CSI (Channel State Information) report feedback method, terminal and network side equipment

Abstract

Disclosed are a CSI report feedback method, a terminal and a network side device, which belong to the technical field of wireless communications, the CSI report feedback method comprising: a terminal obtaining a frequency domain rank indication format configuration; determining rank indication information associated with the CSI report to be fed back based on the frequency domain rank indication format configuration; acquiring and feeding back a CSI report based on the rank indication information; wherein the frequency domain rank indication format configuration comprises at least one of the following: the frequency domain granularity of the RI in the CSI report, and the frequency domain granularity is used for indicating that the RI in the CSI report is a sub-band RI of which the frequency domain granularity is a sub-band or indicating that the RI in the CSI report is a broadband RI of which the frequency domain granularity is a broadband; a first number of sub-bands RI associated with a CSI report band associated with the CSI report; the CSI report comprises frequency domain resources associated with each sub-band RI; the CSI reports a second number of the first sub-bands associated with each sub-band RI.

Description

Technical Field

[0001] The present application belongs to the field of wireless communication technology, and specifically relates to a CSI report feedback method, terminal and network side equipment. Background Art

[0002] In the related art, the content of the channel state information (CSI) report generally includes at least one of the precoding matrix indicator (PMI), channel quality indicator (CQI), rank indicator (RI), layer indicator (LI), CSI reference signal (CSI-RS) resource indicator (CSI-RS Resource Indicator, CRI), layer 1 reference signal received power (Layer 1 reference signal received power, L1-RSRP), and layer 1 signal-to-noise and interference ratio (Layer 1 signal-to-noise and interference ratio, L1-SINR).

[0003] However, in the related art, the granularity of RI in the CSI report is fixed to broadband, and the terminal cannot select the granularity of RI. In some cases, the fed-back CSI may deviate greatly from the actual CSI, resulting in a degradation of precoding performance. Summary of the invention

[0004] The embodiments of the present application provide a CSI report feedback method, terminal and network-side equipment, which can solve the problem that the granularity of RI in the CSI report is fixed to broadband, resulting in a large deviation between the fed-back CSI and the actual CSI, resulting in a decrease in precoding performance.

[0005] In the first aspect, a method for feedback of a CSI report is provided, comprising: a terminal obtains a frequency domain rank indication format configuration; the terminal determines the rank indication information associated with the CSI report to be fed back based on the frequency domain rank indication format configuration, wherein the rank indication information includes at least one of the following: the number of RIs and the frequency domain position associated with each RI; the terminal obtains and feeds back the CSI report based on the rank indication information; wherein the frequency domain rank indication format configuration includes at least one of the following: the frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of a subband or to indicate that the RI in the CSI report is a wideband RI with a frequency domain granularity of a wideband; a first number of subband RIs associated with the CSI report frequency band associated with the CSI report; frequency domain resources associated with each subband RI in the CSI report; a second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0006] In a second aspect, a method for obtaining a CSI report is provided, comprising: a network side device receives a CSI report fed back by a terminal based on a frequency domain rank indication format configuration, wherein the frequency domain rank indication format configuration includes at least one of the following: a frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of a subband or to indicate that the RI in the CSI report is a wideband RI with a frequency domain granularity of a wideband; a first number of subband RIs associated with the CSI report frequency band associated with the CSI report; frequency domain resources associated with each subband RI in the CSI report; a second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0007] In a third aspect, a CSI report feedback device is provided, comprising: a first acquisition module, used to acquire a frequency domain rank indication format configuration; a determination module, used to determine, based on the frequency domain rank indication format configuration, rank indication information associated with the CSI report to be fed back, wherein the rank indication information includes at least one of the following: the number of rank indication RIs, and the frequency domain position associated with each RI; a second acquisition module, used to acquire the CSI report based on the rank indication information; a feedback module, used to feed back the CSI report; wherein the frequency domain rank indication format configuration includes at least one of the following: the number of rank indication RIs, and the frequency domain position associated with each RI; The frequency domain granularity of the RI in the CSI report, the frequency domain granularity is used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of a subband or indicates that the RI in the CSI report is a broadband RI with a frequency domain granularity of a broadband; a first number of subband RIs associated with the CSI report frequency band associated with the CSI report; frequency domain resources associated with each subband RI in the CSI report; a second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0008] In a fourth aspect, a device for acquiring a CSI report is provided, comprising: a transmission module, configured to receive a CSI report fed back by a terminal based on a frequency domain rank indication format configuration; a third acquisition module, configured to acquire the CSI report; wherein the frequency domain rank indication format configuration includes at least one of the following: a frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of a subband or to indicate that the RI in the CSI report is a wideband RI with a frequency domain granularity of a wideband; a first number of subband RIs associated with the CSI report frequency band associated with the CSI report; frequency domain resources associated with each subband RI in the CSI report; a second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] In a 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.

[0014] In the tenth aspect, a CSI report feedback system is provided, including: 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.

[0015] In the eleventh aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instructions to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0016] In the twelfth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the steps of the method described in the first aspect, or to implement the steps of the method described in the second aspect.

[0017] In an embodiment of the present application, a terminal obtains a frequency domain rank indication format configuration, wherein the frequency domain rank indication format configuration includes at least one of the following: the frequency domain granularity of the RI in the CSI report, wherein the frequency domain granularity is used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of a subband or a wideband RI with a frequency domain granularity of a wideband; the first number of subband RIs associated with the CSI report frequency band associated with the CSI report; the frequency domain resources associated with each subband RI in the CSI report; the second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a precoding matrix indication PMI subband, and a channel quality indication CQI subband. The terminal determines the rank indication information associated with the CSI report to be fed back based on the frequency domain rank indication format configuration, and then obtains and feeds back the CSI report based on the rank indication information. As a result, the granularity of the RI in the CSI report fed back by the terminal is not limited to the wideband, so that the CSI can be obtained more flexibly and accurately to ensure the precoding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A block diagram showing a wireless communication system to which the embodiments of the present application can be applied;

[0019] Figure 2 A schematic diagram showing a flow chart of a CSI report feedback method provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram showing a flow chart of a method for obtaining a CSI report provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram showing a structure of a CSI report feedback device provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram showing a structure of a device for obtaining a CSI report provided in an embodiment of the present application;

[0023] Figure 6 A schematic diagram showing the structure of a communication device provided in an embodiment of the present application is shown;

[0024] Figure 7 A schematic diagram showing the hardware structure of a terminal provided in an embodiment of the present application is shown;

[0025] Figure 8 A schematic diagram of the hardware structure of a network side device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0027] The terms "first", "second", etc. of the present 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 one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0028] The term "indication" in this application can be 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, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0029] 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 described technology 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 descriptions, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0030] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine and 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 referred to as 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 (Wireless Local Area Network, WLAN) access point (Access Point, AP) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B, a 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 terms. It should be noted that in the embodiments 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.

[0031] 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 (Mobility Management Entity, MME), access mobility management function (Access and Mobility Management Function, AMF), session management function (Session Management Function, SMF), user plane function (User Plane Function, UPF), policy control function (Policy Control Function, PCF), policy and charging rules function unit (Policy and Charging Rules Function, PCRF), edge application service discovery function (Edge Application Server Discovery Function, EASDF), unified data management (Unified Data Management, UDM), unified data storage (Unified Data Repository, UDR), home user server (Home Subscriber Server, HSS), centralized network configuration (CNC), network storage function (Network Repository Function, NRF), network exposure function (Network Exposure Function, NEF), local NEF (Local NEF, or L-NEF), binding support function (Binding Support Function, BSF), application function (Application Function, AF), etc. 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.

[0032] In order to better understand the technical solution provided by this application, the relevant technologies involved in this application are first introduced.

[0033] 1. CSI Architecture

[0034] Generally, the CSI architecture can be divided into two parts: downlink CSI and uplink CSI. Downlink CSI architecture: includes downlink physical channels and downlink reference signals; uplink CSI architecture: includes uplink physical channels and uplink reference signals.

[0035] 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).

[0036] In 5G systems, CSI is mainly used in adaptive beamforming and multiple input multiple output (MIMO) technologies to improve wireless transmission bandwidth and reliability.

[0037] In general, the 5G CSI architecture is a very important technology in the 5G communication system, and plays an important role in improving wireless transmission bandwidth and reliability and interference coordination.

[0038] 2. Contents of CSI Report

[0039] Typically, the terminal can determine through high-layer signaling or default rules that the CSI report may include: 'none', 'cri-ri-pmi-cqi', 'cri-RI-i1', 'cri-RI-CQI', 'cri-RSRP', 'cri-SINR', 'tdcp', 'ssb-Index-RSRP', 'ssb-Index-SINR' or 'cri-RI-LI-PMI-CQI'.

[0040] If the terminal is configured with CSI-ReportConfig and the upper layer parameter reportQuantity is set to "none", the terminal will not report anything for CSI-ReportConfig.

[0041] If the reportQuantity field in the high-level parameter CSI-ReportConfig is set to 'cri-RI-CQI', the terminal assumes that PMI is a unit matrix and only needs to report CRI / RI / CQI but not PMI.

[0042] If PMI exists, the PMI indication can usually be divided into two large feedback amounts i1 and i2. As the number of subbands increases, the feedback amount may exceed 1000 bits at most. In addition, for the PMI of CJT, when the high-level signaling codebookMode is configured as mode1, the feedback amount i1 additionally includes the feedback amount i1,9 for indicating the frequency domain basis vector offset between multiple TRPs of CJT. In addition, for the PMI reported by the traditional Type2 series CSI, it is usually obtained through the PMI feedback amount shown in Table 1. Each row of the table can be understood as a PMI feedback amount.

[0043] Table 1.

[0044]

[0045]

[0046] For the Type 2 series CSI reports carried on the Physical Uplink Shared Channel (PUSCH), they are usually divided into two parts, CSI report part 1 and CSI report part 2. Each part is independently encoded, and the size of CSI report part 2 can be determined by CSI report part 1.

[0047] In the related art, a CSI report setting (also referred to as a CSI report configuration) is associated with a CSI report. There is at least one RI in the CSI report. For the RI in the CSI report, the granularity is broadband, that is, all CSI report subbands associated with the CSI report are associated with the same rank value.

[0048] It can be seen that in the related technology, whether it is codebook or non-codebook CSI feedback, the rank selection is broadband granularity, which cannot reflect the different ranks of different subbands. Therefore, in some cases, such as large-bandwidth CSI measurement, it may cause system performance degradation or CSI inaccuracy.

[0049] In response to the above problems, an embodiment of the present application provides a CSI report feedback method, terminal and network side device.

[0050] The following, in conjunction with the accompanying drawings, describes in detail the feedback scheme of the CSI report provided in the embodiment of the present application through some embodiments and their application scenarios.

[0051] Figure 2 A flow chart of a method for transmitting a CSI report feedback in an embodiment of the present application is shown. The method 200 can be executed by a terminal. In other words, the method can be executed by software or hardware installed on the terminal. Figure 2As shown, the method may include the following steps.

[0052] S210, the terminal obtains a frequency domain rank indication format configuration.

[0053] In an embodiment of the present application, the frequency domain rank indication format configuration includes at least one of the following:

[0054] (1) The frequency domain granularity of the RI in the CSI report, the frequency domain granularity is used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of subband or to indicate that the RI in the CSI report is a wideband RI with a frequency domain granularity of wideband; that is, the frequency domain rank indication format configuration can configure the frequency domain granularity of the RI in the CSI report to be subband or wideband.

[0055] In the embodiment of the present application, the subband RI (i.e., subband rank indication) generally indicates that a rank indication is associated with at least one subband, and the subband generally indicates a continuous resource element (RE) or resource block (RB) in the frequency domain. In particular, when the frequency range represented by the continuous RE or RB is greater than or equal to the CSI reporting band (CSI reporting band) associated with the CSI report, the subband rank indication is equivalent to the wideband rank indication.

[0056] (2) The first number of sub-band RIs associated with the CSI reporting band (CSI reporting band) associated with the CSI report; wherein the CSI reporting band associated with the CSI report may be a frequency band or bandwidth associated with the CSI report, for example: the bandwidth associated with the CSI report as agreed upon by the protocol or configured by the network is the bandwidth of the BWP (Bandwidth Part) associated with the CSI report, and another example: the bandwidth associated with the CSI report as agreed upon by the protocol or configured by the network is the bandwidth of a carrier. The CSI reporting band may also be a partial frequency band or partial bandwidth in the frequency band or bandwidth associated with the CSI report, and the terminal obtains the partial frequency band or partial bandwidth through network high-layer signaling. The bandwidth generally refers to a bandwidth of a section of the frequency domain, and the frequency band generally represents a section of the frequency band or a block of the frequency band.

[0057] In practical applications, the frequency domain rank indication format configuration may directly indicate the first number of subband RIs associated with the CSI reporting band associated with the CSI report, or the frequency domain rank indication format configuration may be indirectly indicated, for example, the terminal receives high-layer signaling related to the CSI reporting configuration sent by the network side, and based on the high-layer signaling, the terminal determines the number of rank value restrictions associated with the CSI report (also referred to as the number of RI restrictions), and determines the first number of subband RIs associated with the CSI reporting band associated with the CSI report according to the rank value restrictions. For example: the first number is equal to the number of rank value restrictions.

