CN116996102A - Feedback method of PMI (precoding matrix indicator) transmitted by multiple TRPs (time division multiple access), terminal and network side equipment - Google Patents

Feedback method of PMI (precoding matrix indicator) transmitted by multiple TRPs (time division multiple access), terminal and network side equipment Download PDF

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Publication number
CN116996102A
CN116996102A CN202211228519.6A CN202211228519A CN116996102A CN 116996102 A CN116996102 A CN 116996102A CN 202211228519 A CN202211228519 A CN 202211228519A CN 116996102 A CN116996102 A CN 116996102A
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trp
target
trps
orthogonal beam
orthogonal
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袁江伟
宋扬
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Priority to PCT/CN2023/090275 priority Critical patent/WO2023207898A1/en
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    • 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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The application discloses a feedback method of PMI transmitted by multiple TRPs, a terminal and network side equipment, belonging to the field of wireless communication, wherein the feedback method of PMI transmitted by multiple TRPs comprises the following steps: the terminal determines an orthogonal beam group set corresponding to each TRP according to target parameters configured by the network side for a plurality of TRPs allowing joint transmission; selecting a target orthogonal beam group corresponding to TRP from the orthogonal beam group set corresponding to each TRP according to the channel information of each TRP, and selecting a preset number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group; determining a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back a preset number of target orthogonal beams in each target orthogonal beam group; the terminal sends a PMI parameter, wherein the PMI parameter comprises a first feedback parameter and a second feedback parameter.

Description

Feedback method of PMI (precoding matrix indicator) transmitted by multiple TRPs (time division multiple access), terminal and network side equipment
Cross Reference to Related Applications
The application claims Chinese patent application No.202210442243.5 filed in China at 2022, 4 and 25 days Priority, the entire contents of which are incorporated herein by reference.
Technical Field
The application belongs to the technical field of wireless communication, and particularly relates to a feedback method, a terminal and network side equipment of PMI transmitted by multiple transmission receiving points (Transmission Reception Point, TRP).
Background
Coordinated multi-point transmission (Coordinated Multiple Points, coMP) transmission refers to a plurality of geographically separated transmission reception points (Transmission Reception Point, TRP) that participate in coordination for data transmission by one terminal or in joint reception of data sent by one terminal, and the plurality of transmission points participating in coordination generally refer to base stations of different cells. The interference signals can be used as useful signals by the cooperation of the plurality of cell base stations, so that the interference among cells is reduced, and the spectrum utilization rate of the system is improved.
Each CoMP scheme in common can be categorized into one of the following categories: joint processing (JointProcessing, JP) or coordinated scheduling (Collaborative Scheduling, CS)/coordinated beamforming (Coordinated Beamforming, CB).
Wherein Joint Processing (JP) refers to that data of one UE is available on more than one time-frequency resource point in the CoMP cooperating set, comprising:
(1) Joint transmission (Joint Transmission, JT). For example, data is simultaneously transmitted from multiple points (a part of the CoMP cooperating set or the whole CoMP cooperating set) to one UE or multiple UEs in one time-frequency resource. Alternatively, data is transmitted from multiple points simultaneously to the UE, e.g., improving (coherently or incoherently) received signal quality and/or data throughput.
(2) Dynamic pointing (Dynamic Point Selection, DPS)/frequency modulation. Data transmission is performed from one point (within the CoMP cooperating set) in one time-frequency resource. The transmission/mixing point may change from one subframe to another subframe, including a change over RB pair within one subframe. The data is available at multiple points simultaneously. Dynamic spot/frequency modulation may include Dynamic Cell Selection (DCS).
(3) DPS is combined with JT. In this case, a plurality of points may be selected in the time-frequency resource for data transmission. Coordinated scheduling/beamforming (CS/CB) means that for one time-frequency resource, data of the UE is available only at one point of the CoMP cooperating set and transmitted from that point (DL data transmission starts from that point), but decision of user scheduling/beamforming is coordinated among points corresponding to the CoMP cooperating set. The choice of the transmission point is semi-static, i.e. semi-static setpoint (SSPS), i.e. the transmission point can only be changed in a semi-static manner each time from one point to a specific UE.
In the related art, considering the problem of precoding matrix indicator (Precoding matrix indicator, PMI) feedback overhead, the design of the codebook increases frequency domain compression, and expands the supported highest Rank (Rank) number to 4, and increases the distribution situation of non-zero coefficients of the PMI feedback indicated by the Bitmap mode. Wherein codebook generation for each layer can be expressed by the following formula:
Wherein, the liquid crystal display device comprises a liquid crystal display device,representing dimension N 1 N 2 X1 DFT beam vector;
wherein the method comprises the steps of Is the magnitude coefficient of polarization direction r=0,is the magnitude coefficient of polarization direction r=1, +.>The amplitude coefficient and the phase coefficient corresponding to the tap m wave beam i; w (W) f ＝[f 0 f 1 …f Mv-1 ]，f i I.epsilon. {0,1, …, mv-1} represents the dimension 1 XN 3 Is a DFT vector of (c). When the terminal feeds back the PMI, the feedback is used for acquiring or indicating W 1 、/>And W is f Is used for the codebook coefficients of (a).
However, the current codebook parameter definition and parameter value are mainly performed for PMI of one TRP, so the feedback method of PMI parameter in the related art is not suitable for the scenario of cooperative transmission of multiple TRPs.
Disclosure of Invention
The embodiment of the application provides a feedback method of PMI transmitted by multiple TRPs, a terminal and network side equipment, which can solve the problem that the feedback method of PMI parameters in the related technology is not suitable for scenes of cooperative transmission of multiple TRPs.
In a first aspect, a feedback method of PMI for multi-TRP transmission is provided, including: the terminal determines an orthogonal beam group set corresponding to each TRP according to target parameters configured by the network side for a plurality of TRPs allowing joint transmission; selecting a target orthogonal beam group corresponding to each TRP from the orthogonal beam group set corresponding to each TRP according to the channel information of each TRP, and selecting a preset number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group; determining a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back the target orthogonal beams of the preset number in each target orthogonal beam group; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; the terminal sends a PMI parameter, wherein the PMI parameter comprises the first feedback parameter and the second feedback parameter.
In a second aspect, there is provided a feedback apparatus of PMI for multi-TRP transmission, including: a first determining module, configured to determine, according to a target parameter configured by a network side for a plurality of TRPs allowing joint transmission, an orthogonal beam group set corresponding to each TRP; a selecting module, configured to select, according to channel information of each TRP, a target orthogonal beam group corresponding to the TRP from the orthogonal beam group set corresponding to each TRP, and select a predetermined number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group; a second determining module, configured to determine a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; the first sending module is configured to send a PMI parameter, where the PMI parameter includes the first feedback parameter and the second feedback parameter.
In a third aspect, a PMI acquisition method for multi-TRP transmission is provided, including: the network side equipment indicates target parameters of a plurality of TPRs which are allowed to be jointly transmitted to the terminal; receiving a PMI parameter sent by the terminal, wherein the PMI parameter comprises a first feedback parameter and a second feedback parameter; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; and the network side equipment acquires PMIs of the TRPs according to the PMI parameters.
In a fourth aspect, there is provided a PMI acquisition apparatus for multi-TRP transmission, including: a second transmitting module for indicating to the terminal target parameters of the plurality of TPRs that allow joint transmission; the receiving module is used for receiving PMI parameters sent by the terminal, wherein the PMI parameters comprise a first feedback parameter and a second feedback parameter; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; an acquisition module, configured to acquire PMIs of the TRPs according to the PMI parameters.
In a fifth aspect, there is provided a terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method as described in the first aspect.
In a sixth aspect, a terminal is provided, including a processor and a communication interface, where the processor is configured to implement the steps of the method according to the first aspect, and the communication interface is configured to communicate with an external device.
In a seventh aspect, a network side device is provided, comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method according to the third aspect.
In an eighth aspect, a network side device is provided, which includes a processor and a communication interface, where the processor is configured to implement the steps of the method according to the third aspect, and the communication interface is configured to communicate with an external device.
In a ninth aspect, there is provided a feedback system of PMI for multi-TRP transmission, including: a terminal operable to perform the steps of the method as described in the first aspect, and a network side device operable to perform the steps of the method as described in the third aspect.
In a tenth aspect, there is provided a readable storage medium having stored thereon a program or instructions which when executed by a processor, performs the steps of the method according to the first aspect, or performs the steps of the method according to the third aspect.
In an eleventh aspect, there is provided a chip comprising a processor and a communication interface, the communication interface and the processor being coupled, the processor being for running a program or instructions, implementing the steps of the method according to the first aspect, or implementing the steps of the method according to the third aspect.
In a twelfth aspect, there is provided a computer program/program product stored in a storage medium, the computer program/program product being executed by at least one processor to implement the steps of the method as described in the first aspect, or to implement the steps of the method as described in the third aspect.
In the embodiment of the application, a terminal acquires an orthogonal beam group set corresponding to each TRP according to a target parameter configured by a network side for a plurality of TRPs allowing joint transmission, selects the target orthogonal beam group corresponding to each TRP according to channel information of each TRP, selects a plurality of target orthogonal beams corresponding to each TRP from each target orthogonal beam group, and then determines a first feedback parameter for feeding back the target orthogonal beam group corresponding to each TRP and a second feedback parameter for feeding back the target orthogonal beams of the preset number in each target orthogonal beam group, and sends a PMI parameter comprising the first feedback parameter and the second feedback parameter, thereby being capable of feeding back the PMI parameter and improving the performance of multi-TRP transmission under the condition of multi-TRP joint transmission.
Drawings
Fig. 1 shows a block diagram of a wireless communication system to which embodiments of the present application are applicable;
fig. 2 is a schematic flow chart of a feedback method of PMI transmitted by multiple TRPs according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a PMI acquisition method for multi-TRP transmission according to an embodiment of the present application;
fig. 4 is a schematic flow chart of another feedback method of PMI transmitted by multiple TRPs according to the embodiment of the present application;
fig. 5 shows a schematic structural diagram of a feedback device of a PMI transmitted by multiple TRPs according to an embodiment of the present application;
fig. 6 shows a schematic structural diagram of a PMI acquisition apparatus for multi-TRP transmission according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 8 shows a schematic hardware structure of a terminal according to an embodiment of the present application;
fig. 9 shows a schematic hardware structure of a network side device according to an embodiment of the present application.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the application, fall within the scope of protection of the application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. 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 otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/" generally means a relationship in which the associated object is an "or" before and after.
It should be noted that the techniques described in the embodiments of the present application are not limited to long term evolution (Long Term Evolution, LTE)/LTE-Advanced (LTE-a) systems, but may also be used in other wireless communication systems, such as Code Division multiple access (Code Division multiple access)Multiple Access, CDMA), time division Multiple Access (Time Division Multiple Access, TDMA), frequency division Multiple Access (Frequency Division Multiple Access, FDMA), orthogonal frequency division Multiple Access (Orthogonal Frequency Division Multiple Access, OFDMA), single-Carrier frequency division Multiple Access (SC-carrier Frequency Division Multiple Access, FDMA), and other systems. The terms "system" and "network" in embodiments of the application are often used interchangeably, and the techniques described may be used for both the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a new air interface (NR) system for purposes of example and uses NR terminology in much of the description that follows, but these techniques are also applicable to applications other than NR system applications, such as generation 6 (6) th Generation, 6G) communication system.
