WO2024031580A1 - Procédés, dispositifs et support lisible par ordinateur pour des communications - Google Patents

Procédés, dispositifs et support lisible par ordinateur pour des communications Download PDF

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Publication number
WO2024031580A1
WO2024031580A1 PCT/CN2022/111924 CN2022111924W WO2024031580A1 WO 2024031580 A1 WO2024031580 A1 WO 2024031580A1 CN 2022111924 W CN2022111924 W CN 2022111924W WO 2024031580 A1 WO2024031580 A1 WO 2024031580A1
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WIPO (PCT)
Prior art keywords
srs
reference signals
csi
value
network device
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PCT/CN2022/111924
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English (en)
Inventor
Yukai GAO
Peng Guan
Gang Wang
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Nec Corporation
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Publication date
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Priority to PCT/CN2022/111924 priority Critical patent/WO2024031580A1/fr
Publication of WO2024031580A1 publication Critical patent/WO2024031580A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices, and computer readable medium for communication.
  • MIMO multi input multi output
  • a plurality of antennas at a transmitter and/or receiver can be used to achieve array and diversity gain instead of capacity gain.
  • a same symbol weighted by a complex-valued scale factor is sent from each transmit antenna so that the input covariance matrix has unit rank.
  • This scheme is referred to as beamforming.
  • precoding is used for multi-layer beamforming in order to maximize the throughput of a multi-antenna system.
  • Precoding is a generalized beamforming scheme to support multi-layer transmission in a MIMO system. Using precoding, multiple streams are transmitted from the transmit antennas with independent and appropriate weighting per antenna such that the throughput is maximized at the receiver output.
  • example embodiments of the present disclosure provide a solution for communication.
  • a method for communication comprises receiving, at a terminal device and from a network device, at least one configuration for a first plurality of reference signals; and transmitting, to the network device, at least one codebook indicator based on a second plurality of reference signals, wherein the second plurality of reference signals is selected from the first plurality of reference signals; or transmitting, to the network device, at least one sounding reference signal (SRS) based on the second plurality of reference signals, wherein the second plurality of reference signals is indicated with a first indication field.
  • SRS sounding reference signal
  • a method for communication comprises transmitting, at a network device, to a terminal device, at least one configuration for a first plurality of reference signals; and receiving, from the terminal device, at least one codebook indicator based on a second plurality of reference signals, wherein the second plurality of reference signals is selected from the first plurality of reference signals; or receiving, from the terminal device, at least one sounding reference signal (SRS) based on the second plurality of reference signals, wherein the second plurality of reference signals is indicated with a first indication field.
  • SRS sounding reference signal
  • a terminal device comprising a processing unit; and a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the terminal device to perform acts comprising: receiving at least one configuration for a first plurality of reference signals; and transmitting at least one codebook indicator based on a second plurality of reference signals, wherein the second plurality of reference signals is selected from the first plurality of reference signals; or transmitting at least one sounding reference signal (SRS) based on the second plurality of reference signals, wherein the second plurality of reference signals is indicated with a first indication field.
  • SRS sounding reference signal
  • a source network device comprises a processing unit; and a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the source network device to perform acts comprising: transmitting at least one configuration for a first plurality of reference signals; and receiving at least one codebook indicator based on a second plurality of reference signals, wherein the second plurality of reference signals is selected from the first plurality of reference signals; or receiving at least one sounding reference signal (SRS) based on the second plurality of reference signals, wherein the second plurality of reference signals is indicated with a first indication field.
  • SRS sounding reference signal
  • a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any one of the first aspect, second or third aspect.
  • Fig. 1 is a schematic diagram of a communication environment in which embodiments of the present disclosure can be implemented
  • Fig. 2 illustrates a signaling flow for handover according to some embodiments of the present disclosure
  • Fig. 3 is a flowchart of an example method in accordance with an embodiment of the present disclosure.
  • Fig. 4 is a flowchart of an example method in accordance with an embodiment of the present disclosure.
  • Fig. 5 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • the term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a NodeB in new radio access (gNB) a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, a satellite network device, an aircraft network device, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB NodeB in new radio access
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a femto node, a pico node, a satellite network
  • terminal device refers to any device having wireless or wired communication capabilities.
  • Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • the terminal device may be connected with a first network device and a second network device.
  • One of the first network device and the second network device may be a master node and the other one may be a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device is eNB and the second RAT device is gNB.
  • Information related with different RATs may be transmitted to the terminal device from at least one of the first network device and the second network device.
  • a first information may be transmitted to the terminal device from the first network device and a second information may be transmitted to the terminal device from the second network device directly or via the first network device.
  • information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device.
  • Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
  • Communications discussed herein may use conform to any suitable standards including, but not limited to, New Radio Access (NR) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , cdma2000, and Global System for Mobile Communications (GSM) and the like.
  • NR New Radio Access
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.85G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , and the sixth (6G) communication protocols.
  • the techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies.
  • circuitry used herein may refer to hardware circuits and/or combinations of hardware circuits and software.
  • the circuitry may be a combination of analog and/or digital hardware circuits with software/firmware.
  • the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions.
  • the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software/firmware for operation, but the software may not be present when it is not needed for operation.
  • the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and/or firmware.
  • values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • transmission occasions In the following, the terms “transmission occasions” , “repetitions” , “transmission” , “SRS transmission occasions” , “SRS repetitions” , “repeated transmissions” , “communication” and “transmissions” can be used interchangeably.
  • precoding matrix Precoding
  • precoding Precoding
  • beam beamforming
  • precoder size
  • size and “number of PRBs” may be used interchangeably.
  • vector vector
  • first vector “first beam” , “first bases” , “spatial domain basis vectors” , “spatial domain vectors” , “spatial domain basis” , “spatial domain bases” , “SD basis” , “SD bases” , “first basis” , “spatial domain/SD basis vectors corresponding to a TRP index” , “spatial domain/SD vectors corresponding to a TRP index” , “spatial domain/SD basis corresponding to a TRP index” , “spatial domain/SD bases corresponding to a TRP index” “first basis corresponding to a TRP index” can be used interchangeably.
  • a TRP In the context of the present application, the terms “a TRP” , “a TRP group” , “a CSI-RS resource” and “a group of CSI-RS ports” can be used interchangeably.
  • a TRP index a TRP group index
  • a CSI-RS resource index a group of CSI-RS ports index
  • index can be used interchangeably.
  • indicator indicates whether or not to be used interchangeably.
  • field e.g., “bit field”
  • bitmap e.g., “bitmap”
  • physical resource block e.g., “resource block” , “PRB” and “RB”
  • bit size e.g., “bit size of bits” , “number of bits” , “size of field” and “field size” can be used interchangeably.
  • single TRP single TCI state
  • S-TCI single TCI
  • S-TCI single CORESET
  • S-TCI state single control resource set pool
  • multiple TRPs multiple TCI states
  • multiple CORESETs multiple control resource set pools
  • multi-TRP multiple TCI state
  • multi-TCI multiple TCI
  • multi-CORESET multi-control resource set pool
  • MTRP multiple TRP and M-TCI
  • M-TPR multi-control resource set pool
  • precoding is a generalized beamforming scheme to support multi-layer transmission in a MIMO system.
  • Precoding is a technique that exploits transmit diversity by weighting the information stream, i.e. the transmitter sends the coded information to the receiver to achieve pre-knowledge of the channel.
  • multiple streams are transmitted from the transmit antennas with independent and appropriate weighting per antenna such that the throughput is maximized at the receiver output.
  • precoding matrix and “precoder” may be used interchangeably hereinafter.
  • uplink transmission with 8 antenna ports can support more than 4 layers.
  • the CSI feedback is important in the wireless communication network.
  • 3GPP 3rd-generation partnership project
  • some discussions for CSI enhancement are expected to be discussed, for example. It is expected that CSI enhancement for a high/medium velocity and for coherent joint transmission (CJT) will be specified and the maximum number of CSI-RS ports per resource will remain the same as release 17. For example, 32 ports per CSI-RS resource.
  • TD time-domain
  • DD correlation/doppler-domain
  • UE reporting of TD channel properties measured via CSI-reference signal (RS) for tracking.
  • RS CSI-reference signal
  • SRS sounding reference signal
  • TDD time division duplex
  • a CSI report may be divided into two parts, i.e., part 1 and part 2, where part 2 may be further divided into three groups, i.e., group 0 to group 2.
  • a CSI report may comprise PMI fields X 1 and PMI fields X 2 .
  • PMI fields X 1 may be comprised in CSI group 0.
  • PMI fields X 2 may be comprised in CSI group 1 and CSI group 2.
  • a subset of PMI fields X 2 may be comprised in CSI group 1, and the remaining of PMI fields X 2 may be comprised in CSI group 2.
  • Table 1 illustrates an example mapping order of CSI fields of one CSI report, CSI part 1.
  • Table 1 an example mapping order of CSI fields of one CSI report, CSI part 1
  • the values of the rank indicator (RI) field are mapped to allowed rank indicator values with increasing order, where '0' is mapped to the smallest allowed rank indicator value.
  • a parameter of number of allowed rank indicator values (e.g. n RI ) may be configured by the network device.
  • v may be the number of layers or the value of rank indicator field.
  • the number of layers or the value of the RI field may be reported by the terminal device to the network device.
  • Table 3 illustrates an example RI and CQI
  • the values of the rank indicator (RI) field are mapped to allowed rank indicator values with increasing order, where '0' is mapped to the smallest allowed rank indicator value.
  • the terminal device may receive, from the network device, at least one configuration, wherein the at least one configuration may include at least one of:
  • ⁇ a first number of CSI-RS resources in the first plurality of CSI-RS resources (e.g. represented as T 1 ) ,
  • ⁇ a size of one time unit (e.g. represented as T u or T i ) ,
  • each group of first vectors may include the second plurality of first vectors.
  • each group of first vectors may correspond to one TRP (or one CSI-RS resource) ,
  • each group of second vectors may include the second plurality of second vectors.