[0058] (3) Frequency domain resources associated with each subband RI in the CSI report; the frequency domain rank indication format configuration may configure the frequency domain resources associated with each subband RI in the CSI report, so that the terminal can determine the subband or subband index (subband index) or subband position associated with each subband RI. The frequency domain resources may be at least one of the following: the number of RBs, the RB position, the number of REs, the RE position, the number of RB groups, and the RB group position, wherein the RB group represents a group of RBs, which may generally be a group of RBs agreed upon by the protocol. For example, the frequency domain rank indication format configuration may configure which RBs or how many RBs are associated with each subband RI, or may configure the frequency domain starting position of the first subband, and the number of RBs associated with each subband.

[0059] (4) The second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: CSI reporting subband, PMI subband, CQI subband. The one CSI reporting subband or PMI subband or CQI subband usually represents a plurality of RBs configured by the network side device or agreed upon by the protocol, for example: the protocol stipulates that a CSI reporting subband includes 4 RBs, or the network side device indicates through high-layer signaling that a CSI reporting subband includes 8 RBs. For example, the protocol stipulates or the network side device configures one PMI subband to associate with 2 CSI reporting subbands or 2 PMI subbands to associate with one CSI reporting subband. For example, the protocol stipulates or the network side device configures one CQI subband to associate with one CSI reporting subband.

[0060] In one implementation, the terminal may obtain the frequency domain rank indication format configuration based on the first network high-layer signaling. In this implementation, the terminal may obtain the frequency domain rank indication format configuration indicated by the first network high-layer signaling, and determine the number of RIs in the CSI report or the frequency domain position associated with each RI based on the frequency domain rank indication format configuration.

[0061] In the above implementation, when the terminal does not obtain the first network high-layer signaling related to the frequency domain rank indication format configuration, the terminal determines that the frequency domain granularity of the RI associated with the CSI report is broadband.

[0062] For example, the terminal can obtain at least one of the following information through the first network high-layer signaling:

[0063] 1. The frequency domain granularity of the RI in the CSI report. For example, the network side device may indicate through the first network high layer signaling that the granularity of the rank indication is broadband or subband;

[0064] 2. The number of subband RIs associated with the CSI reporting band. For example, the network-side device may indicate the number of subband RIs (RI-subbands) associated with the CSI report through the first network high-layer signaling. Specifically, when the number of subband RIs is 1, it means that the CSI report includes one RI associated with the entire CSI reporting band.

[0065] 3. Frequency domain resources associated with each subband RI associated with the CSI report. For example, the network side device may indicate multiple subband RIs and frequency domain resources associated with each subband RI through high-level signaling, for example, which RBs (or how many RBs) are associated with each subband RI. Optionally, when the high-level signaling does not exist, the terminal assumes that the CSI report includes one RI associated with the entire CSI report frequency band.

[0066] 4. The number of first subbands associated with each subband RI associated with the CSI report, where the first subband may be a CSI reporting subband (CSI reporting subband), or a PMI subband (PMI subband), or a CQI subband (CQIsubband). For example, the network side device configures a subband RI associated with K1 CSI reporting subbands through the first network high-layer signaling, and the one CSI reporting subband is the minimum frequency domain granularity associated with the CSI feedback amount, where K1 is an integer greater than or equal to 1. For another example, the network side device configures a subband RI associated with K2 PMI subbands through the first network high-layer signaling, and the one PMI subband is the minimum frequency domain granularity associated with the PMI in the CSI report, where K2 is an integer greater than or equal to 1. For another example, the network side device configures a subband RI associated with K3 CQI subbands through high-layer signaling, and the one CQI subband is the minimum frequency domain granularity associated with the CQI in the CSI report, where K3 is an integer greater than or equal to 1.

[0067] In the case where the first network high-layer signaling related to the frequency domain rank indication format configuration does not exist in the network high-layer signaling, the terminal assumes that the RI associated with the CSI report is associated with the entire CSI report frequency band, that is, the terminal determines that the frequency domain granularity of the RI associated with the CSI report is wideband. That is, the terminal obtains the RI based on the entire CSI report frequency band.

[0068] In another implementation, the terminal may determine, based on the second network high-layer signaling, that the frequency domain rank indication format configuration is determined by the terminal, and then the terminal acquires the frequency domain rank indication format configuration according to the measured channel.

[0069] Optionally, the configuration in the above frequency domain rank indication format configuration may satisfy at least one of the following:

[0070] (1) The number of first subbands associated with each subband RI (for example, the second number mentioned above) is related to the bandwidth associated with the CSI report; optionally, the number of first subbands associated with the subband RI (or the number of RBs, or the size of frequency domain resources) increases with the increase of bandwidth.

[0071] (2) when the bandwidth associated with the CSI report exceeds a predetermined threshold, the RI in the CSI report is a subband RI;

[0072] In this optional implementation, when the bandwidth associated with the CSI report exceeds a certain threshold, the CSI report includes the subband RI, and the threshold is not limited to network configuration, protocol agreement, terminal feedback, etc. Through this optional implementation, when the bandwidth associated with the CSI report exceeds a certain threshold, the granularity of the RI can be set to the subband, thereby ensuring the accuracy of CSI acquisition.

[0073] Optionally, the number of subband RIs in the CSI report (which may be the same as the first number or different from the first number) increases as the bandwidth associated with the CSI report increases.

[0074] In yet another optional implementation, the terminal may obtain the frequency domain rank indication format configuration through at least one of the following:

[0075] (1) The terminal determines the size of the frequency domain resources associated with each of the sub-band RIs according to a third network high-layer signaling or a protocol agreement, and then determines the first number of the sub-band RIs associated with the CSI reporting band based on the size of the CSI reporting band and the size of the frequency domain resources associated with each of the sub-band RIs. The third network high-layer signaling and the first network high-layer signaling or the second network high-layer signaling may be the same network high-layer signaling or different network high-layer signaling.

[0076] (2) The terminal determines, according to a fourth network high-layer signaling or protocol agreement, a first number of the sub-band RIs associated with the CSI reporting frequency band, and then determines, according to a size of the CSI reporting frequency band and the first number, a size of the frequency domain resources associated with each of the sub-band RIs. The third network high-layer signaling and the first network high-layer signaling or the second network high-layer signaling may be the same network high-layer signaling or different network high-layer signaling.

[0077] Optionally, the size of the frequency domain resources associated with each of the subband RIs is related to the size of the frequency domain resources associated with the PMI subband or the CQI subband, that is, the size of the frequency domain resources associated with each of the subband RIs can be determined by the size of the frequency domain resources associated with the PMI subband or the CQI subband. For example, the size of the frequency domain resources of each subband RI is an integer multiple of the size of the frequency domain resources associated with the CQI subband or the PMI subband.

[0078] S212: The terminal determines rank indication information associated with the CSI report to be fed back based on the frequency domain rank indication format configuration.

[0079] The rank indication information includes at least one of the following: the number of RIs and the frequency domain position associated with each RI.

[0080] After obtaining the frequency domain rank indication format configuration, the terminal can determine the rank indication information associated with the CSI report to be fed back based on the frequency domain rank indication format configuration, for example, the number of RIs or the frequency domain positions associated with each RI, where the frequency domain positions associated with the RIs generally indicate the position of a certain RI-associated frequency domain position in the frequency domain position associated with the CSI report.

[0081] In an optional implementation, when the frequency domain rank indication format configuration includes the first number or the second number, in S212, the terminal may divide the multiple first subbands associated with the CSI report based on the first number or the second number, and determine the first subband or the first subband position or the first subband index associated with each subband RI.

[0082] Optionally, the division process may not be divisible evenly, so the division result may result in the number of first subbands associated with each subband RI being different. Alternatively, the number of first subbands associated with the first subband RI is different from the number of first subbands associated with other subband RIs. Alternatively, the number of first subbands associated with the last subband RI is different from the number of first subbands associated with other subband RIs. Alternatively, the number of first subbands associated with the first subband RI and the last subband RI is different from the number of first subbands associated with other subband RIs.

[0083] For example, when the frequency domain rank indication format configuration includes the second number of first subbands associated with each subband RI (for example, when the terminal obtains the second number of first subbands associated with each subband RI according to high-level signaling), the terminal divides all first subbands associated with the CSI report based on the second number, and there is a case where the number of first subbands associated with each subband RI is not exactly the same. Or, there is a case where the number of first subbands associated with the first subband RI is different from the number of first subbands associated with other subband RIs. Or, there is a case where the number of first subbands associated with the last subband RI is different from the number of first subbands associated with other subband RIs. Or, there is a case where the number of first subbands associated with the first subband RI and the last subband RI is different from the number of first subbands associated with other subband RIs. It can also be understood that the division method agreed upon by the protocol or determined by the terminal may make the number of first subbands associated with some subband RIs less than the number of first subbands associated with other subband RIs.

[0084] Alternatively, when the frequency domain rank indication format configuration includes the first number of subband RIs associated with the CSI reporting band (for example, when the terminal obtains the first number of subband RIs associated with the CSI reporting band (CSI reporting band) according to high-layer signaling), the terminal divides all CSI reporting subbands associated with the CSI report based on the first number, and there is a case where the number of CSI reporting subbands associated with each subband RI is not exactly the same. Alternatively, there is a case where the number of CSI reporting subbands associated with the first subband RI is different from the number of CSI reporting subbands associated with other subband RIs. Alternatively, there is a case where the number of CSI reporting subbands associated with the last subband RI is different from the number of CSI reporting subbands associated with other subband RIs. Alternatively, there is a case where the number of CSI reporting subbands associated with the first subband RI and the last subband RI is different from the number of CSI reporting subbands associated with other subband RIs.

[0085] In an optional implementation manner of the embodiment of the present application, when the terminal determines multiple subband RIs associated with the CSI report to be fed back based on the frequency domain rank indication format configuration, the method may further include at least one of the following:

[0086] (1) The terminal indicates the determined multiple sub-band RIs to the network side device through a reference RI and multiple sub-band differential RIs, wherein the one sub-band differential RI indicates a difference value of the rank value between the one sub-band RI and the reference RI.

[0087] Optionally, the terminal determines to indicate the multiple subband RIs to the network side device through one reference RI and multiple subband differential RIs. Optionally, when the multiple subband RIs include one reference RI and multiple subband differential RIs, the terminal may map the one reference RI to Part 1 of the CSI report and the multiple subband differential RIs to Part 2 of the CSI report; or, the one reference RI and the multiple subband differential RIs are mapped to Part 1 of the CSI report.

[0088] (2) the terminal maps the multiple subband RIs into the first part of the CSI report;

[0089] (3) the terminal divides all the first subbands associated with the CSI report into multiple subband groups, and each subband group is associated with one subband RI;

[0090] Optionally, the terminal may indicate the division result to the network side device in the CSI report, and the division result includes but is not limited to: the number of subband groups or the division method or the frequency domain position of the subband group or the starting frequency domain position of the subband group; or, the network side device may also configure at least one division method through high-level signaling, and the terminal selects a division method to feedback the corresponding RI. Optionally, the division method may be non-uniform division or uniform division.

[0091] Optionally, all first subbands included in the first subband group may be continuous or non-continuous in the frequency domain.

[0092] (4) The terminal divides the CSI reporting frequency band into multiple second sub-bands, and each of the second sub-bands is associated with one of the sub-band RIs.

[0093] Optionally, the terminal may indicate the division result to the network in the CSI report, and the division result includes but is not limited to at least one of the following: the number of second subbands, the size of the second subbands, the division method, the position of the second subbands, and the starting position of the second subbands; or, the network side device configures at least one division method through high-level signaling, and the terminal selects a division method to feedback the corresponding RI.

[0094] Optionally, the multiple subbands may be continuous or non-continuous in the frequency domain, that is, there may be some frequency domain resources on the frequency domain resources associated with the CSI report that are not associated with any subband.

[0095] (5) The terminal determines the number of rank value restrictions (also referred to as RI restriction indication) associated with the CSI report. When the number of rank value restrictions associated with the CSI report is 1, the multiple subband RIs are associated with the same rank value restriction. When the number of rank value restrictions associated with the CSI report is multiple, the multiple subband RIs are associated with different rank value restrictions.

[0096] (6) The terminal determines a plurality of CSI reference signal resource indicators (CSI-RS Resource Indicator, CRI) associated with the CSI report, each of the CRIs being associated with one of the subband RIs.

[0097] (7) The terminal determines the number of target objects associated with the CSI report, where the number of target objects is related to the number of the multiple sub-band RIs, wherein the target object includes at least one of the following: a CSI processing unit (Active source), an activated resource (active resource), and an activated resource port (active resource port); that is, the terminal can determine the number of target objects based on the number of the multiple sub-band RIs.

[0098] (8) The terminal determines that the granularity of the CQI associated with the CSI report is a subband; for example, the network side device may configure the granularity of the CQI to be a subband. Alternatively, the terminal may assume that the granularity of the CQI is a subband. In this case, the network side device may not configure the granularity of the CQI, or the network side device may configure the granularity of the CQI, but the terminal does not refer to it and still determines that the granularity of the CQI associated with the CSI report is a subband.

