CN111435850B

CN111435850B - Vector indication method and communication device for constructing precoding vector

Info

Publication number: CN111435850B
Application number: CN201910028291.8A
Authority: CN
Inventors: 王潇涵; 金黄平; 毕晓艳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-11
Filing date: 2019-01-11
Publication date: 2022-06-14
Anticipated expiration: 2039-01-11
Also published as: CN111435850A; WO2020143580A1

Abstract

The application provides a vector indication method and a communication device for constructing a precoding vector. The method comprises the following steps: the terminal equipment generates and sends first indication information, wherein the first indication information is used for indicating one or more frequency domain vectors, the one or more frequency domain vectors are used for constructing precoding vectors corresponding to one or more frequency domain units in a frequency domain unit group, and the length of the frequency domain vector is determined by the number of frequency domain units contained in a bandwidth occupied by the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group. The frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reported bandwidth. Based on the length of the frequency domain vector determined by the method, the selected frequency domain vector can keep the continuity of the frequency domain and accurately reflect the change rule of the channel in the frequency domain, thereby being beneficial to obtaining higher feedback precision.

Description

Vector indication method and communication device for constructing precoding vector

Technical Field

The present application relates to the field of communications, and more particularly, to a vector indication method and a communication apparatus for constructing a precoding vector.

Background

In a Massive multiple-input multiple-output (Massive MIMO) technology, a network device may reduce interference between multiple users and interference between multiple signal streams of the same user through a precoding technique. Therefore, the signal quality is improved, space division multiplexing is realized, and the frequency spectrum utilization rate is improved.

The terminal device may determine a precoding vector by channel measurement, and hopefully, the network device obtains a precoding vector that is the same as or similar to the precoding vector determined by the terminal device through feedback. In order to reduce the feedback overhead and improve the feedback accuracy, in one implementation, the terminal device may indicate the precoding vector to the network device in a feedback manner combining spatial domain compression and frequency domain compression. Specifically, the terminal device may select one or more spatial vectors and one or more frequency domain vectors based on the precoding vectors of the frequency domain units on each transmission layer to fit the precoding vectors corresponding to the frequency domain units on each transmission layer by a weighted sum of matrices constructed by the spatial vectors and the frequency domain vectors.

However, the definition of the length of the frequency domain vector in this implementation is not yet clear.

Disclosure of Invention

The application provides a vector indicating method and a communication device for constructing a precoding vector, which aim to determine the length of a frequency domain vector and further determine the frequency domain vector for constructing the precoding vector.

In a first aspect, a vector indication method for constructing a precoding vector is provided, which may be performed by a terminal device, or may also be performed by a chip configured in the terminal device.

Specifically, the method comprises the following steps: generating first indication information, wherein the first indication information is used for indicating one or more frequency domain vectors, the one or more frequency domain vectors are used for constructing pre-coding vectors corresponding to one or more frequency domain units in a frequency domain unit group, and the length N of the frequency domain vector_fDetermining the number Q of the frequency domain units contained in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, wherein the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reporting bandwidth; n is a radical of_fAnd Q are both positive integers; and sending the first indication information.

In the embodiment of the application, the terminal device determines the length of the frequency domain vector based on the number of the frequency domain units included in the bandwidth occupied by the first to-be-reported frequency domain unit to the last to-be-reported frequency domain unit in the frequency domain unit group, so that the selected frequency domain vector can keep the continuity of the frequency domain, and the change rule of the channel in the frequency domain can be more accurately reflected. Therefore, higher feedback precision is obtained, precoding vectors recovered by the network equipment based on the feedback of the terminal equipment can be better adapted to the channel, and the subsequent data transmission performance is improved. On the contrary, if the length of the frequency domain vector is determined only according to the number of the frequency domain units to be reported, the selected frequency domain vector does not truly simulate the change rule of the channel on a plurality of consecutive frequency domain units, so that the change rule of the channel in the frequency domain cannot be accurately reflected, the feedback precision is affected, and the subsequent data transmission performance may be affected.

With reference to the first aspect, in certain implementations of the first aspect, the generating the first indication information includes: and generating the first indication information under the condition that the frequency domain units to be reported in the frequency domain unit group meet preset conditions.

That is to say, the terminal device may determine whether to use the method provided in the embodiment of the present application to feed back information for constructing a precoding vector according to the frequency domain unit to be reported. For example, when the frequency domain units to be reported are distributed in the frequency domain resources more continuously, the method provided by the embodiment of the present application may be adopted to feed back information for constructing the precoding vector; for another example, when the number of frequency domain units to be reported is large, the method provided in the embodiment of the present application may be used to feed back information for constructing a precoding vector.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes: and receiving second indication information, wherein the second indication information is used for indicating the number and the position of the frequency domain units to be reported.

The network device may indicate the number and the position of the frequency domain units to be reported to the terminal device through the second indication information, so that the terminal device determines whether to use the method provided in the embodiment of the present application to feed back information for constructing a precoding vector according to the number and/or the position of the frequency domain units to be reported, and may further determine the length of the frequency domain vector for frequency domain compression.

The second indication information may be, for example, a reporting bandwidth (CSI-reporting band) in a Channel State Information (CSI) reporting configuration (CSI-reporting configuration). The csi-reporting band indicates the number and the position of the sub-bands to be reported through a bitmap. When the granularity of the frequency domain unit to be reported is different from the granularity of the sub-band, the number and the position of the frequency domain unit to be reported can be determined based on the predetermined granularity relation between the frequency domain unit and the sub-band. Therefore, the csi-reporting band can indirectly indicate the number and the location of the frequency domain units to be reported.

It should be understood that csi-reporting band is only an example of the second indication information and should not be construed as limiting the present application in any way. The present application does not exclude the indication of the number and the location of the frequency domain units to be reported through other existing signaling or newly added signaling.

In a second aspect, a vector indication method for constructing a precoding vector is provided, which may be performed by a network device or a chip configured in the network device.

Specifically, the method comprises the following steps: receiving first indication information, wherein the first indication information is used for indicating one or more frequency domain vectors, the one or more frequency domain vectors are used for constructing precoding vectors corresponding to one or more frequency domain units in a frequency domain unit group, and the length N of the frequency domain vector _fDetermining the number Q of frequency domain units contained in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, wherein the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reporting bandwidth; n is a radical of_fAnd Q are positive integers; one or more frequency domain vectors are determined from the first indication information.

In the embodiment of the application, the length of the frequency domain vector is determined based on the number of the frequency domain units included in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, so that the selected frequency domain vector can keep the continuity of the frequency domain, and the change rule of the channel in the frequency domain can be more accurately reflected. Therefore, higher feedback precision is obtained, precoding vectors recovered by the network equipment based on the feedback of the terminal equipment can be better adapted to the channel, and the subsequent data transmission performance is improved. On the contrary, if the length of the frequency domain vector is determined only according to the number of the frequency domain units to be reported, the selected frequency domain vector does not truly simulate the change rule of the channel on a plurality of continuous frequency domain units, so that the change rule of the channel in the frequency domain cannot be accurately reflected, the feedback precision is affected, and the subsequent data transmission performance may be affected.

With reference to the second aspect, in some implementations of the second aspect, the determining the one or more frequency domain vectors according to the first indication information includes: and under the condition that the frequency domain units to be reported in the frequency domain unit group meet preset conditions, determining one or more frequency domain vectors according to the first indication information.

That is to say, the terminal device may determine whether to use the method provided in the embodiment of the present application to determine the length of the frequency domain vector according to the frequency domain unit to be reported, and feed back the precoding vector based on the method of the two-domain compression. For example, when the frequency domain units to be reported are more continuously distributed in the frequency domain resources, the method provided by the embodiment of the present application may be adopted to determine the length of the frequency domain vector, and the precoding vector is fed back based on the method of two-domain compression; for another example, when the number of frequency domain units to be reported is large, the method provided in the embodiment of the present application may be used to determine the length of the frequency domain vector, and the precoding vector may be fed back based on a method of two-domain compression.

With reference to the second aspect, in certain implementations of the second aspect, the method further includes: and sending second indication information, wherein the second indication information is used for indicating the number and the position of the frequency domain units to be reported.

The network device may indicate the number and the position of the frequency domain units to be reported to the terminal device through the second indication information, so that the terminal device determines whether to use the method provided in the embodiment of the present application to determine the length of the frequency domain vector according to the number and/or the position of the frequency domain units to be reported, feeds back the precoding vector based on the method of the two-domain compression, and may further determine the length of the frequency domain vector used for the frequency domain compression.

The second indication information may be, for example, a reporting bandwidth (CSI-reporting band) in a Channel State Information (CSI) reporting configuration (CSI-reporting configuration). The csi-reporting band indicates the number and the position of the sub-bands to be reported through a bitmap. When the granularity of the frequency domain unit to be reported is different from the granularity of the sub-band, the number and the position of the frequency domain unit to be reported can be determined based on the predetermined granularity relation between the frequency domain unit and the sub-band. Thus, the csi-reporting band may indirectly indicate the number and location of frequency domain elements to be reported.

It should be understood that csi-reporting band is only an example of the second indication information and should not be construed as limiting the present application in any way. The present application does not exclude the indication of the number and location of frequency domain units to be reported through other existing signaling or newly added signaling.

With reference to the first aspect or the second aspect, in certain implementations, the preset condition includes: the number of the frequency domain units to be reported in the frequency domain unit group is more than or equal to x multiplied by Q, x is a predefined value, and x is more than 0 and less than or equal to 1.

That is, when the ratio of the number of frequency domain units to be reported in the frequency domain unit group is relatively large, the method provided by the embodiment of the present application may be used to determine the length of the frequency domain vector, and the precoding vector may be fed back based on a dual-domain compression method.

Alternatively, x is 0.5.

It should be understood that x being 0.5 is only one possible value of x provided herein and should not be construed as limiting the present application in any way.

In certain implementations, in combination with the first or second aspect, N_f＝Q。

The set of frequency domain vectors may be predefined in sets of frequency domain vectors of different lengths. When the terminal device determines the Q value, a frequency domain vector having a length equal to the Q value may be directly selected from the set of frequency domain vectors. The length of the frequency domain vector determined based on the method enables the selected frequency domain vector to keep continuity of the frequency domain, thereby being beneficial to obtaining higher feedback precision.

In certain implementations, in combination with the first or second aspect, N _f＞Q。

It is also possible to define only a set of frequency domain vectors of a certain length in the set of frequency domain vectors. When the terminal device determines the Q value, a frequency domain vector having a length greater than the Q value may be selected from the set of frequency domain vectors. The length of the frequency domain vector determined based on the method enables the selected frequency domain vector to keep continuity of the frequency domain, thereby being beneficial to obtaining higher feedback precision.

In a third aspect, a method for reporting a Precoding Matrix Indicator (PMI) is provided, where the method may be performed by a terminal device, or may also be performed by a chip configured in the terminal device.

Specifically, the method comprises the following steps: generating a PMI; the PMI comprises an indication of one or more frequency domain vectors under the condition that a frequency domain unit to be reported in a frequency domain unit group meets a preset condition, wherein the one or more frequency domain vectors are partial frequency domain vectors in the frequency domain vector group, the frequency domain vector group comprises a plurality of frequency domain vectors, and the plurality of frequency domain vectors are orthogonal to each other pairwise; under the condition that the frequency domain unit to be reported in the frequency domain unit group does not meet the preset condition, the PMI does not comprise the indication of the frequency domain vector; the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reporting bandwidth; the PMI is transmitted.

In a fourth aspect, a method for reporting a PMI is provided, where the method may be performed by a network device or may be performed by a chip configured in the network device.

Specifically, the method comprises the following steps: receiving a PMI; the PMI comprises an indication of one or more frequency domain vectors under the condition that a frequency domain unit to be reported in a frequency domain unit group meets a preset condition, wherein the one or more frequency domain vectors are partial frequency domain vectors in a frequency domain vector group, the frequency domain vector group comprises a plurality of frequency domain vectors, and the plurality of frequency domain vectors are mutually orthogonal pairwise; under the condition that the frequency domain unit to be reported in the frequency domain unit group does not meet the preset condition, the PMI does not comprise the indication of the frequency domain vector; the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reporting bandwidth; and determining a precoding matrix corresponding to each frequency domain unit according to the PMI and whether the frequency domain unit to be reported in the frequency domain unit group meets the preset condition.

In the embodiment of the present application, for convenience of differentiation and description, a mode of selecting a part of frequency domain vectors from a frequency domain vector group and reporting the selected frequency domain vectors to construct a precoding vector is referred to as a first compression mode; the way in which the entire set of frequency domain vectors is used to construct the precoding vectors is referred to as the second compression way based on the frequency domain transform.

In order to obtain higher feedback accuracy with the same overhead, the terminal device may determine a reasonable feedback manner according to the number and/or position of the frequency domain units to be reported. In a plurality of feedback modes, such as a feedback mode including a type ii (type ii) codebook and a feedback mode based on dual-domain compression (including the first compression mode and the second compression mode), feedback overhead and feedback accuracy are considered comprehensively to achieve the effect of higher feedback accuracy at the same overhead.

With reference to the third aspect or the fourth aspect, in certain implementations, the preset condition includes: the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to x × Q, x is a predefined value, x is greater than 0 and less than or equal to 1, Q represents the number of the frequency domain units to be reported in the bandwidth occupied by the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group, and Q is a positive integer.

That is, when the ratio of the number of frequency domain units to be reported in the frequency domain unit group is relatively large, a part of frequency domain vectors can be selected from the frequency domain vector group as the frequency domain vectors for constructing the precoding vectors.

With reference to the third aspect or the fourth aspect, in certain implementations, the preset condition includes: the number of the frequency domain units to be reported in the frequency domain unit group is larger than or equal to a preset threshold.

That is, when the number of frequency domain units to be reported in the frequency domain unit group is large, all the frequency domain vectors in the frequency domain vector group can be used as the frequency domain vectors for constructing the precoding vectors.

With reference to the third aspect or the fourth aspect, in some implementations, in case that the frequency domain unit to be reported satisfies a preset condition, the frequency domain unit to be reported satisfies the preset conditionLength N of the frequency domain vector_fThe number Q of the frequency domain units of the PMI to be reported in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported is determined, N_fAnd Q are both positive integers.

The length of the frequency domain vector is determined based on the number of the frequency domain units contained in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, so that the selected frequency domain vector can keep the continuity of the frequency domain, and the change rule of the channel in the frequency domain can be more accurately reflected. Therefore, higher feedback precision is obtained, the precoding vector recovered by the network equipment based on the feedback of the terminal equipment can be better adapted to a channel, and the subsequent data transmission performance is improved.