  • each group of second vectors may correspond to one TRP (or one CSI-RS resource)
  • ⁇ a sixth parameter for codebook (e.g. represented as ⁇ d ) and
  • ⁇ a seventh parameter for codebook (e.g. represented as M) .
  • the terminal device may be configured with a number of PRBs for a bandwidth part (BWP) or with a size for the BWP.
  • BWP bandwidth part
  • the number of PRBs for the BWP (e.g. represented as ) may be a positive integer.
  • N BWP may be a positive integer.
  • the terminal device may be configured with a starting position of the BWP (e.g. represented as ) .
  • a starting position of the BWP e.g. represented as
  • the starting position of the BWP and the number of PRBs for the BWP may be configured in one higher layer parameter.
  • first subband may correspond to a subband for CQI or CQI subband or CSI subband.
  • the size of one first subband or the number of PRBs of one first subband may be represented as and is a positive integer. For example, may be at least one of ⁇ 4, 8, 16, 32 ⁇ . In some embodiments, may be based on the value of N BWP . In some embodiments, if 24 ⁇ N BWP ⁇ 72, may be 4 or 8. For example, may be configured to be 4 or 8 based on one higher layer parameter for subband. In some embodiments, if 73 ⁇ N BWP ⁇ 144, may be 8 or 16. For example, may be configured to be 8 or 16 based on the higher layer parameter for subband. In some embodiments, if 145 ⁇ N BWP ⁇ 275, may be 16 or 32. For example, may be configured to be 16 or 32 based on the higher layer parameter for subband.
  • the at least one parameter for antenna port may comprise at least one of: a first plurality of antenna port groups, the number of the first plurality of antenna port groups, the number of antenna ports in one antenna port group, one or more subsets of antenna ports in one antenna port group, the number of the one or more subsets of antenna ports in one antenna port group, the number of antenna ports in one subset of antenna ports, a plurality of antenna ports in one subset of antenna ports, a plurality of antenna ports in one antenna port group, a first parameter of antenna port configuration and a second parameter of antenna port configuration.
  • one antenna port group may correspond to a TRP or antenna ports of a TRP.
  • the at least one configuration may comprise the first plurality of antenna port groups.
  • the at least one parameter for antenna port may comprise a plurality of antenna ports for one CSI-RS resource of the first plurality of CSI-RS resources.
  • one CSI-RS resource may correspond to a TRP.
  • one antenna port group may correspond to one CSI-RS resource. In some embodiments, one antenna port group may correspond to one TRP or one panel or one TRP group. In some embodiments, one CSI-RS resource of the first plurality of CSI-RS resources may correspond to one TRP or one panel or one TRP group.
  • the terms “antenna port group” , “TRP” , “panel” , “TRP group” and “CSI-RS resource” can be used interchangeably.
  • the number of the first plurality of antenna port groups or the number of the first plurality of CSI-RS resources may be one of ⁇ 1, 2, 3, 4 ⁇ or ⁇ 1, 2, 4 ⁇ or ⁇ 2, 3, 4 ⁇ or ⁇ 2, 4 ⁇ .
  • the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources (e.g. represented as T s . ) may be one of ⁇ 1, 2, 3, 4 ⁇ or ⁇ 1, 2, 4 ⁇ or ⁇ 2, 3, 4 ⁇ or ⁇ 2, 4 ⁇ .
  • the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources T s may be 1 ⁇ T s ⁇ T 1 .
  • T s may be 1 or 2.
  • T s may be 1 or 2 or 4.
  • T s may be 1 or 2 or 3 or 4.
  • the at least one configuration may comprise the plurality of antenna ports in one antenna port group or in one CSI-RS resource.
  • the number of the plurality of antenna ports in one antenna port group or in one CSI-RS resource (e.g. represented as P) may be one of ⁇ 1, 2, 4, 6, 8, 12, 16, 32 ⁇ .
  • number of antenna ports in each antenna port group or in each one CSI-RS resource of the first plurality of CSI-RS resources may be same.
  • P may be a positive integer.
  • P may be one of ⁇ 1, 2, 4, 6, 8, 12, 16, 32 ⁇ .
  • the terminal device may receive from the network device, at least one configuration for a first plurality of reference signals. In some embodiments, the terminal device may transmit, to the network device, at least one codebook indicator based on a second plurality of reference signals. In some embodiments, the second plurality of reference signals may be determined or selected from the first plurality of reference signals. In some embodiments, the second plurality of reference signals may be a subset or all of the first plurality of reference signals. In some embodiments, the terminal device may transmit, to the network device, at least one sounding reference signal (SRS) based on the second plurality of reference signals. In some embodiments, the second plurality of reference signals may be indicated with a first indication field.
  • SRS sounding reference signal
  • the first indication field may indicate at least one of: at least one reference signal selected from the first plurality of reference signals; a number of the second plurality of reference signals; indexes of the second plurality of reference signals; index of a first reference signal from the first plurality of reference signal; codebook type for the at least one codebook indicator; a transmission scheme; a number of the at least one SRS; and a number of ports for each one of the at least one SRS.
  • the at least one codebook indicator may be conditioned on the first indication field.
  • a number of groups for a first vector may be based on the number of the second plurality of reference signals, wherein each group may comprise a plurality of first vectors.
  • a number of groups for a second vector may be based on the number of the second plurality of reference signals, wherein each group comprises a plurality of second vectors.
  • a number of groups for rotation factor may be based on the number of the second plurality of reference signals.
  • a number of amplitude coefficients may be based on the number of the second plurality of reference signals.
  • a number of phase coefficients may be based on the number of the second plurality of reference signals.
  • a field size for an indication of bitmap for amplitude coefficients and/or phase coefficients may be based on the number of the second plurality of reference signals.
  • the terminal device may receive, from the network device, at least one configuration for the at least one SRS, wherein the at least one configuration for the at least one SRS comprises at least one of: a plurality of sets of power control parameters and a plurality of pathloss reference signals.
  • precoder (s) applied for the transmission of the at least one SRS may be calculated based on the second plurality of reference signals.
  • a first set of power control parameters for the transmission of the at least one SRS from the plurality of sets of power control parameters may be determined based on the first indication field or the first CSI-RS resource.
  • a first pathloss reference signal from the plurality of pathloss reference signals may be determined based on the first indication field or the first CSI-RS resource.
  • a power for the transmission of the at least one SRS may be based on the first set of power control parameters and/or the first pathloss reference signal.
  • the terminal device may transmit, to the network device, the first indication field for the second plurality of reference signals.
  • the terminal device may receive, from the network device, the first indication field for the second plurality of reference signals.
  • a reference signal may be a CSI-RS.
  • the first reference signal may be at least one of: a reference signal corresponding to a largest power; a reference signal corresponding to a largest amplitude coefficient; and a reference signal with a lowest index value among the first plurality of reference signals.
  • the terminal device may receive, from the network device, a configuration for a first cyclic shift for the at least one SRS. In some embodiments, the terminal device may determine a second cyclic shift based on the first cyclic shift and a cyclic shift hopping for the at least one SRS. In some embodiments, the terminal device may determine a frequency resource mapping for the at least one SRS based on the second cyclic shift. In some embodiments, the terminal device may transmit, to the network device, the at least one SRS based on the frequency resource mapping.
  • the network device may transmit, to a terminal device, at least one configuration for a first plurality of reference signals.
  • the network device may receive, from the terminal device, at least one codebook indicator based on a second plurality of reference signals, wherein the second plurality of reference signals may be selected from the first plurality of reference signals.
  • the network device may receive, from the terminal device, at least one sounding reference signal (SRS) based on the second plurality of reference signals, wherein the second plurality of reference signals may be indicated with a first indication field or the first CSI-RS resource.
  • SRS sounding reference signal
  • the network device may transmit, to the terminal device, at least one configuration for the at least one SRS, wherein the at least one configuration for the at least one SRS comprises at least one of: a plurality of sets of power control parameters; a plurality of pathloss reference signals.
  • the network device may transmit, to the terminal device, a configuration for a first cyclic shift for the at least one SRS. In some embodiments, the network device may determine, a second cyclic shift based on the first cyclic shift and a cyclic shift hopping for the at least one SRS. In some embodiments, the network device may determine, a frequency resource mapping for the at least one SRS based on the second cyclic shift. In some embodiments, the network device may receive, from the terminal device, the at least one SRS based on the frequency resource mapping.
  • the number of antenna ports for one of the one or more reference signals (e.g. represented as P tot ) may be a positive integer.
  • P tot may be a positive integer.
  • P tot may be one of ⁇ 2, 4, 8, 12, 16, 24, 32 ⁇ .
  • P tot P*T 1 .
  • the reference signal may be at least one of: a channel state information reference signal (CSI-RS) , a sounding reference signal (SRS) , a demodulation reference signal (DMRS) , a CSI-RS for tracking and a phase tracking reference signal (PTRS) .
  • CSI-RS channel state information reference signal
  • SRS sounding reference signal
  • DMRS demodulation reference signal
  • PTRS phase tracking reference signal
  • the terminal device may receive the reference signal based on the number of antenna ports for the reference signal.
  • the first indication field may indicate whether doppler domain basis is reported or indicate a doppler domain basis type.
  • the bit size may be 1 bit.
  • an index of one antenna port group or an index of a CSI-RS resource of the first plurality of CSI-RS resources may be represented as t, t may be a non-negative integer. For example, 1 ⁇ t ⁇ T 1 . For another example, 0 ⁇ t ⁇ T 1 -1. For another example, 0 ⁇ t ⁇ T s -1. For another example, 1 ⁇ t ⁇ T s .
  • the antenna port group or the CSI-RS resource with index t may comprise P t antenna ports.
  • P t may be a positive integer.
  • P t may be one of ⁇ 1, 2, 4, 6, 8, 12, 16, 32 ⁇ .
  • the antenna port group with index t may comprise N g,t subsets of antenna ports.
  • N g, t may be a positive integer.
  • N g, t may be one of ⁇ 1, 2, 3, 4 ⁇ .
  • each subset of antenna ports may correspond to a panel or antenna ports of a panel.
  • the values of N g, t may be different.
