CN117811623A - Communication method and communication device - Google Patents

Communication method and communication device Download PDF

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Publication number
CN117811623A
CN117811623A CN202211215651.3A CN202211215651A CN117811623A CN 117811623 A CN117811623 A CN 117811623A CN 202211215651 A CN202211215651 A CN 202211215651A CN 117811623 A CN117811623 A CN 117811623A
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China
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matrix
vector
target
basis
time
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马思奇
杨培
余政
刘江华
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202211215651.3A priority Critical patent/CN117811623A/en
Publication of CN117811623A publication Critical patent/CN117811623A/en
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Abstract

The embodiment of the application provides a communication method and a communication device, which can indicate delay information and time-varying information of a channel through smaller indication overhead. The method comprises the following steps: the terminal equipment generates first indication information and sends the first indication information to the network equipment. The first indication information is used for indicating a joint matrix selected by the terminal equipment, the joint matrix comprises a frequency domain matrix and a time-varying domain matrix, and the first indication information comprises indication information of base vectors except for a first frequency domain base vector in the frequency domain matrix and indication information of base vectors except for the first time-varying domain base vector in the time-varying domain matrix.

Description

Communication method and communication device
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a communication method and a communication device.
Background
In Massive multiple-input multiple-output (Massive multiple input multiple output, massive-MIMO) technology, a terminal device may receive a reference signal and perform channel state information (channel state information, CSI) measurement on the reference signal, thereby determining a precoding matrix indicator (precoding matrix indicator, PMI) to be transmitted to a network device based on a codebook (codebook). The network device may determine a precoding matrix according to the PMI sent by the terminal device, and perform precoding using the precoding matrix, so as to reduce interference between users and interference between multiple signal streams of the same user.
Currently, in the codebook structure proposed by the third generation partnership project (3rd generation partnership project,3GPP) in release 16, rel-16, the precoding matrix includes a spatial matrix, a frequency domain matrix, and a weighting coefficient matrix. The frequency domain matrix is used for representing delay information of the channel.
However, in a medium-high speed mobile scenario, the frequency domain matrix in the Rel-16 codebook cannot characterize the time-varying information of the channel, and the terminal device indicates the time-varying information of the channel has a need to reduce the indication overhead. Therefore, how to indicate the delay information and time-varying information of the channel with a small indication overhead is a current urgent problem to be solved.
Disclosure of Invention
According to the communication method and the communication device, the delay information and the time-varying information of the channel can be indicated through the small indication overhead.
In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:
in a first aspect, a communication method is provided, which may be performed by a terminal device, or a component of the terminal device, such as a processor, a chip, or a system-on-chip of the terminal device, or a logic module or software capable of implementing all or part of the functions of the terminal device. The following description will be made with an example in which the method is executed by the terminal device. The method comprises the following steps: the terminal equipment generates first indication information and sends the first indication information to the network equipment. The first indication information is used for indicating the joint matrix selected by the terminal equipment. The joint matrix includes a frequency domain matrix and a time-varying domain matrix. The first indication information includes indication information of basis vectors other than the first frequency domain basis vector in the frequency domain matrix, and indication information of basis vectors other than the first time-varying domain basis vector in the time-varying domain matrix. In this embodiment of the present application, the joint matrix including the frequency domain matrix and the time-varying domain matrix may be indicated by the indication information of the basis vectors other than the first frequency domain basis vector in the frequency domain matrix and the indication information of the basis vectors other than the first frequency domain basis vector in the time-varying domain matrix, that is, all the frequency domain basis vectors in the frequency domain matrix and all the time-varying domain basis vectors in the time-varying domain matrix may not be indicated, so the indication overhead may be reduced, and the delay information of the channel may be indicated by the frequency domain matrix in the joint matrix, and the time-varying information of the channel may be indicated by the time-varying domain matrix in the joint matrix. In summary, according to the communication method provided by the embodiment of the application, the delay information and the time-varying information of the channel can be indicated through smaller indication overhead.
