Channel state information transmission method and apparatus, and storage medium

Abstract

The application provides a channel state information transmission method, device and storage medium. The channel state information transmission method comprises the following steps: measuring CMR sent by at least two base stations, obtaining joint CSI of at least two base stations associated with MTRP and independent CSI of at least two base stations associated with STRP, and the joint CSI comprises CSI elements corresponding to the at least two base stations; determining selected CSI corresponding to each base station according to the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station; and sending the joint CSI to the at least two base stations, and determining whether to send the independent CSI corresponding to each base station to the base station according to the relationship between the selected CSI corresponding to each base station and the independent CSI.

Description

Technical Field

[0001] This invention relates to mobile communication technology, and for example to a method, apparatus and storage medium for transmitting channel state information. Background Technology

[0002] In 5G New Radio (NR), the time and frequency resources controlled by the base station (gNB) can be used by user equipment (UE) to report Channel State Information (CSI). CSI can consist of a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Channel State Information Reference Signal (CSI-RS) Resource Indicator (CRI), a Synchronization Signal / Physical Broadcast Channel (SS / PBCH) Block Resource Indicator (SSBRI), a Layer Indicator (LI), and a Rank Indicator (RI).

[0003] To flexibly support CSI acquisition in different scenarios and using different methods, NR supports flexible CSI-RS configuration. Base stations can flexibly configure the number of CSI-RS resources, measurement methods, and other information according to the required CSI acquisition scheme. When there is only one CSI-RS resource, the terminal feeds back CSI values ​​such as RI, PMI, and CQI based on the measurement of this single CSI-RS resource. When there are multiple CSI-RS resources, the CSI-RS are usually pre-coded, with each CSI-RS resource representing a pre-coding matrix. The pre-coding information used for the CSI-RS can be preset by the base station under certain conditions. The terminal measures these CSI-RS, selects the best one, feeds back the CRI indicating that resource, and further feeds back CSI values ​​such as RI, PMI, and CQI based on the measurement of that resource.

[0004] However, when the existing CSI configuration framework supports transmission of multiple transmission receiving points (MTRPs), the terminal needs to simultaneously measure and transmit the CSI associated with the MTRP and the CSI associated with the single transmission receiving point (STRP), which incurs significant overhead. Summary of the Invention

[0005] This application provides a channel state information transmission method, apparatus, and storage medium, which aims to take into account the capabilities of the terminal, determine the corresponding CSI reporting principles, reduce the overhead and computational complexity of channel state information, and reduce mutual interference between the transport layers of MTRP, thereby enhancing the accuracy of the base station and the terminal in obtaining channel state information.

[0006] In a first aspect, embodiments of this application provide a channel state information transmission method, including:

[0007] Measure the CMR transmitted by at least two base stations to obtain the joint CSI of at least two base stations associated with the MTRP, and the independent CSI of each of the at least two base stations associated with the STRP. The joint CSI includes the CSI elements corresponding to the at least two base stations respectively.

[0008] The selected CSI for each base station is determined based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station.

[0009] Send a joint CSI to at least two base stations, and determine whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI for each base station.

[0010] Secondly, embodiments of this application provide a channel state information transmission method, including:

[0011] The CSI sent by the receiving terminal includes joint CSI or joint CSI and independent CSI. The joint CSI is obtained by the terminal after measuring the CMR sent by at least two base stations associated with the MTRP. The joint CSI includes the CSI elements corresponding to at least two base stations respectively. The independent CSI is obtained by the terminal after measuring the CMR sent by the base station associated with the STRP.

[0012] The received joint CSI is used as the joint CSI associated with the MTRP;

[0013] The received independent CSIs are treated as independent CSIs of the associated STRP, and the CSI elements corresponding to the unreceived independent CSIs in the joint CSI are treated as independent CSIs of the associated STRP.

[0014] Thirdly, embodiments of this application provide a channel state information transmission apparatus, comprising:

[0015] The channel measurement module is used to measure the CMR transmitted by at least two base stations, obtain the joint CSI of at least two base stations associated with the MTRP, and the independent CSI of each of the at least two base stations associated with the STRP. The joint CSI includes the CSI elements corresponding to the at least two base stations respectively.

[0016] The CSI selection module is used to determine the selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station.

[0017] The CSI feedback module is used to send joint CSI to at least two base stations, and to determine whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI for each base station.

[0018] Fourthly, embodiments of this application provide a channel state information transmission apparatus, comprising:

[0019] The CSI receiving module is used to receive CSI sent by the terminal. CSI includes joint CSI or joint CSI and independent CSI. Joint CSI is obtained by the terminal after measuring the CMR sent by at least two base stations associated with the MTRP. Joint CSI includes CSI elements corresponding to at least two base stations respectively. Independent CSI is obtained by the terminal after measuring the CMR sent by the base station associated with the STRP.

[0020] The CSI determination module is used to use the received joint CSI as the joint CSI of the associated MTRP; to use the received independent CSI as the independent CSI of the associated STRP; and to use the CSI element corresponding to the unreceived independent CSI in the joint CSI as the independent CSI of the associated STRP.

[0021] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for a channel state information transmission method in any possible implementation of the first or second aspect. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating an application scenario of the channel state information transmission method provided in the embodiments of this application.

[0023] Figure 2 A flowchart illustrating a channel state information transmission method provided in this application embodiment;

[0024] Figure 3 This is a schematic diagram of the MAC-CE structure;

[0025] Figure 4 A flowchart illustrating another channel state information transmission method provided in this application embodiment;

[0026] Figure 5 A schematic diagram of a channel state information transmission device provided in an embodiment of this application;

[0027] Figure 6 A schematic diagram of a channel state information transmission device provided in an embodiment of this application;

[0028] Figure 7 This is a schematic diagram of the structure of a terminal provided in an embodiment of this application;

[0029] Figure 8 This is a schematic diagram of the structure of a base station provided in an embodiment of this application. Detailed Implementation

[0030] The embodiments of this application will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of this application and not intended to limit it. It should be noted that, unless otherwise specified, the embodiments and features described herein can be arbitrarily combined with each other. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure.

