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WO2021046783A1 - Retour d'informations d'état de canal - Google Patents

Retour d'informations d'état de canal Download PDF

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Publication number
WO2021046783A1
WO2021046783A1 PCT/CN2019/105482 CN2019105482W WO2021046783A1 WO 2021046783 A1 WO2021046783 A1 WO 2021046783A1 CN 2019105482 W CN2019105482 W CN 2019105482W WO 2021046783 A1 WO2021046783 A1 WO 2021046783A1
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WIPO (PCT)
Prior art keywords
csi
matrix
mode
channel
determining
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Ceased
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PCT/CN2019/105482
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English (en)
Inventor
Hao Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
Original Assignee
Nokia Shanghai Bell Co Ltd
Nokia Solutions and Networks Oy
Nokia Technologies Oy
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Priority to PCT/CN2019/105482 priority Critical patent/WO2021046783A1/fr
Priority to CN201980099972.1A priority patent/CN114342281B/zh
Publication of WO2021046783A1 publication Critical patent/WO2021046783A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—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
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to a method, device, apparatus and computer readable storage medium for channel state information (CSI) feedback.
  • CSI channel state information
  • type-2 codebook has been introduced, due to a superior performance gains over that can be achieved in 3GPP LTE Rel-14.
  • type-2 codebook is further designed to specify and support frequency domain compression techniques, which can significantly reduce CSI feedback overhead per sub-band level without any performance loss.
  • NR 5G New Radio
  • MIMO massive Multi-Input Multi-Output
  • MU-MIMO Multi-User Multi-Input Multi-Output
  • Current systems generally require a finer granularity and a higher accuracy for channel feedback, as well as a reasonable feedback overhead.
  • the CSI feedback with a coarse frequency granularity may unavoidably restrict MU pre-coding accuracy and MU-MIMO scheduling performance improvement.
  • example embodiments of the present disclosure provide a solution for CSI feedback.
  • a first 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 first device to, determine a first indicator of a first CSI mode based on current measurement of a channel between the first device and a second device; determine a second indicator of a second CSI mode at least in part based on previous CSI feedback; and select, from the first CSI mode and the second CSI mode, a target CSI mode for current CSI feedback based on the first indicator and the second indicator.
  • a second device comprises at least one processor; and at least one memory including computer program codes; the at least one memory and the computer program codes are configured to, with the at least one processor, cause the second device to determine a target CSI mode from a first part of current CSI feedback for a channel between a first device and the second device, the target CSI mode being selected from a first CSI mode and a second CSI mode for current CSI feedback by the first device; and receive, based on the target CSI mode, a second part of the current CSI feedback.
  • a method implemented at a first device comprises: determining a first indicator of a first CSI mode based on current measurement of a channel between the first device and a second device; determining a second indicator of a second CSI mode at least in part based on previous CSI feedback; and selecting, from the first CSI mode and the second CSI mode, a target CSI mode for current CSI feedback based on the first indicator and the second indicator.
  • a method implemented at a second device comprises determining a target CSI mode from a first part of current CSI feedback for a channel between a first device and the second device, the target CSI mode being selected from a first CSI mode and a second CSI mode for current CSI feedback by the first device; and receiving, based on the target CSI mode, a second part of the current CSI feedback.
  • an apparatus comprising: means for determining a first indicator of a first CSI mode based on current measurement of a channel between the first device and a second device; means for determining a second indicator of a second CSI mode at least in part based on previous CSI feedback; and means for selecting, from the first CSI mode and the second CSI mode, a target CSI mode for current CSI feedback based on the first indicator and the second indicator.
  • an apparatus comprising: means for determining a target CSI mode from a first part of current CSI feedback for a channel between a first device and the second device, the target CSI mode being selected from a first CSI mode and a second CSI mode for CSI feedback; and means for receiving, based on the target CSI mode, a second part of the current CSI feedback.
  • a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the above third or fourth aspect.
