Precoding matrix indicator feedback method, terminal, and network side device

Abstract

The present application relates to the technical field of wireless communications, and discloses a precoding matrix indicator (PMI) feedback method, a terminal, and a network side device. The PMI feedback method in the embodiments of the present application comprises: a terminal acquires a plurality of PMIs; and on the basis of the plurality of PMIs, the terminal feeds back a CSI report to a network side device, wherein the CSI report is associated with the plurality of PMIs, and at least some target PMIs among the plurality of PMIs share a target non-zero coefficient indicator in the CSI report.

Description

Feedback method, terminal and network-side equipment for precoding matrix indication

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on August 16, 2023, with application number 202311039053.X and application name “Feedback method, terminal and network side device for precoding matrix indication”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of wireless communication technology, and specifically relates to a feedback method, terminal, and network-side device for precoding matrix indication. Background Art

[0003] Generally, the Channel State Information (CSI) architecture can be divided into two parts: downlink CSI and uplink CSI. The downlink CSI architecture includes downlink physical channels and downlink reference signals, while the uplink CSI architecture includes uplink physical channels and uplink reference signals.

[0004] The downlink physical channel is usually used to transmit data, and the downlink reference signal is usually used to perform channel estimation to obtain downlink channel state information (CSI). The uplink physical channel is usually used to transmit uplink data, and the uplink reference signal is usually used to perform channel estimation to obtain uplink channel state information (CSI).

[0005] In fifth-generation (5G) communication systems, CSI is primarily used in adaptive beamforming and multiple-input, multiple-output (MIMO) technologies to improve wireless transmission bandwidth and reliability. CSI can also be used for frequency reuse and interference coordination.

[0006] In general, the 5G CSI architecture is a very important technology in 5G communication systems, playing an important role in improving wireless transmission bandwidth and reliability and interference coordination.

[0007] In the current CSI architecture, a CSI report contains only one precoding matrix indicator (PMI), calculated based on a Type 2 codebook. However, in some cases, a CSI report may need to include multiple PMIs to associate multiple beam directions or multiple antenna panels. Reducing the overhead of CSI reporting when multiple PMIs are included in a CSI report is a technical issue that needs to be addressed.

[0008] Summary of the Invention

[0009] The embodiments of the present application provide a precoding matrix indication feedback method, a terminal, and a network-side device, which can reduce the overhead of a CSI report when multiple PMIs are included in one CSI report.

[0010] In a first aspect, a method for feedback of a precoding matrix indication is provided, including: a terminal obtains multiple PMIs; the terminal feeds back a channel state information CSI report to a network side device based on the multiple PMIs; wherein the CSI report is associated with the multiple PMIs, and at least some target PMIs among the multiple PMIs share a target non-zero coefficient indication in the CSI report.

[0011] In a second aspect, a method for obtaining a precoding matrix indication is provided, including: a network side device receives a CSI report fed back by a terminal, wherein the CSI report is associated with multiple PMIs, and at least some target PMIs among the multiple PMIs share a target non-zero coefficient indication in the CSI report; the network side device obtains the multiple PMIs based on the CSI report.

[0012] According to a third aspect, a feedback device for a precoding matrix indication is provided, comprising: a first acquisition module for acquiring a plurality of PMIs; a feedback module for feeding back a CSI report to a network-side device based on the plurality of PMIs; wherein the CSI report is associated with the plurality of PMIs, and at least some of the target PMIs among the plurality of PMIs share a target non-zero coefficient indication in the CSI report.

[0013] In a fourth aspect, a device for obtaining a precoding matrix indication is provided, including: a receiving module for receiving a CSI report fed back by a terminal, wherein the CSI report is associated with multiple PMIs, and at least some of the target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report; a second acquisition module for obtaining the multiple PMIs based on the CSI report.

[0014] In a fifth aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the first aspect are implemented.

[0015] In a sixth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the processor is used to implement the steps of the method described in the first aspect, and the communication interface is used to couple with the processor.

[0016] In the seventh aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the second aspect are implemented.

[0017] In an eighth aspect, a network side device is provided, comprising a processor and a communication interface, wherein the processor is used to implement the steps of the method described in the second aspect, and the communication interface is used to couple with the processor.

[0018] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented.

[0019] In the tenth aspect, a wireless communication system is provided, comprising: a terminal and a network side device, wherein the terminal can be used to execute the steps of the method described in the first aspect, and the network side device can be used to execute the steps of the method described in the second aspect.

[0020] In the eleventh aspect, a chip is provided, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the method as described in the first aspect, or to implement the method as described in the second aspect.

[0021] In the twelfth aspect, a computer program / program product is provided, which is stored in a storage medium and is executed by at least one processor to implement the steps of the feedback method of the precoding matrix indication as described in the first aspect, or to implement the steps of the acquisition method of the precoding matrix indication as described in the second aspect.

[0022] In an embodiment of the present application, when the terminal feeds back a CSI report, at least the target PMI among the multiple PMIs associated with the CSI report shares the target non-zero coefficient indication in the CSI report, thereby reducing the feedback overhead of the CSI report, improving the success rate of the CSI report feedback, and thereby improving the data transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 shows a block diagram of a wireless communication system to which embodiments of the present application may be applied;

[0024] FIG2 shows a schematic flow chart of a method for providing feedback of a precoding matrix indication according to an embodiment of the present application;

[0025] FIG3 a shows a schematic diagram of a non-zero coefficient indication of the first PMI in an embodiment of the present application;

[0026] FIG3 b shows a schematic diagram of a non-zero coefficient indication of the second PMI in an embodiment of the present application;

[0027] FIG4 is a schematic diagram showing a non-zero coefficient indication shared by a first PMI and a second PMI in an embodiment of the present application;

[0028] FIG5 is a schematic diagram showing a flow chart of a method for obtaining a precoding matrix indication according to an embodiment of the present application;

[0029] FIG6 shows a schematic structural diagram of a precoding matrix indication feedback device provided in an embodiment of the present application;

[0030] FIG7 shows a schematic structural diagram of a device for obtaining a precoding matrix indication according to an embodiment of the present application;

[0031] FIG8 shows a schematic structural diagram of a communication device provided in an embodiment of the present application;

[0032] FIG9 is a schematic diagram showing the hardware structure of a terminal provided in an embodiment of the present application;

[0033] FIG10 shows a schematic diagram of the hardware structure of a network-side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of this application to clearly describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0035] The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same type, and do not limit the number of objects, for example, the first object can be one or more. In addition, "or" in this application represents at least one of the connected objects. For example, "A or B" covers three options, namely, Option 1: including A but not including B; Option 2: including B but not including A; Option 3: including both A and B. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0036] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, the operation to be performed, or the requested result, etc. in the instruction sent; an indirect indication can be understood as the receiver determining the corresponding information based on the instruction sent by the sender, or making a judgment and determining the operation to be performed or the requested result, etc. based on the judgment result.

[0037] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the technology described can be used for the systems and radio technologies mentioned above, as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than NR systems, such as 6th generation (6G) systems. th Generation, 6G) communication system.

[0038] FIG1 is a block diagram of a wireless communication system applicable to an embodiment of the present application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile internet device (MID), an augmented reality (AR), a virtual reality (VR) device, a robot, a wearable device (Wearable Device), an aircraft (Flight Vehicle), a vehicle-mounted device (VUE), a ship-mounted device, a pedestrian user equipment (PUE), a smart home (home appliances with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), a game console, a personal computer (PC), an ATM, or a self-service machine, or other terminal-side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be called a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (WLAN) access point (AS) or a wireless fidelity (WiFi) node, etc.Among them, the base station can be referred to as Node B (NB), Evolved Node B (eNB), the next generation Node B (gNB), New Radio Node B (NR Node B), access point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B (home evolved Node B), Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0039] The core network equipment may include but is not limited to at least one of the following: core network node, core network function, mobility management entity (MME), access mobility management function (AMF), session management function (SMF), user plane function (UPF), policy control function (PCF), policy and charging rules function unit (PCRF), edge application service discovery function (EASDF), unified data management (UDM), unified data repository (UDR), home user server (HSS), centralized network configuration (CNC), network storage function (NRF), network exposure function (NEF), local NEF (L-NEF), binding support function (BSF), application function ( It should be noted that in the embodiments of the present application, only the core network device in the NR system is introduced as an example, and the specific type of the core network device is not limited.