With reference to the third aspect or the fourth aspect, in some implementation manners, if the PMI includes an indication of a frequency domain vector group, and the frequency domain vector in the frequency domain vector group has a length N when a frequency domain unit to be reported in the frequency domain unit group does not meet a preset condition, in some implementations, the PMI includes an indication of the frequency domain vector group ₄Determined by the number of frequency domain units to be reported in the frequency domain unit group, N₄Is a positive integer.

In the case of a small number of subbands, the entire set of frequency domain vectors may be considered for constructing the precoding vector. The length of the frequency domain vector is determined according to the number of the frequency domain units to be reported, that is, the same number of frequency domain vectors as the number of the frequency domain vectors are selected to construct the precoding vector. Compared with the length of the frequency domain vector determined by Q, the frequency domain vector used for constructing the precoding vector can be reduced, so that the number of reported weighting coefficients can be reduced, and the reduction of feedback overhead is facilitated.

In a fifth aspect, a communication device is provided, which includes various means or units for performing the method of any one of the possible implementations of the first aspect or the third aspect and the first aspect or the third aspect.

In a sixth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of the first aspect or the third aspect and any possible implementation manner of the first aspect or the third aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the terminal equipment. When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In a seventh aspect, a communication device is provided, which includes various means or units for performing the method of the second aspect or the fourth aspect and any possible implementation manner of the second aspect or the fourth aspect.

In an eighth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of the second or fourth aspect described above and any possible implementation of the second or fourth aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the network device. When the communication device is a chip configured in a network device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.

In a ninth aspect, there is provided a processor comprising: input circuit, output circuit and processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor performs the method of any one of the possible implementations of the first to fourth aspects and the first to fourth aspects.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the present application does not limit the specific implementation manner of the processor and various circuits.

In a tenth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory, and may receive a signal via the receiver and transmit a signal via the transmitter to perform the method of any one of the possible implementations of the first to fourth aspects and the first to fourth aspects.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

Alternatively, the memory may be integral to the processor or provided separately from the processor.

In a specific implementation process, the memory may be a non-transient memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.

It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, data output by the processor may be output to a transmitter and input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processing device in the tenth aspect may be a chip, the processor may be implemented by hardware or software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In an eleventh aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first to fourth aspects and of the first to fourth aspects described above.

In a twelfth aspect, a computer-readable medium is provided, which stores a computer program (which may also be referred to as code or instructions) that, when executed on a computer, causes the computer to perform the method of any one of the possible implementations of the first to fourth aspects and the first to fourth aspects.

In a thirteenth aspect, a communication system is provided, which includes the foregoing network device and terminal device.

Drawings

Fig. 1 is a schematic diagram of a communication system suitable for use in a vector indication method for constructing a precoding vector according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a vector indication method for constructing a precoding vector provided in an embodiment of the present application;

fig. 3 and fig. 4 are schematic diagrams of frequency domain unit groups and reporting bandwidths provided in the embodiment of the present application;

fig. 5 is a schematic diagram of a bitmap, a reported bandwidth, and a frequency domain unit group provided in an embodiment of the present application;

fig. 6 is a schematic flowchart of a method for reporting a PMI according to another embodiment of the present application;

fig. 7 is a schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 8 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (GSM) systems, Code Division Multiple Access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) systems, General Packet Radio Service (GPRS), Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD), universal mobile telecommunications system (universal mobile telecommunications system, UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, future fifth generation (5G) or new radio NR systems, etc.

To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 1 as an example. Fig. 1 is a schematic diagram of a communication system 100 for a vector indication method for constructing a precoding vector, which is suitable for use in an embodiment of the present application. As shown in fig. 1, the communication system 100 may include at least one network device, such as the network device 110 shown in fig. 1; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in fig. 1. Network device 110 and terminal device 120 may communicate over a wireless link. Each communication device, such as network device 110 or terminal device 120, may be configured with multiple antennas. For each communication device in the communication system 100, the configured plurality of antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Accordingly, communication between communication devices in the communication system 100, such as between the network device 110 and the terminal device 120, may be via multiple antenna techniques.

It should be understood that the network device in the communication system may be any device having a wireless transceiving function. The network devices include, but are not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), home base station (e.g., home evolved Node B or home Node B, HNB), baseband unit (BBU), Access Point (AP) in wireless fidelity (WiFi) system, wireless relay Node, wireless backhaul Node, Transmission Point (TP) or Transmission and Reception Point (TRP), etc., and may also be 5G, such as NR, gbb in the system, or transmission point (TRP or TP), one or a group of base stations in the 5G system may also include multiple antennas, or panels, and may also be configured as network panels or NB, such as a baseband unit (BBU), or a Distributed Unit (DU), etc.

In some deployments, the gNB may include Centralized Units (CUs) and DUs. The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB and the DU implements part of the function of the gNB. For example, a CU implements Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) functions, and a DU implements Radio Link Control (RLC), Medium Access Control (MAC) and Physical (PHY) functions. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as the RRC layer signaling, may also be considered to be transmitted by the DU or the DU + CU under this architecture. It is to be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in a Radio Access Network (RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

It should also be understood that terminal equipment in the wireless communication system may also be referred to as User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios.

It should also be understood that fig. 1 is a simplified schematic diagram that is merely illustrated for ease of understanding, and that other network devices or other terminal devices, which are not shown in fig. 1, may also be included in the communication system 100.

In order to facilitate understanding of the embodiments of the present application, the following is a brief description of the processing procedure of the downlink signal at the physical layer before transmission. It should be understood that the processing of the downstream signal described below may be performed by the network device, or may be performed by a chip configured in the network device. For convenience of description, hereinafter, collectively referred to as network devices.

The network device may process a codeword (code word) on a physical channel. Where the codeword may be coded bits that are encoded (e.g., including channel coding). The codeword is scrambled (scrambling) to generate scrambled bits. The scrambled bits are modulation mapped (modulation mapping) to obtain modulation symbols. The modulation symbols are mapped to a plurality of layers (layers), or transport layers, through layer mapping. The modulated symbols after layer mapping are precoded (precoding) to obtain precoded signals. The precoded signal is mapped to a plurality of Resource Elements (REs) after mapping the precoded signal to the REs. These REs are then modulated by Orthogonal Frequency Division Multiplexing (OFDM) and transmitted through an antenna port (antenna port).

It should be understood that the above-described processing procedure for the downlink signal is only an exemplary description, and should not limit the present application in any way. For the processing procedure of the downlink signal, reference may be made to the prior art, and a detailed description of the specific procedure is omitted here for brevity.

In order to facilitate understanding of the embodiments of the present application, the following description is briefly made of terms related to the embodiments of the present application. It should be understood that these descriptions are only for the purpose of facilitating understanding of the embodiments of the present application, and should not be construed as limiting the present application in any way.

1. The precoding technology comprises the following steps: under the condition that the channel state is known, a transmitting device (such as a network device) can process a signal to be transmitted by means of a precoding matrix matched with channel resources, so that the precoded signal to be transmitted is adapted to a channel, and the complexity of eliminating the influence between the channels by a receiving device (such as a terminal device) is reduced. Therefore, by precoding the signal to be transmitted, the received signal quality (e.g., signal to interference plus noise ratio (SINR)) is improved. Therefore, by using the precoding technique, the transmission between the sending device and the multiple receiving devices can be realized on the same time-frequency resource, that is, multi-user multiple input multiple output (MU-MIMO) is realized.

It should be understood that the related description regarding the precoding technique is merely exemplary for ease of understanding and is not intended to limit the scope of the embodiments of the present application. In a specific implementation process, the sending device may also perform precoding in other manners. For example, when the channel information (for example, but not limited to, the channel matrix) cannot be obtained, precoding is performed using a preset precoding matrix or a weighting method. For brevity, the detailed description thereof is not repeated herein.

2. Precoding matrix and Precoding Matrix Indication (PMI): the PMI may be used to indicate a precoding matrix. The precoding matrix may be, for example, a precoding matrix corresponding to each frequency domain unit determined by the terminal device based on the channel matrix of each frequency domain unit (e.g., subband).

The channel matrix may be determined by the terminal device through channel estimation or the like or based on channel reciprocity. However, it should be understood that the specific method for determining the channel matrix by the terminal device is not limited to the foregoing, and the specific implementation manner may refer to the prior art, which is not listed here for brevity.

The precoding matrix may be obtained by performing Singular Value Decomposition (SVD) on the channel matrix or a covariance matrix of the channel matrix, or may be obtained by performing eigenvalue decomposition (EVD) on the covariance matrix of the channel matrix.

It should be understood that the determination manner of the precoding matrix listed above is only an example, and should not constitute any limitation to the present application. The determination method of the precoding matrix can refer to the prior art, and is not listed here for brevity.

In this embodiment, the precoding matrix corresponding to the frequency domain unit may refer to a precoding matrix fed back by the frequency domain unit, and may be, for example, a precoding matrix that performs channel measurement and feedback based on a reference signal on the frequency domain unit. The precoding matrix corresponding to the frequency domain unit may be a precoding matrix for precoding data to be subsequently transmitted through the frequency domain unit. Hereinafter, the precoding matrix corresponding to a frequency domain element may also be simply referred to as the precoding matrix of the frequency domain element, and the precoding vector corresponding to a frequency domain element may also be referred to as the precoding vector of the frequency domain element.

It should be further noted that, in the embodiment of the present application, a precoding matrix determined by a network device based on feedback of a terminal device may be directly used for downlink data transmission; the precoding matrix finally used for downlink data transmission may also be obtained through some beamforming methods, for example, including zero-forcing (ZF), regularized zero-forcing (RZF), minimum mean-squared error (MMSE), signal-to-leakage-and-noise (SLNR), and so on. This is not a limitation of the present application. Unless otherwise specified, the precoding matrix (or vector) referred to in the following may refer to a precoding matrix (or vector) determined by the network device based on the terminal device feedback.

3. And (3) precoding vector: a precoding matrix may comprise one or more vectors, such as column vectors. One precoding matrix may be used to determine one or more precoding vectors.

When the number of transmission layers is 1 and the number of polarization directions of the transmit antennas is also 1, the precoding vector may be a precoding matrix. When the number of transmission layers is multiple and the number of polarization directions of the transmit antennas is 1, the precoding vector may refer to a component of the precoding matrix on one transmission layer. When the number of transmission layers is 1 and the number of polarization directions of the transmit antennas is multiple, the precoding vector may refer to a component of the precoding matrix in one polarization direction. When the number of transmission layers is multiple and the number of polarization directions of the transmit antennas is also multiple, the precoding vector may refer to a component of the precoding matrix in one transmission layer and one polarization direction.

It should be understood that the precoding vector may also be determined from the vector in the precoding matrix, e.g., by mathematically transforming the vector in the precoding matrix. The mathematical transformation relation between the precoding matrix and the precoding vector is not limited in the present application.

4. Antenna port (antenna port): referred to as a port for short. Which may be understood as a virtual antenna identified by the receiving device. Or spatially distinguishable transmit antennas. One antenna port may be configured for each virtual antenna, each virtual antenna may be a weighted combination of multiple physical antennas, each antenna port may correspond to one reference signal, and thus, each antenna port may be referred to as a port of one reference signal. In the embodiment of the present application, an antenna port may refer to an actual independent transmit unit (TxRU).

5. And (3) double-domain compression: including spatial domain compression and frequency domain compression. Spatial compression may refer to the selection of one or more spatial vectors in a set of spatial vectors as the spatial vectors from which to construct the precoding vectors. Frequency domain compression may refer to selecting one or more frequency domain vectors in a set of frequency domain vectors as the frequency domain vectors from which to construct the precoding vectors. The selected spatial vector is part or all of the spatial vectors in the set of spatial vectors. The selected frequency domain vector is part or all of the set of frequency domain vectors.

The matrix determined by one spatial vector and one frequency domain vector may be, for example, a space-frequency component matrix. The selected one or more spatial vectors and one or more frequency domain vectors may be used to determine one or more matrices of space-frequency components. The weighted sum of the one or more space-frequency component matrices may be used to construct a space-frequency matrix corresponding to one transmission layer. In other words, the space-frequency matrix may be approximated as a weighted sum of the space-frequency component matrices determined by the selected one or more space-frequency vectors and one or more frequency-domain vectors described above. Here, a space-frequency vector and a frequency-domain vector used to construct a space-frequency component matrix may be referred to as a space-frequency vector pair.

Therefore, after the network device obtains the space vector, the frequency domain vector and the weighting coefficient which can be used for constructing the space-frequency matrix, the precoding vector corresponding to each frequency domain unit can be further determined based on the constructed space-frequency matrix.

In one possible implementation, the terminal device may feed back, to the network device, indications of L spatial vectors, indications of M frequency-domain vectors, and indications of K weighting coefficients. Wherein K is less than or equal to L multiplied by M. Wherein, L space-frequency vectors and M frequency-domain vectors can be used for constructing and obtaining L multiplied by M space-frequency vector pairs. Each of the L × M space-frequency vector pairs may include one of the L space-frequency vectors and one of the M frequency-domain vectors. A space-frequency vector pair is uniquely defined by a space-frequency vector and a frequency-domain vector. The terminal device may feed back the weighting coefficients based on some or all of the pairs of space-frequency vectors. Therefore, the number K of weighting coefficients fed back by the terminal device may be less than or equal to the number L × M of space-frequency vector pairs.

It should be understood that the above illustrates one possible implementation of dual-domain compression for ease of understanding only, and this should not be construed as limiting the present application in any way. For example, at least one of the L spatial vectors and the M frequency-domain vectors may be predefined, but the present application is not limited thereto.

In summary, the dual-domain compression is performed in both spatial and frequency domains. The terminal device may feed back the selected one or more spatial vectors and one or more frequency-domain vectors to the network device during the feedback, instead of separately feeding back the weighting coefficients (e.g., including amplitude and phase) of the subbands based on each frequency-domain unit (e.g., subband). Thus, feedback overhead can be greatly reduced. Meanwhile, since the frequency domain vector can represent the change rule of the channel in frequency, the change of the channel in frequency domain is simulated by linear superposition of one or more frequency domain vectors. Therefore, higher feedback accuracy can still be maintained, so that the precoding matrix recovered by the network device based on the feedback of the terminal device can still be well adapted to the channel.

For details of the dual domain compression reference may be made to the third generation partnership project (3) of proposal number R1-1813002^rdgeneration partnership project, 3GPP) proposes "DFT-based compression". A detailed description of the method is omitted here for the sake of brevity.