  • FIG. 1 shows an example communication network in which example embodiments of the present disclosure may be implemented
  • FIG. 2 illustrates a flowchart of a method implemented at a first device according to some embodiments of the present disclosure
  • FIG. 3 illustrates a flowchart of a method implemented at a second device according to some embodiments of the present disclosure
  • FIG. 4 shows a diagram of a signaling flow of the transmission of CSI according to some example embodiments of the present disclosure
  • Fig. 5 illustrates a simplified block diagram of an apparatus that is suitable for implementing embodiments of the present disclosure.
  • Fig. 6 illustrates a block diagram of an example computer readable medium in accordance with some embodiments of the present disclosure.
  • references in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.
  • the term “communication network” refers to a network following any suitable communication standards, such as Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Narrow Band Internet of Things (NB-IoT) and so on.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • NB-IoT Narrow Band Internet of Things
  • the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • suitable generation communication protocols including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the future fifth generation (5G) communication protocols, and/or any other protocols either currently known or to be developed in the future.
  • Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the a
  • the term “first device” refers to any end device that may be capable of wireless communication.
  • the first device may be a terminal device.
  • a terminal device may also be referred to as a communication device, user equipment (UE) , a Subscriber Station (SS) , a Portable Subscriber Station, a Mobile Station (MS) , or an Access Terminal (AT) .
  • UE user equipment
  • SS Subscriber Station
  • MS Mobile Station
  • AT Access Terminal
  • the terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA) , portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE) , laptop-mounted equipment (LME) , USB dongles, smart devices, wireless customer-premises equipment (CPE) , an Internet of Things (IoT) device, a watch or other wearable, a head-mounted display (HMD) , a vehicle, a drone, a medical device and applications (e.g., remote surgery) , an industrial device and applications (e.g., a robot and/or other wireless devices operating in an industrial and/or an automated processing chain contexts) , a consumer electronics device, a device operating on commercial and/
  • the term “second device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom.
  • the second device may be a network device.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • RRU
  • An explicit CSI feedback design is proposed for exploiting time domain channel sparsity property to reduce CSI feedback overhead and improve CSI accuracy.
  • a certain compression criterion such as orthogonal matching pursuit (OMP)
  • OMP orthogonal matching pursuit
  • significant channel taps among all the channel taps in the time domain channel are selected to form a sparsifying basis matrix which includes for example, discrete Fourier transform (DFT) vectors.
  • DFT basis design i.e., a predetermined set of DFT vectors
  • the first device e.g., the UE
  • the second device e.g., the gNB
  • the second device may reconstruct the sparsifying basis matrix by the indices of the DFT vectors.
  • the CSI feedback overhead mainly depends on quantization of the compressed linear combination (LC) coefficients, which is related to the number of significant channel taps between the first device and the second device.
  • Another CSI feedback design is proposed to provide a better channel compression behavior by using channel statistics based on Karhunen-Loeve transform (KLT) .
  • KLT Karhunen-Loeve transform
  • a sparsifying basis matrix is built from dominant eigenvectors of frequency domain (FD) covariance matrix with a size of N f ⁇ N f , where N f denotes the number of active subcarriers.
  • FD frequency domain
  • Embodiments of the present disclosure provide a dynamic scheme for explicit CSI feedback.
  • a target CSI mode for current CSI feedback may be switched between different CSI modes by using a high layer configured parameter, such as a switching factor ⁇ .
  • the first device e.g., the UE
  • the first device may select the target CSI mode such that an optimal trade-off between system performance and CSI feedback payload can be realized.
  • the scheme is capable of saving the CSI payload and increasing the cell average throughout.
  • a terminal device may have an active connection with a network device when being located within the corresponding cell.
  • the terminal device may communicate with that network device on the frequency band in both an uplink (UL) and a downlink (DL) .
  • the terminal device may need to switch a link in one direction such as the UL to a further network device due to various reasons such as quality degradation in the UL.
  • FIG. 1 shows an example communication network 100 in which implementations of the present disclosure can be implemented.
  • the communication network 100 includes a first device 110 and a second device 120.
  • the network 100 can provide one or more cells to serve the first device 110. It is to be understood that the numbers of first device, second device and/or the cells are given for the purpose of illustration without suggesting any limitations to the present disclosure.