Fig. 1 shows a block diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network device 12. The terminal 11 may be a mobile phone, a tablet (Tablet Personal Computer), a Laptop (Laptop Computer) or a terminal-side Device called a notebook, a personal digital assistant (Personal Digital Assistant, PDA), a palm top, a netbook, an ultra-mobile personal Computer (ultra-mobile personal Computer, UMPC), a mobile internet appliance (Mobile Internet Device, MID), an augmented reality (augmented reality, AR)/Virtual Reality (VR) Device, a robot, a Wearable Device (weather Device), a vehicle-mounted Device (VUE), a pedestrian terminal (PUE), a smart home (home Device with a wireless communication function, such as a refrigerator, a television, a washing machine, or a furniture), a game machine, a personal Computer (personal Computer, PC), a teller machine, or a self-service machine, and the Wearable Device includes: intelligent wrist-watch, intelligent bracelet, intelligent earphone, intelligent glasses, intelligent ornament (intelligent bracelet, intelligent ring, intelligent necklace, intelligent anklet, intelligent foot chain etc.), intelligent wrist strap, intelligent clothing 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 comprise an access network device and/or a core network device, wherein the access network device 12 may also be referred to as a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function or a radio access network element. Access network device 12 may include a base station, which may be referred to as a node B, an evolved node B (eNB), an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a home node B, a home evolved node B, a transmitting/receiving point (TransmittingReceivingPoint, TRP), or some other suitable terminology in the art, a WLAN access point, a WiFi node, etc., and is not limited to a particular technical vocabulary so long as the same technical effect is achieved, and it should be noted that in the embodiment of the present application, only a base station in an NR system is described as an example, and the specific type of the base station is not limited. The core network device may include, but is not limited to, at least one of: a core network node, a core network function, a mobility management entity (Mobility Management Entity, MME), an access mobility management function (Access and Mobility Management Function, AMF), a session management function (Session Management Function, SMF), a user plane function (User Plane Function, UPF), a policy control function (Policy Control Function, PCF), a policy and charging rules function (Policy and Charging Rules Function, PCRF), an edge application service discovery function (EdgeApplicationServerDiscoveryFunction, EASDF), unified data management (Unified Data Management, UDM), unified data repository (Unified Data Repository, UDR), a home subscriber server (Home Subscriber Server, HSS), a centralized network configuration (Centralized network configuration, CNC), a network storage function (Network Repository Function, NRF), a network opening function (NetworkExposureFunction, NEF), a local NEF (LocalNEF, or L-NEF), a binding support function (Binding Support Function, BSF), an application function (Application Function, AF), and the like. It should be noted that, in the embodiment of the present application, only the core network device in the NR system is described as an example, and the specific type of the core network device is not limited.
In the related art, the R16 TypeII codebook designs the codebook by utilizing the beam combination principle, and the design of the R16 TypeII codebook increases the frequency domain compression in consideration of the PMI feedback overhead, expands the supported highest Rank number to 4, and increases the distribution condition of non-zero coefficients of the PMI feedback indicated by a Bitmap mode.
Wherein codebook generation for each layer can be expressed by the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,
representing dimension N 1 N 2 X1 DFT beam vector;
wherein the method comprises the steps of Is the magnitude coefficient of polarization direction r=0,is the magnitude coefficient of polarization direction r=1, +.>The amplitude coefficient and the phase coefficient corresponding to the tap m wave beam i; w (W) f ＝[f 0 f 1 …f Mv-1 ]，f i I.epsilon. {0,1, …, mv-1} represents the dimension 1 XN 3 Is a DFT vector of (c).
The terminal can feed back in the PMI for acquiring or indicating W 1 、And W is f Codebook coefficients of (2), networkThe side equipment can acquire W according to the PMI fed back by the terminal 1 、/>And W is f 。
(1) For W 1
According to i in PMI 1,1 And i 1,2 L beam vectors are calculatedBeam vector and subscript->The confirmation method is as follows:
wherein [ q 1 ,q 2 ]According to i in PMI 1,1 The calculation method is as follows:
i 1,1 ＝[q 1 q 2 ]
q 1 ∈{0,1,K,O 1 -1}
q 2 ∈{0,1,K,O 2 -1}
[n 1 ,n 2 ]according to i in PMI 1,2 Obtained.
(2) For the following
1) Calculating the strongest coefficient amplitude
Layer l the strongest coefficients for each polarization direction are expressed asIn which the stronger coefficients are quantized to 1, so that no reporting is required, the next strongest coefficients are represented by PMIi 2,3,l Indication (S)>p∈{0,1}，/>To->The mapping rules of (2) are shown in table 1.
Table 1.
2) Calculating the amplitude and phase of each tap
Layer l each tap amplitude coefficient is expressed as
According to PMIi 2,4,l The determination is that the value is expressed as follows
Wherein the method comprises the steps ofTo->The mapping rules of (2) are shown in table 2.
Table 2.
Layer l each tap phase is quantized with 16PSK and the coefficients are expressed as
From PMIIndication, wherein c l,f ＝[c l,0,f …c l,2L-1,f ]，c l,i,f ∈{0,…,15}。
i 2,4,l And i 2,5,l Only the amplitude and phase of the non-zero and non-strongest coefficients in feedback layer l, wherein the distribution of non-zero coefficients is defined by i 1,7,l Indicated in a Bitmap manner forThe coefficients, amplitude and phase of (c) are all set to 0.
The beam index corresponding to the strongest coefficient isCan be represented by i 1,8,l Calculation and acquisition, wherein the formula is
I.e. for rank=1, i 1,8,l Indicating the strongest beam as the firstBeams corresponding to non-zero coefficients, for beams greater than rank>1, i 1,8,l Indicating the strongest beam as +.>And a beam.
The UE indexes the tap with the strongest coefficient in the process of calculating the codebook l * Re-mapping the reference, the mapped strongest tap index f l * Becomes 0, so the location of the strongest coefficient is known, and its magnitude indexPhase coefficientIt is known that no UE feedback is required.
(3) For the following
Comprises Mv DFT vectors, wherein->Can be expressed as +.>t＝{0,1,…,N 3 -1}, where N 3 For the number of PMI subbands, i.e. the total number of taps, mv denotes the number of taps reserved, The calculation formula of (2) is
Wherein the method comprises the steps ofThe remapped Mv tap indexes obtained for the UE are subjected to the rule of remapping
f＝(f-f l * )mod M υ
Wherein f l * For the strongest coefficient tap index, it can be seen that after remapping
When N is 3 When the temperature is less than or equal to 19,from i in PMI 1,6,l Obtained if M υ ＝1，i 1,6,l =0, and no feedback;
when N is 3 >At the time of 19, the number of the holes is reduced,from i in PMI 1,6,l M is as follows initial Obtaining, only non-zero +.>Is fed back. Wherein M is initial ∈{-2M υ +1,-2M υ +2, …,0} can be represented by i 1,5 (Note: layercomon) is obtained
Wherein, obtain i 1,6,l Acquisition ofProcess and acquisition W of (2) 1 The beam serial numbers are consistent, and the beam serial numbers are obtained by using the combination number. Wherein for greater than M initial +N3-1>It is mapped to 0,1, …,2M υ -1, and then solving the number of combinations.
In the related art, the coefficient of the PMI coefficient is i 1 And i 2 Wherein i is 1 Includes i 1,1 、i 1,2 、i 1,5 、i 1,6,v 、i 1,7,v 、i 1,8,v ，i 2 Includes i 2,3,v 、i 2,4,v 、i 2,5,v Where v=one or more of 1,2,3,4. For RI value 2, v=1, 2, RI value 4, v=1, 2,3,4.
Wherein, the liquid crystal display device comprises a liquid crystal display device,
i 1,1 for indicating orthogonal DFT vector group sequence number equal to q 1 ,q 2 ]Wherein q is 1 ∈{0,1,…,O 1 -1}，q 2 ∈{0,1,…,O 2 -1}，O 1 ,O 2 An oversampling factor configured for the network;
i 1,2 for indicating i 1,1 L vector sequence numbers in the indicated orthogonal DFT vector set equal toWherein N1 and N2 are parameters of port number of network configuration, L is the number of DFT vectors indicated by the network, and +.>Representing the slave N 1 N 2 The number of combinations of L beams is selected from the plurality of beams. i.e 1,2 The mapping with the L DFT vector numbers is shown in table 3.
Table 3.
i 1,5 Indication length of 2M v Starting position M of window of (2) initial The value range is i 1,5 ∈{0,1,…,2M v -1}, wherein M v Representing the number of time domain taps. Note that: exist only in N 3 >19, when N 3 When the temperature is less than or equal to 19, i 1,5 =0 and the terminal does not need to feed back the coefficient.
i 1,6,v M for layer v feedback v The tap coefficients are N 3 The position in each tap coefficient is divided into two cases, N 3 >19, the value range isWhen N is 3 When the value is less than or equal to 19, the value range is +.>Feedback is provided by way of a combination number. />
i 1,7,v For layrv non-zero coefficient indication, for bit (bit) sequence, total length is 2LM v 。
i 1,8,v For layrv strongest coefficient indication, the value range is i 1,8,v E {0,1, …,2L-1}, where i for rank=1 transmission 1,8,v Represents the ith 1,8,v A non-zero coefficient, i for transmissions greater than rank=1 1,8,v Represents the ith 1,8,v And coefficients.
i 2,3,v For the quantized indication of the amplitude coefficients of two polarizations of layerv, each amplitude coefficient is a 4-bit string (bitstring), and each code point (codepoint) corresponds to a quantized value, wherein the amplitude coefficient of the polarization where the strongest coefficient is located is not fed back, and is assumed to be 1.
i 2,4,v For amplitude coefficient quantization indication of all tap coefficients of layerv, each amplitude coefficient is 3 bits of bitstring, each codepoint corresponds to a quantization value, and 2LM is obtained in total v And a magnitude coefficient. Wherein the amplitude coefficient of the strongest coefficient is not fed back, and the rest coefficients only feed back amplitude non-zero coefficients, so that the number of total feedback coefficients for layerrv is K NZ,v -1, wherein K Nz,v The number of layer v amplitude non-zero coefficients is represented.
i 2,5,v For the phase coefficient quantization indication of all tap coefficients of layerv, each coefficient is 4bit string, each code point corresponds to a quantization value, and 2LM is obtained in total v And phase coefficients. Wherein the phase coefficient of the strongest coefficient is not fed back, and is assumed to be 0, and the residual coefficient only feeds back the phase coefficient corresponding to the non-zero coefficient of the amplitude, so that the total feedback coefficient number for layerrv is K NZ,v -1, wherein K NZ,v Representing the number of non-zero coefficients in amplitude.
The mapping order of the specific individual coefficients is shown in table 4.
Table 4.
i 2,4,v ,i 2,5,v ,i 1,7,v The bit priority of the bit is determined according to the priority value calculated by each bit, the lower the priority value is, the higher the priority is, and the calculation formula is as follows:
Pri(l,i,f)＝2*L*v*π(f)+v*i+l
wherein, the liquid crystal display device comprises a liquid crystal display device,
from the formula pi (f), the value range is pi (f) ∈0,1, …, N 3 -1, and corresponds from small to largeIn the order of 0, N 3 -1,1,N 3 -2,2,N 3 -3…。
From the formula Pri (l, i, f) it can be seen that the weight of pi (f) is greatest, followed by i, followed by l, so that the order of the priorities from high to low is seen as shown in Table 5.
Table 5.
Therefore, the current parameter definition and parameter value of the R16 Type2 codebook are mainly performed for PMI of one TRP, and if the spatial beam of each TRP needs to be fed back for the joint transmission scheme of multiple TRPs, the feedback overhead can not be reduced by directly using the spatial beam and a certain optimization space, so that the feedback can be enhanced to reduce the feedback overhead.
The feedback scheme of the PMI of the multi-TRP transmission provided by the embodiment of the present application is described in detail below by some embodiments and application scenarios thereof with reference to the accompanying drawings.
Fig. 2 shows a flowchart of a method for feedback of PMIs for multi-TRP transmission in an embodiment of the present application, and the method 200 may be performed by a terminal. In other words, the method may be performed by software or hardware installed on the terminal. As shown in fig. 2, the method may include the following steps.
S210, the terminal determines an orthogonal beam group set corresponding to each TRP according to target parameters configured by the network side for a plurality of TRPs allowing joint transmission.
In the embodiment of the present application, the network side may configure the target parameter for a plurality of TRPs that allow joint transmission, where the target parameter may be indicated to the terminal through a high layer signaling, or may be configured to the terminal through a high layer configuration signaling.
In one possible implementation, S210 may include the following steps 1 to 3.
Step 1, obtaining target parameters of the TRPs.
In an alternative implementation, the target parameters may include port configuration parameters of each of the TRPs, that is, the target parameters may include: port configuration parameter N 1,i And N 2,i Wherein N is 1,i And N 2,i The number of antenna ports configured in two dimensions of the same polarization for the TRP i at the network side is respectively the (i+1) th TRP in the plurality of TRPs, i is {0,1, …, N Ntrp -1}，N Ntrp Is the number of the plurality of TRPs. Wherein the number N of the plurality of TRPs Ntrp Either predetermined or indicated at the network side.
