WO2022077463A1 - Indication de composants de domaine fréquentiel - Google Patents

Indication de composants de domaine fréquentiel Download PDF

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Publication number
WO2022077463A1
WO2022077463A1 PCT/CN2020/121583 CN2020121583W WO2022077463A1 WO 2022077463 A1 WO2022077463 A1 WO 2022077463A1 CN 2020121583 W CN2020121583 W CN 2020121583W WO 2022077463 A1 WO2022077463 A1 WO 2022077463A1
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WIPO (PCT)
Prior art keywords
codebook
resource blocks
physical resource
information
determining
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PCT/CN2020/121583
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English (en)
Inventor
Hao Liu
Filippo Tosato
Rana Ahmed
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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Publication date
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 PCT/CN2020/121583 priority Critical patent/WO2022077463A1/fr
Priority to CN202080106309.2A priority patent/CN116325614A/zh
Priority to EP20957241.1A priority patent/EP4229766A1/fr
Publication of WO2022077463A1 publication Critical patent/WO2022077463A1/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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to a method, device and computer readable storage medium of communication for indicating frequency domain (FD) components.
  • FD frequency domain
  • NR new radio
  • MIMO multi-input multi-output
  • DL downlink
  • UL uplink
  • the network device may estimate UL SRSs to acquire delay related information, such as FD components, which may be the same as selection at the terminal device through DL channel state information reference signals (CSI-RSs) .
  • CSI-RSs channel state information reference signals
  • the selection of FD components may be possibly unaligned for the network device and the terminal device sides due to larger frequency duplex distance or limited UL SRS resources or SRS estimation error, etc.. In this case, CSI quantization accuracy and system performance will be affected. Thus, how to ensure alignment for the selected FD components between the network device and terminal device sides has become a hot issue.
  • example embodiments of the present disclosure provide a solution for indicating FD components.
  • a first device comprises: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the first device to: in response to receiving a first plurality of reference signals from a second device on physical resource blocks in a subband, determine first information as to whether a frequency domain component associated with the subband is selected for at least one data stream; determine at least one codebook for the first information based on a first configuration, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks; and transmit a subset of a second plurality of reference signals with the at least one codebook to the second device on a part of the physical resource blocks, the part of the physical resource blocks determined from a second configuration indicating whether the at least one codebook is to be carried for the physical resource blocks.
  • a second device comprises: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code are configured to, with the at least one processor, cause the second device to: receive a second plurality of reference signals from a first device on physical resource blocks in a subband; determine, based on first and second configurations, first information as to whether a frequency domain component associated with the subband is selected for at least one data stream, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks, and the second configuration indicating whether the at least one codebook is to be carried for the physical resource blocks; and transmit channel state information to the first device based on the first information.
  • a method of communication comprises: in response to receiving a first plurality of reference signals from a second device on physical resource blocks in a subband, determining, at a first device, first information as to whether a frequency domain component associated with the subband is selected for at least one data stream; determining at least one codebook for the first information based on a first configuration, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks; and transmitting a subset of a second plurality of reference signals with the at least one codebook to the second device on a part of the physical resource blocks, the part of the physical resource blocks determined from a second configuration indicating whether the at least one codebook is to be carried for the physical resource blocks.
  • a method of communication comprises: receiving, at a second device, a second plurality of reference signals from a first device on physical resource blocks in a subband; determining, based on first and second configurations, first information as to whether a frequency domain component associated with the subband is selected for at least one data stream, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks, and the second configuration indicating whether the at least one codebook is to be carried for the physical resource blocks; and transmitting channel state information to the first device based on the first information.
  • an apparatus of communication comprises: means for in response to receiving a first plurality of reference signals from a second device on physical resource blocks in a subband, determining, at a first device, first information as to whether a frequency domain component associated with the subband is selected for at least one data stream; means for determining at least one codebook for the first information based on a first configuration, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks; and means for transmitting a subset of a second plurality of reference signals with the at least one codebook to the second device on a part of the physical resource blocks, the part of the physical resource blocks determined from a second configuration indicating whether the at least one codebook is to be carried for the physical resource blocks.
  • an apparatus of communication comprises: means for receiving, at a first device, a second plurality of reference signals from a first device on physical resource blocks in a subband; means for determining, based on first and second configurations, first information as to whether a frequency domain component associated with the subband is selected for at least one data stream, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks, and the second configuration indicating whether the at least one codebook is to be carried for the physical resource blocks; and means for transmitting channel state information to the first device based on the first information.
  • a non-transitory computer readable medium comprises program instructions for causing an apparatus to perform the method according to the third aspect.
  • non-transitory computer readable medium comprises program instructions for causing an apparatus to perform the method according to the fourth aspect.