  • the communication network 100 may include any suitable number of network devices, terminal devices and/or cells adapted for implementing implementations of the present disclosure.
  • the first device 110 may communicate data and CSI feedback to the second device 120, and the second device 120 may allocate resource for the first device 110 and receive CSI feedback from the first device 110.
  • a link from the first device 110 to the second device 120 is referred to as an uplink (UL)
  • a link from the second device 120 to the first device 110 is referred to as a downlink (DL) .
  • the CSI may ensure reliability of the wireless communication between the first device 110 and the second device 120.
  • the process for reporting the CSI is also called as “CSI feedback” .
  • the second device 120 may allocate resource for the first device 110. Then, the first device 110 may report the CSI to the second device 120 on the PUSCH.
  • the communications in the network 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , and the like.
  • GSM Global System for Mobile Communications
  • LTE Long Term Evolution
  • LTE-A LTE-Evolution
  • LTE-Advanced LTE-A
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GERAN GSM EDGE Radio Access Network
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth
  • the CSI feedback includes a set of CSI feedback parameters, which may be split into two parts, i.e., CSI part 1 and CSI part 2.
  • CSI part 1 has a fixed payload size
  • CSI part 2 has a variable payload size depending on the parameters included in the CSI part 1.
  • FIG. 2 illustrates a flowchart of a method 200 implemented at a first device according to some example embodiments of the present disclosure. For the purpose of discussion, the process 200 will be described with reference to FIG. 1. The process 200 may involve the first device 110 and the second device 120 as illustrated in FIG. 1.
  • the first device 110 may measure the channel between the first device 110 and the second device 120 from the current measurement of the downlink channel, for example, measurement of CSI reference signal (CSI-RS) .
  • the first device 110 may then determine a channel matrix H FD for characterizing the channel based on the current measurement of the channel.
  • the channel matrix H FD may represent the measured channel.
  • the channel matrix H FD may be a frequency domain matrix obtained based on downlink measurement with a dimension of N f ⁇ N p , and the channel matrix H FD may be represented as follows.
  • N f is the number of active subcarriers
  • N tx is the number of transmit ports of the second device 120
  • N rx is the number of receive ports of the first device 110.
  • the number of the transmit ports may be the number of transmit antennas of the second device, in the case that there is no spatial-domain compression. If the spatial-domain compression is performed, spatial domain beams may be formed and the number of the transmit ports may be the number of the spatial domain beams.
  • the number of the receive ports may be the number of receive antennas of the first device, if there is no spatial-domain compression. If the spatial-domain transformation is performed, spatial domain beams may be also formed and the number of the receive ports may be the number of the spatial domain beams.
  • a set of discrete Fourier Transform (DFT) vectors may be predetermined and known by both the first device 110 and the second device 120.
  • the first device 110 may select at least a part of DFT vectors form a first basis matrix with a size of N f ⁇ N p , where N tap is the number of dominant taps.
  • the at least a part of DFT vectors may be determined by for example OMP searching rule.
  • the channel matrix H FD may be compressed into a first transformed matrix H TD1 .
  • the first transformed matrix H TD1 may be determined by the formula which consists of a set of compressed linear combination (LC) coefficients with a lower dimension N tap ⁇ N p , since the number of dominant taps N tap is far less than the number of active subcarriers N f .
  • the first basis matrix is common to all N p channel paths, and may be represented as follows.
  • the first transformed matrix H TD1 may then be quantized, and thus a quantization version of the first transformed matrix H TD1 , denoted as is obtained.
  • a quantized channel matrix which represents the estimated channel, may be restored by leveraging the formula
  • NMSE normalized mean square error
  • the first device 110 may determine a first indicator of a first CSI mode based on the current measurement of the channel.
  • the first indicator may be NMSE DFT .
  • the first CSI mode may be designed to feedback the following CSI parameters, including but not limited to, a selected set of tap indices in the first basis matrix and N tap ⁇ N p LC coefficients in a quantization version of the first transformed matrix H TD1 , which is denoted as It should be understood that the first CSI mode may include other necessary CSI parameters for reconstructing the channel information.