In an alternative implementation, the target parameters may include: the port configuration parameters of each TRP and the number N of a plurality of TRPs Ntrp . That is, in this possible implementation, N Ntrp The number of TRPs configured for the network side, i.e. configured for the network side, that allow joint transmission.
In the above alternative implementation, optionally, the configuration that the network side may display allows the number N of TRP jointly transmitted Ntrp The number N of TRPs that allow joint transmission can also be implicitly configured Ntrp For example, implicit indication of the number N of TRPs that are allowed for joint transmission by configured target information Ntrp . Thus, in one possible implementation, the terminal obtains the number N of the plurality of TRPs Ntrp May include one of the following:
(1) Acquiring the number N of the plurality of TRPs configured on the network side Ntrp The method comprises the steps of carrying out a first treatment on the surface of the For example, the network side can explicitly configure the number N of TRP allowing joint transmission through configuration signaling Ntrp 。
(2) Acquiring the number N of the TRPs according to the configured target information Ntrp Wherein the target information includes one of: channel Measurement Resources (CMR), transmission Configuration Indication (TCI), higher layer configuration signaling. For example, the number N of the plurality of TRPs is determined according to the number of CMRs configured at the network side Ntrp If the network side configures N CMRs for the terminal, N Ntrp =n. Alternatively, the number N of the plurality of TRPs may be determined according to the number of TCIs configured at the network side Ntrp If the network side configures M TCIs for the terminal, N Ntrp =m. Alternatively, the number N may be obtained by higher layer configuration signaling Ntrp For example, the network side may give the number N of TRP allowing joint transmission in higher layer signaling codebook configuration information (codebook-config) Ntrp 。
In one possible implementation manner, the network side may further configure the predetermined number corresponding to each TRP. I.e. the target parameters may further comprise:
A predetermined number L of said target orthogonal beams i Wherein L is i A predetermined number of the target orthogonal beams corresponding to the TRP i; or, a predetermined total number l_total of the target orthogonal beams, where l_total is a sum of numbers of the target orthogonal beams corresponding to the plurality of TRPs.
Step 2, acquiring an oversampling factor O corresponding to TRP i according to target parameters of TRP i and according to indication or preset information of high-level signaling 1,i And O 2,i Wherein the TRP i is the value ofThe (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1}，N Ntrp Is the number of the plurality of TRPs.
Step 3, based on the obtained oversampling factor O of the TRP i 1,i And O 2,i Obtain the orthogonal beam group set corresponding to the TRP iWherein the orthogonal beam group set +.>With O therein 1,i *O 2,i Sets of orthogonal beams.
In one possible implementation manner, the network side may uniformly configure a set of target parameters for each TRP, or may configure a set of target parameters for each TRP, so as to obtain the target parameters of each TRP, including one of the following:
(1) Acquiring a set of target parameters uniformly configured for a plurality of TRPs by a network side, wherein the target parameters of the plurality of TRPs are the same; for example, the network side may uniformly configure a set of port configuration parameters N for a plurality of TRPs 1 And N 2 The port configuration parameters indicating each TRP are the same, i.e. for each TRP, the terminal adopts the port configuration parameter N 1 And N 2 A set of orthogonal beam groups is acquired. For another example, the network side may uniformly configure the predetermined number L for the plurality of TRPs, which indicates that the predetermined numbers corresponding to the TRPs are the same. Alternatively, the network side may uniformly configure a set of target parameters for a plurality of TRPs: n (N) 1 And N 2 And L, the port configuration parameters indicating the TRPs and the corresponding preset numbers are the same.
Optionally, in case of a set of the target parameters uniformly configured for all the TRPs at the network side, the port configuration parameters N due to the plurality of TRPs 1 And N 2 Are all the same, whereby each of the TRPs corresponds to an oversampling factor O 1 And O 2 The same applies, therefore, the network side can directly configure the oversampling factor O 1 And O 2 To save resources of the terminal, therefore, in one possible implementation, the target parameter may further include an oversampling factor O 1 And O 2 The oversampling factor O corresponding to TRP i 1,i ＝O 1 ，O 2,i ＝O 2 That is, each of the TRPs employs the same set of oversampling factors O 1 And O 2 Is a value of (a).
(2) Acquiring a set of target parameters configured by the network side for each TRP, wherein the set of target parameters respectively correspond to each TRP, and the target parameters configured by each TRP are not identical. For example, for TRP i in a plurality of TRPs, the network side may configure the TRP with a set of port configuration parameters N 1,i And N 2,i For TRP j (where i is not equal to j) of the plurality of TRPs, the network side may configure the TRP with a set of port configuration parameters N 1,j And N 2,j Wherein N is 1,i And N 2,i And N 1,j And N 2,j The terminal may be the same or different, and adopts port configuration parameter N for TRP i 1,i And N 2,i Acquiring an orthogonal beam group set of TRP i, and adopting a port configuration parameter N for a terminal for TRP j 1,j And N 2,j A set of orthogonal beam groups for TRP j is acquired. For another example, for TRP i of the plurality of TRPs, the predetermined number of network side configurations for the TRP is L i For TRP j of the plurality of TRPs, the predetermined number of network side configurations for the TRP is L j ，L i And L is equal to j May be the same or different.
(3) For multiple TRPs, the network side may configure a predetermined total number L_total for all TRPs, and for a predetermined number L of TRP i associations in the multiple TRPs i And the terminal determines according to the L_total.
S212, selecting a target orthogonal beam group corresponding to each TRP from the orthogonal beam group set corresponding to each TRP according to the channel information of each TRP, and selecting a preset number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group.
In the embodiment of the application, the terminal can select the target orthogonal beam group corresponding to each TRP from the orthogonal beam group set corresponding to each TRP according to the channel information of each TRP, and select a preset number of target orthogonal beams from the target orthogonal beam group.
The channel information of each TRP may be obtained by measuring a channel reference signal of each TRP by the terminal, and the terminal may select a corresponding target orthogonal beam group and a predetermined number of target orthogonal beams in the target orthogonal beam group according to the measurement result.
In one possible implementation, S212 may include:
step 1, acquiring an orthogonal beam group sequence number q of TRP i according to channel information of the TRP i 1,i And q 2,i Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1}，N Ntrp A number of the plurality of TRPs;
step 2, according to q 1,i And q 1,i Determining the orthogonal beam group set corresponding to the TRP iWherein 0.ltoreq.q 1,i ≤O 1,i And 0.ltoreq.q 2,i ≤O 2,i The target orthogonal beam group comprises N 1,i *N 2,i The orthogonal beams;
step 3, obtaining L corresponding to the TRP i from the target orthogonal beam group by utilizing the channel information of the TRP i i A target orthogonal beam, L i A predetermined number corresponding to the TRP i.
S214, determining a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back the target orthogonal beams of the preset number in each target orthogonal beam group; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups.
In the embodiment of the present application, feedback overhead of spatial parameters in the PMI may be reduced by indicating the target orthogonal beam groups corresponding to the plurality of TRPs by the first combination number and/or indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups by the second combination number.
In one possible implementation, before the first feedback parameter and the second feedback parameter are acquired, the sequence number of the target orthogonal beam group corresponding to each TRP and the sequence number of the target orthogonal beam corresponding to each TRP may be globally numbered. Thus, prior to S214, the method may further comprise the steps of:
step 1, global numbering is carried out on the sequence numbers of the target orthogonal beam groups corresponding to the TRPs, and target orthogonal beam group information corresponding to a plurality of the TRPs is obtained.
For example, taking any TRP i as an example, the sequence numbers of the target orthogonal beam groups corresponding to the TRPs may be globally numbered in any of the following manners:
(1) Sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered q 1 ＝(i*O 1,i )+q 1,i ,q 2 ＝q 2,i ；
(2) Sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered q 2 ＝(i*O 2,i )+q 2,i ,q 1 ＝q 1,i 。
(3) Sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered as
(4) Sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered as
Wherein O is 1,k ,O 2,k An oversampling factor representing TRP k among a plurality of said TRPs.
Step 2, each corresponding L of the TRP i Globally numbering the identification information of the target orthogonal beams to obtain serial numbers of the target orthogonal beams corresponding to the TRPs, wherein the identification information is the identification information of the target orthogonal beams in the target orthogonal beam group, and the identification information comprises a parameter m i And l i ，m i And l i Is an integer and 0.ltoreq.m i ≤N 2,i And 0.ltoreq.l i ≤N 1,i 。
Alternatively, m i May be the line number of the target orthogonal beam in the target orthogonal beam group, l i May be the column number of the target orthogonal beam in the target orthogonal beam set.
For example, taking any TRP i as an example, the target orthogonal beam information corresponding to each TRP may be globally numbered in any of the following manners:
(1) L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam: m= (i x N) 2 )+m i ,l＝l i ；
(2) L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam: m=m i ,l＝(i*N 1 )+l i ；
(3) L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam:
(4) L of the TRP i i Individual target orthogonal wavesNumbering the identification information of one target orthogonal beam in the beams to obtain the serial number of the target orthogonal beam:
wherein N is 1,k ,N 2,k Port configuration parameters representing TRP k.
In one possible implementation, determining the first combination count indicating a target orthogonal beam group corresponding to a plurality of the TRPs may include:
mapping the sequence number of the target orthogonal beam group corresponding to each TRP into a first combination number i 1,1 Wherein i is 1,1 For indicating N in orthogonal vector group corresponding to the TRP trp Number of individual vector groupWherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1}，N Ntrp For the number of TRPs, O 1,i O 2,i To obtain the oversampling factor of TRP i, N trp Representing the number of a plurality of said TRPs, < >>Representing from->N selected from the orthogonal beam groups trp The number of combinations corresponding to each target orthogonal beam group.
In one possible implementation, the first combined number i 1,1 The mapping relation of the sequence numbers of the target orthogonal beam groups corresponding to the TRPs may include:
Wherein (1)>Or (F)>n i For the global sequence number of the ith target orthogonal beam group, i is more than or equal to 0 and less than or equal to N trp -1；/>Sequence number q representing the target beam group corresponding to the ith TRP 2 ，/>A sequence number q representing the target beam group corresponding to the TRP i 1 Wherein, the method comprises the steps of, wherein,q is 0.ltoreq.q 2 ≤O 2 Or 0.ltoreq.q 1 ≤O 1 And +.>
Optionally, if the port configuration parameters of each TRP are the same, the value of the oversampling factor corresponding to each TRP is the same, and is assumed to be O 1 And O 2 Mapping the sequence number of the target orthogonal beam group corresponding to each TRP into a first combination number i 1,1 Wherein i is 1,1 For indicating N in the orthogonal beam group corresponding to the TRP trp The sequence numbers of the sets of orthogonal beams,wherein O is 1 And O 2 Is a sampling factor, N trp Represents the number of a plurality of the TRPs,represents the slave O 1 *O 2 *N trp N selected from the orthogonal beam groups trp The number of combinations corresponding to each target orthogonal beam group. And a first combined number i 1,1 The mapping relation of the sequence numbers of the target orthogonal beam groups corresponding to the TRPs can comprise：
Wherein (1)>Or alternatively, the process may be performed,n i for the global sequence number of the ith target orthogonal beam group, i is more than or equal to 0 and less than or equal to N trp -1；/>Sequence number q representing the target beam group corresponding to the ith TRP 2 ，/>Sequence number q representing the target beam group corresponding to the ith TRP 1 Wherein 0.ltoreq.q 1 ≤O 1 *N trp Q is 0.ltoreq.q 2 ≤O 2 Or 0.ltoreq.q 1 ≤O 1 Q is 0.ltoreq.q 2 ≤O 2 *N trp 。
In one possible implementation, determining the second combined number indicative of the predetermined number of target orthogonal beams in each of the target orthogonal beam groups may include:
mapping the serial numbers of the target orthogonal beams corresponding to the TRPs into a second combination number i 1,2 Wherein i is 1,2 For indicating that all target orthogonal beam groups indicated by the first combination number are withinSequence numbers of orthogonal beams, L i Is said predetermined number of TRP i.
Alternatively, the process may be carried out in a single-stage,wherein N is 1,i And N 2,i For the network side to be the TThe number of antenna ports that RPi configures in two dimensions of the same polarization, +.>Representing slaveSelect +.>Number of combinations of the individual target orthogonal beams.