[0031] In the embodiments of this application, the terms "optionally" or "exemplarily" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "optionally" or "exemplarily" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "optionally" or "exemplarily" is intended to present the relevant concepts in a specific manner.

[0032] To flexibly support CSI acquisition in different scenarios and using different methods, NR supports flexible CSI-RS configuration. Base stations can flexibly configure the number of CSI-RS resources, measurement methods, and other information according to the required CSI acquisition scheme. A base station can assign one or more CSI-RS resources for useful channel measurement and one or more CSI-IM resources for interference measurement to a specific terminal. There is a one-to-one correspondence between CSI-RS resources and Channel State Information Interference Measurement (CSI-IM) resources. When there is only one CSI-RS resource, the terminal feeds back CSI metrics such as RI, PMI, and CQI based on the measurement of that single CSI-RS resource. When there are multiple CSI-RS resources, they are typically pre-coded. Each CSI-RS resource represents a precoding matrix. The precoding information for the CSI-RS can be preset by the base station under certain conditions, such as traversing the Discrete Fourier Transform (DFT) beamforming vectors across the entire space, or being calculated based on measurements of the Sounding Reference Signal (SRS). The terminal measures these CSI-RS and selects the best one, feeding back the CRI indicating that resource, and further feeding back CSI values ​​such as RI, PMI, and CQI based on the measurements of that resource. The base station may assign one CSI-RS resource for useful channel measurement and one or more CSI-RS resources for interference measurement to a terminal. In this case, the useful channel measurement resource is associated with all interference measurement resources. In CSI-RS interference measurement resources, each CSI-RS antenna port corresponds to one layer of interference. The channel matrix measured by the terminal on multiple antenna ports of each CSI-RS interference resource is the interference channel matrix. The terminal can further calculate the covariance matrix, null space, etc. of the interference channel using this matrix to calculate and feedback the optimal precoding matrix and CQI under the interference channel. However, the existing CSI configuration framework has an excessively large codebook search range in supporting MTRP transmission, resulting in high complexity, and there is a certain degree of mutual interference between data transmission layers.

[0033] Figure 1 This is a schematic diagram illustrating an application scenario of the channel state information transmission method provided in the embodiments of this application. Figure 1The diagram illustrates communication between two Transmission Receiving Points (TRPs) (TRP1 and TRP2) and a terminal. TRP1 and TRP2 can be either devices on the base station side. The base station can flexibly configure the number of Channel Measurement Reference Signal (CMR) resources and the measurement method, etc. Figure 1 As shown, the TRP (e.g., TRP1, TRP2) can transmit one or more CSI-RS resources to the terminal via beamforming. Furthermore, the TRP can configure one or more CSI reporting settings (CSI-ReportConfig) and one or more CSI resource settings (CSI-ResourceConfig) for the terminal; a CSI reporting setting can be linked to up to three CSI resource settings. The terminal calculates the CSI by measuring these reference signal resources and reports it to the base station. The following embodiments all use... Figure 1 The scenario shown is used as an example for illustration, but the number of TRPs is not the same. Figure 1 For the purposes of this application, in the embodiments of this application, the channel state information transmission method provided in the embodiments of this application can be applied to two or more TRPs.

[0034] Figure 2 A flowchart of a channel state information transmission method provided in this application embodiment is shown below. Figure 2 As shown, the channel state information transmission method provided in this embodiment includes:

[0035] Step S210: Measure the CMR transmitted by at least two base stations to obtain the joint CSI of at least two base stations associated with the MTRP, and the independent CSI of each of the at least two base stations associated with the STRP. The joint CSI includes the CSI elements corresponding to at least two base stations respectively.

[0036] The channel state information transmission method provided in this embodiment is applied to the terminal side, based on... Figure 1In the scenario shown, when the base station supports MTRP transmission, the terminal needs to measure the CMRs sent by at least two base stations associated with the MTRP. The CSI-RS resources of these at least two base stations can be one or more, and there will be some interference at the transport layer of these at least two base stations. Therefore, the CMRs of these at least two base stations need to be measured and then jointly processed to obtain the joint CSI of the at least two base stations. The joint CSI includes the CSI elements corresponding to each of the at least two base stations. For example, the joint CSI could be [CSI_m1, CSI_m2], where CSI_m1 is the CSI element corresponding to TRP1, and CSI_m2 is the CSI element corresponding to TRP2. Simultaneously, the terminal also needs to measure the independent CSIs of each of the at least two base stations associated with the STRP, which are the CSIs used when each base station communicates independently with the terminal.

[0037] Both the joint CSI and the independent CSI can include any parameter used to represent channel state information, such as RI, CQI, PMI, CRI, SSBRI, LI, etc. This application uses RI and PMI as examples for illustration.

[0038] Step S220: Determine the selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station.

[0039] After the terminal measures and obtains the joint CSI of at least two base stations and the independent CSI of each base station, sending both the joint CSI and the independent CSI to each base station would incur significant overhead. Therefore, in this embodiment, the joint CSI and independent CSI are analyzed and processed to determine their sharing relationship. When mapping CSI in the Uplink Control Information (UCI) field, since the CSI in the MTRP may be shared in the STRP, the CSI associated with the MTRP has a higher priority than the CSI associated with the STRP. Therefore, in this embodiment, the CSI elements corresponding to each base station in the joint CSI associated with the MTRP are compared with the independent CSIs corresponding to each base station to determine whether the CSI elements corresponding to each base station in the joint CSI can be shared as independent CSIs corresponding to each base station. The independent CSI actually used by each base station can be called the selected CSI. The selected CSI can be the independent CSI corresponding to each base station measured by the terminal, or it can be the CSI element corresponding to the base station in the joint CSI.

