WO2020252691A1 - Transmission et détermination d'informations d'état de canal - Google Patents

Transmission et détermination d'informations d'état de canal Download PDF

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Publication number
WO2020252691A1
WO2020252691A1 PCT/CN2019/091890 CN2019091890W WO2020252691A1 WO 2020252691 A1 WO2020252691 A1 WO 2020252691A1 CN 2019091890 W CN2019091890 W CN 2019091890W WO 2020252691 A1 WO2020252691 A1 WO 2020252691A1
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WIPO (PCT)
Prior art keywords
csi report
information
determining
determined
csi
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PCT/CN2019/091890
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English (en)
Inventor
Hao Liu
William J. Hillery
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 CN201980097612.8A priority Critical patent/CN114008947B/zh
Priority to PCT/CN2019/091890 priority patent/WO2020252691A1/fr
Publication of WO2020252691A1 publication Critical patent/WO2020252691A1/fr

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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage media for transmission and determination of channel state information (CSI) .
  • CSI channel state information
  • Type II CSI reporting which is designed for a lower rank, such as, Rank Indication (RI) is 1 or 2) can be extended to a higher rank (such as, RI is 3 or 4) , so as to support more data streams per user equipment (UE) for Single-User Multiple-Input Multiple-Output (SU-MIMO) or Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmissions.
  • RI Rank Indication
  • UE User Equipment
  • the rank may indicate the number of independent transmission layers supported in a communication channel. Due to dependence on the number of layers added for higher rank extension, a total number of non-zero (NZ) coefficients across layers and bitmap per layer, etc., the overhead of CSI reporting has a wide dynamic range. Hence, there generally exist some discrepancies between resource allocation on physical uplink shared channel (PUSCH) by a network device and actual payload requirements for CSI reporting at a terminal device. How to handle the case when capacity of allocated resources is not enough for CSI reporting becomes a hot spot.
  • PUSCH physical uplink shared channel
  • example embodiments of the present disclosure provide a solution for transmission and determination of CSI.
  • a method comprises: determining, by a first device, a set of CSI reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; determining, from the set of CSI reports, a CSI report of which the second information is to be partially transmitted; determining a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; determining a payload size of the first portion of the determined CSI report based on the total number of non-zero coefficients; and transmitting, to the second device, the first portion of the determined CSI report based on the payload size.
  • a method comprises: receiving, by a second device and from a first device served by the second device, a data stream about a set of CSI reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be surely transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; determining, from the set of CSI reports, a CSI report of which the second information is partially transmitted; determining a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; determining a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients in the first portion; and determining, from the data stream, the first portion of the determined CSI report based on the
  • a device comprising 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 device to: determine, by a first device, a set of CSI reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; determine, from the set of CSI reports, a CSI report of which the second information is to be partially transmitted; determine a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; determine a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients
  • a device comprising 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 device to: receive, by a second device and from a first device served by the second device, a data stream about a set of channel state information (CSI) reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be surely transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; determine, from the set of CSI reports, a CSI report of which the second information is partially transmitted; determine a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; determine a payload size of the first portion of the determined CSI report
  • CSI channel state information
  • an apparatus comprising: means for determining, by a first device, a set of CSI reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; means for determining, from the set of CSI reports, a CSI report of which the second information is to be partially transmitted; means for determining a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; means for determining a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients in the first portion; and means for transmitting, to the second device, the first portion of the determined CSI report based on the payload
  • an apparatus comprising: means for receiving, by a second device and from a first device served by the second device, a data stream about a set of channel state information (CSI) reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be surely transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; means for determining, from the set of CSI reports, a CSI report of which the second information is partially transmitted; means for determining a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; means for determining a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients in the first portion; and means for determining, from the data stream, the first
  • a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the first or second aspect.
  • Fig. 1 illustrates an example communication network in which example embodiments of the present disclosure may be implemented
  • Fig. 2 illustrates a schematic diagram illustrating a process for CSI reporting according to example embodiments of the present disclosure
  • Fig. 3 illustrates a flowchart of a method implemented at a first device according to example embodiments of the present disclosure
  • Fig. 4 illustrates a flowchart of a method implemented at a second device according to example embodiments of the present disclosure
  • Fig. 5 illustrates a simplified block diagram of an apparatus that is suitable for implementing example embodiments of the present disclosure.
