report will not be
provided to the eNB. Instead of skipping the RI and CQI/PMI
reporting in the absence of the CRI report, in another embodiment,
RI and COI/PMI information may be reported for the default NZP
CSI-RS resource, e.g., corresponding to the lowest CRI value or NZP
CSI-RS index. Thus for the calculation of CQI/PMI conditioned on
the last reported CRI, in the absence of a last reported CRI in
this embodiment the UE shall conduct the RI and CQI/PMI calculation
conditioned on the lowest possible CRI value. In another
embodiment, the highest CRI index is used.
[0088] In embodiments, transmission mode (TM) 10 is considered
configured the RI-reference CSI process to achieve CSI reporting of
the same RI across two or more CSI processes. In the case where a
RI-reference CSI process is used for class B CSI reporting with
K>1 NZP CSI-RS resources, in embodiments, for CSI process and
RI-reference CSI process all configured NZP CSI-RS resources for a
given CSI process should have the same number of NZP CSI-RS
resource antenna ports and the same set of the restricted RIs to
support CSI reporting with RI-reference CSI process.
[0089] The RI Reference process CSIs may, for example, be
associated with time periods where an interfering cell eNB, of the
one or more eNBs, is operating in a blanking mode of a CoMP
wireless network. In another embodiment, the RI Reference process
CSIs may be associated with time periods where an interfering cell
eNB, of the one or more eNBs, is operating in a non-blanking mode
of a CoMP wireless network.
[0090] It will be appreciated that the UE can be implemented in
other ways than described with respect to FIGS. 4 and 5 and may
comprise alternative or additional components. Additional
components of a UE, which can be used in the network described
herein, are shown in FIG. 11. For example, the UE may comprise one
or more user interfaces, one or more peripheral component
interfaces and one or more sensors. In various embodiments, user
interfaces could include, but are not limited to, a display 1202
(e.g., a liquid crystal display, a touch screen display, etc.), a
speaker 1204, a microphone 1206, one or more cameras 1208 (e.g., a
still camera and/or a video camera), a flashlight (e.g., a light
emitting diode flash), and a keyboard 1210, taken jointly or
severally in any and all permutations. In various embodiments, the
peripheral component interfaces may include, but are not limited
to, a non-volatile memory port, an audio jack, and a power supply
interface. In various embodiments, the sensors may include, but are
not limited to, a gyro sensor, an accelerometer, a proximity
sensor, an ambient light sensor, and a positioning unit. The
positioning unit may interact with a receiver chain of the UE to
receive signals from components of a positioning network, e.g., a
global navigation satellite system (GNSS). In various embodiments,
the UE may be a computing device such as a mobile computing device.
A mobile computer device may comprise but is not limited to, a
laptop computing device, a tablet computing device, a netbook, a
mobile phone, etc. In various embodiments, the UE may have more or
fewer components, and/or different architectures. Additionally, the
mobile device may comprise at least one or more of a memory port
1212 for receiving additional memory (not shown), a graphics
processor 1214 and an application processor 1216, taken jointly and
severally in any and all permutations. The mobile device can
comprise one, or more than one, antenna 1218. The UE is illustrated
as a mobile phone in FIG. 11 but the components described may also
be implemented, although they may have a different position with
respect to each other.
[0091] Although specific embodiments and implementations have been
illustrated and described herein, it will be appreciated by those
of ordinary skill in the art that a wide variety of alternate
and/or equivalent embodiments or implementations designed to
achieve the same purposes may be substituted for the specific
embodiments and implementations shown and described, without
departing from the scope of the present disclosure. This
application is intended to cover any adaptations or variations of
the embodiments discussed herein. Therefore, it is manifestly
intended that the embodiments of the present disclosure be limited
only by the claims and the equivalents thereof.
[0092] As used herein, the term "circuitry" may refer to, be part
of, or include an Application Specific Integrated Circuit (ASIC),
an electronic circuit, a processor (shared, dedicated, or group),
and/or memory (shared, dedicated, or group) that execute one or
more software or firmware programs, a combinational logic circuit,
and/or other suitable hardware components that provide the
described functionality. In some embodiments, the circuitry may be
implemented in, or functions associated with the circuitry may be
implemented by, one or more software or firmware modules. In some
embodiments, circuitry may include logic, at least partially
operable in hardware. Embodiments described herein may be
implemented into a system using any suitably configured hardware
and/or software.