[0040] Specifically, joint CSIs and independent CSIs can have different sharing strategies, which can be determined based on different system configurations. For example, the independent CSI corresponding to each base station can be used as the selected CSI for each base station, or the relationship between the CSI elements corresponding to each base station in the joint CSI and the independent CSIs corresponding to each base station can be used to determine whether to use the CSI elements corresponding to each base station in the joint CSI as the selected CSI for each base station. In this case, one or more of the CSI elements of each base station in the joint CSI can be shared as the selected CSI for each base station. Generally, by comparing the relationship between the CSI elements corresponding to each base station in the joint CSI and the independent CSIs corresponding to each base station, if the independent CSI is superior to the CSI elements, the independent CSI is used as the selected CSI for each base station; otherwise, the CSI elements in the joint CSI are shared as the selected CSI for each base station.

[0041] In this embodiment, the joint CSI, including a joint RI and a joint PMI, and the independent CSI, including an independent RI and an independent PMI, are used as examples for explanation. Specifically, the size of the RI element corresponding to each base station in the joint RI and the size of the independent RI corresponding to each base station can be used to determine whether to share the RI element in the joint RI as the selected RI for each base station. If the independent RI corresponding to a base station is greater than the RI element corresponding to the base station in the joint RI, then the independent RI and independent PMI corresponding to the base station are used as the selected RI and selected PMI for the base station. If the independent RI corresponding to a base station is less than or equal to the RI element corresponding to the base station in the joint RI, then the RI element corresponding to the base station in the joint RI and the PMI corresponding to the base station in the joint PMI are used as the selected RI and selected PMI for the base station.

[0042] Furthermore, since there will be some interference at the transport layer of at least two base stations, codewords that will generate significant interference in the codebook can be calculated. This codebook can then be restricted using a combined Codebook Subset Restriction (CBSR) from at least two base stations to obtain the restricted PMI. Specifically, for the combined PMI, the codebook is restricted using combined CBSR signaling from at least two base stations; for the independent PMI, the codebook is restricted using CBSR signaling from each base station. Further, the combined PMI is obtained by restricting the codebook in bitmap form using combined CBSR signaling from at least two base stations; the independent PMI is obtained by restricting the codebook in bitmap form using CBSR signaling from each base station. CBSR signaling is higher-layer signaling. For example, if multiple antenna ports are configured on each TRP, in a type I single-panel multi-antenna codebook, the higher-layer signaling typeI-SinglePanel-ri-Restriction restricts the rank in bitmap form. When there are 2 antenna ports, the codebook is restricted in bitmap form using the higher-layer signaling `twoTX-CodebookSubsetRestriction`. When there are more than 2 antenna ports, the codebook is restricted in bitmap form using the higher-layer signaling `n1-n2-TypeI-SinglePanel-Restriction` and `typeI-SinglePanel-codebookSubsetRestriction-i2`. Restricting the Rank and precoding matrix through higher-layer signaling reduces mutual interference between transport layers in the MTRP. Restricting the codebook limits the system's search range, thereby reducing computational complexity.

[0043] Step S230: Send a joint CSI to at least two base stations, and determine whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI corresponding to each base station.

[0044] After determining the selected CSIs for each base station, the terminal can feed back the CSIs to each base station. First, the terminal needs to send a joint CSI to at least two base stations. Then, based on the selected CSIs for each base station determined in step S220, the terminal determines whether to send the corresponding independent CSIs to each base station. If the terminal determines that the selected CSI for a base station is an independent CSI for that base station, then the terminal needs to send the corresponding independent CSI to the base station. If the terminal determines that the selected CSI for a base station is a CSI element for that base station in the joint CSI, then the terminal can send the corresponding independent CSI to the base station or not send the corresponding independent CSI to the base station according to a policy. On the base station side, when it receives the independent CSI sent by the terminal, the base station uses the received independent CSI as the CSI for the associated STRP. If the base station does not receive the independent CSI sent by the terminal, then the base station uses the corresponding CSI element in the received joint CSI as the CSI for the associated STRP.

[0045] Additionally, before measuring the CMRs transmitted by at least two base stations, the process includes receiving CMR pairing information indicated by reserved bit resources in the Media Access Control Control Element (MAC-CE) of the base station. For example, in this... Figure 1 In the scenario shown, assume that K1 CMRs are configured in TRP1 on the base station side, and K2 CMRs are configured in TRP2. This includes N pairs of CMR pairings, with each pair originating from a different TRP. The TRPs indicate the N pairs of CMR pairings to the terminal using reserved bits in the MAC-CE.

[0046] Specifically, Figure 3This is a schematic diagram of the MAC-CE structure, where R represents reserved bit resources. Serving Cell ID and BWP ID refer to the control channel (CC) and bandwidth part (BWP) index of the Physical Downlink Shared Channel (PDSCH) to which this MAC-CE will apply. Transmission Configuration Index state (TCI state) IDi indicates the TCI of the i-th resource within the SP CSI-RS resource set. A / D indicates whether the corresponding resource set in the MAC-CE is active or deactivated. The MAC-CE is carried on either the Physical Downlink Shared Channel or the Physical Downlink Control Channel. The base station uses the reserved resources of the MAC-CE to indicate the number N of paired CMRs in the MTRP. The terminal obtains the CMR pairing information N by detecting the Physical Downlink Shared Channel or the Physical Downlink Control Channel.

[0047] The channel state information transmission method provided in this embodiment involves a terminal measuring the CMRs sent by at least two base stations to obtain the joint CSI of at least two base stations associated with the MTRP and the independent CSIs of each of the at least two base stations associated with the STRP. The joint CSI includes CSI elements corresponding to at least two base stations. Then, based on the CSI elements corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station, the selected CSI corresponding to each base station is determined. Finally, the joint CSI is sent to at least two base stations, and the relationship between the selected CSI and the independent CSI corresponding to each base station is used to determine whether to send the corresponding independent CSI to each base station. This method establishes the principle of CSI reporting when MTRP transmission is supported, which can reduce the overhead and computational complexity of channel state information.