  • FIG. 6 illustrates a block diagram of an example computer readable medium in accordance with example 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 “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • 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 Remote Radio Unit
  • RH radio header
  • terminal device refers to any end device that may be capable of wireless communication.
  • 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 (loT) 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/
  • Type II CSI reporting can be extended to a higher rank so as to support more data streams per UE for SU-MIMO or MU-MIMO transmissions.
  • the overhead of CSI reporting has a wide dynamic range.
  • UCI uplink control information
  • RI rank indicator
  • CQI wideband channel quality indicator
  • LC non-zero linear combination
  • the UCI part 1 is used for supporting the decoding of the UCI part 2, and has a higher priority for transmission than that of the UCI part 2. According to Release-15 omission rules, when the allocated resource is not enough to contain all the UCI part 2, CSI parameters in the UCI part 2 are partially omitted in terms of a priority order shown in Table 1.
  • N Rep is the number of CSI reports configured to be carried on the PUSCH.
  • Priority 0 is the highest priority and priority 2 N Rep is the lowest priority.
  • Subband (SB) CSI of each CSI report is divided into two separate levels including even and odd SBs.
  • Each priority level for wideband (WB) or SB CSI has a certain payload size relying on rank indicator (RI) and an indication of the number of NZ WB coefficients per layer in UCI part 1. According to codebooks employed in Release 15, the number of NZ coefficients is common to each subband in a layer.
  • the total number of NZ coefficients in even SBs of the certain CSI report is reduced to almost half for each layer, and a payload size of the even SBs still can be determined from rank indicator (RI) and an indication of the number of NZ WB coefficients per layer in UCI part 1.
  • RI rank indicator
  • Type II CSI has been compressed through a discrete Fourier transform (DFT) based operation to utilize a correlation in FD and reduce the number of meaningful coefficients required to describe a precoder matrix indicator (PMI) .
  • DFT discrete Fourier transform
  • PMI precoder matrix indicator
  • Release 15 omission rules are applied into Release 16 Type II CSI compression, the payload size of each priority level for even or odd FD basis vectors cannot be determined by a total number of NZ coefficients across layers identified in UCI part 1, since the total number of NZ coefficients across layers in even or odd FD basis vectors needs to be determined from an indication of a bitmap per layer in the UCI part 2 instead of the UCI part 1.
  • suitable omission rules should be devised for Release 16 so as to conveniently determine the payload size of a priority level and successfully perform the transmission and determination of CSI.
  • Embodiments of the present disclosure provide a solution for transmission and determination of CSI, so as to at least in part solve the above and other potential problems.
  • FIG. 1 shows an example communication network 100 in which implementations of the present disclosure can be implemented.
  • the communication network 100 includes a plurality of first devices 110-1, 110-2, ...and 110-N, which can be collectively or individually referred to as “first device (s) ” 110, and a second device 120 serving the first device 110.
  • the network 100 can provide one or more cells 102 to serve the first device 110. It is to be understood that the number of first devices, second devices and/or cells is given for the purpose of illustration without suggesting any limitations to the present disclosure.
  • the communication network 100 may include any suitable number of first devices, second devices and/or cells adapted for implementing implementations of the present disclosure.
  • the first device is a terminal device
  • the second device is a network device.
  • the first device 110 can communicate data and control information to the second device 120 and the second device 120 can also communication data and control information to 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 second device 120 may transmit a channel state information-reference signal (CSI-RS) to the first device 110.
  • the first device 110 may receive the CSI-RS from the second device 120, and obtain channel information by measuring the CSI-RS.
  • the first device 110 may then determine the CSI reports for the communication channel based on the obtained channel information and a corresponding codebook. For example, the obtained channel information can be quantized into the CSI based on the corresponding codebook.
  • the first device 110 may report the CSI to the second device 120.
  • a set of CSI parameters for a frequency band of the channel is also called as “a CSI report” .