  • Fig. 1 illustrates an example communication network in which example embodiments of the present disclosure may be implemented
  • Fig. 2 illustrates a diagram of RS transmission on physical resource blocks (PRBs) in subbands (SBs) according to some embodiments of the present disclosure
  • Fig. 3 illustrates a flowchart illustrating a process of communication according to some embodiments of the present disclosure
  • Fig. 4 illustrates a diagram of an example bit string configuration according to some embodiments of the present disclosure
  • Fig. 5 illustrates a diagram of an example bit string configuration according to some embodiments of the present disclosure
  • Fig. 6 illustrates a diagram of an example bit string configuration according to some embodiments of the present disclosure
  • Fig. 7 illustrates a diagram of an example bit string configuration according to some embodiments of the present disclosure
  • Fig. 8 illustrates a diagram of an example bit string configuration according to some embodiments of the present disclosure
  • Fig. 9 illustrates a diagram of an example bit string configuration according to some embodiments of the present disclosure.
  • Fig. 10 illustrates a diagram of transmission of codebooks over beamformed CSI-RS according to some embodiments of the present disclosure
  • Fig. 11 illustrates a flowchart of a method of communication implemented at a first device according to example embodiments of the present disclosure
  • Fig. 12 illustrates a flowchart of a method of communication implemented at a second device according to example embodiments of the present disclosure
  • Fig. 13 illustrates a simplified block diagram of an apparatus that is suitable for implementing example embodiments of the present disclosure.
  • Fig. 14 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 fifth generation (5G) systems, 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.
  • 5G fifth generation
  • 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 fifth generation (5G) new radio (NR) 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 fifth generation (5G) new radio (NR) 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 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
  • a RAN split architecture comprises a gNB-CU (Centralized unit, hosting RRC, SDAP and PDCP) controlling a plurality of gNB-DUs (Distributed unit, hosting RLC, MAC and PHY) .
  • a relay node may correspond to DU part of the IAB node.
  • 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/
  • the terminal device may also correspond to Mobile Termination (MT) part of the integrated access and backhaul (IAB) node (a.k.a. a relay node) .
  • MT Mobile Termination
  • IAB integrated access and backhaul
  • the terms “terminal device” , “communication device” , “terminal” , “user equipment” and “UE” may be used interchangeably.
  • partial channel reciprocity In a frequency division duplexing (FDD) system, full UL/DL channel reciprocity cannot be assumed due to duplexing distance between UL and DL channels.
  • partial channel reciprocity may be limited to the angles of departure (AoD) or arrival (AoA) and the delays of the propagation multipath.
  • the network device estimates UL SRSs to acquire delay related information, such as FD components, which may be the same as selection of the terminal device through DL CSI-RS. Therefore, the terminal device does not need to report the indices of the selected FD components to save the payload.
  • the selection of FD components may not be aligned for the network device and terminal device sides due to larger frequency duplex distance or limited UL SRS resources or SRS estimation error, etc., which has the influence on CSI quantization accuracy and system performance.
  • how to make a consistent selection of FD components for the network device and the terminal device may be a challenge.
  • the selected FD components are usually fluctuated over time, so the network device needs to promptly inform the terminal device of reciprocity based quantities in full or in part.
  • the dynamic indication may be delivered by some ways such as media access control-control element (MAC-CE) or downlink control information (DCI) signaling.
  • MAC-CE media access control-control element
  • DCI downlink control information
  • embodiments of the present disclosure provide an improved solution.
  • RS resources are utilized to convey and indicate the selected FD components.
  • a low overhead solution to dynamically indicate FD component selection can be provided.
  • Fig. 1 illustrates an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the network 100 includes a first device 110 and a second device 120 served by the first device 110. It is to be understood that the number of first and second devices as shown in Fig. 1 is only for the purpose of illustration without suggesting any limitations.
  • the network 100 may include any suitable number of first and second devices adapted for implementing embodiments of the present disclosure.
  • the first device 110 may be a network device
  • the second device 120 may be a terminal device.
  • the first device 110 is a network device and the second device 120 is a terminal device. It is to be understood that, in other embodiments, the first device 110 may be a terminal device and the second device 120 may be a network device. In other words, the principles and spirits of the present disclosure can be applied to both uplink and downlink transmissions.
  • the first device 110 and the second device 120 may communicate with each other.
  • the first device 110 may have multiple antennas for communication with the second device 120.
  • the second device 120 may also have multiple antennas for communication with the first device 110. It is to be understood that each of the first device 110 and the second device 120 may provide any suitable number of antennas adapted for implementing embodiments of the present disclosure.
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, LTE, LTE-evolution, LTE-advanced (LTE-A) , wideband code division multiple access (WCDMA) , code division multiple access (CDMA) and global system for mobile communications (GSM) and the like.
