Search

JP-7855720-B2 - Feedback method, equipment, terminals, and network-side equipment for PMI in multi-TRP transmission

JP7855720B2JP 7855720 B2JP7855720 B2JP 7855720B2JP-7855720-B2

Inventors

  • 袁 江▲偉▼
  • 宋 ▲揚▼

Assignees

  • 維沃移動通信有限公司

Dates

Publication Date
20260508
Application Date
20230424
Priority Date
20220425

Claims (17)

  1. A feedback method for the precoding matrix instruction PMI of multi-transmit/receive point TRP transmission, The terminal determines a set of orthogonal beam groups corresponding to each TRP based on target parameters configured by the network side for a plurality of TRPs on which joint transmission is permitted, wherein the target parameters include a predetermined number of target orthogonal beams Li , which is a predetermined number of target orthogonal beams corresponding to TRP i. And, This is the number of the aforementioned TRPs, Based on the channel information of each TRP, a target orthogonal beam group corresponding to the TRP is selected from the set of orthogonal beam groups corresponding to each TRP, and a predetermined number of target orthogonal beams corresponding to each TRP are selected from the target orthogonal beam group. Determining a first feedback parameter for feeding back target orthogonal beam groups corresponding to a plurality of TRPs, and a second feedback parameter for feeding back a predetermined number of target orthogonal beams in each target orthogonal beam group, wherein the second feedback parameter includes a second number of combinations indicating the predetermined number of target orthogonal beams in each target orthogonal beam group. A method comprising the terminal transmitting a PMI parameter including the first feedback parameter and the second feedback parameter.
  2. The terminal determines the set of orthogonal beamgroups corresponding to each TRP based on target parameters configured by the network side for multiple TRPs in which joint transmission is permitted. To obtain the target parameters for each of the aforementioned TRPs, The process involves obtaining the values of the oversampling coefficients O1,i and O2 ,i corresponding to TRP i, based on the target parameters of TRP i and the instructions or preset information for upper layer signaling, wherein TRP i is the (i+1)th TRP among the plurality of TRPs. And, This is the number of the aforementioned TRPs, Based on the obtained oversampling coefficients O1,i and O2,i of the TRP i, an orthogonal beamgroup set having O1,i * O2 ,i orthogonal beamgroups corresponding to the TRP i is determined. The method according to claim 1, which includes obtaining
  3. The aforementioned target parameter is, The network side specifies the number of antenna ports configured on two dimensions of the same polarization for the TRP i, which are the port configuration parameters N1 ,i and N2 ,i , respectively. The port configuration parameters N1,i and N2 ,i , and the number of TRPs. The method according to claim 2, further comprising:
  4. To obtain the target parameters for each of the aforementioned TRPs, The number of TRPs based on the configured target information The method according to claim 3, comprising obtaining, wherein the target information includes one of channel measurement resource CMR and upper layer configuration signaling.
  5. To obtain the target parameters for each of the aforementioned TRPs, The network side obtains a set of target parameters uniformly configured for multiple TRPs, wherein the target parameters of the multiple TRPs are the same, or The method according to claim 3, comprising obtaining a set of target parameters configured for each of the TRPs by the network, wherein the target parameters for each of the TRP configurations are not exactly the same.
  6. The method according to claim 4, in the case of a set of target parameters uniformly configured by the network for each of the TRPs, the target parameters further include values of oversampling coefficients O1 and O2 , where O1,i = O1 and O2,i = O2 , corresponding to the TRP i.
  7. Based on the channel information of each TRP, selecting a target orthogonal beam group corresponding to each TRP from the set of orthogonal beam groups corresponding to each TRP, and selecting a predetermined number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group, Based on the channel information of TRP i, the orthogonal beam group number of TRP i and This involves obtaining the TRP i, where the TRP i is the (i+1)th TRP among the plurality of TRPs. And, This is the number of the aforementioned TRPs, and Based on the above, the orthogonal beam group set corresponding to TRP i To determine one of the target orthogonal beam groups in and The target orthogonal beam group includes N1,i * N2,i orthogonal beams, The method according to claim 2, comprising using the channel information of TRP i to obtain Li target orthogonal beams corresponding to TRP i from the target orthogonal beam group, wherein Li is a predetermined number of target orthogonal beams corresponding to TRP i.
  8. Before determining a first feedback parameter for feeding back target orthogonal beam groups corresponding to a plurality of TRPs, and a second feedback parameter for feeding back a predetermined number of target orthogonal beams in each target orthogonal beam group, the method: The number of the target orthogonal beam group corresponding to each of the TRPs is assigned a global number to obtain the numbering for all target orthogonal beam groups corresponding to multiple TRPs. The method further includes globally numbering the identifiers of the i target orthogonal beams corresponding to each TRP to obtain a numbering of the target orthogonal beams corresponding to a plurality of TRPs, wherein the identifier is the identifier of the target orthogonal beam in the target orthogonal beam group, and the identifier is a parameter and and and is an integer and and The method according to claim 7.