  • the values of N g, t may be same.
  • each subset of antenna ports may comprise P t antenna ports.
  • a value of the first parameter of antenna port configuration may be represented as N 1 .
  • N 1 may be a positive integer.
  • N 1 may be one of ⁇ 2, 3, 4, 6, 8, 12, 16 ⁇ .
  • a value of the second parameter of antenna port configuration may be represented as N 2 .
  • N 2 may be a positive integer.
  • N 2 may be one of ⁇ 1, 2, 3, 4 ⁇ .
  • the first parameter of antenna port configuration and the second parameter of antenna port configuration may be configured in one higher layer parameter.
  • the number of antenna ports in one antenna port group or in one CSI-RS resource may be determined based on the first parameter of antenna port configuration and a second parameter of antenna port configuration.
  • a parameter “O 1 ” there may be a parameter “O 1 ” , and “O 1 ” may represent a first discrete fourier transform (DFT) oversampling in the first dimension.
  • DFT discrete fourier transform
  • “O 1 ” may be one of ⁇ 1, 2, 4 ⁇ .
  • “O 1 ” may be 2 or 4.
  • there may be a parameter “O 2 ” and “O 2 ” may represent a second DFT oversampling in the second dimension.
  • “O 2 ” may be one of ⁇ 1, 2, 4 ⁇ .
  • “O 2 ” may be 2 or 4.
  • one configuration of (N 1 , N 2 ) may correspond to one configuration of (O 1 , O 2 ) . In some embodiments, one configuration of (O 1 , O 2 ) may correspond to one configuration of (N 1 , N 2 ) .
  • the example configurations of (N 1 , N 2 ) and (O 1 , O 2 ) and/or P may be at least one of row and/or column in the following Table 4.
  • N/A may represent no value or no configuration of a parameter.
  • one configuration of (N g,t , N 1 , N 2 ) may correspond to one configuration of (O 1 , O 2 ) . In some embodiments, one configuration of (O 1 , O 2 ) may correspond to one configuration of (N g,t , N 1 , N 2 ) .
  • the configurations of (N g,t , N 1 , N 2 ) and (O 1 , O 2 ) and/or P tot or P t or P may be at least one of row and/or column in the following Table 5.
  • P tot or P t or P (N g,t , N 1 , N 2 ) (O 1 , O 2 ) 8 (2, 2, 1) (4, 1) 16 (2, 4, 1) (4, 1) 16 (4, 2, 1) (4, 1) 16 (2, 2, 2) (4, 4) 32 (2, 8, 1) (4, 1) 32 (4, 4, 1) (4, 1) 32 (2, 4, 2) (4, 4) 32 (4, 2, 2) (4, 4)
  • the configurations of T 1 and/or (N 1 , N 2 ) and/or (O 1 , O 2 ) and/or P tot and/or P t or P may be at least one of row and/or column in the following Table 6.
  • the configurations of T 1 and/or (N 1 , N 2 ) and/or (O 1 , O 2 ) and/or P tot and/or P t or P may be at least one of row and/or column in the following Table 7.
  • P tot N 1 ⁇ N 2 ⁇ 2.
  • the configurations of T 1 and/or (N g,t , N 1 , N 2 ) and/or (O 1 , O 2 ) and/or P tot and/or P t or P may be at least one of row and/or column in the following Table 9.
  • u m there may be a vector u m .
  • u m may be a DFT vector.
  • m may be a non-negative integer. For example, 0 ⁇ m ⁇ O 2 N 2 .
  • m may be one of ⁇ 0, 2, 4, 6, 8 ⁇ .
  • m may be one of ⁇ 0, 1, 2, 3 ⁇ .
  • m may be 0 or 1.
  • m may be 0.
  • l may be a non-negative integer. For example, 0 ⁇ l ⁇ O 1 N 1 .
  • l may be one of ⁇ 0, 2, 4, 6, 8 ⁇ .
  • l may be one of ⁇ 0, 1, 2, 3 ⁇ .
  • l may be 0 or 1.
  • [ ] T may represent a transposition of a vector or a matrix.
  • v l, m may be a first vector.
  • the terminal device may determine or report a number of layers and at least one codebook indicator based on the at least one configuration to the network device.
  • the number of layers (e.g. represented as v ri ) may be one of ⁇ 1, 2 ⁇ or ⁇ 1, 2, 3, 4 ⁇ or ⁇ 1, 2, 3, 4, 5, 6, 7, 8 ⁇ .
  • r may be one of ⁇ 1, 2, ...v ri ⁇ or ⁇ 1, 2 ⁇ or ⁇ 1, 2, 3, 4 ⁇ or ⁇ 1, 2, 3, 4, 5, 6, 7, 8 ⁇ .
  • the at least one codebook indicator may comprise at least one of: one or more indicators (or a field) for a first plurality of antenna port groups, one or more indicators (or a field) for a second plurality of antenna port groups, one or more indicators (or a field) for a first plurality of first vectors, one or more indicators (or one or more fields) for a first plurality of second vectors, one or more indicators (or a field) for a first plurality of rotations for the first plurality of first vectors, one or more indication fields for the groups of first vectors, one or more indication fields for the groups of second vectors, an indication field for the plurality of third vectors, one or more indicators (or a field) for a second plurality of first vectors corresponding to one TRP index (or a CSI-RS resource index or an index of a group of CSI-RS ports or a CSI-RS allocation index) , one or more indicators (or a field) for the second plurality of first vectors, one or
  • the one or more indicators (or one or more bitmaps) for indicating nonzero coefficients may indicate indexes of third amplitude coefficients and/or indicating indexes of third phase coefficients, and values of the third amplitude coefficients corresponding to the indexes and/or the third phase coefficients corresponding to the indexes may be nonzero.
  • the one or more indicators (or one or more bitmaps) for indicating nonzero coefficients may indicate which coefficients in the one or more indications or in the field for the plurality of third amplitude coefficients are nonzero or reported.
  • the one or more indicators (or one or more bitmaps) for indicating nonzero coefficients may indicate which coefficients in the one or more indications or in the field for the plurality of third phase coefficients are nonzero or reported.
  • one or more of the at least one codebook indicator may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, one or more of the at least one codebook indicator may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the second plurality of antenna port groups may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the second plurality of antenna port groups may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the first or second plurality of first vectors may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the first or second plurality of first vectors may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the first or second plurality of second vectors may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the first or second plurality of second vectors may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the first plurality of rotations for the first or second plurality of first vectors may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the first plurality of rotations for the first or second plurality of first vectors may correspond to one layer with an index, for example, layer specific.
  • the indicator (or the field) for the strongest coefficient may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the indicator (or the field) for the strongest coefficient may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the plurality of first amplitude coefficients may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the plurality of first amplitude coefficients may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the plurality of first phase coefficients may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the plurality of first phase coefficients may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the plurality of second amplitude coefficients may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the plurality of second amplitude coefficients may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the plurality of second phase coefficients may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for the plurality of second phase coefficients may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for the plurality of third amplitude coefficients may correspond to one layer with an index, for example, layer specific. In some embodiments, the one or more indicators (or the field) for the plurality of third phase coefficients may correspond to one layer with an index, for example, layer specific.
  • the one or more indicators (or the field) for indicating nonzero coefficients may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the one or more indicators (or the field) for indicating nonzero coefficients may correspond to one layer with an index, for example, layer specific.
  • the first number of nonzero coefficients may be same or applied for each layer of the number of layers, for example, layer common. In some embodiments, the first number of nonzero coefficients may correspond to one layer with an index, for example, layer specific.
  • the number of the first or second plurality of first vectors, the number of the first or second plurality of second vectors, the number of the plurality of third vectors, the second parameter for codebook and the third parameter for codebook may be configured or indicated in one higher layer parameter.
  • the fifth parameter for codebook and the sixth parameter for codebook may be configured or indicated in one higher layer parameter.
  • the second parameter for codebook may be one of ⁇ 1/2, 1/4, 1/8 ⁇ .
  • the third parameter for codebook may be one of ⁇ 1/4, 1/2, 3/4 ⁇ .
  • the number of the second plurality of first vectors (e.g. represented as L) may be one of ⁇ 2, 4, 6 ⁇ or at least one of ⁇ 2, 4, 6, 8, 12, 16, 24, 32 ⁇ .
  • L may be a positive integer.
  • L may be one of ⁇ 2, 4, 6 ⁇ or one of ⁇ 2, 4, 6, 8, 12, 16, 24, 32 ⁇ .
  • the number of the second plurality of first vectors corresponding to one TRP index e.g.
  • L t may be one of ⁇ 2, 4, 6 ⁇ or at least one of ⁇ 2, 4, 6, 8 ⁇ .
  • L t may be a positive integer.
  • L t may be one of ⁇ 2, 4, 6 ⁇ .
  • the third parameter for codebook may further be based on number of layers.
  • the number of the first plurality of first vectors may be based on the number of the second plurality of first vectors and either one of the number of the first plurality of CSI-RS resources or the number of the second plurality of CSI-RS resources.
  • the first parameter for codebook (for example, represented as R) may be a positive integer.
  • R may be a positive integer.
  • R may be one of ⁇ 1, 2 ⁇ .
  • a number of precoding matrices may be determined based on the first parameter for codebook, the number of the plurality of first subbands.
  • the first parameter for codebook may control the total number of precoding matrices indicated by the PMI as a function of the number of configured first subbands or the number of the plurality of first subbands, the size of one first subband and of the number of PRBs for the BWP.
  • second subband may correspond to a subband for precoding matrix indicator (PMI) or PMI subband.
  • PMI precoding matrix indicator
  • the size of one second subband or the number of PRBs of one second subband may be represented as N PMI , and N PMI is a positive integer.
  • N PMI may be one of ⁇ 2, 4, 8, 16, 32 ⁇ .
  • N PMI may be based on and R. For example,
  • the number of the plurality of second subbands N 3 or the size or the length of one second vector may be a positive integer. For example, 9 ⁇ N 3 ⁇ 36. For example, for another example, For another example, For another example, For another example, For another example, For another example, For another example, For another example, For another example, For another example, For another example, For another example,
  • the first precoding matrix corresponds to the first PRBs of the one of the plurality of first subbands
  • the second precoding matrix corresponds to the last PRBs of the one of the plurality of first subbands.