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols.
  • the first device 110 may receive SRSs from the second device 120 on PRBs in SBs, and transmit CSI-RSs to the second device 120 on the PRBs.
  • Fig. 2 illustrates a diagram of RS transmission on PRBs in SBs according to some embodiments of the present disclosure. As shown in Fig. 2, assuming that there are N3 SBs denoted as SB 0 to SB N3-1, and each SB comprises M0 PRBs denoted as PRB 1 to PRB M0.
  • N3 and M0 may be any suitable integer.
  • Embodiments of the present disclosure provide a codebook design and mapping method through beamformed RS resources to indicate to the second device 120 the exact FD components selected by the first device 110 for at least one data stream (also referred to as at least one layer herein) .
  • each SB may be represented as an index of a different FD component assumed totally N3 orthogonal FD components without oversampling, where N3 is the number of SBs.
  • one or more codebooks may be conveyed on one or more PRBs to indicate whether the FD component indexed by the SB number is selected for the at least one layer. Assuming rank indicator (RI) has longer feedback period than the other CSI items, so the first device 110 has the same knowledge of layer number as the second device 120 side.
  • RI rank indicator
  • Fig. 3 illustrates a flowchart illustrating a process 300 of communication according to some embodiments of the present disclosure.
  • Fig. 3 will be described in connection with the example of Figs. 1 and 2.
  • the process 300 can be performed for each SB, and thus will be described in taking one SB as an example.
  • the first device 110 may generate 301 a configuration (also referred to as a first configuration herein) indicating a mapping between one or more candidate contents of FD component information (also referred to as first information herein) and one or more respective codebooks.
  • the first information indicates whether a FD component associated with a SB (for example SB 0 to N3-1 in Fig. 2) is selected for at least one data stream.
  • the first configuration may be in the form of Table 1 below.
  • RI values may represent the number of layers or data streams
  • P may represent the number of beamformed CSI-RS ports
  • candidate contents of first information may include 0 and 1, and the respective codebooks may be V 1 (: , 1) and V 1 (: , 2) .
  • V 1 may represent that the FD component associated with the SB is not selected for the data stream
  • V 1 may represent that the FD component associated with the SB is selected for the data stream.
  • the first device 110 may also generate 301 a configuration (also referred to as a second configuration) indicating whether a codebook is to be carried for each of the PRBs.
  • the second configuration may be in a form of a bit string.
  • the bit string is to indicate codebook configuration location over RS resources in all the PRBs of a SB assuming all the SBs of the whole bandwidth have the same configuration.
  • the bit string is merely an example, and any other suitable ways are also feasible for the second configuration.
  • the second configuration may be generated in various mapping forms. This will be described in details with reference to Figs. 4-10.
  • multiple codebooks may be conveyed over multiple PRBs to indicate a FD component selected for at least one layer.
  • Fig. 4 illustrates a diagram of an example bit string configuration 400 according to some embodiments of the present disclosure. As shown in Fig. 4, “1” may be denoted by a codebook to indicate whether the FD component is selected for the first layer, “2” may be denoted by a codebook to indicate whether the FD component is selected for the second layer, and “0” may means no configuration of a codebook. Naturally, if the bit string is used to indicate more layers, e.g. up to 4 layers, then each block of Fig.
  • the 4 may contain 3 bits (also referred to as a sequence herein) to indicate no configuration, the first layer, the second layer, the third layer or the fourth layer.
  • the total length of the bit string is 3M0, where M0 is the number of continuous PRBs within a SB.
  • a codebook may be configured over multiple beamformed CSI-RS ports within a PRB, and its length may be the number of beamformed CSI-RS ports, P.
  • codebooks V 1 (: , 1) and V 1 (: , 2) may be formed by 2 out of P orthogonal DFT vectors, one denoting an FD component selected for a layer (e.g. V 1 (: , 1) ) , while the other denoting an FD component not selected for a layer (e.g. V 1 (: , 2) ) .
  • Each codebook has the dimension of P ⁇ 1.
  • a single codebook may be conveyed over one PRB to indicate a FD component selected for at least one layer.
  • Fig. 5 illustrates a diagram of an example bit string configuration 500 according to some embodiments of the present disclosure. As shown in Fig. 5, “1” may be denoted by a codebook to indicate whether the FD component is selected for the at least one layer, and “0” may means no configuration of a codebook. In this case, the total length of the bit string is M0, where M0 is the number of continuous PRBs within a SB.
  • V 3 (: , 1) denotes the FD component not selected for all 3 layers
  • V 3 (: , 4) denotes the FD component not selected for the first layer while selected for the other 2 layers.
  • Codebook may be formed by DFT vectors with dimension of P ⁇ P or their oversampling or undersampling version.