Alternatively, i 1,2 And (3) withThe mapping relation of the sequence numbers of the target orthogonal beams comprises the following steps:
wherein (1)>Or (F)>Wherein n is i Global sequence number for the ith target orthogonal beam, for example> Sequence number m representing the ith target orthogonal beam i (the sequence number may be the sequence number m of the ith target orthogonal wave after the global numbering,>sequence number l representing the ith target orthogonal beam i (the sequence number may be the sequence number l obtained by the global number of the ith target orthogonal wave), wherein 0 ≤m i ≤N 2 Andor->0.ltoreq.l i ≤N 1 。
In one possible implementation, if the port configuration parameters of each TRP are the same, the value of the oversampling factor corresponding to each TRP is also the same, and is assumed to be O 1 And O 2 And, a predetermined number L corresponding to each TRP i Also the same, determining a second number of combinations indicative of the predetermined number of target orthogonal beams in each of the target orthogonal beam groups may include: mapping the serial numbers of the target orthogonal beams corresponding to the TRPs into a second combination number i 1,2 Wherein i is 1,2 N within all target orthogonal beam groups for indicating the first combined number indication trp * And the sequence numbers of the L orthogonal beams, wherein L is the preset number.
Wherein, the liquid crystal display device comprises a liquid crystal display device,wherein N is 1 And N 2 For the number of antenna ports configured by the network side in two dimensions of the same polarization for the TRP, and (2)>Representing the slave N 1 *N 2 *N trp Selecting L x N from orthogonal beams trp Number of combinations of the individual target orthogonal beams.
And i 1,2 And L is N trp The mapping relation of the sequence numbers of the target orthogonal beams may include:
wherein, the liquid crystal display device comprises a liquid crystal display device,or (F)>Wherein n is i For the global sequence number of the ith target orthogonal beam, i is more than or equal to 0 and less than or equal to L and N trp -1，/>Sequence number m, representing the ith target orthogonal beam >A sequence number l representing the ith target orthogonal beam, wherein m is more than or equal to 0 and less than or equal to N 2 L is more than or equal to 0 and less than or equal to N 1 *N trp Or 0.ltoreq.m.ltoreq.N 2 *N trp L is more than or equal to 0 and less than or equal to N 1 。
S216, the terminal sends a PMI parameter, wherein the PMI parameter comprises the first feedback parameter and the second feedback parameter.
In the embodiment of the application, the terminal can send the PMI parameter through a multi-TRP channel state information (Channel State Information, CSI) report, and the network side can acquire the PMI fed back by the terminal according to the received PMI parameter.
In one possible implementation, before S216, the method may further include:
step 1, acquiring configuration parameters of a network side, and acquiring the corresponding time delay information quantity of each TRP. In the step, the corresponding time delay information quantity of each TRP is obtained according to the configuration parameters of the network side.
And 2, acquiring the time delay information of the TRPs according to the time delay information quantity corresponding to each TRP, wherein the PMI parameter also comprises the time delay information of the TRPs. In this step, the terminal may determine the number of delay information to be acquired according to the number of delay information corresponding to each TRP, and acquire the corresponding number of delay information.
In one possible implementation manner, if the amount of delay information corresponding to each TRP is different, the delay information of the plurality of TRPs may be obtained according to the maximum amount of delay information in the plurality of TRPs.
For example, the terminal may acquire network configuration parameters and calculate the amount of feedback delay information of the terminal, where the amount may be the same or different for each TRP; and the terminal acquires the time delay information of the plurality of TRPs according to the time delay information quantity, wherein the time delay information is represented by a DFT vector or other vectors. Optionally, when the number of delay information acquired by the terminal is different for each TRP, the terminal acquires delay information of a plurality of TRPs according to the maximum value.
In one possible implementation manner, the terminal may further obtain a feedback coefficient of the coefficient matrix for feeding back the PMI, and the PMI parameter may further include the feedback coefficient.
Alternatively, the terminal may set the amplitude of the TRP corresponding to the strongest coefficient in the coefficient matrix as a reference value, and acquire the amplitude quantization coefficient between the TRPs by quantizing the amplitude of the strongest coefficient of other TRPs in the plurality of TRPs based on the reference value.
For example, the terminal assumes that the amplitude of the TRP corresponding to the strongest coefficient is 1, quantizes the amplitude of the strongest coefficient of other TRPs based on the strongest coefficient, and feeds back the corresponding TRP amplitude quantized coefficient. For example, use i 2,6,v For layer (layer) vN trp The quantization indication of the amplitude coefficient of the strongest coefficient of each TRP is that each amplitude coefficient is a 4-bit string, 16 quantization levels can be indicated, and each codepoint corresponds to a quantization value, wherein the amplitude coefficient of the polarization where the strongest coefficient is located is not fed back and is assumed to be 1.
In one possible implementation manner, when the terminal sends the PMI parameter, the PMI parameter may be mapped to channel state information CSI for sending, where an amplitude quantization coefficient between the TRPs is mapped on a second part of CSI, located before a polarization amplitude indication in the PMI parameter, or located between the polarization amplitude indication and a window indication in the PMI parameter.
For example, the terminal maps amplitude quantization coefficients between TRPs in Group2 of CSIPart2 for feedback, with the mapping order at the polesIndication of chemical amplitude i 2,3,v Before, or polarization amplitude indicates i 2,3,v Window indication i 1,5 Between them.
According to the technical scheme provided by the embodiment of the application, for the joint transmission scheme of a plurality of TRPs, if the space domain beam of each TRP needs to be fed back, the feedback overhead can be reduced by using the number of combinations to carry out global sequence number feedback, and in addition, the quantization precision can be further improved by feeding back the amplitude among the TRPs, thereby being beneficial to the improvement of the precoding performance.
Fig. 3 is a flowchart of a PMI acquisition method for multi-TRP transmission according to an embodiment of the present application, where the method 300 may be performed by a network side device. In other words, the method may be performed by software or hardware installed on the network-side device. As shown in fig. 3, the method mainly includes the following steps.
S310, the network side device indicates to the terminal the target parameters of the plurality of TPRs that allow the joint transmission.
Wherein the target parameter is the same as the target parameter in the method 200, see in particular the description in the method 200.
Optionally, the target parameters include:
(1) Port configuration parameter N 1,i And N 2,i Wherein N is 1,i And N 2,i The number of the antenna ports configured for TRP i on the network side in two dimensions of the same polarization is respectively; or alternatively, the process may be performed,
(2) The port configuration parameter N 1,i And N 2,i And the number N of the plurality of TRPs Ntrp ；
Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1}。
In one possible implementation, the target parameters may further include: predetermined number L of target orthogonal beams i Wherein L is i Is a predetermined number of the target orthogonal beams corresponding to the TRP i.
In one possible implementation, the target parameters may further include: and a predetermined total number L_total of target orthogonal beams, wherein L_total is the sum of the numbers of the target orthogonal beams corresponding to the TRPs.
In one possible implementation, the network side device indicates the number N of the plurality of TRPs to a terminal Ntrp Comprising:
(1) The network side equipment configures the number N of the TRPs for the terminal Ntrp The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively, the process may be performed,
(2) The network side equipment indicates the number N of the TRPs according to the configured target information Ntrp Wherein the target information includes one of: CMR, TCI, higher layer configuration signaling.
In one possible implementation manner, the indicating, by the network side device, to the terminal, a target parameter of multiple TPRs that allow joint transmission includes:
the network side equipment uniformly configures a set of target parameters for the TRPs, and indicates that the target parameters of the TRPs are the same; or alternatively, the process may be performed,
the network side equipment configures a set of target parameters for each TRP respectively and indicates a set of target parameters corresponding to each TRP respectively, wherein the target parameters configured for each TRP are not identical.
S312, receiving PMI parameters sent by the terminal, wherein the PMI parameters comprise a first feedback parameter and a second feedback parameter; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups.
The terminal may send the PMI parameter in the manner described in the method 200, and specifically, reference may be made to the description in the method 200, which is not repeated herein.
S314, the network side equipment acquires PMIs of the TRPs according to the PMI parameters.
For example, the network obtains a corresponding orthogonal beam group sequence number according to a first feedback parameter fed back, if the first feedback parameter is a combination number, the corresponding orthogonal beam group sequence number is needed to be obtained by demapping according to a mapping formula from the sequence number to the combination number, then the orthogonal beam sequence number is obtained by demapping according to a second feedback parameter fed back, a Spatial Domain (SD) matrix of the PMI is obtained by using a predefined formula according to the orthogonal beam group sequence number and the orthogonal beam sequence number, and then the PMI of the plurality of TRPs described by the user is obtained by multiplying Frequency Domain (FD) matrix information fed back by the UE and coefficient matrix information or by the predefined formula.
According to the technical scheme provided by the embodiment of the application, under the scene of multi-TRP joint transmission, the network side equipment can acquire the PMI of each TRP according to the PMI parameter fed back by the terminal, so that the system performance is improved.
Fig. 4 is a schematic flow chart of another feedback method of PMI for multi-TRP transmission according to the embodiment of the present application, and as shown in fig. 4, the method 400 mainly includes the following steps.
S410, obtaining PMI parameters.
S412, feeding back PMI parameters.
Alternatively, acquiring the PMI parameter may include: and acquiring a Spatial Domain (SD) parameter.
Optionally, obtaining the airspace parameter may include:
and step 1, acquiring orthogonal beam group information.
And 2, acquiring beam information according to the orthogonal beam group information.
The method comprises the following steps of:
(1) Orthogonal beam group information of each TRP allowing JT transmission is acquired separately. The TRP allowing the JT transmission may be one of the TRPs selected by the terminal to perform the JT transmission CSI feedback, or one of the TRPs indicated by the network side through the higher layer signaling to perform the JT transmission CSI feedback.
Alternatively, orthogonal beam group information for each TRP allowing JT transmission may be acquired by:
for any TRP, the port configuration parameter N of the TRP is firstly obtained according to the high-layer signaling 1 And N 2 Wherein N is 1 And N 2 The number of antenna ports in two dimensions (for example: horizontal dimension and vertical dimension) of TRP in the same polarization can be expressed respectively, and the beam over-sampling factor O in two dimensions is determined according to the number of ports in two dimensions 1 And O 2 Then the channel of the TRP is utilized to obtain the sequence number 0 q or less of the orthogonal beam group 1 ≤O 1 And 0.ltoreq.q 2 ≤O 2 According to q 1 And q 1 Determining a set of orthogonal beam groupsIn (2), wherein the set of orthogonal beam groups +.>With O therein 1 *O 2 Sets of orthogonal beams. The orthogonal beams may be column vectors of a DFT matrix or other vectors.
In summary, orthogonal beam group information may be obtained, including N trp Orthogonal group number q corresponding to TRP 1 And q 2 。
(2) Orthogonal beam information of each TRP allowing JT transmission is acquired separately.
Alternatively, orthogonal beam information of TRP of each allowed JT transmission may be acquired by:
for any TRP, according to q 1 And q 2 Determining a set of orthogonal beam groupsIn (2), wherein the set of orthogonal beam groups +.>With O therein 1 *O 2 A plurality of orthogonal beam groups, wherein the orthogonal beam groups comprise N 1 *N 2 The method comprises the steps of obtaining a designated number L of orthogonal beam indication information by using a channel of the TRP, wherein each indication information comprises m is more than or equal to 0 and less than or equal to N 2 And 0.ltoreq.l.ltoreq.N 1 Wherein L passes network higher layer signalingAnd (5) obtaining.
In summary, orthogonal beam information may be obtained, including N trp N of TRP trp * L orthogonal beam indication information, where N trp Indicating the number of TRPs that allow JT transmission.
(3) Orthogonal beam group information for each TRP that allows JT transmission is jointly acquired.
Alternatively, orthogonal beam group information for each TRP allowing JT transmission may be jointly acquired by:
firstly, acquiring port and TRP quantity configuration parameter N according to high-level signaling 1 、N 2 、N trp For either TRP, where N1 and N2 can represent the number of antenna ports in two dimensions (e.g., horizontal and vertical dimensions) of the TRP on the same polarization, respectively, based on the number of ports in both dimensions and N trp Determining two-dimensional beam over-acquisition factor O 1 And O 2 Then, a plurality of orthogonal beam group sets are determined according to port configurations and over-sampling factors of all TRPsWherein i is {0,1, …, N trp -1}，N trp Representing the number of TRPs that allow JT transmission, then using the channel of TRpi from the orthogonal beam set +.>Acquiring beam orthogonal group sequence number q 1_i And q 2_i ，i∈{0,1,…,N trp 0.ltoreq.q 1_i ≤O 1 And 0.ltoreq.q 2_i ≤O 2 . Then, the orthogonal group numbers of all TRPs are globally numbered.