6. Frequency domain vector (frequency domain vector): the vector for representing the change rule of the channel in the frequency domain is provided in the embodiment of the application. Each frequency domain vector may represent a law of variation. Since the signal may travel multiple paths from the transmit antenna to the receive antenna as it travels through the wireless channel. Multipath delay causes frequency selective fading, which is a change in the frequency domain channel. Therefore, the variation law of the channel in the frequency domain caused by the time delay on different transmission paths can be represented by different frequency domain vectors.

For convenience of explanation hereinafter, the frequency domain vector is assumed to be denoted as v. The length of the frequency domain vector can be written as N_f，N_fIs more than or equal to 1 and is an integer. The length N of the frequency domain vector is described in detail in the following embodiments_fThe detailed description of the frequency domain vector length is omitted here for the moment.

7. Frequency domain vector set: frequency domain vectors of a variety of different lengths may be included. One or more frequency-domain vectors of the set of frequency-domain vectors are selected for constructing a precoding vector.

In one possible design, the set of frequency domain vectors may include a plurality of frequency domain vectors. The plurality of frequency domain vectors may be orthogonal to each other two by two. Each frequency domain vector in the set of frequency domain vectors may be taken from a Discrete Fourier Transform (DFT) matrix.

For example, the N_fA frequency domain vector may be denoted, for example, as v₁，v₂，……，

. The N is_fThe frequency domain vectors can construct a matrix

In another possible design, the set of frequency domain vectors may be passed through an oversampling factor O_fExpansion to O_f×N_fA frequency domain vector. In this case, the set of frequency domain vectors may include O_fA plurality of subsets, each subset may include N_fA frequency domain vector. N in each subset_fThe frequency domain vectors can be orthogonal to each other two by two. Each subset may be referred to as an orthogonal set. Each frequency domain vector in the set of frequency domain vectors may be taken from an oversampled DFT matrix. Wherein the oversampling factor O _fIs a positive integer.

E.g., the o-th in the set of frequency domain vectors_f(0≤o_f≤O_f-1 and o_fIs an integer) of subsets_fThe frequency domain vectors can be respectively recorded as

Based on the o_fN of the subset_fThe frequency domain vectors may form a matrix

Thus, each frequency domain vector in the set of frequency domain vectors may be taken from a DFT matrix or an oversampled DFT matrix. Each column vector in the set of frequency domain vectors may be referred to as a DFT vector or an oversampled DFT vector. In other words, the frequency domain vector may be a DFT vector or an oversampled DFT vector.

In the embodiment of the present application, the frequency domain vector group may refer to a set of frequency domain vectors formed by two mutually orthogonal vectors in the DFT matrix, or may refer to a subset in the oversampled DFT matrix. In other words, the frequency domain vectors in the frequency domain vector set are mutually orthogonal pairwise. Thus, the set of frequency domain vectors may comprise one or more groups of frequency domain vectors.

8. Spatial domain vector (spatial domain vector): or beam vectors. Each element in the spatial vector may represent a weight of each antenna port. Based on the weight of each antenna port represented by each element in the space-domain vector, signals of each antenna port are linearly superposed, and a region with stronger signals can be formed in a certain direction of space.

For convenience of explanation, the spatial vector is assumed to be denoted as u. The length of the space-domain vector u may be the number of transmit antenna ports N in one polarization direction_s，N_sIs more than or equal to 1 and is an integer. The space vector may be, for example, of length N_sA column vector or a row vector. This is not a limitation of the present application.

The definition of the spatial vector may refer to the two-dimensional (2D) -DFT vector or the oversampled 2D-DFT vector v defined in the type II codebook in NR protocol TS 38.214 version 15(release 15, R15)_l,m. For the sake of brevity, it will not be described in detail herein.

9. Spatial vector set: a plurality of spatial vectors of different lengths may be included to correspond to different numbers of transmit antenna ports. In the embodiment of the present application, the length of the space vector is N_sTherefore, the length of each space domain vector in the space domain vector set to which the space domain vector belongs reported by the terminal device is N_s。

In one possible design, the set of spatial vectors may include N_sA space vector of N_sThe space-domain vectors can be orthogonal to each other two by two. Each spatial vector in the set of spatial vectors may be taken from a two-dimensional (2-dimensional, 2D) -DFT matrix. Wherein 2D may represent two different directions, e.g., a horizontal direction and a vertical direction.

For example, the N_sA space vector may be denoted, for example, as u₁，u₂，……，

. The N is_sThe space vector can construct a matrix B_s，

In another possible design, the set of spatial vectors may be passed through an oversampling factor O_sExpansion to O_s×N_sA spatial vector. In this case, the set of spatial vectors may include O_sA plurality of subsets, each subset may include N_sA spatial vector. N in each subset_sThe space-domain vectors can be orthogonal to each other two by two. Each subset may be referred to as an orthogonal set. Each spatial vector in the set of spatial vectors may be taken from an oversampled 2D-DFT matrix. Wherein the oversampling factor O_sIs a positive integer. Specifically, O_s＝O₁×O₂，O₁May be an oversampling factor in the horizontal direction, O₂May be an oversampling factor in the vertical direction. O is₁≥1，O₂≥1，O₁、O₂Are not 1 at the same time and are integers.

For example, the o-th in the set of spatial vectors_s(0≤o_s≤O_s-1 and o_sIs an integer) of subsets_sThe spatial vectors can be respectively written as

Based on the o_sN of the subset_sThe space vector can construct a matrix

Thus, each spatial vector in the set of spatial vectors may be taken from a DFT matrix or an oversampled DFT matrix. Each column vector in the set of spatial vectors may be referred to as a DFT vector. In other words, the spatial vector may be a DFT vector.

In the embodiment of the present application, the spatial vector group may refer to a set of spatial vectors formed by two mutually orthogonal vectors in the DFT matrix, or may refer to a subset in the oversampled DFT matrix. In other words, every two spatial vectors in the spatial vector group are orthogonal to each other. Thus, the set of spatial vectors may include one or more spatial vector groups.

10. Frequency domain unit: the unit of the frequency domain resource can represent different frequency domain resource granularities. The frequency domain units may include, for example, but are not limited to, subbands, Resource Blocks (RBs), subcarriers, Resource Block Groups (RBGs) or precoding resource block groups (PRGs), etc.

In this embodiment, the precoding matrix corresponding to the frequency domain unit may refer to a precoding matrix determined by performing channel measurement and feedback based on a reference signal on the frequency domain unit. The precoding matrix corresponding to the frequency domain unit may be used to precode data for subsequent transmission through the frequency domain unit. Hereinafter, the precoding matrix or precoding vector corresponding to a frequency domain element may also be simply referred to as the precoding matrix or precoding vector of the frequency domain element.

11. Space-frequency component matrix: a space-frequency component matrix may be determined from a space-frequency vector and a frequency-domain vector. A matrix of space-frequency components may be determined, for example, by a conjugate transpose of a space-domain vector and a frequency-domain vector, e.g., uxv^HDimension may be N_s×N_f。

It should be appreciated that the space-frequency component matrix may be a representation of the space-frequency fundamental unit defined by a space-frequency vector and a frequency-domain vector. The space-frequency basic unit may also be represented, for example, as a space-frequency component vector, which may be determined, for example, by the Kronecker product of a space-domain vector and a frequency-domain vector; the space-frequency basic unit can also be represented as a space-frequency vector pair, for example. The present application is not limited to the specific representation of the space-frequency basic unit. Based on the same concept, those skilled in the art should be able to determine various possible forms from a spatial domain vector and a frequency domain vector within the scope of the present application. In addition, if a different form from the above list is defined for the spatial vector or the frequency domain vector, the operation relationship between the spatial component matrix and the spatial vector or the frequency domain vector may be different. The application does not limit the operation relation between the space-frequency component matrix and the space-domain vector and the frequency-domain vector.

12. Space-frequency matrix: in the embodiment of the present application, the space-frequency matrix may be understood as an intermediate quantity for determining the precoding matrix. For a terminal device, the space-frequency matrix may be determined by a precoding matrix or a channel matrix. For the network device, the space-frequency matrix may be a weighted sum of a plurality of space-frequency component matrices for recovering the downlink channel or the precoding matrix.

As previously mentioned, the space-frequency component matrix may be represented by a dimension N_s×N_fOr the space-frequency matrix can beExpressed as dimension N_s×N_fOf the matrix of (a). The dimension is N_s×N_fThe space-frequency matrix may include N_fEach length being N_sThe column vector of (2). The N is_fThe column vector may be related to N_fEach column vector may be used to determine a precoding vector for the corresponding frequency domain element.

For example, the space-frequency matrix may be denoted as H,

wherein, w₁To

Is and N_fN corresponding to each frequency domain unit_fEach column vector can be N in length_s. The N is_fThe column vectors can be used to determine N respectively_fPrecoding vectors of individual frequency domain units.

It should be understood that the space-frequency matrix is only one expression for determining the intermediate quantity of the precoding matrix, and should not constitute any limitation to the present application. For example, the column vectors in the space-frequency matrix are sequentially connected from the left to the right, or arranged according to other predefined rules, so that the length N can also be obtained _s×N_fMay be referred to as a space-frequency vector.

It should also be understood that the dimensions of the space-frequency matrix and the space-frequency vector shown above are merely examples and should not be construed as limiting the present application in any way. For example, the space-frequency matrix may have a dimension N_f×N_sThe matrix of (2). Each row vector may correspond to a frequency domain unit for determining a precoding vector of the corresponding frequency domain unit.

In addition, when the transmitting antenna is configured with a plurality of polarization directions, the dimension of the space-frequency matrix can be further expanded. For example, for a dual polarized directional antenna, the dimension of the space-frequency matrix may be 2N_s×N_fOr N_f×2N_s. It should be understood that the present application is not limited to the number of polarization directions of the transmit antennas.

13. Channel state information reference signal (CSI-RS): the method can be used for downlink channel measurement, interference measurement and the like. In the embodiment of the present application, the CSI-RS is mainly used for downlink channel measurement. The network device may transmit the CSI-RS on pre-configured time-frequency resources. The terminal device may receive the CSI-RS on the preconfigured time-frequency resource, so as to perform downlink channel measurement according to the received CSI-RS.

It should be understood that the CSI-RS is only one possible reference signal for channel measurement and should not constitute any limitation to the present application. This application does not exclude the possibility of defining other reference signals in future protocols that may be used to implement the same or similar functionality.

14. Reporting bandwidth (reporting band): in this embodiment of the present application, the reporting bandwidth may refer to a bandwidth corresponding to a reporting bandwidth (CSI-reporting band) field in CSI reporting configuration (CSI-reporting configuration) of a network device through an Information Element (IE). When the network device indicates the sub-band to be reported through the csi-reporting band, the bandwidth corresponding to the csi-reporting band may be a reporting bandwidth.

The terminal device may receive the CSI-RS over the reporting bandwidth for channel measurement and reporting. In this embodiment of the present application, the reporting bandwidth may be a frequency bandwidth occupied by CSI-RS based on which the terminal device performs CSI reporting once.

In one implementation, the reporting bandwidth may be a frequency domain occupied bandwidth of the CSI-RS resource. The frequency domain occupied bandwidth of the CSI-RS resource may be configured by an IE CSI-frequency occupied bandwidth (CSI-frequency occupancy).

The network device may further indicate the number and location of subbands (i.e., an instance of a frequency domain unit) to be reported via the csi-ReportingBand field. This field may be a bitmap. The length of the bitmap may be the number of sub-bands included in the reported bandwidth. In other words, the bandwidth occupied by the first indicator bit to the last indicator bit in the bitmap may be the reported bandwidth. Each indication bit in the bitmap may correspond to a subband in the reporting bandwidth. Each indication bit is used for indicating whether the corresponding subband needs to report the CSI. For example, when the indication bit is "1", the corresponding subband needs to report CSI; when the indication bit is "0", the corresponding subband does not need to report the CSI. It should be understood that the values of the indicator bits recited herein are meant to be exemplary only and should not be construed as limiting the application in any way.

It should be understood that the above-listed signaling for configuring the reporting bandwidth and the signaling for indicating the sub-band to be reported are only examples, and should not constitute any limitation to the present application. The signaling for indicating the reporting bandwidth, the signaling for indicating the sub-band to be reported and the specific indication mode are not limited in the present application.

It should also be understood that the above description of reporting bandwidth is merely exemplary for ease of understanding, and should not be construed as limiting the present application in any way.

In addition, the following description is made for the purpose of facilitating understanding of the embodiments of the present application.

First, for the convenience of understanding and explanation, the main parameters involved in the present application are first described as follows:

N_f: length of frequency domain vector, N_fNot less than 1 and is an integer;

N_s: length of space-domain vector, N_sNot less than 1 and is an integer;

m: reporting number of frequency domain vectors, wherein M is more than or equal to 1 and is an integer;

l: reporting number of space domain vectors, wherein L is more than or equal to 1 and is an integer;

k: the reporting number of the weighting coefficients, K is more than or equal to 1 and is an integer;

r: the number of transmission layers, R is not less than 1 and is an integer.

Second, in the embodiments of the present application, for convenience of description, when numbering is referred to, numbering may be continued from 0. For example, the R transport layers may include a 0 th transport layer to an R-1 th transport layer; for another example, the L spatial vectors may include the 0 th spatial vector to the L-1 st spatial vector, and so on, which are not illustrated herein. Of course, the specific implementation is not limited to this, and for example, the numbers may be sequentially numbered from 1. It should be understood that the above descriptions are provided for convenience of describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.

Third, in the embodiments of the present application, a plurality of places involve transformation of matrices and vectors. For ease of understanding, a unified description is provided herein. The superscript T denoting transposition, e.g. A^TRepresents a transpose of a matrix (or vector) a; the superscript H denotes a conjugate transpose, e.g., A^HRepresenting the conjugate transpose of matrix (or vector) a. Hereinafter, for the sake of brevity, the description of the same or similar cases is omitted.

Fourthly, in the embodiments shown below, the embodiments provided in the present application are described by taking the case where the space domain vector and the frequency domain vector are both column vectors, but this should not limit the present application in any way. Other more possible manifestations will occur to those skilled in the art based on the same idea.

Fifth, in the embodiments of the present application, "for indicating" may include for direct indication and for indirect indication. For example, when a certain indication information is described as the indication information I, the indication information may be included to directly indicate I or indirectly indicate I, and does not necessarily represent that I is carried in the indication information.