  9. The numbering of the target orthogonal beam group corresponding to each TRP is to assign a global numbering to each TRP. The beam orthogonal groups of the aforementioned TRP i are numbered q1 ,i and q2,i as q1 = (i * O 1,i ) + q1,i and q2 = q2 ,i, respectively. The beam orthogonal groups of the aforementioned TRP i are numbered q1 ,i and q2,i as q2 = (i * O2,i ) + q2,i and q1 = q1 ,i, respectively. The numbers q1 ,i and q2 ,i of the beam orthogonal groups of the aforementioned TRP i are given by q1 = The numbers are numbered as +q 1,i and q 2 = q 2,i , The numbers q1 ,i and q2 ,i of the beam orthogonal groups of the aforementioned TRP i are given by q2 = This includes one of the following: assigning numbers such as +q 2,i and q 1 = q 1,i . Here, This represents the oversampling coefficient of TRP k among the multiple TRPs, The identifiers of the i target orthogonal beams corresponding to each TRP are to be globally numbered. The parameter of one of the i target orthogonal beams of the TRP i. and The numbers for this target orthogonal beam are numbered as follows: To obtain, The parameter of one of the i target orthogonal beams of the TRP i. and The numbers for this target orthogonal beam are numbered as follows: To obtain, The parameter of one of the i target orthogonal beams of the TRP i. and The numbers for this target orthogonal beam are numbered as follows: To obtain, The parameter of one of the i target orthogonal beams of the TRP i. and The numbers for this target orthogonal beam are numbered as follows: To obtain one of these, Here, The method according to claim 8, wherein is a port configuration parameter of TRP k.
  10. A method for obtaining PMI in multi-TRP transmission, The network-side equipment instructs the terminal to specify target parameters for multiple TPRs that allow joint transmission, wherein the target parameters include a predetermined number of target orthogonal beams Li , which is a predetermined number of target orthogonal beams corresponding to TRP i. And, This is the number of the aforementioned TRPs, Receiving PMI parameters transmitted by the terminal, which include a first feedback parameter and a second feedback parameter, wherein the second feedback parameter includes a second combination number indicating a predetermined number of target orthogonal beams in each target orthogonal beam group. A method comprising the network-side device obtaining the PMI of each TRP based on the PMI parameters.
  11. The aforementioned target parameter is, The port configuration parameters N1 ,i and N2 ,i , respectively, are the number of antenna ports configured on two dimensions with the same polarization for TRP i on the network side. The port configuration parameters N1,i and N2 ,i , and the number of TRPs. It further includes, Here, TRP i is the (i+1)th TRP among the plurality of TRPs, The method according to claim 10.
  12. The network-side equipment instructs the terminal to specify the target parameters of multiple TPRs for which joint transmission is permitted. Based on the target information configured for the network-side device, the number of the multiple TRPs The method according to claim 11, comprising instructing, wherein the target information includes one of a channel measurement resource CMR and upper layer configuration signaling.
  13. The network-side equipment instructs the terminal to specify the target parameters of multiple TPRs for which joint transmission is permitted. The network-side device uniformly configures a set of target parameters for multiple TRPs and indicates that the target parameters of the multiple TRPs are the same, or The method according to claim 10, wherein each network-side device configures one set of target parameters for each of the TRPs and instructs each of the TRPs to configure one set of target parameters corresponding to each of the TRPs, wherein the target parameters configured for each of the TRPs are not exactly the same.
  14. A terminal comprising a processor and memory, wherein the memory stores a program or instruction that can be executed on the processor, and when the program or instruction is executed by the processor, the terminal implements a step of the PMI feedback method for multi-TRP transmission described in any one of claims 1 to 9.
  15. A network-side device comprising a processor and memory, wherein the memory stores a program or instruction that can be executed on the processor, and when the program or instruction is executed by the processor, the device realizes the steps of the method for acquiring the PMI of multi-TRP transmission described in any one of claims 10 to 13.
  16. A readable storage medium wherein a program or instruction is stored in the readable storage medium, and when the program or instruction is executed by a processor, a step of the PMI feedback method for multi-TRP transmission described in any one of claims 1 to 9 is realized .
  17. A readable storage medium wherein a program or instruction is stored in the readable storage medium, and when the program or instruction is executed by a processor, the steps of the method for acquiring the PMI of multi-TRP transmission described in any one of claims 10 to 13 are realized.