  • the first precoding matrix may correspond to the first PRBs of the first/beginning one of the plurality of first subbands and the second precoding matrix corresponds to the last PRBs of the first/beginning one of the plurality of first subbands.
  • the first precoding matrix may correspond to the first PRBs of the last/ending one of the plurality of first subbands and the second precoding matrix may correspond to the last PRBs of the last/ending one of the plurality of first subbands.
  • the number of the second plurality of second vectors M v may be a positive integer.
  • M v may be one of ⁇ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ⁇ .
  • the number of the first plurality of second vectors may be based on the number of the second plurality of second vectors and either one of the number of the first plurality of CSI-RS resources or the number of the second plurality of CSI-RS resources.
  • the value of the first parameter R may be one of ⁇ 2, 4 ⁇ or ⁇ 2, 3 ⁇ or ⁇ 1, 3 ⁇ or ⁇ 1, 4 ⁇ or ⁇ 1, 2, 3, 4 ⁇ or ⁇ 3, 4 ⁇ .
  • the value of the first parameter R may be one of ⁇ 2, 4 ⁇ or ⁇ 3, 4 ⁇ .
  • a plurality of precoding matrices may be determined from L+M v vectors or L_t+M v vectors or L_t+M v_t vectors.
  • the bit size of the one or more indicators (or the field) for the second plurality of CSI-RS resources or second plurality of antenna port groups may be ceil (log2 (nchoosek (T 1 , T s ) ) ) . In some embodiments, the bit size of the one or more indicators (or the field) for the second plurality of CSI-RS resources or second plurality of antenna port groups may be ceil (log2 (T 1 ! / (T 1 -T s ) ! ) ) .
  • nchoosek may be a function to choose k values from n values.
  • nchoosek (a, b) a! / (b! * (a-b) ! ) .
  • “! ” may be factorial.
  • a! 1*2*...* (a-1) *a.
  • Fig. 1 illustrates an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the network 100 includes a network device 110.
  • the network device 110 may be configured with one or two or three or four TRPs/panels 120-1 and/or 120-2 and/or 120-3 and/or 120-4 (collectively referred to as TRPs 120 or individually referred to as TRP 120) .
  • the network 100 also includes a terminal device 130 served by the network device 110.
  • the serving area of the network device 110 is called as a cell 101 and/or a cell 102.
  • the network 100 may include any suitable number of devices adapted for implementing embodiments of the present disclosure.
  • one or more terminal devices may be located in the cell 101 and/or cell 102 and served by the network device 110.
  • carrier aggregation can be supported in the network 100, in which two or more CCs are aggregated in order to support a broader bandwidth.
  • the network device 110 may provide to the terminal device 130 a plurality of serving cells including one primary cell (Pcell or Pscell or Spcell) 101 corresponding to a primary CC and at least one secondary cell (Scell) 102 corresponding to at least one secondary CC.
  • Pcell or Pscell or Spcell primary cell
  • Scell secondary cell
  • the network 100 may include any suitable number of network devices, terminal devices and/or serving cells adapted for implementing implementations of the present disclosure.
  • the terminal device 130 may establish connections with two different network devices (not shown in FIG. 1) and thus can utilize radio resources of the two network devices.
  • the two network devices may be respectively defined as a master network device and a secondary network device.
  • the master network device may provide a group of serving cells, which are also referred to as “Master Cell Group (MCG) ” .
  • the secondary network device may also provide a group of serving cells, which are also referred to as “Secondary Cell Group (SCG) ” .
  • SCG Secondary Cell Group
  • a term “Special Cell (Spcell) ” may refer to the Pcell of the MCG or the primary Scell (Pscell) of the SCG depending on if the terminal device 130 is associated to the MCG or the SCG, respectively.
  • the term “SpCell” may also refer to the PCell.
  • the terminal device 130 may be connected with a first network device and a second network device (not shown in FIG. 1) .
  • One of the first network device and the second network device may be in a master node and the other one may be in a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device may be an eNB and the second RAT device is a gNB.
  • Information related to different RATs may be transmitted to the terminal device 130 from at least one of the first network device and the second network device.
  • first information may be transmitted to the terminal device 130 from the first network device and second information may be transmitted to the terminal device 130 from the second network device directly or via the first network device.
  • information related to configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device.
  • Information related to reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
  • the information may be transmitted via any of the following: Radio Resource Control (RRC) signaling, Medium Access Control (MAC) control element (CE) or Downlink Control Information (DCI) .
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • CE Control element
  • DCI Downlink Control Information
  • terminal device refers to any device having wireless or wired communication capabilities.
  • Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, Ultra-Reliable Low latency Communication (URLLC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • PDAs personal digital assistants
  • IoT internet of things
  • IoE Internet of Everything
  • MTC machine type communication
  • URLLC Ultra-Reliable Low latency Communication
  • X means pedestrian, vehicle, or infrastructure/network
  • image capture devices such as digital cameras
  • gaming devices music storage and play
  • the term ‘network device’ or ‘base station’ (BS) refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a Transmission Reception Point (TRP) , a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB next generation NodeB
  • TRP Transmission Reception Point
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a fem
  • TRP refers to an antenna array (with one or more antenna elements) available to the network device located at a specific geographical location.
  • a network device may be coupled with multiple TRPs in different geographical locations to achieve better coverage.
  • the TRP can also be referred to as a “panel” , which also refers to an antenna array (with one or more antenna elements) or a group of antennas.
  • the terminal device 130 may be connected with a first network device and a second network device (not shown in FIG. 1) .
  • One of the first network device and the second network device may be in a master node and the other one may be in a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device may be an eNB and the second RAT device is a gNB.
  • Information related to different RATs may be transmitted to the terminal device 130 from at least one of the first network device and the second network device.
  • first information may be transmitted to the terminal device 130 from the first network device and second information may be transmitted to the terminal device 130 from the second network device directly or via the first network device.
  • information related to configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device.
  • Information related to reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
  • the information may be transmitted via any of the following: Radio Resource Control (RRC) signaling, Medium Access Control (MAC) control element (CE) or Downlink Control Information (DCI) .
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • CE Control element
  • DCI Downlink Control Information
  • the network device 110 may communicate with the terminal device 130 via a first TRP (for example, TRP 120-1) and/or a second TRP (for example, TRP 120-2) and/or a third TRP (for example, TRP 120-3) and/or a fourth TRP (for example, TRP 120-4) .
  • a first TRP for example, TRP 120-1
  • a second TRP for example, TRP 120-2
  • a third TRP for example, TRP 120-3
  • a fourth TRP for example, TRP 120-4
  • the first TRP and/or the second TRP and/or the third TRP and/or the fourth TRP may be included in a same serving cell or different serving cells provided by the network device 110.
  • the network device 110 can communicate data and control information to the terminal device 130 and the terminal device 130 can also communication data and control information to the network device 110.
  • a link from the network device 110 to the terminal device 130 is referred to as a downlink (DL)
  • a link from the terminal device 130 to the network device 110 is referred to as an uplink (UL) .
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM) and the like.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • the first TRP and/or the second TRP and/or the third TRP and/or the fourth TRP may be explicitly associated with different higher-layer configured identities.
  • a higher-layer configured identity can be associated with a Control Resource Set (CORESET) , a reference signal (RS) , or a Transmission Configuration Indication (TCI) state, which is used to differentiate between transmissions between different TRPs 120 and the terminal device 130.
  • CORESET Control Resource Set
  • RS reference signal
  • TCI Transmission Configuration Indication
  • slot refers to a dynamic scheduling unit.
  • One slot comprises a predetermined number of symbols.
  • the number of symbols in one slot may be 12 or 14.
  • the term “sub-slot” may refer to a number of symbols.
  • the number of symbols in one sub-slot may be 1, 2, 4, 7, 14.
  • the sub-slot may comprise fewer symbols than one slot.
  • the slot used herein may refer to a normal slot which comprises a predetermined number of symbols and also refer to a sub-slot which comprises fewer symbols than the predetermined number of symbols.
  • Fig. 2 shows a signaling chart illustrating process 200 among devices according to some example embodiments of the present disclosure. Only for the purpose of discussion, the process 200 will be described with reference to Fig. 1.
  • the process 200 may involve the terminal device 130 and the network device 110 shown in Fig. 1.
  • the network device 110 may transmit 2010 at least one configuration to the terminal device 130.
  • the at least one configuration may indicate the first plurality of CSI-RS resources or the first plurality of antenna port groups of a CSI-RS resource.
  • the terminal device 130 may transmit 2020 at least one codebook indicator or SRS to the network device 110.
  • the at least one codebook indicator or the SRS transmission may be determined based on the at least one configuration.
  • the at least one codebook indicator or the SRS transmission may be determined based on the second plurality of CSI-RS resources or the second plurality of antenna port groups.
  • the second plurality of CSI-RS resources may be determined or selected from the first plurality of CSI-RS resources.
  • the second plurality of antenna port groups may be determined or selected from the first plurality of antenna port groups.
  • Fig. 3 shows a flowchart of an example method 300 in accordance with an embodiment of the present disclosure.
  • the method 300 can be implemented at any suitable devices. Only for the purpose of illustrations, the method 300 can be implemented at a terminal device 130 as shown in Fig. 1.
  • the terminal device 130 receives at least one configuration for codebook from the network device 110.
  • the terminal device 130 transmits at least one codebook indicator or SRS, wherein the at least one codebook indicator or the transmission of the SRS may be determined based on the second plurality of CSI-RS resources or antenna port groups.
  • Fig. 4 shows a flowchart of an example method 400 in accordance with an embodiment of the present disclosure.
  • the method 400 can be implemented at any suitable devices. Only for the purpose of illustrations, the method 400 can be implemented at a network device 110 as shown in Fig. 1.
  • the network device 110 transmits at least one configuration for codebook to the terminal device 130.