[0099] (9) The terminal determines that the granularity of the PMI associated with the CSI report is a subband. For example, the network side device may configure the granularity of the PMI as a subband. Alternatively, the terminal may assume that the granularity of the PMI is a subband. In this case, the network side device may not configure the granularity of the PMI, or the network side device may configure the granularity of the PMI, but the terminal does not refer to it and still determines that the granularity of the PMI associated with the CSI report is a subband.

[0100] For example, when the terminal determines that the CSI report includes multiple subband RIs according to the frequency domain rank indication format configuration indicated by the network high-level signaling or other signaling, wherein the other signaling may be a signaling for configuring whether the CSI report feeds back multiple subband RIs, or a signaling for activating / deactivating whether the CSI report feeds back multiple subband RIs, or a medium access control layer control element (MAC CE), or downlink control information (DCI). Optionally, the terminal may also determine that the multiple subband RIs are indicated to the network through a reference RI and multiple subband differential RIs.

[0101] Optionally, when the multiple subband RIs include one reference RI and multiple subband differential RIs, the terminal maps the one reference RI to Part 1 of the CSI report and the multiple subband differential RIs to Part 2 of the CSI report; or maps the one reference RI and the multiple subband differential RIs to Part 1 of the CSI report.

[0102] Optionally, the terminal may determine to map the multiple RIs to Part 1 of the CSI report.

[0103] Optionally, the terminal may also determine whether to allow the terminal to recommend or select the correspondence between each RI and the first subband. For example, the terminal may determine whether to allow the terminal to recommend or select the correspondence between each RI and the first subband according to network high-layer signaling.

[0104] Optionally, the terminal may also determine to divide all first subbands associated with the CSI report into multiple first subband groups, and each first subband group is associated with an RI. That is, each RI in the multiple RIs is associated with at least one first subband, and the number of first subbands associated with different RIs may be different, and the first subbands associated with different RIs are different; further, the terminal may divide all first subbands and indicate the division result to the network side device in the CSI report; or, the network side device configures at least one division method through high-level signaling, and the terminal selects a division method to feedback the corresponding RI. For example, if the network side device is configured with multiple division methods, the terminal indicates the selected division method to the network through the CSI report. If the network is configured with one division method, the terminal may not indicate the selected division method to the network through the CSI report, that is, there is no corresponding field in the CSI report to indicate the selected division method. The terminal selecting a division method can be understood as the network pre-configuring at least one division method for all first subbands, and the terminal selects a division method from them.

[0105] Optionally, the terminal may also determine the number of RI restriction indications present in the codebook configuration signaling associated with the CSI report. When there is one RI restriction indication, all subband RIs are associated with the same RI restriction indication; when there are multiple RI restriction indications, each RI restriction indication is associated with the one subband RI.

[0106] Optionally, the terminal may also determine that the CSI report is associated with multiple CRIs, and each CRI is associated with a subband RI.

[0107] Optionally, the terminal may further determine the number of CPUs associated with the CSI report, where the number of CPUs is related to the number of subband RIs. For example, when the CSI report is associated with 3 RIs, the number of CPUs occupied by the CSI report is an integer multiple of 3, or 3 plus an integer.

[0108] Optionally, the terminal further determines the number of Active resources or active resourceports associated with the CSI report, where the number is related to the number of subband RIs;

[0109] The above determination may be determined through high-level signaling, MAC CE, DCI, or through protocol agreement, or through other implicit indication methods.

[0110] S214: The terminal obtains and feeds back the CSI report based on the rank indication information.

[0111] In one implementation, in S214, the terminal obtains the RI associated with the CSI report based on the rank indication information.

[0112] In an embodiment of the present application, the terminal obtains a frequency domain rank indication format configuration, and determines at least one of the number of RIs in the CSI report, the frequency domain position associated with each RI, the frequency domain starting position associated with the first RI, and the frequency bandwidth of each RI based on the frequency domain rank indication format configuration. Then, based on the number of RIs in the CSI report or the frequency domain position of each RI association, the RI can be obtained. Based on the obtained RI, the terminal can determine a mapping method for mapping the PMI or the PMI feedback amount to the CSI report, as well as a mapping method for mapping the CQI to the CSI report, thereby feeding back the CSI report.

[0113] In one implementation, when the RI associated with the CSI report is a plurality of subband RIs, the terminal obtains the CSI report based on the rank indication information, further comprising at least one of the following:

[0114] (1) In the case where multiple subband RIs are associated with the same rank value, the terminal determines that all CQIs associated with the CSI report are associated with a first bandwidth, where the first bandwidth is the bandwidth associated with the CSI report or the CSI report frequency band associated with the CSI report; that is, when the multiple RIs are associated with the same rank value, the CQI associated with the CSI report is associated with the entire bandwidth associated with the CSI report or the entire CSI report frequency band, that is, the CSI report contains a wideband CQI associated with the entire bandwidth associated with the CSI report and / or multiple subband differential CQIs associated with the entire bandwidth associated with the CSI report. One CQI among all the CQIs can be understood as a wideband CQI or multiple subband differential CQIs associated with the wideband CQI.

[0115] For example, in the CSI report, there is one wideband CQI associated with the entire bandwidth associated with the CSI report, or multiple subband differential CQIs associated with the wideband CQI are associated with the entire bandwidth associated with the CSI report.

[0116] (2) In the case where multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that at least some of the multiple CQIs associated with the CSI report are associated with bandwidths or frequency domain resources that are not completely the same; one CQI among the multiple CQIs can be understood as a wideband CQI or multiple subbanddifferential CQIs associated with the wideband CQI. The frequency domain resources can be at least one of the following: the number of RBs, the position of RBs, the number of REs, the position of REs, the number of RB groups, the position of RB groups, the number of CSI report subbands, and the position of CSI report subbands.

[0117] Optionally, multiple CQIs are wideband CQIs, each of the wideband CQIs is associated with at least one transmission layer, and for each of the wideband CQIs, the CSI report includes multiple first subband differential CQIs, and the multiple first subband differential CQIs are associated with a second bandwidth, and the second bandwidth is the bandwidth or frequency domain resource associated with the wideband CQI. For example, there are multiple wideband CQIs in the CSI report, and each wideband CQI is associated with at least one transmission layer; all wideband CQIs may be associated with bandwidths or frequency domain resources that are not exactly the same. Optionally, for each wideband CQI, the CSI report may include multiple subband differential CQIs associated with the bandwidth or frequency domain resources associated with the wideband CQI. When the multiple RIs are associated with rank values ​​that are not exactly the same, the CSI report is associated with multiple wideband CQIs, and each wideband CQI is associated with at least one transmission layer. Further, all wideband CQIs may be associated with bandwidths or frequency domain resources that are not exactly the same. It can be understood that since the bandwidth associated with at least one transmission layer is different from that of other transmission layers, the bandwidth associated with at least one CQI is not completely the same as the bandwidth or frequency domain resources associated with other CQIs.

[0118] In this implementation, for each wideband CQI, the CSI report may include multiple subbanddifferential CQIs associated with the bandwidth or frequency domain resources associated with the wideband CQI. For example: 3 subband RIs (RI0 / 1 / 2) are respectively associated with subband 0 / 1 / 2, and RI0=2, RI1=1, RI2=2. At this time, the CSI report is associated with 2 wideband CQIs, where the first wideband CQI is associated with subband 0 / 1 / 2 associated with layer 0; the second wideband CQI is associated with subband 0 / 2 associated with layer1. In addition, the CSI report also includes 3 CQI differences associated with the first widebandCQI, which are respectively associated with subband 0 / 1 / 2, and 2 CQI differences associated with the second wideband CQI, which are respectively associated with subband 0 / 2;

[0119] Optionally, a plurality of the CQIs share a wideband CQI in the CSI report, and the CSI report further includes a plurality of second subband differential CQIs, each of which is associated with a transmission layer and a subband RI. For example, the wideband CQI (one in the case of a single codeword and multiple in the case of multiple codewords) in the CSI report is associated with all subband RIs; further, the CSI report further includes a plurality of subband differential CQIs, each subband differential CQI is associated with a transmission layer and a subband RI, and there are a plurality of subband differential CQIs associated with different transmission layers and different subband RIs. Alternatively, each subband differential CQI is associated with a subband RI, and there are a plurality of subband differential CQIs associated with different subband RIs.

[0120] In this implementation, when the multiple RIs are associated with rank values ​​that are not exactly the same, one wideband CQI is associated in the CSI report, and the wideband CQI is associated with all subband RIs or all transmission layers or the bandwidth associated with the entire CSI report or the CSI report frequency band associated with the CSI report. Furthermore, the CSI report also includes multiple subbanddifferential CQIs, each subband differential CQI is associated with one transmission layer and one subband RI, and there are multiple subband differential CQIs associated with different transmission layers and different subband RIs. For example: 3 subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2, respectively, and RI0=2, RI1=1, RI2=2. At this time, one wideband CQI is associated in the CSI report, and the wideband CQI is associated with layer 0 / 1 of subband 0, layer 0 of subband 1, and layer 0 / 1 of subband2. In addition, the CSI report also includes 2 CQI differences associated with the first wideband CQI associated with subband 0 associated with RI0, where each CQI difference is associated with a transmission layer, and 1 CQI difference associated with subband 1 associated with RI1, and 2 CQI differences associated with subband 2 associated with RI2, where each CQI difference is associated with a transmission layer.

[0121] (3) When the multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that the CSI report is associated with multiple CQIs, each of which is associated with one subband RI;

[0122] For example, there are multiple wideband CQIs in the CSI report, and each wideband CQI is associated with a subband RI; further, for each wideband CQI, the CSI report may include multiple subband differential CQIs associated with the bandwidth or frequency domain resources associated with the wideband CQI or subband RI.

[0123] In this implementation, when the multiple RIs are associated with rank values ​​that are not exactly the same, the CSI report is associated with multiple wideband CQIs, and each wideband CQI is associated with a subband RI. Further, for each wideband CQI, the CSI report may include multiple subband differential CQIs associated with the bandwidth or frequency domain resources associated with the wideband CQI or subband RI.

[0124] (4) when the CSI report is associated with a plurality of codewords (Codeword, CW), the terminal determines that different numbers of codewords are associated with different subband RIs;

[0125] For example, a subband RI with a subband RI value greater than 4 is associated with 2 CWs, and a subband RI with a subband RI value less than or equal to 4 is associated with 1 CW. Further, the terminal maps all CQIs associated with the subband RI respectively, and all CQIs associated with the first codeword are first mapped to the UCI, and all CQIs are associated with the entire CSI report frequency band. All CQIs associated with the second CW are then mapped to the UCI, and all CQIs associated with the RI subband with a subband RI value greater than 4. It can be understood that when UCI is mapped, the mapping priority of the first CW is higher than that of the second CW.

[0126] Optionally, the number of codewords associated with the CSI report may be determined in at least one of the following ways:

[0127] (a) Determined according to the mean of the rank values ​​associated with all the subband RIs; Optionally, for transmission layers exceeding the capacity of the CW, the terminal does not feed back the CSI associated with the corresponding transmission layer. For example, according to the mean, it is determined to be 1 CW, and the CW can only accommodate 4 transmission layers, but there is a subband associated with 5 transmission layers. In this case, for the fifth transmission layer, the terminal does not feed back its associated precoding vector and CQI.

[0128] (b) Determined according to the weighted mean of the rank values ​​associated with all the subband RIs, wherein the weight factor of each rank value associated with the subband RI is related to the bandwidth associated with the subband RI; Optionally, for transmission layers exceeding the capacity of the CW, the terminal does not feed back the CSI associated with the corresponding transmission layer, for example: determined as 1 CW according to the weighted mean, the CW can only accommodate 4 transmission layers, but there is a subband associated with 5 transmission layers, then for the fifth transmission layer, the terminal does not feed back its associated precoding vector and CQI.

[0129] (c) Determined according to the rank value associated with the wideband RI. That is, in addition to the subband RI, the terminal needs to obtain the wideband RI to determine the number of CWs. If the number of CWs is 1, the rank values ​​of all subband RIs are less than or equal to a specific value (such as 4). If the number of CWs is greater than 1, there is a subband RI with a rank value greater than the specific value.

[0130] (5) in the case where the multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that there is at least one PMI feedback amount in the CSI report associated with multiple first PMI feedback amounts, each of the first PMI feedback amounts is associated with a transmission layer, and some of the multiple first PMI feedback amounts are associated with the entire bandwidth or the entire CSI report frequency band associated with the CSI report, and some of the multiple first PMI feedback amounts are associated with a partial bandwidth or a partial frequency band of the CSI report frequency band associated with the CSI report;

[0131] In this implementation, when the multiple RIs are associated with rank values ​​that are not exactly the same, there is at least one PMI feedback amount in the CSI report that is associated with multiple first PMI feedback amounts, and each first PMI feedback amount is associated with a transmission layer. The multiple first PMI feedback amounts indicate that there is a PMI feedback amount that is related to the number or sequence number of transmission layers, that is, the overhead of the PMI feedback amount is related to the number of transmission layers. It can also be understood that the multiple first PMI feedback amounts are feedback amounts of the same nature and are multiple PMI feedback amounts due to the existence of multiple transmission layers. Further, there are some PMI feedback amounts in the multiple first PMI feedback amounts that are associated with the bandwidth associated with the entire CSI report or the entire CSI report frequency band, and there are some first PMI feedback amounts that are associated with part of the bandwidth associated with the entire CSI report or part of the frequency band of the entire CSI report frequency band. For example: 3 subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2 respectively, and RI0=2, RI1=1, RI2=2. At this time, the CSI report contains one first PMI feedback amount (eg, frequency domain basis vector indication) associated with layer0 and associated with subband 0 / 1 / 2, and one first PMI feedback amount (eg, frequency domain basis vector indication) associated with layer1 and associated with subband 0 / 2.

