WO2023131042A1 - 信道状态信息csi反馈方法、装置、终端及网络侧设备 - Google Patents

信道状态信息csi反馈方法、装置、终端及网络侧设备 Download PDF

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Publication number
WO2023131042A1
WO2023131042A1 PCT/CN2022/143287 CN2022143287W WO2023131042A1 WO 2023131042 A1 WO2023131042 A1 WO 2023131042A1 CN 2022143287 W CN2022143287 W CN 2022143287W WO 2023131042 A1 WO2023131042 A1 WO 2023131042A1
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Prior art keywords
csi
bitmap
rss
terminal
side device
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PCT/CN2022/143287
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English (en)
French (fr)
Inventor
塔玛拉卡拉盖施
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维沃移动通信有限公司
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Publication of WO2023131042A1 publication Critical patent/WO2023131042A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0675—Space-time coding characterised by the signaling
    • H04L1/0693—Partial feedback, e.g. partial channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • the present application belongs to the technical field of communication, and in particular relates to a channel state information (CSI) feedback method, device, terminal and network side equipment.
  • CSI channel state information
  • the current technology supports Type II Channel State Information (Type II CSI), the terminal measures based on the configured Channel State Information Reference Signal (CSI-RS) and feeds back multiple beams according to the relevant configuration Index and each beam corresponds to the amplitude and phase information feedback of each frequency domain subband.
  • Type II CSI Channel State Information
  • CSI-RS Channel State Information Reference Signal
  • the current technology further supports the evolved Type II CSI.
  • Type II CSI On the basis of Type II CSI, the precoding matrix is compressed in the frequency domain and fed back.
  • the feedback information includes a bitmap, which indicates that each beam is After the domain is compressed, the corresponding coefficient is 0 or 1. 0 indicates that the amplitude and phase corresponding to the coefficient are not fed back, and 1 indicates that the amplitude and phase corresponding to the coefficient are fed back.
  • the CSI feedback method in the current technology is only applicable to a single-point transmission system. How to configure channel measurement pilots in a multi-point transmission system and how the terminal feeds back Type II CSI is not yet supported by the current technology.
  • Embodiments of the present application provide a channel state information CSI feedback method, device, terminal and network side equipment, which can solve the problem of how to feed back CSI in a multipoint transmission system.
  • a channel state information CSI feedback method including:
  • the terminal determines N channel state information reference signals CSI-RS to be measured; N is an integer greater than 1;
  • the terminal measures the N CSI-RSs to obtain CSI; wherein, the CSI includes: transmission rank, beam indexes corresponding to the P CSI-RSs, and bitmaps corresponding to the P CSI-RSs, the bit The bitmap is used to indicate the frequency-domain compressed coefficient of the feedback beam of the CSI-RS; P is an integer less than or equal to N;
  • the terminal sends the CSI to the network side device.
  • a channel state information CSI feedback method including:
  • the network side device receives the CSI fed back by the terminal after measuring N CSI-RSs, the CSI includes: transmission rank, beam indexes corresponding to the P CSI-RSs, and bitmaps corresponding to the P CSI-RSs, the The bitmap is used to indicate the frequency-domain compressed coefficient of the feedback beam of the CSI-RS; N is an integer greater than 1; P is an integer less than or equal to N.
  • a channel state information CSI feedback device including:
  • the first determination module is configured to determine N channel state information reference signals CSI-RS to be measured; N is an integer greater than 1;
  • the second determination module is configured to measure the N CSI-RSs to obtain CSI; wherein the CSI includes: transmission rank, beam indexes corresponding to the P CSI-RSs, and bits corresponding to the P CSI-RSs A bitmap, the bitmap is used to indicate the frequency-domain compressed coefficient of the feedback beam of the CSI-RS; P is an integer less than or equal to N;
  • a sending module configured to send the CSI to the network side device.
  • a channel state information CSI feedback device including:
  • the receiving module is configured to receive CSI fed back by the terminal after measuring N CSI-RSs, where the CSI includes: transmission rank, beam indexes corresponding to P CSI-RSs, and bitmaps corresponding to P CSI-RSs, The bitmap is used to indicate the frequency-domain compressed coefficient of the CSI-RS beam to be fed back; N is an integer greater than 1; P is an integer less than or equal to N.
  • a terminal in a fifth aspect, includes a processor and a memory, the memory stores programs or instructions that can run on the processor, and when the programs or instructions are executed by the processor, the following The steps of the method in one aspect.
  • a terminal including a processor and a communication interface, wherein the processor is used to determine N channel state information reference signals CSI-RS to be measured; N is an integer greater than 1; measure the N CSI-RS to obtain CSI; wherein, the CSI includes: transmission rank, beam index corresponding to P CSI-RS respectively, and bitmap corresponding to P CSI-RS, the bitmap is used to indicate The CSI-RS needs to feed back the coefficient of the frequency domain compressed beam; P is an integer less than or equal to N; the communication interface is used to send the CSI to the network side device.
  • a network-side device in a seventh aspect, includes a processor and a memory, the memory stores programs or instructions that can run on the processor, and the programs or instructions are executed by the processor When realizing the steps of the method as described in the second aspect.
  • a network side device including a processor and a communication interface, wherein the communication interface is used to receive CSI fed back by the terminal after measuring N CSI-RSs, and the CSI includes: transmission rank, P The beam indexes corresponding to the CSI-RSs, and the bitmaps corresponding to the P CSI-RSs, the bitmaps are used to indicate the frequency-domain compressed coefficients of the feedback beams of the CSI-RSs; N is greater than 1 Integer; P is an integer less than or equal to N.
  • a ninth aspect provides a communication system, including: a terminal and a network-side device, the terminal can be used to perform the steps of the method for channel state information CSI feedback as described in the first aspect, and the network-side device can be used to perform the steps as described in the first aspect The steps of the channel state information CSI feedback method described in the second aspect.
  • a readable storage medium is provided, and a program or an instruction is stored on the readable storage medium, and 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 as described in the first aspect are implemented, or the The steps of the method described in the second aspect.
  • a chip in an eleventh aspect, includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or an instruction to implement the method described in the first aspect. method, or implement the method as described in the second aspect.
  • a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement the The steps of the method, or the steps to realize the method as described in the second aspect.
  • the terminal reports a CSI after measuring multiple CSI-RS, and the CSI carries the bit corresponding to the CSI-RS determined by the terminal according to the network configuration or the pre-agreed mapping rule
  • the network-side device can determine the mapping relationship between the bitmap in the CSI and the frequency-domain compressed coefficient of the CSI-RS to be fed back according to the corresponding mapping rules, so that the terminal and the network-side device can compare the bitmap
  • the understanding of the graph is consistent, and the correct transmission efficiency of CSI is improved.
  • FIG. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application is applicable
  • FIG. 2 shows one of the flow charts of the channel state information CSI feedback method provided by the embodiment of the present application
  • FIG. 3 shows the second flowchart of the steps of the channel state information CSI feedback method provided by the embodiment of the present application
  • FIG. 4 shows an example diagram of a multipoint transmission system of Example 1 provided by the embodiment of the present application
  • FIG. 5 shows one of the structural schematic diagrams of the channel state information CSI feedback device provided by the embodiment of the present application
  • FIG. 6 shows the second structural diagram of the channel state information CSI feedback device provided by the embodiment of the present application.
  • FIG. 7 shows a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 8 shows a schematic structural diagram of a terminal provided in an embodiment of the present application.
  • FIG. 9 shows a schematic structural diagram of a network-side device provided by an embodiment of the present application.
  • first, second and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein and that "first" and “second” distinguish objects. It is usually one category, and the number of objects is not limited. For example, there may be one or more first objects.
  • “and/or” in the description and claims means at least one of the connected objects, and the character “/” generally means that the related objects are an "or” relationship.
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced
  • LTE-A Long Term Evolution-Advanced
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • FDMA Frequency Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single-carrier Frequency Division Multiple Access
  • system and “network” in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned system and radio technology, and can also be used for other systems and radio technologies.
  • NR New Radio
  • the following description describes the New Radio (NR) system for illustrative purposes, and uses NR terminology in most of the following descriptions, but these techniques can also be applied to applications other than NR system applications, such as the 6th generation (6 th Generation, 6G) communication system.
  • 6G 6th Generation
  • Fig. 1 shows a block diagram of a wireless communication system to which the embodiment of the present application is applicable.
  • the wireless communication system includes a terminal 11 and a network side device 12 .
  • the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, a super mobile personal computer (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) equipment, robot, wearable device (Wearable Device) , Vehicle User Equipment (VUE), Pedestrian User Equipment (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (personal computer, PC), teller machine or self-service machine and other terminal side devices, wearable devices include: smart watches, smart bracelet
  • the network side device 12 may include an access network device or a core network device, where the access network device 12 may also be called a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function, or Wireless access network unit.
  • RAN Radio Access Network
  • RAN Radio Access Network
  • Wireless access network unit Wireless access network unit
  • the access network device 12 may include a base station, a WLAN access point, or a WiFi node, etc., and the base station may be called a Node B, an evolved Node B (eNB), an access point, a Base Transceiver Station (Base Transceiver Station, BTS), a radio Base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B, Home Evolved Node B, Transmitting Receiving Point (TRP) or all As long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary. It should be noted that in this embodiment of the 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.
  • channel state information CSI feedback method, device, terminal and network side equipment provided in the embodiments of the present application are described in detail below through some embodiments and application scenarios with reference to the accompanying drawings.
  • this embodiment of the present application provides a channel state information CSI feedback method, including:
  • Step 201 the terminal determines N channel state information reference signals CSI-RS to be measured; N is an integer greater than 1;
  • Step 202 the terminal measures the N CSI-RSs to obtain CSI; wherein, the CSI includes: transmission rank (rank), beam indexes corresponding to the P CSI-RSs, and bits corresponding to the P CSI-RSs A bitmap, the bitmap is used to indicate the frequency-domain compressed coefficient of the feedback beam of the CSI-RS; P is an integer less than or equal to N;
  • Step 203 the terminal sends the CSI to the network side device.
  • the number of ports of each CSI-RS may be the same or different, and the number of ports of each CSI-RS is a positive integer greater than 1.
  • the above CSI is an evolved Type II CSI (may be referred to as eType II CSI for short), that is, the terminal compresses the precoding matrix corresponding to the beam to be fed back to the CSI-RS in the frequency domain
  • Feedback in CSI that is, the fed back CSI includes bitmaps corresponding to P CSI-RSs, and the bitmaps are used to indicate that the coefficients of the CSI-RSs to be fed back after being compressed in the frequency domain are 0 or 1, and 0 means The amplitude and phase corresponding to this coefficient are not fed back, and 1 means that the amplitude and phase corresponding to this coefficient are fed back.
  • P may be equal to N, that is, all N CSI-RSs measured by the terminal are fed back in CSI.
  • P may be smaller than N, that is, the terminal flexibly selects part of the measured N CSI-RSs to feed back in CSI.
  • the CSI further includes: identification information of the P CSI-RSs, such as CSI-RS indexes (CSI-RS index, CRI) of the P CSI-RSs.
  • the CRI indicates the CSI-RS selected by the terminal. This manner may also be referred to as an explicit indication by the terminal to indicate its flexibly selected CSI-RS.
  • the terminal may also use an implicit indication to indicate its flexibly selected CSI-RS, that is, P is equal to N, but in the bitmap corresponding to N CSI-RS, the unselected All bits corresponding to the CSI-RS are set to 0.
  • step 201 includes:
  • the terminal receives the N CSI-RS configured by the network side device; that is, the activation operation is not required on the network side, and the terminal directly measures the configured N CSI-RS;
  • step 201 includes:
  • the terminal receives M CSI-RSs configured by the network side device, and receives activation signaling; the activation signaling is used to activate N CSI-RSs in the M CSI-RSs; where M is an integer greater than N .
  • the activation signaling may be MAC CE (Medium Access Control Control Element, media access control layer control unit) or DCI (Downlink Control Information, downlink control information).