[0048] The following section details the sharing strategies for different joint CSIs and independent CSIs.

[0049] 1. In the case where RI and CBSR are not shared, in this embodiment, it is assumed that K1 CMRs are configured in TRP1 on the base station side, and K2 CMRs are configured in TRP2. This includes N pairs of CMR pairings, with each pair of CMRs coming from a different TRP.

[0050] Specifically, for TRP1 and TRP2 associated with MTRP, the terminal side calculates the CMR transmitted by the base station to obtain a joint RI pair, denoted as [RI_m1, RI_m2]. Furthermore, since there is some interference at the transport layer of TRP1 and TRP2, codewords that will generate significant interference in the codebook can be calculated. This is then used to restrict the codebook by combining the CBSR signaling of TRP1 and TRP2, denoted as [CBSR_m1, CBSR_m2], resulting in a restricted codebook [PMI_m1, PMI_m2]. Finally, the terminal reports the [RI_m1, RI_m2] and [PMI_m1, PMI_m2] information to the base station.

[0051] Furthermore, for TRP1 associated with the STRP, the terminal side calculates the CMR transmitted by the base station and obtains one RI, denoted as RI_s1. Then, through the CBSR signaling of TRP1, denoted as CBSR_s1, the codebook is restricted to obtain the restricted codebook PMI_s1. Finally, the terminal reports the RI_s1 and PMI_s1 information to TRP1.

[0052] Furthermore, for TRP2 associated with STRP, the terminal side calculates the CMR transmitted by the base station and obtains one RI, denoted as RI_s2. Then, through the CBSR signaling of TRP2, denoted as CBSR_s2, the codebook is restricted to obtain the restricted codebook PMI_s2. Finally, the terminal reports the RI_s2 and PMI_s2 information to TRP2.

[0053] II. Scenario where RI may be shared but CBSR may not: In this embodiment, it is assumed that K1 CMRs are configured in TRP1 on the base station side, and K2 CMRs are configured in TRP2. This includes N pairs of CMR pairings, with each pair of CMRs originating from a different TRP.

[0054] Specifically, for TRP1 and TRP2 associated with MTRP, the terminal side calculates the CMR transmitted by the base station to obtain a joint RI pair, denoted as [RI_m1, RI_m2]. Furthermore, since there is some interference at the transport layer of TRP1 and TRP2, codewords that will generate significant interference in the codebook can be calculated. This is then used to restrict the codebook by combining the CBSR signaling of TRP1 and TRP2, denoted as [CBSR_m1, CBSR_m2], resulting in a restricted codebook [PMI_m1, PMI_m2]. Finally, the terminal reports the [RI_m1, RI_m2] and [PMI_m1, PMI_m2] information to the base station.

[0055] Furthermore, for TRP1 associated with the STRP, the terminal side calculates the CMR transmitted by the base station and obtains one RI, denoted as RI_s1. Then, through the CBSR signaling of TRP1, denoted as CBSR_s1, the codebook is restricted to obtain the restricted codebook PMI_s1. If RI_s1 is greater than RI_m1, the terminal reports the RI_s1 and PMI_s1 information to TRP1. If RI_s1 is less than or equal to RI_m1, the terminal reports the PMI_s1 information to TRP1, and TRP1 shares RI_m1 in the MTRP.

[0056] Furthermore, for TRP2 associated with the STRP, the terminal side calculates the CMR transmitted by the base station and obtains one RI, denoted as RI_s2. Then, through the CBSR signaling of TRP2, denoted as CBSR_s2, the codebook is restricted to obtain the restricted codebook PMI_s2. If RI_s2 is greater than RI_m2, the terminal reports the RI_s2 and PMI_s2 information to TRP2. If RI_s2 is less than or equal to RI_m2, the terminal reports the PMI_s2 information to TRP2, and TRP2 shares RI_m2 in MTRP.

[0057] III. Scenario where RI and CBSR may be shared: In this embodiment, it is assumed that K1 CMRs are configured in TRP1 on the base station side, and K2 CMRs are configured in TRP2. This includes N pairs of CMR pairings, with each pair of CMRs originating from a different TRP.

[0058] Specifically, for TRP1 and TRP2 associated with MTRP, the terminal side calculates the CMR transmitted by the base station to obtain a joint RI pair, denoted as [RI_m1, RI_m2]. Furthermore, since there is some interference at the transport layer of TRP1 and TRP2, codewords that will generate significant interference in the codebook can be calculated. This is then used to restrict the codebook by combining the CBSR signaling of TRP1 and TRP2, denoted as [CBSR_m1, CBSR_m2], resulting in a restricted codebook [PMI_m1, PMI_m2]. Finally, the terminal reports the [RI_m1, RI_m2] and [PMI_m1, PMI_m2] information to the base station.

[0059] Furthermore, for TRP1 associated with the STRP, the terminal side calculates the CMR transmitted by the base station and obtains one RI, denoted as RI_s1. Then, through the CBSR signaling of TRP1, denoted as CBSR_s1, the codebook is restricted to obtain the restricted codebook PMI_s1. If RI_s1 is greater than RI_m1, the terminal reports the RI_s1 and PMI_s1 information to TRP1. If RI_s1 is less than or equal to RI_m1, TRP1 shares the RI_m1 and PMI_m1 information from the MTRP.

[0060] Furthermore, for TRP2 associated with the STRP, the terminal side calculates the CMR transmitted by the base station and obtains one RI, denoted as RI_s2. Then, through the CBSR signaling of TRP2, denoted as CBSR_s2, the codebook is restricted to obtain the restricted codebook PMI_s2. If RI_s2 is greater than RI_m2, the terminal reports the RI_s2 and PMI_s2 information to TRP2. If RI_s2 is less than or equal to RI_m2, TRP2 shares the RI_m2 and PMI_m2 information from MTRP.