  • the first device 120 may determine a second indicator of a second CSI mode at least in part based on previous CSI feedback.
  • the second indicator of the second CSI mode is determined based on previous CSI feedback and the current measurement of the channel.
  • the second CSI mode may further consider the previous CSI feedback.
  • the second CSI mode may take the advantage of Karhunen-Loeve transform (KLT) which leads to a very limited CSI feedback overhead.
  • KLT Karhunen-Loeve transform
  • the estimated matrix is reconstructed by exploiting the previous CSI feedback information, which has been shared to both the first device 110 and the second device 120.
  • the estimated matrix may be represented as follows.
  • a second basis vector related to the channel path n may be obtained through the following two options.
  • a covariance matrix R H of the estimated matrix and its eigen decomposition (ED) may be determined, and the second basis vector is the dominant eigenvector from U as follows.
  • the covariance matrix R H has a dimension of N f ⁇ N f
  • U is formed by eigenvectors and ⁇ is composed of eigenvalues along the main diagonal.
  • the estimated channel vector is normalized and the normalization version of the channel vector is directly used as the second basis vector which is represented as below.
  • the second basis vector may then be used for FD compression in the currently measured channel vector where is the n-th column of the current channel matrix H FD .
  • a corresponding LC coefficient is calculated for channel path n as follows.
  • the respective LC coefficients for all the channel paths may be quantized as and formed into a quantization version of the second transformed matrix H TD2 , which is denoted as and thus the estimated channel matrix may be obtained as follows.
  • NMSE normalized mean square error
  • the second indicator may be NMSE KLT
  • the second CSI mode may be designed to feedback 1 ⁇ N p LC coefficients in the quantized second transformed matrix and have no need to feedback the second basis matrix including a set of basis vectors since they are determined from the previous CSI feedback which have been known in both the first device 110 and the second device 120.
  • the second CSI mode may include other necessary CSI parameters for reconstructing the channel information.
  • the first device 110 may select, from the first CSI mode and the second CSI mode, a target CSI mode for the current CSI feedback based on the first indicator and the second indicator.
  • the first device 110 may receive a switching factor ⁇ for selecting the target CSI mode via a high layer RRC signaling message from the second device 120.
  • the switching factor ⁇ ranging from 0 to 1 (i.e., ⁇ [0, 1] ) is defined for adjusting and comparing the first indicator and the second indicator, such the NMSE values of the above two CSI modes. Then, the target CSI mode for current CSI feedback may be determined based on for example whether the following condition is satisfied
  • the first CSI mode is the DFT based CSI mode
  • the second CSI mode is the KLT based CSI mode.
  • the second indicator is adjusted by the switching factor ⁇ . If the adjusted second indicator NMSE KLT , such as the product of the value NMSE KLT and the switching factor ⁇ is greater than the first indicator NMSE DFT , the first CSI mode is selected as the target CSI mode. And, if the adjusted second indicator is less than or equal to the first indicator NMSE DFT , the second CSI mode is selected as the target CSI mode.
  • the first CSI mode corresponding to DFT based CSI mode utilizes only the current measurement of the channel for CSI feedback, and thus has a higher feedback accuracy; while the second CSI mode corresponding to the KLT based CSI mode utilizes both the previous CSI feedback and the currently measured channel information for CSI feedback, and thus has a significantly lower CSI feedback overhead.
  • the switching probabilities of different CSI modes are effectively adjusted by the switching factor ⁇ , the payload and system performance of explicit CSI feedback can be flexibly controlled.
  • the first device 110 may transmit the current CSI feedback indicating the target CSI mode to the second device 120.
  • the current CSI feedback may include a CSI mode indicator for indicating the target CSI mode. This aspect will be discussed in details below.
  • FIG. 3 illustrates a flowchart of a method 300 implemented at a second device according to some other embodiments of the present disclosure.
  • the method 300 can be implemented by the second device 120 as shown in FIG. 1.
  • the process 300 will be described with reference to FIG. 1.