[0093] It will be appreciated that although implementations of the
eNB, the UE, and a signaling messages control parameters and
commands have been described with respect to specific examples
shown in the drawings other implementations are contemplated. It
will be appreciated that although a base station in the network has
been described as an eNodeB or eNB, the description is relevant to
any base station that can implement the processes and methods
described. In embodiments, the implemented wireless network may be
a 3rd Generation Partnership Project's long term evolution (LTE)
advanced wireless communication standard, which may include, but is
not limited to releases 14, or later, of the 3GPP's LTE-A or
LTE-Advanced Pro standards and beyond.
[0094] While embodiments are described with reference to an LTE
network, some embodiments may be used with other types of wireless
access networks, for example another wireless access network
implementing a 3GPP wireless communication standard. The wireless
access network may implement a next generation 3GPP wireless
communication standard. In some implementations, the wireless
network may be a 3rd Generation Partnership Project's Fifth
Generation (5G) wireless network and implement a 3GPP 5G wireless
communication standard.
[0095] Although the examples and embodiments have been described
separately with respect to their accompanying drawings, embodiments
are not limited thereto. Embodiments can be realized in which the
embodiments or examples associated with the figures can be taken
jointly and severally in any and all permutations. For example, the
features of FIG. 1, and/or the features of the description of FIG.
1, can be taken together with the features of FIG. 2 or the
description of FIGS. 2 and so on.
[0096] Where variations of examples or embodiments have been
presented as being at least a member of an enumerated list, either
with or without the accompanying language "taken jointly or
severally in any and all permutations", it is clear that all
permutations of such enumerated list members are contemplated,
which is made more emphatic by the accompanying language "taken
jointly and severally in any and all permutations" or, where
appropriate, "taken jointly and severally in any and all
combinations".
[0097] Embodiments are also provided according to the following
numbered clauses:
[0098] Example 1 may include a method of beam index reporting from
a user equipment (UE), the method comprising:
[0099] configuring two or more non zero power (NZP) channel station
information reference signals (CSI-RS) with Nk={1,2,4,8} antenna
ports at the UE, wherein each NZP CSI-RS resource is associated
with an unique NZP CSI-RS index on a given serving cell;
[0100] configuring parameters associated with a beam index (BI) or
NZP CSI-RS resource index reporting from the UE;
[0101] selecting of the NZP CSI-RS resource for channel state
information (CSI) calculation and reporting from the UE;
[0102] reporting beam index indicating the selected NZP CSI-RS
resource and associated CSI information to the serving cell.
[0103] Example 2 may include the method of example 1 or some other
example herein, wherein CSI corresponds to aperiodic CSI reporting
on physical uplink shared channel (PUSCH)
[0104] Example 3 may include the method of example 2 or some other
example herein, further comprising: performing joint coding between
BI and RI or between BI and CQI/PMI.
[0105] Example 4 may include the method of example 3 or some other
example herein, further comprising: determining an RI report
payload size based on a maximum number of antenna ports across K
configured NZP CSI-RS resources and a MIMO capability of the
UE.
[0106] Example 5 may include the method of example 4 or some other
example herein, wherein the unused bits in the RI report are set to
fixed values (e.g., 0 or 1).
[0107] Example 6 may include the method of example 3 or some other
example herein, wherein all configured NZP CSI-RS resources have a
same number of antenna ports Nk {1,2,4,8}.
[0108] Example 7 may include the method of example 2 or some other
example herein, wherein the BI is independently encoded from RI
and/or COI/PMI.
[0109] Example 8 may include the method of example 7 or some other
example herein, wherein BI is reported on one or more same SC-FDMA
symbols regardless whether the RI report is present or not.
[0110] Example 9 may include the method of example 7 or some other
example herein, wherein BI is reported on SC-FDMA symbols of the RI
report if all NZP CSI-RS resources have 1 CSI-RS antenna port.
[0111] Example 10 may include the method of example 7 or some other
example herein, wherein a channel coding procedure for the BI is a
same channel coding procedure as a channel coding procedures of the
RI for different payload sizes.
[0112] Example 11 may include the method of example 7 or some other
example herein, wherein a new parameter IBI is used to control the
amount of the coded bits OBI for the BI report.
[0113] Example 12 may include the method of example 11 or some
other example herein, the parameter IBI is higher layer
configured.
[0114] Example 13 may include the method of example 11 or some
other example herein, is determined from the IRI.