[0132] (6) when the multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that at least one PMI feedback amount in the CSI report is associated with multiple second PMI feedback amounts, and each of the second PMI feedback amounts is associated with one subband RI;

[0133] In this implementation, when the multiple RIs are associated with rank values ​​that are not exactly the same, there is at least one PMI feedback amount in the CSI report that is associated with multiple second PMI feedback amounts, and each second PMI feedback amount is associated with a subband RI. The multiple second PMI feedback amounts indicate that there is a PMI feedback amount that is related to the number or sequence number of subband RIs, that is, there is a PMI feedback amount whose overhead is related to the number of subband RIs. It can also be understood that the multiple second PMI feedback amounts are feedback amounts of the same nature, and they are multiple PMI feedback amounts because there are multiple subband RIs. Furthermore, each of the multiple second PMI feedback amounts is associated with all transmission layers of the associated subband RI, or each second PMI feedback amount is associated with one transmission layer of the associated subband RI. For example: 3 subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2 respectively, and RI0=2, RI1=1, RI2=2. At this time, the CSI report contains one second PMI feedback amount associated with RI0 (e.g., frequency domain basis vector indication) associated with layer0 and layer1 associated with subband 0, one second PMI feedback amount associated with RI1 (e.g., frequency domain basis vector indication) associated with layer0 associated with subband 1, and one second PMI feedback amount associated with RI2 (e.g., frequency domain basis vector indication) associated with layer0 and layer1 associated with subband2.

[0134] (7) when a plurality of the sub-band RIs are associated with the same rank value, the terminal determines that at least one PMI feedback amount in the CSI report is associated with a third PMI feedback amount, and the third PMI feedback amount is associated with all transmission layers and all the sub-band RIs;

[0135] In this implementation, when the multiple RIs are associated with exactly the same rank value, there is at least one PMI feedback amount in the CSI report that is associated with a third PMI feedback amount, and the third PMI feedback amount is associated with all transmission layers and all subband RIs. The third PMI feedback amount indicates that any PMI feedback amount is independent of the number or sequence number of subband RIs, and it can also be understood that the third PMI feedback amount is a feedback amount of the same nature and the overhead of the PMI feedback amount does not change due to the existence of multiple subband RIs. For example, three subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2, respectively, and RI0=1, RI1=1, and RI2=1. At this time, there is a third PMI feedback amount (such as a frequency domain basis vector indication) associated with RI0 / 1 / 2 and layer0 in the CSI report that is associated with subband 0 / 1 / 2. In addition, when the condition that the multiple RIs are associated with exactly the same rank value is not met, the situation of the PMI feedback amount can be determined based on other methods.

[0136] (8) When the same rank value is associated with a plurality of subband RIs, the terminal determines that a layer indicator (LI) is associated with the CSI report;

[0137] In this implementation, when the multiple subband RIs are associated with the same rank value, one LI indication is associated in the CSI report; when the multiple subband RIs are associated with rank values ​​that are not completely the same, multiple LI indications are associated in the CSI report, and each LI indication is associated with one subband RI. Alternatively, when the multiple subband RIs are associated with rank values ​​that are not completely the same, and there is at least one subband RI associated with multiple CWs, multiple LI indications are associated in the CSI report, there are at least 2 LI indications associated with the same subband RI, or there is at least 1 subband RI associated with multiple LI indications.

[0138] (9) In the case where the multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that the CSI report is associated with multiple layer indications, and each layer indication is associated with one subband RI.

[0139] Through the above implementation, the mapping method of the CSI report can be flexibly determined based on whether the subband RI is exactly the same, avoiding extra overhead waste. In the above implementation, a variety of candidate CSI mapping methods are given. In actual deployment, a certain method can also be used as a separate CSI mapping method, regardless of whether the subband RI is exactly the same.

[0140] The above-mentioned PMI feedback amount can be understood as a component of the terminal feedback precoding matrix used for the network to obtain, that is, the network needs to use multiple PMI feedback amounts to obtain the terminal feedback precoding matrix, for example, the spatial basis vector indicates the associated feedback amount (i_1_1, i_1_2), the frequency domain basis vector indicates the associated feedback amount (i_1_5, i_1_6_l), the combination coefficient amplitude indicates the associated feedback amount, the combination coefficient phase indicates the associated feedback amount, the strongest coefficient indicates the associated feedback amount, the non-zero coefficient indicates the feedback amount, the number of non-zero coefficients indicates the feedback amount, the precoding matrix index indicates the feedback amount, etc.

[0141] In one implementation, when the terminal determines that there is at least one PMI feedback amount associated with multiple first PMI feedback amounts in the CSI report, and each of the first PMI feedback amounts is associated with a transmission layer, the method may further include at least one of the following:

[0142] (1) The terminal determines the number of first subbands associated with each transmission layer based on the multiple subband RIs; wherein the number of first subbands associated with different transmission layers may be different.

[0143] (2) The terminal determines the dimension of the frequency domain compression matrix based on the number of first subbands associated with each transmission layer; when the number of first subbands associated with different transmission layers is different, the dimensions of the frequency domain compression matrices associated with different transmission layers may be different.

[0144] (3) The terminal determines the dimension of the frequency domain compression matrix based on the maximum number of the first subbands associated with all transmission layers. When the numbers of first subbands associated with different transmission layers are different, the dimensions of the frequency domain compression matrices associated with different transmission layers are the same.

[0145] Optionally, for the above methods (1)-(3), the network side device may indicate to the terminal through high-layer signaling to obtain the PMI based on one of the methods (1)-(3).

[0146] In the above implementation, after the terminal obtains multiple subband RIs, multiple PMI feedback amounts are associated in the CSI report, and each PMI feedback amount is associated with a transmission layer. When the codebook configured by the network is a codebook with a frequency domain compression step, the terminal can determine the dimension of the frequency domain compression matrix corresponding to each transmission layer. Since the values ​​of the ranks associated with different subband RIs may be different, it means that from the perspective of the entire bandwidth associated with the CSI report, the frequency band positions or PMI subbands (or PMI subband numbers) associated with different transmission layers may be different. For example, the three subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2, respectively, and RI0=2, RI1=1, RI2=2. At this time, the PMI feedback amount of layer0 (e.g., frequency domain basis vector indication) is associated with subband 0 / 1 / 2, and the PMI feedback amount of layer1 (e.g., frequency domain basis vector indication) is associated with subband 0 / 2. In other words, the terminal can determine the number of first subbands associated with each transmission layer based on multiple RIs, and further determine the dimension of the frequency domain compression matrix based on the number of first subbands associated with each transmission layer. The number of first subbands associated with different transmission layers may be different, that is, when the number of first subbands associated with different transmission layers is different, the dimensions of the frequency domain compression matrices associated with different transmission layers may be different.

[0147] Optionally, for the terminal to determine the dimension of the frequency domain compression matrix corresponding to each transmission layer, another implementation method is that the terminal determines the dimension of the frequency domain compression matrix based on the maximum number of PMI subbands associated with all transmission layers, and performs compression. It can be understood that the terminal determines the dimension of the frequency domain compression matrix based on the number of PMI subbands associated with all bandwidths associated with the CSI report, and it can also be understood that the dimension of the frequency domain compression matrix is ​​equal to the number of PMI subbands associated with all bandwidths associated with the CSI report. In this case, when the number of layers of some subbands RI is less than the number of layers of other subbands RI, the terminal can fill in the corresponding number of layers to ensure compression performance and avoid losing more PMI information, that is, the terminal can find at least one suitable precoding vector to fill in the number of layers, where each precoding vector is associated with one layer.

[0148] One implementation method for the terminal to find at least one suitable precoding vector to complete the number of layers is: when the number of layers of the subband RI is less than the maximum number of layers of all subband RIs, the terminal completes the number based on the precoding vector associated with the layer with the largest layer index or the precoding vector associated with the layer with the smallest layer index.

[0149] For example, the three subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2, and RI0=2, RI1=1, RI2=2. At this time, RI0 is associated with 2 columns of precoding vectors, which are associated with layer 0 / 1 respectively, RI1 is associated with 1 column of precoding vectors, which are associated with layer0 respectively, and RI2 is associated with 2 columns of precoding vectors, which are associated with layer 0 / 1 respectively. In order to perform frequency domain compression according to subband 0 / 1 / 2, the precoding matrix associated with RI1 lacks the precoding vector associated with layer1, which may result in failure to compress according to subband 0 / 1 / 2. At this time, for the precoding matrix associated with RI1, the terminal can fill in the gaps based on the precoding vector associated with the layer with the largest layer index. After filling, RI1 is associated with 2 columns of the same precoding vectors, which are associated with layer 0 / 1 respectively, that is, the precoding vector associated with layer1 associated with RI1 is the precoding vector associated with layer0 associated with RI1.

[0150] Another implementation method for the terminal to find at least one suitable precoding vector to complete the number of layers is: when the number of layers of the subband RI is less than the maximum number of layers of all subband RIs, the terminal obtains the precoding vector associated with the layer number to be completed based on the channel.

[0151] For example, the three subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2 respectively. The terminal obtains the precoding matrices A=[a1,a2,a3]; B=[b1,b2,b3]; C=[c1,c2,c3] according to subband 0 / 1 / 2 respectively. The terminal obtains RI0=2, RI1=1, RI2=2 according to the signal-to-noise ratio, that is, RI0 is associated with two precoding matrix vectors [a1,a2], RI1 is associated with one precoding matrix vector [b1], and RI2 is associated with two precoding matrix vectors [c1,c2]. At this time, RI0 is associated with two columns of precoding vectors, which are associated with layer 0 / 1 respectively, RI1 is associated with one column of precoding vectors, which are associated with layer 0 respectively, and RI2 is associated with two columns of precoding vectors, which are associated with layer 0 / 1 respectively. In order to perform frequency domain compression according to subband 0 / 1 / 2, the precoding matrix associated with RI1 lacks the precoding vector associated with layer1, which may result in failure to compress according to subband 0 / 1 / 2. At this time, for the precoding matrix associated with RI1, the terminal can obtain the precoding vector that needs to be supplemented based on the channel, that is, the terminal supplements the precoding vector associated with the default layer number. After supplementation, RI1 is associated with 2 columns of precoding vectors [b1, b2], respectively associated with layer 0 / 1. Further, optionally, the CQI associated with RI1 is calculated based on 1 column of precoding vectors [b1] instead of 2 columns of precoding vectors after supplementation.

[0152] Another implementation method for the terminal to find at least one suitable precoding vector to complete the number of layers may be: when the number of layers of the subband RI is less than the maximum number of layers of all subband RIs, the terminal completes the default precoding vector based on the zero vector.

[0153] For example, the three subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2, and RI0=2, RI1=1, and RI2=2. At this time, RI0 is associated with 2 columns of precoding vectors, which are associated with layer 0 / 1 respectively, RI1 is associated with 1 column of precoding vectors, which are associated with layer0 respectively, and RI2 is associated with 2 columns of precoding vectors, which are associated with layer 0 / 1 respectively. In order to perform frequency domain compression according to subband 0 / 1 / 2, the precoding matrix associated with RI1 lacks the precoding vector associated with layer1, which may make it impossible to compress according to subband 0 / 1 / 2. At this time, for the precoding matrix associated with RI1, the terminal constructs a dimensionally matched zero vector to fill the default layer1 precoding vector. After filling, RI1 is associated with 2 columns of precoding vectors, which are associated with layer 0 / 1 respectively, and the precoding vector associated with layer1 is a zero vector.

[0154] For the above implementation, the CQI associated with the same subband RI in the CSI report is calculated based on the number of layers indicated by the subband RI, which may be different from the number of layers associated with the PMI associated with the same subband RI in the CSI report. That is, the CQI associated with each subband RI is calculated based on the precoding vector associated with the layer indicated by the RI, rather than based on the precoding vector after padding.

[0155] Optionally, for the above implementation mode in which the terminal finds at least one suitable precoding vector to complete the number of layers, the network may indicate an implementation mode to the terminal through high-layer signaling.

[0156] In an optional implementation, when the dimensions of frequency domain compression matrices associated with different transmission layers are different or the numbers of first subbands associated with different transmission layers are different, and there is a PMI feedback amount used to indicate the non-zero coefficient indication associated with the PMI, the non-zero coefficient indication associated with the transmission layer with a smaller frequency domain compression matrix dimension is a subset of the non-zero coefficient indication associated with the transmission layer with the largest frequency domain compression matrix dimension. It can be understood that the transmission layer with a smaller frequency domain compression matrix dimension shares the non-zero coefficient indication with the transmission layer with the largest frequency domain compression matrix dimension, and the non-zero coefficient indication of the transmission layer with a smaller frequency domain compression matrix dimension is a partial non-zero coefficient indication of the shared non-zero coefficient indication. In this way, the overhead of the non-zero coefficient indication can be reduced.