In a second aspect, a communication method is provided, where the method may be performed by a network device, or a component of the network device, for example, a processor, a chip, or a system-on-chip of the network device, or implemented by a logic module or software that can implement all or part of the functions of the network device. The following description is made by taking this method as an example by the network device. The method comprises the following steps: the network device receives first indication information from the terminal device. The first indication information is used for indicating the joint matrix selected by the terminal equipment. The joint matrix includes a frequency domain matrix and a time-varying domain matrix. The first indication information includes indication information of basis vectors other than the first frequency domain basis vector in the frequency domain matrix, and indication information of basis vectors other than the first time-varying domain basis vector in the time-varying domain matrix. In this embodiment of the present application, the joint matrix including the frequency domain matrix and the time-varying domain matrix may be indicated by the indication information of the basis vectors other than the first frequency domain basis vector in the frequency domain matrix and the indication information of the basis vectors other than the first frequency domain basis vector in the time-varying domain matrix, that is, all the frequency domain basis vectors in the frequency domain matrix and all the time-varying domain basis vectors in the time-varying domain matrix may not be indicated, so the indication overhead may be reduced, and the delay information of the channel may be indicated by the frequency domain matrix in the joint matrix, and the time-varying information of the channel may be indicated by the time-varying domain matrix in the joint matrix. In summary, according to the communication method provided by the embodiment of the application, the delay information and the time-varying information of the channel can be indicated through smaller indication overhead.
With reference to the first aspect or the second aspect, in one possible implementation manner, the first frequency domain base vector is a frequency domain base vector corresponding to an element with a largest amplitude in a weighting coefficient matrix associated with the joint matrix, and the first time-varying domain base vector is a time-varying domain base vector corresponding to an element with a largest amplitude in the weighting coefficient matrix. That is, the first time-varying domain basis vector and the first frequency-domain basis variable may simultaneously correspond to the weighting coefficient matrix W associated with the joint matrix 2 The element with the largest amplitude value is further in one or more time-varying domain base vectors corresponding to the first frequency domain base vector, so that the first time-varying domain base vector is an essential time-varying domain base vector. Of course, in the one or more frequency domain base vectors corresponding to the first time-varying frequency domain base vector, the first frequency domain base vector may also be made to be an optional frequency domain base vector.
With reference to the first aspect or the second aspect, in one possible implementation manner, the time-varying domain matrix is that the terminal device is in N 4 Selecting M from among the individual time-varying domain basis vectors p A matrix obtained by the base vectors of the time-varying domains, wherein the base vectors except the first time-varying domain base vector in the time-varying domain matrix are M p M in individual time-varying domain basis vectors p -1 time-variant domain basis vectors, M p -1 time-varying domain basis vector is a candidate time-varying domain basis vector combination in a first candidate set comprisingCandidate time-varying domain basis vector combinations, M p And N 4 Are all positive integers, M p Less than N 4 The method comprises the steps of carrying out a first treatment on the surface of the The frequency domain matrix is the N of the terminal equipment 3 Selecting M from the frequency domain basis vectors v Matrix obtained by frequency domain base vectors, wherein base vectors except the first frequency domain base vector in the frequency domain matrix are M v M in the frequency domain basis vectors v -1 frequency domain basis vector, M v -1 frequency domain basis vector is a combination of candidate frequency domain basis vectors in a second candidate set comprising +.>Candidate frequency domain basis vector combinations, M v And N 3 Are all positive integers, M v Less than N 3 。
With reference to the first aspect or the second aspect, in one possible implementation manner, the first indication information is further used to indicate a target base vector combination corresponding to each base vector in the first matrix. Wherein the target basis vector combination comprises one or more basis vectors selected by the terminal device in the target matrix. The first matrix is a matrix within the set of candidate matrices. The target matrix includes one or more matrices of the candidate matrix set other than the first matrix. The candidate matrix set includes a frequency domain matrix, a time-varying domain matrix, and a spatial domain matrix selected by the terminal device. That is, the terminal device may select different time-varying domain base vectors in the time-varying domain matrix according to different frequency-domain base vectors, and indicate the selected time-varying domain base vectors to the network device, so as to reduce the dimension of the weighting coefficient matrix associated with the target matrix, thereby reducing the indication overhead of non-zero elements in the weighting coefficient matrix.