[0040] In related technologies, CSI reporting can generally be configured as follows:

[0041] Periodic CSI (P-CSI): Transmitted only on the Physical Uplink Control Channel (PUCCH)

[0042] Semi-Persistent CSI (SP-CSI): Transmitted on the PUCCH or Physical Uplink Shared Channel (PUSCH). PUSCH-based SP-CSI reporting is activated and deactivated by the CSI Request field in the Downlink Control Information (DCI) signaling. Radio Resource Control (RRC) configures up to 64 trigger states, each corresponding to a CSI Report Setting. When acquiring CSI, the resource setting associated with each CSI Report Setting contains only one CSI-RS resource set.

[0043] Aperiodic CSI (AP-CSI): Transmitted only on the PUSCH. PUSCH-based AP-CSI reporting is activated by DCI signaling. RRC configures multiple trigger states, each corresponding to one or more CSI report settings. The CSI request field in the DCI triggers a trigger state. The CSI request field in DCI format 0_1 ​​is configured to a maximum of 6 bits, thus supporting a maximum of 64 CSI trigger states. When the number of CSI trigger states configured by RRC is greater than 64, the 64 trigger states are mapped to the CSI request field by the medium access control layer (MAC) control element (CE) signaling. Each CSI trigger state can be associated with 1 to 3 resource settings. If a resource setting contains multiple resource sets, only one resource set is selected. The quasi co-location (QCL) information of the CSI-RS resources in this resource set is configured for each resource by the transmission configuration indication (TCI) state.

[0044] CSI resource configuration (Resource Setting) can usually be as follows:

[0045] M ≥ 1 resource settings;

[0046] ●A resource configuration contains S ≥ 1 CSI-RS resource sets (Resource Set);

[0047] A resource set contains Ks ≥ 1 RS resources, such as channel measurement channel state information reference signal (CSI-Reference Signal, CSI-RS) / channel state information interference measurement (CSI-Interference measurement, CSI-IM) resources / interference measurement CSI-RS;

[0048] ●One CSI-RS resource is used to configure the number of CSI-RS ports and time-frequency position information, etc.; one CSI-IM resource is used to configure the time-frequency position information, etc. of the CSI-IM.

[0049] In addition, in the related art, generally, the terminal can determine the content included in the CSI report through high-layer signaling or default rules. For example, the high-layer signaling or default rules can indicate that the content of the CSI report includes: 'none', 'cri-ri-pmi-cqi', 'cri-RI-i1', 'cri-RI-CQI', 'cri-RSRP', 'cri-SINR', 'ssb-Index-RSRP', 'ssb-Index-SINR' or 'cri-RI-LI-PMI-CQI'.

[0050] If the terminal is configured with a CSI report configuration (CSI-ReportConfig) and the upper layer parameter report quantity (ReportQuantity) is set to "none", the terminal will not report anything for the CSI-ReportConfig.

[0051] For 'cri-ri-pmi-cqi' or 'cri-RI-LI-PMI-CQI', unless Non-Coherent Joint Transmission (NCJT) CSI is acquired, a CSI report generally contains only one CSI. For NCJT CSI, a CSI report may contain multiple CSIs. It is not ruled out that multiple CSIs may appear in a CSI report in the future.

[0052] Table 1. Rel-16eType2 codebook feedback amount

[0053] Table 1 shows the feedback amount and overhead of each PMI included in a CSI report in the related art. As shown in Table 1, the current CSI report only has one PMI calculated based on the Type2 codebook, and cannot support the situation where multiple PMIs are associated with multiple beam directions or multiple panels in a CSI report. Furthermore, for multiple PMIs, how to reduce the overhead of the CSI report, the current CSI architecture does not provide a solution. To address this problem, the embodiment of the present application provides a feedback scheme of precoding matrix indication to reduce the feedback overhead of the CSI report in the scenario where multiple PMIs are included in a CSI report.

[0054] The feedback scheme for precoding matrix indication provided by the embodiment of the present application is described in detail below with reference to some embodiments and application scenarios in conjunction with the accompanying drawings.

[0055] FIG2 illustrates a flow chart of a method for providing feedback of a precoding matrix indication in an embodiment of the present application. Method 200 may be executed by a terminal. In other words, the method may be executed by software or hardware installed on the terminal. As shown in FIG2 , the method may include the following steps.

[0056] S210: The terminal obtains multiple PMIs.

[0057] In specific applications, not limited to these, a terminal may measure at least one CSI reference signal based on the CSI reference signal configuration configured by a network-side device to obtain multiple PMIs. Alternatively, the terminal may measure at least one CSI reference signal port group to obtain multiple PMIs. Alternatively, the terminal may measure a single CSI reference signal to obtain multiple PMIs.

[0058] In the embodiment of the present application, optionally, each PMI may be associated with at least one CSI reference signal, or one CSI reference signal may be associated with at least one PMI.

[0059] S212: The terminal feeds back a CSI report to the network side device based on the multiple PMIs, wherein the CSI report is associated with the multiple PMIs, and at least some target PMIs in the multiple PMIs share a target non-zero coefficient indication in the CSI report.

[0060] The at least part of the target PMIs among the multiple PMIs may include all the PMIs among the multiple PMIs, or include part of the PMIs among the multiple PMIs.

[0061] In this embodiment of the present application, at least some of the target PMIs share the target non-zero coefficient indication in the CSI report, which means that any bit of the target non-zero coefficient indication is associated with one or more target PMIs in the at least some of the target PMIs, and at least one bit in the target non-zero coefficient indication is associated with multiple target PMIs. In other words, any bit of the target non-zero coefficient indication is used to indicate whether the coefficients corresponding to the one or more target PMIs associated with it are non-zero. The network-side device can obtain the non-zero coefficient indication associated with each target PMI through the target non-zero coefficient indication.

[0062] In a possible implementation, the terminal may determine which PMIs among the multiple PMIs the at least part of the target PMIs are based on network signaling, or the terminal may indicate to the network which PMIs among the multiple PMIs the at least part of the target PMIs are.

[0063] In a possible implementation, at least some of the target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report, which may be the target non-zero coefficient indication in the CSI report shared by the multiple PMIs.

[0064] Alternatively, in another possible implementation, the multiple PMIs may be divided into at least two PMI groups, and the target non-zero coefficient indication shared by at least some of the target PMIs in the multiple PMIs may be a first non-zero indication in the CSI report shared by the target PMIs in each PMI group. For example, for multi-transmission node (MTRP) PMI acquisition, multiple PMIs are associated with different transmission nodes (TRPs), respectively. The PMIs associated with the same TRP are grouped as one PMI, and the PMIs in each group share a non-zero coefficient indication in the CSI report.

[0065] In a possible implementation manner, each bit of the target non-zero coefficient indication is associated with at least one target PMI.

[0066] In this embodiment of the present application, optionally, the shared target non-zero coefficient indication satisfies one of the following:

[0067] (1) Each bit of the target non-zero coefficient indication is associated with at least one target PMI among the at least some target PMIs, and the number of target PMIs associated with each bit is the same; for example, each bit of the target non-zero coefficient indication is associated with the at least some target PMIs. For another example, each bit of the target non-zero coefficient indication is associated with two target PMIs, and the target PMIs associated with different bits may be the same or different.

[0068] (2) Each bit of the target non-zero coefficient indication is associated with at least one target PMI in the at least part of the target PMIs, and the number of target PMIs associated with each bit is not exactly the same. For example, at least one bit in the target non-zero coefficient indication is associated with the at least part of the target PMIs, and the remaining bits can be associated with one target PMI or multiple target PMIs in the at least part of the target PMIs. For another example, some bits in the target non-zero coefficient indication are associated with three target PMIs in the at least part of the target PMIs, some bits are associated with two target PMIs in the at least part of the target PMIs, and the remaining bits are associated with one target PMI.

[0069] Through the technical solution provided in the embodiments of the present application, when the terminal feeds back a CSI report, at least the target PMI among the multiple PMIs associated with the CSI report shares the target non-zero coefficient indication in the CSI report, thereby reducing the feedback overhead of the CSI report, improving the success rate of the CSI report feedback, and thereby improving the data transmission efficiency.

[0070] For example, in one implementation, the terminal feeds back multiple PMIs, each PMI being associated with all bits of a target non-zero coefficient indication. In this case, each bit of the target non-zero coefficient indication is associated with multiple PMIs. That is, if the terminal indicates that a bit in the target non-zero coefficient indication is 1, it indicates that the terminal has fed back the amplitude and / or phase indications of the coefficients of the multiple PMIs associated with that bit. Furthermore, the number of PMIs associated with each bit is equal to the number of PMIs fed back by the terminal. Furthermore, optionally, each bit of the target non-zero coefficient indication can be associated with one or more transmission layers; optionally, each bit of the target non-zero coefficient indication can also be associated with one or two polarization directions.