[0157] In an optional implementation, there is at least one PMI feedback amount associated with multiple second PMI feedback amounts in the CSI report, and each of the second PMI feedback amounts is associated with one of the subband RIs, and when the frequency domain resources associated with different subband RIs are different, for a certain transmission layer, the non-zero coefficient indication associated with the subband RI with a smaller dimension of the associated frequency domain compression matrix is ​​a subset of the non-zero coefficient indication associated with the subband RI with the largest dimension of the associated frequency domain compression matrix. It can be understood that the subband RI with a smaller dimension of the frequency domain compression matrix shares the non-zero coefficient indication with the subband RI with the largest dimension of the frequency domain compression matrix, and the non-zero coefficient indication of the subband RI with a smaller dimension of the frequency domain compression matrix is ​​a partial non-zero coefficient indication of the shared non-zero coefficient indication. For example: the non-zero coefficient indication associated with the first K frequency domain basis vectors of the shared non-zero coefficient indication, where K is the number of selected frequency domain basis vectors associated with the subband RI with a smaller dimension of the frequency domain compression matrix. In this way, the overhead of the non-zero coefficient indication can be reduced.

[0158] In one implementation, when the CSI report is associated with multiple PMI feedback quantities, at least one PMI feedback quantity includes multiple sub-feedback quantities, each of which corresponds to one sub-band RI or sub-band RI group, wherein the sub-band RI group is associated with at least one sub-band RI. In this implementation, when the CSI report is associated with multiple PMI feedback quantities, at least one feedback quantity can be divided into multiple sub-feedback quantities, each of which corresponds to one sub-band RI or sub-band RI group; wherein the sub-band RI group is associated with at least one sub-band RI, or the frequency band association associated with the sub-band RI group indicates a frequency band associated with a sub-band RI. Further, the division of the sub-band RI group or the number of sub-band RI groups may be related to the reporting bandwidth associated with the CSI report; for example, when the bandwidth is greater than a threshold, there will be multiple sub-band groups, or the number of sub-band groups increases with the increase of bandwidth. For another example: the frequency domain basis vector indication feedback amount may include multiple frequency domain basis vector indications, each frequency domain basis vector indication is associated with a subband RI, which can also be understood as the terminal obtaining the frequency domain basis vector indication or the frequency domain compression matrix based on the number of PMI subbands associated with each subband RI.

[0159] In one implementation, when the terminal feeds back the CSI report, if the size of the CSI report is larger than the resource carrying the CSI report, the terminal may discard part of the content in the CSI report according to at least one of the following principles:

[0160] (1) according to the order of multiple RIs in the first part of the CSI report, first discard the CSI part associated with the last RI in the first part, and then discard the CSI part associated with the second to last RI in the first part, until the size of the CSI report is less than or equal to the resources carrying the CSI report; wherein the CSI part includes at least one of a PMI feedback amount, a CQI, and a LI.

[0161] (2) According to the order of the transport layers associated with the CSI report, the CSI part associated with the transport layer with the largest layer number is discarded first, and then the CSI part associated with the transport layer with the second largest layer number is discarded, until the size of the CSI report is less than or equal to the resource carrying the CSI report. The CSI part includes at least one of the PMI feedback amount, CQI, and LI.

[0162] In this implementation, for the above-mentioned CSI report associated with multiple sub-band RIs, part of the content of the CSI report may be discarded when the resources carrying the CSI report are insufficient. The discarding can be understood as not feeding back to the network or no longer feeding back to the network on the current channel resources.

[0163] In order to better retain as much useful information as possible, the discarding rules include at least one of the following:

[0164] 1. Discard in the order of multiple subband RI indications in Part 1 of the CSI report, first discard the CSI part associated with the last subband RI indication, then discard the CSI part associated with the second to last subband RI indication, and so on. The CSI part includes at least one of PMI, CQI, and LI. The last subband RI indication can be understood as the subband RI indication that is last mapped to UCI, or the subband RI indication with the lowest position in UCI among all subband RIs. In this way, when sending the discard rule, the complete CSI information of more subbands can be retained as much as possible. Further optionally, for PMI, CQI, and LI in the CSI part, the protocol can also agree on a mapping order, and discard them in sequence based on this order.

[0165] 2. Discard in the order of the layers associated with the CSI report, first discard the CSI part associated with the layer with the largest layer number, then discard the CSI part associated with the layer with the second largest layer number, and so on. The CSI part includes at least one of the PMI, CQI, and LI associated with the layer. In this way, when sending the discard rule, the complete CSI information of more layers can be retained as much as possible. Further optionally, for the PMI, CQI, and LI in the CSI part, the protocol can also agree on a mapping order, and discard them in sequence based on this order. For example: 3 subband RIs (RI0 / 1 / 2) are associated with subband 0 / 1 / 2, and RI0=2, RI1=1, and RI2=2. At this time, RI0 is associated with 2 columns of precoding vectors, which are associated with layer 0 / 1 respectively, RI1 is associated with 1 column of precoding vectors, which are associated with layer 0 respectively, and RI2 is associated with 2 columns of precoding vectors, which are associated with layer 0 / 1 respectively. If discarding occurs, the CSI content associated with RI0 and RI2 associated with layer 1 is discarded first, and then the CSI content associated with RI0, RI1 and RI2 associated with layer 0 is discarded.

[0166] In particular, the above two rules can exist at the same time, that is, the discarding order can be to discard the CSI part associated with the layer with the largest sequence number first, and then discard the CSI part associated with the layer with the second largest sequence number, and so on. For the CSI parts associated with the layers with the same sequence number, further discard the CSI part associated with the last subband RI indication first, and then discard the CSI part associated with the second to last subband RI indication, and so on. Alternatively, the discarding order can be to discard the CSI part associated with the last subband RI indication first, and then discard the CSI part associated with the second to last subband RI indication, and so on. For all layers associated with the same subband RI, first discard the CSI part associated with the layer with the largest sequence number, and then discard the CSI part associated with the layer with the second to last layer number, and so on.

[0167] Through the technical solution provided in the embodiments of the present application, the terminal or network side device can flexibly configure the granularity of the RI of a CSI report. In addition, when multiple sub-band RIs are included in the CSI report, other CSI contents (PMI, CQI, LI, CRI) can be acquired and fed back based on the multiple sub-band RIs, so that CSI in large bandwidth conditions can be acquired more flexibly and accurately.

[0168] Optionally, the association described in the embodiments of the present application is not limited to the following explanations:

[0169] A is associated with B, which means A is B;

[0170] A is associated with B, which means that B can be obtained through A;

[0171] A is associated with B, which means that B can be determined through A.

[0172] Based on the same technical concept, an embodiment of the present application also provides a method for obtaining a CSI report.

[0173] Figure 3 A flow chart of a method for obtaining a CSI report provided in an embodiment of the present application is shown. The method 300 can be performed by a network-side device. In other words, the method can be performed by software or hardware installed on the network-side device. If necessary, the following embodiment only describes the operation of the network-side device. For other matters not covered, please refer to the above description of the method 200.

[0174] like Figure 3 As shown, the method mainly includes the following steps.

[0175] S310, a network side device receives a CSI report fed back by a terminal based on a frequency domain rank indication format configuration.

[0176] The frequency domain rank indication format configuration includes at least one of the following:

[0177] (1) The frequency domain granularity of the RI in the CSI report, where the frequency domain granularity is used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of subband or a wideband RI with a frequency domain granularity of wideband;

[0178] (2) a first number of subband RIs associated with the CSI reporting frequency band associated with the CSI report;

[0179] (3) frequency domain resources associated with each subband RI in the CSI report;

[0180] (4) A second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0181] In one implementation, before the network side device receives the CSI report fed back by the terminal based on the frequency domain rank indication format configuration, the method may further include at least one of the following:

[0182] Step 1: The network side device sends a first network high-layer signaling to the terminal, wherein the first network high-layer signaling is used to indicate the frequency domain rank indication format configuration;

[0183] Step 2: The network side device sends a second network high-layer signaling to the terminal, wherein the second network high-layer signaling is used to instruct the terminal to obtain the frequency domain rank indication format configuration according to the measured channel.

[0184] In one implementation, before the network side device receives the CSI report fed back by the terminal based on the frequency domain rank indication format configuration, the method may further include at least one of the following:

[0185] Step 1: The network side device sends a third network high-layer signaling to the terminal, wherein the third network high-layer signaling is used to indicate the size of the frequency domain resources associated with each of the sub-band RIs;

[0186] Step 2: The network side device sends a fourth network high-layer signaling to the terminal, wherein the fourth network high-layer signaling is used to indicate a first number of the sub-band RIs associated with the CSI reporting band;

[0187] Step 3: The network side device sends a fifth network high-layer signaling to the terminal, wherein the fifth network high-layer signaling is used to indicate the number of rank value restrictions associated with the CSI reporting frequency band;

[0188] Step 4: The network side device sends a sixth network high-layer signaling to the terminal, wherein the sixth network high-layer signaling is used to indicate at least one division method of all first sub-bands;

[0189] Step 5: The network side device sends a seventh network high-layer signaling to the terminal, wherein the seventh network high-layer signaling is used to indicate a division method of at least one CSI reporting frequency band.

[0190] In one implementation, the method may further include at least one of the following:

[0191] Step 1: The network side device determines the multiple subband RIs based on a reference RI and multiple subband differential RIs sent by the terminal, wherein one of the subband differential RIs indicates a difference value of a rank value between the subband RI and the reference RI;

[0192] Step 2, the network side device determines the multiple sub-band RIs based on the multiple sub-band RIs mapped in the first part of the CSI report;

[0193] Step 3, the network side device determines multiple CRIs associated with the CSI report, each of the CRIs is associated with one subband RI;

[0194] Step 4, the network side device determines that the granularity of the CQI associated with the CSI report is a subband;

[0195] Step 5, the network side device determines that the granularity of the PMI associated with the CSI report is a subband;

[0196] Step 6: The network side device determines the subband group associated with each subband RI based on the division results of all the first subbands associated with the CSI report carried in the CSI report, and the division results of all the first subbands include at least one of the following: the number of subband groups, the division method, the frequency domain position of the subband group, and the starting frequency domain position of the subband group; wherein the division method can be a division method indicated by the sixth network high-layer signaling mentioned above.

[0197] Step 7: The network side device determines the second subband associated with each subband RI based on the division result of the CSI report frequency band carried in the CSI report, and the division result of the CSI report frequency band includes at least one of the following: the number of second subbands, the size of the second subband, the division method, the position of the second subband, and the starting position of the second subband; wherein the division method can be a division method indicated by the seventh network high-layer signaling mentioned above.

[0198] Step 8: The network side device determines the number of target objects associated with the CSI report, where the number of target objects is related to the number of multiple sub-band RIs, wherein the target objects include at least one of the following: a CSI processing unit, an activated resource, and an activated resource port.

[0199] In one implementation, the method may further include: a network-side device receiving the multiple sub-band RIs fed back by the terminal, and determining at least one of the following based on the multiple sub-band RIs:

[0200] In a case where a plurality of subband RIs are associated with the same rank value, determining that all CQIs associated with the CSI report fed back by the terminal are associated with a first bandwidth, where the first bandwidth is a bandwidth associated with the CSI report or a CSI report frequency band associated with the CSI report;

[0201] Determining that some of the multiple CQIs associated with the CSI report are associated with bandwidths that are not completely the same;

[0202] Determine that the CSI report is associated with a plurality of CQIs, each of the CQIs being associated with one of the subband RIs;

[0203] Determining the number of codewords associated with different sub-band RIs;

[0204] determining that at least one PMI feedback amount in the CSI report is associated with multiple first PMI feedback amounts, each of the first PMI feedback amounts is associated with a transmission layer, some of the multiple first PMI feedback amounts are associated with the entire bandwidth associated with the CSI report, and some of the multiple first PMI feedback amounts are associated with part of the bandwidth associated with the CSI report;

[0205] Determine that at least one PMI feedback amount is associated with multiple second PMI feedback amounts in the CSI report, and each of the second PMI feedback amounts is associated with one of the subband RIs;

[0206] Determine that at least one PMI feedback amount in the CSI report is associated with a third PMI feedback amount, and the third PMI feedback amount is associated with all transmission layers and all the subband RIs;

[0207] Determining that a layer indication is associated with the CSI report;

[0208] In the case where a plurality of sub-band RIs are associated with rank values ​​that are not completely the same, the network-side device determines that a plurality of layer indications are associated in the CSI report, and each layer indication is associated with one sub-band RI.

[0209] In one implementation, when the network side device determines that there is at least one PMI feedback amount associated with multiple first PMI feedback amounts in the CSI report, and each of the first PMI feedback amounts is associated with a transmission layer, the method further includes at least one of the following:

[0210] The network side device determines the number of first subbands associated with each transmission layer by using a plurality of subband RIs;

[0211] The network side device determines that the dimension of the frequency domain compression matrix is ​​determined by the number of first subbands associated with each transmission layer;

[0212] The network side device determines the dimension of the frequency domain compression matrix by the maximum number of the first subbands associated with all transmission layers.