With reference to the first aspect or the second aspect, in one possible implementation manner, the first indication information includes indication information of a target base vector combination corresponding to the first base vector. The indication information of the target base vector combination corresponding to the first base vector comprises indication information of base vectors except the reference base vector in the target base vector combination corresponding to the first base vector. The first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix. The reference base vector is one or more base vectors in the target matrix corresponding to the element with the largest amplitude in the weighting coefficient matrix. That is, since the basis vector corresponding to the element with the largest amplitude is the necessary basis vector, when the basis vector is selected in the target matrix, the number of candidate target basis vector combinations corresponding to the first basis vector can be reduced, thereby reducing the indication overhead of the target basis vector combination corresponding to the first basis vector.
With reference to the first aspect or the second aspect, in a possible implementation manner, the target matrix includes a first target matrix and/or a second target matrix. Wherein the first target matrix is different from the second target matrix.
With reference to the first aspect or the second aspect, in one possible implementation manner, the target base vector combination includes a first target base vector combination and/or a second target base vector combination. Wherein the first target base vector combination comprises one or more base vectors selected by the terminal device in the first target matrix. The second target base vector combination includes one or more base vectors selected by the terminal device in the second target matrix. That is, in the embodiment of the present application, the terminal device may select a time-varying domain base vector and/or a spatial base vector according to the frequency domain base vector; or, the terminal device may select a frequency domain base vector and/or a space domain base vector according to the time-varying domain base vector; alternatively, the terminal device may select the frequency domain base vector and/or the time-varying domain base vector based on the spatial base vector.
With reference to the first aspect or the second aspect, in one possible implementation manner, the target base vector combination includes a first target base vector combination and/or a second target base vector combination. The number of the base vectors in the first target base vector combination is preconfigured or received by the terminal equipment, and the number of the base vectors in the second target base vector combination is preconfigured or received by the terminal equipment. That is, the network device may configure index information for the first target base vector combination and/or the second target base vector combination, and the terminal device may instruct the first target base vector combination and/or the second target base vector combination by using feedback index information.
With reference to the first aspect or the second aspect, in one possible implementation manner, the number of base vectors in the first target matrix is B1, and the number of base vectors in the first target base vector combination corresponding to the first base vector in the first matrix is n k The first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the first target base vector combination corresponding to the first base vector is one candidate base vector combination in a third candidate set, and the number of candidate base vector combinations in the third candidate set is
With reference to the first aspect or the second aspect, in one possible implementation manner, the number of basis vectors of the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the i-th basis vector except the first basis vector in the first matrix is n i The method comprises the steps of carrying out a first treatment on the surface of the The first target base vector combination corresponding to the ith base vector is one candidate base vector combination in a fourth candidate set, and the number of candidate base vector combinations in the fourth candidate set isA1 is the number of base vectors in the first matrix, and A1 is an integer greater than 1.
With reference to the first aspect or the second aspect, in one possible implementation manner, the number of base vectors in the second target matrix is B2, and the number of base vectors in the second target base vector combination corresponding to the first base vector in the first matrix is The first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the second target base vector combination corresponding to the first base vector is one candidate base vector combination in a fifth candidate set, and the number of candidate base vector combinations in the fifth candidate set is +.>
With reference to the first aspect or the second aspect, in one possible implementation manner, the number of basis vectors of the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix isThe second target base vector corresponding to the ith base vector is combined into one candidate base vector group in the sixth candidate setThe number of candidate base vector combinations in the sixth candidate set is>A1 is the number of base vectors in the first matrix, and A1 is an integer greater than 1.