For example, the beam orthogonal group sequence number q of TRpi can be 1_i And q 2_i Numbered q 1 ＝(i*O 1 )+q 1_i ,q 2 ＝q 2_i The method comprises the steps of carrying out a first treatment on the surface of the Alternatively, beam orthogonal group sequence number q of TRpi 1_i And q 2_i Numbered q 2 ＝(i*O 2 )+q 2_i ,q 1 ＝q 1_i Etc.
The resulting orthogonal beam group information includes N trp Orthogonal group number q corresponding to TRP 1 And q 2 。
(4) Orthogonal beam information for each TRP that allows JT transmission is jointly acquired.
Alternatively, orthogonal beam information of TRP of each allowed JT transmission may be jointly acquired by:
q according to TRP i for all TRPs 1 And q 2 Determining a group of orthogonal beams G i Where i ε {0,1, …, N trp -1}, wherein the orthogonal beam group comprises N 1 *N 2 For orthogonal beams, for orthogonal beam group G i Acquiring a specified number L of orthogonal beam indication information by using the associated TRPI channel, wherein each indication information comprises 0.ltoreq.m i ≤N 2 And 0.ltoreq.l i ≤N 1 Where L is acquired through network higher layer signaling. The orthogonal beam indication information of all TRPs is then globally numbered.
For example, one beam indication information among L orthogonal beam indication information associated with TRPi is numbered as: m= (i x N) 2 )+m i ,l＝l i The method comprises the steps of carrying out a first treatment on the surface of the Alternatively, one beam indication information of L orthogonal beam indication information associated with TRPi is numbered as: m=m i ,l＝(i*N 1 )+l i Etc.
In summary, the resulting orthogonal beam information includes N trp N of TRP trp * L orthogonal beam indication information (m, L), where N trp Indicating the number of TRPs that allow JT transmission.
In one possible implementation, when acquiring beam information according to the network indication based on the orthogonal beam groups, the network indicates that the number of beams of each TRP is not identical, i.e. the L value corresponding to each TRP is not identical; alternatively, the network indicates that the number of beams per TRP is the same, i.e. the L value corresponding to each TRP is the same.
In one possible implementation, the feedback PMI parameter may include: the SD (spatial domain) parameter is fed back.
Alternatively, the feedback SD parameters may include:
step 1, feeding back orthogonal beam group information;
and 2, feeding back orthogonal beam information.
Optionally, feeding back the orthogonal beam group information may include: orthogonal beam group information for each TRP is fed back separately.
For example, by parameter i 1,1,t Feedback, where t=0, 1, …, N trp -1, wherein t, t = 0 is associated to a first measurement signal resource port group/measurement signal resource group/TRP, t = 1 is associated to a second measurement signal resource port group/measurement signal resource group/TRP, and so on. For parameter i 1,1,t Comprising q 1 And q 2 Wherein 0.ltoreq.q 1 ≤O 1 And 0.ltoreq.q 2 ≤O 2 . The network is based on parameter i 1,1,t Acquisition of N trp Q 1 And q 2 Each TRP is determined separately in a predefined order, and the terminal selects the set of orthogonal beams.
Alternatively, the orthogonal beam group information of all the TRPs is fed back using the combined number. For example, orthogonal beam group information of all TRPs is mapped to a combination number.
For example, by parameter i 1,1 Feedback, where i 1,1 For indicating N in all orthogonal vector groups trp The number of the group of vectors, Wherein O is 1 ,O 2 For beam oversampling parameters, N trp Indicating the number of TRPs that allow JT transmission. />Represents the slave O 1 O 2 N trp Selecting N from orthogonal groups trp The number of combinations corresponding to the orthogonal beam groups. i.e 1,1 And N trp The mapping of the sequence numbers of the orthogonal beam groups is as follows
Or alternatively
Wherein n is i Global sequence number for a beam group, consisting of sequence numbersAnd->And (5) determining. n is n i The value of (2) increases with the increase of i, i is more than or equal to 0 and N is more than or equal to N trp -1。/>Representing the beam group number q corresponding to the ith TRP 2 ，/>Representing the beam group number q corresponding to the ith TRP 1 Wherein 0.ltoreq.q 1 ≤O 1 N trp And 0.ltoreq.q 2 ≤O 2 Or 0.ltoreq.q 1 ≤O 1 And 0.ltoreq.q 2 ≤O 2 N trp 。
The network is based on the combination number i 1,1 Demapping to obtain N trp Number q of beam group 1 And q 2 Acquiring N selected by a terminal trp Sets of orthogonal beams.
Alternatively, feeding back the orthogonal beam information may include: the orthogonal beam information of each TRP is fed back by using the combination numbers, respectively.
For example, by parameter i 1,2,t Feedback, where t=0, 1, …, N trp -1, wherein t, t=0 is associated to the first measurement signal resource port group/measurement signal resource group/TRP, t=1 is associated to the first measurement signal resource port group/measurement signal resource group/TRPTwo measurement signal resource port groups/measurement signal resources/measurement signal resource groups/TRP, and so on. i.e 1,2,t For indicating i 1,1,t The L vector numbers within the indicated orthogonal beam group,wherein N is 1 N 2 Port number parameter configured for network, L is the number of beams indicated for network, +. >Representing the slave N 1 *N 2 The number of combinations of L beams is selected from the plurality of beams. i.e 1,2,t The mapping with the L orthogonal beam numbers is:
wherein n is i Global sequence number for one beam, by sequence numberAnd->And (5) determining. n is n i The value of (1) increases with increasing i, 0<＝i<＝L-1。/>Representing beam number m, etc>Representing beam number l, 0<＝m<＝N 2 And 0 (0)<＝l<＝N 1 。
The network is based on the combination number i 1,2,t Demapping to obtain N trp * L m and L, obtaining terminalSelected N trp * L orthogonal beams.
Alternatively, the orthogonal beam information of all TRPs may be fed back using the combined number. For example, orthogonal beam information of all TRPs is mapped to a combination number.
For example, by parameter i 1,2 Feedback, where i 1,2 For indicating i 1,1,t Or i 1,1 N within all orthogonal beam groups indicated trp * The number of L orthogonal vector numbers,wherein N is 1 N 2 Port number parameter configured for network, L is the number of beams indicated for network, +.>Representing the slave N 1 *N 2 *N trp Selection of L.times.N in individual beams trp Number of combinations of individual beams. i.e 1,2 And L is N trp The mapping of the individual orthogonal beam numbers is as follows:
or alternatively
Wherein n is i Global sequence number for an orthogonal beam, consisting of sequence numbersAnd->And (5) determining. n is n i The value of (2) increases with increasing iAdding, i is more than or equal to 0 and less than or equal to L and N trp -1。/>Beam group number m, representing the corresponding i-th orthogonal beam>Representing the beam group serial number l corresponding to the ith orthogonal beam, wherein m is more than or equal to 0 and less than or equal to N 2 And 0.ltoreq.l.ltoreq.N 1 *N trp Or 0.ltoreq.m.ltoreq.N 2 *N trp And 0.ltoreq.l.ltoreq.N 1 。
The network is based on the combination number i 1,2 Demapping to obtain N trp * L are m and L, N selected by the terminal is obtained trp * L orthogonal beams.
In one possible implementation, acquiring the PMI parameter may also acquire a frequency domain or Delay domain (frequency domain) parameter.
Alternatively, acquiring the frequency domain or the time delay domain may include:
step 1, acquiring network configuration parameters, and calculating the feedback delay information quantity of a terminal;
alternatively, the number may be the same for each TRP, or the number may not be exactly the same for each TRP.
And 2, the terminal acquires time delay information of a plurality of TRPs according to the time delay information quantity, wherein the time delay information is represented by DFT vectors or other vectors.
Optionally, when the number of delay information acquired by the terminal is different for each TRP, the terminal acquires delay information of a plurality of TRPs according to the maximum value.
In one possible implementation, the feedback PMI parameter may further include: and feeding back coefficient matrixes corresponding to the time delay domain and the space domain.
Optionally, the coefficient matrix corresponding to the feedback delay domain and the spatial domain may include:
step 1, a terminal supposes that the amplitude of a TRP corresponding to a strongest coefficient is 1, quantizes the amplitude of the strongest coefficient of other TRPs based on the strongest coefficient, and feeds back the corresponding TRP amplitude quantized coefficient.
For example: using i 2,6,v For layer vN trp The quantization indication of the amplitude coefficient of the strongest coefficient of each TRP is that each amplitude coefficient is a 4-bit string, 16 quantization levels can be indicated, and each codepoint corresponds to a quantization value, wherein the amplitude coefficient of the polarization where the strongest coefficient is located is not fed back and is assumed to be 1.
Step 2, the terminal maps the amplitude quantization coefficients among TRPs in the Group2 of CSIPart2 for feedback, and the mapping sequence is positioned in the polarization amplitude indication i 2,3,v Before, or polarization amplitude indicates i 2,3,v Window indication i 1,5 Between them.
By the method, for the joint transmission scheme of a plurality of TRPs, if the space beam of each TRP needs to be fed back, the feedback overhead can be reduced by using the combination number to perform global sequence number feedback, and in addition, the quantization precision can be further improved by feeding back the amplitude among the TRPs, thereby being beneficial to the improvement of the precoding performance.
According to the feedback method of the PMI transmitted by the multiple TRPs, the execution body can be the feedback device of the PMI transmitted by the multiple TRPs. In the embodiment of the present application, a feedback method of a PMI transmitted by multiple TRPs is taken as an example, and the feedback device of the PMI transmitted by multiple TRPs provided in the embodiment of the present application is described.
Fig. 5 shows a schematic structural diagram of a feedback device for PMI transmitted by multiple TRPs according to an embodiment of the present application, and as shown in fig. 5, the device 500 mainly includes: a first determining module 501, a selecting module 502, a second determining module 503 and a first transmitting module 504.
In the embodiment of the present application, a first determining module 501 is configured to determine, according to a target parameter configured by a network side for a plurality of TRPs that allow joint transmission, an orthogonal beam group set corresponding to each TRP; a selecting module 502, configured to select, according to channel information of each TRP, a target orthogonal beam group corresponding to the TRP from the orthogonal beam group sets corresponding to each TRP, and select a predetermined number of target orthogonal beams corresponding to each TRP from the target orthogonal beam groups; a second determining module 503, configured to determine a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; a first sending module 504, configured to send a PMI parameter, where the PMI parameter includes the first feedback parameter and the second feedback parameter.
In one possible implementation manner, the first determining module 501 determines, according to a target parameter configured by a network side for a plurality of TRPs, a set of orthogonal beam groups corresponding to the TRPs, including:
acquiring target parameters of each TRP;
acquiring an oversampling factor O corresponding to TRP i according to target parameters of TRP i and according to indication or preset information of high-level signaling 1,i And O 2,i Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1，NN trp A number of the plurality of TRPs;
based on the obtained oversampling factor O of the TRP i 1,i And O 2,i Obtain the orthogonal beam group set corresponding to the TRP iWherein the orthogonal beam group set +.>With O therein 1,i *O 2,i Sets of orthogonal beams. />
In one possible implementation, the target parameters include:
port configuration parameter N 1,i And N 2,i Wherein N is 1,i And N 2,i The number of the antenna ports configured for the TRP i in two dimensions of the same polarization at the network side is respectively; or alternatively, the process may be performed,
the port configuration parameter N 1,i And N 2,i And the number N of the plurality of TRPs Ntrp 。
In one possible implementation, the target parameters further include:
a predetermined number L of said target orthogonal beams i Wherein L is i A predetermined number of the target orthogonal beams corresponding to the TRP i; or, a predetermined total number l_total of the target orthogonal beams, where l_total is a sum of numbers of the target orthogonal beams corresponding to the plurality of TRPs.
In one possible implementation, the first determining module 501 obtains the number N of the plurality of TRPs Ntrp Comprising:
according to the number N of the plurality of TRPs configured on the acquisition network side Ntrp The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively, the process may be performed,
acquiring the number N of the TRPs according to the configured target information Ntrp Wherein the target information includes one of: channel measurement resources CMR, transmission configuration indication TCI, higher layer configuration signaling.