[0213] Through the above technical solution provided in the embodiment of the present application, the network side device can flexibly configure the granularity of the RI of a CSI report, and can more flexibly and accurately obtain CSI under large bandwidth conditions.

[0214] The CSI report feedback method provided in the embodiment of the present application may be executed by a CSI report feedback device. In the embodiment of the present application, the CSI report feedback method performed by the CSI report feedback device is taken as an example to illustrate the CSI report feedback device provided in the embodiment of the present application.

[0215] Figure 4 A schematic diagram of the structure of a CSI report feedback device provided in an embodiment of the present application is shown, Figure 4 As shown, the device 400 mainly includes: a first acquisition module 401 , a determination module 402 , a second acquisition module 403 and a feedback module 404 .

[0216] In the embodiment of the present application, a first acquisition module 401 is used to acquire a frequency domain rank indication format configuration; a determination module 402 is used to determine the rank indication information associated with the CSI report to be fed back based on the frequency domain rank indication format configuration, wherein the rank indication information includes at least one of the following: the number of rank indication RIs, and the frequency domain position associated with each RI; a second acquisition module 403 is used to acquire the CSI report based on the rank indication information; a feedback module 404 is used to feed back the CSI report; wherein the frequency domain rank indication format configuration includes at least one of the following: the CSI The frequency domain granularity of the RI in the CSI report, wherein the frequency domain granularity is used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of a subband or to indicate that the RI in the CSI report is a wideband RI with a frequency domain granularity of a wideband; the first number of subband RIs associated with the CSI report frequency band associated with the CSI report; the frequency domain resources associated with each subband RI in the CSI report; the second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0217] In one implementation, obtaining the frequency domain rank indication format configuration includes one of the following:

[0218] Based on the first network high-layer signaling, obtaining the frequency domain rank indication format configuration;

[0219] Based on the second network high-layer signaling, it is determined that the frequency domain rank indication format configuration is determined by the terminal, and the frequency domain rank indication format configuration is obtained according to the measured channel.

[0220] In one implementation, the determination module 402 is also used to determine that the frequency domain granularity of the RI associated with the CSI report is broadband when the first acquisition module 401 obtains the frequency domain rank indication format configuration based on the first network high-layer signaling and when the first network high-layer signaling related to the frequency domain rank indication format configuration is not obtained.

[0221] In one implementation, determining the rank indication information associated with the CSI report to be fed back based on the frequency domain rank indication format configuration includes:

[0222] In a case where the frequency domain rank indication format configuration includes the first number or the second number, the multiple first subbands associated with the CSI report are divided based on the first number or the second number, and the first subband associated with each subband RI is determined.

[0223] In one implementation, the number of first sub-bands associated with each of the sub-band RIs is not completely the same.

[0224] In one implementation, the frequency domain rank indication format configuration satisfies at least one of the following:

[0225] The number of first subbands associated with each of the subband RIs is related to the bandwidth associated with the CSI report for each of the subbands;

[0226] In a case where the bandwidth associated with the CSI report exceeds a predetermined threshold, the RI in the CSI report is a subband RI.

[0227] In one implementation, the number of first subbands associated with each subband RI increases as the bandwidth associated with the CSI report increases; or,

[0228] The number of subband RIs in the CSI report increases as the bandwidth associated with the CSI report increases.

[0229] In one implementation, obtaining the frequency domain rank indication format configuration includes at least one of the following:

[0230] Determine, according to a third network high-layer signaling or protocol agreement, a size of a frequency domain resource associated with each of the sub-band RIs, and then determine, based on the size of the CSI reporting frequency band and the size of the frequency domain resource associated with each of the sub-band RIs, a first number of the sub-band RIs associated with the CSI reporting frequency band;

[0231] According to the fourth network high-layer signaling or protocol agreement, the first number of the sub-band RIs associated with the CSI reporting band is determined, and then the size of the frequency domain resources associated with each sub-band RI is determined according to the size of the CSI reporting band and the first number.

[0232] In one implementation, the size of the frequency domain resources associated with each of the sub-band RIs is related to the size of the frequency domain resources associated with the PMI sub-band or the CQI sub-band.

[0233] In one implementation, the feedback module 404 is further configured to, when determining multiple subband RIs associated with the CSI report to be fed back based on the frequency domain rank indication format configuration, perform at least one of the following:

[0234] Indicating the determined multiple sub-band RIs to a network side device through a reference RI and multiple sub-band differential RIs, wherein one of the sub-band differential RIs indicates a difference value of a rank value between the sub-band RI and the reference RI;

[0235] Mapping the multiple subband RIs into a first part of the CSI report;

[0236] Divide all the first subbands associated with the CSI report into multiple subband groups, each of the subband groups being associated with one subband RI;

[0237] Divide the CSI reporting frequency band into a plurality of second sub-bands, each of the second sub-bands being associated with one of the sub-band RIs;

[0238] Determine the number of rank value restrictions associated with the CSI report, when the number of rank value restrictions associated with the CSI report is 1, the multiple subband RIs are associated with the same rank value restriction, and when the number of rank value restrictions associated with the CSI report is multiple, the multiple subband RIs are associated with rank value restrictions that are not completely the same;

[0239] Determine a plurality of CRIs associated with the CSI report, each of the CRIs being associated with one of the subband RIs;

[0240] Determine the number of target objects associated with the CSI report, where the number of target objects is related to the number of the multiple subband RIs, wherein the target objects include at least one of the following: a CSI processing unit, an activated resource, and an activated resource port;

[0241] Determine that the granularity of the CQI associated with the CSI report is a subband;

[0242] The granularity of the PMI associated with the CSI report is determined to be a subband.

[0243] In one implementation, the feedback module 404 is further used to carry the division results of all the first subbands in the CSI report to indicate to the network side device, and the division results include at least one of the following: the number of the subband groups, the division method, the frequency domain position of the subband group, and the starting frequency domain position of the subband group.

[0244] In one implementation, the feedback module 404 is also used to carry the division result of the CSI report frequency band in the CSI report to indicate to the network side device, and the division result includes at least one of the following: the number of second sub-bands, the size of the second sub-band, the division method, the position of the second sub-band, and the starting position of the second sub-band.

[0245] In one implementation, obtaining the CSI report based on the rank indication information includes:

[0246] Based on the rank indication information, the RI associated with the CSI report is acquired.

[0247] In one implementation, when the RI associated with the CSI report is multiple subband RIs, obtaining the CSI report based on the rank indication information further includes at least one of the following:

[0248] In a case where a plurality of the subband RIs are associated with the same rank value, determining that all CQIs associated with the CSI report are associated with a first bandwidth, where the first bandwidth is a bandwidth associated with the CSI report or a CSI report frequency band associated with the CSI report;

[0249] In a case where the plurality of subband RIs are associated with rank values ​​that are not completely the same, determining that at least some of the plurality of CQIs associated with the CSI report are associated with bandwidths or frequency domain resources that are not completely the same;

[0250] In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that the CSI report is associated with multiple CQIs, each of the CQIs being associated with one subband RI;

[0251] In the case where the CSI report is associated with multiple codewords, determining that different numbers of codewords are associated with different subband RIs;

[0252] In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that at least one PMI feedback amount in the CSI report is associated with multiple first PMI feedback amounts, each of the first PMI feedback amounts is associated with a transmission layer, some of the multiple first PMI feedback amounts are associated with the entire bandwidth associated with the CSI report, and some of the multiple first PMI feedback amounts are associated with part of the bandwidth associated with the CSI report;

[0253] In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that at least one PMI feedback amount in the CSI report is associated with multiple second PMI feedback amounts, each of the second PMI feedback amounts being associated with one subband RI;

[0254] In a case where a plurality of the sub-band RIs are associated with the same rank value, determining that at least one PMI feedback amount in the CSI report is associated with a third PMI feedback amount, wherein the third PMI feedback amount is associated with all transmission layers and all the sub-band RIs;

[0255] In a case where the same rank value is associated with a plurality of the subband RIs, determining that a layer indication is associated with the CSI report;

[0256] In the case that a plurality of the subband RIs are associated with rank values ​​that are not completely the same, it is determined that a plurality of layer indications are associated with the CSI report, and each of the layer indications is associated with one of the subband RIs.

[0257] In one implementation, when some of the multiple CQIs associated with the CSI report are associated with different bandwidths, the multiple CQIs satisfy one of the following:

[0258] The multiple CQIs are wideband CQIs, each of the wideband CQIs is associated with at least one transmission layer, and for each of the wideband CQIs, the CSI report includes multiple first subband differential CQIs, and the multiple first subband differential CQIs are associated with a second bandwidth, where the second bandwidth is a bandwidth associated with the wideband CQI;

[0259] The multiple CQIs share one wideband CQI in the CSI report, and the CSI report also includes multiple second subband differential CQIs, each of which is associated with a transmission layer and one of the subband RIs.

[0260] In one implementation, the determination module 402 is further configured to determine the number of codewords associated with the CSI report in at least one of the following ways:

[0261] Determined according to the average of the rank values ​​associated with all the sub-band RIs;

[0262] Determined according to a weighted average of the rank values ​​associated with all the sub-band RIs, wherein the weight factor of the rank value associated with each sub-band RI is related to the bandwidth associated with the sub-band RI;

[0263] Determined according to the rank value associated with the broadband RI.

[0264] In one implementation, the feedback module 404 is further configured to, when at least one PMI feedback amount is associated with multiple first PMI feedback amounts in the CSI report, and each of the first PMI feedback amounts is associated with a transmission layer, perform at least one of the following:

[0265] Determine the number of first subbands associated with each transmission layer based on the multiple subband RIs;

[0266] Determining a frequency domain compression matrix dimension based on the number of first subbands associated with each transmission layer;

[0267] The frequency domain compression matrix dimension is determined based on a maximum number of the numbers of first subbands associated with all transmission layers.

[0268] In one implementation, when the CSI report is associated with multiple PMI feedback amounts, there is at least one PMI feedback amount including multiple sub-feedback amounts, each of the sub-feedback amounts corresponds to one sub-band RI or sub-band RI group, wherein the sub-band RI group is associated with at least one sub-band RI.

[0269] In one implementation, feeding back the CSI report includes:

[0270] In the case where the size of the CSI report is larger than the resource carrying the CSI report, part of the content of the CSI report is discarded according to at least one of the following principles:

[0271] According to the order of multiple RIs in the first part of the CSI report, the CSI part associated with the last RI in the first part is discarded first, and then the CSI part associated with the second to last RI in the first part is discarded, until the size of the CSI report is less than or equal to the resources carrying the CSI report;

[0272] According to the order of the transport layers associated with the CSI report, the CSI part associated with the transport layer with the largest layer number is discarded first, and then the CSI part associated with the transport layer with the second largest layer number is discarded, until the size of the CSI report is less than or equal to the resources carrying the CSI report.

[0273] The feedback device of the CSI report in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than a terminal. For example, the terminal may include but is not limited to the types of terminals 11 listed above, and other devices may be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0274] The CSI report feedback device provided in the embodiment of the present application can achieve Figure 2 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0275] Figure 5 A schematic diagram of the structure of a device for obtaining a CSI report provided in an embodiment of the present application is shown as follows: Figure 5 As shown, the device 500 mainly includes: a transmission module 501 and a third acquisition module 502.

[0276] In an embodiment of the present application, a transmission module 501 is used to receive a CSI report fed back by a terminal based on a frequency domain rank indication format configuration; a third acquisition module 502 is used to acquire the CSI report; wherein the frequency domain rank indication format configuration includes at least one of the following: a frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI with a frequency domain granularity of a subband or to indicate that the RI in the CSI report is a wideband RI with a frequency domain granularity of a wideband; a first number of subband RIs associated with the CSI report frequency band associated with the CSI report; frequency domain resources associated with each subband RI in the CSI report; a second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0277] In one implementation, the transmission module 501 is further configured to:

[0278] Sending a first network high-layer signaling to the terminal, wherein the first network high-layer signaling is used to indicate the frequency domain rank indication format configuration;

[0279] Sending a second network high-layer signaling to the terminal, wherein the second network high-layer signaling is used to instruct the terminal to obtain the frequency domain rank indication format configuration according to the measured channel.

[0280] In one implementation, the transmission module 501 is further configured to:

[0281] Sending a third network high-layer signaling to the terminal, wherein the third network high-layer signaling is used to indicate a size of a frequency domain resource associated with each of the sub-band RIs;

[0282] Sending a fourth network high-layer signaling to the terminal, wherein the fourth network high-layer signaling is used to indicate a first number of the sub-band RIs associated with the CSI reporting band;

[0283] Sending a fifth network high-layer signaling to the terminal, wherein the fifth network high-layer signaling is used to indicate the number of rank value restrictions associated with the CSI reporting frequency band;

[0284] Sending a sixth network high-layer signaling to the terminal, wherein the sixth network high-layer signaling is used to indicate at least one division method of all first subbands;

[0285] Sending a seventh network high-layer signaling to the terminal, wherein the seventh network high-layer signaling is used to indicate a division method of at least one CSI reporting frequency band.