  • the network device 110 receives at least one codebook indicator or SRS from the terminal device 130.
  • the terminal device may receive at least one configuration for codebook, wherein the at least one configuration for codebook may comprise: a first plurality of antenna port groups and a plurality of antenna ports in one antenna port group. In some embodiments, the terminal device may receive at least one configuration for codebook, wherein the at least one configuration for codebook may comprise: a first plurality of CSI-RS resources. In some embodiments, the terminal device may transmit, to the network device, a number of layers and at least one codebook indicator based on the at least one configuration for codebook. In some embodiments, the terminal device may transmit, to the network device, a number of layers and at least one codebook indicator based on the second plurality of CSI-RS resources or the second plurality of antenna port groups.
  • the at least one codebook indicator may comprise at least one of: one or more indicators for a first plurality of first vectors, one or more indicators for the second plurality of first vectors, one or more indicators for a first plurality of second vectors, one or more indicators for the second plurality of second vectors and one or more indicators for a plurality of third vectors.
  • At least one of: the number of the first plurality of first vectors, the number of the first plurality of second vectors, the number of groups for the first vectors, the number of groups for the second vectors, a size of the one or more indicators of the first plurality of first vectors and a size of the one or more indicators of the first plurality of second vectors may be based on a number of the second plurality of antenna port groups or a number of the second plurality of CSI-RS resources.
  • the second plurality of antenna port groups may be same as the first plurality of antenna port groups or a subset of antenna port groups selected from the first plurality of antenna port groups.
  • the second plurality of CSI-RS resources may be same as the first plurality of CSI-RS resources or a subset of CSI-RS resources selected from the first plurality of CSI-RS resources.
  • the at least one codebook indicator may comprise: a field for a plurality of third amplitude coefficients corresponding to one layer with an index, a field for a plurality of third phase coefficients corresponding to one layer with the index, and at least one of: a bitmap for indicating nonzero coefficients corresponding to one layer with the index and an indicator of strongest coefficient corresponding to one layer with the index.
  • the bitmap for indicating nonzero coefficients may indicate which coefficients in the field for the plurality of third amplitude coefficients are nonzero or reported.
  • the bitmap for indicating nonzero coefficients may indicate which coefficients in the field for the plurality of third phase coefficients are nonzero or reported.
  • a size of the bitmap for indicating nonzero coefficients may be based on the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources.
  • a size of the indicator of the strongest coefficient may be based on the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources.
  • the at least one codebook indicator may comprise a field for a first plurality of second vectors corresponding to one layer with the index, and a number of the first plurality of second vectors may be based on the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources.
  • the length of one second vector may be determined based on a first parameter for codebook and a number of first subbands.
  • a value of the first parameter for codebook may be determined based on the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources.
  • the number of the plurality of second vectors may be determined based on a third parameter for codebook, a number of second subbands and the first parameter for codebook. In some embodiments, the number of second subbands may be based on the first parameter for codebook and the number of first subbands. In some embodiments, a second size of one second subband may be determined based on the first parameter for codebook and a first size of one first subband.
  • the value of the first parameter for codebook may be a first value.
  • the value of the first parameter for codebook may be a second value. In some embodiments, the second value may be larger than or no less than the first value.
  • the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources may be 1, the number of the second plurality of first vectors or second vectors may be a third value. In some embodiments, if the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources is larger than 1, the number of the second plurality of first vectors or second vectors may be a fourth value. In some embodiments, the fourth value may be no less than or larger than the third value.
  • the number of the second plurality of first vectors may be determined as a minimum value between the fourth value and a fifth value.
  • a number of the plurality of antenna ports in one antenna port group may be the first parameter of antenna port configuration multiples the second parameter of antenna port configuration multiplies 2.
  • the length of one first vector may be based on the number of the plurality of antenna ports in one antenna port group or in one CSI-RS resource and divided by 2 or based on the fifth value.
  • the number of the first plurality of antenna port groups or the number of the first plurality of CSI-RS resources may be at least one of 2, 3, 4.
  • the number of the second plurality of antenna port groups or the number of the second plurality of CSI-RS resources may be no larger than the number of the first plurality of antenna port groups or the number of the first plurality of CSI-RS resources and no less than 1.
  • the terminal device may receive a reference signal, wherein a number of antenna ports for the reference signal may be the number of the first plurality of antenna port groups multiplies the number of the plurality of antenna ports in one antenna port group.
  • at least one codebook indicator may be determined or measured based on the reference signal.
  • the terminal device may receive the first plurality of reference signals.
  • at least one codebook indicator may be determined or measured based on the first plurality of reference signals or based on the second plurality of reference signals selected from the first plurality of reference signals.
  • the number of one or more indicators (or the field) for the plurality of first amplitude coefficients may be K b1 * (T-1) or K b1 * (T 1 -1) or K b1 * (T s -1) or
  • K b1 may be the bit size for each of the first amplitude coefficients.
  • K b1 may be 2 or 3 or 4 bits.
  • the number of one or more indicators (or the field) for the plurality of first amplitude coefficients may be based on the number of the plurality of fourth vectors and either one of: the number of the first plurality of antenna port groups; or the number of the second plurality of antenna port groups.
  • the number of one or more indicators (or the field) for the plurality of first amplitude coefficients may be K b1 * (T-1) *M w or K b1 * (T 1 -1) *M w or K b1 * (T s -1) *M w or
  • the one or more indicators (or the field) for the plurality of first amplitude coefficients may be comprised in the PMI or in the first part of the PMI or in the second part of the PMI.
  • the number of one or more indicators (or the field) for the plurality of first phase coefficients may be based on the number of the first plurality of antenna port groups or the number of the second plurality of antenna port groups. In some embodiments, the number of one or more indicators (or the field) for the plurality of first phase coefficients may be based on the number of the first plurality of antenna port groups minus 1 or the number of the second plurality of antenna port groups minus 1.
  • the number of one or more indicators (or the field) for the plurality of first phase coefficients may be K b2 * (T-1) or K b2 * (T 1 -1) or K b2 * (T s -1) or
  • K b2 may be the bit size for each of the first phase coefficients.
  • K b2 may be 2 or 3 or 4 bits.
  • the number of one or more indicators (or the field) for the plurality of first phase coefficients may be based on the number of the plurality of fourth vectors and either one of: the number of the first plurality of antenna port groups; or the number of the second plurality of antenna port groups.
  • the number of one or more indicators (or the field) for the plurality of first phase coefficients may be K b2 * (T-1) *M w or K b2 * (T 1 -1) *M w or K b2 * (T s -1) *M w or
  • the one or more indicators (or the field) for the plurality of first phase coefficients may be comprised in the PMI or in the first part of the PMI or in the second part of the PMI.
  • the indicator of the first amplitude coefficient for the first antenna port group may be fixed.
  • the indicator of the first amplitude coefficient for the first antenna port group may be fixed as 0 or 7 or 15 or 3.
  • the value of the first amplitude coefficient for the first antenna port group may be fixed.
  • the value of the first amplitude coefficient for the first antenna port group may be fixed as 1.
  • the indicator of the first phase coefficient for the first antenna port group may be fixed.
  • the indicator of the first phase coefficient for the first antenna port group may be fixed as 0 or 7 or 15 or 3.
  • the value of the first phase coefficient for the first antenna port group may be fixed.
  • the value of the first phase coefficient for the first antenna port group may be fixed as 1 or e j2 ⁇ *0 .
  • the number of one or more indicators (or the field) for the plurality of second amplitude coefficients may be based on at least one of: the number of the second plurality of antenna port groups and the value of the first amplitude coefficient for an antenna port group.
  • the one or more indicators (or the field) for the plurality of second amplitude coefficients may be comprised in the PMI or in the first part of the PMI or in the second part of the PMI.
  • values of one second amplitude coefficient may be larger than 0 or not 0.
  • the one or more indicators (or one or more bitmaps) for indicating nonzero coefficients may indicate indexes of third amplitude coefficients and/or indexes of third phase coefficients.
  • each bit or codepoint of the indicator (or bitmap) may indicate whether the third amplitude coefficient and/or the third phase coefficient corresponding to a layer with an index, corresponding to a first vector (or a first beam) with an index and corresponding to a second vector with an index is reported or not (or the value is 0 or not) .
  • a value of each bit is either 0 or 1.
  • 0 may indicate the third amplitude coefficient and/or the third phase coefficient corresponding to the layer with an index, corresponding to a first vector (or a first beam) with the index and corresponding to the second vector with an index is not reported (or the value is 0) .
  • 1 may indicate the third amplitude coefficient and/or the third phase coefficient corresponding to the layer with an index, corresponding to a first vector (or a first beam) with the index and corresponding to the second vector with an index is reported (or the value is not 0) .
  • the number of the one or more indicators (or one or more bitmaps) for indicating nonzero coefficients may be same as the number of layers.
  • each one indicator (or one bitmap) for indicating nonzero coefficients may correspond to one layer with an index.
  • the number of one or more indicators (or the field) for the plurality of first phase coefficients may be K b2 * (T-1) *M w or K b2 * (T 1 -1) *M w or K b2 * (T s -1) *M w or
  • one first vector may be represented as v i ,
  • size of W 1 may be (2*N 1 *N 2 *T) * (2*L t ) or (2*N 1 *N 2 *T s ) * (2*L t ) .
  • a size of each element in W 1 may be (N 1 *N 2 *T) *L t
  • “0” in W 1 may be a zero matrix with size (N 1 *N 2 *T) *L t .
  • W 1 W 01 *W 02 .
  • the size of W 01 may be (2*N 1 *N 2 ) * (2*L t ) .
  • s may be 0 and/or 1.
  • s may be for two polarizations.
  • s may be for different groups of vectors.
  • the size of W f may be M v *N 3 .
  • ⁇ z, r may be a variant for power calculation or power normalization.
  • ⁇ z, r may be based on the plurality of third amplitude coefficients, the plurality of third phase coefficients and at least one of: the plurality of first amplitude coefficients, the plurality of second amplitude coefficients, the plurality of first phase coefficients and the plurality of second phase coefficients. In some embodiments, ⁇ z, r may be based on the number of the plurality of third vectors and at least one of: the number of the plurality of first vectors, the number of the plurality of second vectors and the number of the plurality of fourth vectors.