With reference to the first aspect or the second aspect, in one possible implementation manner, the target base vector combination includes a first target base vector combination and/or a second target base vector combination. The sum of the numbers of the base vectors in the first target base vector combination corresponding to each base vector in the first matrix is preconfigured or received by the terminal equipment, and the sum of the numbers of the base vectors in the second target base vector combination corresponding to each base vector in the first matrix is preconfigured or received by the terminal equipment.
With reference to the first aspect or the second aspect, in one possible implementation manner, the number of base vectors of the first matrix is A1, the number of base vectors of the first target matrix is B1, a sum of numbers of base vectors of the first target base vector combination corresponding to each base vector in the first matrix is N, and the combination of N base vectors is one candidate base vector combination in the seventh candidate set. Wherein the number of candidate base vector combinations in the seventh candidate set is
With reference to the first aspect or the second aspect, in one possible implementation manner, the number of basis vectors of the first matrix is A1, the number of basis vectors of the second target matrix is B2, and the sum of the numbers of basis vectors of the second target basis vector combination corresponding to each basis vector in the first matrix isThe combination of basis vectors is one candidate basis vector combination in the eighth candidate set. Wherein the number of candidate base vector combinations in the eighth candidate set is->
With reference to the first aspect or the second aspect, in one possible implementation manner, the target base vector combination corresponding to each base vector in the first matrix is indicated by a bit map in one or more of the following cases:
the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
The terminal equipment does not receive the number of the base vectors in the target base vector combination corresponding to each base vector in the first matrix;
the sum of the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
the terminal equipment does not receive the sum of the numbers of the base vectors in the target base vector combination corresponding to each base vector in the first matrix.
With reference to the first aspect or the second aspect, in one possible implementation manner, the first indication information is further used to indicate a position of a non-zero element in the first weighting coefficient matrix. The first weighting coefficient matrix is a weighting coefficient matrix associated with a target base vector combination corresponding to each base vector in the first matrix; or the first weighting coefficient matrix is a weighting coefficient matrix associated with the target base vector combination corresponding to all the base vectors in the first matrix.
With reference to the first aspect or the second aspect, in one possible implementation manner, a sum of dimensions of a weighting coefficient matrix associated with a target base vector combination corresponding to each base vector in the first matrix is smaller than dimensions of the weighting coefficient matrix associated with the target matrix.
With reference to the first aspect or the second aspect, in one possible implementation manner, a time-varying domain base vector in the time-varying domain matrix is used to indicate a time when the first indication information is valid. The difference between the time when the first indication information is valid and the first measurement time is a positive integer multiple of the measurement interval. The first measurement time is the time of the measurement reference signal closest to the time when the first indication information is valid, and the time when the first indication information is valid is larger than the first measurement time. The measurement interval is the difference between the moments of two adjacent measurement reference signals. That is, since the time when the first indication information is valid may be preconfigured or received by the network device, the time when the first indication information is valid is generally determined, and thus the time when the terminal device measures the reference signal last time may be determined through an interval between the time when the first indication information is valid and the time when the reference signal is measured last time.
With reference to the first aspect or the second aspect, in a possible implementation manner, the first indication information further includes a correspondence between a time-varying domain base vector in the time-varying domain matrix and the first time. The first time is a starting time for indicating that the first indication information is valid. That is, in the case where the time corresponding to the first element of the time-varying domain base vector is not I, the start time at which the first indication information is valid can be determined by the correspondence between the time-varying domain base vector and the first time.
With reference to the second aspect, in one possible implementation manner, the method further includes: the network device sends the second indication information to the terminal device. The second indication information is used for indicating the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix and/or the sum of the numbers of base vectors in the target base vector combination corresponding to each base vector in the first matrix.