  • the method further includes:
  • the terminal receives the total number of beams that need to be fed back by the N CSI-RS configured by the network-side device, and determines the number of beams that need to be fed back by each CSI-RS according to the total number of beams; or, the terminal receives each CSI-RS configured by the network-side device The number of beams to be fed back respectively;
  • the terminal determines beam indexes corresponding to the P CSI-RS respectively according to the number of beams to be fed back by each CSI-RS.
  • the network side device further configures the number of beams (basic vectors) that the terminal needs to feed back.
  • the total number can be configured as L, or the number of beams can be configured separately for N CSI-RS, such as L 1 , L 2 ,..., L N.
  • the terminal maps the total number L of beams to N CSI-RSs according to predefined rules.
  • the number of beams corresponding to each CSI-RS is the same (L is divisible by N) or the number of beams corresponding to the last CSI-RS is different from other CSI-RSs (L cannot be divided by N divisible).
  • the number of corresponding beams is determined according to the number of ports of each CSI-RS. For example, the number of ports of CSI-RS 1 is 4, and the number of ports of CSI-RS 2 is 8. Then The number of beams corresponding to CSI-RS 2 is twice the number of beams corresponding to CSI-RS 1.
  • the method also includes:
  • the terminal receives one or more values of the subband precoding matrix indicator (Precoding Matrix Indicator, PMI) configured by the network side device;
  • Precoding Matrix Indicator, PMI Precoding Matrix Indicator
  • the terminal performs frequency-domain compression on the precoding matrices respectively corresponding to the P CSI-RSs according to one or more values of the subband PMI, and determines frequency-domain compressed coefficients of the P CSI-RSs to be fed back.
  • N CSI-RSs can share the value; or, when the network side device is configured with multiple values of subband PMI
  • each CSI-RS corresponds to a value; optionally, at least two CSI-RS correspond to different sub-band PMI values.
  • the network side device when the number of beams is configured as the total number L, the network side device only configures one value of the subband PMI; when N CSI-RSs respectively configure the number of beams, the network side device can configure a common value of the subband PMI Or respectively configure N values of subband PMI (that is, one CSI-RS corresponds to one value of PMI).
  • the method also includes:
  • the bitmap corresponding to the P CSI-RSs includes: a bitmap, and the bitmap maps coefficients of the P CSI-RSs to be fed back beams compressed in the frequency domain;
  • the bitmaps corresponding to the P CSI-RSs include: a plurality of bitmaps, each bitmap maps a frequency-domain compressed coefficient of a CSI-RS to be fed back to a beam;
  • the bitmap corresponding to the P CSI-RSs is determined by the terminal according to network configuration or pre-agreement.
  • the network-side device can configure the terminal to feed back a bitmap (bitmap) corresponding to multiple CSI-RSs; or, the network-side device can configure the terminal to feed back a bitmap (bitmap) corresponding to each CSI-RS. Multiple bitmaps.
  • the network side device does not configure the number of bitmaps to be fed back, one bitmap is fed back to the terminal by default.
  • pre-agreement can be understood as predetermining that the bitmaps corresponding to P CSI-RSs include: one bitmap or multiple bitmaps through signaling interaction between the terminal and the network side device; it can also be understood as The bitmaps corresponding to P CSI-RSs are stipulated by the agreement to include: one bitmap or multiple bitmaps; that is, it is determined that the terminal feeds back a bitmap (bitmap) corresponding to multiple CSI-RSs; or, the terminal is determined The bitmap (bitmap) corresponding to each CSI-RS is fed back, that is, it is determined that the terminal feeds back multiple bitmaps.
  • the method also includes:
  • the terminal uses the network configuration or the pre-agreed mapping rule to feed back the P CSI-RS beams through frequency
  • the coefficients after domain compression are mapped to a bitmap.
  • P 4, which are respectively the first CSI-RS, the second CSI-RS, the third CSI-RS, and the fourth CSI-RS; All the frequency-domain compressed coefficients of the -RS and the fourth CSI-RS to be fed back are mapped to a bitmap to obtain 1 bitmap.
  • the method further includes:
  • the terminal compresses the frequency-domain compressed coefficients of each CSI-RS beam to be fed back according to the network configuration or the pre-agreed mapping rule Mapped to the corresponding bitmap.
  • P 4, respectively the first CSI-RS, the second CSI-RS, the third CSI-RS, and the fourth CSI-RS;
  • the coefficients are mapped to a bitmap, and the terminal maps the frequency domain compressed coefficients of the second CSI-RS feedback beams to a bitmap, and the terminal compresses the frequency domain compression of the third CSI-RS feedback beams.
  • the final coefficients are mapped to a bitmap, and the terminal maps the frequency-domain compressed coefficients of the fourth CSI-RS to be fed back to a bitmap to obtain 4 bitmaps.
  • the transmission rank (rank) included in the CSI is greater than 1, it indicates that the CSI-RS corresponds to at least two transmission layers, and the bitmap corresponding to each transmission layer can be separately fed back in the CSI, or can be fed back according to After certain rules are cascaded, they are fed back in CSI.
  • mapping rules include at least one of the following:
  • Rule 1 according to the priority order of CSI-RS, map to the bitmap; where, the priority of CSI-RS can be determined by signal strength (such as Reference Signal Received Power (RSRP));
  • RSRP Reference Signal Received Power
  • Rule 4 according to the order of the identification size of the coefficients of the CSI-RS feedback beams compressed in the frequency domain, map them to the bitmap;
  • Rule 6 Map to the bitmap according to the priority order of the transmission layer corresponding to the CSI-RS.
  • the priority among the above-mentioned rules 1-6 can also be determined by network configuration or pre-agreement. If it needs to be discarded (such as insufficient resources or resource conflicts, etc.), then the latter mapping will be discarded first. However, it needs to be ensured that the terminal and the network side device have the same understanding of each rule and the priority of each rule.
  • the mapping rule is rule 2 first, then rule 3, and then rule 4.
  • the corresponding relationship of each bit in the bitmap may be: the first coefficient of the first beam of the first CSI-RS, the second coefficient of the first beam of the first CSI-RS, ..., the first coefficient of the second beam of the first CSI-RS, the second coefficient of the second beam of the first CSI-RS, ..., the first of the second CSI-RS The first coefficient of the beam, the second coefficient of the first beam of the second CSI-RS, ..., the first coefficient of the second beam of the second CSI-RS, the second CSI-RS The second coefficient of the first beam of , ... .
  • the mapping rule is rule 4 first and rule 3 second.
  • the corresponding relationship of each bit in the bitmap may be: the first coefficient of the first beam of the first CSI-RS, the first coefficient of the second beam of the first CSI-RS, ..., the second coefficient of the first beam of the second CSI-RS, the second coefficient of the second beam of the second CSI-RS, ....
  • the mapping rule is priority rule 5, then rule 2, then rule 3, and then rule 4.
  • the terminal reports a CSI after measuring multiple CSI-RS, and the CSI carries the bit corresponding to the CSI-RS determined by the terminal according to the network configuration or the pre-agreed mapping rule
  • the network-side device can determine the mapping relationship between the bitmap in the CSI and the frequency-domain compressed coefficient of the CSI-RS to be fed back according to the corresponding mapping rules, so that the terminal and the network-side device can compare the bitmap
  • the understanding of the graph is consistent, and the correct transmission efficiency of CSI is improved.
  • the embodiment of the present application also provides a channel state information CSI feedback method, including:
  • Step 301 the network side device receives the CSI fed back by the terminal after measuring N CSI-RSs, the CSI includes: transmission rank, beam indexes corresponding to P CSI-RSs, and bitmaps corresponding to P CSI-RSs , the bitmap is used to indicate the frequency-domain compressed coefficient of the CSI-RS beam to be fed back; N is an integer greater than 1; P is an integer less than or equal to N.
  • the number of ports of each CSI-RS may be the same or different, and the number of ports of each CSI-RS is a positive integer greater than 1.
  • the above CSI is an evolved Type II CSI (may be referred to as eType II CSI for short), that is, the terminal compresses the precoding matrix corresponding to the beam to be fed back to the CSI-RS in the frequency domain
  • Feedback in CSI that is, the fed back CSI includes bitmaps corresponding to P CSI-RSs, and the bitmaps are used to indicate that the coefficients of the CSI-RSs to be fed back after being compressed in the frequency domain are 0 or 1, and 0 means The amplitude and phase corresponding to this coefficient are not fed back, and 1 means that the amplitude and phase corresponding to this coefficient are fed back.
  • P may be equal to N, that is, all N CSI-RSs measured by the terminal are fed back in CSI.
  • P may be smaller than N, that is, the terminal flexibly selects part of the measured N CSI-RSs to feed back in CSI.
  • the CSI further includes: identification information of the P CSI-RSs, such as CSI-RS indexes (CSI-RS index, CRI) of the P CSI-RSs.
  • the CRI indicates the CSI-RS selected by the terminal. This manner may also be referred to as an explicit indication by the terminal to indicate its flexibly selected CSI-RS.
  • the terminal may also use an implicit indication to indicate its flexibly selected CSI-RS, that is, P is equal to N, but in the bitmap corresponding to N CSI-RS, the unselected All bits corresponding to the CSI-RS are set to 0.
  • the method also includes:
  • the network-side device configures N CSI-RSs for the terminal; that is, no activation operation is required on the network side, and the terminal directly measures the configured N CSI-RSs;
  • the network side device configures M CSI-RSs for the terminal, and sends an activation signaling to the terminal; the activation signaling is used to indicate the activation of N CSI-RSs among the M CSI-RSs; where M is greater than N an integer of .
  • the activation signaling may be MAC CE (Medium Access Control Control Element, media access control layer control unit) or DCI (Downlink Control Information, downlink control information).
  • the method further includes:
  • the network side device configures the total number of beams that need to be fed back by N CSI-RS for the terminal;
  • the network side device configures, for the terminal, the number of beams to be fed back by each CSI-RS.
  • the network side device further configures the number of beams (basic vectors) that the terminal needs to feed back.
  • the total number can be configured as L, or the number of beams can be configured separately for N CSI-RS, such as L 1 , L 2 ,..., L N.
  • the terminal maps the total number L of beams to N CSI-RSs according to predefined rules.
  • the number of beams corresponding to each CSI-RS is the same (L is divisible by N) or the number of beams corresponding to the last CSI-RS is different from other CSI0RS (L cannot be divisible by N ).
  • the number of corresponding beams is determined according to the number of ports of each CSI-RS. For example, the number of ports of CSI-RS 1 is 4, and the number of ports of CSI-RS 2 is 8. Then The number of beams corresponding to CSI-RS 2 is twice the number of beams corresponding to CSI-RS 1.
  • the method also includes:
  • the network side device configures the subband precoding matrix to indicate one or more values of the PMI for the terminal.
  • N CSI-RSs can share the value; or, when the network side device is configured with multiple values of subband PMI
  • each CSI-RS corresponds to a value; optionally, different CSI-RSs correspond to different sub-band PMI values.
  • the network side device when the number of beams is configured as the total number L, the network side device only configures one value of the subband PMI; when N CSI-RSs respectively configure the number of beams, the network side device can configure a common value of the subband PMI Or respectively configure N values of subband PMI (that is, one CSI-RS corresponds to one value of PMI).
  • the method also includes:
  • the network side device configures for the terminal that the CSI fed back by the terminal includes one bitmap or multiple bitmaps;
  • the bitmap maps the frequency-domain compressed coefficients of P CSI-RS beams to be fed back; in the case where the CSI includes multiple bitmaps , each bitmap maps a CSI-RS frequency-compressed coefficient of a beam to be fed back.
  • the network-side device can configure the terminal to feed back a bitmap (bitmap) corresponding to multiple CSI-RSs; or, the network-side device can configure the terminal to feed back a bitmap (bitmap) corresponding to each CSI-RS. Multiple bitmaps.