  • the third amplitude coefficient and/or the third phase coefficient corresponding to the bits or codepoints or values may be set to 0.
  • the number of the plurality of first vectors may be based on the number of the plurality of second vectors and at least one of: the number of the first plurality of antenna port groups; the number of the second plurality of antenna port groups; and values of the plurality of first amplitude coefficients.
  • the size of W f may be M v *M 3 .
  • a value of one first amplitude coefficient may be one of In some embodiments, the bit size for one first amplitude coefficient may be 4 bits. In some embodiments, a value of an indicator or a field for one first amplitude coefficient may be one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ⁇ .
  • an indicator or a field for one first amplitude coefficient with value 0 may correspond to the first amplitude coefficient with value 0.
  • an indicator or a field for one first amplitude coefficient with value 1 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 2 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 3 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 4 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 5 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 6 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 7 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 8 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 9 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 10 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 11 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 12 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 13 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 14 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 15 may correspond to the first amplitude coefficient with value 1.
  • a value of one first amplitude coefficient may be one of In some embodiments, the bit size for one first amplitude coefficient may be 4 bits. In some embodiments, a value of an indicator or a field for one first amplitude coefficient may be one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ .
  • an indicator or a field for one first amplitude coefficient with value 0 may correspond to the first amplitude coefficient with value 0.
  • an indicator or a field for one first amplitude coefficient with value 1 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 2 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 3 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 4 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 5 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 6 may correspond to the first amplitude coefficient with value
  • an indicator or a field for one first amplitude coefficient with value 7 may correspond to the first amplitude coefficient with value 1.
  • the value of the first amplitude coefficient corresponding to the first antenna port group may be 1.
  • the value of the indicator or the field for the first amplitude coefficient corresponding to the first antenna port group may be 15.
  • the value of the first amplitude coefficient or the indicator or the field for the first amplitude coefficient corresponding to the first antenna port group may not be reported in the PMI.
  • the value of the first amplitude coefficient corresponding to the antenna port group which is not included in the second plurality of antenna port groups may be 0.
  • the value of the indicator or the field for the first amplitude coefficient corresponding to the antenna port group which is not included in the second plurality of antenna port groups may be 0.
  • the value of the first amplitude coefficient or the indicator or the field for the first amplitude coefficient corresponding to the antenna port group which is not included in the second plurality of antenna port groups may not be reported in the PMI.
  • a value of one second amplitude coefficient may be one of In some embodiments, the bit size for one second amplitude coefficient may be 4 bits. In some embodiments, a value of an indicator or a field for one second amplitude coefficient may be one of ⁇ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ⁇ .
  • an indicator or a field for one second amplitude coefficient with value 0 may correspond to the second amplitude coefficient with value 0.
  • an indicator or a field for one second amplitude coefficient with value 1 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 2 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 3 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 4 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 5 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 6 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 7 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 8 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 9 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 10 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 11 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 12 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 13 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 14 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 15 may correspond to the second amplitude coefficient with value 1.
  • a value of one second amplitude coefficient may be one of In some embodiments, the bit size for one second amplitude coefficient may be 4 bits. In some embodiments, a value of an indicator or a field for one second amplitude coefficient may be one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ .
  • an indicator or a field for one second amplitude coefficient with value 0 may correspond to the second amplitude coefficient with value 0.
  • an indicator or a field for one second amplitude coefficient with value 1 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 2 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 3 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 4 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 5 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 6 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 7 may correspond to the second amplitude coefficient with value 1.
  • a value of one second amplitude coefficient may be one of In some embodiments, the bit size for one second amplitude coefficient may be 3 bits. In some embodiments, a value of an indicator or a field for one second amplitude coefficient may be one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ .
  • an indicator or a field for one second amplitude coefficient with value 0 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 1 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 2 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 3 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 4 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 5 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 6 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 7 may correspond to the second amplitude coefficient with value 1.
  • one second amplitude coefficient may be a differential value corresponding to one first amplitude coefficient.
  • a value of one second amplitude coefficient may be one of In some embodiments, the bit size for one second amplitude coefficient may be 1 bit. In some embodiments, a value of an indicator or a field for one second amplitude coefficient may be one of ⁇ 0, 1 ⁇ . In some embodiments, an indicator or a field for one second amplitude coefficient with value 0 may correspond to the second amplitude coefficient with value
  • an indicator or a field for one second amplitude coefficient with value 1 may correspond to the second amplitude coefficient with value 1.
  • one second amplitude coefficient may be a differential value corresponding to one first amplitude coefficient.
  • the value of the second amplitude coefficient corresponding to the antenna port group which is not included in the second plurality of antenna port groups may be 0.
  • the value of the indicator or the field for the second amplitude coefficient corresponding to the antenna port group which is not included in the second plurality of antenna port groups may be 0.
  • the value of the second amplitude coefficient or the indicator or the field for the second amplitude coefficient corresponding to the antenna port group which is not included in the second plurality of antenna port groups may not be reported in the PMI.
  • a value of one third amplitude coefficient may be one of In some embodiments, the bit size for one third amplitude coefficient may be 3 bits. In some embodiments, a value of an indicator or a field for one third amplitude coefficient may be one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ .
  • an indicator or a field for one third amplitude coefficient with value 0 may correspond to the third amplitude coefficient with value
  • an indicator or a field for one third amplitude coefficient with value 1 may correspond to the third amplitude coefficient with value
  • an indicator or a field for one third amplitude coefficient with value 2 may correspond to the third amplitude coefficient with value
  • an indicator or a field for one third amplitude coefficient with value 3 may correspond to the third amplitude coefficient with value
  • an indicator or a field for one third amplitude coefficient with value 4 may correspond to the third amplitude coefficient with value
  • an indicator or a field for one third amplitude coefficient with value 5 may correspond to the third amplitude coefficient with value
  • an indicator or a field for one third amplitude coefficient with value 6 may correspond to the third amplitude coefficient with value
  • an indicator or a field for one third amplitude coefficient with value 7 may correspond to the third amplitude coefficient with value 1.
  • one third amplitude coefficient may be a differential value corresponding to one first amplitude coefficient and/or one second amplitude coefficient.
  • a value of one third amplitude coefficient may be one of In some embodiments, the bit size for one third amplitude coefficient may be 1 bit. In some embodiments, a value of an indicator or a field for one third amplitude coefficient may be one of ⁇ 0, 1 ⁇ . In some embodiments, an indicator or a field for one third amplitude coefficient with value 0 may correspond to the third amplitude coefficient with value In some embodiments, an indicator or a field for one third amplitude coefficient with value 1 may correspond to the third amplitude coefficient with value 1.
  • one example of the predefined codebook structure is enabled through per-TRP (port-group or resource) SD/FD basis selection and relative co-phasing/amplitude (including wideband and/or sunbband) .
  • Example formulation (N number of TRPs or TRP groups) is as below:
  • another example of the predefined codebook structure is enabled through per-TRP (port-group or resource) joint SD-FD basis selection and relative co-phasing/amplitude (including wideband and/or subband) .
  • Example formulation (N number of TRPs or TRP groups) :
  • a further example of the predefined codebook structure is enabled through per-TRP (port-group or resource) SD basis selection and joint (across N TRPs) FD basis selection.
  • Example formulation (N number of TRPs or TRP groups) :
  • some interactions are performed among the terminal device 130 and the network device 110 (such as, exchanging configuration (s) and so on) . It is to be understood that the interactions may be implemented either in one single signaling/message or multiple signaling/messages, including system information, radio resource control (RRC) message, downlink control information (DCI) message, uplink control information (UCI) message, media access control (MAC) control element (CE) and so on.
  • RRC radio resource control
  • DCI downlink control information
  • UCI uplink control information
  • CE media access control
  • the present disclosure is not limited in this regard.
  • each TRP/TRP group may be indexed by t, t ⁇ ⁇ 0, 1, ...T 1 -1 ⁇ or t ⁇ ⁇ 1, 2, ...T 1 ⁇ ) .
  • each TRP/TRP group corresponds to a CSI-RS allocation, such as, a CSI-RS unit, a CSI-RS resource, a group of CSI-RS resources, or a group of CSI-RS ports.
  • the number of the plurality of ports is represented to be P, where P may be one of ⁇ 2, 4, 8, 12, 16, 24, 32 ⁇ .
  • the P ports may be partitioned into T 1 port groups, T 1 may be 1 or 2 or 3 or 4, such that each TRP/TRP group may correspond to a group of CSI-RS ports.
  • the terminal device may be configured with a first plurality of CSI-RS resources.
  • the first plurality of CSI-RS resources may be applied for CSI acquisition.
  • the terminal device may determine or report at least one of: a transmission scheme, a second plurality of CSI-RS resources from the first plurality of CSI-RS resources, a number of the second plurality of CSI-RS resources, the index (es) of each one of the second plurality of CSI-RS resources and an index of a first CSI-RS resource from the first plurality of CSI-RS resources based on the first plurality of CSI-RS resources.
  • a first indication field to indicate at least one of: a transmission scheme, a second plurality of CSI-RS resources from the first plurality of CSI-RS resources, a number of the second plurality of CSI-RS resources, the index (es) of each one of the second plurality of CSI-RS resources and an index of a first CSI-RS resource from the first plurality of CSI-RS resources based on the first plurality of CSI-RS resources.
  • the terminal device may report or transmit the first indication field to the network device.
  • the transmission scheme may indicate a single-TRP hypothesis or a multi-TRP hypothesis.
  • the first CSI-RS resource may correspond to a strongest TRP or a strongest/largest power or a strongest amplitude coefficient.
  • the first indication field may be CSI-RS resource indication (CRI) field.
  • the first plurality of CSI-RS resources may be included in a CSI-RS resource set. In some embodiments, the first plurality of CSI-RS resources may be included in a plurality of CSI-RS resource sets. For example, each one of the first plurality of CSI-RS resources may be included in a separate CSI-RS resource set, and the first plurality of CSI-RS resources may be grouped/configured from the plurality of CSI-RS resource sets, for example, via RRC or MAC.
