WO2021016933A1 - Transmission of channel state information - Google Patents

Transmission of channel state information Download PDF

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Publication number
WO2021016933A1
WO2021016933A1 PCT/CN2019/098658 CN2019098658W WO2021016933A1 WO 2021016933 A1 WO2021016933 A1 WO 2021016933A1 CN 2019098658 W CN2019098658 W CN 2019098658W WO 2021016933 A1 WO2021016933 A1 WO 2021016933A1
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WO
WIPO (PCT)
Prior art keywords
csi
csi report
target
reports
payload
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PCT/CN2019/098658
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English (en)
French (fr)
Inventor
Hao Liu
Filippo Tosato
Marco MASO
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN201980099055.3A priority Critical patent/CN114208052B/zh
Priority to PCT/CN2019/098658 priority patent/WO2021016933A1/en
Publication of WO2021016933A1 publication Critical patent/WO2021016933A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to a method, device, apparatus and computer readable storage medium for the transmission of channel state information (CSI) .
  • CSI channel state information
  • CSI channel state information
  • the CSI part 1 may comprise the channel quality indicator (CQI) information and the parameters needed to determine the payload size of the CSI part 2.
  • the CSI part 2 may comprise the bulk of compressed PMI and be transmitted on the Physical Uplink Shared Channel (PUSCH) .
  • the PMI is represented by a matrix for each reported layer, each containing as many column vectors as the number of sub-bands (SB) .
  • the spatial domain (SD) and frequency domain (FD) compression operations are applied to these PMI matrices across their rows and columns respectively.
  • an omission rule for partially reporting CSI on the PUSCH has been introduced to reduce the overhead in reporting CSI from user equipment (UE) to the Base Transceiver Station (BTS) .
  • CSI reports included in the CSI part 2 each are divided into two separate boxes based on the even or odd SB.
  • the CSI reports may be partially omitted from a box with the lowest priority towards boxes with higher priorities, until the payload for reporting CSI matches the allocated resource.
  • CSI has been extended to higher rank with rank indicator (RI) 3 or 4 for supporting more data streams per UE for Single-User Multiple Input Multiple Output (SU-MIMO) and Multi-User Multiple Input Multiple Output (MU-MIMO) in the downlink.
  • RI rank indicator
  • SU-MIMO Single-User Multiple Input Multiple Output
  • MU-MIMO Multi-User Multiple Input Multiple Output
  • CSI feedback overhead has a wide dynamic range depending on the number of transmission layers which may be increased due to rank extension, and the number of non-zero (NZ) LC coefficients included in the matrix per layer.
  • example embodiments of the present disclosure provide a solution for the transmission of CSI.
  • a first device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device to, in response to a determination that a payload of channel state information (CSI) to be transmitted in a slot exceeds a size of resource allocated for reporting the CSI to the first device, determine, from a plurality of CSI reports, a subset of CSI reports preceding a target CSI report based on the payload and the size of the resource, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI; determine a payload of the first portion of the target CSI report and transmit at least a CSI parameter set of the plurality of CSI report and the subset of the CSI reports to a second device, the CSI parameter set indicating the payload of the first portion of the target CSI report.
  • CSI channel state information
  • a second device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device to determine a subset of a plurality of channel state information (CSI) reports, based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports and a size of resource allocated for reporting CSI; receive, from a first device, the CSI parameter set and the subset of CSI reports; determine, based on the CSI parameter set and the size of the resource, whether to receive a target CSI report following the subset of CSI reports, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI, the CSI parameter set indicating at least a payload of the first portion of the target CSI report; and in response to a determination that the target CSI report is to be received, receive the first CSI report.
  • CSI channel state information
  • a method implemented at a first device comprises: in response to a determination that a payload of channel state information (CSI) to be transmitted in a slot exceeds a size of resource allocated for reporting the CSI to the first device, determining, from a plurality of CSI reports, a subset of CSI reports preceding a target CSI report based on the payload and the size of the resource, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI; determining a payload of the first portion of the target CSI report; and transmitting at least a CSI parameter set of the plurality of CSI reports and the subset of the CSI reports to a second device, the CSI parameter set indicating at least the payload of the first portion of the target CSI report.