  • the CSI reports may ensure reliability of the wireless communication between the first device 110 and the second device 120. It should be note that, embodiments of the present disclosure also apply to other suitable scenes involving a plurality of second devices. In this case, the CSI reports may correspond to reporting CSI for channels between the first device 110 and the plurality of second devices.
  • FIG. 2 shows a schematic diagram of a process 200 for CSI reporting according to 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 devices 120 as illustrated in Fig. 1.
  • the first device 110 may determine 210 a set of CSI reports for channels between the first device 110 and the second device 120.
  • the set of CSI reports may include a single CSI report.
  • the set of CSI reports may include two or more different CSI reports.
  • each CSI report may have a different priority for transmission.
  • each CSI report may comprise first information about a first set of parameters that are to be transmitted and a second information about a second set of parameters that can be selectively transmitted.
  • the first set of parameters may comprise at least one of a SD basis subset selection indicator, a SD oversampling factor, a FD basis subset selection indicator per layer, and a SCI per layer.
  • the second set of parameters may comprise at least one of a bitmap per layer and non-zero LC coefficients each comprising phase and amplitude excluding the strongest coefficient. It should be noted that, the division of the first and second set of parameters is not limited by the above example, and can be carried out in any suitable manner. In addition, the first and second set of parameters may also include any other suitable parameters well-known in the art or developed in future.
  • the second information may be divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority.
  • the second information is uniformly divided into the first and second portions on a frequency domain basis or a spatial domain basis.
  • the second information may contain a bitmap indication in a form of a two-dimensional matrix including a transformed FD and a SD for each layer.
  • the first and second portions may correspond to upper and lower halves of the matrix.
  • the first and second portions may correspond to left and right halves of the matrix.
  • the first and second portions may correspond to even and odd transformed FD basis vectors of the matrix. It should be noted that, the division of the first and second portions is not limited by the above example, and can be carried out in any suitable manner. For convenience, the following description is made with reference to the division based on even and odd transformed FD basis vectors as an example.
  • CSI parameters in the UCI part 2 may be partially omitted in terms of a priority order shown in Table 2.
  • N Rep is the number of CSI reports configured to be carried on the PUSCH in one time slot.
  • Priority 0 is the highest priority and priority 2 N Rep is the lowest priority.
  • the first and second information of each CSI report is also called as basic CSI and transformed domain CSI.
  • each CSI report has the first portion as even FD basis vectors and the second portion as odd FD basis vectors.
  • the parameters and payload sizes of basic CSI and transformed domain CSI are described in Table 3 in case of a single CSI report.
  • the first device 110 may determine 220, from the set of CSI reports, a CSI report of which the second information is to be partially transmitted. In some example embodiments, the first device 110 may determine the CSI report based on a PUSCH resource allocated for CSI reporting and payload sizes of CSI reports of respective priorities.
  • S 0 is the payload size of Priority 0 (basic CSI) for all the N Rep CSI reports
  • RI n is the number of layers for CSI report n
  • K NZ, n is the total number of NZ coefficients across layers for CSI report n
  • K NZ, even n is the total number of NZ coefficients across layers for CSI report n in even FD
  • the related payload sizes may be calculated as follows.
  • the first device 110 may determine the CSI report of which the second information is to be partially transmitted according to the equations (1) and (2) . For example, if the first device 110 may determine CSI report N U is the CSI report of which the second information is partially transmitted. In this case, omission rules may be triggered, in which Priority 0 and all the priority levels of all the CSI reports with the index less than N U are reported, while all the priority levels of all the CSI reports with the index larger than N U are omitted. For CSI report N U , its priority level, 2N U -1, with even FD basis vectors is also reported, while its priority level, 2N U , with odd FDD basis vectors is omitted.
  • the first device 110 may determine 230 a total number of NZ coefficients across layers in the first portion (in this example, even FD basis vectors in priority 2N U -1) of the determined CSI report, i.e., In some example embodiments, the payload size of Priority 2N U -1 of CSI report N U may be adjusted and adapted to the allocated PUSCH resources, RA, and can be calculated according to the following equation (4) for CSI report N U .