  • the second device 120 may determine the target CSI mode from a first part of current CSI feedback for the channel between the first device 110 and the second device 120, at 310. For example, the second device 120 may determine the target CSI mode from the CSI mode indicator included in the first part of current CSI feedback.
  • the second device 120 may receive, at least in part based on the target CSI mode, a second part of the current CSI feedback.
  • the CSI parameters included in the two-part CSI structure are listed in Table 1 below.
  • the CSI mode indicator is defined to indicate the target CSI mode of the current CSI feedback
  • NZ non-zero linear combination
  • K 0 a maximum number of NZ LC coefficients K 0 is defined as an RRC configured parameter, where K 0 ⁇ N tap ⁇ N p and N tap ⁇ 1 is also a RRC configured parameter.
  • the number of NZ LC coefficients may be quantized as bits.
  • SD spatial domain
  • the selection of channel taps is transmitted only in a case that the first CSI mode, i.e., DFT based CSI mode is selected, and DFT vectors corresponding to tap indices are selected from DFT matrix with dimension of N f ⁇ N f .
  • the indication of the section of a set of taps occupies bits;
  • bitmap of LC coefficient occupies different bits depending on the target CSI mode.
  • the bitmap is defined with N tap ⁇ 2L ⁇ N rx bits which indicate the locations and types of LC coefficients (e.g., zero or non-zero LC coefficients) . For example, “1” denotes non-zero coefficient and “0” denotes zero coefficient. There is no need to report the amplitude and phase value of a zero coefficient in terms of bitmap indication.
  • a corresponding bitmap is defined with 2L ⁇ N rx bits.
  • the index of the strongest NZ LC coefficient is signalled using bits.
  • the above CSI parameters are described only for the purpose of illustration, without suggesting any limitation as to the scope of the disclosure, and the CSI feedback may include other necessary CSI parameters for reconstructing the channel information.
  • the second device 120 may obtain at least a bitmap of a first transformed matrix H TD1 and tap indices of at least part of taps associated with a channel matrix for characterizing the channel.
  • the first transformed matrix H TD1 is determined based on at least a part of the current CSI feedback, such as the CSI mode indicator, the number of NZ LC coefficients K, the bitmap of LC coefficients, the strongest NZ LC coefficient, and amplitude and phase quantization of NZ LC coefficients.
  • the bitmap indicates locations and types of LC coefficients in the first transformed matrix H TD1 , and a size of the bitmap is associated with the number of the at least part of taps and the number of receive ports in the first device 110 and the number of transmit ports in the second device 120.
  • the second device 120 may obtain at least the bitmap of a second transformed matrix H TD2 .
  • the second transformed matrix H TD2 is determined based on at least a part of the current CSI feedback, and the bitmap indicates locations and types of LC coefficients in the second transformed matrix H TD2 , and a size of the bitmap is associated with the number of receive ports in the first device 110 and the number of transmit ports in the second device 120.
  • the second device 120 may determine a first basis matrix based on the tap indices of at least part of taps included in second part of the current CSI feedback and a set of vectors shared by the first device 110 and the second device 120.
  • the second device 120 may reconstruct the channel matrix, that is, the estimated channel matrix at least in part based on the first basis matrix and the first transformed matrix for example by the formula
  • the second device 120 may determine the second basis matrix based on previous CSI feedback, and then reconstruct the channel matrix, that is the estimated channel matrix at least in part based on the second basis matrix and the second transformed matrix for example by
  • the first CSI mode may utilize a DFT operation
  • the second CSI mode may utilize a Karhunen-Loeve transform-based operation.
  • N f 600.
  • N tap ⁇ 2L ⁇ N rx For sake of simplicity, assuming that the number of NZ LC coefficients equals to the total number of LC coefficients, N tap ⁇ 2L ⁇ N rx , and thus the bitmap indication as well as the CSI part 1 are not considered in the statistic of payload below for explicit CSI.
  • the strongest one of all the LC coefficients is signaled using bits for indicating the location and 4 bits for phase/amplitude quantization respectively.