If the information indicated by the indication information is referred to as information to be indicated, in a specific implementation process, there are many ways of indicating the information to be indicated, for example, but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or an index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein an association relationship exists between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other part of the information to be indicated is known or predetermined. For example, the indication of the specific information may be implemented by means of a predetermined arrangement order of the respective information (e.g., protocol specification), thereby reducing the indication overhead to some extent. Meanwhile, the universal parts of all information can be identified and indicated in a unified mode, so that the indication overhead caused by independently indicating the same information is reduced. For example, it will be appreciated by those skilled in the art that the precoding matrix is composed of precoding vectors, and that each precoding vector in the precoding matrix may have identical portions in terms of composition or other attributes.

In addition, the specific indication method may be any of various existing indication methods, such as, but not limited to, the above indication methods, various combinations thereof, and the like. For the details of various indication modes, reference may be made to the prior art, and details are not described herein. As described above, when a plurality of information items of the same type are required to be indicated, different indication manners of different information items may occur. In a specific implementation process, a required indication manner may be selected according to a specific need, and the indication manner selected in the embodiment of the present application is not limited, so that the indication manner related to the embodiment of the present application should be understood to cover various methods that enable a party to be indicated to obtain information to be indicated.

In addition, other equivalent forms of the information to be indicated may exist, for example, a row vector may be represented as a column vector, a matrix may be represented by a transposed matrix of the matrix, a matrix may also be represented as a vector or an array, the vector or the array may be formed by connecting each row vector or column vector of the matrix, a kronecker product of two vectors may also be represented as a product of one vector and a transposed vector of another vector, and the like. The technical solutions provided in the embodiments of the present application should be understood to cover various forms. For example, reference to some or all of the features in the embodiments of the present application should be understood to encompass various manifestations of such features.

The information to be indicated may be sent together as a whole, or may be sent separately by dividing into a plurality of pieces of sub information, and the sending periods and/or sending timings of these pieces of sub information may be the same or different. Specific transmission method this application is not limited. The sending period and/or sending timing of these sub information may be predefined, for example, predefined according to a protocol, or may be configured by the transmitting end device by sending configuration information to the receiving end device. The configuration information may include, for example and without limitation, one or a combination of at least two of radio resource control signaling, such as RRC signaling, MAC layer signaling, such as MAC-CE signaling, and physical layer signaling, such as Downlink Control Information (DCI).

Sixth, the definitions listed herein for many characteristics (e.g., kronecker product, CSI, PMI, frequency domain unit, two-domain compression, spatial vector, frequency domain vector, CSI-RS resource, etc.) are only used to explain the function of the characteristics by way of example, and the details thereof may be referred to the prior art.

Seventh, in the embodiments shown below, the first, second, third, fourth and various number numbers are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. For example, different thresholds, different indication information, etc. are distinguished.

Eighth, in the embodiments shown below, "predefined" may be implemented by saving corresponding codes, tables, or other manners that may be used to indicate relevant information in advance in a device (for example, including a terminal device and a network device), and the present application is not limited to a specific implementation manner thereof. Wherein "saving" may refer to saving in one or more memories. The one or more memories may be separate devices or may be integrated in the encoder or decoder, the processor, or the communication device. The one or more memories may also be provided as a portion of a stand-alone device, a portion of which is integrated into a decoder, a processor, or a communication device. The type of memory may be any form of storage medium and is not intended to be limiting of the present application.

Ninth, the "protocol" referred to in the embodiments of the present application may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and a related protocol applied in a future communication system, which is not limited in the present application.

Tenth, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, and c, may represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a, b and c. Wherein a, b and c may be single or plural respectively.

The following describes in detail a vector indication method for constructing a precoding vector according to an embodiment of the present application with reference to the drawings.

It should be understood that the methods provided by the embodiments of the present application may be applied to systems that communicate via multiple antenna techniques, such as the communication system 100 shown in fig. 1. The communication system may include at least one network device and at least one terminal device. The network device and the terminal device can communicate through a multi-antenna technology.

It should also be understood that the embodiments shown below do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application, as long as the communication can be performed according to the method provided by the embodiments of the present application by running the program recorded with the code of the method provided by the embodiments of the present application, for example, the execution subject of the method provided by the embodiments of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

Hereinafter, without loss of generality, the vector indication method for constructing a precoding vector provided by the embodiment of the present application is described in detail by taking interaction between a network device and a terminal device as an example.

Fig. 2 is a schematic flow chart of a vector indication method 200 for constructing a precoding vector provided by an embodiment of the present application, which is shown from the perspective of device interaction. As shown, the method 200 may include steps 210 through 250. The individual steps in the method are explained in detail below.

In step 210, the terminal device generates first indication information indicating one or more frequency domain vectors. The one or more frequency domain vectors may be used to construct a precoding vector for one or more frequency domain elements in a group of frequency domain elements.

Specifically, the one or more frequency domain vectors indicated by the first indication information may be frequency domain vectors determined by the terminal device based on channel measurement performed by the frequency domain unit group and reported to the network device. In other words, the one or more frequency domain vectors indicated by the first indication information are the frequency domain vectors to be reported, or the selected frequency domain vectors.

The length N of the frequency domain vector reported based on the frequency domain unit group_fThe number Q of frequency domain units included in the bandwidth from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group can be determined. Thus, the terminal device may first determine one or more frequency domain cell groups from the reported bandwidth. For each frequency domain unit group, the terminal device may determine the length of the frequency domain vector according to the position of the frequency domain unit to be reported in the frequency domain unit group, and further determine the frequency domain vector to be reported from the corresponding frequency domain vector set.

As previously described, the network device may transmit CSI-RS on the frequency domain elements contained in the reporting bandwidth. The terminal device may feed back CSI to some or all of the frequency domain units according to the indication of the network device. The frequency domain unit indicated by the network device and requiring CSI feedback may be referred to as a frequency domain unit to be reported or a frequency domain unit to be fed back.

For example, the frequency domain unit to be reported may be a sub-band to be reported indicated by the network device through the csi-reporting band, or may be a frequency domain unit of another granularity corresponding to the sub-band to be reported. Here, corresponding to the sub-band to be reported, it may mean that the frequency band occupied by the frequency domain unit to be reported on the frequency domain resource is the same as the frequency band occupied by the sub-band to be reported, but the reporting granularity may be different. For the description of the frequency domain unit to be reported, refer to the related description in conjunction with fig. 3 to fig. 5.

In this embodiment, one frequency domain unit group may include one or more frequency domain units to be reported. The bandwidth occupied by a frequency domain unit group may be part or all of the reporting bandwidth. In other words, one frequency domain unit group may be a subset of the reporting bandwidth.

For each frequency domain unit group, the terminal equipment can determine the frequency domain vector to be reported by the method provided by the application. Therefore, after receiving the configuration signaling of the reporting bandwidth, the terminal device may determine the frequency domain unit groups first, and then determine the frequency domain vectors to be reported based on each frequency domain unit group.

In this embodiment, without loss of generality, a specific process of determining and reporting a frequency domain vector by a terminal device is described in detail by taking a frequency domain unit group as an example.

Optionally, the method 200 further comprises: and the terminal equipment determines a frequency domain unit group from the reported bandwidth.

In a possible implementation manner, the terminal device may determine the frequency domain unit group from the reporting bandwidth according to a predefined rule. For example, the protocol may predefine rules that determine groups of frequency domain units from the reporting bandwidth.

The rule may be, for example, that all frequency domain units in the reporting bandwidth are taken as one frequency domain unit group. After receiving the configuration signaling of the reporting bandwidth, the terminal device may use all the reporting bandwidth as the frequency domain unit group to determine the frequency domain vector to be reported, as described above for CSI-frequency occupancy.

Fig. 3 shows an example of frequency domain cell groups and reporting bandwidth. As shown, fig. 3 shows a reported bandwidth including 40 frequency domain units. Each hatched square in the figure

Representing a frequency domain unit to be reported.

The bandwidth occupied by the frequency domain unit group shown in fig. 3 is the entire bandwidth of the reporting bandwidth. That is, the frequency domain unit group includes 40 frequency domain units, and there are 29 frequency domain units to be reported. The rule may be, for example, that when the number of frequency domain units spaced between two adjacent frequency domain units to be reported in the reporting bandwidth is greater than or equal to a preset threshold, the reporting bandwidth is divided into two parts from between the two adjacent frequency domain units to be reported, and the two parts belong to two frequency domain unit groups respectively. Wherein the threshold may be predefined, such as protocol definition, for example.

The rule may also be, for example, that when a ratio of the number of frequency domain units spaced between two adjacent frequency domain units to be reported in the reporting bandwidth to the number of all frequency domain units to be reported in the reporting bandwidth is greater than or equal to a certain threshold, the reporting bandwidth is divided into two sections from between the two adjacent frequency domain units to be reported, and the two sections belong to two frequency domain unit groups respectively. Wherein the threshold may be predefined, such as protocol definition, for example.

After receiving the configuration signaling of the reporting bandwidth, the terminal device may further determine whether the frequency domain units to be reported in the reporting bandwidth are continuous. In case of poor continuity, the reporting bandwidth may be divided into two or more frequency domain element groups.

Fig. 4 shows an example of the division of the reporting bandwidth into two frequency domain unit groups. As shown, fig. 4 shows a reported bandwidth including 40 frequency domain units. Each hatched square in the figure

Representing a frequency domain unit to be reported.

The bandwidth occupied by the frequency domain unit group shown in fig. 4 is a part of the bandwidth of the reporting bandwidth. Fig. 4 shows two frequency domain unit groups, where one frequency domain unit group includes 18 frequency domain units, and there are 12 frequency domain units to be reported; the other frequency domain unit group comprises 11 frequency domain units, wherein 8 frequency domain units to be reported are available.

It should be understood that fig. 4 is only an example, and the reporting bandwidth may also be divided into more frequency domain unit groups according to the number of frequency domain units spaced between two adjacent frequency domain units to be reported.

It should also be understood that the above merely illustrates, for ease of understanding, several rules that may be used to determine groups of frequency domain cells. This should not be construed as limiting the application in any way. For example, the rule may further include dividing the reporting bandwidth into two or more segments from between two adjacent frequency domain units to be reported, and removing the frequency domain units that do not need to be reported at the head and the tail of each segment to form two or more frequency domain unit groups, when the number of frequency domain units spaced between the two adjacent frequency domain units to be reported is greater than or equal to a preset threshold. For example, the left frequency domain unit group in fig. 4 may not include the first frequency domain unit that does not need to be reported, and the right frequency domain unit group may not include the last frequency domain unit that does not need to be reported. The present application does not limit the specific rules for determining the set of frequency domain cells.

It should be further understood that fig. 3 and fig. 4 are only shown for facilitating understanding of the relationship between the frequency domain unit groups and the reporting bandwidth, and the granularity of the frequency domain units in the frequency domain unit groups is the same as that of the reporting bandwidth, but this should not limit the present application in any way. The present application does not limit the size relationship between the granularity of the frequency domain unit in the frequency domain unit group and the granularity of the frequency domain unit in the reporting bandwidth. For example, the granularity of the frequency domain units in the frequency domain unit group exemplified later in connection with fig. 5 is different from the granularity of the frequency domain units in the reporting bandwidth.

In another possible implementation manner, the protocol may be predefined, and the reporting bandwidth is equally divided into a plurality of frequency domain unit groups, and the number of frequency domain units included in each frequency domain unit group is the same.

In another possible implementation manner, the terminal device may determine the frequency domain unit group from the reported bandwidth according to an indication of the network device. For example, the network device may indicate the terminal device through signaling, and the currently configured reporting bandwidth may include several frequency domain unit groups and the frequency domain unit included in each frequency domain unit group.

It should be understood that the specific methods listed above for determining the frequency domain cell groups are only examples and should not constitute any limitation to the present application. The present application does not limit the specific method for determining the frequency domain unit group from the reported bandwidth.

The frequency domain unit to be reported in the reporting bandwidth can be notified to the terminal device by the network device through a signaling.

Optionally, the method 200 further comprises: in step 220, the terminal device receives second indication information, where the second indication information may be used to indicate the location and number of frequency domain units to be reported in the reporting bandwidth. Accordingly, the network device transmits the second indication information.

In one possible design, the second indication information may be CSI-reporting band in the IE CSI-reporting config. That is, the network device may indicate the sub-band to be reported through the csi-reporting band. As described above, the csi-reporting band may specifically be a bitmap with a length equal to the number of subbands included in the reporting bandwidth, so as to indicate, through each indication bit in the bitmap, whether the corresponding subband is a subband to be reported. Since the csi-reporting band has been described in detail above, it is not described herein again for brevity.

If the granularity of the frequency domain unit based on which the terminal device reports the first indication information is a sub-band, the number of the frequency domain units to be reported may be equal to the number of the sub-bands to be reported, which is indicated by the csi-reporting band. If the granularity of the frequency domain unit based on which the terminal device reports the first indication information is smaller than the granularity of the sub-band, the number of the frequency domain units to be reported may be greater than the number of the sub-band indicated by the csi-reporting band. For example, the number of frequency domain units to be reported may be an integer multiple of the number of sub-bands to be reported indicated by csi-reporting band. Alternatively, each sub-band may include an integer multiple of the number of Resource Blocks (RBs) included in each frequency domain unit. If a ratio of the granularity of the subband to the granularity of the frequency domain unit based on which the first indication information is reported is denoted as α, α may be an integer greater than or equal to 1.

It should be noted that all the frequency domain resources corresponding to the sub-band to be reported indicated by the CSI-reporting band need to report the CSI. Therefore, the network device indicates the sub-band to be reported through the csi-reporting band, and also indicates the frequency domain unit to be reported. Only the granularity of the frequency domain unit on which the terminal device reports the first indication information may be a subband or other granularities. In other words, regardless of whether the granularity of the frequency domain unit indicated by the second indication information is the same as the granularity of the frequency domain unit based on which the first indication information is reported, the terminal device may determine the position and the number of the frequency domain units to be reported according to the second indication information. In the embodiment of the present application, for convenience of understanding, the granularity of the frequency domain unit to be reported and the granularity of the frequency domain unit based on which the first indication information is reported are defined as the same granularity.