[0061] IV. Cases where RI and CBSR may be shared: In this embodiment, it is assumed that K1 CMRs are configured in TRP1 on the base station side, and K2 CMRs are configured in TRP2. This includes N pairs of CMR pairings, with each pair of CMRs coming from different TRPs.

[0062] Specifically, for TRP1 and TRP2 associated with MTRP, the terminal side calculates the CMR transmitted by the base station to obtain a joint RI pair, denoted as [RI_m1, RI_m2]. Furthermore, since there is some interference at the transport layer of TRP1 and TRP2, codewords that will generate significant interference in the codebook can be calculated. This is then used to restrict the codebook by combining the CBSR signaling of TRP1 and TRP2, denoted as [CBSR_m1, CBSR_m2], resulting in a restricted codebook [PMI_m1, PMI_m2]. Finally, the terminal reports the [RI_m1, RI_m2] and [PMI_m1, PMI_m2] information to the base station.

[0063] Furthermore, for TRP1 associated with STRP, the terminal side obtains one RI by calculating the CMR transmitted by the base station side, denoted as RI_s1. Then, through the CBSR signaling of TRP1, denoted as CBSR_s1, the codebook is restricted to obtain the restricted codebook PMI_s1.

[0064] Furthermore, for TRP2 associated with STRP, the terminal side obtains one RI by calculating the CMR transmitted by the base station side, denoted as RI_s2. Then, through the CBSR signaling of TRP2, denoted as CBSR_s2, the codebook is restricted to obtain the restricted codebook PMI_s2.

[0065] If RI_s1 is less than or equal to RI_m1 and RI_s2 is less than or equal to RI_m2, TRP1 shares the RI_m1 and PMI_m1 information in MTRP, and TRP2 shares the RI_m2 and PMI_m2 information in MTRP.

[0066] Otherwise, the terminal reports the RI_s1 and PMI_s1 information to TRP1, and the RI_s2 and PMI_s2 information to TRP2.

[0067] Compared to the third scenario, the fourth scenario incurs less overhead.

[0068] Figure 4 A flowchart of another channel state information transmission method provided in the embodiments of this application is shown below. Figure 4 As shown, the channel state information transmission method provided in this embodiment includes:

[0069] Step S410: Receive the CSI sent by the terminal. The CSI includes joint CSI or joint CSI and independent CSI. The joint CSI is obtained by the terminal after measuring the CMR sent by at least two base stations associated with the MTRP. The joint CSI includes CSI elements corresponding to at least two base stations respectively. The independent CSI is obtained by the terminal after measuring the Channel Measurement Reference Signal (CMR) sent by the base station associated with the STRP.

[0070] The channel state information transmission method provided in this embodiment is applied to the base station side, based on... Figure 1In the scenario depicted, when the base station supports MTRP transmission, at least two base stations associated with the MTRP need to send CMRs. The terminal needs to measure the CMRs sent by the base stations associated with the MTRP from at least two base stations. The CSI-RS resources of the at least two base stations can be one or more, and there will be some interference at the transport layer of the at least two base stations. Therefore, it is necessary to measure the CMRs of the at least two base stations and then perform joint processing to obtain the joint CSI of the at least two base stations. The joint CSI includes the CSI elements corresponding to the at least two base stations respectively. For example, the joint CSI is [CSI_m1, CSI_m2], where CSI_m1 is the CSI element corresponding to TRP1, and CSI_m2 is the CSI element corresponding to TRP2. Simultaneously, the terminal also needs to measure the independent CSIs of each of the at least two base stations associated with the STRP, which are the CSIs used when each base station communicates independently with the terminal. The joint CSI and independent CSIs can include any parameter used to represent channel state information, such as RI, CQI, PMI, CRI, SSBRI, LI, etc. In this application, RI and PMI are used as examples for illustration.

[0071] After the terminal measures the joint CSI of at least two base stations and the independent CSI of each base station, sending both the joint CSI and the independent CSI to each base station would incur significant overhead. Therefore, the terminal analyzes and processes the joint CSI and the independent CSI to determine their sharing relationship. When mapping CSI in the UCI domain, since CSIs in the MTRP may be shared in the STRP, CSIs associated with the MTRP have a higher priority than those associated with the STRP. Therefore, in this embodiment, the CSI elements corresponding to each base station in the joint CSI associated with the MTRP are compared with the independent CSIs corresponding to each base station to determine whether the CSI elements corresponding to each base station in the joint CSI can be shared as independent CSIs for each base station. The independent CSI actually used by each base station can be called the selected CSI. The selected CSI can be the independent CSI corresponding to each base station measured by the terminal, or it can be the CSI element corresponding to the base station in the joint CSI. Specifically, the joint CSI and the independent CSI can have different sharing strategies, which can be determined according to different system configurations. After the selected CSI for each base station is determined, the terminal can send the CSI back to each terminal. The base station will receive the CSI sent by the terminal. The CSI includes joint CSI or joint CSI and independent CSI.

[0072] Step S420: The received joint CSI is used as the joint CSI associated with the MTRP.

[0073] The base station will receive the joint CSI fed back by the base station and use it as the CSI associated with the MTRP.

[0074] Step S430: The received independent CSI is used as the independent CSI of the associated STRP, and the CSI element corresponding to the unreceived independent CSI in the joint CSI is used as the independent CSI of the associated STRP.

[0075] If the base station receives an independent CSI sent by the terminal, it will use it as the independent CSI of the associated STRP. If the base station does not receive an independent CSI sent by the terminal, the base station will combine the corresponding CSI element in the CSI as the independent CSI of the associated STRP.