  • Other LC coefficients are first normalized by the strongest coefficient, and then quantized separately in terms of 4-bit phase and 3-bit amplitude. The detailed statistic of payload is listed in Table 2 below.
  • the strongest one of all the LC coefficients is signaled by using bits for location indication and 4 bits for phase/amplitude quantization respectively.
  • Other LC coefficients are first normalized by the strongest coefficient, and then quantized separately in terms of 4-bit phase and 3-bit amplitude.
  • the sparsifying basis vectors for example, the second basis vectors, have no need to be reported since they can be obtained according to the previous CSI feedback information and have been known in both the first device 110 and the second device 120 side.
  • the detailed statistics of the payload for KLT based CSI mode is listed in Table 3.
  • the payload size for each CSI mode is calculated separately as above, and then according to the average switching ratio statistic, i.e. ⁇ for KLT based CSI mode selection probability, the average payload size is determined as (1- ⁇ ) ⁇ 619+ ⁇ 128 for dynamic explicit CSI feedback.
  • N 3 13;
  • Reference amplitude quantization is 4 bits for strongest FD coefficient in the weak polarization
  • Phase quantization of LC coefficients is 3 bits.
  • N 3 13;
  • Sub-band differential amplitude quantization of LC coefficients is 1 bits
  • Sub-band phase quantization of LC coefficients is 3 bits
  • Table 6 shows a comparison of respective total payload of the above CSI schemes.
  • the full buffer system level evaluations are carried out in LTE 3D UMA scenario.
  • the relevant simulation parameters are listed in Table 7 below.
  • Rel-15 and Rel-16 Type II CSI is used as performance reference.
  • the simulation results are shown in Table 8.
  • the switching factor ⁇ is set to 0.9, 62%of CSI modes are switched as KLT based explicit CSI exploiting the preceding CSI feedback information, and thus dynamic explicit CSI has significantly reduced feedback overhead by 49%compared with fixed DFT based CSI mode while has only limited performance loss. Comparing with Rel. 16 CSI, dynamic explicit CSI still has 16%of payload saving capability and above 10%gain of cell average throughput. Therefore, adjusting the switching factor ⁇ can realize the tradeoff between system performance and feedback payload for dynamic explicit CSI feedback, and it provides an effective implementation method for explicit CSI in Rel-17 NR MIMO.
  • FIG. 4 shows a diagram of a signaling flow of the transmission of CSI according to some example embodiments of the present disclosure.
  • the process 400 can be implemented between the first device 110 and the second device 120 as shown in FIG. 1. For the purpose of discussion, the process 400 will be described with reference to FIG. 1.
  • the first device 110 may determine 405 a first indicator of a first CSI mode based on current measurement of a channel between the first device and a second device, and determine 410 a second indicator of a second CSI mode at least in part based on previous CSI feedback.
  • the first device 110 may then select 415, from the first CSI mode and the second CSI mode, a target CSI mode for current CSI feedback based on the first indicator and the second indicator.
  • the first device 110 may transmit 420, to the second device 120, the current CSI feedback indicating the target CSI mode.
  • the current CSI feedback also includes other CSI parameters, such as, the number of NZ LC coefficients K, the selection of SD beams, the selection of channel taps, the bitmap of LC coefficients and so on.
  • the second device 120 upon receiving the current CSI feedback, may determine 425 the target CSI mode from a first part of current CSI feedback.
  • the second device 120 may receive 430, at least in part based on the target CSI mode, a second part of the current CSI feedback. Then, the second device 120 may reconstruct 435 the channel matrix for charactering the channel.
  • an apparatus capable of performing any of the method 200 may comprise means for performing the respective steps of the method 200.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises means for determining a first indicator of a first CSI mode based on current measurement of a channel between the first device and a second device; means for determining a second indicator of a second CSI mode at least in part based on previous CSI feedback; and means for selecting, from the first CSI mode and the second CSI mode, a target CSI mode for current CSI feedback based on the first indicator and the second indicator CSI parameter set indicating at least the payload of the first portion of the target CSI report.