  • CSI channel state information
  • a method implemented at a second device comprises determining a subset of a plurality of channel state information (CSI) reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports and a size of resource allocated for reporting CSI; receiving, from a first device, the CSI parameter set and the subset of CSI reports; determining, based on the CSI parameter set and the size of the resource, whether to receive a target CSI report following the subset of CSI reports, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI, the CSI parameter set indicating at least a payload of the first portion of the target CSI report; and in response to a determination that the target CSI report is to be received, receiving the first portion of the target CSI report.
  • CSI channel state information
  • an apparatus comprising means for in response to a determination that a payload of channel state information (CSI) to be transmitted in a slot exceeds a size of resource allocated for reporting the CSI to the first device, determining, from a plurality of CSI reports, a subset of CSI reports preceding a target CSI report based on the payload and the size of the resource, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI; means for determining a payload of the first portion of the target CSI report; and means for transmitting at least a CSI parameter set of the plurality of CSI report and the subset of the CSI reports to a second device, the CSI parameter set indicating at least the payload of the first portion of the target CSI report.
  • CSI channel state information
  • an apparatus comprising means for determining a subset of a plurality of channel state information (CSI) reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports and a size of resource allocated for reporting CSI; receiving, from a first device, the subset of CSI reports; means for determining, based on the CSI parameter set and the size of the resource, whether to receive a target CSI report following the subset of CSI reports, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI, the CSI parameter set indicating at least a payload of the first portion of the target CSI report; and means for in response to a determination that the target CSI report is to be received, receiving the first portion of the target CSI report.
  • CSI channel state information
  • a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the above third or fourth aspect.
  • FIG. 1 shows an example communication network in which example embodiments of the present disclosure may be implemented
  • FIG. 2 shows a diagram of a signaling flow of the transmission of CSI according to some example embodiments of the present disclosure
  • Fig. 3 illustrates a flowchart of a method implemented at a first device according to some embodiments of the present disclosure
  • Fig. 4 illustrates a flowchart of a method implemented at a second device according to some other embodiments of the present disclosure
  • Fig. 5 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure.
  • Fig. 6 illustrates a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, 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 future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, 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 future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the a
  • the term “first device” refers to any end device that may be capable of wireless communication.
  • the first device may be a terminal device.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/
  • the term “second device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the second device may be a network device.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • RRU
  • a terminal device may have an active connection with a network device when being located within the corresponding cell.
  • the terminal device may communicate with that network device on the frequency band in both an uplink (UL) and a downlink (DL) .
  • the terminal device may need to switch a link in one direction such as the UL to a further network device due to various reasons such as quality degradation in the UL.
  • the CSI has been compressed through discrete Fourier transform (DFT) based operation to harness correlation in FD and reduce the number of meaningful coefficients required to describe the PMI.
  • DFT discrete Fourier transform
  • the LC coefficients to be reported are sparsified in a transformed domain, and their energy is mainly concentrated and constrained to a few FD basis vectors.
  • the CSI has a dynamic payload size, as shown in Table 1.
  • N 1 is the number of antenna ports in horizontal dimension for a polarization
  • N 2 is the number of antenna ports in vertical dimension for a polarization
  • O 1 is the oversampling factor in horizontal dimension
  • O 2 is the oversampling factor in vertical dimension
  • L is the number of SD basis components in a polarization
  • N 3 is the number of configured PMI sub-bands
  • K NZ is the total number of NZ coefficients across layers
  • p and ⁇ is a ratio
  • M i is the number of FD basis components in layer i
  • the range of the dynamic payload size of CSI part 2 in Rel-16 is from 84 bits to 863 bits. From the perspective of BTS, it is hardly to predict a correct amount of resource to be allocated for reporting CSI.
  • Embodiments of the present disclosure provide a solution for partially reporting CSI on PUSCH based on the resource allocated on PUSCH.
  • the first device selects a subset of CSI reports to be entirely transmitted based on payloads of CSI reports and the allocated resource.
  • the first device determines whether the remaining of the resource is sufficient to transmit a portion of a target CSI report following the subset of CSI reports. Then, the first device transmits the portion of the target CSI report or entirely omits the target CSI report based on the determination. As such, the overhead of CSI feedback with a dynamic payload size can be reduced.