[0076] The channel state information transmission method provided in this embodiment is... Figure 2 The processing scheme on the base station side corresponding to the channel state information transmission method shown has been implemented in [the document / relevant database]. Its specific implementation principles and technical effects are already [understood / explained]. Figure 2 The embodiments shown have been described in detail and will not be repeated here. The channel state information transmission method provided in this application only needs to determine whether to share the corresponding CSI element in the joint CSI based on the joint CSI and independent CSI fed back by the terminal on the base station side.

[0077] Furthermore, in Figure 4 In the illustrated embodiment, joint CSI includes joint RI and joint PMI, and independent CSI includes independent RI and independent PMI.

[0078] Furthermore, in Figure 4 In the illustrated embodiment, the CSI sent by the receiving terminal includes: the joint RI, joint PMI, independent RI, and independent PMI sent by the receiving terminal; the received independent CSI is used as the independent CSI of the associated STRP, and the CSI element corresponding to the unreceived independent CSI in the joint CSI is used as the independent CSI of the associated STRP, including: the received independent RI and independent PMI are used as the independent RI and independent PMI of the associated STRP.

[0079] Furthermore, in Figure 4 In the illustrated embodiment, the CSI sent by the receiving terminal includes: the joint RI, joint PMI, and independent PMI sent by the receiving terminal; the received independent CSI is used as the independent CSI of the associated STRP, and the CSI element corresponding to the unreceived independent CSI in the joint CSI is used as the independent CSI of the associated STRP, including: the received independent PMI is used as the independent PMI of the associated STRP, and the RI element corresponding to the joint CSI is used as the independent RI of the associated STRP.

[0080] Furthermore, in Figure 4In the illustrated embodiment, the CSI sent by the receiving terminal includes: the joint RI and joint PMI sent by the receiving terminal; taking the received independent CSI as the independent CSI of the associated STRP, and taking the CSI element corresponding to the unreceived independent CSI in the joint CSI as the independent CSI of the associated STRP, includes: taking the RI element corresponding to the joint CSI as the independent RI of the associated STRP, and taking the PMI element corresponding to the joint CSI as the independent PMI of the associated STRP.

[0081] Furthermore, in Figure 4 In the illustrated embodiment, the joint PMI is obtained by restricting the codebook through the joint CBSR signaling of at least two base stations; the independent PMI is obtained by restricting the codebook through the CBSR signaling of each base station.

[0082] Furthermore, in Figure 4 In the embodiment shown, the joint PMI is obtained by restricting the codebook in the form of a bitmap using CBSR signaling from at least two base stations; the independent PMI is obtained by restricting the codebook in the form of a bitmap using CBSR signaling from each base station; CBSR signaling is higher-layer signaling.

[0083] Furthermore, in Figure 4 In the embodiment shown, before receiving the joint RI, joint PMI and independent PMI sent by the receiving terminal, the method further includes: using the reserved bit resources in MAC-CE to send the indicated CMR pairing information to the terminal.

[0084] Figure 5 This is a schematic diagram of a channel state information transmission device provided in an embodiment of this application. The channel state information transmission device provided in this embodiment is disposed in a terminal, such as... Figure 5 As shown, the channel state information transmission device provided in this embodiment includes: a channel measurement module 51, used to measure the CMR transmitted by at least two base stations to obtain the joint CSI of at least two base stations associated with the MTRP, and the independent CSI of each of the at least two base stations associated with the STRP, wherein the joint CSI includes CSI elements corresponding to at least two base stations respectively; a CSI selection module 52, used to determine the selected CSI corresponding to each base station based on the CSI elements corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station; and a CSI feedback module 53, used to send the joint CSI to at least two base stations, and determine whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI corresponding to each base station.

[0085] Figure 6 This is a schematic diagram of another channel state information transmission device provided in this application embodiment. The channel state information transmission device provided in this embodiment is installed in a base station, such as... Figure 6 As shown, the channel state information transmission device provided in this embodiment includes: a CSI receiving module 61, used to receive CSI sent by a terminal. The CSI includes joint CSI or joint CSI and independent CSI. The joint CSI is obtained by the terminal measuring the CMR sent by at least two base stations associated with the MTRP. The joint CSI includes CSI elements corresponding to at least two base stations respectively. The independent CSI is obtained by the terminal measuring the CMR sent by the base stations associated with the STRP. A CSI determining module 62 is used to use the received joint CSI as the joint CSI associated with the MTRP; use the received independent CSI as the independent CSI associated with the STRP; and use the CSI elements corresponding to the unreceived independent CSI in the joint CSI as the independent CSI associated with the STRP.

[0086] Figure 7 This is a schematic diagram of the structure of a terminal provided in an embodiment of this application, such as... Figure 7 As shown, the terminal includes a processor 71, a memory 72, a transmitter 73, and a receiver 74; the number of processors 71 in the terminal can be one or more. Figure 7 Taking a processor 71 as an example; the processor 71 and memory 72 in the terminal can be connected via a bus or other means. Figure 7 Taking the example of a connection between China and Israel via a bus.

[0087] The memory 72, as a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, as described in this application. Figure 2 The program instructions / modules corresponding to the channel state information transmission method in the embodiment (such as channel measurement module 51, CSI selection module 52, and CSI feedback module 53). The processor 71 executes the software programs, instructions, and modules stored in the memory 72 to perform at least one functional application and data processing, thereby implementing the above-described channel state information transmission method.

[0088] The memory 72 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the base station, etc. In addition, the memory 72 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0089] Transmitter 73 is a combination of modules or devices capable of transmitting radio frequency signals into space, such as a combination of radio frequency transmitters, antennas, and other devices. Receiver 74 is a combination of modules or devices capable of receiving radio frequency signals from space, such as a combination of radio frequency receivers, antennas, and other devices.

[0090] Figure 8 This application provides a schematic diagram of the structure of a base station, as shown in the embodiment of the present application. Figure 8 As shown, the base station includes a processor 81, a memory 82, a transmitter 83, and a receiver 84; the number of processors 81 in the base station can be one or more. Figure 8 Taking a processor 81 as an example; the processor 81 and memory 82 in the base station can be connected via a bus or other means. Figure 8 Taking the example of a connection between China and Israel via a bus.