[0115] Example 14 may include the method of example 13 or some
other example herein, a fixed relation between IRI and IBI offsets
can be established using IBI=min(12,IRI+.alpha.), where .alpha. is
some integer value fixed in the specification (e.g. .alpha.=1).
[0116] Example 15 may include the method of example 1 or some other
example herein, wherein CSI corresponds to periodic CSI reporting
on physical uplink control channel (PUCCH)
[0117] Example 16 may include the method of example 15 or some
other example herein, wherein the payload size for RI is determined
based on the maximum number of antenna ports across all NZP CSI-RS
resources and MIMO UE capability.
[0118] Example 17 may include the method of example 15 or some
other example herein, wherein RI-Config-Index is configured
regardless of the number of antenna ports on NZP CSI-RS
resources.
[0119] Example 18 may include the method of example 17 or some
other example herein, wherein RI is not reported if the number of
antenna ports on NZP CSI-RS is 1.
[0120] Example 19 may include the method of example 15 or some
other example herein, wherein the calculation of RI and CQI/PMI
conditioned on the last reported BI, in the absence of a last
reported BI the UE conducts the RI and CQI/PMI calculation
conditioned on the lowest possible BI or NZP CSI-RS value
configured for a given CSI process.
[0121] Example 20 may include the method of example 15 or some
other example herein, wherein the calculation of RI and CQI/PMI
conditioned on the last reported BI, in the absence of a last
reported BI the UE conducts the RI and CQI/PMI calculation
conditioned on the highest possible BI or NZP CSI-RS value
configured for a given CSI process.
[0122] Example 21 may include the method of example 15 or some
other example herein, wherein for CSI process and RI-reference CSI
process, all configured NZP CSI-RS resources f should have the same
number of NZP CSI-RS resource antenna ports and the same set of
restricted RIs.
[0123] Example 22 may include an apparatus comprising means to
perform one or more elements of a method described in or related to
any of examples 1-21, or any other method or process described
herein.
[0124] Example 23 may include one or more non-transitory
computer-readable media comprising instructions to cause an
electronic device, upon execution of the instructions by one or
more processors of the electronic device, to perform one or more
elements of a method described in or related to any of examples
1-21, or any other method or process described herein.
[0125] Example 24 may include an apparatus comprising logic,
modules, and/or circuitry to perform one or more elements of a
method described in or related to any of examples 1-21, or any
other method or process described herein.
[0126] Example 25 may include a method, technique, or process as
described in or related to any of examples 1-21, or portions or
parts thereof.
[0127] Example 26 may include an apparatus comprising: one or more
processors and one or more computer readable media comprising
instructions that, when executed by the one or more processors,
cause the one or more processors to perform the method, techniques,
or process as described in or related to any of examples 1-21, or
portions thereof.
[0128] Example 27 may include a method of communicating in a
wireless network as shown and described herein.
[0129] Example 28 may include a system for providing wireless
communication as shown and described herein.
[0130] Example 29 may include a device for providing wireless
communication as shown and described herein.
[0131] Further embodiments are also provided according to the
following numbered clauses:
[0132] Clause 1. An apparatus for supporting a user equipment (UE)
in reporting of a selection of a Non-Zero Power (NZP) Channel State
Information Reference Signal (CSI-RS) resource to an eNodeB (eNB)
supporting Full Dimension Multiple Input Multiple Output (FD-MIMO)
communication, the apparatus comprising circuitry to: process
CSI-RS signals received at an antenna of the UE from the eNB of a
serving cell of the UE based on a CSI-RS resource configuration for
the UE signaled from the eNB in which two or more NZP CSI-RS
resources are configured for the UE and in which each NZP CSI-RS
resource is associated with a unique NZP CSI-RS Resource Indication
(CRI) on a given serving cell; select an NZP CSI-RS resource for
channel state information (CSI) calculation and reporting to the
eNB based on the processing of the received CSI-RS signals; and
[0133] report a CRI and a CSI of the selected NZP CSI-RS resource
to the eNB of the serving cell of the UE based on a CRI reporting
configuration of the UE signaled from the eNB.