  • the apparatus further comprises means for performing other steps in some embodiments of the method 200.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • the apparatus further comprises means for receiving, from the second device, a switching factor for selecting the target CSI mode.
  • the apparatus further comprises means for adjusting the second indicator by the switching factor; means for in response to the adjusted second indicator is greater than the first indicator, selecting the first CSI mode as the target CSI mode; and means for in response to the adjusted second indicator is less than or equal to the first indicator, selecting the second CSI mode as the target CSI mode.
  • the apparatus further comprises means for generating a channel matrix for characterizing the channel based on the current measurement of the channel; means for determining a first basis matrix indicating tap indices of the at least part of taps of the channel matrix, from a set of vectors shared by the first device and the second device; means for determining a first transformed matrix based on the first basis matrix and the channel matrix; means for determining an estimated channel matrix based on the first transformed matrix and the first basis matrix; and means for determining the first indicator based on a difference between the channel matrix and the estimated channel matrix.
  • the apparatus further comprises means for generating a channel matrix for characterizing the channel based on the current measurement of the channel; means for determining a second basis matrix based on the previous CSI feedback; means for determining a second transformed matrix based on the second basis matrix and the channel matrix ; means for determining an estimated channel matrix based on the second transformed matrix and the second basis matrix; and means for determining the second indicator based on a difference between the channel matrix and the estimated channel matrix.
  • the apparatus further comprises means for obtaining, from the previous CSI feedback, one or more estimated channel vectors corresponding to one or more channel paths between the first device and the second device; means for determining a corresponding covariance matrix for each of the one or more channel paths based on the corresponding estimated channel vector; and means for determining the second basis matrix based on a corresponding dominant eigenvector of the covariance matrix for each of the one or more channel paths.
  • the apparatus further comprises means for obtaining, from the previous CSI feedback, one or more estimated channel vectors corresponding to one or more channel paths between the first device and the second device; and means for determining the second basis matrix by normalizing each of the one or more estimated channel vectors for the corresponding channel path.
  • the apparatus further comprises means for transmitting, to the second device, the current CSI feedback indicating the target CSI mode.
  • the current CSI feedback at least comprises a bitmap of the first transformed matrix and tap indices of at least part of taps associated with the channel matrix, the bitmap indicates locations and types of linear combination coefficients in the first transformed matrix, and a size of the bitmap is associated with the number of the at least part of taps and the number of receive ports in the first device and the number of transmit ports in the second device.
  • the current CSI feedback at least comprises a bitmap of the second transformed matrix
  • the bitmap indicates locations and types of linear combination coefficients in the second transformed matrix
  • a size of the bitmap is associated with the number of receive ports in the first device and the number of transmit ports in the second device.
  • the current CSI feedback comprises a CSI mode indicator for indicating the target CSI mode.
  • the first CSI mode utilizes a discrete Fourier transform-based operation.
  • the second CSI mode utilizes a Karhunen-Loeve transform-based operation.
  • the first device is a terminal device and the second device is a network device.
  • an apparatus capable of performing any of the process 400 may comprise means for performing the respective steps of the process 400.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • the apparatus comprises: means for determining a target CSI mode from a first part of current CSI feedback for a channel between a first device and the second device, the target CSI mode being selected from a first CSI mode and a second CSI mode for current CSI feedback by the first device; and receiving, at least in part based on the target CSI mode, a second part of the current CSI feedback.
  • the apparatus further comprises means for performing other steps in some embodiments of the process 400.
  • the means comprises at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the performance of the apparatus.
  • the apparatus further comprises means for in response to determining that the target CSI mode is the first CSI mode, obtaining at least a bitmap of a first transformed matrix and tap indices of at least part of taps associated with a channel matrix for characterizing the channel, wherein the first transformed matrix is determined based on at least a part of the current CSI feedback, and wherein the bitmap indicates locations and types of linear combination coefficients in the first transformed matrix, and a size of the bitmap is associated with the number of the at least part of taps and the number of receive ports in the first device and the number of transmit ports in the second device.