  • the transmission power of the first plurality of CSI-RS resources may be assumed or expected to be same.
  • the powerControlOffset and/or powerControlOffsetSS for the first plurality of CSI-RS resources may be assumed or expected to be same.
  • the indication may be configured/indicated via at least one of RRC, MAC or DCI.
  • the terminal device may report Layer 1 reference signal received power (L1-RSRP) for the first plurality of CSI-RS resources.
  • L1-RSRP Layer 1 reference signal received power
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) .
  • the field size of the first indication field may be ceil (log2 (T 1 +1) ) or bits, wherein first or last T 1 values of the first indication field may indicate single-TRP hypothesis, and each value indicating a corresponding CSI-RS resource index or TRP index, and one value (the last one or the first one) of the first indication field may indicate multi-TRP hypothesis, wherein, the multi-TRP hypothesis may be based on all of the T 1 TRPs.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1A or Table 1B.
  • x_cri may be the value of the first indication field.
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) .
  • the field size of the first indication field may be 1 bit, wherein value 0 of the first indication field may indicate single-TRP hypothesis, wherein, the single-TRP hypothesis may be based the first CSI-RS resource or the first TRP or the strongest TRP, and value 1 of the first indication field may indicate multi-TRP hypothesis, wherein, the multi-TRP hypothesis may be based on all of the T 1 TRPs.
  • the field size of the first indication field may be 1 bit, wherein value 1 of the first indication field may indicate single-TRP hypothesis, wherein, the single-TRP hypothesis may be based the first CSI-RS resource or the first TRP or the strongest TRP, and value 0 of the first indication field may indicate multi-TRP hypothesis, wherein, the multi-TRP hypothesis may be based on all of the T 1 TRPs.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1C.
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) and/or the number of the second plurality of CSI-RS resources and/or the index (es) of the CSI-RS resource in the second plurality of CSI-RS resources.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1D-1, Table 1D-2, Table 1D-3, .
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) and/or the number of the second plurality of CSI-RS resources and/or the index (es) of the CSI-RS resource in the second plurality of CSI-RS resources and/or the index of the first CSI-RS resource.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1E-1, Table 1E-2, Table 1E-3, .
  • the first indication field may indicate the index of the first CSI-RS resource.
  • the field size of the first indication field may be ceil (log2 (T 1 ) ) or bits.
  • the transmission scheme may be multi-TRP hypothesis, and the multi-TRP hypothesis may be based on all of the T 1 TRPs.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1F.
  • first CSI-RS resource may be fixed within the second plurality of CSI-RS resources.
  • the first CSI-RS resource may always be applied for at least the multi-TRP hypothesis.
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) .
  • the field size of the first indication field may be 1 bit, wherein value 0 of the first indication field may indicate single-TRP hypothesis, wherein, the single-TRP hypothesis may be based the first CSI-RS resource or the first TRP or the strongest TRP, and value 1 of the first indication field may indicate multi-TRP hypothesis, wherein, the multi-TRP hypothesis may be based on all of the T 1 TRPs.
  • the field size of the first indication field may be 1 bit, wherein value 1 of the first indication field may indicate single-TRP hypothesis, wherein, the single-TRP hypothesis may be based the first CSI-RS resource or the first TRP or the strongest TRP, and value 0 of the first indication field may indicate multi-TRP hypothesis, wherein, the multi-TRP hypothesis may be based on all of the T 1 TRPs.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1G.
  • first CSI-RS resource may be fixed within the second plurality of CSI-RS resources.
  • the first CSI-RS resource may always be applied for the single-TRP hypothesis and the multi-TRP hypothesis.
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) and/or the number of the second plurality of CSI-RS resources and/or the index (es) of the CSI-RS resource in the second plurality of CSI-RS resources.
  • the field size of the first indication field may be bits.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1H-1, Table 1H-2, Table 1H-3.
  • first CSI-RS resource may be fixed within the second plurality of CSI-RS resources.
  • the first CSI-RS resource may always be applied for the multi-TRP hypothesis.
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) and/or the number of the second plurality of CSI-RS resources and/or the index (es) of the CSI-RS resource in the second plurality of CSI-RS resources.
  • the field size of the first indication field may be bits.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1J-1, Table 1J-2, Table 1J-3.
  • first CSI-RS resource may be fixed within the second plurality of CSI-RS resources.
  • the first CSI-RS resource may always be applied for the single-TRP hypothesis and the multi-TRP hypothesis.
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) and/or the number of the second plurality of CSI-RS resources and/or the index (es) of the CSI-RS resource in the second plurality of CSI-RS resources and/or index of the first CSI-RS resource.
  • the field size of the first indication field may be bits.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1K-1, Table 1K-2, Table 1K-3.
  • first CSI-RS resource may be fixed within the second plurality of CSI-RS resources.
  • the first CSI-RS resource may always be applied for the multi-TRP hypothesis.
  • the first indication field may indicate the transmission scheme (e.g. single-TRP hypothesis or multi-TRP hypothesis) and/or the number of the second plurality of CSI-RS resources and/or the index (es) of the CSI-RS resource in the second plurality of CSI-RS resources and/or the index of the first CSI-RS resource.
  • the field size of the first indication field may be bits.
  • the example of the first indication field may be at least one of row and/or column in the following Table 1L-1, Table 1L-2, Table 1L-3.
  • the at least one codebook indicator may be conditioned or based on the first indication field or based on the second plurality of CSI-RS resources indicated by the first indication field.
  • the first indication field or the second plurality of CSI-RS resources indicated by the first indication field may be the latest reported one prior to the reporting of the at least one codebook indicator.
  • the reference signals and/or channels from TRPs not corresponding to any one of the second plurality of CSI-RS resources may be muted or rate-matched.
  • the terminal device may be configured with a SRS resource set or a first plurality of SRS resources.
  • the SRS resource set or the first plurality of SRS resources may be configured with usage of antenna switching.
  • the first plurality of CSI-RS resources may be configured to be associated with the SRS resource set or the first plurality of SRS resources.
  • the first plurality of SRS resources may be included in a SRS resource set.
  • the number of SRS resources of the first plurality of SRS resources or in the SRS resource set may be N SRS .
  • each one of the SRS resource of the first plurality of SRS resources or in the SRS resource set may be configured with one port.
  • the terminal device may be configured with a SRS resource.
  • the SRS resource may be configured with usage of antenna switching. For example, for downlink CSI acquisition.
  • the first plurality of CSI-RS resources may be configured to be associated with the SRS resource.
  • the number of ports of the SRS resource may be P SRS .
  • the terminal device may be configured with or able to support or with capability of xTxR.
  • the terminal device may be configured with at least one CSI-RS resource (one or two or three or four CSI-RS resources) for each of the SRS resource set (s) with higher layer parameter usage in SRS-ResourceSet set to 'antennaSwitching' if configured.
  • the terminal device may determine and report an indication field (e.g. the first indication field, or CRI) to indicate one or more of the at least one CSI-RS resource to be associated with the transmission of the SRS resource set.
  • the terminal device may calculate the precoder used for the transmission of SRS based on measurement of the latest indicated/reported one or more CSI-RS resources.
  • the terminal device can be configured with at least one sets of the higher layer parameters alpha, p0, srs-PowerControlAdjustmentStates and at least one pathlossReferenceRS in SRS-ResourceSet, and each set of the higher layer parameter alpha, p0, srs-PowerControlAdjustmentStates and each one of the at least one pathlossReferenceRS is associated with one of the at least one CSI-RS resource.
  • the terminal device may apply the corresponding one set of the higher layer parameter alpha, p0, srs-PowerControlAdjustmentStates and each one of the at least one pathlossReferenceRS for the SRS transmission power based on the indication field.
  • the terminal device may be configured with at least one of 2T2R, 4T4R and 8T8R. In some embodiments, the terminal device may support at least one of 2T2R, 4T4R and 8T8R.
  • the terminal device may not be expected to update the SRS precoding information if the gap from the last symbol of the reception of the last one of the at least one aperiodic CSI-RS resource and the first symbol of the aperiodic SRS transmission is less than 42 ⁇ 2 max (0, ⁇ -3) OFDM symbols, where the subcarrier spacing (SCS) configuration ⁇ is the smallest SCS configuration between the at least one CSI-RS resource and the SRS transmission.
  • SCS subcarrier spacing
  • the presence of the at least one associated CSI-RS may be indicated by the SRS request field if the value of the SRS request field is not '00' and if the scheduling DCI is not used for cross carrier or cross bandwidth part scheduling.
  • the terminal device if the terminal device is configured with minimumSchedulingOffsetK0 in the active DL BWP and the currently applicable minimum scheduling offset restriction K 0, min is larger than 0, the terminal device does not expected to receive the scheduling DCI with the SRS request field value other than '00' .
  • the at least one CSI-RS is located in the same slot as the SRS request field.
  • any of the TCI states configured in the scheduled CC shall not be configured with qcl-Type set to 'typeD' .
  • the slot offsets of the at least one CSI-RS Resource are configured within X ⁇ ⁇ 1 or 2 ⁇ slots, without downlink (DL) /uplink (UL) switching in between any two of the at least one CSI-RS resource.
  • the terminal device may expect no without DL/UL switching in between the SRS resources of the SRS resource set.
  • the actual transmission of the first plurality of SRS resources or the SRS resource set may be conditioned or based on the first indication field. In some embodiments, the actual transmission of the first plurality of SRS resources or the SRS resource set may be conditioned or based on the CSI-RS resource (s) (or TRP (s) ) indicated by the first indication field or conditioned/based on the second plurality of CSI-RS resources or conditioned/based on the first CSI-RS resource.
  • the terminal device may be configured with a plurality of sets of power control parameters and/or a plurality of pathloss RS for the SRS resource set or for the first plurality of SRS resources, wherein each one set of the plurality of sets of power control parameters and/or each one of the plurality of pathloss RS may correspond to one of the first plurality of CSI-RS resources.