[0134] Clause 2. The apparatus of clause 1, comprising circuitry to
configure the CSI-RS resource configuration of the UE for
processing signals from two or more NZP CSI-RS with Nk={1,2,4,8}
antenna ports at the UE, based on CSI-RS configuration parameters
signaled from the eNB of the serving cell of the UE. Clause 3. The
apparatus of clause 1 or 2, comprising circuitry to configure the
CRI reporting configuration of the UE for aperiodic reporting of
the CRI and CSI on physical uplink shared channel (PUSCH) based on
CRI reporting configuration parameters signaled from the eNB.
[0135] Clause 4. The apparatus of clause 3, comprising circuitry to
configure the UE to encode the CRI report jointly with a rank index
(RI) report or with a channel quality indicator (CQI)
report/precoding matrix indicator (PMI) report.
[0136] Clause 5. The apparatus of clause 4, comprising circuitry to
configure the UE to set a payload size of a rank index (RI) report
based on a maximum number of antenna ports (Nk) across K configured
NZP CSI-RS resources and a MIMO capability of the UE.
[0137] Clause 6. The apparatus of clause 5, comprising circuitry to
configure the UE to set unused bits in an RI report to fixed
values.
[0138] Clause 7. The apparatus of clause 3, comprising circuitry to
configure the UE to encode the CRI report independently of a rank
index (RI) report and/or a channel quality indicator (CQI)
report/precoding matrix indicator (PMI) report.
[0139] Clause 8. The apparatus of clause 7, comprising circuitry to
configure the UE to report the CRI on one or more same SC-FDMA
symbols regardless of whether or not the RI report is present.
[0140] Clause 9. The apparatus of clause 7, comprising circuitry to
configure the UE to report the CRI on SC-FDMA symbols of the RI
report if all NZP CSI-RS resources configured for the UE have a
single CSI-RS antenna port.
[0141] Clause 10. The apparatus of clause 7, comprising circuitry
to configure the UE to perform a same channel coding procedure for
the CRI as a channel coding procedure of the RI for different
payload sizes.
[0142] Clause 11. The apparatus of any preceding clause, comprising
circuitry to configure the CRI reporting configuration of the UE
for periodic reporting of the CRI and CSI on physical uplink
control channel (PUCCH) based on CRI reporting configuration
parameters signaled from the eNB.
[0143] Clause 12. The apparatus of clause 11, comprising circuitry
to configure the CRI reporting configuration of the UE to set a CRI
reporting periodicity and subframe offset based on an RI report
configuration and periodicity and CRI reporting configuration
parameters signaled from the eNB.
[0144] Clause 13. The apparatus of clause 11 or 12, comprising
circuitry to configure the UE to set a payload size of a rank index
(RI) report based on a maximum number of antenna ports (Nk) across
K configured NZP CSI-RS resources and a MIMO capability of the
UE.
[0145] Clause 14. The apparatus of clause 11, 12 or 13, comprising
circuitry to configure the RI-Config-Index of the UE regardless of
the number of antenna ports on the configured NZP CSI-RS
resources.
[0146] Clause 15. The apparatus of clause 14, comprising circuitry
to cause the UE to not report the RI if the number of antenna ports
on NZP CSI-RS is 1.
[0147] Clause 16. The apparatus of any of clauses 11 to 15,
comprising circuitry to cause the UE to perform RI and CQI/PMI
calculation conditioned on the last reported CRI, and, in the
absence of a last reported BI to cause the UE to perform the RI and
CQI/PMI calculation conditioned on the lowest possible CRI value
configured for a given CSI process.
[0148] Clause 17. The apparatus of any of clauses 11 to 16,
comprising circuitry to cause the UE, for a CSI process and an
RI-reference CSI process, to check that the NZP CSI-RS resource
configuration for all configured NZP CSI-RS resources of the CSI
process and the RI-reference CSI process have the same number Nk of
NZP CSI-RS resource antenna ports and the same set of restricted
RIs, said NZP CSI-RS resource configuration being based on CSI-RS
configuration parameters signaled from the eNB of the serving cell
of the UE.
[0149] Clause 18. An apparatus for supporting a user equipment (UE)
in reporting of a selection of a Non-Zero Power (NZP) Channel State
Information Reference Signal (CSI-RS) resource to an eNodeB (eNB)
supporting Full Dimension Multiple Input Multiple Output (FD-MIMO)
communication, the apparatus comprising circuitry to: [0150] select
an NZP CSI-RS resource for channel state information (CSI)
calculation and reporting to the eNB based on processed CSI-RS
signals received at an antenna of the UE from the eNB of a serving
cell of the UE based on a CSI-RS resource configuration for the UE
signaled from the eNB in which two or more NZP CSI-RS resources are
configured for the UE and in which each NZP CSI-RS resource is
associated with a unique NZP CSI-RS Resource Indication (CRI) on a
given serving cell; [0151] configure the UE to set a payload size
of a rank index (RI) report based on a maximum number of antenna
ports (Nk) across K configured NZP CSI-RS resources and a MIMO
capability of the UE; and [0152] report a CRI and a CSI of the
selected NZP CSI-RS resource to the eNB of the serving cell of the
UE based on a CRI reporting configuration of the UE signaled from
the eNB.