  • the network side device does not configure the number of bitmaps to be fed back, one bitmap is fed back to the terminal by default.
  • the transmission rank (rank) included in the CSI is greater than 1, it indicates that the CSI-RS corresponds to at least two transmission layers, and the bitmap corresponding to each transmission layer can be separately fed back in the CSI, or can be fed back according to After certain rules are cascaded, they are fed back in CSI.
  • the method also includes:
  • the network side device determines the mapping relationship between the bitmap in the CSI and the frequency domain compressed coefficients of the CSI-RS to be fed back according to the pre-agreed mapping rule.
  • mapping rules include at least one of the following:
  • Rule 1 according to the priority order of CSI-RS, map to the bitmap; wherein, the priority of CSI-RS can be determined by signal strength (such as RSRP);
  • Rule 4 according to the order of the identification size of the coefficients of the CSI-RS feedback beams compressed in the frequency domain, map them to the bitmap;
  • Rule 6 Map to the bitmap according to the priority order of the transmission layer corresponding to the CSI-RS.
  • the priority among the above-mentioned rules 1-6 can also be determined by network configuration or pre-agreement. If it needs to be discarded (such as insufficient resources or resource conflicts, etc.), then the latter mapping will be discarded first. However, it needs to be ensured that the terminal and the network side device have the same understanding of each rule and the priority of each rule.
  • the mapping rule is rule 2 first, then rule 3, and then rule 4.
  • the corresponding relationship of each bit in the bitmap may be: the first coefficient of the first beam of the first CSI-RS, the second coefficient of the first beam of the first CSI-RS, ..., the first coefficient of the second beam of the first CSI-RS, the second coefficient of the second beam of the first CSI-RS, ..., the first of the second CSI-RS The first coefficient of the beam, the second coefficient of the first beam of the second CSI-RS, ..., the first coefficient of the second beam of the second CSI-RS, the second CSI-RS The second coefficient of the first beam of , ... .
  • the mapping rule is rule 4 first and rule 3 second.
  • the corresponding relationship of each bit in the bitmap may be: the first coefficient of the first beam of the first CSI-RS, the first coefficient of the second beam of the first CSI-RS, ..., the second coefficient of the first beam of the second CSI-RS, the second coefficient of the second beam of the second CSI-RS, ....
  • the mapping rule is priority rule 5, then rule 2, then rule 3, and then rule 4.
  • the terminal reports a CSI after measuring multiple CSI-RS, and the CSI carries the bit corresponding to the CSI-RS determined by the terminal according to the network configuration or the pre-agreed mapping rule
  • the network-side device can determine the mapping relationship between the bitmap in the CSI and the frequency-domain compressed coefficient of the CSI-RS to be fed back according to the corresponding mapping rules, so that the terminal and the network-side device can compare the bitmap
  • the understanding of the graph is consistent, and the correct transmission efficiency of CSI is improved.
  • the multipoint transmission system includes 8 transmission points (Transmission/Reception Point, TRP), which are TRP1, TRP2, TRP3, TRP4, TRP5, TRP6, TRP7, and TRP8.
  • TRP Transmission/Reception Point
  • each CSI-RS pilot configured by the base station is the same, and 4 CSI-RSs are configured.
  • first coefficient second coefficient third coefficient fourth coefficient 1 1 0 1 0 2 0 1 1 0 3 1 1 1 1 4 1 0 0 1 5 0 1 0 1 6 0 1 0 1 7 1 0 1 0 8 0 1 1 1
  • beam indexes 1 and 2 correspond to the first CSI-RS
  • beam indexes 3 and 4 correspond to the second CSI-RS
  • beam indexes 5 and 6 correspond to the third CSI-RS
  • beam indexes 7 and 8 correspond to the fourth CSI-RS.
  • bitmap included in the CSI is: 1010 0110 1111 1001 0101 0101 1010 0111, or the bitmap included in the CSI is: 10110010 01101101 11100011 00111101.
  • first coefficient second coefficient third coefficient fourth coefficient 1 1 0 1 0 2 0 1 1 0 3 1 1 1 1 4 1 0 0 1 5 0 0 0 0 6 0 0 0 0 7 1 0 1 0 8 0 1 1 1
  • beam indexes 1 and 2 correspond to the first CSI-RS
  • beam indexes 3 and 4 correspond to the second CSI-RS
  • beam indexes 5 and 6 correspond to the third CSI-RS
  • beam indexes 7 and 8 correspond to the fourth CSI-RS.
  • all coefficients corresponding to beams 5 and 6 are 0, which means that the third CSI-RS is not selected in the CSI fed back by the terminal.
  • bitmap included in the CSI is: 1010 0110 1111 1001 0000 0000 1010 0111; or the bitmap included in the CSI: 10110010 01100001 11100011 00110001.
  • bitmap corresponding to the first CSI-RS is: 10100110, or 10011100.
  • bitmap corresponding to the second CSI-RS is: 1010011011111001, or 1011011011100011.
  • bitmap corresponding to the third CSI-RS is: 10100101, or, 10011001.
  • bitmap corresponding to the fourth CSI-RS is: 01111101, or 01111011.
  • the CSI feedback method provided in the embodiment of the present application may be executed by a CSI feedback device.
  • the CSI feedback device provided in the embodiment of the present application is described by taking the CSI feedback device executing the CSI feedback method as an example.
  • the embodiment of the present application also provides a channel state information CSI feedback device 500, including:
  • the first determination module 501 is configured to determine N channel state information reference signals CSI-RS to be measured; N is an integer greater than 1;
  • the second determining module 502 is configured to measure the N CSI-RSs to obtain CSI; wherein, the CSI includes: transmission rank, beam indexes corresponding to the P CSI-RSs, and P CSI-RSs corresponding to A bitmap, where the bitmap is used to indicate the frequency-domain compressed coefficient of the CSI-RS feedback beam; P is an integer less than or equal to N;
  • the sending module 503 is configured to send the CSI to the network side device.
  • the first determination module includes:
  • the first receiving submodule is configured to receive N CSI-RS configured by the network side device;
  • the second receiving submodule is configured to receive M CSI-RSs configured by the network side device, and receive activation signaling; the activation signaling is used to activate N CSI-RSs among the M CSI-RSs; wherein , M is an integer greater than N.
  • the device also includes:
  • the first configuration receiving module is configured to receive the total number of beams that need to be fed back by the N CSI-RS configured by the network side device, and determine the number of beams that each CSI-RS needs to feed back respectively according to the total number of beams; or, the terminal receives the network side The number of beams that need to be fed back by each CSI-RS configured by the device;
  • the third determining module is configured to determine beam indexes corresponding to the P CSI-RS respectively according to the number of beams to be fed back by each CSI-RS.
  • the device also includes:
  • the second configuration receiving module is used to receive one or more values of the sub-band precoding matrix indication PMI configured by the network side device;
  • the fourth determination module is used to perform frequency-domain compression on the precoding matrices corresponding to the P CSI-RS according to one or more values of the sub-band PMI, and determine the feedback beams of the P CSI-RS after frequency-domain compression coefficient.
  • the bitmap corresponding to the P CSI-RSs includes: a bitmap, and the bitmap maps the frequency-domain compressed coefficients of the P CSI-RSs to be fed back;
  • the bitmaps corresponding to the P CSI-RSs include: a plurality of bitmaps, each bitmap maps a frequency-domain compressed coefficient of a CSI-RS to be fed back to a beam;
  • the bitmap corresponding to the P CSI-RSs is determined by the terminal according to network configuration or pre-agreement.
  • the CSI when P is less than N, the CSI further includes: identification information of the P CSI-RSs.
  • the device also includes:
  • the first mapping module is configured to map the frequency-domain compressed coefficients of P CSI-RS beams to be fed back to a bitmap according to network configuration or a pre-agreed mapping rule;
  • the second mapping module is configured to map the frequency-domain compressed coefficients of each CSI-RS beam to be fed back to corresponding bitmaps according to network configuration or pre-agreed mapping rules.
  • mapping rule includes at least one of the following:
  • the identification size order of the frequency-domain compressed coefficients of the CSI-RS feedback beams are mapped to the bitmap
  • the terminal reports a CSI after measuring multiple CSI-RS, and the CSI carries the bitmap corresponding to the CSI-RS determined by the terminal according to the network configuration or the pre-agreed mapping rule , the network-side device can determine the mapping relationship between the bitmap in the CSI and the frequency-domain compressed coefficient of the CSI-RS to be fed back according to the corresponding mapping rules, so that the terminal and the network-side device can compare the bitmap
  • the understanding is consistent, and the correct transmission efficiency of CSI is improved.
  • the channel state information CSI feedback device provided in the embodiment of the present application is a device capable of executing the above channel state information CSI feedback method, and all embodiments of the above channel state information CSI feedback method are applicable to this device, and all Can achieve the same or similar beneficial effects.
  • the embodiment of the present application also provides a channel state information CSI feedback device 600, including:
  • the receiving module 601 is configured to receive CSI fed back by the terminal after measuring N CSI-RSs, where the CSI includes: transmission rank, beam indexes corresponding to P CSI-RSs, and bitmaps corresponding to P CSI-RSs , the bitmap is used to indicate the frequency-domain compressed coefficient of the CSI-RS beam to be fed back; N is an integer greater than 1; P is an integer less than or equal to N.
  • the device also includes:
  • a first configuration module configured to configure N CSI-RSs for the terminal
  • the activation signaling is used to indicate the activation of N CSI-RSs in the M CSI-RSs; where M is greater than Integer of N.
  • the device also includes:
  • the second configuration module is used to configure the total number of beams to be fed back by N CSI-RSs for the terminal;
  • the device also includes:
  • the third configuration module is configured to configure one or more values of the subband precoding matrix indication PMI for the terminal.
  • the device also includes:
  • a fourth configuration module configured for the terminal to configure the CSI fed back by the terminal to include one bitmap or multiple bitmaps
  • the bitmap maps the frequency-domain compressed coefficients of P CSI-RS beams to be fed back; in the case where the CSI includes multiple bitmaps , each bitmap maps a CSI-RS frequency-compressed coefficient of a beam to be fed back.
  • the CSI when P is less than N, the CSI further includes: identification information of the P CSI-RSs.
  • the device also includes:
  • the tenth determination module is configured to determine, according to a pre-agreed mapping rule, the mapping relationship between the bitmap in the CSI and the frequency domain compressed coefficients of the CSI-RS beams to be fed back.
  • mapping rule includes at least one of the following:
  • the identification size order of the frequency-domain compressed coefficients of the CSI-RS feedback beams are mapped to the bitmap
  • the terminal reports a CSI after measuring multiple CSI-RS, and the CSI carries the bitmap corresponding to the CSI-RS determined by the terminal according to the network configuration or the pre-agreed mapping rule , the network-side device can determine the mapping relationship between the bitmap in the CSI and the frequency-domain compressed coefficient of the CSI-RS to be fed back according to the corresponding mapping rules, so that the terminal and the network-side device can compare the bitmap
  • the understanding is consistent, and the correct transmission efficiency of CSI is improved.
  • the channel state information CSI feedback device provided in the embodiment of the present application is a device capable of executing the above channel state information CSI feedback method, and all embodiments of the above channel state information CSI feedback method are applicable to this device, and all Can achieve the same or similar beneficial effects.
  • the channel state information CSI feedback apparatus in this embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in the electronic device, such as an integrated circuit or a chip.
  • the electronic device may be a terminal, or other devices other than the terminal.
  • the terminal may include, but not limited to, the types of terminal 11 listed above, and other devices may be servers, Network Attached Storage (NAS), etc., which are not specifically limited in this embodiment of the present application.
  • NAS Network Attached Storage
  • the channel state information CSI feedback device provided by the embodiment of the present application can realize each process realized by the method embodiments in FIG. 1 to FIG. 4 and achieve the same technical effect. To avoid repetition, details are not repeated here.