[0071] Alternatively, in another implementation, the terminal feeds back multiple PMIs, each PMI being associated with some bits of the target non-zero coefficient indication. One bit of the target non-zero coefficient indication may be associated with one or more PMIs. That is, if the terminal indicates that a bit in the target non-zero coefficient indication is 1, it indicates that the terminal has fed back the amplitude and / or phase indication of the coefficients of one or more PMIs associated with that bit. Furthermore, optionally, each bit of the target non-zero coefficient indication may be associated with one or more transmission layers; optionally, each bit of the target non-zero coefficient indication may also be associated with one or two polarization directions.

[0072] In one implementation, the target non-zero coefficient indication may include: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI of a transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of a transmission layer.

[0073] For example, in one implementation, a terminal feeds back a target non-zero coefficient indication associated with multiple PMIs. The target non-zero coefficient indication can be divided into two parts, wherein each bit in the first part of the non-zero coefficient indication is associated with the multiple PMIs. Each bit of the first part of the non-zero coefficient indication is associated with one transmission layer and multiple PMIs. That is, if the terminal indicates that a certain bit in the first part of the non-zero coefficient indication is 1, it indicates that the terminal has fed back the amplitude and / or phase indication of the coefficients of at least one PMI among the amplitude and / or phase indications of the coefficients of the multiple PMIs associated with the bit, or that there is at least one non-zero coefficient among the amplitude and / or phase indications of the coefficients of the multiple PMIs associated with the bit. For the second part of the non-zero coefficient indication, all bits with a value of 1 in the first part of the non-zero coefficient indication indicated by the terminal are associated (that is, indicating that the terminal has fed back the amplitude and / or phase indication of the coefficients of at least one PMI associated with the bit, or a bit indicating a non-zero coefficient). Each bit of the second part of the non-zero coefficient indication is associated with one transmission layer and one PMI. For each bit that is 1 in the first part of the non-zero coefficient indication, it is associated with multiple bits in the second part of the non-zero coefficient indication. The multiple bits of the second part of the non-zero coefficient indication are used to indicate whether the multiple coefficients associated with the 1 bits in the first part of the non-zero coefficient indication are non-zero coefficients (multiple coefficients are associated with multiple PMIs). Since the second part of the non-zero coefficients is only associated with the 1 bits in the first part of the non-zero coefficient indication, the overhead of the non-zero coefficient indication can be effectively reduced, thereby reducing the overhead of the PMI.

[0074] Alternatively, in another implementation, the terminal feeds back a target non-zero coefficient indication associated with multiple PMIs. The target non-zero coefficient indication can be divided into two parts. In the first part of the non-zero coefficient indication, each PMI is associated with a portion of its bits. In this case, each bit of the first part of the non-zero coefficient indication is associated with a transmission layer and at least one PMI. That is, if the terminal indicates that a bit in the first part of the non-zero coefficient indication is 1, it indicates that the terminal has fed back the amplitude and / or phase indication of the coefficients of one or more PMIs associated with the bit, or that the amplitude and / or phase indication of the coefficients of one or more PMIs associated with the bit contains at least one non-zero coefficient. For the second part of the non-zero coefficient indication, all bits in the first part of the non-zero coefficient indication indicated by the terminal that are 1 and are associated with the coefficients of multiple PMIs are associated. Each bit of the second part of the non-zero coefficient indication is associated with a transmission layer and a PMI. For each bit in the first part of the non-zero coefficient indication that is 1 and is associated with the coefficients of multiple PMIs, it is associated with multiple bits in the second part of the non-zero coefficient indication. Multiple bits are used to indicate whether multiple coefficients associated with bits set to 1 in the first part of non-zero coefficient indications are non-zero coefficients (multiple coefficients are associated with multiple PMIs). Since the second part of non-zero coefficients is associated only with bits set to 1 in the first part of non-zero coefficient indications and with bits of coefficients of multiple PMIs, the overhead of non-zero coefficient indications can be effectively reduced, thereby reducing the overhead of PMIs.

[0075] In one implementation, the target non-zero coefficient indication may include: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI, the target PMI is associated with at least one transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of one transmission layer.

[0076] For example, in one implementation, a terminal feeds back a target non-zero coefficient indication associated with multiple PMIs. The target non-zero coefficient indication can be divided into two parts. In the first part, each PMI is associated with all its bits. In this case, each bit of the first part is associated with multiple transmission layers and multiple PMIs. That is, if the terminal indicates that a bit in the first part of the non-zero coefficient indication is 1, it indicates that the terminal has fed back the amplitude and / or phase indication of the coefficients of the multiple PMIs associated with that bit (where each PMI coefficient is associated with multiple transmission layers), or that the amplitude and / or phase indication of the coefficients of the multiple PMIs associated with that bit contains at least one non-zero coefficient. For the second part of the non-zero coefficient indication, all bits that are 1 in the first part of the non-zero coefficient indication indicated by the terminal are associated. Each bit of the second part of the non-zero coefficient indication is associated with a transmission layer and a PMI. For each bit that is 1 in the first part of the non-zero coefficient indication, it is associated with multiple bits in the second part of the non-zero coefficient indication. Multiple bits are used to indicate whether the multiple coefficients associated with the 1 bits in the first part of the non-zero coefficient indication are non-zero coefficients (the multiple coefficients are associated with multiple PMIs and multiple transmission layers). Since the second part of the non-zero coefficients is only associated with the 1 bits in the first part of the non-zero coefficient indication, the overhead of the non-zero coefficient indication can be effectively reduced, thereby reducing the overhead of the PMI.

[0077] Alternatively, in another implementation, the terminal feeds back a target non-zero coefficient indication associated with multiple PMIs, and the target non-zero coefficient indication can be divided into two parts, wherein each PMI in the first part of the non-zero coefficient indication is associated with part of its bits, and in addition, each bit of the first part of the non-zero coefficient indication is associated with multiple transmission layers and at least one PMI, that is, if the terminal indicates that a certain bit in the first part of the non-zero coefficient indication is 1 and the bit is associated with coefficients of multiple PMIs (wherein the coefficients of each PMI are associated with multiple transmission layers), then the terminal indicates that among the amplitude and / or phase indications of the coefficients of all layers of the multiple PMIs associated with the bit, the terminal has fed back the amplitude and / or phase indication of the coefficients of at least one PMI, or indicates that among the amplitude and / or phase indications of the coefficients of all layers of the multiple PMIs associated with the bit, there is at least one non-zero coefficient. If a terminal indicates that a certain bit in the first portion of non-zero coefficient indications is 1 and is associated with a bit of coefficients of one PMI (where the coefficients of the PMI are associated with multiple transmission layers), this indicates that the terminal has fed back the amplitude and / or phase indication of the coefficients of at least one layer of the amplitude and / or phase indication of the coefficients of multiple layers associated with the PMI associated with the bit, or that there is at least one non-zero coefficient in the amplitude and / or phase indication of the coefficients of multiple layers associated with the bit. For the second portion of non-zero coefficient indications, all bits that are 1 in the first portion of non-zero coefficient indications indicated by the terminal are associated. Specifically, this may include bits that are 1 in the first portion of non-zero coefficient indications and are associated with the coefficients of multiple PMIs, and bits that are 1 in the first portion of non-zero coefficient indications and are associated with the coefficients of multiple transmission layers of the PMI. Each bit of the second portion of non-zero coefficient indications is associated with one transmission layer and one PMI. For each bit that is 1 in the first portion of non-zero coefficient indications and is associated with the coefficients of multiple PMIs, it is associated with multiple bits in the second portion of non-zero coefficient indications. Multiple bits are used to indicate whether the multiple coefficients associated with the 1 bits in the first part of the non-zero coefficient indication are non-zero coefficients (the multiple coefficients are associated with multiple PMIs and multiple transmission layers). Since the second part of the non-zero coefficients is associated only with the 1 bits in the first part of the non-zero coefficient indication and is associated with the bits of the coefficients of multiple PMIs, the overhead of the non-zero coefficient indication can be effectively reduced, thereby reducing the overhead of the PMI.

[0078] In one or more of the foregoing implementations, the number of bits indicated by the second portion of non-zero coefficients is determined by at least one of the following:

[0079] (1) Number of layers;

[0080] (2) the number of target PMIs;

[0081] (3) the number of bits whose median value is 1 in the first part of non-zero coefficient indicators;

[0082] (4) The first portion of non-zero coefficients indicates the number of non-zero coefficients indicated.

[0083] (5) the number of bits in the first part of the non-zero coefficient indication associated with multiple target PMIs and having a value of 1;

[0084] (6) The number of bits in the first part of the non-zero coefficient indication that are associated with one target PMI and have a value of 1.