Fig. 5 shows an example of the second indication information, the reported bandwidth, and the frequency domain unit group. As shown in the figure, the second indication information may indicate the number and the position of the sub-bands to be reported through a bitmap. The reporting bandwidth shown in the figure may include at least 10 sub-bands, and the ellipses in the figure may represent one or more sub-bands. Each subband may correspond to an indication bit in the bitmap. The sub-band corresponding to the bit with the indication bit of "1" may be a sub-band to be reported. The frequency domain unit group may occupy part or all of the reported bandwidth. The frequency domain unit group shown in the figure occupies part of the bandwidth of the reported bandwidth. The granularity of the frequency domain elements in the set of frequency domain elements may be smaller than the sub-bands. The granularity of the frequency domain elements shown in the figure is 1/4 for the sub-band granularity. In other words, the number of RBs included in each sub-band may be 4 times the number of RBs included in each frequency domain unit to be reported. I.e., α is 4. In the frequency domain unit group, the number Q of frequency domain units included in the bandwidth occupied by the frequency domain unit to be reported from the first frequency domain unit to the last frequency domain unit to be reported may be represented by the formula Q ═ α (N) ₂-N₁-1)+M₁+M₂And (4) determining. Wherein N is₂The sequence number N of the sub-band to be reported corresponding to the last frequency domain unit to be reported in the reporting bandwidth in the frequency domain unit group₁A serial number M of the sub-band to be reported corresponding to the first frequency domain unit to be reported in the reporting bandwidth₁Indicates the number of frequency domain units to be reported, M, contained in the first sub-band to be reported₂Representing the number of frequency domain units to be reported contained in the last sub-band to be reported; n is a radical of₁≥1，N₂≥1，M₁≥1，M₂Not less than 1 and N₁、N₂、M₁And M₂Are all integers.

Here, M is introduced₁And M₂The reason is to consider that when the first frequency domain unit to be reported is exactly the first sub-band in the reporting bandwidth, or the last frequency domain unit to be reported is exactly the last sub-band in the reporting bandwidth, a ratio of a granularity of the first sub-band or the last sub-band of the reporting bandwidth to a granularity of a frequency domain unit on which the first indication information is reported may not be α. For example, M₁≤α，M₂≤α。

If M is₁α and M₂α, then N in the reporting bandwidth shown in fig. 5₂＝5，N₁＝1，Q＝20。

It should be understood that the above-described calculation formula for determining the Q value is merely an example, and should not limit the present application in any way. For example, the Q value may also be represented by the sequence number N of the last frequency domain unit to be reported in the frequency domain unit group ₂'and the first frequency domain unit to be reported's serial number N₁' determination, e.g., Q ═ N₂'-N₁'+1. Wherein, N₁'≥1，N₂' is not less than 1, and N₁' and N₂' are integers. It can be understood that when the granularity of the frequency domain unit is the same as the granularity of the sub-band, α ═ 1, i.e., N₁'＝N₁，N₂'＝N₂，Q＝N₂-N₁+1. For example, in the frequency domain cell group shown in fig. 3, the Q value is 38. For another example, in the two frequency domain cell groups shown in fig. 4, the Q values are 17 and 10, respectively.

It should also be understood that fig. 5 is merely an example for ease of understanding and should not constitute any limitation on the present application. The granularity of the frequency domain unit to be reported, the size relationship between the granularity of the frequency domain unit to be reported and the granularity of the sub-band, the relationship between the frequency domain unit group and the reporting bandwidth, and the number of the sub-bands (namely, the length of the bitmap) included in the reporting bandwidth are not limited.

It should be further understood that the number of each sub-band in the frequency domain occupied bandwidth of the reporting bandwidth shown in fig. 5 is only an example, and should not limit the present application in any way. For example, each sub-band in the frequency domain occupied bandwidth of the reporting bandwidth may be numbered from 1, or may be numbered from another value. No matter how the number is numbered, the number of the sub-bands included in the bandwidth from the first sub-band to be reported to the last sub-band to be reported is not changed, or the number Q of the frequency domain units included in the bandwidth from the first sub-band to be reported to the last sub-band to be reported is not changed.

It should also be understood that the above-listed CSI-reporting band in the IE CSI-reporting config is only an example of the second indication information and should not constitute any limitation to the present application. The present application does not exclude the possibility of indicating the number and the location of the frequency domain units to be reported through other existing signaling or through a newly added signaling. And when the number and the position of the frequency domain units to be reported are indicated through the existing signaling or the newly added signaling, the indication can be based on the granularity which is the same as or different from the granularity of the frequency domain units to be reported. This is not a limitation of the present application.

As previously mentioned, the length N of the frequency domain vector_fThe number Q of frequency domain units included in the bandwidth from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group can be determined.

Alternatively, N_f＝Q。

The set of frequency domain vectors may be predefined in sets of frequency domain vectors of different lengths. When the terminal device determines the Q value, the frequency domain vector with the length equal to the Q value can be directly selected from the frequency domain vector set for reporting.

For example, in the set of frequency domain cells shown in fig. 3, if the Q value is 38, then a frequency domain vector of length 38 may be selected. For another example, in the frequency domain cell group shown in fig. 4, if the Q values are 17 and 10, respectively, frequency domain vectors having lengths of 17 and 10 may be selected, respectively. For another example, in the set of frequency domain units shown in fig. 5, if the Q value is 20, a frequency domain vector of length 20 may be selected.

Alternatively, N_f＞Q。

It is also possible to define only a set of frequency domain vectors of a certain length in the set of frequency domain vectors. When the terminal device determines the Q value, a frequency domain vector having a length greater than the Q value may be selected from the set of frequency domain vectors.

For example, the set of frequency domain vectors may define frequency domain vectors of lengths {4, 8, 12, 24, 48}, respectively. When the Q value determined by the terminal device according to the position of the frequency domain unit to be reported in the frequency domain unit group does not belong to the listed length set, a frequency domain vector with a length greater than the Q value may be selected.

For example, in the set of frequency domain cells shown in fig. 3, a frequency domain vector of length 48 may be selected if the Q value is 38. For another example, in the frequency domain cell group shown in fig. 4, if the Q values are 17 and 10, respectively, frequency domain vectors having lengths of 24 and 12 may be selected, respectively. For another example, in the set of frequency domain cells shown in fig. 5, if the Q value is 20, a frequency domain vector of length 24 may be selected.

It should be understood that the Q values and the lengths of the frequency domain vectors listed above are merely examples for ease of understanding and should not be construed as limiting the present application in any way. In addition, when the granularity of the frequency domain unit in the reporting bandwidth indicated by the second indication information is different from the granularity of the frequency domain unit in the frequency domain unit group based on which the first indication information is reported, the Q value may be defined to correspond to the granularity of the frequency domain unit to be reported, or may correspond to the granularity of the frequency domain unit in the reporting bandwidth (for example, the above-mentioned sub-band) configured by the signaling. This is not a limitation of the present application.

For convenience of description, it is assumed that the granularity of the frequency domain unit in the reporting bandwidth is the same as the granularity of the frequency domain unit based on which the first indication information is reported. E.g., all subbands. It should be understood that this should not constitute any limitation to the present application.

After the length of the frequency domain vector is determined, the terminal equipment can further determine the frequency domain vector to be reported.

Optionally, the terminal device determines the frequency domain vector to be reported based on each transport layer. That is, the frequency domain vectors used to determine the precoding vectors for each frequency domain element on each transmission layer may be independent of each other.

In one implementation, the terminal device may perform channel measurement based on a reference signal, such as a CSI-RS, received on the frequency domain unit group to determine a precoding vector corresponding to each frequency domain unit in the frequency domain unit group on each transmission layer. It should be understood that, for a specific method for determining a precoding vector corresponding to each frequency domain unit on each transmission layer based on channel measurement, reference may be made to the prior art, and for brevity, a detailed description of the specific process is omitted here.

The terminal equipment can construct a space-frequency matrix corresponding to the transmission layer according to the pre-coding vectors of all frequency domain units on the same transmission layer, and can determine the frequency domain vector to be reported by performing space-domain and frequency-domain DFT on the space-frequency matrix. The DFT of the space-frequency matrix in the space domain and the frequency domain may be represented by the formula C ═ B _s ^HH_rB_fTo achieve the same. Wherein H_rAnd representing a space-frequency matrix constructed by precoding vectors corresponding to each frequency domain unit on the R (R is more than or equal to 0 and less than or equal to R-1) transmission layer in the R transmission layers. B_sRepresenting a matrix constructed from a set of spatial vectors from a predefined set of spatial vectors. B is_fRepresenting a matrix constructed from a set of frequency domain vectors from a predefined set of frequency domain vectors. In the embodiment of the present application, the length of each frequency domain vector in the set of frequency domain vectors may be determined by the method described above. C denotes a coefficient matrix obtained by DFT.

It should be noted that, for convenience of understanding only, a specific process of the terminal device performing spatial and frequency domain DFT on the space-frequency matrix to determine the frequency domain vector and the spatial vector and the weighting coefficient, which are described later, is described by taking a set of spatial vectors in the set of spatial vectors and a set of frequency domain vectors in the set of frequency domain vectors as an example. When the space-domain vector set includes a plurality of space-domain vector sets or the frequency-domain vector set includes a plurality of frequency-domain vector sets, the terminal device performs spatial and frequency-domain DFT on the space-frequency matrix to determine the frequency-domain vectors and the space-domain vectors and the weighting coefficients described below, which are similar to the above-mentioned specific processes, and reference may be made to the prior art. A detailed description of this particular process is omitted here for the sake of brevity.

The terminal device can determine the stronger column or columns, e.g. M, from the coefficient matrix C_rAnd (4) respectively. M is a group of_rIs more than or equal to 1 and is an integer. The terminal device may, for example, be based on the column elements in the coefficient matrix CThe square sum size of the modulus of the element determines the one or more columns of the modulus that are larger. The stronger M in the coefficient matrix C_rThe columns may be used to determine a selected one or more of the set of frequency domain vectors. E.g., stronger M in coefficient matrix C_rThe sequence number of each column can be a matrix B constructed by a frequency domain vector set_fM selected in_rThe sequence number of each column vector. Therefore, the frequency domain vector reported for the r-th transport layer can be determined based on the space-frequency matrix corresponding to the r-th transport layer.

The number of the frequency domain vectors to be reported may be indicated by the network device through signaling, or may be determined by the terminal device and reported to the network device, or may be predefined, for example, defined by a protocol. This is not a limitation of the present application.

It should be noted that, when the number of frequency domain units to be reported is less than the length N of the frequency domain vector_fThe space frequency matrix can be zero-padded. For example, if the number of frequency domain units to be reported is N_sb，N_f＞N_sbIs not less than 1 and is an integer. The dimension of the space-frequency matrix is N _t×N_sbN may be filled in the matrix_f－N_sbColumn zero elements to obtain dimension N_t×N_fFor performing DFT. The terminal equipment and the network equipment can agree to N in advance_f－N_sbColumn zero element filling in N of space-frequency matrix_sbBefore or after the column. For example, the terminal device may assign N to the number_f－N_sbColumn zero element filling in N of space-frequency matrix_sbAfter the column, after receiving the first indication information fed back by the terminal device, the network device may set the dimension restored according to the first indication information as N_t×N_fFirst N of the matrix of_sbExtracting the rows to obtain the dimension N_t×N_sbThe space-frequency matrix of (c).

It is to be understood that the list herein is given at N_f＞N_sbThe method for determining the frequency domain vector to be reported by the terminal device is only an example, and should not be limited in any way in this application. Terminal equipment determines concrete frequency domain vector to be reportedThe method and the specific method for recovering the precoding vector by the network device belong to internal implementation behaviors, and the method is not limited in the application.

After determining the frequency domain vector to be reported, the terminal device may further generate indication information of the frequency domain vector to be reported. The terminal device may indicate the frequency domain vector to be reported by using, for example, an index of the combination of the frequency domain vectors in the frequency domain vector set, may indicate each frequency domain vector by using an index of each frequency domain vector to be reported, and may indicate the frequency domain vector to be reported by using a bitmap, which is not limited in this application. The specific way for the terminal device to report the frequency domain vector may refer to the prior art, for example, the specific way for the terminal device to report the space domain vector in the feedback way of the type II codebook may be referred to.

Further, the first indication information may also be used to indicate one or more spatial vectors.

The space vector and the weighting coefficient reported for the r-th transmission layer may be determined by the coefficient matrix C obtained by the DFT. For example, the terminal device may determine one or more stronger rows from the coefficient matrix C to determine one or more spatial vectors, e.g., L_rA, L_rIs more than or equal to 1 and is an integer. Stronger L in the coefficient matrix C_rThe serial number of each row can be a matrix U constructed by a space-domain vector set_sIs selected L in_rThe sequence number of each column vector.

The number of the space vectors to be reported may be indicated by the network device through signaling, or may be determined by the terminal device and reported to the network device, or may be predefined, such as protocol definition. This is not a limitation of the present application.

After the terminal device determines the space vector to be reported, the terminal device may further generate indication information of the space vector to be reported. The terminal device may indicate the space vector to be reported through an index of a combination of the space vectors in the space vector set, may indicate each space vector through an index of each space vector to be reported, and may indicate the space vector to be reported through a bitmap, which is not limited in this application. The specific mode of reporting the space vector by the terminal device may refer to the prior art, for example, the specific mode of reporting the space vector by the terminal device in the feedback mode of the type II codebook may be referred to.

It should be understood that the one or more spatial vectors may be determined by the terminal device based on channel measurement, or may be pre-configured, for example, the protocol may pre-define that some or all spatial vectors in the set of spatial vectors are used to construct the space-frequency matrix; alternatively, the determination may be made by the network device, e.g., the network device may determine one or more space vectors based on reciprocity of the uplink and downlink channels. The present application does not limit the manner of determining the spatial vector.

Further, the first indication information may also be used to indicate one or more weighting coefficients.

In addition, the stronger M in the coefficient matrix C_rColumn and stronger L_rThe dimension of each row capable of being constructed is L_r×M_rThe coefficient matrix C' of (a). L in the coefficient matrix C_r×M_rEach element is a weighting coefficient. Wherein, the first_rLine m_rColumn element of_rA space vector sum m_rAnd weighting coefficients of a space-frequency component matrix constructed by the frequency domain vectors. Wherein l is more than or equal to 0_r≤L_r－1，0≤m_r≤M_r－1，l_rAnd m_rAre all integers.

It is to be understood that one or more elements of the coefficient matrix C' may be included in which the quantized value of the amplitude is zero. For one or more elements with zero quantized value of the amplitude, the terminal device may not report.

Further, the number of reported weighting factors may be configured in advance, for example, predefined, such as a protocol definition, or indicated by signaling through the network device. This is not a limitation of the present application. The number of reports of weighting factors can be written as K, for example_r，1≤K_r≤L_r×M_rAnd K is_rAre integers. The K is_rThe weighting coefficients may be L in the coefficient matrix C_r×M_rA subset of individual elements. In other wordsL is as described above_rA space vector sum M_rL constructed by frequency domain vector_r×M_rSome or all of the space-frequency component matrices may be used for weighted summation to obtain a weighting coefficient corresponding to the r-th transmission layer.