  • the bit string configurations in Figs. 4 and 5 may be used in combination.
  • the first information can be distributed over several PRBs.
  • Each PRB carries the first information for a subset of the layers.
  • PRB 0 carry the mapping information for layers 1 and 2
  • PRB#n carries the mapping information for layers 3 and 4.
  • This approach will have the advantages of better robustness against pilot contamination effects because the first information is distributed over several PRBs and can effectively reduce the number of entries in Table 1, hence can reduce complexity needed for finding the sequence at the second device side.
  • bit string may be repeated over PRBs.
  • bit string may be repeated over neighbouring PRBs.
  • Fig. 6 illustrates a diagram of an example bit string configuration 600 according to some embodiments of the present disclosure.
  • Fig. 7 illustrates a diagram of an example bit string configuration 700 according to some embodiments of the present disclosure.
  • bit string as shown in Fig. 5 it may be repeated as shown in Fig. 7.
  • bit string may be repeated over non-neighbouring PRBs.
  • Fig. 8 illustrates a diagram of an example bit string configuration 800 according to some embodiments of the present disclosure. For example, for the bit string as shown in Fig. 4, it may be repeated as shown in Fig. 8.
  • Fig. 9 illustrates a diagram of an example bit string configuration 900 according to some embodiments of the present disclosure. For example, for the bit string as shown in Fig. 5, it may be repeated as shown in Fig. 9.
  • some similarities may be observed among the FD components of neighbouring layers, in such case this property may be exploited where one sequence can be mapped to M 5 ⁇ 1 layers.
  • the FD component corresponding to the SB index will be active among all the mapped layers.
  • layer grouping For example, for the bit string as shown in Fig. 4, assuming that sequence 1 is mapped to layer 1 and 2 and sequence 2 is mapped to layers 3 and 4 in 2 PRBs respectively.
  • the advantage here is that only 2 entries in Table 1 were used to indicate the first information needed for 2 layers for each PRB instead of 4 entries.
  • the proposed layer grouping is different from the combination of the bit string configurations in Figs. 4 and 5 as mentioned above. In the proposed layer grouping, assuming that several layers are going to have the same FD basis subset W f . However, in the above-mentioned combination of the bit string configurations in Figs. 4 and 5, no such approximation assumption was made.
  • mapping forms as shown in Figs. 4-10 are merely examples, and the second configuration may also be generated in any other suitable mapping forms. Further, it is to be understood that the design of codebooks in the first configuration may be associated with the mapping form of the second configuration.
  • the first device 110 may transmit 302 the first and second configurations to the second device 120.
  • the first device 110 may transmit the first and second configurations in a higher layer signaling such as RRC signaling.
  • RRC signaling a higher layer signaling
  • the first and second configurations may be transmitted in the same signaling.
  • the first and second configurations may be transmitted in different signaling.
  • the first device 110 may also generate and transmit an indication (also referred to as a first indication herein) indicating that RSs to be transmitted by the first device 110 carry the first information.
  • the first indication may indicate RS (such as CSI-RS) operation mode conveying specific codebooks.
  • the first device 110 may also generate and transmit an indication (also referred to as a second indication herein) indicating a mapping form to be used for the second configuration.
  • an indication also referred to as a second indication herein
  • the second indication may indicate one of the bit string configurations as shown in Figs. 4-9.
  • the second device 120 transmits 303 RSs (also referred to as a first plurality of RSs herein) to the first device 110 as needed.
  • the second device 120 may transmit uplink SRSs to the first device 110.
  • any other suitable RSs are also feasible.
  • a single codebook may be designed for the at least one data stream.
  • the first device 110 may determine the single codebook from the codebooks in the first configuration.
  • multiple codebooks may be designed for the at least one data stream.
  • the at least one data stream may comprise a first set of data streams and a second set of data streams.
  • the first set of data streams may comprise one or more data streams
  • the second set of data streams may comprise one or more another data streams.
  • the first configuration may comprise a first set of codebooks for the first set of data streams and a second set of codebooks for the second set of data streams.
  • the first set of codebooks may comprise one or more sets of codebooks for the one or more respective data streams.
  • the first set of codebooks may comprise only one set of codebooks for the one or more respective data streams, for example, in case of layer grouping.
  • the first device 110 may determine the two codebooks from the first and second set of codebooks in the first configuration.
  • the first device 110 Upon determination of the at least one codebook, the first device 110 transmits 306 RSs (also referred to as a second plurality of RSs herein) with the at least one codebook to the second device 120. For example, the first device 110 may transmit CSI-RSs to the second device 120. Of course, any other suitable RSs are also feasible. In some embodiments, the first device 110 may determine, based on the second configuration, a part of PRBs in a SB on which the at least one codebook is to be carried. Accordingly, the first device 110 may transmit a subset of the second plurality of RSs on the part of PRBs, and transmit other RSs without codebook on other PRBs.