[0085] Optionally, the terminal may feed back one or more of the number of bits with a value of 1 in the first part of the non-zero coefficient indication, the number of non-zero coefficients indicated by the first part of the non-zero coefficient indication, the number of bits associated with multiple PMIs and with a value of 1 in the first part of the non-zero coefficient indication, and the number of bits associated with 1 PMI and with a value of 1 in the first part of the non-zero coefficient indication to the network side device in the CSI report, for example, in Part 1 of the CSI report.

[0086] In one implementation, the amplitude quantized value associated with the first non-zero coefficient may include zero, wherein the first non-zero coefficient is one of the following: a non-zero coefficient indicated or associated by the target non-zero coefficient indication, or a non-zero coefficient indicated or associated by the first portion of non-zero coefficient indications. The non-zero coefficient indicated or associated by the target non-zero coefficient indication is at least one coefficient associated with a bit set to 1 in the target non-zero coefficient indication; and the non-zero coefficient indicated or associated by the first portion of non-zero coefficient indications is at least one coefficient associated with a bit set to 1 in the first portion of non-zero coefficient indications.

[0087] Optionally, for a coefficient whose amplitude is quantized to 0, the CSI report does not include the phase quantization result of the coefficient.

[0088] Optionally, the CSI report may include first indication information, where the first indication information is used to indicate the number of first non-zero coefficients whose amplitudes are quantized to 0. For example, Part 1 of the CSI report may include the number of coefficients whose amplitudes are quantized to 0.

[0089] Optionally, the CSI report includes second indication information, where the second indication information is used to indicate the number of bits in the target non-zero coefficient indication whose value is 1. For example, Part 1 of the CSI report includes the number of 1s in the target non-zero coefficient indication.

[0090] For example, in one implementation, a terminal feeds back target non-zero coefficient indicators associated with multiple PMIs. For bits associated with multiple PMIs in the target non-zero coefficient indicator, that is, if the terminal indicates that a certain bit in the target non-zero coefficient indicator is 1, and the terminal feeds back amplitude and / or phase indicators of the coefficients of the multiple PMIs associated with that bit, the amplitude of the coefficients may optionally be quantized to 0 to indicate to the network that some non-zero coefficients and some zero coefficients are present in the coefficients of the multiple PMIs associated with the bit whose non-zero coefficient indicator is 1. Optionally, for coefficients whose amplitudes are quantized to 0, the terminal does not feed back their associated phase indicators. Optionally, when the network device needs to obtain the size of Part 2 of the CSI report, since the terminal does not feed back the associated phase indicators for coefficients whose amplitudes are quantized to 0, the terminal may indicate the number of coefficients whose amplitudes are quantized to 0 in Part 1 of the CSI report. The network device uses this number and the number of bits in the target non-zero coefficient indicator that are 1 to determine the size of the amplitude and phase indicators fed back by the terminal, thereby determining the size of Part 2 of the CSI report.

[0091] In one implementation, the number of target PMIs associated with each bit of the target non-zero coefficient indication is equal to the number of PMIs fed back by the terminal.

[0092] In another implementation, the number of target PMIs associated with each bit of the target non-zero coefficient indication is related to a basis vector associated with each target PMI indicated by the terminal in the CSI report.

[0093] Optionally, in the case where M target PMIs out of N PMIs are associated with the same target basis vector, the number of target PMIs associated with each target bit indicated by the target non-zero coefficient is M, where the target bit is the bit associated with the target basis vector, M is less than or equal to N, and M and N are integers.

[0094] In another optional implementation, the terminal feeds back multiple PMIs, each PMI being associated with a portion of the bits of the target non-zero coefficient indication. One bit of the target non-zero coefficient indication may be associated with one PMI or multiple PMIs. That is, if a bit in the non-zero coefficient indication indicated by the terminal is 1, it indicates that the terminal has fed back the amplitude and / or phase indication of the coefficients of one or more PMIs associated with that bit.

[0095] At the same time, the terminal or network-side device needs to determine which bits are associated with one PMI, which bits are associated with multiple PMIs, or the number of PMIs associated with each bit.

[0096] Alternatively, a method for determining which bits are associated with one PMI and which bits are associated with multiple PMIs may include: the terminal or network-side device assumes that the number of PMIs associated with each bit is related to the basis vector associated with each PMI indicated by the terminal. Since each bit in the target non-zero coefficient indication is associated with at least one basis vector, for N PMIs fed back by the terminal, if M PMIs (M is less than or equal to N, and M / N is an integer) are associated with the same basis vector, then the bits in the target non-zero coefficient indication associated with the basis vector are associated with M PMIs.

[0097] In one implementation, the number of target PMIs associated with each bit of the target non-zero coefficient indication is related to a non-zero coefficient indication offset indicated by the terminal in the CSI report.

[0098] Optionally, the non-zero coefficient indicates that the offset satisfies one of the following:

[0099] (1) The CSI report is associated with a plurality of non-zero coefficient indication offsets, each of which is associated with a target PMI and a target transmission layer, and is used to indicate an offset of the non-zero coefficient indication associated with the target transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to a reference non-zero coefficient indication associated with the target transmission layer;

[0100] (2) The CSI report is associated with a plurality of non-zero coefficient indication offsets, each of which is associated with a target PMI and a plurality of transmission layers, and is used to indicate the offset of the non-zero coefficient indication of each transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to the reference non-zero coefficient indication associated with the transmission layer.

[0101] In the above optional implementation, the reference non-zero coefficient indication may be a default non-zero coefficient indication, for example, the coefficient of the first target PMI is the reference non-zero coefficient indication, or the CSI report may also include a reference non-zero coefficient indication.

[0102] For example, in one implementation, the terminal feeds back multiple PMIs, each PMI being associated with a portion of the bits of the target non-zero coefficient indication. One bit of the target non-zero coefficient indication may be associated with one PMI or multiple PMIs. That is, if a bit in the non-zero coefficient indication indicated by the terminal is 1, it indicates that the terminal has fed back the amplitude and / or phase indication of the coefficients of one or more PMIs associated with that bit.

[0103] Therefore, the terminal or the network-side device needs to determine which bits are associated with one PMI, which bits are associated with multiple PMIs, or the number of PMIs associated with each bit.

[0104] Optionally, a method for determining which bits are associated with one PMI and which bits are associated with multiple PMIs may include: the terminal or the network-side device assumes that the number of PMIs associated with each bit is related to a non-zero coefficient indication offset indicated by the terminal. Determining the offset requires first determining a reference PMI, and then obtaining the offset based on a reference non-zero coefficient indication associated with the reference PMI.

[0105] Optionally, the method for determining the reference PMI includes but is not limited to at least one of the following:

[0106] 1. The first PMI fed back is the reference PMI;

[0107] 2. The PMI associated with the first configured CSI reference signal is the reference PMI;

[0108] 3. The maximum channel quality indicator (CQI) associated PMI among multiple PMIs is used as the reference PMI;

[0109] 4. The PMI associated with the first CSI reference signal indicated in the CSI-RS indication (CRI) in the CSI report is the reference PMI;

[0110] 5. The terminal indicates in the CSI report which reference signal associated PMI is the reference PMI.

[0111] For the non-zero coefficient indication offset, optionally, the CSI report includes multiple non-zero coefficient indication offsets, each of the non-zero coefficient indication offsets is associated with a PMI and a transmission layer, or each of the non-zero coefficient indication offsets is associated with a PMI and multiple transmission layers.

[0112] Further, optionally, the non-zero coefficient indication offset of the terminal feedback is the number of PMIs fed back by the terminal minus one, or the number of PMIs multiplied by the number of transmission layers minus the number of transmission layers, or the number of PMIs multiplied by 2 multiplied by the number of transmission layers minus the number of transmission layers multiplied by 2 (where 2 represents 2 polarization directions).

[0113] Furthermore, optionally, the terminal feeds back a corresponding non-zero coefficient indication offset in Part 1 of the CSI report, and the network-side device further obtains the size of the target non-zero coefficient indication by obtaining the non-zero coefficient indication offset.

[0114] The non-zero coefficient indication offset can be an integer. Optionally, the minimum value of the non-zero coefficient indication offset is 0, and the maximum value can be the number of basis vectors configured by the network side device (for example, the number of spatial basis vectors, the number of frequency domain basis vectors, the number of Doppler domain basis vectors) or the number of basis vectors divided by K, where K is an integer greater than 1, for example, K=2. Optionally, the network side device can configure some candidate values, and the terminal can feedback the non-zero coefficient indication offset among these candidate values.