  • the present disclosure also proposes a CSI message with a dynamic payload size of CSI part 2, so that the CSI message can match the resource allocated by the BTS.
  • a mechanism of indicating the payload size of the first portion of the target CSI report partially or entirely omitted is provided.
  • FIG. 1 shows an example communication network 100 in which implementations of the present disclosure can be implemented.
  • the communication network 100 includes a first device 110 and a second device 120.
  • the network 100 can provide one or more cells to serve the second device 120. It is to be understood that the numbers of first device, second device and/or the cells are given for the purpose of illustration without suggesting any limitations to the present disclosure.
  • the communication network 100 may include any suitable number of network devices, terminal devices and/or cells adapted for implementing implementations of the present disclosure.
  • the first device 110 may communicate data and CSI to the second device 120, and the second device 120 may allocate resource for the first device 110 and receive CSI from the first device 110.
  • a link from the first device 110 to the second device 120 is referred to as an uplink (UL)
  • a link from the second device 120 to the first device 110 is referred to as a downlink (DL) .
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , and the like.
  • GSM Global System for Mobile Communications
  • LTE Long Term Evolution
  • LTE-A LTE-Evolution
  • LTE-Advanced LTE-A
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GERAN GSM EDGE Radio Access Network
  • 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
  • the CSI may ensure reliability of the wireless communication between the first device 110 and the second device 120.
  • the process for reporting the CSI is also called as “CSI feedback” .
  • the second device 120 may allocate resource for the first device 110. Then, the first device 110 may report the CSI to the second device 120 on the PUSCH.
  • the CSI part 2 may be divided into basic domain CSI parameters and transformed domain CSI parameters.
  • the basic domain CSI parameters at least include an indicator for the SD basis subset selection including the oversampling factor, an indicator for the FD basis subset selection, and a strongest coefficient indicator (SCI) .
  • the transformed domain CSI parameters include bitmaps corresponding to the non-zero LC coefficients in a matrix per layer and indicating the locations of the non-zero LC coefficients, amplitude of the non-zero LC coefficients including reference amplitude for weaker polarization per layer, and phase of the non-zero LC coefficients per layer.
  • the transformed domain CSI parameters are included in a plurality of CSI reports, and the basic domain CSI parameters are related to the plurality of CSI reports, and included in a CSI parameter set of the plurality of the CSI reports.
  • the first device 110 may determine the matrix based on the downlink channel measurement and compression operation.
  • the matrix also referred to as a LC coefficient matrix, is used to characterize a channel between the first device 110 and the second device 120.
  • the matrix is compressed in both SD and FD, and thus including spatial components in the spatial domain and frequency components in the frequency domain.
  • the matrix includes a set of linear combination (LC) coefficients with greatly reduced number than ever, and the matrix has multiple spatial components and frequency components as two dimensions.
  • the bitmap corresponding to the LC coefficient matrix is used to indicate the locations of a set of non-zero LC coefficients for quantizing the channel. This aspect will be discussed in detail below.
  • FIG. 2 shows a diagram of a signaling flow of the transmission of CSI according to some example embodiments of the present disclosure.
  • the process 200 will be described with reference to FIG. 1.
  • the process 200 may involve the first device 110 and the second device 120 as illustrated in FIG. 1.
  • the first device 110 may receive 210 the downlink control information from the second device 120 and obtain a resource indication for indicating a size of resource allocated for reporting the CSI by the second device 120.
  • the size of resource allocated for reporting the CSI is known for both the first device 110 and the second device 120.
  • the first device 110 may compare a payload of CSI to be transmitted in a slot with the size of resource. Based on a determination that the payload of CSI to be transmitted in a slot exceeds the size of resource, the first device 110 determines 215, from a plurality of CSI reports, a subset of CSI reports, preceding a target CSI report based on the payload and the size of the resource.
  • the target CSI report may be divided into a first portion and a second portion, and at least the second portion of the target CSI is to be omitted in the reporting of the CSI.
  • the second device 120 may obtain payloads of the plurality of CSI reports by receiving part 1 of the CSI message.
  • the second device 120 determines 225 the subset of the plurality of CSI reports based on the payloads of the plurality of CSI reports and the size of resource.