[0153] Clause 19. A user equipment (UE) comprising apparatus as
clauseed in any of clauses 1 to 18.
[0154] Clause 20. Apparatus for supporting an eNodeB (eNB)
supporting Full Dimension Multiple Input Multiple Output (FD-MIMO)
communication and reporting to the eNB by a UE of a selection by
the UE of a Non-Zero Power (NZP) Channel State Information
Reference Signal (CSI-RS) beam transmitted by the eNB, the eNB
comprising circuitry to: [0155] generating UE CSI-RS configuration
parameters for signaling to the UE for processing signals from two
or more NZP CSI-RS with Nk ={1,2,4,8} antenna ports at the UE,
wherein each NZP CSI-RS resource is associated with a unique NZP
CSI-RS Resource Indication (CRI) on the serving cell of the eNB;
[0156] configure for signaling to the UE CRI reporting
configuration parameters for the UE to configure the UE for
reporting the CRI in an uplink physical channel; [0157] process
signals received at an antenna of the eNB in the uplink physical
channel from the UE based on the CRI reporting parameters to
recover a CRI report; and [0158] identify a CSI-RS resource
selected by the UE based on the recovered CRI report.
[0159] Clause 21. The apparatus of clause 20, comprising circuitry
to decode a CRI report and a CSI report based on a payload size of
a rank index (RI) report being set based on a maximum number of
antenna ports (Nk) across K configured NZP CSI-RS resources and a
reported MIMO capability of the UE.
[0160] Clause 22. The apparatus of clause 21, further comprising
circuitry to configure the CRI reporting configuration parameter
for the UE for aperiodic reporting of the CRI on physical uplink
shared channel (PUSCH), and to decode a CRI report joint coded with
the RI report or a channel quality indicator (CQI) report/precoding
matrix indicator (PMI) report based on the payload size set for the
RI report.
[0161] Clause 23. The apparatus of clause 22, further comprising
circuitry to decode the CRI report joint coded with the RI report
or a channel quality indicator (CQI) report/precoding matrix
indicator (PMI) report based on unused bits in an RI report being
set to fixed values.
[0162] Clause 24. The apparatus of any of clauses 20 to 23, further
comprising circuitry to configure the CRI reporting configuration
parameter for the UE for periodic reporting of the CRI on physical
uplink control channel (PUCCH), and to configure the eNB to signal
to the UE to configure the RI-Config-Index of the UE regardless of
the number of antenna ports on the configured NZP CSI-RS
resources.
[0163] Clause 25. An eNB comprising apparatus as clauseed in any of
clauses 20 to 24.
[0164] Clause 26. A method for supporting a user equipment (UE) in
reporting of a selection of a Non-Zero Power (NZP) Channel State
Information Reference Signal (CSI-RS) resource to an eNodeB (eNB)
supporting Full Dimension Multiple Input
[0165] Multiple Output (FD-MIMO) communication, the method
comprising: [0166] processing CSI-RS signals received at an antenna
of the UE from the eNB of a serving cell of the UE based on a
CSI-RS resource configuration for the UE signaled from the eNB in
which two or more NZP CSI-RS resources are configured for the UE
and in which each NZP CSI-RS resource is associated with a unique
NZP CSI-RS Resource Indication (CRI) on a given serving cell;
[0167] selecting an NZP CSI-RS resource for channel state
information (CSI) calculation and reporting to the eNB based on the
processing of the received CSI-RS signals; and [0168] reporting a
CRI and a CSI of the selected NZP CSI-RS resource to the eNB of the
serving cell of the UE based on a CRI reporting configuration of
the UE signaled from the eNB.
[0169] Clause 27. The method of clause 26, further comprising
configuring the CSI-RS resource configuration of the UE for
processing signals from two or more NZP CSI-RS with Nk ={1,2,4,8}
antenna ports at the UE, based on CSI-RS configuration parameters
signaled from the eNB of the serving cell of the UE.