  • RSs also referred to as a second plurality of RSs herein
  • a single codebook may be designed for the at least one data stream.
  • the first device 110 may determine, from the second configuration, one or more PRBs (also referred to as a first set of PRBs herein) on which the single codebook is to be carried. For example, if the mapping form of the second configuration is that in Fig. 5, the first device 110 may determine one PRB (i.e., PRB 0) to carry the single codebook. As another example, if the mapping form of the second configuration is that in Fig. 7 or that in Fig. 9, the first device 110 may determine two PRBs (i.e., PRB 0 and PRB 1) to both carry the single codebook. It is to be understood that these are described for illustration and not for limitation.
  • multiple codebooks may be designed for the at least one data stream.
  • the first device 110 may determine, from the second configuration, multiple sets of PRBs on which the multiple codebooks are to be respectively carried. For example, the first device 110 may determine a set of PRBs (also referred to as a second set of PRBs herein) on which one of the multiple codebooks (also referred to as a first codebook herein) is to be carried and another set of PRBs (also referred to as a third set of PRBs herein) on which another one of the multiple codebooks is to be carried.
  • the first device 110 may determine multiple sets of PRBs (i.e., PRB 0) to carry the multiple codebooks.
  • PRB 0 the multiple codebooks may be applied in combination with layer grouping as described above. It is to be understood that these are described for illustration and not for limitation.
  • Fig. 10 illustrates a diagram 1000 of transmission of codebooks over beamformed CSI-RS according to some embodiments of the present disclosure.
  • the codebook vector is one of codebook from the first configuration, and indicates whether the i-th FD component is selected for one or more layers, depending on the mapping form of the second configuration.
  • a complete signature codebook is transmitted over all the beamformed CSI-RS ports in the first PRB of the i-th SB.
  • different codebooks may be configured in different SBs. Of course, the same design of codebooks may also be configured in different SBs.
  • the second device 120 upon receipt of the second plurality of RSs in all the PRBs in the SB, the second device 120 determines 307 the first information from the second plurality of RSs. In some embodiments, the second device 120 may determine the first information upon receipt of the first indication from the first device 110. In some embodiments, the second device 120 may determine the mapping form of the second configuration based on the second indication from the first device 110, and then determine the first information based on the first and second configurations. For example, the second device 120 may search and estimate which codebooks have been applied according to the first and second configurations.
  • a single codebook may be designed for the at least one data stream, for example, in case that the mapping form of the second configuration may be one of that in Figs. 5, 7 and 9.
  • the second device 120 may determine a set of PRBs (for example, the first set of PRBs) on which the single codebook is carried and a set of PRBs (also referred to as a fourth set of PRBs herein) on which no single codebook is carried. Then, the second device 120 may determine the single codebook based on the codebooks in the first configuration and channel information in the first and fourth set of PRBs, and determine the first information corresponding to the single codebook based on the first configuration.
  • the first set of PRBs and the fourth set of PRBs may be consecutive.
  • any other suitable ways are also feasible.
  • multiple codebooks may be designed for the at least one data stream, for example, in case that the mapping form of the second configuration may be one of that in Figs. 4, 6 and 8 along or in combination with layer grouping.
  • the second device 120 may determine a set of PRBs (for example, the second set of PRBs) on which the first codebook is carried and a set of PRBs (for example, the third set of PRBs) on which the second codebook is carried, and also determine a set of PRBs (also referred to as a fifth set of PRBs herein) on which no first or second codebook is carried.
  • the second device 120 may determine the first codebook based on the first set of codebooks and channel information in the second and fifth set of PRBs, and determine the second codebook based on the second set of codebooks and channel information in the third and fifth set of PRBs. In this way, the second device 120 may determine the first information from the first configuration based on the first and second codebooks.
  • the second set of PRBs and the fifth set of PRBs may be consecutive.
  • the third set of PRBs and the fifth set of PRBs may be consecutive.
  • any other suitable ways are also feasible.
  • mapping form of the second configuration is that in Fig. 5, i.e., codebooks are mapped to a single PRB for each SB.
  • a codebook vector is configured in the first PRB across P CSI-RS ports and is one of column vector of V r in Table 1.
  • an equivalent channel matrix H may be acquired in the first PRB, such as expression (1) .
  • H 1 has the dimension of N rx ⁇ P and N rx is the number of receive antenna ports.
  • No codebook is configured in the second PRB, so physical channel matrix is acquired, such as H 2 with the dimension of N rx ⁇ P.