  • the first device 110 may determine 240 a payload size of the first portion of the determined CSI report based on the determined total number of NZ coefficients. In some example embodiments, the first device 110 may determine the payload size of the first portion of the determined CSI report N U according to the following equation (5) .
  • the first device 110 may firstly determine whether the first portion can be transmitted based on the value of the total number of NZ coefficients and then determine the payload size if the first portion can be transmitted. In some embodiments, if the total number of NZ coefficients exceeds the number of the layers involved in the determined CSI report, the first device 110 may determine that the first portion can be transmitted. If the total number of NZ coefficients is below the number of the layers involved in the determined CSI report, the first device 110 may determine that the first portion is unnecessary to be transmitted. In case of that is, only the strongest coefficient exists in each layer for CSI report N U , the transmission of Priority 2N U -1 (i.e., the first portion) should also be omitted.
  • the first device 110 may transmit 250, to the second device 120, the first portion of the determined CSI report based on the determined payload size of the first portion.
  • the first device 110 may also transmit the first information of CSI reports 1 to n and the second information of CSI reports 1 to N U -1 having priorities higher than the determined CSI report N U . Meanwhile, transmission of the second portion for the determined CSI report N U and transmission of the second information of CSI reports N U +1 to N Rep having a priority lower than the determined CSI report are omitted.
  • the first information i.e., basis CSI
  • the first device 110 may transmit, to the second device 120, the whole part 2 CSI including all the Priority levels without triggering omission rules. In some example embodiments, if RA ⁇ S 0 , then the first device 110 may transmit neither priority level of part 2 CSI.
  • the first device 110 may transmit, in a data stream, the set of CSI reports with partial omission to the second device 120.
  • the second device 120 may determine 260, from the set of CSI reports, the CSI report of which the second information is partially transmitted.
  • the second device 120 may determine the CSI report N U of which the second information is partially transmitted based on a PUSCH resource allocated for CSI reporting and payload sizes of CSI reports of respective priorities. This can be accomplished in a similar process as the process that the first device 110 determine 220 the CSI report of which the second information is to be partially transmitted, which will not be repeated herein.
  • the second device 120 may determine 270 the total number of NZ coefficients across layers in the first portion of the determined CSI report N U , i.e., In some example embodiments, can be calculated according to the above equation (4) for CSI report N U . Then, the second device 120 may determine 280 the payload size of the first portion of the determined CSI report N U based on the determined total number of non-zero coefficients In some example embodiments, the second device 120 may determine the payload size of the first portion of the determined CSI report N U according to the above equation (5) .
  • the second device 120 may determine 290, from the data stream, the first portion of the determined CSI report N U based on the payload size. In some embodiments, the second device 120 may also determine payload sizes of the first information of all the CSI reports 1 to n and that of the second information of CSI reports 1 to N U -1 having priorities higher than that of the determined CSI report N U , for example, according to the above equations (1) and (2) .
  • the above equations (1) - (5) are provided merely for illustration, and do not limit the protection scope of the present application. Any other suitable embodiments are also applicable.
  • the payload size of a priority level of CSI can be conveniently determined by the allocated PUSCH resources without need of additional UCI part 1 design and CSI can be successfully transmitted and determined.
  • FIG. 3 shows a flowchart of an example method 300 implemented at a first device such as a terminal device in accordance with some embodiments of the present disclosure.
  • a first device such as a terminal device
  • the method 300 will be described from the perspective of the first device 110 with reference to FIG. 1. It is to be understood that method 300 may further include additional blocks not shown and/or omit some shown blocks, and the scope of the present disclosure is not limited in this regard.
  • the first device 110 may determine a set of CSI reports for a channel between the first device 110 and a second device 120.
  • Each CSI report has a different priority for transmission and comprises first information about a first set of parameters that is required to be transmitted and second information about a second set of parameters that can be selectively transmitted.
  • the second information is divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority.
  • the second information is uniformly divided into the first and second portions on a frequency domain basis or a spatial domain basis.
  • the second information may contain a bitmap indication in a form of a two-dimensional matrix including a transformed FD and a SD.
  • the first and second portions may correspond to upper and lower halves of the matrix.