In one possible implementation, the first determining module 501 obtains the target parameter of each TRP, including:
acquiring a set of target parameters uniformly configured for a plurality of TRPs by a network side, wherein the target parameters indicate that the plurality of TRPs are the same; or alternatively, the process may be performed,
and respectively acquiring a set of target parameters configured by the network side for each TRP, and indicating a set of target parameters respectively corresponding to each TRP, wherein the target parameters configured by the network side for each TRP are not completely the same.
In one possible implementation manner, in a case that the network side configures a set of the target parameters for each TRP in a unified manner, the target parameters further include: oversampling factor O 1 And O 2 The oversampling factor O corresponding to TRP i 1,i ＝O 1 ，O 2,i ＝O 2 。
In one possible implementation manner, the selecting module 502 selects, according to channel information of each TRP, a target orthogonal beam group corresponding to the TRP from the orthogonal beam group set corresponding to each TRP, and selects a predetermined number of target orthogonal beams corresponding to each TRP from the target orthogonal beam groups, including:
acquiring orthogonal beam group sequence number q of TRP i according to channel information of TRP i 1,i And q 2,i Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1}，N Ntrp A number of the plurality of TRPs;
according to q 1,i And q 1,i Determining the orthogonal beam group set corresponding to the TRP iWherein 0.ltoreq.q 1,i ≤O 1,i And 0.ltoreq.q 2,i ≤O 2,i The target orthogonal beam group comprises N 1,i *N 2,i The orthogonal beams;
acquiring L corresponding to the TRP i from the target orthogonal beam group by utilizing the channel information of the TRP i i A target orthogonal beam, L i A predetermined number corresponding to the TRP i.
In one possible implementation, the second determining module is further configured to:
global numbering is carried out on the sequence numbers of the target orthogonal beam groups corresponding to the TRPs, so that a plurality of target orthogonal beam group information corresponding to the TRPs is obtained;
L corresponding to each TRP i Globally numbering the identification information of the target orthogonal beams to obtain serial numbers of the target orthogonal beams corresponding to the TRPs, wherein the identification information is the identification information of the target orthogonal beams in the target orthogonal beam group, and the identification information comprises a parameter m i And l i ，m i And l i Is an integer and 0.ltoreq.m i ≤N 2,i And 0.ltoreq.l i ≤N 1,i 。
In one possible implementation manner, global numbering is performed on sequence numbers of the target orthogonal beam groups corresponding to the TRP, including one of the following:
sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered q 1 ＝(i*O 1,i )+q 1,i ,q 2 ＝q 2,i ；
Sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered q 2 ＝(i*O 2,i )+q 2,i ,q 1 ＝q 1,i ；
Sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered as
Sequence number q of beam orthogonal group of TRP i 1,i And q 2,i Respectively numbered as
Wherein O is 1,k ,O 2,k An oversampling factor representing TRP k among a plurality of said TRPs.
In one possible implementation, for each of the TRPs, a corresponding L i The identification information of each target orthogonal beam is globally numbered, including one of the following:
l of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam: m= (i x N) 2 )+m i ,l＝l i ；
L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam: m=m i ,l＝(i*N 1 )+l i ；
L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam：
L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam:
wherein N is 1,k ,N 2,k Port configuration parameters representing TRP k.
In one possible implementation, the second determining module 503 determines the first combination number indicating the target orthogonal beam groups corresponding to the TRPs, including:
mapping the sequence number of the target orthogonal beam group corresponding to each TRP into a first combination number i 1,1 Wherein i is 1,1 For indicating N in orthogonal vector group corresponding to the TRP trp Number of individual vector groupWherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1}，N Ntrp For the number of TRPs, O 1,i O 2,i To obtain the oversampling factor of TRP i, N trp Representing the number of a plurality of said TRPs, < >>Representing from->N selected from the orthogonal beam groups trp The number of combinations corresponding to each target orthogonal beam group.
In one possible implementation, the first combination number i 1,1 The mapping relation of the sequence numbers of the target orthogonal beam groups corresponding to the TRPs comprises the following steps:
wherein (1)>Or (F)>n i For the global sequence number of the ith target orthogonal beam group, i is more than or equal to 0 and less than or equal to N trp -1；/>Sequence number q representing the target beam group corresponding to the ith TRP 2 ，/>A sequence number q representing the target beam group corresponding to the TRP i 1 Wherein->Q is 0.ltoreq.q 2 ≤O 2 Or 0.ltoreq.q 1 ≤O 1 And +.>
In one possible implementation, the second determining module 503 determines the second combined number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups, including:
mapping the serial numbers of the target orthogonal beams corresponding to the TRPs into a second combination number i 1,2 Wherein i is 1,2 For indicating that all target orthogonal beam groups indicated by the first combination number are withinSequence numbers of the target orthogonal beams, L i A predetermined number of said target orthogonal beams being TRP i.
In one possible implementation of the present invention,wherein N is 1,i And N 2,i For the number of antenna ports configured by the network side in two dimensions of the same polarization for the TRPi,representing from->Select +.>Number of combinations of the individual target orthogonal beams.
In one possible implementation, i 1,2 And (3) withThe mapping relation of the sequence numbers of the target orthogonal beams comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device,or (F)>Wherein n is i Global sequence number for the ith target orthogonal beam, for example> Representing the i-th target orthogonal beam sequence number m i ，/>Sequence number l representing the ith target orthogonal beam i Wherein 0.ltoreq.m i ≤N 2 And +.>Or->0.ltoreq.l i ≤N 1 。
In one possible implementation manner, the second determining module 503 is further configured to:
acquiring configuration parameters of a network side, and acquiring the time delay information quantity corresponding to each TRP;
and acquiring the time delay information of the plurality of TRPs according to the time delay information quantity corresponding to each TRP, wherein the PMI parameter also comprises the time delay information of the plurality of TRPs.
In one possible implementation, the amount of delay information is different for different TRPs.
In one possible implementation manner, obtaining the delay information of the plurality of TRPs according to the delay information quantity includes: and acquiring the time delay information of the plurality of TRPs according to the maximum time delay information quantity in the plurality of TRPs.
In one possible implementation, the second determining module 503 is further configured to:
and obtaining feedback coefficients of a coefficient matrix for feeding back the PMI, wherein the PMI parameters further comprise the feedback coefficients.
In one possible implementation manner, the second determining module 503 obtains feedback coefficients of the coefficient matrix for feeding back the PMI includes:
setting the amplitude of the TRP corresponding to the strongest coefficient in the coefficient matrix as a reference value, and obtaining amplitude quantization coefficients among the TRPs by quantizing the amplitude of the strongest coefficient of other TRPs in the plurality of TRPs based on the reference value.
In one possible implementation, the first sending module 504 sends the PMI parameter, including: mapping the PMI parameters into the CSI for transmission, wherein amplitude quantization coefficients among the TRPs are mapped in a second part of the CSI, and are positioned before polarization amplitude indication in the PMI parameters or are positioned between the polarization amplitude indication and window indication in the PMI parameters.
The feedback device of the PMI transmitted by the multiple TRPs in the embodiment of the present application may be an electronic device, for example, an electronic device with an operating system, or may be a component in the electronic device, for example, an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices than a terminal. By way of example, terminals may include, but are not limited to, the types of terminals 11 listed above, other devices may be servers, network attached storage (Network Attached Storage, NAS), etc., and embodiments of the application are not specifically limited.
The feedback device for the PMI transmitted by the multiple TRPs provided in the embodiment of the present application can implement each process implemented by the terminal in the method embodiments of fig. 2 to fig. 4, and achieve the same technical effects, and in order to avoid repetition, a detailed description is omitted here.
Fig. 6 is a schematic structural diagram of a PMI acquisition apparatus for multi-TRP transmission according to an embodiment of the present application, and as shown in fig. 6, the apparatus 600 mainly includes: a second sending module 601, a receiving module 602 and an obtaining module 603.
In the embodiment of the present application, the second sending module 601 is configured to indicate, to the terminal, a target parameter of a plurality of TPRs that allow joint transmission; a receiving module 602, configured to receive a PMI parameter sent by the terminal, where the PMI parameter includes a first feedback parameter and a second feedback parameter; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; an obtaining module 603, configured to obtain PMIs of the TRPs according to the PMI parameters.
In one possible implementation, the target parameters include:
Port configuration parameters N1, i and N2, i, where N1, i and N2, i are the number of antenna ports configured by the network side for TRP i in two dimensions of the same polarization respectively; or alternatively, the process may be performed,
the port configuration parameters N1, i and N2, i, and the number of the plurality of TRPs n_ntrp;
wherein, TRP i is the i+1th TRP in the plurality of TRPs, i epsilon {0,1, …, N_Ntrp-1}.
In one possible implementation, the target parameters further include:
a predetermined number L of said target orthogonal beams i Wherein L is i A predetermined number of the target orthogonal beams corresponding to the TRP i; or, a predetermined total number l_total of the target orthogonal beams, where l_total is a sum of numbers of the target orthogonal beams corresponding to the plurality of TRPs.
In one possible implementation, the number N of the plurality of TRPs is indicated to the terminal Ntrp Comprising:
the network side equipment configures the number N of the TRPs for the terminal Ntrp The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively, the process may be performed,
the network side equipment indicates the number N of the TRPs according to the configured target information Ntrp Wherein the target information includes one of: channel measurement resources CMR, transmission configuration indication TCI, higher layer configuration signaling.
In one possible implementation, indicating to the terminal target parameters for a plurality of TPRs that allow for joint transmission includes:
uniformly configuring a set of target parameters for a plurality of TRPs, wherein the target parameters indicate that the target parameters of the plurality of TRPs are the same; or alternatively, the process may be performed,
and respectively configuring a set of target parameters for each TRP, and indicating a set of target parameters corresponding to each TRP, wherein the target parameters configured for each TRP are not identical.
The PMI acquisition device for multi-TRP transmission provided in the embodiment of the present application can implement each process implemented by the network side or the network side device in the method embodiments of fig. 2 to fig. 4, and achieve the same technical effects, and in order to avoid repetition, a detailed description is omitted here.
Optionally, as shown in fig. 7, the embodiment of the present application further provides a communication device 700, including a processor 701 and a memory 702, where the memory 702 stores a program or an instruction that can be executed on the processor 701, for example, when the communication device 700 is a terminal, the program or the instruction is executed by the processor 701 to implement the steps of the embodiment of the feedback method of PMI transmitted by multiple TRPs, and the same technical effects can be achieved. When the communication device 700 is a network side device, the program or the instruction implements the steps of the PMI acquisition method embodiment for multi-TRP transmission when executed by the processor 701, and the same technical effects can be achieved, so that repetition is avoided and no further description is given here.
The embodiment of the application also provides a terminal which comprises a processor and a communication interface, wherein the processor is used for realizing the steps of the PMI feedback method embodiment of the multi-TRP transmission, and the communication interface is used for communicating with external equipment. The terminal embodiment corresponds to the terminal-side method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the terminal embodiment, and the same technical effects can be achieved. Specifically, fig. 8 is a schematic diagram of a hardware structure of a terminal for implementing an embodiment of the present application.
The terminal 800 includes, but is not limited to: at least part of the components of the radio frequency unit 801, the network module 802, the audio output unit 803, the input unit 804, the sensor 805, the display unit 806, the user input unit 807, the interface unit 808, the memory 809, and the processor 810, etc.
Those skilled in the art will appreciate that the terminal 800 may further include a power source (e.g., a battery) for powering the various components, and that the power source may be logically coupled to the processor 810 by a power management system for performing functions such as managing charging, discharging, and power consumption by the power management system. The terminal structure shown in fig. 8 does not constitute a limitation of the terminal, and the terminal may include more or less components than shown, or may combine certain components, or may be arranged in different components, which will not be described in detail herein.
It should be appreciated that in embodiments of the present application, the input unit 804 may include a graphics processing unit (Graphics Processing Unit, GPU) 8041 and a microphone 8042, with the graphics processor 8041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. 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. Touch panel 8071, also referred to as 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, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and so forth, which are not described in detail herein.