In a third aspect, a communication device is provided for implementing the above methods. The communication means may be a terminal device of the first aspect, or a device comprising the terminal device, such as a chip; alternatively, the communication means may be the network device in the second aspect, or an apparatus including the network device. The communication device comprises corresponding modules, units or means (means) for realizing the method, and the modules, units or means can be realized by hardware, software or realized by executing corresponding software by hardware. The hardware or software includes one or more modules or units corresponding to the functions described above.
In some possible designs, the communication device may include a processing module and a transceiver module. The transceiver module, which may also be referred to as a transceiver unit, is configured to implement the transmitting and/or receiving functions of any of the above aspects and any possible implementation thereof. The transceiver module may be formed by a transceiver circuit, transceiver or communication interface. The processing module may be configured to implement the processing functions of any of the aspects described above and any possible implementation thereof.
In some possible designs, the transceiver module includes a transmitting module and a receiving module for implementing the transmitting and receiving functions in any of the above aspects and any possible implementation thereof, respectively.
In a fourth aspect, there is provided a communication apparatus comprising: a processor and a memory; the memory is configured to store computer instructions that, when executed by the processor, cause the communication device to perform the method of any of the above aspects. The communication means may be a terminal device of the first aspect, or a device comprising the terminal device, such as a chip; alternatively, the communication means may be the network device in the second aspect, or an apparatus including the network device.
In a fifth aspect, there is provided a communication apparatus comprising: a processor and a communication interface; the communication interface is used for communicating with a module outside the communication device; the processor is configured to execute a computer program or instructions to cause the communication device to perform the method of any of the above aspects. The communication means may be a terminal device of the first aspect, or a device comprising the terminal device, such as a chip; alternatively, the communication means may be the network device in the second aspect, or an apparatus including the network device.
In a sixth aspect, there is provided a communication apparatus comprising: at least one processor; the processor is configured to execute a computer program or instructions stored in the memory to cause the communication device to perform the method of any of the above aspects. The memory may be coupled to the processor or may be separate from the processor. The communication means may be a terminal device of the first aspect, or a device comprising the terminal device, such as a chip; alternatively, the communication means may be the network device in the second aspect, or an apparatus including the network device.
In a seventh aspect, there is provided a computer readable storage medium having stored therein a computer program or instructions which, when run on a communication device, enable the communication device to perform the method of any one of the above aspects.
In an eighth aspect, there is provided a computer program product comprising instructions which, when run on a communications apparatus, cause the communications apparatus to perform the method of any of the above aspects.
In a ninth aspect, there is provided a communications device (e.g. which may be a chip or a system of chips) comprising a processor for carrying out the functions referred to in any of the above aspects.
In some possible designs, the communication device includes a memory for holding necessary program instructions and data.
In some possible designs, the device may be a system-on-chip, may be formed from a chip, or may include a chip and other discrete devices.
It will be appreciated that when the communication device provided in any one of the third to ninth aspects is a chip, the above-described transmitting action/function may be understood as output, and the above-described receiving action/function may be understood as input.
The technical effects caused by any one of the third aspect to the ninth aspect may be referred to the technical effects caused by the different design manners in the first aspect or the second aspect, and will not be described herein.
In a tenth aspect, a communication system is provided, which includes the terminal device described in the above aspect and the network device described in the above aspect.
Drawings
FIG. 1 is a schematic diagram of non-zero elements of a weighting coefficient matrix provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a relationship between a weighting coefficient matrix associated with a target matrix and a weighting coefficient matrix associated with a target base vector corresponding to each base vector in a first matrix according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a communication system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a base station according to an embodiment of the present application;
fig. 7 is a schematic flow chart of a communication method according to an embodiment of the present application;
FIG. 8 is a schematic diagram of a weighting coefficient matrix of target matrix association according to an embodiment of the present disclosure;
Fig. 9 is a second schematic diagram of a weighting coefficient matrix associated with a target matrix according to an embodiment of the present application;
fig. 10 is a schematic diagram of a joint shift process of a frequency domain matrix and a time-varying domain matrix provided in an embodiment of the present application;
fig. 11 is a schematic diagram of a weighting coefficient matrix associated with a target base vector combination corresponding to each base vector in a first matrix according to an embodiment of the present application;
FIG. 12 is a schematic diagram of a relationship between a measurement period and a period in which first indication information is valid, provided in an embodiment of the present application;
fig. 13 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;
fig. 14 is a schematic structural diagram of a network device according to an embodiment of the present application.