  • a first set of power control parameters and/or a first pathloss RS may be selected to be applied for determining transmission power for the first plurality of SRS resources or the SRS resource set.
  • the selection or determination of the first set of power control parameters and/or the first pathloss RS may be based on or conditioned on the first indication field.
  • the selection or determination of the first set of power control parameters and/or the first pathloss RS may be based on or conditioned on the first CSI-RS resource.
  • the one set of power control parameters and/or the one of the pathloss RS which corresponds to the indicated CSI-RS resource in the first indication field may be applied for power control of the SRS transmission. For example, there is only one CSI-RS resource indicated by the first indication field. For another example, in case of the indication field indicating single-TRP hypothesis. In some embodiments, the one set of power control parameters and/or the one of the pathloss RS which corresponds to the strongest TRP (or corresponds to the first CSI-RS resource) or the first one of the selected TRPs or the first TRP is applied for power control of the SRS transmission. For example, there are more than one CSI-RS resource indicated by the first indication field. For another example, in case of the indication field indicating multi-TRP hypothesis.
  • only one set of the plurality of sets of power control parameters and/or only one of the plurality of pathloss RS may be applied for the transmission of SRS. For example, based on this, the transmission power for SRS may be consistent, otherwise network can not obtain the DL CSI accurately.
  • the first indication field may indicate at least one of a number of layers, actual number of SRS ports and actual number of SRS resources for the SRS transmission.
  • the actual number of SRS resources for the SRS transmission may be N S .
  • the remaining N SRS –N S SRS resources of the first plurality of SRS resources or the SRS resource set may not be transmitted.
  • there may be a plurality of sets of power control parameters and/or a plurality of pathloss RS may be configured for the SRS resource set or for the first plurality of SRS resources, wherein each one set of power control parameters and/or each one of the pathloss RS may correspond to one of the plurality of CSI-RS resources, and the terminal device may determine one and only one set of power control parameters and/or one pathloss RS for determining transmission power of SRS.
  • the SRS resource set or the first plurality of SRS resources may be configured with a first plurality of associated CSI-RS resources.
  • the network device may further indicate a subset of the first plurality of associated CSI-RS resources (For example, a second plurality of associated CSI-RS resources.
  • the actual transmission of SRS may be conditioned on the subset of the first plurality of associated CSI-RS resources or the second plurality of associated CSI-RS resources.
  • the network device may further indicate at least one of the actual number of SRS ports and the actual number of SRS resources for SRS transmission. For example, indicated by MAC and/or DCI.
  • the CSI-RS resource with lowest ID or the first one of the CSI-RS resource (single-TRP) or all of the plurality of CSI-RS resources (multi-TRP) may be applied for SRS transmission.
  • the selection/indication of at least one of: the number of the second plurality of CSI-RS resources, the index of CSI-RS resource in the second plurality of CSI-RS resources, the index of the first CSI-RS resource, and the transmission scheme may be implicitly indicated by at least one parameter for the SRS resource set or the first plurality of SRS resources.
  • the at least one parameter may include at least one of time/frequency resource for the SRS transmission, the SRS sequence, comb, comb offset and cyclic shift (CS) values.
  • a first SRS resource set may be transmitted.
  • a second SRS resource set may be transmitted.
  • each SRS resource may be associated with one set of power control parameters and/or one pathloss RS, and the transmission of the SRS resource may be based on the associated set of power control parameters and/or the associated pathloss RS.
  • the terminal device may be configured with a first cyclic shift value for the SRS resource set or the first plurality of SRS resources. And the terminal device may be configured with cyclic shift hopping for the SRS resource set or the first plurality of SRS resources. For example, a second cyclic shift may be applied for the actual transmission of the SRS resource set or the first plurality of SRS resources. In some embodiments, the second cyclic shift may be based on the first cyclic shift and a parameter of cyclic shift hopping. In some embodiments, the frequency resource mapping for the SRS resource set or the first plurality of SRS resources may be determined based on the second cyclic shift. For example, not always based on the first cyclic shift.
  • the second cyclic shift for antenna port p i may be
  • p i may be the antenna port index.
  • i may be at least one of ⁇ 0,1, 2, 3 ⁇ or ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ .
  • the maximum number of cyclic shifts may be 8 or 12 or 6 or 24.
  • n hopping may be the value of the parameter of cyclic shift hopping.
  • the value of n hopping may be based on at least one of an identity (ID) of the terminal device, a serving cell index, a TRP index, a CSI-RS resource index, a symbol index and a slot index.
  • the frequency domain resource allocation for the SRS is based on the value of For example,
  • K TC may be the value of the transmission comb number.
  • K TC ⁇ ⁇ 2, 4, 8, 12 ⁇ may be contained in the higher-layer parameter transmissionComb.
  • K TC may be the value of the transmission comb offset.
  • the higher-layer parameter transmissionComb ifor the SRS resource.
  • a terminal device comprise circuitry configured to perform: receiving, from a network device, at least one configuration for codebook.
  • the terminal device comprise circuitry configured to perform: determining the at least one codebook indicator based on the at least one configuration for codebook.
  • the terminal device comprise circuitry configured to perform: transmitting, to the network device, the at least one codebook indicator.
  • the terminal device comprise circuitry configured to perform: receiving, from the network device, at least one CSI-RS based on the at least one configuration.
  • the network device comprises circuitry configured to perform: transmitting, to the terminal device, the at least one configuration for codebook.
  • the network device comprises circuitry configured to perform: receiving, from the terminal device, the at least one codebook indicator.
  • the network device comprises circuitry configured to perform: transmitting, to the terminal device, at least one CSI-RS based on the at least one configuration.
  • Fig. 5 is a simplified block diagram of a device 500 that is suitable for implementing embodiments of the present disclosure.
  • the device 500 can be considered as a further example implementation of the terminal device or the network device as shown in Fig. 1. Accordingly, the device 500 can be implemented at or as at least a part of the terminal device or the network device.
  • the device 500 includes a processor 510, a memory 520 coupled to the processor 510, a suitable transmitter (TX) and receiver (RX) 540 coupled to the processor 510, and a communication interface coupled to the TX/RX 540.
  • the memory 520 stores at least a part of a program 530.
  • the TX/RX 540 is for bidirectional communications.
  • the TX/RX 540 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the eNB, Un interface for communication between the eNB and a relay node (RN) , or Uu interface for communication between the eNB and a terminal device.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the eNB and a relay node (RN)
  • Uu interface for communication between the eNB and a terminal device.
  • the program 530 is assumed to include program instructions that, when executed by the associated processor 510, enable the device 500 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Fig. 2 to 4.
  • the embodiments herein may be implemented by computer software executable by the processor 510 of the device 500, or by hardware, or by a combination of software and hardware.
  • the processor 510 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 510 and memory 520 may form processing means 550 adapted to implement various embodiments of the present disclosure.
  • the memory 520 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 520 is shown in the device 500, there may be several physically distinct memory modules in the device 500.
  • the processor 510 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to any of Figs. 2-4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • machine readable storage medium More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.
  • terminal device refers to any device having wireless or wired communication capabilities.
  • the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Ultra-reliable and Low Latency Communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, devices for Integrated Access and Backhaul (IAB) , Small Data Transmission (SDT) , mobility, Multicast and Broadcast Services (MBS) , positioning, dynamic/flexible duplex in commercial networks, reduced capability (RedCap) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including Satellites and High Altitude Platforms (HAPs) encompassing Unmanned Aircraft Systems (UAS) , eX
  • UE user equipment
  • the ‘terminal device’ can further has ‘multicast/broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4/IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporate one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM.
  • SIM Subscriber Identity Module
  • the term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
  • network device refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , Network-controlled Repeaters, and the like.
  • NodeB Node B
  • eNodeB or eNB evolved NodeB
  • gNB next generation NodeB
  • TRP transmission reception point
  • RRU remote radio unit
  • RH radio head
  • RRH remote radio head
  • IAB node a low power node such
  • the terminal device or the network device may have Artificial intelligence (AI) or Machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
  • AI Artificial intelligence
  • Machine learning capability it generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
  • the terminal or the network device may work on several frequency ranges, e.g. FR1 (410 MHz –7125 MHz) , FR2 (24.25GHz to 71GHz) , frequency band larger than 100GHz as well as Tera Hertz (THz) . It can further work on licensed/unlicensed/shared spectrum.
  • the terminal device may have more than one connections with the network devices under Multi-Radio Dual Connectivity (MR-DC) application scenario.
  • MR-DC Multi-Radio Dual Connectivity
  • the terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
  • the network device may have the function of network energy saving, Self-Organising Networks (SON) /Minimization of Drive Tests (MDT) .
  • the terminal may have the function of power saving.
  • test equipment e.g. signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator.
  • the embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future.
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or the sixth generation (6G) networks.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente divulgation se rapportent aux communications. Selon des modes de réalisation de la présente divulgation, un dispositif terminal reçoit, d'un dispositif de réseau, au moins une configuration pour une première pluralité de signaux de référence ; et la transmission, au dispositif de réseau, d'au moins un indicateur de livre de code sur la base d'une seconde pluralité de signaux de référence, la seconde pluralité de signaux de référence étant sélectionnée dans la première pluralité de signaux de référence ; ou la transmission, au dispositif de réseau, d'au moins un signal de référence de sondage (SRS) sur la base de la seconde pluralité de signaux de référence, la seconde pluralité de signaux de référence étant indiquée avec un premier champ d'indication.
PCT/CN2022/111924 2022-08-11 2022-08-11 Procédés, dispositifs et support lisible par ordinateur pour des communications WO2024031580A1 (fr)

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CN107980209A (zh) * 2017-02-16 2018-05-01 香港应用科技研究院有限公司 大规模mimo通信系统中报告信道状态信息(csi)的方法和装置
US20180287757A1 (en) * 2017-03-28 2018-10-04 Samsung Electronics Co., Ltd. Method and apparatus for channel state information (csi) acquisition with dl and ul reference signals

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