[0115] Alternatively, the size of the target non-zero coefficient indication is equal to the length of the non-zero coefficient indication sequence associated with the reference PMI (e.g., v i 2L i M i or v i 2L i M i Q i , where i indicates that the i-th PMI is the reference PMI, N indicates the number of PMIs fed back by the UE, and v i Indicates the rank number of the i-th PMI, L i Indicates the number of spatial basis vectors selected by the i-th PMI in a polarization direction, M i represents the number of frequency domain basis vectors selected by the i-th PMI, Q i (representing the number of Doppler domain basis vectors selected by the i-th PMI) plus the sum of the first values ​​associated with each other PMI, where the first value is (non-zero coefficient indication offset + 1) multiplied by the length of the non-zero coefficient indication sequence associated with a basis vector, wherein the basis vector is associated with the non-zero coefficient indication offset. Alternatively, when the non-zero coefficient indication offset is associated with a spatial basis vector, the first value is (non-zero coefficient indication offset + 1) multiplied by the length of the non-zero coefficient indication sequence associated with a spatial basis vector. The same applies to basis vectors in other domains.

[0116] For example, for layer 1 of one polarization direction of two CSIs, the associated non-zero coefficient indications are shown in Figures 3a and 3b, where different fill patterns represent selected frequency domain basis vectors, different shapes represent selected spatial domain basis vectors, and each graphic is associated with one bit of the non-zero coefficient indication.

[0117] If two CSIs are fed back independently, 50 bits are required. For the above-mentioned target non-zero coefficient indication, with the first CSI as a reference, the terminal feedbacks the non-zero coefficient indication offset of the associated spatial basis vector as 2. The target non-zero coefficient indication is shown in Figure 4, which is equivalent to the bit associated with the first spatial basis vector and the first frequency basis vector of the second CSI corresponding to the bit associated with the third spatial basis vector and the first frequency basis vector of the first CSI corresponding to one bit, the bit associated with the second spatial basis vector and the first frequency basis vector of the second CSI corresponding to the bit associated with the fourth spatial basis vector and the first frequency basis vector of the first CSI corresponding to one bit, and so on. The length of the above-mentioned offset non-zero coefficient indication is equal to (non-zero coefficient indication length of the first CSI <25 bits>) + (non-zero coefficient indication sequence length associated with offset 2 <5*(2+1)=15 bits>), a total of 35 bits, thereby reducing feedback overhead.

[0118] The aforementioned basic vectors may be at least one of the following:

[0119] 1. Spatial basis vector;

[0120] 2. Frequency domain basis vectors;

[0121] 3. Doppler domain basis vector;

[0122] 4. Spatial-frequency basis vector pairs;

[0123] 5. Spatial-Doppler domain basis vector pairs;

[0124] 6. Frequency domain-Doppler domain basis vector pairs.

[0125] In one implementation, the feedback priority of the second portion of non-zero coefficient indications is lower than the priority of the first portion of non-zero coefficient indications. That is, when the terminal maps the first portion of non-zero coefficient indications and the second portion of non-zero coefficient indications to uplink control information (UCI), the terminal prioritizes mapping the first portion of non-zero coefficient indications.

[0126] For example, in one implementation, a terminal feeds back a target non-zero coefficient indication associated with multiple PMIs. The target non-zero coefficient indication can be divided into two parts. The second part of the non-zero coefficient indication is associated with all bits in the first part of the non-zero coefficient indication that are set to 1. Each bit in the second part of the non-zero coefficient indication is associated with a transmission layer and a PMI. Multiple bits are used to indicate whether the multiple coefficients associated with the bits in the first part of the non-zero coefficient indication are non-zero coefficients (multiple coefficients are associated with multiple PMIs). The number of bits in the second part of the non-zero coefficient indication is related to at least one of the following: the number of layers; the number of PMIs; the number of 1s or the number of non-zero coefficients in the first part of the non-zero coefficient indication. Specifically, when the number of bits in the second part of the non-zero coefficient indication is related to the number of 1s or the number of non-zero coefficients in the first part of the non-zero coefficient indication, the terminal feeds back this number to the network in CSI report Part 1. Optionally, when the terminal maps the CSI report to UCI, the mapping priority of the second part of the non-zero coefficient indication is lower than that of the first part of the non-zero coefficient indication, i.e., the first part of the non-zero coefficient indication is mapped first, and then the second part of the non-zero coefficient indication is mapped.

[0127] Through the above technical solution provided by the embodiment of the present application, when there are multiple CSIs in a CSI report, the PMIs of the multiple CSIs share non-zero coefficient indications, which can effectively reduce the PMI feedback overhead and improve data transmission efficiency.

[0128] Based on the same technical concept, an embodiment of the present application also provides a method for obtaining a precoding matrix indication.

[0129] FIG5 illustrates a flow chart of a method for obtaining a precoding matrix indication according to an embodiment of the present application. Method 500 may be performed by a network-side device. In other words, the method may be performed by software or hardware installed on the network-side device. As shown in FIG5 , the method may include the following steps.

[0130] S510: A network-side device receives a CSI report fed back by a terminal, wherein the CSI report is associated with multiple PMIs, and at least some target PMIs among the multiple PMIs share a target non-zero coefficient indication in the CSI report.

[0131] The terminal may feed back the CSI report according to the method shown in FIG. 2 . For details, please refer to the relevant description in method 200 , which will not be repeated here.

[0132] S512: The network-side device obtains the multiple PMIs based on the CSI report.

[0133] Through the above technical solution provided by the embodiment of the present application, in the CSI report fed back by the terminal, at least some target PMs share non-zero coefficient indications, and the network side device can obtain multiple PMIs based on the CSI report, thereby reducing the PMI feedback overhead and improving data transmission efficiency.

[0134] It should be noted that method 500 is a method executed by the network-side device corresponding to method 200. Therefore, in the following embodiments, various implementation methods of the network-side device are mainly described. For other matters not covered, please refer to the relevant description in method 200.

[0135] In one implementation, at least some of the target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report, including one of the following:

[0136] The multiple PMIs share a target non-zero coefficient indication in the CSI report;

[0137] The multiple PMIs are divided into at least two PMI groups, and the PMIs in each PMI group share a target non-zero coefficient indication in the CSI report.

[0138] In one implementation, each bit of the target non-zero coefficient indication is associated with at least one target PMI.

[0139] In the above implementation, optionally, the shared target non-zero coefficient indication satisfies one of the following:

[0140] (1) The number of target PMIs associated with each bit of the target non-zero coefficient indication is the same; for example, at least part of the target PMIs are associated with each bit of the target non-zero coefficient indication.

[0141] (2) The number of target PMIs associated with each bit of the target non-zero coefficient indication is not exactly the same. For example, the at least some target PMIs are associated with some bits of the target non-zero coefficient indication, that is, each of the some bits in the target non-zero coefficient indication is associated with the at least some target PMI, and the remaining bits are associated with one or more target PMIs in the at least some target PMI.

[0142] In one implementation, before S510, the method may further include: the network-side device sending a first higher-layer signaling to the terminal, where the first higher-layer signaling indicates one of the following:

[0143] (1) Each bit of the shared target non-zero coefficient indication is associated with at least part of the target PMI;

[0144] (2) The shared portion of bits indicating the target non-zero coefficients is associated with at least a portion of the target PMI.

[0145] In one implementation, the target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI of a transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of a transmission layer.

[0146] In one implementation, the target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI, the target PMI is associated with at least one transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of one transmission layer.

[0147] In one implementation, before S510, the method may further include: the network side device sends a second high-layer signaling to the terminal, wherein the second high-layer signaling is used to configure whether the target non-zero coefficient indication includes a first part of non-zero coefficient indication and a second part of non-zero coefficient indication.

[0148] In one implementation, the number of bits indicated by the second portion of non-zero coefficients is determined by at least one of the following:

[0149] Number of layers;

[0150] The number of target PMIs;

[0151] The number of bits having a median value of 1 in the first portion of non-zero coefficient indications;

[0152] The first portion of non-zero coefficients indicates the number of indicated non-zero coefficients;

[0153] The number of bits in the first part of non-zero coefficient indications associated with multiple target PMIs and having a value of 1;

[0154] The number of bits in the first part of non-zero coefficient indications that are associated with one target PMI and have a value of 1.

[0155] Optionally, the CSI report may further include the number of bits with a value of 1 in the first part of non-zero coefficient indications or the number of non-zero coefficients indicated by the first part of non-zero coefficient indications.

[0156] In one implementation, the CSI report includes first indication information, where the first indication information is used to indicate the number of first non-zero coefficients whose amplitudes are quantized to zero.

[0157] In one implementation, the CSI report includes second indication information, where the second indication information is used to indicate the number of bits whose value is 1 in the target non-zero coefficient indication.