[0170] Clause 28. The method of clause 26 or 27, further comprising
aperiodically reporting the CRI and CSI on physical uplink shared
channel (PUSCH) based on CRI reporting configuration parameters
signaled from the eNB.
[0171] Clause 29. The method of clause 28, further comprising
encoding the CRI report jointly with a rank index (RI) report or
with a channel quality indicator (CQI) report/precoding matrix
indicator (PMI) report.
[0172] Clause 30. The method of clause 29, further comprising
setting a payload size of a rank index (RI) report based on a
maximum number of antenna ports (Nk) across K configured NZP CSI-RS
resources and a MIMO capability of the UE.
[0173] Clause 31. The method of clause 30, further comprising
setting unused bits in an RI report to fixed values.
[0174] Clause 32. The method of clause 28, further comprising
encoding the CRI report independently of a rank index (RI) report
and/or a channel quality indicator (CQI) report/precoding matrix
indicator (PMI) report.
[0175] Clause 33. The method of clause 32, further comprising
reporting the CRI on one or more same SC-FDMA symbols regardless of
whether or not the RI report is present.
[0176] Clause 34. The method of clause 32, further comprising
reporting the CRI on SC-FDMA symbols of the RI report if all NZP
CSI-RS resources configured for the UE have a single CSI-RS antenna
port.
[0177] Clause 35. The method of clause 32, further comprising
performing a same channel coding procedure for the CRI as a channel
coding procedure of the RI for different payload sizes.
[0178] Clause 36. The method of any of clauses 26 to 25, further
comprising periodically reporting the CRI and CSI on physical
uplink control channel (PUCCH) based on CRI reporting configuration
parameters signaled from the eNB.
[0179] Clause 37. The method of clause 36, further comprising
setting a CRI reporting periodicity and subframe offset based on an
RI report configuration and periodicity and CRI reporting
configuration parameters signaled from the eNB. Clause 38. The
method of clause 36 or 37, further comprising setting a payload
size of a rank index (RI) report based on a maximum number of
antenna ports (Nk) across K configured NZP CSI-RS resources and a
MIMO capability of the UE.
[0180] Clause 39. The method of clause 36, 37 or 38, further
comprising configuring the RI-Config-Index of the UE regardless of
the number of antenna ports on the configured NZP CSI-RS
resources.
[0181] Clause 40. The method of clause 39, further comprising not
reporting the RI if the number of antenna ports on NZP CSI-RS is
1.
[0182] Clause 41. The method of any of clauses 36 to 40, further
comprising performing RI and CQI/PMI calculation conditioned on the
last reported CRI, and, in the absence of a last reported BI,
performing the RI and CQI/PMI calculation conditioned on the lowest
possible CRI value configured for a given CSI process.
[0183] Clause 42. The method of any of clauses 36 to 41, further
comprising, for a CSI process and an RI-reference CSI process,
checking that the NZP CSI-RS resource configuration for all
configured NZP CSI-RS resources of the CSI process and the
RI-reference CSI process have the same number Nk of NZP CSI-RS
resource antenna ports and the same set of restricted RIs, said NZP
CSI-RS resource configuration being based on CSI-RS configuration
parameters signaled from the eNB of the serving cell of the UE.
[0184] Clause 43. A method for supporting a user equipment (UE) in
reporting of a selection of a Non-Zero Power (NZP) Channel State
Information Reference Signal (CSI-RS) resource to an eNodeB (eNB)
supporting Full Dimension Multiple Input Multiple Output (FD-MIMO)
communication, the method comprising: [0185] selecting an NZP
CSI-RS resource for channel state information (CSI) calculation and
reporting to the eNB based on processed CSI-RS signals received at
an antenna of the UE from the eNB of a serving cell of the UE based
on a CSI-RS resource configuration for the UE signaled from the eNB
in which two or more NZP CSI-RS resources are configured for the UE
and in which each NZP CSI-RS resource is associated with a unique
NZP CSI-RS Resource Indication (CRI) on a given serving cell;
[0186] setting a payload size of a rank index (RI) report based on
a maximum number of antenna ports (Nk) across K configured NZP
CSI-RS resources and a MIMO capability of the UE; and [0187]
reporting a CRI and a CSI of the selected NZP CSI-RS resource to
the eNB of the serving cell of the UE based on a CRI reporting
configuration of the UE signaled from the eNB.