In the embodiment of the present application, after receiving downlink data from the network side device, the radio frequency unit 801 may transmit the downlink data to the processor 810 for processing; in addition, the radio frequency unit 801 may send uplink data to the network side device. In general, 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 may be used to store software programs or instructions and various data. The memory 809 may mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area may store an operating system, application programs or instructions (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like. Further, the memory 809 may include volatile memory or nonvolatile memory, or the memory 809 may include both volatile and nonvolatile memory. The non-volatile memory may be a Read-only memory (ROM), a programmable Read-only memory (ProgrammableROM, PROM), an erasable programmable Read-only memory (ErasablePROM, EPROM), an electrically erasable programmable Read-only memory (ElectricallyEPROM, EEPROM), or a flash memory, among others. The volatile memory may be random access memory (Random Access Memory, RAM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (ddr SDRAM), enhanced SDRAM (Enhanced SDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DRRAM). Memory 809 in embodiments of the application includes, but is not limited to, these and any other suitable types of memory.
The processor 810 may include one or more processing units; optionally, the processor 810 integrates an application processor that primarily processes operations involving an operating system, user interface, application programs, etc., and a modem processor that primarily processes wireless communication signals, such as a baseband processor. It will be appreciated that the modem processor described above may not be integrated into the processor 810.
Wherein the processor 810 is configured to:
determining an orthogonal beam group set corresponding to each TRP according to target parameters configured by a network side for a plurality of TRPs allowing joint transmission;
selecting a target orthogonal beam group corresponding to each TRP from the orthogonal beam group set corresponding to each TRP according to the channel information of each TRP, and selecting a preset number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group;
determining a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back the target orthogonal beams of the preset number in each target orthogonal beam group; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups;
A radio frequency unit 801, configured to send a PMI parameter, where the PMI parameter includes the first feedback parameter and the second feedback parameter.
The embodiment of the application also provides a network side device, which comprises a processor and a communication interface, wherein the processor is used for realizing the steps of the PMI acquisition method embodiment of the multi-TRP transmission, and the communication interface is used for communicating with an external device. The network side device embodiment corresponds to the network side device method embodiment, and each implementation process and implementation manner of the method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.
Specifically, the embodiment of the application also provides network side equipment. As shown in fig. 9, the network side device 900 includes: an antenna 901, a radio frequency device 902, a baseband device 903, a processor 904, and a memory 905. The antenna 901 is connected to a radio frequency device 902. In the uplink direction, the radio frequency device 902 receives information via the antenna 901, and transmits the received information to the baseband device 903 for processing. In the downlink direction, the baseband device 903 processes information to be transmitted, and transmits the processed information to the radio frequency device 902, and the radio frequency device 902 processes the received information and transmits the processed information through the antenna 901.
The method performed by the network side device in the above embodiment may be implemented in the baseband apparatus 903, where the baseband apparatus 903 includes a baseband processor.
The baseband apparatus 903 may, for example, include at least one baseband board, where a plurality of chips are disposed, as shown in fig. 9, where one chip, for example, a baseband processor, is connected to the memory 905 through a bus interface, so as to call a program in the memory 905 to perform the network device operation shown in the above method embodiment.
The network-side device may also include a network interface 906, such as a common public radio interface (common public radio interface, CPRI).
Specifically, the network side device 900 of the embodiment of the present application further includes: instructions or programs stored in the memory 905 and executable on the processor 904, the processor 904 calls the instructions or programs in the memory 905 to perform the method performed by the modules shown in fig. 6, and achieve the same technical effects, so that repetition is avoided and therefore a description thereof is omitted.
The embodiment of the present application further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, where the program or the instruction implements each process of the foregoing embodiment of the feedback method for the PMI transmitted by multiple TRPs or implements each process of the foregoing embodiment of the PMI acquisition method for multiple TRPs when executed by a processor, and the process or the instruction can achieve the same technical effect, so that repetition is avoided and no further description is given here.
Wherein the processor is a processor in the terminal described in the above embodiment. The readable storage medium includes computer readable storage medium such as computer readable memory ROM, random access memory RAM, magnetic or optical disk, etc.
The embodiment of the 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 for running a program or an instruction, implementing each process of the above-mentioned PMI feedback method embodiment of multi-TRP transmission, or implementing each process of the above-mentioned PMI acquisition method embodiment of multi-TRP transmission, and can achieve the same technical effect, so that repetition is avoided, and no further description is given here.
It should be understood that the chips referred to in the embodiments of the present application may also be referred to as system-on-chip chips, or the like.
The embodiments of the present application further provide a computer program/program product stored in a storage medium, where the computer program/program product is executed by at least one processor to implement each process of the above-described multi-TRP transmission PMI feedback method embodiment or implement each process of the above-described multi-TRP transmission PMI acquisition method embodiment, and achieve the same technical effect, and are not repeated herein.
The embodiment of the application also provides a feedback system of the PMI transmitted by the multiple TRPs, which comprises the following steps: the terminal may be used for performing the steps of the feedback method of the PMI of the multi-TRP transmission described above, and the network side device may be used for performing the steps of the PMI acquisition method of the multi-TRP transmission described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a computer software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present application.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims (41)

1. A feedback method for precoding matrix indicator PMI transmitted by multiple transmission receiving points TRP, comprising:
the terminal determines an orthogonal beam group set corresponding to each TRP according to target parameters configured by the network side for a plurality of TRPs allowing joint transmission;
selecting a target orthogonal beam group corresponding to each TRP from the orthogonal beam group set corresponding to each TRP according to the channel information of each TRP, and selecting a preset number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group;
determining a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back the target orthogonal beams of the preset number in each target orthogonal beam group; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups;
the terminal sends a PMI parameter, wherein the PMI parameter comprises the first feedback parameter and the second feedback parameter.
2. The method according to claim 1, wherein the determining, by the terminal, the set of orthogonal beam groups corresponding to each TRP according to the target parameters configured by the network side for the plurality of TRPs, includes:
acquiring target parameters of each TRP;
acquiring an oversampling factor O corresponding to TRP i according to target parameters of TRP i and according to indication or preset information of high-level signaling 1，i And O 2，i Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i e (0, 1, N. Ntrp -1，NN trp A number of the plurality of TRPs;
based on the obtained oversampling factor O of the TRP i 1，i And O 2，i Obtain the orthogonal beam group set corresponding to the TRP iWherein the orthogonal beam group set +.>With O therein 1，i *O 2，i Sets of orthogonal beams.
3. The method of claim 2, wherein the target parameters include:
port configuration parameter N 1，i And N 2，i Wherein N is 1，i And N 2，i The number of the antenna ports configured for the TRP i in two dimensions of the same polarization at the network side is respectively; or alternatively, the process may be performed,
the port configuration parameter N 1，i And N 2，i And the number N of the plurality of TRPs Ntrp 。
4. A method according to claim 2 or 3, wherein the target parameters further comprise:
A predetermined number Li of the target orthogonal beams, wherein Li is the predetermined number of the target orthogonal beams corresponding to the TRP i;
or, a predetermined total number l_total of the target orthogonal beams, where l_total is a sum of numbers of the target orthogonal beams corresponding to the plurality of TRPs.
5. The method of claim 3, wherein the number N of the plurality of TRPs is obtained Ntrp Comprising:
acquiring the number N of the plurality of TRPs configured on the network side Ntrp The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively, the process may be performed,
acquiring the number N of the TRPs according to the configured target information Ntrp Wherein the target information includes one of: channel measurement resource CMR,Transmission configuration indicates TCI, higher layer configuration signaling.
6. The method according to claim 3 or 4, wherein obtaining the target parameter of each of the TRPs comprises:
acquiring a set of target parameters uniformly configured for a plurality of TRPs by a network side, wherein the target parameters of the plurality of TRPs are the same; or alternatively, the process may be performed,
and acquiring a set of target parameters configured by the network side for each TRP respectively, wherein the target parameters configured by each TRP are not identical.
7. The method according to claim 5, wherein in case of a set of the target parameters uniformly configured by the network side for each TRP, the target parameters further include: oversampling factor O 1 And O 2 The oversampling factor O corresponding to TRP i 1，i ＝O 1 ，O 2，i ＝O 2 。
8. The method according to any one of claims 2 to 7, wherein selecting a target orthogonal beam group corresponding to each of the TRPs from the orthogonal beam group set corresponding to each of the TRPs, and selecting a predetermined number of target orthogonal beams corresponding to each of the TRPs from the target orthogonal beam group, according to channel information of each of the TRPs, comprises:
acquiring orthogonal beam group sequence number q of TRP i according to channel information of TRP i 1，i And q 2，i Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i e {0, 1.. Ntrp -1}，N Ntrp A number of the plurality of TRPs;
according to q1，i And q 1，i Determining the orthogonal beam group set corresponding to the TRP iWherein 0.ltoreq.q 1，i ≤O 1，i And 0.ltoreq.q 2，i ≤O 2，i The target orthogonal beam group comprises N 1，i *N 2，i The orthogonal beams;
acquiring L corresponding to the TRP i from the target orthogonal beam group by utilizing the channel information of the TRP i i A target orthogonal beam, L i A predetermined number of the target orthogonal beams corresponding to the TRP i.
9. The method of claim 8, wherein prior to determining a first feedback parameter for feeding back a plurality of target orthogonal beam groups corresponding to the TRP and a second feedback parameter for feeding back the predetermined number of target orthogonal beams in each of the target orthogonal beam groups, the method further comprises:
Global numbering is carried out on the sequence numbers of the target orthogonal beam groups corresponding to the TRPs, so that a plurality of target orthogonal beam group information corresponding to the TRPs is obtained;
globally numbering the identification information of the Li target orthogonal beams corresponding to each TRP to obtain the serial numbers of the target orthogonal beams corresponding to the TRPs, wherein the identification information is the identification information of the target orthogonal beams in the target orthogonal beam group, and the identification information comprises a parameter m i And l i ，m i And l i Is an integer and 0.ltoreq.m i ≤N 2，i And 0.ltoreq.l i ≤N 1，i 。
10. The method of claim 9, wherein globally numbering sequence numbers of the target orthogonal beam groups for each of the TRPs comprises one of:
sequence number q of beam orthogonal group of TRP i 1，i And q 2，i Respectively numbered q 1 ＝(i*O 1，i )+q 1，i ，q 2 ＝q 2，i ；
Sequence number q of beam orthogonal group of TRP i 1，i And q 2，i Respectively numbered q 2 ＝(i*O 2，i )+q 2，i ，q 1 ＝q 1，i ；
Sequence number q of beam orthogonal group of TRP i 1，i And q 2，i Respectively numbered as
Sequence number q of beam orthogonal group of TRP i 1，i And q 2，i Respectively numbered as
Wherein O is 1，k ，O 2，k An oversampling factor representing TRP k among a plurality of said TRPs.
11. The method according to claim 9, wherein for each of said TRP corresponding L i The identification information of each target orthogonal beam is globally numbered, including one of the following:
l of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam: m= (i x N) 2 )+m i ，l＝l i ；
L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam: m=m i ，l＝(i*N 1 )+l i ；
L of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam:
l of the TRP i i Numbering the identification information of one target orthogonal beam in the target orthogonal beams to obtain the serial number of the target orthogonal beam:
wherein N is 1，k ，N 2，k Port configuration parameters representing TRP k.
12. The method according to any one of claims 1 to 11, wherein determining the first combined number indicative of a plurality of target orthogonal beam groups to which the TRPs correspond comprises:
mapping the sequence number of the target orthogonal beam group corresponding to each TRP into a first combination number i 1，1 Wherein i is 1，1 For indicating N in orthogonal vector group corresponding to the TRP trp Number of individual vector groupWherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i e {0, 1.. Ntrp -1}，N Ntrp For the number of TRPs, O 1，i O 2，i To obtain the oversampling factor of TRP i, N trp Representing the number of a plurality of said TRPs, < >>Representing from->N selected from the orthogonal beam groups trp The number of combinations corresponding to each target orthogonal beam group.