[0158] In one implementation, the number of target PMIs associated with each bit of the target non-zero coefficient indication is equal to the number of PMIs fed back by the terminal; or, the number of target PMIs associated with each bit of the target non-zero coefficient indication is related to the basis vectors associated with each target PMI indicated by the terminal in the CSI report.

[0159] In one implementation, the number of target PMIs associated with each bit of the target non-zero coefficient indication is related to a non-zero coefficient indication offset indicated by the terminal in the CSI report.

[0160] In one implementation, before S510, the method may further include: the network side device configures multiple non-zero coefficient indication offsets for the terminal, used to instruct the terminal to select at least one non-zero coefficient indication offset from the multiple non-zero coefficient indication offsets, and obtain the target non-zero coefficient indication based on the non-zero coefficient indication offset.

[0161] In one implementation, after S510, the method may further include: the network side device obtains an indication of at least one non-zero coefficient indication offset associated with the CSI report fed back by the terminal, and obtains the length of the target non-zero coefficient indication fed back by the terminal through the at least one indication.

[0162] In one implementation, the non-zero coefficient indicates that the offset satisfies one of the following:

[0163] (1) The CSI report is associated with a plurality of non-zero coefficient indication offsets, each of which is associated with a target PMI and a target transmission layer, and is used to indicate an offset of the non-zero coefficient indication associated with the target transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to a reference non-zero coefficient indication associated with the target transmission layer;

[0164] (2) The CSI report is associated with a plurality of non-zero coefficient indication offsets, each of which is associated with a target PMI and a plurality of transmission layers, and is used to indicate the offset of the non-zero coefficient indication of each transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to the reference non-zero coefficient indication associated with the transmission layer.

[0165] Through the above technical solution provided by the embodiment of the present application, the network side device can obtain multiple PMIs from the terminal by compressing the CSI report of multiple PMI overhead feedback, thereby effectively reducing the PMI feedback overhead and improving data transmission efficiency.

[0166] The feedback method for precoding matrix indication provided in the embodiment of the present application can be performed by a feedback device for precoding matrix indication. In the embodiment of the present application, the feedback method for precoding matrix indication performed by the feedback device for precoding matrix indication is taken as an example to illustrate the feedback device for precoding matrix indication provided in the embodiment of the present application.

[0167] FIG6 shows a schematic structural diagram of a precoding matrix indication feedback device provided in an embodiment of the present application. As shown in FIG6 , the device 600 mainly includes: a first acquisition module 601 and a feedback module 602 .

[0168] In the embodiment of the present application, the first acquisition module 601 is configured to acquire multiple PMIs;

[0169] A feedback module 602 is configured to feed back a CSI report to a network-side device based on the multiple PMIs;

[0170] The CSI report is associated with the multiple PMIs, and at least some target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report.

[0171] In one implementation, at least some of the target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report, including one of the following:

[0172] The multiple PMIs share a target non-zero coefficient indication in the CSI report;

[0173] The multiple PMIs are divided into at least two PMI groups, and the target PMIs in each PMI group share a target non-zero coefficient indication in the CSI report.

[0174] In one implementation, each bit of the target non-zero coefficient indication is associated with at least one target PMI.

[0175] In one implementation, the shared target non-zero coefficient indication includes one of the following:

[0176] The number of target PMIs associated with each bit indicated by the target non-zero coefficient is the same;

[0177] The number of target PMIs associated with each bit indicated by the target non-zero coefficient is not exactly the same.

[0178] In one implementation, the target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI of a transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of a transmission layer.

[0179] In one implementation, the target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI, the target PMI is associated with multiple transmission layers, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of one transmission layer.

[0180] In one implementation, the number of bits indicated by the second portion of non-zero coefficients is determined by at least one of the following:

[0181] Number of layers;

[0182] The number of target PMIs;

[0183] The number of bits having a median value of 1 in the first portion of non-zero coefficient indications;

[0184] The first portion of non-zero coefficients indicates the number of indicated non-zero coefficients;

[0185] The number of bits in the first part of non-zero coefficient indications associated with multiple target PMIs and having a value of 1;

[0186] The number of bits in the first part of non-zero coefficient indications that are associated with one target PMI and have a value of 1.

[0187] In one implementation, the amplitude quantization value associated with the first non-zero coefficient includes zero, wherein the first non-zero coefficient is one of the following: the non-zero coefficient indicated or associated by the target non-zero coefficient indication, and the non-zero coefficient indicated or associated by the first part of the non-zero coefficient indication.

[0188] In one implementation, the CSI report includes first indication information, where the first indication information is used to indicate the number of first non-zero coefficients whose amplitudes are quantized to zero.

[0189] In one implementation, the CSI report includes second indication information, where the second indication information is used to indicate the number of bits whose value is 1 in the target non-zero coefficient indication.

[0190] In one implementation, the number of target PMIs associated with each bit of the target non-zero coefficient indication is equal to the number of PMIs fed back by the terminal; or, the number of target PMIs associated with each bit of the target non-zero coefficient indication is related to the basis vectors associated with each target PMI indicated by the terminal in the CSI report.

[0191] In one implementation, when M target PMIs among N PMIs are associated with the same target basis vector, the number of target PMIs associated with each target bit indicated by the target non-zero coefficient is M, where the target bit is the bit associated with the target basis vector, M is less than or equal to N, and M and N are integers.

[0192] In one implementation, the number of the target PMIs associated with each bit of the target non-zero coefficient indication is related to a non-zero coefficient indication offset indicated by the terminal in the CSI report.

[0193] In one implementation, the non-zero coefficient indicates that the offset satisfies one of the following:

[0194] A plurality of non-zero coefficient indication offsets are associated in the CSI report, each of the non-zero coefficient indication offsets being associated with one target PMI and a target transmission layer, and being used to indicate an offset of a non-zero coefficient indication associated with the target transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to a reference non-zero coefficient indication associated with the target transmission layer;

[0195] The CSI report is associated with multiple non-zero coefficient indication offsets, each of which is associated with a target PMI and multiple transmission layers, and is used to indicate the offset of the non-zero coefficient indication of each transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to the reference non-zero coefficient indication associated with the transmission layer.

[0196] In one implementation, the feedback priority of the second part of non-zero coefficient indications is lower than the priority of the first part of non-zero coefficient indications.

[0197] The feedback device for the precoding matrix indication in the embodiment of the present application can be an electronic device, such as an electronic device with an operating system, or a component in the electronic device, such as an integrated circuit or chip. The electronic device can be a terminal or other device other than a terminal. For example, the terminal can include but is not limited to the types of terminal 11 listed above, and other devices can be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0198] The feedback device for precoding matrix indication provided in the embodiment of the present application can implement each process implemented by the terminal of the method embodiment of Figure 2 and achieve the same technical effect. To avoid repetition, it will not be described here.

[0199] FIG7 shows a schematic structural diagram of a device for obtaining a precoding matrix indication provided in an embodiment of the present application. As shown in FIG7 , the device 700 mainly includes: a receiving module 701 and a second obtaining module 702 .

[0200] In this embodiment of the present application, the receiving module 701 is configured to receive a CSI report fed back by a terminal, wherein the CSI report is associated with multiple PMIs, and at least some target PMIs among the multiple PMIs share a target non-zero coefficient indication in the CSI report;

[0201] The second acquisition module 702 is configured to acquire the multiple PMIs based on the CSI report.

[0202] In one implementation, at least some of the target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report, including one of the following:

[0203] The multiple PMIs share a target non-zero coefficient indication in the CSI report;

[0204] The multiple PMIs are divided into at least two PMI groups, and the PMIs in each PMI group share a target non-zero coefficient indication in the CSI report.

[0205] In one implementation, each bit of the target non-zero coefficient indication is associated with at least one target PMI.

[0206] In one implementation, the shared target non-zero coefficient indication includes one of the following:

[0207] The number of target PMIs associated with each bit indicated by the target non-zero coefficient is the same;

[0208] The number of target PMIs associated with each bit indicated by the target non-zero coefficient is not exactly the same.

[0209] In one implementation, the system further includes: a sending module, configured to send a first high-layer signaling to the terminal, wherein the first high-layer signaling indicates one of the following:

[0210] Each bit of the shared target non-zero coefficient indication is associated with the at least part of the target PMI;

[0211] The shared portion of bits indicating the target non-zero coefficients is associated with the at least portion of the target PMI.

[0212] In one implementation, the target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI of a transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of a transmission layer.

[0213] In one implementation, the target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI, the target PMI is associated with multiple transmission layers, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of one transmission layer.