[0286] In one implementation, the third acquisition module 502 is further configured to:

[0287] Determine the multiple subband RIs based on a reference RI and multiple subband differential RIs sent by the terminal, wherein one of the subband differential RIs indicates a difference value of a rank value between the subband RI and the reference RI;

[0288] Determine the multiple subband RIs based on the multiple subband RIs mapped in the first part of the CSI report;

[0289] Determine a plurality of CRIs associated with the CSI report, each of the CRIs being associated with one of the subband RIs;

[0290] Determine that the granularity of the CQI associated with the CSI report is a subband;

[0291] Determine that the granularity of the PMI associated with the CSI report is a subband;

[0292] Determine, based on the division results of all first subbands associated with the CSI report carried in the CSI report, a subband group associated with each subband RI, wherein the division results of all first subbands include at least one of the following: the number of subband groups, the division method, the frequency domain position of the subband group, and the starting frequency domain position of the subband group;

[0293] Determine, based on the division result of the CSI report frequency band carried in the CSI report, a second subband associated with each of the subband RIs, where the division result of the CSI report frequency band includes at least one of the following: the number of second subbands, the size of the second subband, the division method, the position of the second subband, and the starting position of the second subband;

[0294] Determine the number of target objects associated with the CSI report, where the number of target objects is related to the number of the multiple sub-band RIs, wherein the target objects include at least one of the following: a CSI processing unit, an activated resource, and an activated resource port.

[0295] In one implementation, the third acquisition module 502 is further configured to receive the multiple sub-band RIs fed back by the terminal, and determine at least one of the following based on the multiple sub-band RIs:

[0296] In a case where a plurality of subband RIs are associated with the same rank value, determining that all CQIs associated with the CSI report fed back by the terminal are associated with a first bandwidth, where the first bandwidth is a bandwidth associated with the CSI report or a CSI report frequency band associated with the CSI report;

[0297] In a case where the plurality of subband RIs are associated with rank values ​​that are not completely the same, determining that at least some of the plurality of CQIs associated with the CSI report are associated with bandwidths or frequency domain resources that are not completely the same;

[0298] In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that the CSI report is associated with multiple CQIs, each of the CQIs being associated with one subband RI;

[0299] In the case where the CSI report is associated with multiple codewords, determining that different numbers of codewords are associated with different subband RIs;

[0300] In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that at least one PMI feedback amount in the CSI report is associated with multiple first PMI feedback amounts, each of the first PMI feedback amounts is associated with a transmission layer, some of the multiple first PMI feedback amounts are associated with the entire bandwidth associated with the CSI report, and some of the multiple first PMI feedback amounts are associated with part of the bandwidth associated with the CSI report;

[0301] In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that at least one PMI feedback amount in the CSI report is associated with multiple second PMI feedback amounts, each of the second PMI feedback amounts being associated with one subband RI;

[0302] In a case where a plurality of the sub-band RIs are associated with the same rank value, determining that at least one PMI feedback amount in the CSI report is associated with a third PMI feedback amount, wherein the third PMI feedback amount is associated with all transmission layers and all the sub-band RIs;

[0303] In a case where the same rank value is associated with a plurality of the subband RIs, determining that a layer indication is associated with the CSI report;

[0304] In the case that a plurality of the subband RIs are associated with rank values ​​that are not completely the same, it is determined that a plurality of layer indications are associated with the CSI report, and each of the layer indications is associated with one of the subband RIs.

[0305] In one implementation, the third acquisition module 502 is further configured to:

[0306] Determining the number of first subbands associated with each transmission layer is determined by a plurality of said subband RIs;

[0307] Determining a frequency domain compression matrix dimension is determined by the number of first subbands associated with each transmission layer;

[0308] The dimension of the frequency domain compression matrix is ​​determined by the maximum number of the numbers of first subbands associated with all transmission layers.

[0309] The CSI report acquisition device provided in the embodiment of the present application can achieve Figure 3 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0310] like Figure 6As shown, the embodiment of the present application further provides a communication device 600, including a processor 601 and a memory 602, and the memory 602 stores a program or instruction that can be run on the processor 601. For example, when the communication device 600 is a terminal, the program or instruction is executed by the processor 601 to implement the various steps of the above-mentioned CSI report feedback method embodiment, and can achieve the same technical effect. When the communication device 600 is a network side device, the program or instruction is executed by the processor 601 to implement the various steps of the above-mentioned CSI report acquisition method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0311] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 2 The steps in the method embodiment shown. 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 can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Figure 7 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0312] The terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709 and at least some of the components of a processor 710.

[0313] Those skilled in the art will appreciate that the terminal 700 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 710 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Figure 7 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0314] It should be understood that in the embodiment of the present application, the input unit 704 may include a graphics processing unit (GPU) 7041 and a microphone 7042, and the graphics processing unit 7041 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 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 707 includes a touch panel 7071 and at least one of other input devices 7072. The touch panel 7071 is also called a touch screen. The touch panel 7071 may include two parts: a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, a physical keyboard, function keys (such as a volume control button, a switch button, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0315] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 701 can transmit the data to the processor 710 for processing; in addition, the RF unit 701 can send uplink data to the network side device. Generally, the RF unit 701 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0316] The memory 709 can be used to store software programs or instructions and various data. The memory 709 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, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 709 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. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 709 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0317] The processor 710 may include one or more processing units; optionally, the processor 710 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 710.

[0318] The processor 710 is configured to obtain a frequency domain rank indication format configuration; determine rank indication information associated with a CSI report to be fed back based on the frequency domain rank indication format configuration, wherein the rank indication information includes at least one of the following: the number of rank indications RIs, and the frequency domain positions associated with each RI; based on the rank indication information, obtain the CSI report;

[0319] The radio frequency unit 701 is configured to feed back the CSI report;

[0320] The frequency domain rank indication format configuration includes at least one of the following:

[0321] The frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI having a frequency domain granularity of subband or to indicate that the RI in the CSI report is a wideband RI having a frequency domain granularity of wideband;

[0322] a first number of subband RIs associated with a CSI reporting frequency band associated with the CSI report;

[0323] The frequency domain resources associated with each subband RI in the CSI report;

[0324] The second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

[0325] 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 effect. To avoid repetition, it will not be repeated here.

[0326] The embodiment of the present application also 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 used to run a program or instruction to implement the following Figure 3 The steps of the method embodiment shown. This network side device embodiment corresponds to the above network side device method embodiment, and each implementation process and implementation mode of the above method embodiment can be applied to this network side device embodiment and can achieve the same technical effect.

[0327] Specifically, the embodiment of the present application also provides a network side device. Figure 8 As shown, the network side device 800 includes: an antenna 801, a radio frequency device 802, a baseband device 803, a processor 804 and a memory 805. The antenna 801 is connected to the radio frequency device 802. In the uplink direction, the radio frequency device 802 receives information through the antenna 801 and sends the received information to the baseband device 803 for processing. In the downlink direction, the baseband device 803 processes the information to be sent and sends it to the radio frequency device 802. The radio frequency device 802 processes the received information and sends it out through the antenna 801.

[0328] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 803, which includes a baseband processor.

[0329] The baseband device 803 may include, for example, at least one baseband board on which a plurality of chips are arranged. Figure 8As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 805 through a bus interface to call the program in the memory 805 to execute the network device operations shown in the above method embodiment.

[0330] The network side device may further include a network interface 806, which is, for example, a Common Public Radio Interface (CPRI).

[0331] Specifically, the network side device 800 of the embodiment of the present application further includes: instructions or programs stored in the memory 805 and executable on the processor 804, and the processor 804 calls the instructions or programs in the memory 805 to execute. Figure 5 The methods executed by the modules shown achieve the same technical effects, and therefore will not be described here in detail to avoid repetition.

[0332] An embodiment of the present application further provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned CSI report feedback method embodiment is implemented, or each process of the above-mentioned CSI report acquisition method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0333] 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-transient readable storage medium.

[0334] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement each process of the above-mentioned CSI report feedback method embodiment, or to implement each process of the above-mentioned CSI report acquisition method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0335] 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.

[0336] An embodiment of the present application further provides a computer program / program product, which is stored in a storage medium, and is executed by at least one processor to implement the various processes of the above-mentioned CSI report feedback method embodiment, or to implement the various processes of the above-mentioned CSI report acquisition method embodiment, and can achieve the same technical effect. To avoid repetition, it is not repeated here.

[0337] An embodiment of the present application also provides a CSI report feedback system, including: a terminal and a network side device, wherein the terminal can be used to execute the steps of the CSI report feedback method as described above, and the network side device can be used to execute the steps of the CSI report acquisition method as described above.

[0338] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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 one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment 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 reverse 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.

[0339] Through the description of the above implementation methods, 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 hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0340] 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 the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. A method for feedback of channel state information (CSI) report, It is characterized in that include: The terminal obtains a frequency domain rank indication format configuration; The terminal determines, based on the frequency domain rank indication format configuration, rank indication information associated with the CSI report to be fed back, wherein the rank indication information includes at least one of the following: the number of rank indications RIs, and the frequency domain positions associated with each RI; The terminal obtains and feeds back the CSI report based on the rank indication information; The frequency domain rank indication format configuration includes at least one of the following: The frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI having a frequency domain granularity of subband or to indicate that the RI in the CSI report is a wideband RI having a frequency domain granularity of wideband; a first number of subband RIs associated with a CSI reporting frequency band associated with the CSI report; The frequency domain resources associated with each subband RI in the CSI report; The second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a precoding matrix indication PMI subband, and a channel quality indication CQI subband.

2. The method according to claim 1, It is characterized in that The terminal obtains a frequency domain rank indication format configuration, including one of the following: The terminal obtains the frequency domain rank indication format configuration based on the first network high-layer signaling; The terminal determines, based on the second network high-layer signaling, that the frequency domain rank indication format configuration is determined by the terminal, and the terminal obtains the frequency domain rank indication format configuration according to the measured channel.

3. The method according to claim 2, It is characterized in that In a case where the terminal obtains the frequency domain rank indication format configuration based on the first network high layer signaling, the method further includes: In a case where the terminal does not obtain the first network high-layer signaling related to the frequency-domain rank indication format configuration, the terminal determines that the frequency-domain granularity of the RI associated with the CSI report is broadband.

4. The method according to any one of claims 1 to 3, It is characterized in that The terminal determines, based on the frequency domain rank indication format configuration, rank indication information associated with the CSI report to be fed back, including: In a case where the frequency domain rank indication format configuration includes the first number or the second number, the terminal divides the multiple first subbands associated with the CSI report based on the first number or the second number, and determines the first subband associated with each of the subband RIs.

5. The method according to claim 4, It is characterized in that The number of first sub-bands associated with each of the sub-band RIs is not completely the same.

6. The method according to any one of claims 1 to 5, It is characterized in that The frequency domain rank indication format configuration satisfies at least one of the following: The number of first subbands associated with each subband RI is related to the bandwidth associated with the CSI report; In a case where the bandwidth associated with the CSI report exceeds a predetermined threshold, the RI in the CSI report is a subband RI.

7. The method according to claim 6, It is characterized in that The number of first subbands associated with each subband RI increases as the bandwidth associated with the CSI report increases; or, The number of subband RIs in the CSI report increases as the bandwidth associated with the CSI report increases.

8. The method according to any one of claims 1 to 6, It is characterized in that The terminal obtains a frequency domain rank indication format configuration, including at least one of the following: The terminal determines, according to a third network high-layer signaling or protocol agreement, a size of a frequency domain resource associated with each of the sub-band RIs, and then determines a first number of the sub-band RIs associated with the CSI reporting band based on a size of the CSI reporting band and a size of the frequency domain resource associated with each of the sub-band RIs; The terminal determines the first number of the sub-band RIs associated with the CSI reporting band according to the fourth network high-layer signaling or protocol agreement, and then determines the size of the frequency domain resources associated with each sub-band RI according to the size of the CSI reporting band and the first number.

9. The method according to claim 8, It is characterized in that The size of the frequency domain resources associated with each of the sub-band RIs is related to the size of the frequency domain resources associated with the PMI sub-band or the CQI sub-band.

10. The method according to any one of claims 1 to 9, It is characterized in that The method further comprises: In a case where the terminal determines multiple subband RIs associated with the CSI report to be fed back based on the frequency domain rank indication format configuration, the terminal performs at least one of the following: The terminal indicates the determined multiple sub-band RIs to the network side device through a reference RI and multiple sub-band differential RIs, wherein one of the sub-band differential RIs indicates a differential value of a rank value between the sub-band RI and the reference RI; Mapping, by the terminal, the multiple subband RIs into a first part of the CSI report; The terminal divides all the first subbands associated with the CSI report into multiple subband groups, and each subband group is associated with one subband RI; The terminal divides the CSI report frequency band into a plurality of second sub-bands, and each of the second sub-bands is associated with one sub-band RI; The terminal determines the number of rank value restrictions associated with the CSI report, and when the number of rank value restrictions associated with the CSI report is 1, the multiple subband RIs are associated with the same rank value restriction, and when the number of rank value restrictions associated with the CSI report is multiple, the multiple subband RIs are associated with different rank value restrictions; The terminal determines a plurality of CSI reference signal resource indications CRIs associated with the CSI report, each of the CRIs being associated with one of the subband RIs; The terminal determines the number of target objects associated with the CSI report, where the number of target objects is related to the number of the multiple subband RIs, wherein the target object includes at least one of the following: a CSI processing unit, an activated resource, and an activated resource port; The terminal determines that the granularity of the CQI associated with the CSI report is a subband; The terminal determines that the granularity of the PMI associated with the CSI report is a subband.