Description

(Cross-reference of related applications) This application claims priority to the Chinese patent application submitted to the Chinese National Patent Office on April 25, 2022, with application number 202210442243.5, titled "Feedback method for PMI in multi-TRP transmission, terminal and network-side equipment," and the Chinese patent application submitted to the Chinese National Patent Office on October 9, 2022, with application number 202211228519.6, titled "Feedback method for PMI in multi-TRP transmission, terminal and network-side equipment," and all contents of these applications are incorporated into this application by reference. This application belongs to the field of wireless communication technology, and specifically relates to a feedback method for precoding matrix indicators (PMI) in multi-transmission reception point (TRP) transmission, as well as terminals and network-side equipment. Coordinated Multipoint (CoMP) transmission refers to the coordinated participation of multiple geographically separated transmission and reception points (TRPs) in either transmitting data for a single terminal or collectively receiving data transmitted by a single terminal. The multiple transmission points participating in this cooperation generally refer to base stations in different cells. Through the cooperation of multiple cell base stations, interference signals can be utilized as useful signals, thereby reducing inter-cell interference and improving the system's spectral utilization rate. Each common CompM (Community Platform Processing) scheme can be classified into one of the following types: Joint Processing (JP), Collaborative Scheduling (CS), or Coordinated Beamforming (CB). Here, Joint Processing (JP) means that data from one terminal (User Equipment, UE) is available on one or more time-frequency resource points in the CoMP cooperation set, and includes the following: (1) Joint Transmission (JT). For example, simultaneously transmitting data from multiple points (part of a CoMP cooperation set or the entire CoMP cooperation set) to one UE or multiple UEs in one time-frequency resource. Or, simultaneously transmitting data from multiple points to a UE to improve, for example (coherently or uncoherently), the received signal quality and/or data throughput. (2) Dynamic Point Selection (DPS)/Frequency Modulation. Data transmission occurs from a single point (within a CoMP cooperation set) within a single time-frequency resource. The transmit/mix point can change from one subframe to another, including changes on Radio Bearer (RB) pairs within a single subframe. Data is available simultaneously on multiple points. Dynamic Point Selection/Frequency Modulation may include Dynamic Cell Selection (DCS). (3) A combination of DPS and JT. In such cases, data transmission can be performed by selecting multiple points from the time-frequency resource. Cooperative scheduling/beamforming (CS/CB) means that for a given time-frequency resource, UE data is available on only one point in the CoMP cooperation set and transmitted from this point (downlink (DL) data transmission starts from this point). However, the user scheduling/beamforming decision is made cooperatively among the points corresponding to the CoMP cooperation set. The selection of the launch point is semi-static, i.e., semi-static point selection (Semi-Persistent Point Selection, SSPS), meaning that the launch point can only be changed in a semi-static manner each time data is transmitted from one point to a specific UE. In related technologies, considering the overhead problem of precoding matrix indicator (PMI) feedback, the codebook design incorporates frequency domain compression, extends the number of supported ranks to four, and adds a distribution of non-zero coefficients that indicate PMI feedback using a Bitmap method. Here, the codebook generation for each layer may also be expressed by the following equation: Here, And, is, Dimension This represents the DFT beam vector, And here, The values are the same, and the polarization direction This is the amplitude coefficient, The values are the same, and the polarization direction This is the amplitude coefficient, , Tap beam These are the amplitude coefficient and phase coefficient corresponding to the following: And, is, Dimension This represents the DFT vector. When the terminal provides PMI feedback, , and Provides feedback on codebook coefficients to obtain or instruct. However, since the current codebook parameter definitions and parameter values are primarily based on the PMI of a single TRP, the PMI parameter feedback methods in related technologies are not applicable to scenarios where multiple TRPs cooperate in transmission. A block diagram of a wireless communication system to which the embodiments of this application can be applied is shown.A flowchart of the PMI feedback method for multi-TRP transmission according to the embodiment of this application is shown.A flowc