[0188] Clause 44. A method for supporting an eNodeB (eNB)
supporting Full Dimension Multiple Input Multiple Output (FD-MIMO)
communication and reporting to the eNB by a UE of a selection by
the UE of a Non-Zero Power (NZP) Channel State Information
Reference Signal (CSI-RS) beam transmitted by the eNB, the method
comprising: [0189] generating UE CSI-RS configuration parameters
for signaling to the UE for processing signals from two or more NZP
CSI-RS with Nk={1,2,4,8} antenna ports at the UE, wherein each NZP
CSI-RS resource is associated with a unique NZP CSI-RS Resource
Indication (CRI) on the serving cell of the eNB; [0190] configuring
for signaling to the UE CRI reporting configuration parameters for
the UE to configure the UE for reporting the CRI in an uplink
physical channel; [0191] processing signals received at an antenna
of the eNB in the uplink physical channel from the UE based on the
CRI reporting parameters to recover a CRI report; and [0192]
identifying a CSI-RS resource selected by the UE based on the
recovered CRI report.
[0193] Clause 45. The method of clause 44, further comprising
decoding a CRI report and a CSI report based on a payload size of a
rank index (RI) report being set based on a maximum number of
antenna ports (Nk) across K configured NZP CSI-RS resources and a
reported MIMO capability of the UE.
[0194] Clause 46. The method of clause 45, further comprising
configuring the CRI reporting configuration parameter for the UE
for aperiodic reporting of the CRI on physical uplink shared
channel (PUSCH), and decoding a CRI report joint coded with the RI
report or a channel quality indicator (CQI) report/precoding matrix
indicator (PMI) report based on the payload size set for the RI
report.
[0195] Clause 47. The method of clause 46, further comprising
decoding the CRI report joint coded with the RI report or a channel
quality indicator (CQI) report/precoding matrix indicator (PMI)
report based on unused bits in an RI report being set to fixed
values.
[0196] Clause 48. The method of any of clauses 44 to 47, further
comprising configuring the CRI reporting configuration parameter
for the UE for periodic reporting of the CRI on physical uplink
control channel (PUCCH), and configuring the eNB to signal to the
UE to configure the RI-Config-Index of the UE regardless of the
number of antenna ports on the configured NZP CSI-RS resources.
[0197] Clause 49. An apparatus comprising means for implementing a
method of any of clauses 26 to 49.
[0198] Clause 50. Machine executable instructions arranged, when
executed by at least one processor or circuitry, for implementing a
method of any of clauses 26 to 48.
[0199] Clause 51. Machine readable storage storing machine
executable instructions of clause 50.
[0200] Clause 52. An eNB, UE, device, apparatus or system as
described or claimed herein, and/or as expressed in any and all
example clauses, further comprising at least one of: [0201] a
display, such as, for example, a touch sensitive display, an input
device, such as, for example, one or more than one of a button, a
key pad, an audio input, a video input, and/or [0202] an output
device such as, for example, an audio output, a video output, a
haptic device taken jointly and severally in any and all
permutations.
[0203] Clause 53. An apparatus, UE, method, eNodeB substantially as
described herein with reference to and/or as illustrated in any one
or more of the accompanying drawings.
[0204] The foregoing description of one or more implementations
provides illustration and description, but is not intended to be
exhaustive or to limit the scope of the example embodiments to the
precise form disclosed. Modifications and variations are possible
in light of the above teachings or may be acquired from practice of
various implementations of the example embodiments.
[0205] As used in this specification, the formulation "at least one
of A, B or C", and the formulation "at least one of A, B and C" use
a disjunctive "or" and a disjunctive "and" such that those
formulations comprise any and all joint and several permutations of
A, B, C, that is, A alone, B alone, C alone, A and B in any order,
A and C in any order, B and C in any order and A, B, C in any
order.
[0206] It will be understood that the terms "receiving" and
"transmitting" encompass "inputting" and "outputting" and are not
limited to an RF context of transmitting and receiving radio waves.
Therefore, for example, a chip or other device or component for
realizing embodiments could generate data for output to another
chip, device or component, or have as an input data from another
chip, device or component, and such an output or input could be
referred to as "transmit" and "receive" including gerund forms,
that is, "transmitting" and "receiving", as well as such
"transmitting" and "receiving" within an RF context.
* * * * *