  • the first and second portions may correspond to left and right halves of the matrix.
  • the first and second portions may correspond to even and odd transformed FD basis vectors of the matrix. It should be note that, the division of the first and second portions is not limited by the above example, and can be carried out in any suitable manner.
  • the first set of parameters may comprise at least one of a spatial domain basis subset selection indicator, a spatial domain oversampling factor, a frequency domain basis subset selection indicator per layer, and a strongest coefficient indicator per layer.
  • the second set of parameters may comprise at least one of a bitmap per layer and non-zero linear combination coefficients each comprising a phase and an amplitude excluding the strongest coefficient. It should be note that, the division of the first and second set of parameters is not limited by the above example, and can be carried out in any suitable manner. In addition, the first and second set of parameters may also include any other suitable parameters well-known in the art or developed in future.
  • the first device 110 may determine, from the set of CSI reports, a CSI report of which the second information is to be partially transmitted.
  • the first device 110 may obtain, from the second device 120, a resource (e.g., RA) allocated for the set of CSI reports, for example, via a radio resource control (RRC) signaling.
  • the first device 110 may determine a sum of payload sizes of the first information for the set of CSI reports as a first value (e.g., S 0 ) .
  • the first device 110 may determine S 0 according to the above equation (1) .
  • the first device 110 may determine payload sizes of the second information for each of the set of CSI reports as a plurality of second values (e.g., S n ) . For example, the first device 110 may determine S n according to the above equation (2) . Then, the first device 110 may determine the CSI report (e.g., CSI report N U ) based on a size of the resource, the first value, the plurality of second values and priority for each of the set of CSI reports.
  • the CSI report e.g., CSI report N U
  • the first device 110 may determine a total number of non-zero coefficients (e.g., ) across layers of the channel in the first portion of the determined CSI report.
  • the first device 110 may obtain, from the second device 120, a resource (e.g., RA) allocated for the set of CSI reports and determine a sum of payload sizes of the first information for the set of CSI reports as a first value (e.g., S 0 ) .
  • the first device 110 may determine a sum of payload sizes of the second information for CSI reports having priorities higher than the determined CSI report as a third value (e.g., ) .
  • the first device 110 may determine the number of the layers (e.g., ) of the channel involved in the determined CSI report.
  • the first device 110 may determine a total number of non-zero coefficients (e.g., ) across the layers in the determined CSI report.
  • the first device 110 may determine the total number of non-zero coefficients (e.g., ) in the first portion based on a size of the resource, the first value, the third value, the number of the layers and the total number of non-zero coefficients across the layers for the determined CSI report.
  • the first device 110 may determine according to the above equation (4) .
  • the first device 110 may determine a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients in the first portion. In some example embodiments, the first device 110 may determine the payload size of the first portion of the determined CSI report according to the above equation (5) .
  • the first device 110 may determine whether the first portion can be transmitted based on the total number of non-zero coefficients in the first portion and the number of the layers of the channel involved in the determined CSI report, and in response to a determination that the first portion can be transmitted, the first device 110 may determine the payload size. In some example embodiments, the first device 110 may determine whether the total number of non-zero coefficients in the first portion exceeds the number of the layers of the channel involved in the determined CSI report, and in response to the total number of non-zero coefficients in the first portion exceeding the number of the layers of the channel involved in the determined CSI report, the first device 110 may determine that the first portion can be transmitted. If the total number of NZ coefficients in the first portion is below or equals to the number of the layers involved in the determined CSI report, the first device 110 may determine that the first portion is unnecessary to be transmitted. In this way, efficiency for CSI transmission can be enhanced.
  • the first device 110 may transmit, to the second device 120, the first portion of the determined CSI report based on the payload size.
  • the first device 110 may also transmit, to the second device 120, the first information of the set of CSI reports and the second information of CSI reports having priorities higher than the determined CSI report. In the meanwhile, transmission of the second portion for the determined CSI report and transmission of the second information of CSI reports having a priority lower than the determined CSI report are omitted.
  • the first device 110 may also transmit, to the second device 120, the first information about all the CSI reports in highest priority for transmission.