  • this embodiment of the present application also provides a communication device 700, including a processor 701 and a memory 702, and the memory 702 stores programs or instructions that can run on the processor 701, for example , when the communication device 700 is a terminal, when the program or instruction is executed by the processor 701, each step of the above embodiment of the channel state information CSI feedback method is implemented, and the same technical effect can be achieved.
  • the communication device 700 is a network-side device, when the program or instruction is executed by the processor 701, the various steps of the above-mentioned channel state information CSI feedback method embodiment can be achieved, and the same technical effect can be achieved. To avoid repetition, details are not repeated here. .
  • the embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the processor is used to determine N channel state information reference signals CSI-RS to be measured; N is an integer greater than 1; measure the N CSI-RS to obtain CSI; wherein, the CSI includes: transmission rank, beam index corresponding to P CSI-RS respectively, and bitmap corresponding to P CSI-RS, the bitmap is used to indicate The CSI-RS needs to feed back the coefficient of the frequency domain compressed beam; P is an integer less than or equal to N; the communication interface is used to send the CSI to the network side device.
  • the processor is used to determine N channel state information reference signals CSI-RS to be measured
  • N is an integer greater than 1
  • the CSI includes: transmission rank, beam index corresponding to P CSI-RS respectively, and bitmap corresponding to P CSI-RS, the bitmap is used to indicate
  • the CSI-RS needs to feed back the coefficient of the frequency domain compressed beam
  • FIG. 8 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.
  • the terminal 800 includes but not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit 807, an interface unit 808, a memory 809, and a processor 810, etc. At least some parts.
  • the terminal 800 may also include a power supply (such as a battery) for supplying power to various components, and the power supply may be logically connected to the processor 810 through the power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions.
  • the terminal structure shown in FIG. 8 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine some components, or arrange different components, which will not be repeated here.
  • the input unit 804 may include a graphics processing unit (Graphics Processing Unit, GPU) 8041 and a microphone 8042, and the graphics processor 8041 is used in a video capture mode or an image capture mode by an image capture device (such as the image data of the still picture or video obtained by the camera) for processing.
  • the display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like.
  • the user input unit 807 includes at least one of a touch panel 8071 and other input devices 8072 .
  • the touch panel 8071 is also called a touch screen.
  • the touch panel 8071 may include two parts, a touch detection device and a touch controller.
  • Other input devices 8072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, and joysticks, which will not be repeated here.
  • the radio frequency unit 801 may transmit the downlink data from the network side device to the processor 810 for processing after receiving the downlink data; in addition, the radio frequency unit 801 may send uplink data to the network side device.
  • the radio frequency unit 801 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.
  • the memory 809 can be used to store software programs or instructions as well as various data.
  • the memory 809 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 instructions required by at least one function (such as a sound playing function, image playback function, etc.), etc.
  • memory 809 may include volatile memory or nonvolatile memory, or, memory 809 may include both volatile and nonvolatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically programmable Erase Programmable Read-Only Memory (Electrically EPROM, EEPROM) or Flash.
  • ROM Read-Only Memory
  • PROM programmable read-only memory
  • Erasable PROM Erasable PROM
  • EPROM erasable programmable read-only memory
  • Electrical EPROM Electrical EPROM
  • EEPROM electronically programmable Erase Programmable Read-Only Memory
  • Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synch link DRAM , SLDRAM) and Direct Memory Bus Random Access Memory (Direct Rambus RAM, DRRAM).
  • RAM Random Access Memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • Double Data Rate SDRAM Double Data Rate SDRAM
  • DDRSDRAM double data rate synchronous dynamic random access memory
  • Enhanced SDRAM, ESDRAM enhanced synchronous dynamic random access memory
  • Synch link DRAM , SLDRAM
  • Direct Memory Bus Random Access Memory Direct Rambus
  • the processor 810 may include one or more processing units; optionally, the processor 810 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to the operating system, user interface, and application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the foregoing modem processor may not be integrated into the processor 810 .
  • the processor 810 is configured to determine N channel state information reference signals CSI-RS to be measured; N is an integer greater than 1; measure the N CSI-RS to obtain CSI; wherein the CSI includes: transmission rank, the beam indexes corresponding to the P CSI-RSs, and the bitmap corresponding to the P CSI-RSs, the bitmap is used to indicate the frequency domain compressed coefficients of the feedback beams of the CSI-RSs; P is an integer less than or equal to N;
  • the radio frequency unit 801 is configured to send the CSI to the network side device.
  • the terminal reports a CSI after measuring multiple CSI-RS, and the CSI carries the bitmap corresponding to the CSI-RS determined by the terminal according to the network configuration or the pre-agreed mapping rule , the network-side device can determine the mapping relationship between the bitmap in the CSI and the frequency-domain compressed coefficient of the CSI-RS to be fed back according to the corresponding mapping rules, so that the terminal and the network-side device can compare the bitmap
  • the understanding is consistent, and the correct transmission efficiency of CSI is improved.
  • the terminal provided by the embodiment of the present application is a terminal capable of performing the above-mentioned channel state information CSI feedback method, and all embodiments of the above-mentioned channel state information CSI feedback method are applicable to this terminal, and can achieve the same or similar beneficial effect.
  • the embodiment of the present application also provides a network side device, including a processor and a communication interface, wherein the communication interface is used to receive the CSI fed back by the terminal after measuring N CSI-RSs, and the CSI includes: transmission rank, P The beam indexes corresponding to the CSI-RSs, and the bitmaps corresponding to the P CSI-RSs, the bitmaps are used to indicate the frequency domain compressed coefficients of the feedback beams of the CSI-RSs; N is greater than 1 Integer; P is an integer less than or equal to N.