[0091] The memory 82, as a computer-readable storage medium, can be configured to store software programs, computer-executable programs, and modules, as described in this application. Figure 4 The program instructions / modules (such as CSI receiving module 61 and CSI determining module 62) corresponding to the channel state information transmission method in the embodiment. The processor 81 executes the software programs, instructions and modules stored in the memory 82, thereby enabling at least one functional application and data processing of the base station, that is, implementing the above-mentioned channel state information transmission method.

[0092] The memory 82 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the base station. Furthermore, the memory 82 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0093] Transmitter 83 is a combination of modules or devices capable of transmitting radio frequency signals into space, such as a combination of radio frequency transmitters, antennas, and other devices. Receiver 84 is a combination of modules or devices capable of receiving radio frequency signals from space, such as a combination of radio frequency receivers, antennas, and other devices.

[0094] This application also provides a storage medium containing computer-executable instructions. When executed by a computer processor, the computer-executable instructions are used to perform a channel state information transmission method. The method includes: measuring the CMR transmitted by at least two base stations to obtain a joint CSI of at least two base stations associated with an MTRP and an independent CSI of each of the at least two base stations associated with a STRP. The joint CSI includes CSI elements corresponding to the at least two base stations respectively; determining a selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station; transmitting the joint CSI to at least two base stations, and determining whether to transmit the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI corresponding to each base station.

[0095] This application embodiment also provides a storage medium containing computer-executable instructions. When executed by a computer processor, the computer-executable instructions are used to perform a channel state information transmission method. The method includes: receiving CSI sent by a terminal, wherein the CSI includes joint CSI or joint CSI and independent CSI. The joint CSI is obtained by the terminal measuring the CMR sent by at least two base stations associated with an MTRP, and the joint CSI includes CSI elements corresponding to at least two base stations respectively. The independent CSI is obtained by the terminal measuring the CMR sent by base stations associated with a STRP. The received joint CSI is used as the joint CSI associated with the MTRP. The received independent CSI is used as the independent CSI associated with the STRP. The CSI elements corresponding to the unreceived independent CSI in the joint CSI are used as the independent CSI associated with the STRP.

[0096] Generally, the various embodiments of this application can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although this application is not limited thereto.

[0097] Embodiments of this application can be implemented by executing computer program instructions through the data processor of a mobile device, for example, in a processor entity, or through hardware, or through a combination of software and hardware. The computer program instructions can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0098] Any block diagram of logical flow in the accompanying drawings of this application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored on memory. Memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (Digital Video Disc (DVD) or Compact Disc (CD)), etc. Computer-readable media may include non-transitory storage media. Data processors may be of any type suitable to the local technical environment, such as, but not limited to, general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (SAICs), field-programmable gate arrays (FPGAs), and processors based on multi-core processor architectures.

Claims

1. A method for transmitting channel state information, characterized in that, include: Measure the Channel Measurement Reference Signals (CMRs) transmitted by at least two base stations to obtain the joint Channel State Information (CSI) of the at least two base stations associated with multiple Transmitter Receiver Points (MTRPs), and the independent CSI of each of the at least two base stations associated with a single Transmitter Receiver Point (STRP). The joint CSI includes the CSI elements corresponding to the at least two base stations respectively. The selected CSI for each base station is determined based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station; The joint CSI is sent to the at least two base stations, and the corresponding independent CSI is determined to be sent to each base station based on the relationship between the selected CSI and the independent CSI corresponding to each base station.

2. The method according to claim 1, characterized in that, The joint CSI includes a joint rank indicator (RI) and a joint precoding indicator (PMI), and the independent CSI includes an independent RI and an independent PMI.

3. The method according to claim 2, characterized in that, The step of determining the selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station includes: The independent RI corresponding to each base station is used as the selected RI corresponding to each base station, and the independent PMI corresponding to each base station is used as the selected PMI corresponding to each base station. The step of sending the joint CSI to the at least two base stations, and determining whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI for each base station, includes: The joint RI and the joint PMI are sent to the at least two base stations, and the corresponding independent RI and independent PMI are sent to each base station respectively.

4. The method according to claim 2, characterized in that, The step of determining the selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station includes: The independent RI and independent PMI of the first base station whose independent RI is greater than the corresponding RI element in the joint CSI are used as the selected RI and selected PMI of the first base station. The RI element and independent PMI of the second base station whose independent RI is less than or equal to the corresponding RI element in the joint CSI are used as the selected RI and selected PMI of the second base station. The step of sending the joint CSI to the at least two base stations, and determining whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI for each base station, includes: The joint RI and the joint PMI are sent to the at least two base stations, and the corresponding independent RI and independent PMI are sent to the first base station, and the corresponding independent PMI is sent to the second base station.

5. The method according to claim 2, characterized in that, The step of determining the selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station includes: The independent RI and independent PMI of the third base station that are greater than the corresponding RI element in the joint CSI are used as the selected RI and selected PMI of the third base station. The RI element and PMI element of the fourth base station that are less than or equal to the corresponding RI element in the joint CSI are used as the selected RI and selected PMI of the fourth base station. The step of sending the joint CSI to the at least two base stations, and determining whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI for each base station, includes: The joint RI and the joint PMI are sent to the at least two base stations, and the corresponding independent RI and independent PMI are sent to the third base station.

6. The method according to claim 2, characterized in that, The step of determining the selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station includes: When the independent RI of all base stations in the at least two base stations is less than or equal to the corresponding RI element in the joint CSI, the RI element and PMI element corresponding to each base station are used as the selected RI and selected PMI; otherwise, the independent RI and independent PMI corresponding to each base station are used as the selected RI and selected PMI of each base station. The step of sending the joint CSI to the at least two base stations, and determining whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI for each base station, includes: The joint RI and the joint PMI are sent to the at least two base stations.