  • Channel estimates on a given CSI-RS port are supposed not to vary much for two consecutive PRBs, so the channel matrices are quite similar for the two PRBs. Then the following expression (2) can be obtained.
  • w 1 and w 2 are the normalized versions of the channel matrices respectively, for example, as shown in expressions (3) and (4) .
  • the equivalent channel matrix H may be transformed in the first PRB as shown in expression (6) .
  • w 1 and w 2 may be set to channel vectors in a receive port or eigenvectors for the channel matrices.
  • the second device 120 may search from all the columns of codebooks V r and seeks out the exact codebook used by the first device 110 according to a decoding metric A for each pair of channel matrices in the two PRBs of the i-th subband.
  • the decoding metric A is shown as expression (7) .
  • V r (: , m) is a column vector of signature codebooks V r with norm 1, m ⁇ ⁇ 1, 2, ..., 2 r ⁇ .
  • the second device 120 may transform all the detected codebooks to the corresponding FD components for multiple layers according to the first configuration. Consequently, the second device 120 may detect all the M FD components indicated by the first device 110 for each layer. That is, the first information is determined.
  • the second device 120 transmits 308 CSI to the first device 110.
  • the second device 120 may multiply DL channel matrices by FD components for FD transformation and calculate linear combination (LC) coefficients. Then the second device 120 may report the CSI items related to LC coefficients to the first device 110. In this case, FD component selection has no need to be reported. Accordingly, the first device 110 may reconstructs 309 channel matrices according to SRS measurement as well as CSI reports from the second device 120.
  • FD component selection by the first device 110 can be indicated to the second device 120 by means of RSs with certain codebook. In this way, FD component selection can be dynamically indicated from the first device to the second device with low overhead.
  • Fig. 11 illustrates a flowchart of a method 1100 of communication implemented at a first device according to example embodiments of the present disclosure.
  • the method 1100 can be implemented at the first device 110 shown in Fig. 1.
  • the method 1100 will be described with reference to Fig. 1. It is to be understood that method 1100 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 receives a first plurality of RSs from a second device 120 on PRBs in a SB.
  • the first device 110 determines first information as to whether a FD component associated with the SB is selected for at least one data stream.
  • the first device 110 determines at least one codebook for the first information based on a first configuration, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks.
  • the first device 110 may determine the single codebook from the one or more respective codebooks in the first configuration.
  • the at least one data stream comprises a first set of data streams and a second set of data streams
  • the at least one codebook comprises a first codebook for the first set of data streams and a second codebook for the second set of data streams
  • the first configuration comprises a first set of codebooks for the first set of data streams and a second set of codebooks for the second set of data streams
  • the first device 110 may determine the first codebook from the first set of codebooks and determine the second codebook from the second set of codebooks.
  • the first device 110 transmits a subset of a second plurality of RSs with the at least one codebook to the second device 120 on a part of the PRBs, the part of the PRBs determined from a second configuration indicating whether the at least one codebook is to be carried for the PRBs.
  • the first device 110 may determine, from the second configuration, a first set of PRBs in the PRBs on which the single codebook is to be carried. Then, the first device 110 may transmit the subset of the second plurality of RSs with the single codebook on the first set of PRBs; and transmitting other RSs in the second plurality of RSs than the subset on other PRBs in the PRBs than the first set of PRBs.
  • the at least one data stream comprises a first set of data streams and a second set of data streams
  • the at least one codebook comprises a first codebook for the first set of data streams and a second codebook for the second set of data streams
  • the first configuration comprises a first set of codebooks for the first set of data streams and a second set of codebooks for the second set of data streams
  • the first device 110 may determine, from the second configuration, a second set of PRBs in the PRBs on which the first codebook is to be carried and a third set of PRBs in the PRBs on which the second codebook is to be carried.
  • the first device 110 may transmit a first portion in the subset of the second plurality of RSs with the first codebook on the second set of PRBs, transmit a second portion in the subset of the second plurality of RSs with the second codebook on the third set of PRBs, and transmit other RSs in the second plurality of RSs than the first and second portions on other PRBs in the PRBs than the second and third set of PRBs.
  • the first device 110 may generate the first and second configurations, and transmit the first and second configurations to the second device 120.
  • the first device 110 may further generate a first indication indicating that the second plurality of RSs carry the first information, and transmit the first indication to the second device 120.
  • the first device 110 may further generate a second indication indicating a mapping form to be used for the second configuration, and transmit the second indication to the second device 120.
  • FD component selection can be dynamically indicated from the first device to the second device with low overhead.
  • Fig. 12 illustrates a flowchart of a method 1200 of communication implemented at a second device according to example embodiments of the present disclosure.
  • the method 1200 can be implemented at the second device 120 shown in Fig. 1.