  • the network-side device embodiment corresponds to the above-mentioned network-side device method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.
  • the embodiment of the present application also provides a network side device.
  • the network side device 900 includes: an antenna 91 , a radio frequency device 92 , a baseband device 93 , a processor 94 and a memory 95 .
  • the antenna 91 is connected to a radio frequency device 92 .
  • the radio frequency device 92 receives information through the antenna 91, and sends the received information to the baseband device 93 for processing.
  • the baseband device 93 processes the information to be sent and sends it to the radio frequency device 92
  • the radio frequency device 92 processes the received information and sends it out through the antenna 91 .
  • the method performed by the network side device in the above embodiments may be implemented in the baseband device 93, where the baseband device 93 includes a baseband processor.
  • the baseband device 93 can include at least one baseband board, for example, a plurality of chips are arranged on the baseband board, as shown in FIG.
  • the program executes the network device operations shown in the above method embodiments.
  • the network side device may also include a network interface 96, such as a common public radio interface (common public radio interface, CPRI).
  • a network interface 96 such as a common public radio interface (common public radio interface, CPRI).
  • the network side device 900 in this embodiment of the present invention further includes: instructions or programs stored in the memory 95 and executable on the processor 94, and the processor 94 invokes the instructions or programs in the memory 95 to execute the various programs shown in FIG.
  • the method of module execution achieves the same technical effect, so in order to avoid repetition, it is not repeated here.
  • the embodiment of the present application also provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, each process of the above-mentioned channel state information CSI feedback method embodiment is implemented, and The same technical effect can be achieved, so in order to avoid repetition, details will not be repeated here.
  • the processor is the processor in the terminal described in the foregoing embodiments.
  • 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, and the like.
  • the embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above channel state information CSI feedback method
  • the chip includes a processor and a communication interface
  • the communication interface is coupled to the processor
  • the processor is used to run programs or instructions to implement the above channel state information CSI feedback method
  • the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.
  • An embodiment of the present application further provides a computer program/program product, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement the above channel state information CSI feedback
  • Each process of the method embodiment can achieve the same technical effect, and will not be repeated here to avoid repetition.
  • the embodiment of the present application also provides a communication system, including: a terminal and a network side device, the terminal can be used to perform the steps of the channel state information CSI feedback method as described above, and the network side device can be used to perform the above steps The steps of the channel state information CSI feedback method.
  • the term “comprising”, “comprising” or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase “comprising a " does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.
  • the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
  • the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation.
  • the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic disk, etc.) , CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of the present application.

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Abstract

本申请公开了一种信道状态信息CSI反馈方法、装置、终端及网络侧设备，属于通信技术领域，本申请实施例的方法包括：终端确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；终端测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；终端向网络侧设备发送所述CSI。

Description

信道状态信息CSI反馈方法、装置、终端及网络侧设备
相关申请的交叉引用
本申请主张在2022年1月4日在中国提交的中国专利申请No.202210003206.4的优先权，其全部内容通过引用包含于此。
技术领域
本申请属于通信技术领域，具体涉及一种信道状态信息CSI反馈方法、装置、终端及网络侧设备。
背景技术
当前技术支持类型II信道状态信息(Type II Channel State Information，Type II CSI)，终端基于配置的信道状态信息参考信号(Channel State Information Reference Signal，CSI-RS)进行测量并根据相关配置反馈多个波束索引以及每个波束对应每个频域子带的幅度和相位信息反馈。
当前技术进一步支持演进的Type II CSI，在Type II CSI的基础上将预编码矩阵在频域进行压缩后进行反馈，所反馈的信息包含一个比特位图，该比特位图表示每个波束在频域进行压缩后对应的系数是0或1，0表示该系数对应的幅度和相位不反馈，1表示该系数对应的幅度和相位进行反馈。
当前技术中的CSI反馈方式仅适用于单点传输系统，在多点传输系统中如何配置信道测量导频以及终端如何反馈Type II CSI当前技术尚未支持。
发明内容
本申请实施例提供一种信道状态信息CSI反馈方法、装置、终端及网络侧设备，能够解决如何在多点传输系统中反馈CSI的问题。
第一方面，提供了一种信道状态信息CSI反馈方法，包括：
终端确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；
终端测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩， P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；
终端向网络侧设备发送所述CSI。
第二方面，提供了一种信道状态信息CSI反馈方法，包括：
网络侧设备接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N为大于1的整数；P为小于或者等于N的整数。
第三方面，提供了一种信道状态信息CSI反馈装置，包括：
第一确定模块，用于确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；
第二确定模块，用于测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；
发送模块，用于向网络侧设备发送所述CSI。
第四方面，提供了一种信道状态信息CSI反馈装置，包括：
接收模块，用于接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N为大于1的整数；P为小于或者等于N的整数。
第五方面，提供了一种终端，该终端包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如第一方面所述的方法的步骤。
第六方面，提供了一种终端，包括处理器及通信接口，其中，所述处理器用于确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用 于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；所述通信接口用于向网络侧设备发送所述CSI。
第七方面，提供了一种网络侧设备，该网络侧设备包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如第二方面所述的方法的步骤。
第八方面，提供了一种网络侧设备，包括处理器及通信接口，其中，所述通信接口用于接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N为大于1的整数；P为小于或者等于N的整数。
第九方面，提供了一种通信系统，包括：终端及网络侧设备，所述终端可用于执行如第一方面所述的信道状态信息CSI反馈方法的步骤，所述网络侧设备可用于执行如第二方面所述的信道状态信息CSI反馈方法的步骤。
第十方面，提供了一种可读存储介质，所述可读存储介质上存储程序或指令，所述程序或指令被处理器执行时实现如第一方面所述的方法的步骤，或者实现如第二方面所述的方法的步骤。
第十一方面，提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现如第一方面所述的方法，或实现如第二方面所述的方法。
第十二方面，提供了一种计算机程序/程序产品，所述计算机程序/程序产品被存储在存储介质中，所述计算机程序/程序产品被至少一个处理器执行以实现如第一方面所述的方法的步骤，或实现如第二方面所述的方法的步骤。
在本申请实施例中，在多点传输系统中，终端对多个CSI-RS测量后向上报一个CSI，该CSI携带终端按照网络配置或预先约定的映射规则确定的CSI-RS对应的比特位图，网络侧设备能够依据对应的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系，从而实现终端和网络侧设备对比特位图的理解一致，提升CSI的正确传输效率。
附图说明
图1表示本申请实施例可应用的一种无线通信系统的框图；
图2表示本申请实施例提供的信道状态信息CSI反馈方法的步骤流程图之一；
图3表示本申请实施例提供的信道状态信息CSI反馈方法的步骤流程图之二；
图4表示本申请实施例提供的示例一的多点传输系统示例图；
图5表示本申请实施例提供的信道状态信息CSI反馈装置的结构示意图之一；
图6表示本申请实施例提供的信道状态信息CSI反馈装置的结构示意图之二；
图7表示本申请实施例提供的通信设备的结构示意图；
图8表示本申请实施例提供的终端的结构示意图；
图9表示本申请实施例提供的网络侧设备的结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施，且“第一”、“第二”所区别的对象通常为一类，并不限定对象的个数，例如第一对象可以是一个，也可以是多个。此外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”一般表示前后关联对象是一种“或”的关系。