[0214] In one implementation, it further includes: a sending module, configured to send a second high-layer signaling to the terminal, wherein the second high-layer signaling is used to configure whether the target non-zero coefficient indication includes a first part of non-zero coefficient indications and a second part of non-zero coefficient indications.

[0215] In one implementation, the number of bits indicated by the second portion of non-zero coefficients is determined by at least one of the following:

[0216] Number of layers;

[0217] The number of target PMIs;

[0218] The number of bits having a median value of 1 in the first portion of non-zero coefficient indications;

[0219] The first portion of non-zero coefficients indicates the number of indicated non-zero coefficients;

[0220] The number of bits in the first part of non-zero coefficient indications associated with multiple target PMIs and having a value of 1;

[0221] The number of bits in the first part of non-zero coefficient indications that are associated with one target PMI and have a value of 1.

[0222] In one implementation, the CSI report includes first indication information, where the first indication information is used to indicate the number of first non-zero coefficients whose amplitudes are quantized to zero.

[0223] In one implementation, the CSI report includes second indication information, where the second indication information is used to indicate the number of bits whose value is 1 in the target non-zero coefficient indication.

[0224] In one implementation, the number of target PMIs associated with each bit of the target non-zero coefficient indication is equal to the number of PMIs fed back by the terminal; or, the number of target PMIs associated with each bit of the target non-zero coefficient indication is related to the basis vectors associated with each target PMI indicated by the terminal in the CSI report.

[0225] In one implementation, the number of the target PMIs associated with each bit of the target non-zero coefficient indication is related to a non-zero coefficient indication offset indicated by the terminal in the CSI report.

[0226] In one implementation, it also includes: a configuration module, used to configure multiple non-zero coefficient indication offsets for the terminal, used to instruct the terminal to select at least one non-zero coefficient indication offset from the multiple non-zero coefficient indication offsets, and obtain the target non-zero coefficient indication based on the non-zero coefficient indication offset.

[0227] In one implementation, the second acquisition module 702 is also used by the network side device to obtain an indication of at least one non-zero coefficient indication offset associated with the CSI report fed back by the terminal, and obtain the length of the target non-zero coefficient indication fed back by the terminal through the at least one indication.

[0228] The apparatus for obtaining the precoding matrix indication provided in the embodiment of the present application can implement the various processes implemented by the terminal in the method embodiment of FIG5 and achieve the same technical effect. To avoid repetition, it will not be described here.

[0229] As shown in Figure 8, an embodiment of the present application further provides a communication device 800, including a processor 801 and a memory 802. The memory 802 stores a program or instruction that can be run on the processor 801. For example, when the communication device 800 is a terminal, the program or instruction is executed by the processor 801 to implement the various steps of the embodiment of the feedback method for the above-mentioned precoding matrix indication, and can achieve the same technical effect. When the communication device 800 is a network-side device, the program or instruction is executed by the processor 801 to implement the various steps of the embodiment of the method for obtaining the above-mentioned precoding matrix indication, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0230] An embodiment of the present application further provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps in the embodiment of the method for feedback of a precoding matrix indication as shown in FIG2 . This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment are applicable to this terminal embodiment and can achieve the same technical effects.

[0231] Specifically, FIG9 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application.

[0232] The terminal 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909 and at least some of the components of the processor 910.

[0233] Those skilled in the art will appreciate that the terminal 900 may also include a power supply (such as a battery) to power various components. The power supply may be logically connected to the processor 910 via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption. The terminal structure shown in FIG9 does not limit the terminal. The terminal may include more or fewer components than shown, or may combine certain components, or have different component arrangements, which will not be described in detail here.

[0234] It should be understood that in an embodiment of the present application, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042, and the graphics processing unit 9041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and at least one of other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and an operating stick, which will not be repeated here.

[0235] In the embodiment of the present application, after receiving downlink data from a network-side device, the RF unit 901 may transmit the data to the processor 910 for processing. Furthermore, the RF unit 901 may send uplink data to the network-side device. Typically, the RF unit 901 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and the like.

[0236] The memory 909 can be used to store software programs or instructions and various data. The memory 909 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, applications or instructions required for at least one function (such as a sound playback function, an image playback function, etc.). In addition, the memory 909 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM). The memory 909 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0237] Processor 910 may include one or more processing units. Optionally, processor 910 integrates an application processor and a modem processor. The application processor primarily handles operations related to the operating system, user interface, and application programs, while the modem processor primarily processes wireless communication signals, such as a baseband processor. It is understood that the modem processor may not be integrated into processor 910.

[0238] The processor 910 is configured to obtain multiple PMIs;

[0239] The radio frequency unit 901 is configured to feed back a CSI report to the network side device based on the multiple PMIs;

[0240] The CSI report is associated with the multiple PMIs, and at least some target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report.

[0241] Through the terminal provided in the embodiment of the present application, in the feedback CSI report, at least the target PMI among the multiple PMIs associated with the CSI report shares the target non-zero coefficient indication in the CSI report, thereby reducing the feedback overhead of the CSI report, improving the success rate of the CSI report feedback, and thereby improving the data transmission efficiency.

[0242] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of method embodiment 200 and achieve the same or corresponding technical effects. To avoid repetition, it will not be repeated here.

[0243] An embodiment of the present application further provides a network-side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to execute a program or instruction to implement the steps of the embodiment of the method for obtaining a precoding matrix indication as shown in FIG5 . This network-side device embodiment corresponds to the aforementioned network-side device method embodiment, and each implementation process and implementation method of the aforementioned method embodiment are applicable to this network-side device embodiment and can achieve the same technical effects.

[0244] Specifically, an embodiment of the present application also provides a network-side device. As shown in Figure 10, the network-side device 1000 includes: an antenna 1001, a radio frequency device 1002, a baseband device 1003, a processor 1004, and a memory 1005. Antenna 1001 is connected to radio frequency device 1002. In the uplink direction, radio frequency device 1002 receives information via antenna 1001 and sends the received information to baseband device 1003 for processing. In the downlink direction, baseband device 1003 processes the information to be transmitted and sends it to radio frequency device 1002. Radio frequency device 1002 processes the received information and sends it through antenna 1001.

[0245] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 1003 , which includes a baseband processor.

[0246] The baseband device 1003 may, for example, include at least one baseband board, on which multiple chips are arranged, as shown in Figure 10, one of which is, for example, a baseband processor, which is connected to the memory 1005 through a bus interface to call the program in the memory 1005 and execute the network device operations shown in the above method embodiment.

[0247] The network side device may further include a network interface 1006, which is, for example, a Common Public Radio Interface (CPRI).

[0248] Specifically, the network side device 1000 of the embodiment of the present application also includes: instructions or programs stored in the memory 1005 and executable on the processor 1004. The processor 1004 calls the instructions or programs in the memory 1005 to execute the method of execution of each module shown in Figure 7 and achieve the same technical effect. To avoid repetition, it will not be described here.

[0249] An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, the various processes of the embodiment of the feedback method of the above-mentioned precoding matrix indication are implemented, or the various processes of the embodiment of the method for obtaining the above-mentioned precoding matrix indication are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0250] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. In some examples, the readable storage medium may be a non-transitory readable storage medium.

[0251] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, the communication interface and the processor are coupled, and the processor is used to run a program or instruction to implement the various processes of the embodiment of the feedback method of the above-mentioned precoding matrix indication, or to implement the various processes of the embodiment of the method for obtaining the above-mentioned precoding matrix indication, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0252] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0253] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium. The computer program / program product is executed by at least one processor to implement the various processes of the embodiment of the above-mentioned method for feedback of the precoding matrix indication, or to implement the various processes of the embodiment of the method for obtaining the precoding matrix indication, and can achieve the same technical effect. To avoid repetition, it is not repeated here.

[0254] An embodiment of the present application also provides a feedback system for a precoding matrix indication, including: a terminal and a network-side device, wherein the terminal can be used to execute the steps of the precoding matrix indication feedback method described above, and the network-side device can be used to execute the steps of the precoding matrix indication acquisition method described above.

[0255] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0256] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general-purpose hardware platform, or of course, by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes a number of instructions for enabling a terminal or network-side device to execute the methods described in each embodiment of the present application.

[0257] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of this application and the scope of protection of the claims. These implementation methods are all within the protection of this application.

Claims

1. A method for providing feedback of a precoding matrix indication, comprising: The terminal obtains multiple precoding matrix indications PMI; The terminal feeds back a channel state information CSI report to a network side device based on the multiple PMIs; The CSI report is associated with the multiple PMIs, and at least some of the target PMIs in the multiple PMIs share the target non-zero coefficient indication in the CSI report.