It should be understood that, since the coefficient matrix C' may include one or more elements with smaller amplitudes, for example, quantized values of the amplitudes are zero or close to zero, the number of weighting coefficients actually reported by the terminal device may be K_rAnd may be smaller than K_rThis is not a limitation of the present application.

After determining the weighting coefficients to be reported, the terminal device may further generate indication information of the weighting coefficients to be reported. The terminal device may indicate the weighting factor by way of normalization, for example, which is not limited in this application. The specific way for the terminal device to report the weighting factor may refer to the prior art, for example, the specific way for the terminal device to report the weighting factor in the feedback way of the type II codebook may be referred to.

It should be understood that, for the sake of understanding only, the specific process of determining spatial vectors, frequency domain vectors and corresponding weighting coefficients by the terminal device is described in detail by taking the r-th transmission layer as an example. This should not be construed as limiting the application in any way. The specific method for the terminal device to determine the spatial vector, the frequency domain vector and the corresponding weighting coefficient is not limited to the above. The terminal device may also determine the spatial domain vector, the frequency domain vector and the corresponding weighting coefficient by using an existing estimation method, such as a multiple signal classification algorithm (MUSIC), a Bartlett (Bartlett) algorithm, or a rotation invariant subspace algorithm (ESPRIT).

Optionally, the terminal device determines one or more frequency domain vectors that may be shared based on the R transport layers. That is, the frequency domain units used to determine the precoding vectors for each frequency domain unit on each transmission layer may be common. The frequency domain vectors determined for any two transmission layers may be the same. For example, M (M ≧ 1 and integer) frequency-domain vectors.

When the R transmission layers share one or more frequency domain vectors, the terminal device may determine the one or more frequency domain vectors according to the space-frequency matrices corresponding to the R transmission layers, respectively. The specific method for the terminal device to determine the frequency domain vector to be reported based on R transport layers may be similar to that described above, or refer to the prior art. For brevity, no further description is provided herein.

The R transport layers may share one or more spatial vectors. For example, L (L ≧ 1 and an integer) space vectors. The terminal device may determine L space vectors according to the space-frequency matrices corresponding to the R transmission layers. The specific method for the terminal device to determine the space vector to be reported based on the R transport layers may be similar to the above, or refer to the prior art. For brevity, no further description is provided herein.

The specific method for determining the weighting coefficient by the terminal device is similar to that described above, and for brevity, the detailed description is omitted here.

And, the number of reported weighting coefficients can be configured in advance. Since this has already been explained in detail above, it is not repeated here for the sake of brevity.

Optionally, the terminal device determines one or more frequency domain vectors based on each spatial domain vector. That is, the frequency domain vectors used to construct the matrix of space-frequency components with different space-domain vectors may be independent of each other.

The terminal device may determine one or more frequency domain vectors from each spatial domain vector. For example, the terminal device may determine one or more frequency domain vectors corresponding to each spatial domain vector by performing spatial and frequency domain DFT on the spatial frequency matrix. The DFT of the terminal device for the space domain and the frequency domain of the space-frequency matrix can be represented by the formula C ═ u_s ^HH_rB_fTo be implemented. Wherein u is_sRepresenting a spatial vector, whereby the stronger one or more frequency domain vectors determined are associated with spatial vector u_sThe corresponding frequency domain vector. The specific method for determining the stronger one or more frequency domain vectors by the terminal device is similar to that described above, and for brevity, will not be described here again.

Wherein the spatial vector may be determined by the terminal device based on channel measurements. Optionally, the first indication information is further used for indicating one or more spatial vectors. The spatial vector may be indicated by the network device or may be predefined, which is not limited in this application.

And, the number of reported weighting coefficients can be configured in advance. Since the above has been described in detail, the details are not repeated herein for the sake of brevity.

Furthermore, the terminal device may also determine and report the wideband amplitude coefficient for each space vector separately. In this case, the first indication information may also be used to indicate a wideband magnitude coefficient for each of the one or more spatial vectors. The specific method for determining the wideband amplitude coefficient for each space domain vector by the terminal device may refer to the prior art, and for brevity, no further description is given here.

It should be understood that the present application is not limited to the correspondence relationship between the frequency domain vector and the spatial domain vector, the correspondence relationship between the frequency domain vector and the transmission layer, and the specific determination manner of the frequency domain vector. The method for reporting the space domain vector, the frequency domain vector and the weighting coefficient by the terminal equipment is not limited in the application. The number of space domain vectors, the number of frequency domain vectors and the number of weighting coefficients reported by the terminal equipment are not limited.

Based on the method, the terminal device may determine and generate the first indication information to be reported.

However, in some cases, the distribution of frequency domain elements to be reported in the report bandwidth is not continuous. For example, the frequency domain units to be reported are sparsely distributed in the reporting bandwidth. In this case, the frequency domain unit to be reported may not have good frequency domain continuity, and if the above-mentioned two-domain compression method is still used to feed back the precoding vector, the precoding vector may not be well adapted to the downlink channel. Moreover, if the number of the frequency domain units to be reported is small, each frequency domain unit is reported separately based on the feedback mode of the type II codebook, which does not bring large feedback overhead. Therefore, the terminal device may further determine whether to feed back the precoding vector in a manner of dual-domain compression before determining the first indication information.

Optionally, step 210 specifically includes: and the terminal equipment determines the first indication information under the condition that the frequency domain units to be reported in the frequency domain unit group meet the preset conditions.

That is to say, the terminal device feeds back the precoding vector in a two-domain compression manner under the condition that it is determined that the frequency domain unit to be reported satisfies the preset condition, and then determines the first indication information.

For example, the preset condition may be: the number of the frequency domain units to be reported in the frequency domain unit group is more than or equal to x multiplied by Q, x is a predefined value, and x is more than 0 and less than or equal to 1. Or, the ratio of the number of frequency domain units to be reported in the frequency domain unit group to Q is greater than or equal to x. Optionally, x is 0.5.

The Q frequency domain units are formed by all frequency domain units from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group, and may occupy part or all of the bandwidth of the frequency domain unit group. When the frequency domain units to be reported occupy a larger proportion of the Q frequency domain units, it may be considered that the distribution of the frequency domain units to be reported is more continuous, and the first indication information may be determined based on the method described above.

Taking fig. 3 as an example, the number of frequency domain units to be reported in the frequency domain unit group shown in fig. 3 is 29, the Q value is 38, and 29 is greater than 0.5 × 38, so that the frequency domain units to be reported satisfy the preset condition, and the terminal device may determine the first indication information based on the method described above.

It should be understood that the above values of x are only examples and should not limit the present application in any way. The value of x is not limited in this application.

For another example, the preset condition may be: the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined first threshold value.

That is, when the number of frequency domain units to be reported in the frequency domain unit group is large, the first indication information may be determined based on the method described above.

For another example, the preset condition may be: the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined second threshold, and the Q value is greater than or equal to a predefined third threshold.

That is, when the number of frequency domain units to be reported in the frequency domain unit group is large and the Q value is large, the first indication information may be determined based on the method described above. The second threshold and the third threshold may be independent of each other, and the magnitude relationship between the second threshold and the third threshold is not limited in the present application.

For another example, the preset condition may be: the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined fourth threshold, the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to yXQ, y is greater than 0 and less than or equal to 1, and y is a predefined value.

That is, when the number of frequency domain units to be reported in the frequency domain unit group is large and the ratio of the frequency domain units to be reported in the Q frequency domain units is large, the first indication information may be determined based on the method described above.

For another example, the preset condition may be: the number of frequency domain units which do not need to be reported in the frequency domain unit group is less than or equal to a predefined fifth threshold, and the Q value is greater than or equal to a predefined sixth threshold.

That is, when the number of frequency domain units that do not need to be reported in the frequency domain unit group is small and the Q value is large, the first indication information may be determined based on the method described above.

For another example, the preset condition may be: the number of frequency domain units which do not need to be reported in the frequency domain unit group is less than or equal to a predefined seventh threshold, the number of frequency domain units which do not need to be reported is less than or equal to zXQ, z is more than 0 and less than or equal to 1, and z and a sixth threshold are predefined values.

That is, when the number of frequency domain units that do not need to be reported in the frequency domain unit group is small and the ratio of the frequency domain units in Q frequency domain units is small, most of the frequency domain units in the Q frequency domain units are considered to be frequency domain units to be reported, and the first indication information may be determined based on the method described above.

For another example, the preset condition may be: the number of frequency domain units which do not need to be reported in the frequency domain unit group is less than or equal to the eighth threshold.

That is, when the number of frequency domain units that do not need to be reported in the frequency domain unit group is small, most of the frequency domain units in the frequency domain unit group can be considered as frequency domain units to be reported, so that the distribution of the frequency domain units to be reported in the frequency domain unit group can be considered to be continuous, and the first indication information can be determined based on the method described above.

It should be understood that the above shows a number of predefined values, such as the first to seventh thresholds, as well as x, y, z, etc., for ease of understanding only. The predefined values may be independent of each other, and the specific values of the predefined values are not limited in the present application.

It should also be understood that the above shows various preset conditions for determining whether to feed back a precoding vector based on a dual-domain compression manner, for the sake of understanding only. This should not be construed as limiting the application in any way. When a protocol defines a certain preset condition as a condition for determining whether to use a dual-domain compression method to feed back a precoding vector, the terminal device may determine the feedback method based on the preset condition, and the network device may also recover the precoding vector according to the received feedback based on the same preset condition.

In step 230, the terminal device transmits the first indication information. Accordingly, the network device receives the first indication information.

Specifically, the first indication information may be a PMI, or may be a partial information element in the PMI, or may be other information. This is not a limitation of the present application. The first indication information may be carried in one or more messages in the prior art and sent to the network device by the terminal device, or may be carried in one or more messages newly designed in the present application and sent to the network device by the terminal device. The terminal device may send the first indication information to the network device through a physical uplink resource, for example, a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH), so that the network device recovers the precoding vector based on the first indication information.

The specific method for the terminal device to send the first indication information to the network device through the physical uplink resource may be the same as that in the prior art, and a detailed description of a specific process of the terminal device is omitted here for brevity.

In step 240, the network device determines one or more frequency domain vectors from the first indication information.

The network device may determine one or more frequency domain vectors fed back by the terminal device according to the first indication information.

The method for the network device to determine one or more frequency domain vectors according to the first indication information corresponds to the method for the terminal device to determine the frequency domain vectors.

If the terminal device reports one or more frequency domain vectors based on each transmission layer, the network device may determine one or more frequency domain vectors corresponding to each transmission layer. If the terminal device reports the common one or more frequency domain vectors based on the R transport layers, the terminal device may determine one or more frequency domain vectors that may be common to the R transport layers. If the terminal device reports one or more frequency domain vectors based on each space domain vector, the network device may determine one or more frequency domain vectors corresponding to each space domain vector.

The method for the terminal equipment to determine one or more frequency domain vectors according to the first indication information corresponds to the method for the terminal equipment to determine the indication information of the frequency domain vectors.

If the terminal device indicates the selected frequency domain vector using an index of the combination of frequency domain vectors, the network device may determine one or more frequency domain vectors indicated by the terminal device from the set of frequency domain vectors according to the index. If the terminal device indicates the selected frequency domain vector using the index of each frequency domain vector, the network device may determine one or more frequency domain vectors indicated by the terminal device from the set of frequency domain vectors according to each index. If the terminal device uses the bitmap to indicate the frequency domain vectors, the network device may determine one or more frequency domain vectors indicated by the terminal device according to the corresponding relationship between the bitmap and each frequency domain vector in the frequency domain vector set.

Further, the first indication information may also be used to indicate one or more spatial vectors and one or more weighting coefficients. The network device may determine one or more spatial vectors and one or more weighting coefficients based on the first indication. Similarly, the method for determining the space vector by the network device according to the first indication information corresponds to the method for generating the indication information of the space vector by the terminal device. The method for determining the weighting coefficient by the network device according to the first indication information corresponds to the method for generating the indication information of the weighting coefficient by the terminal device. Since the specific method for the network device to determine the spatial vector and the weighting coefficient according to the first indication information may refer to the prior art, a detailed description of the specific process is omitted here for brevity.

Optionally, step 240 specifically includes: and the network equipment determines one or more frequency domain vectors according to the first indication information under the condition that the frequency domain units to be reported in the frequency domain unit group meet the preset conditions.

The network device determines whether the frequency domain unit to be reported in the frequency domain unit group satisfies the preset condition, which is similar to the specific process of the terminal device determining whether the frequency domain unit to be reported in the frequency domain unit group satisfies the preset condition in step 210, and for brevity, the description is omitted here.

The preset condition may be predetermined by the terminal device and the network device, or predefined by a protocol. The network device and the terminal device may determine whether the frequency domain unit to be reported satisfies the preset condition based on the same preset condition.

Optionally, the method further includes step 250, the network device determines precoding vectors of one or more frequency domain elements in the group of frequency domain elements.

The network device may determine the precoding vector for one or more of the frequency domain elements in the set of frequency domain elements based on the predetermined frequency domain vectors, spatial domain vectors, and weighting coefficients, e.g., as determined in step 240 above.

And if the terminal equipment respectively feeds back the space domain vector, the frequency domain vector and the weighting coefficient aiming at each transmission layer in the R transmission layers. Then for the r transport layer, the network device may determine L according to the first indication information _rSpace vector, M_rA sum of frequency domain vectors L_r×M_rA weighting factor. The network device may determine a precoding vector on the r-th transmission layer with the j-th frequency domain element in the group of frequency domain elements based on the following formula:

when the number of the polarization directions is 1,

when the number of the polarization directions is 2,

wherein u is_l,rIndicating L based on the r transport layer feedback_rThe l spatial vector, v, of the spatial vectors_m,rM representing feedback based on the r-th transport layer_rM-th one of the frequency domain vectors, v_m,r(j) Denotes v_m,rThe (c) th element of (a),

denotes v_m,r(j) In a common vesselA yoke;

which is indicative of a normalized coefficient of the,

a_l,m,rrepresenting feedback based on the r-th transmission layer with the l-th space vector u_l,rAnd the m-th frequency domain vector v_m,rA corresponding weighting factor; a is_l,m,r,1Representing the first polarization direction and the l space vector u based on the r transport layer feedback_lAnd the m-th frequency domain vector v_mA corresponding weighting factor; a is_l,m,r,2Representing the second polarization direction and the l space vector u based on the r transport layer feedback_l,rAnd the m-th frequency domain vector v_m,rThe corresponding weighting coefficients.