11. The method according to claim 10, It is characterized in that The method also includes: the terminal carries the division results of all the first subbands in the CSI report to indicate to the network side device, and the division results include at least one of the following: the number of the subband groups, the division method, the frequency domain position of the subband group, and the starting frequency domain position of the subband group.

12. The method according to claim 10, It is characterized in that The method also includes: the terminal carries the division result of the CSI report frequency band in the CSI report to indicate to the network side device, and the division result includes at least one of the following: the number of second sub-bands, the size of the second sub-band, the division method, the position of the second sub-band, and the starting position of the second sub-band.

13. The method according to any one of claims 1 to 12, It is characterized in that The terminal obtains the CSI report based on the rank indication information, including: The terminal acquires the RI associated with the CSI report based on the rank indication information.

14. The method according to claim 13, It is characterized in that In a case where the RI associated with the CSI report is a plurality of subband RIs, the terminal acquiring the CSI report based on the rank indication information further includes at least one of the following: In a case where a plurality of subband RIs are associated with the same rank value, the terminal determines that all CQIs associated with the CSI report are associated with a first bandwidth, where the first bandwidth is a bandwidth associated with the CSI report or a CSI report frequency band associated with the CSI report; In a case where the plurality of subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that at least some of the plurality of CQIs associated with the CSI report are associated with bandwidths or frequency domain resources that are not completely the same; In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that the CSI report is associated with multiple CQIs, each of which is associated with one subband RI; In a case where the CSI report is associated with multiple codewords, the terminal determines that different numbers of codewords are associated with different subband RIs; In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that there is at least one PMI feedback amount in the CSI report associated with multiple first PMI feedback amounts, each of the first PMI feedback amounts is associated with a transmission layer, some of the multiple first PMI feedback amounts are associated with the entire bandwidth associated with the CSI report, and some of the multiple first PMI feedback amounts are associated with the partial bandwidth associated with the CSI report; In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, the terminal determines that there is at least one PMI feedback amount associated with multiple second PMI feedback amounts in the CSI report, and each of the second PMI feedback amounts is associated with one subband RI; In a case where a plurality of the subband RIs are associated with the same rank value, the terminal determines that at least one PMI feedback amount in the CSI report is associated with a third PMI feedback amount, and the third PMI feedback amount is associated with all transmission layers and all the subband RIs; In a case where the same rank value is associated with a plurality of the subband RIs, the terminal determines that a layer indication is associated with the CSI report; In the case that the multiple sub-band RIs are associated with rank values ​​that are not completely the same, the terminal determines that the CSI report is associated with multiple layer indications, and each layer indication is associated with one sub-band RI.

15. The method according to claim 14, It is characterized in that In the case where some of the multiple CQIs associated with the CSI report are associated with different bandwidths, the multiple CQIs satisfy one of the following: The multiple CQIs are wideband CQIs, each of the wideband CQIs is associated with at least one transmission layer, and for each of the wideband CQIs, the CSI report includes multiple first subband differential CQIs, and the multiple first subband differential CQIs are associated with a second bandwidth, where the second bandwidth is a bandwidth associated with the wideband CQI; The multiple CQIs share one wideband CQI in the CSI report, and the CSI report also includes multiple second subband differential CQIs, each of which is associated with a transmission layer and one of the subband RIs.

16. The method according to claim 14, It is characterized in that The method further comprises: The number of codewords associated with the CSI report is determined in at least one of the following ways: Determined according to the average of the rank values ​​associated with all the sub-band RIs; Determined according to a weighted average of the rank values ​​associated with all the sub-band RIs, wherein the weight factor of the rank value associated with each sub-band RI is related to the bandwidth associated with the sub-band RI; Determined according to the rank value associated with the broadband RI.

17. The method according to claim 14, It is characterized in that In a case where the terminal determines that at least one PMI feedback amount is associated with multiple first PMI feedback amounts in the CSI report, and each of the first PMI feedback amounts is associated with a transmission layer, the method further includes at least one of the following: The terminal determines, based on the multiple sub-band RIs, the number of first sub-bands associated with each transmission layer; The terminal determines, based on the number of first subbands associated with each transmission layer, a frequency domain compression matrix dimension; The terminal determines a frequency domain compression matrix dimension based on a maximum number of first subbands associated with all transmission layers.

18. The method according to claim 14, It is characterized in that In the case where the CSI report is associated with multiple PMI feedback amounts, there is at least one PMI feedback amount including multiple sub-feedback amounts, each of the sub-feedback amounts corresponds to one sub-band RI or sub-band RI group, wherein the sub-band RI group is associated with at least one sub-band RI.

19. The method according to any one of claims 1 to 18, It is characterized in that The terminal feeding back the CSI report includes: In the case where the size of the CSI report is larger than the resource carrying the CSI report, the terminal discards part of the content of the CSI report according to at least one of the following principles: According to the order of multiple RIs in the first part of the CSI report, the CSI part associated with the last RI in the first part is discarded first, and then the CSI part associated with the second to last RI in the first part is discarded, until the size of the CSI report is less than or equal to the resources carrying the CSI report; According to the order of the transport layers associated with the CSI report, the CSI part associated with the transport layer with the largest layer number is discarded first, and then the CSI part associated with the transport layer with the second largest layer number is discarded, until the size of the CSI report is less than or equal to the resources carrying the CSI report.

20. A method for obtaining a CSI report, It is characterized in that include: The network side device receives a CSI report fed back by the terminal based on a frequency domain rank indication format configuration, wherein the frequency domain rank indication format configuration includes at least one of the following: The frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI having a frequency domain granularity of subband or to indicate that the RI in the CSI report is a wideband RI having a frequency domain granularity of wideband; a first number of subband RIs associated with a CSI reporting frequency band associated with the CSI report; The frequency domain resources associated with each subband RI in the CSI report; The second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

21. The method according to claim 20, It is characterized in that Before the network side device receives the CSI report fed back by the terminal based on the frequency domain rank indication format configuration, the method further includes at least one of the following: The network side device sends a first network high-layer signaling to the terminal, wherein the first network high-layer signaling is used to indicate the frequency domain rank indication format configuration; The network side device sends a second network high-layer signaling to the terminal, wherein the second network high-layer signaling is used to instruct the terminal to obtain the frequency domain rank indication format configuration according to the measured channel.

22. The method according to claim 20 or 21, It is characterized in that Before the network side device receives the CSI report fed back by the terminal based on the frequency domain rank indication format configuration, the method further includes at least one of the following: The network side device sends a third network high-layer signaling to the terminal, wherein the third network high-layer signaling is used to indicate a size of a frequency domain resource associated with each of the sub-band RIs; The network side device sends a fourth network high-layer signaling to the terminal, wherein the fourth network high-layer signaling is used to indicate a first number of the sub-band RIs associated with the CSI reporting frequency band; The network side device sends a fifth network high-layer signaling to the terminal, wherein the fifth network high-layer signaling is used to indicate the number of rank value restrictions associated with the CSI reporting frequency band; The network side device sends a sixth network high-layer signaling to the terminal, wherein the sixth network high-layer signaling is used to indicate at least one division method of all first sub-bands; The network side device sends a seventh network high-layer signaling to the terminal, wherein the seventh network high-layer signaling is used to indicate a division method of at least one CSI reporting frequency band.

23. The method according to any one of claims 20 to 22, It is characterized in that The method further comprises at least one of the following: The network side device determines the multiple subband RIs based on a reference RI and multiple subband differential RIs sent by the terminal, wherein one of the subband differential RIs indicates a difference value of a rank value between the subband RI and the reference RI; The network side device determines the multiple sub-band RIs based on the multiple sub-band RIs mapped in the first part of the CSI report; The network side device determines a plurality of CRIs associated with the CSI report, each of the CRIs being associated with one of the subband RIs; The network side device determines that the granularity of the CQI associated with the CSI report is a subband; The network side device determines that the granularity of the PMI associated with the CSI report is a subband; The network side device determines, based on the division results of all first subbands associated with the CSI report carried in the CSI report, a subband group associated with each subband RI, where the division results of all first subbands include at least one of the following: the number of subband groups, the division method, the frequency domain position of the subband group, and the starting frequency domain position of the subband group; The network side device determines, based on the division result of the CSI report frequency band carried in the CSI report, a second subband associated with each subband RI, where the division result of the CSI report frequency band includes at least one of the following: the number of second subbands, the size of the second subband, the division method, the position of the second subband, and the starting position of the second subband; The network side device determines the number of target objects associated with the CSI report, where the number of target objects is related to the number of multiple sub-band RIs, wherein the target objects include at least one of the following: a CSI processing unit, an activated resource, and an activated resource port.

24. The method according to any one of claims 20 to 22, It is characterized in that The method further comprises: The network-side device receives the multiple sub-band RIs fed back by the terminal, and determines at least one of the following based on the multiple sub-band RIs: In a case where a plurality of subband RIs are associated with the same rank value, determining that all CQIs associated with the CSI report fed back by the terminal are associated with a first bandwidth, where the first bandwidth is a bandwidth associated with the CSI report or a CSI report frequency band associated with the CSI report; In a case where the plurality of subband RIs are associated with rank values ​​that are not completely the same, determining that at least some of the plurality of CQIs associated with the CSI report are associated with bandwidths or frequency domain resources that are not completely the same; In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that the CSI report is associated with multiple CQIs, each of the CQIs being associated with one subband RI; In the case where the CSI report is associated with multiple codewords, determining that different numbers of codewords are associated with different subband RIs; In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that at least one PMI feedback amount in the CSI report is associated with multiple first PMI feedback amounts, each of the first PMI feedback amounts is associated with a transmission layer, some of the multiple first PMI feedback amounts are associated with the entire bandwidth associated with the CSI report, and some of the multiple first PMI feedback amounts are associated with part of the bandwidth associated with the CSI report; In a case where the multiple subband RIs are associated with rank values ​​that are not completely the same, determining that at least one PMI feedback amount in the CSI report is associated with multiple second PMI feedback amounts, each of the second PMI feedback amounts being associated with one subband RI; In a case where a plurality of the sub-band RIs are associated with the same rank value, determining that at least one PMI feedback amount in the CSI report is associated with a third PMI feedback amount, wherein the third PMI feedback amount is associated with all transmission layers and all the sub-band RIs; In a case where the same rank value is associated with a plurality of the subband RIs, determining that a layer indication is associated with the CSI report; In the case where a plurality of the sub-band RIs are associated with rank values ​​that are not completely the same, the network-side device determines that a plurality of layer indications are associated in the CSI report, and each of the layer indications is associated with one of the sub-band RIs.

25. The method according to claim 24, It is characterized in that In a case where the network side device determines that at least one PMI feedback amount is associated with multiple first PMI feedback amounts in the CSI report, and each of the first PMI feedback amounts is associated with a transmission layer, the method further includes at least one of the following: The network side device determines the number of first subbands associated with each transmission layer by using a plurality of subband RIs; The network side device determines that the dimension of the frequency domain compression matrix is ​​determined by the number of first subbands associated with each transmission layer; The network side device determines the dimension of the frequency domain compression matrix by the maximum number of the first subbands associated with all transmission layers.

26. A CSI report feedback device, It is characterized in that include: A first acquisition module, used to acquire a frequency domain rank indication format configuration; A determination module, configured to determine, based on the frequency domain rank indication format configuration, rank indication information associated with the CSI report to be fed back, wherein the rank indication information includes at least one of the following: the number of rank indications RI, and the frequency domain position associated with each RI; A second acquisition module, configured to acquire the CSI report based on the rank indication information; A feedback module, configured to feed back the CSI report; The frequency domain rank indication format configuration includes at least one of the following: The frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI having a frequency domain granularity of subband or to indicate that the RI in the CSI report is a wideband RI having a frequency domain granularity of wideband; a first number of subband RIs associated with a CSI reporting frequency band associated with the CSI report; The frequency domain resources associated with each subband RI in the CSI report; The second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

27. A device for obtaining a CSI report, It is characterized in that include: A transmission module, configured to receive a CSI report fed back by a terminal based on a frequency domain rank indication format configuration; A third acquisition module, configured to acquire the CSI report; The frequency domain rank indication format configuration includes at least one of the following: The frequency domain granularity of the RI in the CSI report, the frequency domain granularity being used to indicate that the RI in the CSI report is a subband RI having a frequency domain granularity of subband or to indicate that the RI in the CSI report is a wideband RI having a frequency domain granularity of wideband; a first number of subband RIs associated with a CSI reporting frequency band associated with the CSI report; The frequency domain resources associated with each subband RI in the CSI report; The second number of first subbands associated with each subband RI in the CSI report, wherein the first subband includes one of the following: a CSI report subband, a PMI subband, and a CQI subband.

28. A terminal, It is characterized in that The method 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 method according to any one of claims 1 to 19 are implemented.

29. A network side device, It is characterized in that The method 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 method according to any one of claims 20 to 25 are implemented.

30. A readable storage medium, It is characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by a processor, the steps of the method according to any one of claims 1 to 19 are implemented, or the steps of the method according to any one of claims 20 to 25 are implemented.

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