  • the payload size of a priority level can be conveniently determined by the allocated PUSCH resources without need of additional UCI part 1 design, and thus CSI transmission is conveniently and properly achieved.
  • FIG. 4 shows a flowchart of an example method 400 implemented at a second device such as a network device in accordance with some embodiments of the present disclosure.
  • a second device such as a network device
  • the method 400 will be described from the perspective of the second device 120 with reference to FIG. 1. It is to be understood that method 400 may further include additional blocks not shown and/or omit some shown blocks, and the scope of the present disclosure is not limited in this regard.
  • the second device 120 may receive, from the first device 110, a data stream about a set of CSI reports for a channel between the second device 120 and the first device 110.
  • Each CSI report has a different priority for transmission and comprises first information about a first set of parameters that is required to be transmitted and second information about a second set of parameters that can be selectively transmitted.
  • the second information is divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority.
  • the second information is uniformly divided into the first and second portions on a frequency domain basis or a spatial domain basis.
  • the second information may contain a bitmap indication in a form of a two-dimensional matrix including a transformed FD and a SD.
  • the first and second portions may correspond to upper and lower halves of the matrix.
  • the first and second portions may correspond to left and right halves of the matrix.
  • the first and second portions may correspond to even and odd transformed FD basis vectors of the matrix. It should be note that, the division of the first and second portions is not limited by the above example, and can be carried out in any suitable manner.
  • the first set of parameters may comprise at least one of a spatial domain basis subset selection indicator, a spatial domain oversampling factor, a frequency domain basis subset selection indicator per layer, and a strongest coefficient indicator per layer.
  • the second set of parameters may comprise at least one of a bitmap per layer and non-zero linear combination coefficients each comprising a phase and an amplitude excluding the strongest coefficient. It should be note that, the division of the first and second set of parameters is not limited by the above example, and can be carried out in any suitable manner. In addition, the first and second set of parameters may also include any other suitable parameters well-known in the art or developed in future.
  • the second device 120 may determine, from the set of CSI reports, a CSI report of which the second information is partially transmitted.
  • the second device 120 may determine a sum of payload sizes of the first information for the set of CSI reports as a first value (e.g., S 0 ) .
  • the second device 120 may determine S 0 according to the above equation (1) .
  • the second device 120 may determine payload sizes of the second information for each of the set of CSI reports as a plurality of second values (e.g., S n ) .
  • the second device 120 may determine S n according to the above equation (2) .
  • the second device 120 may determine the CSI report (e.g., CSI report N U ) based on a size of a resource allocated for CSI reporting, the first value, the plurality of second values and priority for each of the set of CSI reports.
  • the CSI report e.g., CSI report N U
  • the second device 120 may determine a total number of non-zero coefficients (e.g., ) across layers of the channel in the first portion of the determined CSI report.
  • the second device 120 may determine a sum of payload sizes of the first information for the set of CSI reports as a first value (e.g., S 0 ) .
  • the second device 120 may determine a sum of payload sizes of the second information for CSI reports having priorities higher than the determined CSI report as a third value (e.g., ) .
  • the second device 120 may determine the number of the layers (e.g., ) of the channel involved in the determined CSI report.
  • the second device 120 may determine a total number of non-zero coefficients (e.g., ) across the layers in the determined CSI report.
  • the second device 120 may determine the total number of non-zero coefficients (e.g., ) in the first portion based on a size of a resource allocated for CSI reporting, the first value, the third value, the number of the layers and the total number of non-zero coefficients across the layers for the determined CSI report.
  • the second device 120 may determine according to the above equation (4) .
  • the second device 120 may determine a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients in the first portion. In some example embodiments, the second device 120 may determine the payload size of the first portion of the determined CSI report according to the above equation (5) .
  • the second device 120 may determine whether the first portion is transmitted based on the total number of non-zero coefficients in the first portion and the number of the layers of the channel involved in the determined CSI report, and in response to a determination that the first portion is transmitted, the second device 120 may determine the payload size. In some example embodiments, the second device 120 may determine whether the total number of non-zero coefficients exceeds the number of the layers of the channel involved in the determined CSI report, and in response to the total number of non-zero coefficients exceeding the number of the layers of the channel involved in the determined CSI report, the second device 120 may determine that the first portion is transmitted. If the total number of NZ coefficients in the first portion is below or equals to the number of the layers involved in the determined CSI report, the second device 120 may determine that the first portion is not transmitted.