7. The method according to any one of claims 2 to 6, characterized in that, The joint PMI is obtained by restricting CBSR signaling by combining a subset of the codebooks of the at least two base stations, and then restricting the codebooks. The independent PMI is obtained by restricting the codebook through CBSR signaling from each base station.

8. The method according to claim 7, characterized in that, The joint PMI is obtained by combining the CBSR signaling of the at least two base stations and restricting the codebook in the form of a bitmap; The independent PMI is obtained by restricting the codebook in the form of a bitmap through the CBSR signaling of each base station; The CBSR signaling is higher-level signaling.

9. The method according to any one of claims 1 to 6, characterized in that, Before measuring the CMR transmitted by at least two base stations, the method further includes: The base station receives CMR pairing information indicated by reserved bit resources in the Medium Access Control-Equipment (MAC-CE) unit.

10. A method for transmitting channel state information, characterized in that, include: The terminal receives Channel State Information (CSI) sent by the terminal. The CSI includes joint CSI or joint CSI and independent CSI. The joint CSI is obtained by the terminal after measuring the Channel Measurement Reference Signal (CMR) sent by at least two base stations associated with multiple Transmitter Receiver Points (MTRPs). The joint CSI includes CSI elements corresponding to the at least two base stations respectively. The independent CSI is obtained by the terminal after measuring the CMR sent by the base station associated with a single Transmitter Receiver Point (STRP). The received joint CSI is used as the joint CSI associated with the MTRP; The received independent CSIs are used as independent CSIs of the associated STRP, and the CSI elements corresponding to the unreceived independent CSIs in the joint CSI are used as independent CSIs of the associated STRP.

11. The method according to claim 10, characterized in that, The joint CSI includes a joint rank indicator (RI) and a joint precoding indicator (PMI), and the independent CSI includes an independent RI and an independent PMI.

12. The method according to claim 11, characterized in that, The CSI sent by the receiving terminal includes: Receive the joint RI, the joint PMI, the independent RI, and the independent PMI sent by the terminal; The step of using received independent CSIs as independent CSIs of the associated STRP, and using the corresponding CSI elements of unreceived independent CSIs in the joint CSI as independent CSIs of the associated STRP, includes: The received independent RI and independent PMI are used as the independent RI and independent PMI of the associated STRP.

13. The method according to claim 11, characterized in that, The CSI sent by the receiving terminal includes: Receive the joint RI, the joint PMI, and the independent PMI sent by the terminal; The step of using received independent CSIs as independent CSIs of the associated STRP, and using the corresponding CSI elements of unreceived independent CSIs in the joint CSI as independent CSIs of the associated STRP, includes: The received independent PMI is used as the independent PMI of the associated STRP, and the corresponding RI element in the joint CSI is used as the independent RI of the associated STRP.

14. The method according to claim 11, characterized in that, The CSI sent by the receiving terminal includes: Receive the joint RI and the joint PMI sent by the terminal; The step of using received independent CSIs as independent CSIs of the associated STRP, and using the corresponding CSI elements of unreceived independent CSIs in the joint CSI as independent CSIs of the associated STRP, includes: The corresponding RI element in the joint CSI is used as the independent RI of the associated STRP, and the corresponding PIM element in the joint CSI is used as the independent PMI of the associated STRP.

15. The method according to any one of claims 11 to 14, characterized in that, The joint PMI is obtained by restricting CBSR signaling by combining a subset of the codebooks of the at least two base stations, and then restricting the codebooks. The independent PMI is obtained by restricting the codebook through CBSR signaling from each base station.

16. The method according to claim 15, characterized in that, The joint PMI is obtained by combining the CBSR signaling of the at least two base stations and restricting the codebook in the form of a bitmap; The independent PMI is obtained by restricting the codebook in the form of a bitmap through the CBSR signaling of each base station; The CBSR signaling is higher-level signaling.

17. The method according to any one of claims 10 to 14, characterized in that, Before receiving the joint RI, the joint PMI, and the independent PMI sent by the terminal, the method further includes: The reserved bit resources in the Media Access Control Unit (MAC-CE) are used to send the indicated CMR pairing information to the terminal.

18. A channel state information transmission device, characterized in that, include: The channel measurement module is used to measure the channel measurement reference signals (CMR) transmitted by at least two base stations, obtain the joint channel state information (CSI) of the at least two base stations associated with multiple transmission receiver points (MTRPs), and the independent CSI of each of the at least two base stations associated with a single transmission receiver point (STRP). The joint CSI includes CSI elements corresponding to the at least two base stations respectively. The CSI selection module is used to determine the selected CSI for each base station based on the CSI element corresponding to each base station in the joint CSI and the independent CSI corresponding to each base station. The CSI feedback module is used to send the joint CSI to the at least two base stations, and to determine whether to send the corresponding independent CSI to each base station based on the relationship between the selected CSI and the independent CSI corresponding to each base station.

19. A channel state information transmission device, characterized in that, include: The Channel State Information (CSI) receiving module is used to receive CSI sent by the terminal. The CSI includes joint CSI or joint CSI and independent CSI. The joint CSI is obtained by the terminal after measuring the Channel Measurement Reference Signal (CMR) sent by at least two base stations associated with multiple Transmitter Receiver Points (MTRPs). The joint CSI includes CSI elements corresponding to the at least two base stations respectively. The independent CSI is obtained by the terminal after measuring the CMR sent by the base station associated with a single Transmitter Receiver Point (STRP). The CSI determination module is used to take the received joint CSI as the joint CSI associated with the MTRP; take the received independent CSI as the independent CSI associated with the STRP; and take the CSI element corresponding to the unreceived independent CSI in the joint CSI as the independent CSI associated with the STRP.

20. A computer-readable storage medium, characterized in that, The device stores computer-executable instructions for performing the channel state information transmission method according to any one of claims 1 to 17.

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