  • the first device 110 determines 220 a payload of the first portion of the target CSI report, and transmits 230 at least the CSI parameter set of the plurality of CSI reports and the subset of the CSI reports to the second device 120, with the CSI parameter set at least indicating the payload of the first portion of the target CSI report.
  • the second device 120 receives 235 the subset of the CSI reports included in the CSI part 2.
  • the second device 120 determines 240, based on the CSI parameter set and the size of the resource, whether to receive the target CSI report following the subset of the CSI reports. Based on the determination that the target CSI report is to be received, the second device 120 receives 245 the first portion of the target CSI report.
  • FIG. 3 illustrates a flowchart of a method implemented at the first device 110 according to some embodiments of the present disclosure.
  • the method 300 can be implemented at the first device 110 as shown in FIG. 1. For the purpose of discussion, the method 300 will be described with reference to FIG. 1.
  • the second device 120 may indicate, in the resource indication, the resource allocated for reporting the CSI to the first device 110.
  • the first device 110 may determine whether a payload of CSI to be transmitted in a slot exceeds the size of resources allocated by the second device 120.
  • the first device 110 intends to report, in a slot, a plurality of CSI reports N Rep which are included in the CSI part 2, and each of the N Rep CSI reports has a respective priority.
  • the CSI part 1 includes the parameters needed to determine the payload size of the CSI part 2, for example, a respective payload size of each of the plurality of the CSI reports.
  • the first device 110 determines, from a plurality of CSI reports, a subset of CSI reports preceding a target CSI report based on the payload and the size of the resource, at 320.
  • the first device 110 may obtain the N Rep CSI reports with respective priorties, and determine the subset of CSI reports in descending order of the priorities, such that the payload of the subset of CSI reports matches the size of the allocated resource.
  • the first device 110 may divide each of the plurality of CSI reports into a first portion and a second portion, and each portion and the CSI parameter set are assigned a respective priority for CSI omission rule, as shown in Table 2 below.
  • each CSI report may be further divided into the first portion and the second portion with a respective priority, i.e., from priority 1 to 2N Rep .
  • each CSI report is further divided into a first portion and a second portion by determining a polarization of the matrix in a respective CSI report in the SD.
  • the first portion and the second portion of N Rep CSI reports are determined based on the polarization.
  • the matrix includes a set of LC coefficients for quantizing the channel between the first device 110 and the second device 120, and the matrix has spatial components and frequency components, in which a polarization has a half of spatial components in the SD.
  • the polarization of the matrix in a CSI report may be determined by means of a strongest coefficient indicator (SCI) .
  • SCI strongest coefficient indicator
  • the first device 110 may determine the SCI based on the spatial components where the strongest coefficient is located. Then, a half of the matrix containing the SCI in the SD is determined to have a first polarization, while the other half of the matrix is determined to have a second polarization.
  • each CSI report is further divided into a first portion and a second portion by indices of frequency components of the matrix of the respective CSI.
  • the even indices of frequency components of the matrix may be determined as the first portion of the CSI report, while the odd indices of frequency components of the matrix may be determined as the second portion of the CSI report.
  • a part of frequency components of a matrix in a CSI report may be determined as the first portion of the CSI report, while the other part of the frequency components of the matrix may be determined as the second portion of the CSI report.
  • a part of frequency components of the matrix may contain the first indexes of frequency components, while the other part may contain the remaining indexes of frequency components.
  • such a part of frequency components of the matrix may contain the first and the last indexes of frequency components, while the other part may contain the remaining indexes of frequency components.
  • the determination whether the payload of CSI to be transmitted in a slot exceeds the size of resource allocated on PUSCH as shown at 310 may be made as follows:
  • the first device 110 determines that the allocated resource is sufficient to feedback the whole CSI part 2, that is, all of the N Rep CSI reports will be reported without triggering the CSI omission rule, in a case of:
  • RA is the size of allocated resources on PUSCH for reporting CSI
  • S 0 is the payload size of the CSI parameter set including basic domain CSI parameters for all the N Rep CSI reports
  • the first device 110 may determine that the allocated resource is not sufficient to feedback the whole CSI part 2, and thus the plurality of CSI reports will be partially transmitted with the CSI omission rule being triggered, in a case of:
  • N U represents a target CSI report that may be partially or entirely omitted
  • S n is the payload size of CSI report n.