值得指出的是，本申请实施例所描述的技术不限于长期演进型(Long Term Evolution，LTE)/LTE的演进(LTE-Advanced，LTE-A)系统，还可用 于其他无线通信系统，诸如码分多址(Code Division Multiple Access，CDMA)、时分多址(Time Division Multiple Access，TDMA)、频分多址(Frequency Division Multiple Access，FDMA)、正交频分多址(Orthogonal Frequency Division Multiple Access，OFDMA)、单载波频分多址(Single-carrier Frequency Division Multiple Access，SC-FDMA)和其他系统。本申请实施例中的术语“系统”和“网络”常被可互换地使用，所描述的技术既可用于以上提及的系统和无线电技术，也可用于其他系统和无线电技术。以下描述出于示例目的描述了新空口(New Radio，NR)系统，并且在以下大部分描述中使用NR术语，但是这些技术也可应用于NR系统应用以外的应用，如第6代(6 th Generation，6G)通信系统。
图1示出本申请实施例可应用的一种无线通信系统的框图。无线通信系统包括终端11和网络侧设备12。其中，终端11可以是手机、平板电脑(Tablet Personal Computer)、膝上型电脑(Laptop Computer)或称为笔记本电脑、个人数字助理(Personal Digital Assistant，PDA)、掌上电脑、上网本、超级移动个人计算机(ultra-mobile personal computer，UMPC)、移动上网装置(Mobile Internet Device，MID)、增强现实(augmented reality，AR)/虚拟现实(virtual reality，VR)设备、机器人、可穿戴式设备(Wearable Device)、车载设备(Vehicle User Equipment，VUE)、行人终端(Pedestrian User Equipment，PUE)、智能家居(具有无线通信功能的家居设备，如冰箱、电视、洗衣机或者家具等)、游戏机、个人计算机(personal computer，PC)、柜员机或者自助机等终端侧设备，可穿戴式设备包括：智能手表、智能手环、智能耳机、智能眼镜、智能首饰(智能手镯、智能手链、智能戒指、智能项链、智能脚镯、智能脚链等)、智能腕带、智能服装等。需要说明的是，在本申请实施例并不限定终端11的具体类型。网络侧设备12可以包括接入网设备或核心网设备，其中，接入网设备12也可以称为无线接入网设备、无线接入网(Radio Access Network,RAN)、无线接入网功能或无线接入网单元。接入网设备12可以包括基站、WLAN接入点或WiFi节点等，基站可被称为节点B、演进节点B(eNB)、接入点、基收发机站(Base Transceiver Station，BTS)、无线电基站、无线电收发机、基本服务集(Basic Service Set，BSS)、扩展服务集(Extended  Service Set，ESS)、家用B节点、家用演进型B节点、发送接收点(Transmitting Receiving Point，TRP)或所述领域中其他某个合适的术语，只要达到相同的技术效果，所述基站不限于特定技术词汇，需要说明的是，在本申请实施例中仅以NR系统中的基站为例进行介绍，并不限定基站的具体类型。
下面结合附图，通过一些实施例及其应用场景对本申请实施例提供的信道状态信息CSI反馈方法、装置、终端及网络侧设备进行详细地说明。
如图2所示，本申请实施例提供一种信道状态信息CSI反馈方法，包括：
步骤201，终端确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；
步骤202，终端测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩(rank)，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；
步骤203，终端向网络侧设备发送所述CSI。
本申请实施例中，每个CSI-RS的端口数目可以相同或者不同，且每个CSI-RS的端口数目为大于1的正整数。
在本申请的至少一个实施例中，上述CSI为演进的Type II CSI(可简称为eType II CSI)，即终端将CSI-RS的需反馈波束对应的预编码矩阵在频域上进行压缩后在CSI中反馈，即反馈的CSI中包括P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数为0或1，0表示该系数对应的幅度和相位不反馈，1表示该系数对应的幅度和相位进行反馈。
作为一个可选实施例，P可以等于N，即终端测量的N个CSI-RS均在CSI中反馈。
作为另一个可选实施例，P可以小于N，即终端灵活选择测量的N个CSI-RS中的部分CSI-RS在CSI中反馈。可选地，在P小于N的情况下，所述CSI还包括：所述P个CSI-RS的标识信息，例如P个CSI-RS的CSI-RS索引(CSI-RS index，CRI)。该CRI指示被终端选择的CSI-RS。该种方式也可以称为终端采用显式指示的方式指示其灵活选择的CSI-RS。
作为又一个可选实施例，终端还可以采用隐式指示的方式指示其灵活选择的CSI-RS，即P等于N，但在N个CSI-RS对应的比特位图中，将未被选择的CSI-RS对应的所有比特位均置为0。
在本申请的至少一个实施例中，步骤201包括：
终端接收网络侧设备配置的N个CSI-RS；即不需要网络侧进行激活操作，终端直接对配置的N个CSI-RS进行测量；
或者，步骤201包括：
终端接收网络侧设备配置的M个CSI-RS，并接收激活信令；所述激活信令用于激活所述M个CSI-RS中的N个CSI-RS；其中，M为大于N的整数。例如，该激活信令可以为MAC CE(Medium Access Control Control Element，媒体接入控制层控制单元)或DCI(Downlink Control Information，下行控制信息)。
在本申请实施例中，所述方法还包括：
终端接收网络侧设备配置的N个CSI-RS需反馈的波束总数量，根据所述波束总数量确定各个CSI-RS分别需反馈的波束数量；或者，终端接收网络侧设备配置的各个CSI-RS分别需反馈的波束数量；
所述终端根据各个CSI-RS分别需反馈的波束数量，确定所述P个CSI-RS分别对应的波束索引。
换言之，网络侧设备进一步配置终端所需要反馈的波束(基向量)数量，可以配置总数量为L，或为N个CSI-RS分别进行配置波束数量，如L 1，L 2，……，L N。当波束数量配置为总数量L的情况下，终端根据预定义规则把波束总数量L分别对应到N个CSI-RS。
例如，如果N个CSI-RS的端口数相同时，每个CSI-RS对应的波束数量相同(L被N整除)或最后一个CSI-RS对应的波束数量与其他CSI-RS不同(L不能被N整除)。再例如，如果N个CSI-RS的端口数不同时，按照各个CSI-RS端口数确定对应的波束数量，比如CSI-RS 1的端口数为4，CSI-RS 2的端口数为8，那么CSI-RS 2对应的波束数量是CSI-RS 1对应的波束数量的2倍。
在本申请的至少一个实施例中，所述方法还包括：
终端接收网络侧设备配置的子带预编码矩阵指示(Precoding Matrix Indicator，PMI)的一个或多个取值；
所述终端根据子带PMI的一个或多个取值对P个CSI-RS分别对应的预编码矩阵进行频域压缩，确定P个CSI-RS的需反馈波束经频域压缩后的系数。
需要说明的是，在网络侧设备配置了子带PMI的一个取值的情况下，N个CSI-RS可以共用该取值；或者，在网络侧设备配置了子带PMI的多个取值的情况下，每个CSI-RS分别对应一个取值；可选的，至少两个CSI-RS对应不同的子带PMI的取值。
可选地，当波束数量配置为总数量L时，网络侧设备仅配置子带PMI的一个值；当N个CSI-RS分别配置波束数量时，网络侧设备可以配置一个子带PMI的共用值或分别配置子带PMI的N个值(即一个CSI-RS对应PMI的一个取值)。
在本申请的至少一个实施例中，所述方法还包括：
所述P个CSI-RS对应的比特位图包括：一个比特位图，所述比特位图映射P个CSI-RS的需反馈波束经频域压缩后的系数；
或者，所述P个CSI-RS对应的比特位图包括：多个比特位图，每个比特位图映射一个CSI-RS的需反馈波束经频域压缩后的系数；
其中，所述P个CSI-RS对应的比特位图为所述终端根据网络配置或预先约定确定的。
例如，网络侧设备可以配置终端反馈多个CSI-RS对应的一个比特位图(bitmap)；或，网络侧设备配置终端反馈每个CSI-RS对应的比特位图(bitmap)，即配置终端反馈多个比特位图。可选地，如果网络侧设备不配置反馈的比特位图的数量，则默认为终端反馈一个比特位图。
再例如，“预先约定”可以理解为终端和网络侧设备通过信令交互的方式预先确定P个CSI-RS对应的比特位图包括：一个比特位图或多个比特位图；也可以理解为通过协议约定规定P个CSI-RS对应的比特位图包括：一个比特位图或多个比特位图；即确定终端反馈多个CSI-RS对应的一个比特位图(bitmap)；或，确定终端反馈每个CSI-RS对应的比特位图(bitmap)，即确定终端反馈多个比特位图。
进一步的，在本申请的至少一个实施例中，所述方法还包括：
在网络侧设备配置终端反馈多个CSI-RS对应的一个比特位图或网络侧不配置的情况下，终端根据网络配置或预先约定的映射规则，将P个CSI-RS的需反馈波束经频域压缩后的系数映射到一个比特位图上。
例如，P＝4，分别为第一CSI-RS，第二CSI-RS，第三CSI-RS，第四CSI-RS；则终端将第一CSI-RS，第二CSI-RS，第三CSI-RS以及第四CSI-RS的所有需反馈波束经频域压缩后的系数均映射到一个比特位图上，得到1个比特位图。
或者，在本申请的至少一个实施例中，所述方法还包括：
在网络侧设备配置终端反馈每个CSI-RS对应的比特位图的情况下，终端根据网络配置或预先约定的映射规则，将每个CSI-RS的需反馈波束经频域压缩后的系数分别映射到对应的比特位图上。
例如，P＝4，分别为第一CSI-RS，第二CSI-RS，第三CSI-RS，第四CSI-RS；则终端将第一CSI-RS的需反馈波束经频域压缩后的系数映射到一个比特位图上，终端将第二CSI-RS的需反馈波束经频域压缩后的系数映射到一个比特位图上，终端将第三CSI-RS的需反馈波束经频域压缩后的系数映射到一个比特位图上，终端将第四CSI-RS的需反馈波束经频域压缩后的系数均映射到一个比特位图上，得到4个比特位图。
需要说明的是，若CSI中包括的传输秩(rank)大于1，则表明CSI-RS对应至少两个传输层，则每个传输层对应的比特位图可以在CSI中分别反馈，也可以按照一定规则级联后在CSI中反馈。
在本申请的至少一个实施例中，所述映射规则包括下述至少一项：
规则1，按照CSI-RS的优先级高低顺序，映射到比特位图上；其中，CSI-RS的优先级可通过信号强度(如参考信号接收功率(Reference Signal ReceivedPower，RSRP))确定；
规则2，按照CSI-RS的索引大小顺序，映射到比特位图上；
规则3，按照CSI-RS对应的波束索引大小顺序，映射到比特位图上；
规则4，按照CSI-RS的需反馈波束经频域压缩后的系数的标识大小顺序，映射到比特位图上；
规则5，按照CSI-RS对应的传输层标识大小顺序，映射到比特位图上；
规则6，按照CSI-RS对应的传输层优先级高低顺序，映射到比特位图上。
上述规则1-规则6之间的优先级也可以由网络配置或者预先约定确定，如果需要丢弃(如资源不足或资源冲突等情况)，那么后映射的先丢弃。但需要确保终端和网络侧设备对各个规则以及各个规则的优先级的理解一致。
例如，当所反馈的秩(rank)为1时，每个CSI-RS对应的波束数目大于1的情况下，映射规则为，优先规则2，再规则3，再规则4。具体的，比特位图的各个比特位依次对应关系可以为：第一个CSI-RS的第一个波束的第一个系数、第一个CSI-RS的第一个波束的第二个系数、……、第一个CSI-RS的第二个波束的第一个系数、第一个CSI-RS的第二个波束的第二个系数、……、第二个CSI-RS的第一个波束的第一个系数、第二个CSI-RS的第一个波束的第二个系数、……、第二个CSI-RS的第二个波束的第一个系数、第二个CSI-RS的第一个波束的第二个系数、……。
再例如，当所反馈的秩(rank)为1时，每个CSI-RS对应的波束数目大于1的情况下，映射规则为，优先规则4，再规则3。具体的，比特位图的各个比特位依次对应关系可以为：第一个CSI-RS的第一个波束的第一个系数、第一个CSI-RS的第二个波束的第一个系数、……、第二个CSI-RS的第一个波束的第二个系数、第二个CSI-RS的第二个波束的第二个系数、……。
再例如，当所反馈的秩(rank)大于1时，每个CSI-RS对应的波束数目大于1的情况下，映射规则为，优先规则5，再规则2，再规则3，再规则4。具体的，比特位图的各个比特位依次对应关系可以为：第一个CSI-RS的第一个波束的第一层对应的第一个系数、第一个CSI-RS的第一个波束的第一层对应的第二个系数、……、第一个CSI-RS的第二个波束的第一层对应的第一个系数、第一个CSI-RS的第二个波束的第一层对应的第二个系数、……、第二个CSI-RS的第一个波束的第一层对应的第一个系数、第二个CSI-RS的第一个波束的第一层对应的第二个系数、……、第二个CSI-RS的第二个波束的第一层对应的第一个系数、第二个CSI-RS的第一个波束的第一层对应的第二个系数、……、第一个CSI-RS的第一个波束的第二层对应的第一个系数、第一个CSI-RS的第一个波束的第二层对应的第二个系数、……、第一个CSI-RS 的第二个波束的第二层对应的第一个系数、第一个CSI-RS的第二个波束的第二层对应的第二个系数、……、第二个CSI-RS的第一个波束的第二层对应的第一个系数、第二个CSI-RS的第一个波束的第二层对应的第二个系数、……、第二个CSI-RS的第二个波束的第二层对应的第一个系数、第二个CSI-RS的第一个波束的第二层对应的第二个系数、……。
在本申请实施例中，在多点传输系统中，终端对多个CSI-RS测量后向上报一个CSI，该CSI携带终端按照网络配置或预先约定的映射规则确定的CSI-RS对应的比特位图，网络侧设备能够依据对应的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系，从而实现终端和网络侧设备对比特位图的理解一致，提升CSI的正确传输效率。
如图3所示，本申请实施例还提供一种信道状态信息CSI反馈方法，包括：
步骤301，网络侧设备接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N为大于1的整数；P为小于或者等于N的整数。
本申请实施例中，每个CSI-RS的端口数目可以相同或者不同，且每个CSI-RS的端口数目为大于1的正整数。
在本申请的至少一个实施例中，上述CSI为演进的Type II CSI(可简称为eType II CSI)，即终端将CSI-RS的需反馈波束对应的预编码矩阵在频域上进行压缩后在CSI中反馈，即反馈的CSI中包括P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数为0或1，0表示该系数对应的幅度和相位不反馈，1表示该系数对应的幅度和相位进行反馈。
作为一个可选实施例，P可以等于N，即终端测量的N个CSI-RS均在CSI中反馈。
作为另一个可选实施例，P可以小于N，即终端灵活选择测量的N个CSI-RS中的部分CSI-RS在CSI中反馈。可选地，在P小于N的情况下，所 述CSI还包括：所述P个CSI-RS的标识信息，例如P个CSI-RS的CSI-RS索引(CSI-RS index，CRI)。该CRI指示被终端选择的CSI-RS。该种方式也可以称为终端采用显式指示的方式指示其灵活选择的CSI-RS。
作为又一个可选实施例，终端还可以采用隐式指示的方式指示其灵活选择的CSI-RS，即P等于N，但在N个CSI-RS对应的比特位图中，将未被选择的CSI-RS对应的所有比特位均置为0。
在本申请的至少一个实施例中，所述方法还包括：
网络侧设备为终端配置N个CSI-RS；即不需要网络侧进行激活操作，终端直接对配置的N个CSI-RS进行测量；
或者，
网络侧设备为终端配置M个CSI-RS，并向终端发送激活信令；所述激活信令用于指示激活所述M个CSI-RS中的N个CSI-RS；其中，M为大于N的整数。例如，该激活信令可以为MAC CE(Medium Access Control Control Element，媒体接入控制层控制单元)或DCI(Downlink Control Information，下行控制信息)。