Wherein each weighting coefficient may comprise an amplitude coefficient and a phase coefficient. For example,

p_l,m,rwhich is indicative of the amplitude coefficient of the signal,

representing the phase coefficient. a is_l,m,r,1And a_l,m,r,2The relationship with the amplitude coefficient and the phase coefficient, respectively, is similar and, for the sake of brevity, is not further illustrated.

Furthermore, as mentioned above, the number of weighting coefficients fed back by the terminal device based on the r-th transmission layer may not necessarily be equal to L_r×M_rThat is, not necessarily with L described above_rA space vector sum M_rL constructed from frequency domain vectors_r×M_rThe space-frequency component matrices correspond. And may only interact with the L_r×M_rSome of the space-frequency component matrices correspond. In this case, the above formula can be further simplified, or some of the unreported weighting coefficients in the above formula can be treated as the weighting coefficients with zero amplitude. The method for recovering the pre-coding vector by the network equipment is the interior of the equipmentThe implementation behavior is that the specific method for recovering the precoding vector by the network device is not limited in the present application.

If R transmission layers share one or more spatial vectors and one or more frequency domain vectors, such as L spatial vectors and M frequency domain vectors, the above formula for determining the precoding vector for the jth frequency domain unit in the jth transmission layer and the jth frequency domain unit in the set of frequency domain units can be simplified as follows:

when the number of the polarization directions is 1,

when the number of the polarization directions is 2,

wherein u is_lRepresents the L-th space vector, v, of the L space vectors_mRepresenting the mth of the M frequency domain vectors. v. of _m(j) Denotes v_mThe (c) th element of (a),

denotes v_m(j) Conjugation of (1).

If the terminal device feeds back one or more frequency domain vectors based on each space domain vector, the above formula for determining the precoding vector of the jth frequency domain unit in the jth transmission layer and the jth frequency domain unit group may be transformed into:

when the number of the polarization directions is 1,

when the number of the polarization directions is 2,

wherein u is_l,rIndicating L based on the r transport layer feedback_rThe l-th one of the spatial vectors,

representing M corresponding to the l space vector based on the r transport layer feedback_l，r(M_l，rNot less than 1 and integer) m-th frequency domain vector_lA number of frequency-domain vectors of a frequency domain,

to represent

The conjugate of the jth element;

representing feedback based on the r-th transmission layer with the l-th space vector and the m-th space vector_lWeighting coefficients corresponding to the frequency domain vectors;

representing the sum of the first space vector and the mth space vector in the first polarization direction based on the feedback of the r transmission layer_lWeighting coefficients corresponding to the frequency domain vectors;

representing the sum of the ith space vector and the ith space vector in the second polarization direction based on the feedback of the r-th transmission layer_lThe weighting coefficients corresponding to the frequency domain vectors.

If the terminal device separately reports the wideband amplitude coefficient of the space-frequency vector and the weighting coefficient of the space-frequency component matrix, the above formula for determining the precoding vector of the jth frequency-domain unit in the frequency-domain unit group on the r-th transmission layer may be further modified as follows:

When the number of the polarization directions is 1,

when the number of the polarization directions is 2,

wherein the content of the first and second substances,

representing wideband amplitude coefficients corresponding to the l space vector based on the r transport layer feedback; p is a radical of_l,m,rRepresenting a signal corresponding to an i spatial vector and an m frequency domain vector based on an r transport layer feedback;

representing phase coefficients corresponding to the l spatial vector and the m frequency domain vector based on the r transport layer feedback;

representing a wideband amplitude coefficient corresponding to the l spatial vector in the first polarization direction based on the feedback of the r transport layer; p is a radical of_l,m,r,1Representing amplitude coefficients corresponding to the ith spatial vector and the mth frequency domain vector in the first polarization direction based on the feedback of the ith transmission layer;

representing phase coefficients corresponding to the l space domain vector and the m frequency domain vector in the first polarization direction based on the r transmission layer feedback;

representing a wideband amplitude coefficient in a second polarization direction based on the feedback of the r-th transport layer; p is a radical of_l,m,r,2Representing amplitude coefficients corresponding to the l-th space domain vector and the m-th frequency domain vector in the second polarization direction based on the r-th transmission layer feedback;

indicating phase coefficients corresponding to the l-th spatial vector and the m-th frequency domain vector in the second polarization direction based on the r-th transmission layer feedback.

It should be understood that the above listed formulas for recovering the precoding vectors of the frequency domain units are only examples, and should not constitute any limitation to the present application. Those skilled in the art can perform equivalent transformation or substitution on the above formula based on the same concept to recover the precoding vectors of the frequency domain units.

It should also be understood that the above-listed method for calculating the precoding vector of each frequency domain unit based on the formula is only an example, and should not limit the present application in any way. The network device may also construct a space-frequency matrix based on the space-domain vector, the frequency-domain vector, and the weighting coefficients, e.g.

And then determining the precoding vector of each frequency domain unit. In addition, the calculation formula of the space-frequency matrix illustrated here only shows the case where L space-domain vectors and M frequency-domain vectors are shared by R transmission layers, and the above possible cases can be modified. For brevity, a description thereof will not be given here.

In the embodiment of the application, the terminal device determines the length of the frequency domain vector based on the number of the frequency domain units contained in the bandwidth occupied by the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group, so that the selected frequency domain vector can keep the continuity of the frequency domain, and the change rule of the channel in the frequency domain can be more accurately reflected. Therefore, higher feedback precision can be ensured, so that the precoding vector recovered by the network equipment based on the feedback of the terminal equipment can be better adapted to the channel, and the subsequent data transmission performance can be improved. On the contrary, if the length of the frequency domain vector is determined only according to the number of the frequency domain units to be reported, the selected frequency domain vector does not truly simulate the change rule of the channel on a plurality of continuous frequency domain units, so the change rule of the channel in the frequency domain cannot be accurately reflected, and the feedback precision is affected.

And one or more frequency domain vectors are used for describing different change rules of the channel on the frequency domain, the change of the channel on the frequency domain is simulated by linear superposition of the one or more frequency domain vectors, the relation among frequency domain units is fully mined, the continuity of the frequency domain is utilized, and less frequency domain vectors are used for describing the change rules of the channel on a plurality of frequency domain units. Compared with the existing type II codebook feedback mode, the method has the advantages that the subband superposition coefficient does not need to be independently reported based on each subband, and the feedback overhead is not multiplied under the condition that the number of the subbands is increased. Feedback overhead can be greatly reduced.

It should be understood that, in the above-provided vector indication manner for constructing the precoding vector, the determination method for the length of the frequency domain vector is not limited to one transmission layer or one polarization direction. The length of the frequency domain vector determined by the terminal device for a group of frequency domain units may be adapted to one or more transmission layers and to one or more polarization directions. In other words, for a frequency domain unit group, the terminal device may determine the length of the frequency domain vector only once, and then perform the two-domain compression to determine the frequency domain vector to be reported. The number of transmission layers and the number of polarization directions are not limited.

As described above, in a case that the continuity of the frequency domain units to be reported is not good, or in a case that the frequency domain units to be reported are few, feeding back the precoding vector in a dual-domain compression manner does not necessarily reduce the feedback overhead, and may affect the feedback accuracy. Therefore, the feedback mode of the dual-domain compression provided above may coexist with other feedback modes, and the terminal device may determine which mode to use to feed back the precoding vector to the network device based on the number and the position of the frequency domain units to be reported.

Fig. 6 is a schematic flow chart of a method 600 for reporting a PMI according to another embodiment of the present application, which is shown from the perspective of device interaction. As shown, the method 600 may include steps 610 through 630. The steps of method 600 are described in detail below.

In step 610, the terminal apparatus generates a PMI.

The frequency domain unit group has already been described in detail in the method 200, and is not described herein again for brevity.

In this embodiment of the present application, when a frequency domain unit to be reported in a frequency domain unit group satisfies a preset condition, the PMI includes an indication of one or more frequency domain vectors. The one or more frequency domain vectors are partial frequency domain vectors of a set of frequency domain vectors. As mentioned above, the frequency domain vectors in each frequency domain vector set are orthogonal to each other two by two. That is, the one or more frequency domain vectors may be one or more frequency domain vectors selected from a set of frequency domain vectors by way of frequency domain compression.

Under the condition that the frequency domain units to be reported in the frequency domain unit group do not meet the preset condition, the PMI does not comprise the indication of the frequency domain vector, or only comprises the indication of the frequency domain vector group.

Specifically, when the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, the terminal device may still report the space domain vector, the wideband amplitude coefficient, and the subband superposition coefficient in the PMI feedback manner of the type II codebook, under which case the PMI does not include the indication of the frequency domain vector.

When the frequency domain units to be reported in the frequency domain unit group do not meet the preset conditions, the terminal equipment can directly feed back one frequency domain vector group to the network equipment without adopting a feedback mode of a type II codebook, so that the network equipment can restore the precoding vector according to each frequency domain vector, the space vector and the weighting coefficient in the frequency domain vector group. In this case, only an indication of the set of frequency domain vectors may be included in the PMI. Or, the terminal device may not feed back the indication of the frequency domain vector group, and the terminal device and the network device may agree in advance that the frequency domain vector of the first frequency domain vector group in the frequency domain vector set is used to recover the precoding vector. In this case, no indication of a frequency domain vector or set of frequency domain vectors is included in the PMI. At this time, although the dual-domain compression is performed, a part of the frequency domain vectors are not selected from the frequency domain vector set, but all the frequency domain vectors in the frequency domain vector set are used to construct the precoding vector. The terminal equipment can directly determine the space domain vector and the weighting coefficient based on all the frequency domain vectors in the frequency domain vector group and further based on a double-domain compression mode. For example, a space-domain vector, a weighting coefficient, and the like are determined by performing spatial and frequency-domain DFT on a space-frequency matrix.

For the convenience of distinction and explanation, the dual-domain compression method in which a precoding vector is constructed by using a part of frequency domain vectors in a frequency domain vector group is referred to as a first compression method in this embodiment; the two-domain compression scheme that constructs the precoding vector using the entire set of frequency domain vectors is referred to as the second compression scheme. The PMI feedback method based on the first compression method is referred to as a PMI feedback method based on the first compression method, and the PMI feedback method based on the second compression method is referred to as a PMI feedback method based on the second compression method. It is understood that the first compression mode and the second compression mode belong to a dual-domain compression mode.

Note that the PMI described above includes an indication of a frequency domain vector, and does not mean that the PMI includes an indication of only a frequency domain vector, and for example, the PMI may further include an indication of a spatial domain vector and an indication of a weighting coefficient. The PMI described herein includes an indication of whether a frequency domain vector is included, only to distinguish between the first compression scheme and the second compression scheme.

In this embodiment, the terminal device and the network device may agree in advance on preset conditions. Under the condition that frequency domain units to be reported in a frequency domain unit group meet preset conditions, PMI feedback based on a first compression mode is adopted; and when the frequency domain units in the frequency domain unit group do not meet the preset condition, adopting a PMI feedback mode based on the second compression mode or adopting a PMI feedback mode of a type II codebook.

When the frequency domain units to be reported in the frequency domain unit group do not meet the preset condition, the network device and the terminal device may agree in advance or the protocol predefines by using the PMI feedback mode based on the second compression mode or the PMI feedback mode of the type II codebook. The network device and the terminal device may execute corresponding steps based on the same feedback manner when it is determined that the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition.

In the following, several possible preset conditions are exemplarily listed. It should be understood that, when a protocol defines, or a network device and a terminal device agree in advance to use a certain preset condition as a basis for determining the PMI feedback manner, the network device and the terminal device determine the PMI feedback manner based on the same preset condition. It should also be understood that the preset conditions listed below are only examples and should not constitute any limitation to the present application.

Optionally, the preset condition is: the number of the frequency domain units to be reported in the frequency domain unit group is more than or equal to x multiplied by Q, x is a predefined value, and x is more than 0 and less than or equal to 1. Or, the ratio of the number of frequency domain units to be reported in the frequency domain unit group to Q is greater than or equal to x. Optionally, x is 0.5.

Optionally, the preset condition is: the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined first threshold value.

Optionally, the preset condition is: the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined second threshold, and the Q value is greater than or equal to a predefined third threshold.

Optionally, the preset condition is: the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined fourth threshold, the number of the frequency domain units to be reported in the frequency domain unit group is greater than or equal to yxq, y is greater than 0 and less than or equal to 1, and y is a predefined value.

Optionally, the preset condition is: the number of frequency domain units which do not need to be reported in the frequency domain unit group is less than or equal to a predefined fifth threshold, and the Q value is greater than or equal to a predefined sixth threshold.

Optionally, the preset condition is: the number of frequency domain units which do not need to be reported in the frequency domain unit group is less than or equal to a predefined seventh threshold, the number of frequency domain units which do not need to be reported is less than or equal to zXQ, z is more than 0 and less than or equal to 1, and z is a predefined value.

Optionally, the preset condition is: and the number of the frequency domain units which do not need to be reported in the frequency domain unit group is less than or equal to a predefined eighth threshold value.

Since the above preset conditions have been described in detail in the method 200, they are not described herein again for brevity.

When the terminal equipment determines a frequency domain vector based on the first compression mode, the length N of the frequency domain vector_fFor example, the number Q of frequency domain units included in the bandwidth from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the above-listed frequency domain unit groups may be determined. Since N has already been aligned in method 200 above_fThe relationship with Q has been described in detail, and for brevity, it is not repeated herein。

It should be understood, however, that the length of the frequency domain vector, N_fThe length of the frequency domain vector may also be determined by the number of frequency domain units included in the reporting bandwidth, or by the number of frequency domain units to be reported in a group of frequency domain units, for example. This is not a limitation of the present application.

When the terminal equipment determines the frequency domain vector group based on the second compression mode, the length N of the frequency domain vector_fOr may be the same as the length of the frequency domain vector determined in the first compression mode. For example, the length of the frequency domain vector may be determined by the number Q of frequency domain units included in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported. Or, the length of the frequency domain vector may also be determined by the number of frequency domain units to be reported in the frequency domain unit group, or the length of the frequency domain vector may also be determined by the number of frequency domain units included in the reporting bandwidth. This is not limited in this application.

After negotiating the way of determining the length of the frequency domain vector, the terminal device may determine the length of the frequency domain vector based on a predefined method. The network device may also determine a frequency domain vector for recovering the precoding vector based on the same method and the feedback of the terminal device.

In step 620, the terminal device transmits a PMI. Accordingly, the network device receives the PMI.

Specifically, the terminal device may send the PMI to the network device through a physical uplink resource, such as a PUSCH or a PUCCH, so that the terminal device determines the precoding matrix according to the PMI.