2. The method according to claim 1, wherein: At least some of the target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report, including one of the following: The multiple PMIs share a target non-zero coefficient indication in the CSI report; The multiple PMIs are divided into at least two PMI groups, and the target PMIs in each PMI group share a target non-zero coefficient indication in the CSI report.

3. The method according to claim 1 or 2, wherein: Each bit of the target non-zero coefficient indication is associated with at least one of the target PMIs.

4. The method according to claim 3, wherein: The shared target non-zero coefficient indication satisfies one of the following: The number of target PMIs associated with each bit indicated by the target non-zero coefficient is the same; The number of target PMIs associated with each bit indicated by the target non-zero coefficient is not completely the same.

5. The method according to any one of claims 1 to 4, wherein: The target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI of a transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of a transmission layer.

6. The method according to any one of claims 1 to 4, wherein: The target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI, the target PMI is associated with multiple transmission layers, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of one transmission layer.

7. The method according to claim 5 or 6, wherein: The number of bits indicated by the second part of non-zero coefficients is determined by at least one of the following: Number of layers; The number of target PMIs; The number of bits having a value of 1 in the first part of non-zero coefficient indications; The first portion of non-zero coefficients indicates the number of indicated non-zero coefficients; The number of bits in the first part of non-zero coefficient indications associated with multiple target PMIs and having a value of 1; The number of bits in the first part of non-zero coefficient indications that are associated with one target PMI and whose value is 1.

8. The method according to any one of claims 4 to 7, wherein: The amplitude quantization value associated with the first non-zero coefficient includes zero, wherein the first non-zero coefficient is one of the following: the non-zero coefficient indicated or associated by the target non-zero coefficient indication, and the non-zero coefficient indicated or associated by the first part of the non-zero coefficient indication.

9. The method according to claim 8, wherein: The CSI report includes first indication information, where the first indication information is used to indicate the number of first non-zero coefficients whose amplitudes are quantized to zero.

10. The method according to claim 8, wherein: The CSI report includes second indication information, where the second indication information is used to indicate the number of bits whose value is 1 in the target non-zero coefficient indication.

11. The method according to any one of claims 4 to 7, wherein: The number of target PMIs associated with each bit indicated by the target non-zero coefficient is equal to the number of PMIs fed back by the terminal; or, the number of target PMIs associated with each bit indicated by the target non-zero coefficient is related to the basis vectors associated with each target PMI indicated by the terminal in the CSI report.

12. The method according to claim 11, wherein: In the case where M target PMIs out of N PMIs are associated with the same target basis vector, the number of target PMIs associated with each target bit indicated by the target non-zero coefficient is M, where the target bit is the bit associated with the target basis vector, M is less than or equal to N, and M and N are integers.

13. The method according to any one of claims 4 to 7, wherein: The number of the target PMIs associated with each bit of the target non-zero coefficient indication is related to the non-zero coefficient indication offset indicated by the terminal in the CSI report.

14. The method according to claim 13, wherein: The non-zero coefficient indicates that the offset satisfies one of the following: The CSI report is associated with a plurality of non-zero coefficient indication offsets, each of which is associated with one target PMI and a target transmission layer, and is used to indicate an offset of a non-zero coefficient indication associated with the target transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to a reference non-zero coefficient indication associated with the target transmission layer; The CSI report is associated with a plurality of non-zero coefficient indication offsets, each of which is associated with a target PMI and a plurality of transmission layers, and is used to indicate the offset of the non-zero coefficient indication of each transmission layer of the target PMI associated with the non-zero coefficient indication offset relative to the reference non-zero coefficient indication associated with the transmission layer.

15. The method according to claim 5 or 6, wherein: The feedback priority of the second part of non-zero coefficient indications is lower than the priority of the first part of non-zero coefficient indications.

16. A method for obtaining a precoding matrix indication, comprising: The network side device receives a CSI report fed back by the terminal, wherein the CSI report is associated with multiple PMIs, and at least some target PMIs among the multiple PMIs share a target non-zero coefficient indication in the CSI report; The network side device obtains the multiple PMIs based on the CSI report.

17. The method according to claim 16, wherein: At least some of the target PMIs among the multiple PMIs share the target non-zero coefficient indication in the CSI report, including one of the following: The multiple PMIs share a target non-zero coefficient indication in the CSI report; The multiple PMIs are divided into at least two PMI groups, and the PMIs in each PMI group share a target non-zero coefficient indication in the CSI report.

18. The method according to claim 16 or 17, wherein: Each bit of the target non-zero coefficient indication is associated with at least one of the target PMIs.

19. The method according to claim 18, wherein: The shared target non-zero coefficient indication satisfies one of the following: The number of target PMIs associated with each bit indicated by the target non-zero coefficient is the same; The number of target PMIs associated with each bit indicated by the target non-zero coefficient is not completely the same.

20. The method according to claim 19, wherein: The method further includes: the network side device sending a first high-layer signaling to the terminal, wherein the first high-layer signaling indicates one of the following: Each bit of the shared target non-zero coefficient indication is associated with the at least part of the target PMI; The shared portion of bits indicating the target non-zero coefficients are associated with the at least a portion of the target PMI.

21. The method according to any one of claims 16 to 20, wherein: The target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI of a transmission layer, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of a transmission layer.

22. The method according to any one of claims 16 to 20, wherein: The target non-zero coefficient indication includes: a first part of non-zero coefficient indication and a second part of non-zero coefficient indication, each bit of the first part of non-zero coefficient indication is associated with at least one target PMI, the target PMI is associated with multiple transmission layers, and each bit of the second part of non-zero coefficient indication is associated with one target PMI of one transmission layer.

23. The method according to claim 21 or 22, wherein: The method further comprises: The network side device sends a second high-layer signaling to the terminal, wherein the second high-layer signaling is used to configure whether the target non-zero coefficient indication includes a first part of non-zero coefficient indications and a second part of non-zero coefficient indications.

24. The method according to any one of claims 21 to 23, wherein: The number of bits indicated by the second part of non-zero coefficients is determined by at least one of the following: Number of layers; The number of target PMIs; The number of bits having a value of 1 in the first part of non-zero coefficient indications; The first portion of non-zero coefficients indicates the number of indicated non-zero coefficients.

25. The method according to any one of claims 16 to 24, wherein: The CSI report includes first indication information, where the first indication information is used to indicate the number of first non-zero coefficients whose amplitudes are quantized to zero.

26. The method according to claim 25, wherein: The CSI report includes second indication information, where the second indication information is used to indicate the number of bits whose value is 1 in the target non-zero coefficient indication.

27. The method according to claim 20, wherein: The number of target PMIs associated with each bit indicated by the target non-zero coefficient is equal to the number of PMIs fed back by the terminal; or, the number of target PMIs associated with each bit indicated by the target non-zero coefficient is related to the basis vectors associated with each target PMI indicated by the terminal in the CSI report.

28. The method of claim 20, wherein: The number of the target PMIs associated with each bit of the target non-zero coefficient indication is related to the non-zero coefficient indication offset indicated by the terminal in the CSI report.

29. The method according to claim 28, wherein: The method also includes: the network side device configures multiple non-zero coefficient indication offsets for the terminal, which are used to instruct the terminal to select at least one non-zero coefficient indication offset from the multiple non-zero coefficient indication offsets, and obtain the target non-zero coefficient indication based on the non-zero coefficient indication offset.

30. The method according to claim 29, wherein: The method also includes: the network side device obtains an indication of at least one non-zero coefficient indication offset associated in the CSI report fed back by the terminal, and obtains the length of the target non-zero coefficient indication fed back by the terminal through the at least one indication.

31. A feedback device for precoding matrix indication, wherein: include: A first acquisition module, used to acquire multiple PMIs; A feedback module, configured to feed back a CSI report to a network side device based on the multiple PMIs; The CSI report is associated with the multiple PMIs, and at least some of the target PMIs in the multiple PMIs share the target non-zero coefficient indication in the CSI report.

32. A device for obtaining a precoding matrix indication, wherein: include: A receiving module, configured to receive a CSI report fed back by a terminal, wherein the CSI report is associated with a plurality of PMIs, and at least some of the target PMIs in the plurality of PMIs share a target non-zero coefficient indication in the CSI report; The second acquisition module is used to acquire the multiple PMIs based on the CSI report.

33. A terminal, wherein: It comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the feedback method of the precoding matrix indication as described in any one of claims 1 to 15 are implemented.

34. A network side device, wherein: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method for obtaining the precoding matrix indication as described in any one of claims 16 to 30 are implemented.

35. A readable storage medium, wherein: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the steps of the feedback method of the precoding matrix indication as described in any one of claims 1 to 15, or implements the steps of the method for obtaining the precoding matrix indication as described in any one of claims 16 to 30.

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