在本申请实施例中，所述方法还包括：
网络侧设备为终端配置N个CSI-RS需反馈的波束总数量；
或者，
网络侧设备为终端配置各个CSI-RS分别需反馈的波束数量。
换言之，网络侧设备进一步配置终端所需要反馈的波束(基向量)数量，可以配置总数量为L，或为N个CSI-RS分别进行配置波束数量，如L 1，L 2，……，L N。当波束数量配置为总数量L的情况下，终端根据预定义规则把波束总数量L分别对应到N个CSI-RS。
例如，如果N个CSI-RS的端口数相同时，每个CSI-RS对应的波束数量相同(L被N整除)或最后一个CSI-RS对应的波束数量与其他CSI0RS不同(L不能被N整除)。再例如，如果N个CSI-RS的端口数不同时，按照各个CSI-RS端口数确定对应的波束数量，比如CSI-RS 1的端口数为4，CSI-RS 2的端口数为8，那么CSI-RS 2对应的波束数量是CSI-RS 1对应的波束数量的2倍。
在本申请的至少一个实施例中，所述方法还包括：
网络侧设备为终端配置子带预编码矩阵指示PMI的一个或多个取值。
需要说明的是，在网络侧设备配置了子带PMI的一个取值的情况下，N个CSI-RS可以共用该取值；或者，在网络侧设备配置了子带PMI的多个取值的情况下，每个CSI-RS分别对应一个取值；可选的，不同CSI-RS对应不同的子带PMI的取值。
可选地，当波束数量配置为总数量L时，网络侧设备仅配置子带PMI的一个值；当N个CSI-RS分别配置波束数量时，网络侧设备可以配置一个子带PMI的共用值或分别配置子带PMI的N个值(即一个CSI-RS对应PMI的一个取值)。
在本申请的至少一个实施例中，所述方法还包括：
网络侧设备为终端配置所述终端反馈的CSI包括一个比特位图或多个比特位图；
其中，在所述CSI包括一个比特位图的情况下，该比特位图映射P个CSI-RS的需反馈波束经频域压缩后的系数；在所述CSI包括多个比特位图的情况下，每个比特位图映射一个CSI-RS的需反馈波束经频域压缩后的系数。
例如，网络侧设备可以配置终端反馈多个CSI-RS对应的一个比特位图(bitmap)；或，网络侧设备配置终端反馈每个CSI-RS对应的比特位图(bitmap)，即配置终端反馈多个比特位图。可选地，如果网络侧设备不配置反馈的比特位图的数量，则默认为终端反馈一个比特位图。
需要说明的是，若CSI中包括的传输秩(rank)大于1，则表明CSI-RS对应至少两个传输层，则每个传输层对应的比特位图可以在CSI中分别反馈，也可以按照一定规则级联后在CSI中反馈。
进一步的，在本申请的至少一个实施例中，所述方法还包括：
网络侧设备根据预先约定的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系。
其中，所述映射规则包括下述至少一项：
规则1，按照CSI-RS的优先级高低顺序，映射到比特位图上；其中，CSI-RS的优先级可通过信号强度(如RSRP)确定；
规则2，按照CSI-RS的索引大小顺序，映射到比特位图上；
规则3，按照CSI-RS对应的波束索引大小顺序，映射到比特位图上；
规则4，按照CSI-RS的需反馈波束经频域压缩后的系数的标识大小顺序，映射到比特位图上；
规则5，按照CSI-RS对应的传输层标识大小顺序，映射到比特位图上；
规则6，按照CSI-RS对应的传输层优先级高低顺序，映射到比特位图上。
上述规则1-规则6之间的优先级也可以由网络配置或者预先约定确定，如果需要丢弃(如资源不足或资源冲突等情况)，那么后映射的先丢弃。但需要确保终端和网络侧设备对各个规则以及各个规则的优先级的理解一致。
例如，当所反馈的秩(rank)为1时，每个CSI-RS对应的波束数目大于1的情况下，映射规则为，优先规则2，再规则3，再规则4。具体的，比特位图的各个比特位依次对应关系可以为：第一个CSI-RS的第一个波束的第一个系数、第一个CSI-RS的第一个波束的第二个系数、……、第一个CSI-RS的第二个波束的第一个系数、第一个CSI-RS的第二个波束的第二个系数、……、第二个CSI-RS的第一个波束的第一个系数、第二个CSI-RS的第一个波束的第二个系数、……、第二个CSI-RS的第二个波束的第一个系数、第二个CSI-RS的第一个波束的第二个系数、……。
再例如，当所反馈的秩(rank)为1时，每个CSI-RS对应的波束数目大于1的情况下，映射规则为，优先规则4，再规则3。具体的，比特位图的各个比特位依次对应关系可以为：第一个CSI-RS的第一个波束的第一个系数、第一个CSI-RS的第二个波束的第一个系数、……、第二个CSI-RS的第一个波束的第二个系数、第二个CSI-RS的第二个波束的第二个系数、……。
再例如，当所反馈的秩(rank)大于1时，每个CSI-RS对应的波束数目大于1的情况下，映射规则为，优先规则5，再规则2，再规则3，再规则4。具体的，比特位图的各个比特位依次对应关系可以为：第一个CSI-RS的第一个波束的第一层对应的第一个系数、第一个CSI-RS的第一个波束的第一层对应的第二个系数、……、第一个CSI-RS的第二个波束的第一层对应的第一个系数、第一个CSI-RS的第二个波束的第一层对应的第二个系数、……、第二个CSI-RS的第一个波束的第一层对应的第一个系数、第二个CSI-RS的第一 个波束的第一层对应的第二个系数、……、第二个CSI-RS的第二个波束的第一层对应的第一个系数、第二个CSI-RS的第一个波束的第一层对应的第二个系数、……、第一个CSI-RS的第一个波束的第二层对应的第一个系数、第一个CSI-RS的第一个波束的第二层对应的第二个系数、……、第一个CSI-RS的第二个波束的第二层对应的第一个系数、第一个CSI-RS的第二个波束的第二层对应的第二个系数、……、第二个CSI-RS的第一个波束的第二层对应的第一个系数、第二个CSI-RS的第一个波束的第二层对应的第二个系数、……、第二个CSI-RS的第二个波束的第二层对应的第一个系数、第二个CSI-RS的第一个波束的第二层对应的第二个系数、……。
在本申请实施例中，在多点传输系统中，终端对多个CSI-RS测量后向上报一个CSI，该CSI携带终端按照网络配置或预先约定的映射规则确定的CSI-RS对应的比特位图，网络侧设备能够依据对应的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系，从而实现终端和网络侧设备对比特位图的理解一致，提升CSI的正确传输效率。
为了更清楚的描述本申请实施例提供的CSI反馈方法，下面结合几个示例进行说明。
示例一
如图4所示，多点传输系统包括8个传输点(Transmission/Reception Point，TRP)，分别为TRP1、TRP2、TRP3、TRP4、TRP5、TRP6、TRP7、TRP8。
基站为UE 1可以配置M＝8个CSI-RS导频(CSI-RS1，CSI-RS2，CSI-RS3，CSI-RS4，CSI-RS5，CSI-RS6，CSI-RS7，CSI-RS8)，进一步可以激活N＝4个CSI-RS。
基站为UE 2可以配置M＝4个CSI-RS导频(CSI-RS3，CSI-RS4，CSI-RS5，CSI-RS6)，进一步可以激活N＝4个CSI-RS。
基站为UE 3可以配置M＝2个CSI-RS导频(CSI-RS7，CSI-RS8)，基站不发送激活命令，也就是默认2个都被激活。
示例二
假设，基站配置的每个CSI-RS导频的端口数相同、配置了4个CSI-RS， 基站配置终端反馈L＝8个波束，频域压缩后每个波束对应4个系数，所反馈的秩(rank)＝1时，频域压缩后每个波束对应的系数的取值如表1所示：
波束索引 第一系数 第二系数 第三系数 第四系数
1 1 0 1 0
2 0 1 1 0
3 1 1 1 1
4 1 0 0 1
5 0 1 0 1
6 0 1 0 1
7 1 0 1 0
8 0 1 1 1
表1
其中，波束索引1、2对应第一个CSI-RS，波束索引3、4对应第二个CSI-RS，波束索引5、6对应第三个CSI-RS，波束索引7、8对应第四个CSI-RS。
则CSI包括的比特位图为：1010 0110 1111 1001 0101 0101 1010 0111，或者，CSI包括的比特位图为：10110010 01101101 11100011 00111101。
或者，频域压缩后每个波束对应的系数的取值如表2所示：
波束索引 第一系数 第二系数 第三系数 第四系数
1 1 0 1 0
2 0 1 1 0
3 1 1 1 1
4 1 0 0 1
5 0 0 0 0
6 0 0 0 0
7 1 0 1 0
8 0 1 1 1
表2
其中，波束索引1、2对应第一个CSI-RS，波束索引3、4对应第二个 CSI-RS，波束索引5、6对应第三个CSI-RS，波束索引7、8对应第四个CSI-RS。在表2中波束5、6对应的所有系数均为0，代表终端反馈的CSI中没有选择第三个CSI-RS。
则CSI包括的比特位图为：1010 0110 1111 1001 0000 0000 1010 0111；或者CSI包括的比特位图：10110010 01100001 11100011 00110001。
示例三
假设，基站配置的每个CSI-RS导频的端口数相同、配置了4个CSI-RS，基站配置终端反馈L1＝2个波束、L2＝4个波束、L3＝2个波束、L4＝2个波束，频域压缩后每个波束对应4个系数，所反馈的秩(rank)＝1，每个CSI-RS反馈一个比特位图；
则第一个CSI-RS频域压缩后每个波束对应的系数的取值如表3：
波束索引 第一系数 第二系数 第三系数 第四系数
1 1 0 1 0
2 0 1 1 0
表3
则第一个CSI-RS对应的比特位图为：10100110，或，10011100。
第二个CSI-RS频域压缩后每个波束对应的系数的取值如表4：
波束索引 第一系数 第二系数 第三系数 第四系数
1 1 0 1 0
2 0 1 1 0
3 1 1 1 1
4 1 0 0 1
表4
则第二个CSI-RS对应的比特位图为：1010011011111001，或，1011011011100011。
第三个CSI-RS频域压缩后每个波束对应的系数的取值如表5：
波束索引 第一系数 第二系数 第三系数 第四系数
1 1 0 1 0
2 0 1 0 1
表5
则第三个CSI-RS对应的比特位图为：10100101，或，10011001。
第四个CSI-RS频域压缩后每个波束对应的系数的取值如表6：
波束索引 第一系数 第二系数 第三系数 第四系数
1 0 1 1 1
2 1 1 0 1
表6
则第四个CSI-RS对应的比特位图为：01111101，或，01111011。
本申请实施例提供的CSI反馈方法，执行主体可以为CSI反馈装置。本申请实施例中以CSI反馈装置执行CSI反馈方法为例，说明本申请实施例提供的CSI反馈装置。
如图5所示，本申请实施例还提供一种信道状态信息CSI反馈装置500，包括：
第一确定模块501，用于确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；
第二确定模块502，用于测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；
发送模块503，用于向网络侧设备发送所述CSI。
作为一个可选实施例，所述第一确定模块包括：
第一接收子模块，用于接收网络侧设备配置的N个CSI-RS；
或者，
第二接收子模块，用于接收网络侧设备配置的M个CSI-RS，并接收激活信令；所述激活信令用于激活所述M个CSI-RS中的N个CSI-RS；其中， M为大于N的整数。
作为一个可选实施例，所述装置还包括：
第一配置接收模块，用于接收网络侧设备配置的N个CSI-RS需反馈的波束总数量，根据所述波束总数量确定各个CSI-RS分别需反馈的波束数量；或者，终端接收网络侧设备配置的各个CSI-RS分别需反馈的波束数量；
第三确定模块，用于根据各个CSI-RS分别需反馈的波束数量，确定所述P个CSI-RS分别对应的波束索引。
作为一个可选实施例，所述装置还包括：
第二配置接收模块，用于接收网络侧设备配置的子带预编码矩阵指示PMI的一个或多个取值；
第四确定模块，用于根据子带PMI的一个或多个取值对P个CSI-RS分别对应的预编码矩阵进行频域压缩，确定P个CSI-RS的需反馈波束经频域压缩后的系数。
作为一个可选实施例，所述P个CSI-RS对应的比特位图包括：一个比特位图，所述比特位图映射P个CSI-RS的需反馈波束经频域压缩后的系数；
或者，所述P个CSI-RS对应的比特位图包括：多个比特位图，每个比特位图映射一个CSI-RS的需反馈波束经频域压缩后的系数；
其中，所述P个CSI-RS对应的比特位图为所述终端根据网络配置或预先约定确定的。
作为一个可选实施例，在P小于N的情况下，所述CSI还包括：所述P个CSI-RS的标识信息。
作为一个可选实施例，所述装置还包括：
第一映射模块，用于根据网络配置或预先约定的映射规则，将P个CSI-RS的需反馈波束经频域压缩后的系数映射到一个比特位图上；
或者，
第二映射模块，用于根据网络配置或预先约定的映射规则，将每个CSI-RS的需反馈波束经频域压缩后的系数分别映射到对应的比特位图上。
作为一个可选实施例，所述映射规则包括下述至少一项：
按照CSI-RS的优先级高低顺序，映射到比特位图上；
按照CSI-RS的索引大小顺序，映射到比特位图上；
按照CSI-RS对应的波束索引大小顺序，映射到比特位图上；
按照CSI-RS的需反馈波束经频域压缩后的系数的标识大小顺序，映射到比特位图上；
按照CSI-RS对应的传输层标识大小顺序，映射到比特位图上；
按照CSI-RS对应的传输层优先级高低顺序，映射到比特位图上。
在本申请实施例中，在多点传输系统中终端对多个CSI-RS测量后向上报一个CSI，该CSI携带终端按照网络配置或预先约定的映射规则确定的CSI-RS对应的比特位图，网络侧设备能够依据对应的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系，从而实现终端和网络侧设备对比特位图的理解一致，提升CSI的正确传输效率。
需要说明的是，本申请实施例提供的信道状态信息CSI反馈装置是能够执行上述信道状态信息CSI反馈方法的装置，则上述信道状态信息CSI反馈方法的所有实施例均适用于该装置，且均能达到相同或相似的有益效果。
如图6所示，本申请实施例还提供一种信道状态信息CSI反馈装置600，包括：
接收模块601，用于接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N为大于1的整数；P为小于或者等于N的整数。
作为一个可选实施例，所述装置还包括：
第一配置模块，用于为终端配置N个CSI-RS；
或者，用于为终端配置M个CSI-RS，并向终端发送激活信令；所述激活信令用于指示激活所述M个CSI-RS中的N个CSI-RS；其中，M为大于N的整数。
作为一个可选实施例，所述装置还包括：
第二配置模块，用于为终端配置N个CSI-RS需反馈的波束总数量；
或者，用于为终端配置各个CSI-RS分别需反馈的波束数量。
作为一个可选实施例，所述装置还包括：
第三配置模块，用于为终端配置子带预编码矩阵指示PMI的一个或多个取值。
作为一个可选实施例，所述装置还包括：
第四配置模块，用于为终端配置所述终端反馈的CSI包括一个比特位图或多个比特位图；
其中，在所述CSI包括一个比特位图的情况下，该比特位图映射P个CSI-RS的需反馈波束经频域压缩后的系数；在所述CSI包括多个比特位图的情况下，每个比特位图映射一个CSI-RS的需反馈波束经频域压缩后的系数。
作为一个可选实施例，在P小于N的情况下，所述CSI还包括：所述P个CSI-RS的标识信息。
作为一个可选实施例，所述装置还包括：
第十确定模块，用于根据预先约定的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系。
作为一个可选实施例，所述映射规则包括下述至少一项：
按照CSI-RS的优先级高低顺序，映射到比特位图上；
按照CSI-RS的索引大小顺序，映射到比特位图上；
按照CSI-RS对应的波束索引大小顺序，映射到比特位图上；
按照CSI-RS的需反馈波束经频域压缩后的系数的标识大小顺序，映射到比特位图上；
按照CSI-RS对应的传输层标识大小顺序，映射到比特位图上；
按照CSI-RS对应的传输层优先级高低顺序，映射到比特位图上。
在本申请实施例中，在多点传输系统中终端对多个CSI-RS测量后向上报一个CSI，该CSI携带终端按照网络配置或预先约定的映射规则确定的CSI-RS对应的比特位图，网络侧设备能够依据对应的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系，从而实现终端和网络侧设备对比特位图的理解一致，提升CSI的正确传输效率。