The specific method for the terminal device to send the PMI to the network device through the physical uplink resource may be the same as that in the prior art, and for brevity, a detailed description of a specific process thereof is omitted here.

In step 630, the network device determines a precoding matrix corresponding to each frequency domain unit according to whether the PMI and the frequency domain unit to be reported in the frequency domain unit group satisfy the preset condition.

The network device may determine, based on the preset condition, which feedback manner the terminal device feeds back the PMI based on, and further analyze information in the PMI according to the feedback manner.

If the network device determines that the frequency domain unit to be reported in the frequency domain unit group meets the preset condition, it may be determined that the terminal device determines the frequency domain vector based on the first compression mode, that is, the PMI feedback mode based on the frequency domain compression is adopted. The network device may recover the precoding vectors of one or more frequency domain elements on each transmission layer based on the method listed in step 250 of the method 200 above, and further determine the precoding matrix of each frequency domain element.

If the network device determines that the frequency domain unit to be reported in the frequency domain unit group does not meet the preset condition, it may be determined that the terminal device adopts a PMI feedback mode of a type II codebook, or a PMI feedback mode based on frequency domain transformation.

If the PMI feedback mode of the type II codebook is adopted, the network device may determine the precoding matrix of each frequency domain unit based on the prior art. A specific implementation may refer to the type II port defined in NR protocol TS38.214 version 15(release 15, R15) to select the feedback mode defined in the codebook. For brevity, no further description is provided herein.

If the PMI feedback mode based on the second compression mode is adopted, the network device may determine the precoding matrix of each frequency domain unit based on the dual-domain compression mode according to a predefined frequency domain vector group or a frequency domain vector group fed back by the terminal device. The detailed implementation of the method is described in detail in step 250 of the method 200 above, and is not described here for brevity.

Therefore, in the embodiments of the present application, multiple feedback modes are introduced, and a suitable feedback mode is selected according to the number and position of the frequency domain units to be reported to report the PMI. The number of frequency domain units to be reported and the distribution continuity are fully considered. By introducing various feedback modes to adapt to different conditions, both the feedback precision and the feedback overhead can be considered, so that balance is obtained between the feedback precision and the feedback overhead.

It should be understood that, in the foregoing embodiment, the sequence numbers of the processes do not imply an order of execution, and the order of execution of the processes should be determined by functions and internal logic of the processes, and should not limit the implementation process of the embodiment of the present application in any way.

The method for indicating and determining a precoding vector provided in the embodiment of the present application is described in detail above with reference to fig. 2 to 6. Hereinafter, a communication device according to an embodiment of the present application will be described in detail with reference to fig. 7 to 9.

Fig. 7 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown, the communication device 1000 may include a communication unit 1100 and a processing unit 1200.

In a possible design, the communication apparatus 1000 may correspond to the terminal device in the foregoing method embodiment, and may be the terminal device or a chip configured in the terminal device, for example.

Specifically, the communication apparatus 1000 may correspond to the terminal device in the method 200 or the method 600 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for performing the method performed by the terminal device in the method 200 or the method 600 in fig. 2 or fig. 6. Also, the units and other operations and/or functions described above in the communication device 1000 are respectively for implementing the corresponding flows of the method 200 in fig. 2 or the method 600 in fig. 6.

Wherein, when the communication device 1000 is used to execute the method 200 in fig. 2, the communication unit 1100 may be used to execute the steps 220 and 230 in the method 200, and the processing unit 1200 may be used to execute the step 210 in the method 200. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

When the communication device 1000 is configured to perform the method 600 in fig. 6, the communication unit 1100 may be configured to perform the step 620 in the method 600, and the processing unit 1200 may be configured to perform the step 610 in the method 600. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

It is further understood that when the communication apparatus 1000 is a terminal device, the communication unit 1100 in the communication apparatus 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in fig. 8, and the processing unit 1200 in the communication apparatus 1000 may correspond to the processor 2010 in the terminal device 2000 shown in fig. 8.

It should also be understood that when the communication apparatus 1000 is a chip configured in a terminal device, the communication unit 1100 in the communication apparatus 1000 may be an input/output interface.

In another possible design, the communication apparatus 1000 may correspond to the network device in the above method embodiment, and may be, for example, a network device or a chip configured in a network device.

Specifically, the communication apparatus 1000 may correspond to the network device in the method 200 or the method 600 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for performing the method performed by the network device in the method 200 or the method 600 in fig. 2 or fig. 6. Also, the units and other operations and/or functions described above in the communication device 1000 are respectively for implementing the corresponding flows of the method 200 in fig. 2 or the method 600 in fig. 6.

Wherein, when the communication device 1000 is used to execute the method 300 in fig. 7, the communication unit 1100 may be used to execute the steps 220 and 230 in the method 200, and the processing unit 1200 may be used to execute the steps 240 and 250 in the method 200. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

When the communication device 1000 is configured to perform the method 600 in fig. 6, the communication unit 1100 may be configured to perform the step 620 in the method 600, and the processing unit 1200 may be configured to perform the step 630 in the method 600. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

It should also be understood that when the communication apparatus 1000 is a network device, the communication unit in the communication apparatus 1000 may correspond to the transceiver 3200 in the network device 3000 shown in fig. 9, and the processing unit 1200 in the communication apparatus 1000 may correspond to the processor 3100 in the network device 3000 shown in fig. 9.

It should also be understood that when the communication device 1000 is a chip configured in a network device, the communication unit 1100 in the communication device 1000 may be an input/output interface.

Fig. 8 is a schematic structural diagram of a terminal device 2000 according to an embodiment of the present application. The terminal device 2000 can be applied to the system shown in fig. 1, and performs the functions of the terminal device in the above method embodiment. As shown, the terminal device 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further comprises a memory 2030. The processor 2010, the transceiver 2002 and the memory 2030 may be in communication with each other via the interconnection path to transfer control and/or data signals, the memory 2030 may be used for storing a computer program, and the processor 2010 may be used for retrieving and executing the computer program from the memory 2030 to control the transceiver 2020 to transmit and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040, configured to transmit uplink data or uplink control signaling output by the transceiver 2020 by using a wireless signal.

The processor 2010 and the memory 2030 may be combined into a processing device, and the processor 2010 is configured to execute the program codes stored in the memory 2030 to achieve the above functions. In particular implementations, the memory 2030 may also be integrated into the processor 2010 or separate from the processor 2010. The processor 2010 may correspond to the processing unit in fig. 7.

The transceiver 2020 may correspond to the communication unit in fig. 7, and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Wherein the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that terminal device 2000 shown in fig. 8 is capable of implementing various processes involving the terminal device in the method embodiments shown in fig. 2 or fig. 6. The operations and/or functions of the modules in the terminal device 2000 are respectively to implement the corresponding flows in the above method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

The processor 2010 may be configured to perform the actions described in the foregoing method embodiments as being implemented internally by the terminal device, and the transceiver 2020 may be configured to perform the actions described in the foregoing method embodiments as being transmitted by the terminal device to the network device or received by the terminal device from the network device. Please refer to the description in the previous embodiment of the method, which is not repeated herein.

Optionally, the terminal device 2000 may further include a power supply 2050 for supplying power to various devices or circuits in the terminal device.

In addition, in order to further improve the functions of the terminal device, the terminal device 2000 may further include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, a sensor 2100, and the like, and the audio circuit may further include a speaker 2082, a microphone 2084, and the like.

Fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application, for example, a schematic structural diagram of a base station. The base station 3000 can be applied to the system shown in fig. 1, and performs the functions of the network device in the above method embodiment. As shown, the base station 3000 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 3100 and one or more baseband units (BBUs) (which may also be referred to as Distributed Units (DUs)) 3200. The RRU 3100 may be referred to as a transceiver unit and corresponds to the communication unit 1200 in fig. 7. Alternatively, the transceiving unit 3100 may also be referred to as a transceiver, transceiving circuit, or transceiver, etc., which may comprise at least one antenna 3101 and a radio frequency unit 3102. Alternatively, the transceiving unit 3100 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter, transmitting circuit). The RRU 3100 part is mainly used for transceiving and converting radio frequency signals to baseband signals, for example, for sending indication information to a terminal device. The BBU 3200 section is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 3100 and the BBU 3200 may be physically disposed together or may be physically disposed separately, i.e. distributed base stations.

The BBU 3200, which is a control center of the base station and may also be referred to as a processing unit, may correspond to the processing unit 1100 in fig. 7, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) may be configured to control the base station to perform an operation procedure related to the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU 3200 may be formed by one or more boards, and the boards may collectively support a radio access network of a single access system (e.g., an LTE network), or may respectively support radio access networks of different access systems (e.g., an LTE network, a 5G network, or other networks). The BBU 3200 also includes a memory 3201 and a processor 3202. The memory 3201 is used to store necessary instructions and data. The processor 3202 is used for controlling the base station to perform necessary actions, for example, for controlling the base station to execute the operation flow related to the network device in the above method embodiment. The memory 3201 and processor 3202 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be understood that the base station 3000 shown in fig. 9 can implement various processes involving network devices in the method embodiments of fig. 2 or 6. The operations and/or functions of the modules in the base station 3000 are respectively for implementing the corresponding flows in the above method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is omitted here where appropriate to avoid repetition.

BBU 3200 as described above can be used to perform actions described in previous method embodiments as being implemented internally by a network device, while RRU 3100 can be used to perform actions described in previous method embodiments as being sent by or received from a terminal device by a network device. Please refer to the description in the previous embodiment of the method, which is not repeated herein.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform a vector indication method for constructing a precoding vector in any of the above method embodiments.

It should be understood that the processing means may be a chip. For example, the processing device may be a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Microcontroller (MCU), a Programmable Logic Device (PLD), or other integrated chips.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor described above may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the present application, the present application further provides a computer program product, which includes: computer program code which, when run on a computer, causes the computer to perform the method of any of the embodiments shown in figures 2 and 6.

According to the method provided by the embodiment of the present application, the present application also provides a computer readable medium storing program code, which when run on a computer causes the computer to execute the method of any one of the embodiments shown in fig. 2 and 6.

According to the method provided by the embodiment of the present application, the present application further provides a system, which includes the foregoing one or more terminal devices and one or more network devices.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The network device in the foregoing device embodiments completely corresponds to the terminal device and the network device or the terminal device in the method embodiments, and the corresponding module or unit executes the corresponding steps, for example, the communication unit (transceiver) executes the steps of receiving or transmitting in the method embodiments, and other steps besides transmitting and receiving may be executed by the processing unit (processor). The functions of the specific elements may be referred to in the respective method embodiments. The number of the processors may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with one another over a local system, distributed system, and/or network, such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps (step) described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the above embodiments, the functions of the functional units may be wholly or partially implemented by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). The procedures or functions described in accordance with the embodiments of the present application are generated in whole or in part when the computer program instructions (programs) are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a portable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A vector indication method for constructing a precoding vector, comprising:

generating first indication information, wherein the first indication information is used for indicating one or more frequency domain vectors, the one or more frequency domain vectors are used for constructing precoding vectors corresponding to one or more frequency domain units in a frequency domain unit group, and the length N of the frequency domain vector is_fDetermining the number Q of frequency domain units contained in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, wherein the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reporting bandwidth; n is a radical of_fAnd Q are positive integers;

and sending the first indication information.

2. The method of claim 1, wherein the generating the first indication information comprises:

and generating the first indication information under the condition that the frequency domain units to be reported in the frequency domain unit group meet a preset condition.

3. A vector indication method for constructing a precoding vector, comprising:

receiving first indication information, wherein the first indication information is used for indicating one or more frequency domain vectors, the one or more frequency domain vectors are used for constructing precoding vectors corresponding to one or more frequency domain units in a frequency domain unit group, and the length of the frequency domain vector is N _fDetermining the number Q of the frequency domain units contained in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, wherein the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reporting bandwidth; n is a radical of_fAnd Q are both positive integers;

determining the one or more frequency domain vectors from the first indication information.

4. The method of claim 3, wherein the determining the one or more frequency domain vectors from the first indication information comprises:

and determining the one or more frequency domain vectors according to the first indication information under the condition that the frequency domain units to be reported in the frequency domain unit group meet a preset condition.

5. The method of claim 2 or 4, wherein the preset conditions include: the number of the frequency domain units to be reported in the frequency domain unit group is more than or equal to x multiplied by Q, x is a predefined value, and x is more than 0 and less than or equal to 1.

6. The method of claim 5, wherein x is 0.5.

7. The method of any one of claims 1 to 4, wherein N is _f＝Q。

8. A communications apparatus, comprising:

a processing unit, configured to generate first indication information, where the first indication information is used to indicate one or more frequency domain vectors, where the one or more frequency domain vectors are used to construct precoding vectors corresponding to one or more frequency domain units in a frequency domain unit group, and a length N of the frequency domain vector is N_fDetermining the number Q of frequency domain units contained in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, wherein the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reporting bandwidth; n is a radical of_fAnd Q are positive integers;

a communication unit, configured to send the first indication information.

9. The apparatus of claim 8, wherein the processing unit is specifically configured to generate the first indication information when a frequency domain unit to be reported in the frequency domain unit group satisfies a preset condition.

10. A communications apparatus, comprising:

a communication unit, configured to receive first indication information, where the first indication information is used to indicate one or more frequency domain vectors, where the one or more frequency domain vectors are used to construct precoding vectors corresponding to one or more frequency domain units in a group of frequency domain units, and a length of the frequency domain vector is N _fDetermining the number Q of frequency domain units contained in the bandwidth occupied by the frequency domain unit group from the first frequency domain unit to be reported to the last frequency domain unit to be reported, wherein the frequency domain unit group comprises one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the reporting bandwidth; n is a radical of_fAnd Q are both positive integers;

a processing unit, configured to determine the one or more frequency domain vectors according to the first indication information.

11. The apparatus of claim 10, wherein the processing unit is specifically configured to determine the one or more frequency domain vectors according to the first indication information when a frequency domain unit to be reported in the frequency domain unit group satisfies a preset condition.

12. The apparatus of claim 9 or 11, wherein the preset condition comprises: the number of the frequency domain units to be reported in the frequency domain unit group is more than or equal to x multiplied by Q, x is a predefined value, and x is more than 0 and less than or equal to 1.

13. The apparatus of claim 12, wherein x is 0.5.

14. The apparatus of any one of claims 8 to 11, wherein N is_f＝Q。

15. A communications apparatus comprising at least one processor configured to perform the method of any of claims 1-7.

16. A computer-readable medium, comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 7.