13. The method of claim 12, wherein the first combination number i 1，1 The mapping relation of the sequence numbers of the target orthogonal beam groups corresponding to the TRPs comprises the following steps:
wherein (1)>Or alternatively, the process may be performed,n i for the global sequence number of the ith target orthogonal beam group, i is more than or equal to 0 and less than or equal to N trp -1；/>Sequence number q representing the target beam group corresponding to the ith TRP 2 ，/>A sequence number q representing the target beam group corresponding to the TRP i 1 Wherein, the method comprises the steps of, wherein,q is 0.ltoreq.q 2 ≤O 2 Or 0.ltoreq.q 1 ≤O 1 And +.>
14. The method of claim 12, wherein determining the second number of combinations indicative of the predetermined number of target orthogonal beams in each of the target orthogonal beam groups comprises:
mapping the serial numbers of the target orthogonal beams corresponding to the TRPs into a second combination number i 1，2 Wherein i is 1，2 For indicating that all target orthogonal beam groups indicated by the first combination number are within Sequence numbers of the target orthogonal beams, L i A predetermined number of said target orthogonal beams being TRPi.
15. The method of claim 14, wherein the step of providing the first information comprises,
wherein N is 1，i And N 2，i For the number of antenna ports configured by the network side in two dimensions of the same polarization for the TRpi,/for the network side>Representing from->Select +.>Number of combinations of the individual target orthogonal beams.
16. The method of claim 15, wherein i 1，2 And (3) withThe mapping relation of the sequence numbers of the target orthogonal beams comprises the following steps:
wherein (1)>Or (F)>Wherein n is i For the global sequence number of the ith target orthogonal beam, sequence number m representing the ith target orthogonal beam i ，/>Sequence number l representing the ith target orthogonal beam i Wherein 0.ltoreq.m i ≤N 2 And +.>Or->0.ltoreq.l i ≤N 1 。
17. The method according to any one of claims 1 to 16, characterized in that before the terminal transmits PMI parameters, the method further comprises:
acquiring configuration parameters of a network side, and acquiring the time delay information quantity corresponding to each TRP;
and acquiring the time delay information of the plurality of TRPs according to the time delay information quantity corresponding to each TRP, wherein the PMI parameter also comprises the time delay information of the plurality of TRPs.
18. The method of claim 17 wherein the amount of delay information is different for different of the TRPs.
19. The method of claim 18, wherein obtaining the delay information for the plurality of TRPs based on the number of delay information comprises: and acquiring the time delay information of the plurality of TRPs according to the maximum time delay information quantity in the plurality of TRPs.
20. The method according to any one of claims 1 to 16, characterized in that before the terminal transmits PMI parameters, the method further comprises:
the terminal obtains feedback coefficients of a coefficient matrix for feeding back the PMI, wherein the PMI parameters further comprise the feedback coefficients.
21. The method of claim 20, wherein the terminal obtaining feedback coefficients of the coefficient matrix for feeding back the PMI comprises:
the terminal sets the amplitude of the TRP corresponding to the strongest coefficient in the coefficient matrix as a reference value, and obtains amplitude quantization coefficients among the TRPs by quantizing the amplitude of the strongest coefficient of other TRPs based on the reference value.
22. The method of claim 21, wherein the terminal transmitting the PMI parameter comprises: the terminal maps the PMI parameters into Channel State Information (CSI) for transmission, wherein amplitude quantization coefficients among the TRPs are mapped in a second part of the CSI, and the amplitude quantization coefficients are positioned before polarization amplitude indication in the PMI parameters or between the polarization amplitude indication and window indication in the PMI parameters.
23. A PMI acquisition method for multi-TRP transmission, comprising:
the network side equipment indicates target parameters of a plurality of TPRs which are allowed to be jointly transmitted to the terminal;
receiving a PMI parameter sent by the terminal, wherein the PMI parameter comprises a first feedback parameter and a second feedback parameter; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups;
and the network side equipment acquires PMIs of the TRPs according to the PMI parameters.
24. The method of claim 23, wherein the target parameters comprise:
port configuration parametersN 1，i And N 2，i Wherein N is 1，i And N 2，i The number of the antenna ports configured for TRP i on the network side in two dimensions of the same polarization is respectively; or alternatively, the process may be performed,
the port configuration parameter N 1，i And N 2，i And the number N of the plurality of TRPs Ntrp ；
Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i ε {0,1, …, N Ntrp -1}。
25. The method of claim 24, wherein the target parameters further comprise:
A predetermined number L of said target orthogonal beams i Wherein L is i A predetermined number of the target orthogonal beams corresponding to the TRP i;
or, a predetermined total number l_total of the target orthogonal beams, where l_total is a sum of numbers of the target orthogonal beams corresponding to the plurality of TRPs.
26. The method according to claim 24, wherein the network side device indicates the number N of the plurality of TRPs to a terminal Ntrp Comprising:
the network side equipment configures the number N of the TRPs for the terminal Ntrp The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively, the process may be performed,
the network side equipment indicates the number N of the TRPs according to the configured target information Ntrp Wherein the target information includes one of: channel measurement resources CMR, transmission configuration indication TCI, higher layer configuration signaling.
27. The method according to any one of claims 23 to 26, wherein the network side device indicates to the terminal target parameters of a plurality of TPRs that are allowed to be jointly transmitted, comprising:
the network side equipment uniformly configures a set of target parameters for the TRPs, and indicates that the target parameters of the TRPs are the same; or alternatively, the process may be performed,
the network side equipment configures a set of target parameters for each TRP respectively and indicates a set of target parameters corresponding to each TRP respectively, wherein the target parameters configured for each TRP are not identical.
28. A feedback apparatus for PMI of multi-TRP transmission, comprising:
a first determining module, configured to determine, according to a target parameter configured by a network side for a plurality of TRPs allowing joint transmission, an orthogonal beam group set corresponding to each TRP;
a selecting module, configured to select, according to channel information of each TRP, a target orthogonal beam group corresponding to the TRP from the orthogonal beam group set corresponding to each TRP, and select a predetermined number of target orthogonal beams corresponding to each TRP from the target orthogonal beam group;
a second determining module, configured to determine a first feedback parameter for feeding back target orthogonal beam groups corresponding to the TRPs and a second feedback parameter for feeding back the predetermined number of target orthogonal beams in each of the target orthogonal beam groups; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups;
the first sending module is configured to send a PMI parameter, where the PMI parameter includes the first feedback parameter and the second feedback parameter.
29. The apparatus of claim 28 wherein said first determining means determines a set of orthogonal beam groups corresponding to each of said TRPs comprises:
acquiring target parameters of each TRP;
acquiring an oversampling factor O corresponding to TRP i according to target parameters of TRP i and according to indication or preset information of high-level signaling 1，i And O 2，i WhereinThe TRP i is the (i+1) th TRP of the plurality of TRPs, i e {0,1,., n. Ntrp -1，NN trp A number of the plurality of TRPs;
based on the obtained oversampling factor O of the TRP i 1，i And O 2，i Obtain the orthogonal beam group set corresponding to the TRP iWherein the orthogonal beam group set +.>With O therein 1，i *O 2，i Sets of orthogonal beams.
30. The apparatus of claim 29, wherein the first determining module obtaining the target parameter for each of the TRPs comprises:
acquiring a set of target parameters uniformly configured for a plurality of TRPs by a network side, wherein the target parameters indicate that the plurality of TRPs are the same; or alternatively, the process may be performed,
and respectively acquiring a set of target parameters configured by the network side for each TRP, and indicating a set of target parameters respectively corresponding to each TRP, wherein the target parameters configured by the network side for each TRP are not completely the same.
31. The method of claim 29 or 30, wherein said selecting means selects a target orthogonal beam group corresponding to each of said TRPs from said set of orthogonal beam groups corresponding to said TRPs, and selects a predetermined number of target orthogonal beams corresponding to each of said TRPs from said target orthogonal beam group, comprising:
acquiring orthogonal beam group sequence number q of TRP i according to channel information of TRP i 1，i And q 2，i Wherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i e {0, 1.. Ntrp -1}，N Ntrp A number of the plurality of TRPs;
according toq 1，i And q 1，i Determining the orthogonal beam group set corresponding to the TRP iWherein 0.ltoreq.q 1，i ≤O 1，i And 0.ltoreq.q 2，i ≤O 2，i The target orthogonal beam group comprises N 1，i *N 2，i The orthogonal beams;
acquiring Li target orthogonal beams corresponding to the TRP i from the target orthogonal beam group by utilizing the channel information of the TRP i, wherein L is i A predetermined number of the target orthogonal beams corresponding to the TRP i.
32. The apparatus of claim 31, wherein the second determination module is further configured to:
global numbering is carried out on the sequence numbers of the target orthogonal beam groups corresponding to the TRPs, so that a plurality of target orthogonal beam group information corresponding to the TRPs is obtained;
Globally numbering the identification information of the Li target orthogonal beams corresponding to each TRP to obtain the serial numbers of the target orthogonal beams corresponding to the TRPs, wherein the identification information is the identification information of the target orthogonal beams in the target orthogonal beam group, and the identification information comprises a parameter m i And l i ，m i And l i Is an integer and 0.ltoreq.m i ≤N 2，i And 0.ltoreq.l i ≤N 1，i 。
33. The apparatus of any of claims 28 to 32, wherein the second determining module determines the first combined number indicative of a plurality of target orthogonal beam groups to which the TRPs correspond, comprising:
mapping the sequence number of the target orthogonal beam group corresponding to each TRP into a first combination number i 1，1 Wherein i is 1，1 For indicating N in orthogonal vector group corresponding to the TRP trp Group of vectorsSequence numberWherein the TRP i is the (i+1) th TRP of the plurality of TRPs, i e {0, 1.. Ntrp -1}，N Ntrp For the number of TRPs, O 1，i O 2，i To obtain the oversampling factor of TRP i, N trp Representing the number of a plurality of said TRPs, < >>Representing from->N selected from the orthogonal beam groups trp The number of combinations corresponding to each target orthogonal beam group.
34. The apparatus of claim 33, wherein the second determination module determining the second combined number indicative of the predetermined number of target orthogonal beams in each of the target orthogonal beam groups comprises:
Mapping the serial numbers of the target orthogonal beams corresponding to the TRPs into a second combination number i 1，2 Wherein i is 1，2 For indicating that all target orthogonal beam groups indicated by the first combination number are withinSequence numbers of the target orthogonal beams, L i A predetermined number of said target orthogonal beams being TRP i.
35. The apparatus of any one of claims 28 to 34, wherein the second determination module is further configured to:
acquiring configuration parameters of a network side, and acquiring the time delay information quantity corresponding to each TRP;
and acquiring the time delay information of the plurality of TRPs according to the time delay information quantity corresponding to each TRP, wherein the PMI parameter also comprises the time delay information of the plurality of TRPs.
36. The apparatus of any one of claims 28 to 34, wherein the second determination module is further configured to:
and obtaining feedback coefficients of a coefficient matrix for feeding back the PMI, wherein the PMI parameters further comprise the feedback coefficients.
37. The apparatus of claim 36, wherein the first transmitting module transmits the PMI parameter, comprising: mapping the PMI parameters into the CSI for transmission, wherein amplitude quantization coefficients among the TRPs are mapped in a second part of the CSI, and are positioned before polarization amplitude indication in the PMI parameters or are positioned between the polarization amplitude indication and window indication in the PMI parameters.
38. A PMI acquisition apparatus for multi-TRP transmission, comprising:
a second transmitting module for indicating to the terminal target parameters of the plurality of TPRs that allow joint transmission;
the receiving module is used for receiving PMI parameters sent by the terminal, wherein the PMI parameters comprise a first feedback parameter and a second feedback parameter; wherein the first feedback parameter comprises a first combination number indicating a target orthogonal beam group corresponding to a plurality of the TRPs, and/or the second feedback parameter comprises a second combination number indicating the predetermined number of target orthogonal beams in each of the target orthogonal beam groups;
an acquisition module, configured to acquire PMIs of the TRPs according to the PMI parameters.
39. A terminal comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the method of feedback of a multi-TRP transmitted PMI according to any of claims 1 to 22.
40. A network side device comprising a processor and a memory storing a program or instructions executable on the processor, which when executed by the processor, implement the steps of the multi-TRP transmitted PMI acquisition method according to any of claims 23 to 27.
41. A readable storage medium, wherein a program or an instruction is stored on the readable storage medium, which when executed by a processor, implements the steps of the feedback method of the PMI of the multi-TRP transmission according to any one of claims 1 to 22 or the steps of the PMI acquisition method of the multi-TRP transmission according to any one of claims 23 to 27.
CN202211228519.6A 2022-04-25 2022-10-09 Feedback method of PMI (precoding matrix indicator) transmitted by multiple TRPs (time division multiple access), terminal and network side equipment Pending CN116996102A (en)

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