  • the method 1200 will be described with reference to Fig. 1. It is to be understood that method 1200 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 receives a second plurality of RSs from the first device 110 on PRBs in a SB.
  • the second device 120 may receive the first and second configurations from the first device 110.
  • the second device 120 may further receive a first indication indicating that the second plurality of RSs carry the first information.
  • the second device 120 may further receive a second indication indicating a mapping form to be used for the second configuration.
  • the second device 120 determines, based on first and second configurations, first information as to whether a FD component associated with the SB is selected for at least one data stream, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks, and the second configuration indicating whether at least one codebook is to be carried for the PRBs.
  • the second device 120 may determine, based on the second configuration, a first set of PRBs in the PRBs on which the single codebook is carried and a fourth set of PRBs in the PRBs on which no single codebook is carried. Then the second device 120 may determine the single codebook based on the one or more respective codebooks and channel information in the first and fourth set of PRBs and determine the first information corresponding to the single codebook based on the first configuration.
  • the second device 120 may determine, based on the second configuration, a second set of PRBs in the PRBs on which the first codebook is carried, a third set of PRBs in the PRBs on which the second codebook is carried and a fifth set of PRBs in the PRBs on which no first or second codebook is carried.
  • the second device 120 may determine the first codebook based on the first set of codebooks and channel information in the second and fifth set of PRBs, determine the second codebook based on the second set of codebooks and channel information in the third and fifth set of PRBs, and determine the first information from the first configuration based on the first and second codebooks.
  • the second device 120 transmits CSI to the first device 110 based on the first information.
  • FD component selection can be dynamically decoded by the second device in RSs from the first device, without indicating the FD component selection to the first device. In this way, a reduced complexity of the second device can be achieved.
  • an apparatus capable of performing the method 1100 may comprise means for performing the respective steps of the method 1100.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus may comprise: means for in response to receiving a first plurality of reference signals from a second device on physical resource blocks in a subband, determining, at a first device, first information as to whether a frequency domain component associated with the subband is selected for at least one data stream; means for determining at least one codebook for the first information based on a first configuration, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks; and means for transmitting a subset of a second plurality of reference signals with the at least one codebook to the second device on a part of the physical resource blocks, the part of the physical resource blocks determined from a second configuration indicating whether the at least one codebook is to be carried for the physical resource blocks.
  • the apparatus may further comprise: means for generating the first and second configurations; and means for transmitting the first and second configurations to the second device.
  • the apparatus may further comprise: means for generating a first indication indicating that the second plurality of reference signals carry the first information; and means for transmitting the first indication to the second device.
  • the apparatus may further comprise: means for generating a second indication indicating a mapping form to be used for the second configuration; and means for transmitting the second indication to the second device.
  • the at least one codebook may comprise a single codebook for the at least one data stream.
  • the means for determining the at least one codebook may comprise means for determining the single codebook from the one or more respective codebooks.
  • the means for transmitting the subset of the second plurality of reference signals may comprise: means for determining, from the second configuration, a first set of physical resource blocks in the physical resource blocks on which the single codebook is to be carried; means for transmitting the subset of the second plurality of reference signals with the single codebook on the first set of physical resource blocks; and means for transmitting other reference signals in the second plurality of reference signals than the subset on other physical resource blocks in the physical resource blocks than the first set of physical resource blocks.
  • the at least one data stream may comprise a first set of data streams and a second set of data streams
  • the at least one codebook may comprise a first codebook for the first set of data streams and a second codebook for the second set of data streams
  • the first configuration may comprise a first set of codebooks for the first set of data streams and a second set of codebooks for the second set of data streams.
  • the means for determining the at least one codebook may comprise: means for determining the first codebook from the first set of codebooks; and means for determining the second codebook from the second set of codebooks.
  • the means for transmitting the subset of the second plurality of reference signals may comprise: means for determining, from the second configuration, a second set of physical resource blocks in the physical resource blocks on which the first codebook is to be carried and a third set of physical resource blocks in the physical resource blocks on which the second codebook is to be carried; means for transmitting a first portion in the subset of the second plurality of reference signals with the first codebook on the second set of physical resource blocks; means for transmitting a second portion in the subset of the second plurality of reference signals with the second codebook on the third set of physical resource blocks; and means for transmitting other reference signals in the second plurality of reference signals than the first and second portions on other physical resource blocks in the physical resource blocks than the second and third set of physical resource blocks.
  • an apparatus capable of performing the method 1200 may comprise means for performing the respective steps of the method 1200.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus may comprise: means for receiving, at a first device, a second plurality of reference signals from a first device on physical resource blocks in a subband; means for determining, based on first and second configurations, first information as to whether a frequency domain component associated with the subband is selected for at least one data stream, the first configuration indicating a mapping between one or more candidate contents of the first information and one or more respective codebooks, and the second configuration indicating whether at least one codebook is to be carried for the physical resource blocks; and means for transmitting channel state information to the first device based on the first information.