  • the target CSI report N U includes a first portion and a second potion, and at least the second portion of the target CSI report and the CSI reports with lower priorities than that of the target CSI report are to be omitted.
  • the first device 110 may determine that none of the N Rep CSI reports will be reported, in a case of:
  • the payload size S 0 is only related to RI n reported in CSI part 1 for all of the plurality of CSI reports and is calculated as:
  • the payload size S n is determined by the total number of non-zero LC coefficients across layers K NZ, n as well as RI n specified in CSI part 1 for CSI report n, and can be calculated as:
  • the CSI omission rule is triggered.
  • the first device 110 determines the payload of the first portion of the target CSI report at 330. In some example embodiments, the first device 110 may then compare the payload of the first portion of the target CSI with a difference between the size of the resource and the payload of the subset of the CSI reports.
  • the first device 110 transmits at least the CSI parameter set of the plurality of CSI reports and the subset of the CSI reports to the second device 120.
  • the CSI parameter set indicates at least the payload of the first portion of the target CSI report.
  • the first device 110 may transmit the first portion of the target CSI report after the subset of CSI report.
  • the first device 110 may determine that the target CSI report is to be partially transmitted, i.e., the first portion of the target CSI report being transmitted and the second portion of the target CSI report being omitted, as below:
  • the CSI reports with a priority level higher than the target CSI reports as well as CSI messages in Priority 0 form the subset of CSI reports, and the subset of CSI reports along with the first portion of the target CSI report N U are to be transmitted, while the remaining portions of N Rep CSI reports are omitted by the first device 110.
  • the payload of the first portion of the target CSI report is larger than the difference, for example, which may be determined as below:
  • the first device 110 may omit the first portion of the target CSI report N U .
  • the entire target CSI report N U is omitted, and only the subset of CSI reports is to be transmitted from the first device 110 to the second device 120.
  • the first device 110 transmits at least the subset of the CSI reports to the second device 120.
  • the first device 110 may utilize the CSI parameter set to indicate at least the payload of the first portion of the target CSI report.
  • the first device 110 may inform the second device 120 of the payload of the first portion of the target CSI report, so that the second device 120 can determine the target CSI report is partially or entirely omitted, which will be described in detail below.
  • the first device 110 may utilize the CSI parameter set to indicate at least the payload of the first portion of the target CSI report by including, in the CSI parameter set, an indication for indicating the number of non-zero LC coefficients in the first portion of the target CSI report N U .
  • the first device 110 may define a new indicator for indicating the number of non-zero LC coefficients in the first portion of the target CSI report N U in the CSI parameter set, and the value of should be no more than
  • at least the strongest coefficient exists in each layer for CSI report N U so if the first portion of the target CSI report with priority 2N U -1 should also be omitted. Therefore, the value is ranged from and has the corresponding quantization bit for its feedback, such as bits.
  • the first device 110 may utilize the CSI parameter set to indicate at least the payload of the first portion of the target CSI report by moving a bitmap from the target CSI report N U to the CSI parameter set.
  • the bitmap indicates locations and the number of non-zero LC coefficients in the first portion of the target CSI report.
  • the first device 110 may utilize the CSI parameter set to indicate at least the payload of the first portion of the target CSI report N U by moving to CSI parameter set, bitmaps from the first portions of N REP CSI reports.
  • the bitmaps indicates respective locations and numbers of non-zero linear combination coefficients in the first portions of the plurality of CSI reports.
  • the first device 110 may utilize the indicator of non-zero coefficients K NZ, n for each CSI report included in the CSI part 1 to indicate CSI omission related information.
  • FIG. 4 illustrates a flowchart of a method 400 implemented at a second device according to some other embodiments of the present disclosure.
  • the method 400 can be implemented by the second device 120 as shown in FIG. 1.
  • the process 400 will be described with reference to FIG. 1.
  • the second device 120 determines a subset of a plurality of CSI reports, based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports and the size of resource allocated on PUSCH for reporting CSI.
  • the second device may obtain the payload size of each of the plurality of CSI report from the CSI part 1 transmitted from the first device 110.
  • the second device may determine a subset of CSI reports to be entirely received based on their respective priorities and payloads as well as the size of resource.