  • the second device 120 may determine, from the data stream, the first portion of the determined CSI report based on the payload size. In some example embodiments, the second device 120 may also determine, from the data stream, the first information of the set of CSI reports and the second information of CSI reports having priorities higher than the determined CSI report. In the meanwhile, transmission of the second portion for the determined CSI report and transmission of the second information of CSI reports having a priority lower than the determined CSI report are omitted. In some example embodiments, the second device 120 may also determine, from the data stream, the first information about all the CSI reports in highest priority for transmission.
  • the payload size of a priority level can be conveniently determined by the allocated PUSCH resources without need of additional UCI part 1 design, and thus CSI can be conveniently and correctly determined.
  • the apparatus comprises: means for determining, by a first device, a set of channel state information (CSI) reports for a channel between the first device and a second device serving the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; means for determining, from the set of CSI reports, a CSI report of which the second information is to be partially transmitted; means for determining a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; means for determining a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients in the first portion; and means for transmitting, to the second device, the first portion of the determined CSI report based on the payload size
  • CSI
  • 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.
  • an apparatus capable of performing 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 receiving, by a second device and from a first device served by the second device, a data stream about a set of channel state information (CSI) reports for a channel between the second device and the first device, each CSI report having a different priority for transmission and comprising first information about a first set of parameters that is required to be surely transmitted and second information about a second set of parameters that can be selectively transmitted, the second information being divided into a first portion having a first priority for transmission and a second portion having a second priority for transmission lower than the first priority; means for determining, from the set of CSI reports, a CSI report of which the second information is partially transmitted; means for determining a total number of non-zero coefficients across layers of the channel in the first portion of the determined CSI report; means for determining a payload size of the first portion of the determined CSI report based on the determined total number of non-zero coefficients in the first portion; and means for determining, from the data stream, the first portion of the determined CSI reports for
  • 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.
  • 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 (such as, transmitters and/or receivers) 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. 2 to 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 as described above with reference to FIG. 3 and/or the method 400 as described above with reference to FIG. 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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Abstract

Selon des modes de réalisation, l'invention concerne des procédés, dispositifs, appareils et supports lisibles par ordinateur permettant la transmission et détermination d'informations d'état de canal (CSI). Un premier dispositif détermine un ensemble de rapports CSI pour un canal entre le premier dispositif et un second dispositif desservant le premier dispositif, chaque rapport CSI ayant une priorité différente de transmission et comprenant de premières informations concernant un premier ensemble de paramètres dont la transmission est requise et de secondes informations concernant un second ensemble de paramètres qui peuvent être sélectivement transmis, les secondes informations étant divisées en un premier élément ayant une première priorité de transmission et un second élément ayant une seconde priorité de transmission inférieure à la première priorité. Le premier dispositif détermine, à partir de l'ensemble de rapports CSI, un rapport CSI dont les secondes informations doivent être partiellement transmises ; détermine un nombre total de coefficients non nuls sur des couches du canal dans le premier élément du rapport CSI déterminé ; détermine une taille de charge utile du premier élément du rapport CSI déterminé sur la base du nombre total déterminé de coefficients non nuls dans le premier élément ; et transmet, au second dispositif, le premier élément du rapport CSI déterminé sur la base de la taille de charge utile. Le second dispositif reçoit un flux de données concernant l'ensemble de rapports de CSI en provenance du premier dispositif et détermine le premier élément à partir du flux de données d'une manière similaire. Ainsi, une taille de charge utile d'un niveau de priorité de CSI peut être déterminée de manière commode par les ressources attribuées sans que la conception d'une partie 1 d'UCI supplémentaires soit requise et la transmission et détermination des CSI peut aboutir.
PCT/CN2019/091890 2019-06-19 2019-06-19 Transmission et détermination d'informations d'état de canal WO2020252691A1 (fr)

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