  • the apparatus may further comprise: means for receiving the first and second configurations from the first device.
  • the apparatus may further comprise: means for receiving a first indication indicating that the second plurality of reference signals carry the first information.
  • the means for determining the first information may comprise means for determining the first information upon receipt of the first indication.
  • the apparatus may further comprise: means for receiving a second indication indicating a mapping form to be used for the second configuration.
  • the means for determining the first information may comprise means for determining the first information based on the first and second configurations upon receipt of the second indication.
  • the at least one codebook may comprise a single codebook for the at least one data stream.
  • the means for determining the first information may comprise: means for determining, based on the second configuration, a first set of physical resource blocks in the physical resource blocks on which the single codebook is carried and a fourth set of physical resource blocks in the physical resource blocks on which no single codebook is carried; means for determining the single codebook based on the one or more respective codebooks and channel information in the first and fourth set of physical resource blocks; and means for determining the first information corresponding to the single codebook based on the first configuration.
  • the at least one data stream may comprise a first set of data streams and a second set of data streams
  • the at least one codebook comprises a first codebook for the first set of data streams and a second codebook for the second set of data streams
  • the first configuration comprises a first set of codebooks for the first set of data streams and a second set of codebooks for the second set of data streams.
  • the means for determining the first information may comprise: means for determining, based on the second configuration, a second set of physical resource blocks in the physical resource blocks on which the first codebook is carried, a third set of physical resource blocks in the physical resource blocks on which the second codebook is carried and a fifth set of physical resource blocks in the physical resource blocks on which no first or second codebook is carried; means for determining the first codebook based on the first set of codebooks and channel information in the second and fifth set of physical resource blocks; means for determining the second codebook based on the second set of codebooks and channel information in the third and fifth set of physical resource blocks; and means for determining the first information from the first configuration based on the first and second codebooks.
  • FIG. 13 is a simplified block diagram of a device 1300 that is suitable for implementing embodiments of the present disclosure.
  • the device 1300 may be provided to implement the first device or the second device, for example the first device 110 or the second device 120 as shown in Fig. 1.
  • the device 1300 includes one or more processors 1310, one or more memories 1320 coupled to the processor 1310, and one or more communication modules 1340 (such as, transmitters and/or receivers) coupled to the processor 1310.
  • the communication module 1340 is for bidirectional communications.
  • the communication module 1340 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 1310 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 1400 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 1320 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) 1324, 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) 1322 and other volatile memories that will not last in the power-down duration.
  • a computer program 1330 includes computer executable instructions that are executed by the associated processor 1310.
  • the program 1330 may be stored in the ROM 1324.
  • the processor 1310 may perform any suitable actions and processing by loading the program 1330 into the RAM 1322.
  • the embodiments of the present disclosure may be implemented by means of the program 1330 so that the device 1300 may perform any process of the disclosure as discussed with reference to Figs. 1 to 12.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 1330 may be tangibly contained in a computer readable medium which may be included in the device 1300 (such as in the memory 1320) or other storage devices that are accessible by the device 1300.
  • the device 1300 may load the program 1330 from the computer readable medium to the RAM 1322 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. 14 shows an example of the computer readable medium 1400 in form of CD or DVD.
  • the computer readable medium has the program 1330 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 methods 1100 and 1200 as described above with reference to Figs. 11 and 12.
  • 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

Des modes de réalisation de la présente divulgation concernent l'indication de composants de domaine fréquentiel. Un procédé comprend en réponse à la réception d'une première pluralité de signaux de référence en provenance d'un second dispositif sur des blocs de ressources physiques dans une sous-bande, la détermination, dans un premier dispositif, de premières informations pour indiquer si un composant de domaine fréquentiel associé à la sous-bande est sélectionné pour au moins un flux de données ; la détermination d'au moins un livre de codes pour les premières informations sur la base d'une première configuration ; et la transmission d'un sous-ensemble d'une seconde pluralité de signaux de référence avec le ou les livres de codes au second dispositif sur une partie des blocs de ressources physiques. Le procédé comprend en outre : la réception, dans un second dispositif, de la seconde pluralité de signaux de référence ; la détermination des premières informations sur la base des première et seconde configurations ; et la transmission d'informations d'état de canal au premier dispositif sur la base des premières informations. De cette façon, une sélection d'un composant de domaine fréquentiel peut être indiquée dynamiquement du premier dispositif au second dispositif avec un faible surdébit.
PCT/CN2020/121583 2020-10-16 2020-10-16 Indication de composants de domaine fréquentiel WO2022077463A1 (fr)

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