需要说明的是，本申请实施例提供的信道状态信息CSI反馈装置是能够 执行上述信道状态信息CSI反馈方法的装置，则上述信道状态信息CSI反馈方法的所有实施例均适用于该装置，且均能达到相同或相似的有益效果。
本申请实施例中的信道状态信息CSI反馈装置可以是电子设备，例如具有操作系统的电子设备，也可以是电子设备中的部件，例如集成电路或芯片。该电子设备可以是终端，也可以为除终端之外的其他设备。示例性的，终端可以包括但不限于上述所列举的终端11的类型，其他设备可以为服务器、网络附属存储器(Network Attached Storage，NAS)等，本申请实施例不作具体限定。
本申请实施例提供的信道状态信息CSI反馈装置能够实现图1至图4的方法实施例实现的各个过程，并达到相同的技术效果，为避免重复，这里不再赘述。
可选的，如图7所示，本申请实施例还提供一种通信设备700，包括处理器701和存储器702，存储器702上存储有可在所述处理器701上运行的程序或指令，例如，该通信设备700为终端时，该程序或指令被处理器701执行时实现上述信道状态信息CSI反馈方法实施例的各个步骤，且能达到相同的技术效果。该通信设备700为网络侧设备时，该程序或指令被处理器701执行时实现上述信道状态信息CSI反馈方法实施例的各个步骤，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例还提供一种终端，包括处理器及通信接口，其中，所述处理器用于确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；所述通信接口用于向网络侧设备发送所述CSI。该终端实施例与上述终端侧方法实施例对应，上述方法实施例的各个实施过程和实现方式均可适用于该终端实施例中，且能达到相同的技术效果。具体地，图8为实现本申请实施例的一种终端的硬件结构示意图。
该终端800包括但不限于：射频单元801、网络模块802、音频输出单元803、输入单元804、传感器805、显示单元806、用户输入单元807、接口单 元808、存储器809以及处理器810等中的至少部分部件。
本领域技术人员可以理解，终端800还可以包括给各个部件供电的电源(比如电池)，电源可以通过电源管理系统与处理器810逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。图8中示出的终端结构并不构成对终端的限定，终端可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置，在此不再赘述。
应理解的是，本申请实施例中，输入单元804可以包括图形处理单元(Graphics Processing Unit，GPU)8041和麦克风8042，图形处理器8041对在视频捕获模式或图像捕获模式中由图像捕获装置(如摄像头)获得的静态图片或视频的图像数据进行处理。显示单元806可包括显示面板8061，可以采用液晶显示器、有机发光二极管等形式来配置显示面板8061。用户输入单元807包括触控面板8071以及其他输入设备8072中的至少一种。触控面板8071，也称为触摸屏。触控面板8071可包括触摸检测装置和触摸控制器两个部分。其他输入设备8072可以包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆，在此不再赘述。
本申请实施例中，射频单元801接收来自网络侧设备的下行数据后，可以传输给处理器810进行处理；另外，射频单元801可以向网络侧设备发送上行数据。通常，射频单元801包括但不限于天线、放大器、收发信机、耦合器、低噪声放大器、双工器等。
存储器809可用于存储软件程序或指令以及各种数据。存储器809可主要包括存储程序或指令的第一存储区和存储数据的第二存储区，其中，第一存储区可存储操作系统、至少一个功能所需的应用程序或指令(比如声音播放功能、图像播放功能等)等。此外，存储器809可以包括易失性存储器或非易失性存储器，或者，存储器809可以包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，静态随机存取存储器(Static RAM，SRAM)、动态随机存取 存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDRSDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synch link DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DRRAM)。本申请实施例中的存储器809包括但不限于这些和任意其它适合类型的存储器。
处理器810可包括一个或多个处理单元；可选的，处理器810集成应用处理器和调制解调处理器，其中，应用处理器主要处理涉及操作系统、用户界面和应用程序等的操作，调制解调处理器主要处理无线通信信号，如基带处理器。可以理解的是，上述调制解调处理器也可以不集成到处理器810中。
其中，处理器810，用于确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；
射频单元801，用于向网络侧设备发送所述CSI。
在本申请实施例中，在多点传输系统中终端对多个CSI-RS测量后向上报一个CSI，该CSI携带终端按照网络配置或预先约定的映射规则确定的CSI-RS对应的比特位图，网络侧设备能够依据对应的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系，从而实现终端和网络侧设备对比特位图的理解一致，提升CSI的正确传输效率。
需要说明的是，本申请实施例提供的终端是能够执行上述信道状态信息CSI反馈方法的终端，则上述信道状态信息CSI反馈方法的所有实施例均适用于该终端，且均能达到相同或相似的有益效果。
本申请实施例还提供一种网络侧设备，包括处理器及通信接口，其中，所述通信接口用于接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N 为大于1的整数；P为小于或者等于N的整数。该网络侧设备实施例与上述网络侧设备方法实施例对应，上述方法实施例的各个实施过程和实现方式均可适用于该网络侧设备实施例中，且能达到相同的技术效果。
具体地，本申请实施例还提供了一种网络侧设备。如图9所示，该网络侧设备900包括：天线91、射频装置92、基带装置93、处理器94和存储器95。天线91与射频装置92连接。在上行方向上，射频装置92通过天线91接收信息，将接收的信息发送给基带装置93进行处理。在下行方向上，基带装置93对要发送的信息进行处理，并发送给射频装置92，射频装置92对收到的信息进行处理后经过天线91发送出去。
以上实施例中网络侧设备执行的方法可以在基带装置93中实现，该基带装置93包括基带处理器。
基带装置93例如可以包括至少一个基带板，该基带板上设置有多个芯片，如图9所示，其中一个芯片例如为基带处理器，通过总线接口与存储器95连接，以调用存储器95中的程序，执行以上方法实施例中所示的网络设备操作。
该网络侧设备还可以包括网络接口96，该接口例如为通用公共无线接口(common public radio interface，CPRI)。
具体地，本发明实施例的网络侧设备900还包括：存储在存储器95上并可在处理器94上运行的指令或程序，处理器94调用存储器95中的指令或程序执行图6所示各模块执行的方法，并达到相同的技术效果，为避免重复，故不在此赘述。
本申请实施例还提供一种可读存储介质，所述可读存储介质上存储有程序或指令，该程序或指令被处理器执行时实现上述信道状态信息CSI反馈方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
其中，所述处理器为上述实施例中所述的终端中的处理器。所述可读存储介质，包括计算机可读存储介质，如计算机只读存储器ROM、随机存取存储器RAM、磁碟或者光盘等。
本申请实施例另提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现上述 信道状态信息CSI反馈方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
应理解，本申请实施例提到的芯片还可以称为系统级芯片，系统芯片，芯片系统或片上系统芯片等。
本申请实施例另提供了一种计算机程序/程序产品，所述计算机程序/程序产品被存储在存储介质中，所述计算机程序/程序产品被至少一个处理器执行以实现上述信道状态信息CSI反馈方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例还提供了一种通信系统，包括：终端及网络侧设备，所述终端可用于执行如上所述的信道状态信息CSI反馈方法的步骤，所述网络侧设备可用于执行如上所述的信道状态信息CSI反馈方法的步骤。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。此外，需要指出的是，本申请实施方式中的方法和装置的范围不限按示出或讨论的顺序来执行功能，还可包括根据所涉及的功能按基本同时的方式或按相反的顺序来执行功能，例如，可以按不同于所描述的次序来执行所描述的方法，并且还可以添加、省去、或组合各种步骤。另外，参照某些示例所描述的特征可在其他示例中被组合。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以计算机软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (21)

  1. 一种信道状态信息CSI反馈方法，包括：
    终端确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；
    终端测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；
    终端向网络侧设备发送所述CSI。
  2. 根据权利要求1所述的方法，其中，所述终端确定待测量的N个CSI-RS，包括：
    终端接收网络侧设备配置的N个CSI-RS；
    或者，
    终端接收网络侧设备配置的M个CSI-RS，并接收激活信令；所述激活信令用于激活所述M个CSI-RS中的N个CSI-RS；其中，M为大于N的整数。
  3. 根据权利要求1或2所述的方法，其中，所述方法还包括：
    终端接收网络侧设备配置的N个CSI-RS需反馈的波束总数量，根据所述波束总数量确定各个CSI-RS分别需反馈的波束数量；或者，终端接收网络侧设备配置的各个CSI-RS分别需反馈的波束数量；
    所述终端根据各个CSI-RS分别需反馈的波束数量，确定所述P个CSI-RS分别对应的波束索引。
  4. 根据权利要求1或2所述的方法，其中，所述方法还包括：
    终端接收网络侧设备配置的子带预编码矩阵指示PMI的一个或多个取值；
    所述终端根据子带PMI的一个或多个取值对P个CSI-RS分别对应的预编码矩阵进行频域压缩，确定P个CSI-RS的需反馈波束经频域压缩后的系数。
  5. 根据权利要求1或2所述的方法，其中，
    所述P个CSI-RS对应的比特位图包括：一个比特位图，所述比特位图映 射P个CSI-RS的需反馈波束经频域压缩后的系数；
    或者，所述P个CSI-RS对应的比特位图包括：多个比特位图，每个比特位图映射一个CSI-RS的需反馈波束经频域压缩后的系数；
    其中，所述P个CSI-RS对应的比特位图为所述终端根据网络配置或预先约定确定的。
  6. 根据权利要求1或2所述的方法，其中，在P小于N的情况下，所述CSI还包括：所述P个CSI-RS的标识信息。
  7. 根据权利要求4所述的方法，其中，所述方法还包括：
    终端根据网络配置或预先约定的映射规则，将P个CSI-RS的需反馈波束经频域压缩后的系数映射到一个比特位图上；
    或者，
    终端根据网络配置或预先约定的映射规则，将每个CSI-RS的需反馈波束经频域压缩后的系数分别映射到对应的比特位图上。
  8. 根据权利要求7所述的方法，其中，所述映射规则包括下述至少一项：
    按照CSI-RS的优先级高低顺序，映射到比特位图上；
    按照CSI-RS的索引大小顺序，映射到比特位图上；
    按照CSI-RS对应的波束索引大小顺序，映射到比特位图上；
    按照CSI-RS的需反馈波束经频域压缩后的系数的标识大小顺序，映射到比特位图上；
    按照CSI-RS对应的传输层标识大小顺序，映射到比特位图上；
    按照CSI-RS对应的传输层优先级高低顺序，映射到比特位图上。
  9. 一种信道状态信息CSI反馈方法，包括：
    网络侧设备接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N为大于1的整数；P为小于或者等于N的整数。
  10. 根据权利要求9所述的方法，其中，所述方法还包括：
    网络侧设备为终端配置N个CSI-RS；
    或者，
    网络侧设备为终端配置M个CSI-RS，并向终端发送激活信令；所述激活信令用于指示激活所述M个CSI-RS中的N个CSI-RS；其中，M为大于N的整数。
  11. 根据权利要求9或10所述的方法，其中，所述方法还包括：
    网络侧设备为终端配置N个CSI-RS需反馈的波束总数量；
    或者，
    网络侧设备为终端配置各个CSI-RS分别需反馈的波束数量。
  12. 根据权利要求9或10所述的方法，其中，所述方法还包括：
    网络侧设备为终端配置子带预编码矩阵指示PMI的一个或多个取值。
  13. 根据权利要求9或10所述的方法，其中，所述方法还包括：
    网络侧设备为终端配置所述终端反馈的CSI包括一个比特位图或多个比特位图；
    其中，在所述CSI包括一个比特位图的情况下，该比特位图映射P个CSI-RS的需反馈波束经频域压缩后的系数；在所述CSI包括多个比特位图的情况下，每个比特位图映射一个CSI-RS的需反馈波束经频域压缩后的系数。
  14. 根据权利要求9或10所述的方法，其中，在P小于N的情况下，所述CSI还包括：所述P个CSI-RS的标识信息。
  15. 根据权利要求9或10所述的方法，其中，所述方法还包括：
    网络侧设备根据预先约定的映射规则，确定所述CSI中的比特位图与CSI-RS的需反馈波束经频域压缩后的系数的映射关系。
  16. 根据权利要求15所述方法，其中，所述映射规则包括下述至少一项：
    按照CSI-RS的优先级高低顺序，映射到比特位图上；
    按照CSI-RS的索引大小顺序，映射到比特位图上；
    按照CSI-RS对应的波束索引大小顺序，映射到比特位图上；
    按照CSI-RS的需反馈波束经频域压缩后的系数的标识大小顺序，映射到比特位图上；
    按照CSI-RS对应的传输层标识大小顺序，映射到比特位图上；
    按照CSI-RS对应的传输层优先级高低顺序，映射到比特位图上。
  17. 一种信道状态信息CSI反馈装置，包括：
    第一确定模块，用于确定待测量的N个信道状态信息参考信号CSI-RS；N为大于1的整数；
    第二确定模块，用于测量所述N个CSI-RS，得到CSI；其中，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；P为小于或者等于N的整数；
    发送模块，用于向网络侧设备发送所述CSI。
  18. 一种终端，包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如权利要求1至8任一项所述的信道状态信息CSI反馈方法的步骤。
  19. 一种信道状态信息CSI反馈装置，包括：
    接收模块，用于接收终端测量N个CSI-RS后反馈的CSI，所述CSI包括：传输秩，P个CSI-RS分别对应的波束索引，以及，P个CSI-RS对应的比特位图，所述比特位图用于指示CSI-RS的需反馈波束经频域压缩后的系数；N为大于1的整数；P为小于或者等于N的整数。
  20. 一种网络侧设备，包括处理器和存储器，所述存储器存储可在所述处理器上运行的程序或指令，所述程序或指令被所述处理器执行时实现如权利要求9至16任一项所述的信道状态信息CSI反馈方法的步骤。
  21. 一种可读存储介质，所述可读存储介质上存储程序或指令，所述程序或指令被处理器执行时实现如权利要求1-8任一项所述的信道状态信息CSI反馈方法，或者实现如权利要求9至16任一项所述的信道状态信息CSI反馈方法的步骤。
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