  • the apparatus further comprises means for determining a first basis matrix based on the tap indices of at least part of taps included in second part of the current CSI feedback and a set of vectors shared by the first device and the second device; and means for reconstructing the channel matrix at least in part based on the first basis matrix and the bitmap of the first transformed matrix.
  • the apparatus further comprises means for in response to determining that the target CSI mode is the second CSI mode, obtaining at least a bitmap of a second transformed matrix, wherein the second transformed matrix is determined based on at least a part of the current CSI feedback, and wherein the bitmap indicates locations and types of linear combination coefficients in the second transformed matrix, and a size of the bitmap is associated with the number of receive ports in the first device and the number of transmit ports in the second device.
  • the apparatus further comprises means for determining a second basis matrix based on previous CSI feedback; and means for reconstructing the channel matrix based on the second basis matrix and the second transformed matrix.
  • the first CSI mode utilizes a discrete Fourier transform-based operation.
  • the second CSI mode utilizes a Karhunen-Loeve transform-based operation.
  • the first device is a terminal device and the second device is a network device.
  • Fig. 5 is a simplified block diagram of a device 500 that is suitable for implementing embodiments of the present disclosure.
  • the device 500 may be provided to implement the communication device, for example the first device 110 or the second device 120 as shown in Fig. 1.
  • the device 500 includes one or more processors 510, one or more memories 520 coupled to the processor 510, and one or more communication modules 540 coupled to the processor 510.
  • the communication module 540 is for bidirectional communications.
  • the communication module 540 has at least one antenna to facilitate communication.
  • the communication interface may represent any interface that is necessary for communication with other network elements.
  • the processor 510 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 500 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • the memory 520 may include one or more non-volatile memories and one or more volatile memories.
  • the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 524, an electrically programmable read only memory (EPROM) , a flash memory, a hard disk, a compact disc (CD) , a digital video disk (DVD) , and other magnetic storage and/or optical storage.
  • the volatile memories include, but are not limited to, a random access memory (RAM) 522 and other volatile memories that will not last in the power-down duration.
  • a computer program 530 includes computer executable instructions that are executed by the associated processor 510.
  • the program 530 may be stored in the ROM 524.
  • the processor 510 may perform any suitable actions and processing by loading the program 530 into the RAM 522.
  • the embodiments of the present disclosure may be implemented by means of the program 530 so that the device 500 may perform any process of the disclosure as discussed with reference to Figs. 2 and 3.
  • the embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.
  • the program 530 may be tangibly contained in a computer readable medium which may be included in the device 500 (such as in the memory 520) or other storage devices that are accessible by the device 500.
  • the device 500 may load the program 530 from the computer readable medium to the RAM 522 for execution.
  • the computer readable medium may include any types of tangible non-volatile storage, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like.
  • Fig. 6 shows an example of the computer readable medium 600 in form of CD or DVD.
  • the computer readable medium has the program 530 stored thereon.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the method 300 or 400 as described above with reference to Figs. 3-4.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the computer program codes or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above.
  • Examples of the carrier include a signal, computer readable medium, and the like.
  • the computer readable medium may be a computer readable signal medium or a computer readable storage medium.
  • a computer readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the computer readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

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Abstract

Les modes de réalisation de la présente invention concernent un procédé, un dispositif, un appareil et un support de stockage lisible par ordinateur de retour d'informations d'état de canal (CSI). Le premier dispositif exécute les étapes consistant à : déterminer un premier indicateur d'un premier mode de CSI sur la base d'une mesure actuelle d'un canal entre le premier dispositif et un second dispositif ; déterminer un second indicateur d'un second mode de CSI au moins en partie sur la base d'un précédent retour de CSI ; et sélectionner parmi le premier mode de CSI et le second mode de CSI un mode de CSI cible permettant un retour de CSI actuel sur la base du premier indicateur et du second indicateur. Cette conception dynamique d'un retour de CSI explicite permet un compromis entre les performances d'un système et la charge utile d'un retour de CSI, en particulier pour un système New Radio, grâce à une commutation flexible entre différents modes de CSI. Ainsi est-il possible d'obtenir un allègement d'une charge utile de CSI et un gain d'un débit moyen de cellule.
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