  • the second device 120 receives the CSI parameter set and the subset of CSI reports from the first device 110.
  • the CSI parameter set with the highest priority indicates a payload of the first portion of the target CSI report N U which follows the subset of the CSI reports.
  • the second device 120 determines whether to receive the target CSI report N U following the subset of CSI reports.
  • the target CSI report N U is divided into a first portion and a second portion, and the second portion is to be omitted in the reporting of the CSI.
  • the second device 120 may determines whether to receive the target CSI report following the subset of CSI reports N U by determining whether the payload of the first portion of the target CSI report N U is less than or equal to a difference between the size of the resource and a payload of the subset of CSI reports. If the payload of the first portion of the target CSI report N U is less than or equal to the difference, then the second device 120 may determine that the target CSI report N U is to be received. Otherwise, the second device 120 may determine that the target CSI report N U is to be omitted.
  • the second device 120 receives the first portion of the target CSI report, at 440.
  • the second device 120 may determine the payload of the first portion of the target CSI report N U from an indication included in the CSI parameter set.
  • the indication is defined in CSI parameter set for indicating the number of non-zero LC coefficients in the first portion of the target CSI report N U .
  • the second device 120 may obtain the payload of the first portion of the target CSI report N U .
  • the second device 120 may determine the payload of the first portion of the target CSI report N U from a bitmap included in the CSI parameter set. As discussed with regard to FIG. 3, the bitmap is moved from the target CSI report N U to the CSI parameter set and indicates locations and the number of non-zero LC coefficients in the first portion of the target CSI report N U . Thus, with the number of non-zero LC coefficients in the first portion of the target CSI report N U , the second device 120 may obtain the payload of the first portion of the target CSI report N U .
  • the second device 120 may determine the payload of the first portion of the target CSI report N U from bitmaps included in the CSI parameter set. As discussed with regard to FIG. 3, the bitmaps are moved from the first portions of the plurality of CSI reports to the CSI parameter set and indicate respective locations and numbers of non-zero linear combination coefficients in the first portions of the plurality of CSI reports. Thus, with the number of non-zero LC coefficients in the first portion of the target CSI report N U , the second device 120 may obtain the payload of the first portion of the target CSI report N U .
  • an apparatus capable of performing any of the method 300 may comprise means for performing the respective steps of the method 300.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for in response to a determination that a payload of CSI to be transmitted in a slot exceeds a size of resource allocated for reporting the CSI to the first device, determining, from a plurality of CSI reports, a subset of CSI reports preceding a target CSI report based on the payload and the size of the resource, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI; means for determining a payload of the first portion of the target CSI report; and means for transmitting at least a CSI parameter set of the plurality of CSI reports and the subset of the CSI reports to a second device, the CSI parameter set indicating at least the payload of the first portion of the target CSI report.
  • the apparatus further comprises means for performing other steps in some embodiments of the method 300.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • the apparatus further comprises means for obtaining the plurality of CSI reports with respective priorities; and means for determining the subset of CSI reports from the plurality of the CSI reports in descending order of the priorities, such that a payload of the subset of CSI reports matches the size of resource.
  • the apparatus further comprises means for in response to the payload of the first portion of the target CSI report is less than or equal to a difference between the size of the resource and the payload of the subset of CSI reports, transmitting the first portion of the target CSI report after the subset of CSI reports.
  • the apparatus further comprises means for including, in the CSI parameter set, an indication indicating the number of non-zero linear combination coefficients in the first portion of the target CSI report.
  • the apparatus further comprises means for moving a bitmap from the target CSI report to CSI parameter set, the bitmap indicating locations and the number of non-zero linear combination coefficients in the first portion of the target CSI report.
  • the apparatus further comprises means for dividing each of the plurality of CSI reports into a first portion and a second portion; and means for moving, to the CSI parameter set, bitmaps from the first portions of the plurality of CSI reports, the bitmaps indicating respective locations and numbers of non-zero linear combination coefficients in the first portions of the plurality of CSI reports.
  • the apparatus further comprises means for determining polarization of a matrix in a CSI report in a spatial domain, the matrix comprising a set of linear combination coefficients for quantizing a channel between the first device and the second device, the matrix having spatial components and frequency components, and a polarization having a half of spatial components; and means for determining the first portion and the second portion of the CSI report based on the polarization.
  • the apparatus further comprises means for determining, as the first portion, even indices of frequency components of a matrix in a CSI report, the matrix comprising a set of non-zero linear combination coefficients for quantizing a channel between the first device and the second device, the matrix having spatial components and frequency components; and means for determining, as the second portion, odd indices of frequency components of a matrix in the CSI report.
  • the apparatus further comprises means for determining, as the first portion, a part of frequency components of a matrix in a CSI report, the matrix comprising a set of non-zero linear combination coefficients for quantizing a channel between the first device and a second device, the matrix having spatial components and frequency components, the part of frequency components including the first frequency component of the matrix; and determining, as the second portion, the other half of the frequency components of the matrix.
  • an apparatus capable of performing any of the method 400 may comprise means for performing the respective steps of the method 400.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises: means for determining a subset of a plurality of channel state information (CSI) reports based on payloads of the plurality of CSI reports, a CSI parameter set of the plurality of CSI reports and a size of resource allocated for reporting CSI; means for receiving, from a first device, the CSI parameter set and the subset of CSI reports; means for determining, based on the CSI parameter set and the size of the resource, whether to receive a target CSI report following the subset of CSI reports, the target CSI report comprising a first portion and a second portion, the second portion being to be omitted in the reporting of the CSI, the CSI parameter set indicating at least a payload of the first portion of the target CSI report; and means for in response to a determination that the target CSI report is to be received, receiving the first portion of the target CSI report.
  • CSI channel state information
  • the apparatus further comprises means for performing other steps in some embodiments of the method 400.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • the apparatus further comprises means for determining whether the payload of the first portion of the target CSI report is less than or equal to a difference between the size of the resource and a payload of the subset of CSI reports; and in response to a determination that the payload of the first portion of the target CSI report is less than or equal to the difference, determining that the target CSI report is to be received.
  • the apparatus further comprises means for determining the payload of the first portion of the target CSI report from an indication included in the CSI parameter set, the indication indicating the number of non-zero linear combination coefficients in the first portion of the target CSI report.
  • the apparatus further comprises means for determining the payload of the first portion of the target CSI report from a bitmap included in the CSI parameter set, the bitmap being moved from the target CSI report to the CSI parameter set and indicating locations and the number of non-zero linear combination coefficients in the first portion of the target CSI report.
  • the apparatus further comprises means for determining the payload of the first portion of the target CSI report from bitmaps included in the CSI parameter set , the bitmaps being moved from the first portions of the plurality of CSI reports to the CSI parameter set and indicating respective locations and numbers of non-zero linear combination coefficients in the first portions of the plurality of CSI reports.
  • Fig. 5 is a simplified block diagram of a device 500 that is suitable for implementing embodiments of the present disclosure.
  • the device 500 may be provided to implement the communication device, for example the first device 110 or the second device 120 as shown in Fig. 1.
  • the device 500 includes one or more processors 510, one or more memories 520 coupled to the processor 510, and one or more communication modules 540 coupled to the processor 510.
  • the communication module 540 is for bidirectional communications.
  • the communication module 540 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 510 may be of any type suitable to the local technical network and may include one or more of the following: 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.
  • the memory 520 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 524, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 522 and other volatile memories that will not last in the power-down duration.
  • a computer program 530 includes computer executable instructions that are executed by the associated processor 510.
  • the program 530 may be stored in the ROM 524.
  • the processor 510 may perform any suitable actions and processing by loading the program 530 into the RAM 522.
  • the embodiments of the present disclosure may be implemented by means of the program 530 so that the device 500 may perform any process of the disclosure as discussed with reference to Figs. 3 and 4.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 530 may be tangibly contained in a computer readable medium which may be included in the device 500 (such as in the memory 520) or other storage devices that are accessible by the device 500.
  • the device 500 may load the program 530 from the computer readable medium to the RAM 522 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 6 shows an example of the computer readable medium 600 in form of CD or DVD.
  • the computer readable medium has the program 530 stored thereon.
  • 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 representations, it is to be understood that the block, apparatus, system, technique or method 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 method 300 or 400 as described above with reference to Figs. 3-4.
  • 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 computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer 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. More specific examples of the computer 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.

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