Detailed Description
For the convenience of understanding the technical solutions provided in the embodiments of the present application, a brief description of the related technology of the present application is first given. Briefly described as follows:
first, precoding techniques
The precoding technology may also be called as beamforming (beamforming) technology, where a transmitting device (such as a network device) may process a signal to be transmitted by means of a precoding matrix matched to CSI under the condition that CSI is known, so that the precoded signal to be transmitted is adapted to a channel, and thus a receiving device (such as a terminal device) eliminates an influence between channels. Therefore, the received signal quality can be improved by the precoding processing of the signal to be transmitted. Furthermore, by adopting the precoding technology, the transmission of the sending device and the plurality of receiving devices on the same time-frequency resource can be realized, namely multi-user MIMO (MU-MIMO) is realized.
It should be understood that the description of the precoding technology is merely exemplary for easy understanding, and is not intended to limit the protection 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 channel information (such as, but not limited to, a channel matrix) cannot be known, precoding is performed using a pre-set precoding matrix or a weighting method. For brevity, the details thereof are not described in detail herein.
In order to facilitate understanding of the embodiments of the present application, a physical layer processing procedure of a downlink signal before transmission is briefly described below by taking a network device in a New Radio (NR) system to transmit a signal (which may also be referred to as a downlink signal) to a terminal device as an example. It should be understood that the processing of the downlink signal described below may be performed by the network device or by a chip configured in the network device. For ease of description, the following is collectively referred to as a network device.
Illustratively, the network device may process code words on the physical channel. Wherein the codeword may be encoded bits that are encoded (e.g., including channel coding). The codeword is scrambled (scrambling) to generate scrambled bits. The scrambled bits are subjected to modulation mapping (modulation mapping) to obtain modulation symbols. The modulation symbols are mapped to a plurality of layers (layers) through layer mapping (layer mapping). The modulation symbols after layer mapping are subjected to precoding (precoding) to obtain a precoded signal. The precoded signal is mapped to a plurality of Resource Elements (REs) after being mapped. These REs are then orthogonally multiplexed (orthogonal frequency division multiplexing, OFDM) modulated and transmitted through an antenna port (antenna port).
It should be understood that in the embodiments of the present application, "layer" has the same meaning as "transport layer". In other words, the "layer" and the "transmission layer" may be expressed interchangeably, and are generally described herein, and are not described in detail herein.
Second, reference Signal (RS)
The reference signal may also be referred to as a reference signal (pilot), a reference sequence, etc. In embodiments of the present application, the reference signals may include reference signals that are not precoded and reference signals that are precoded. Wherein, the precoded reference signal may also be referred to as a beamformed reference signal; alternatively, the reference signal may be simply referred to as a pre-coded reference signal. In the following embodiments, the meanings expressed by the precoded reference signal, and the beamformed reference signal are consistent and may be expressed interchangeably.
It should be appreciated that the reference signals that are not precoded may be similar to Class a reference signals defined in the long term evolution (long term evolution, LTE) or NR protocols. The beamformed reference signals may be similar to Class B (Class B) reference signals in the LTE protocol.
It should be understood that the reference signals referred to in the embodiments of the present application may be reference signals for channel measurement. For example, the reference signal may be a channel state information reference signal (CSI reference signal, CSI-RS) or a sounding reference signal (sounding reference signal, SRS). It should be understood that the above list is merely exemplary and should not be construed as limiting the embodiments of the present application in any way, which does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functionality.
Third, antenna port
An antenna port is a logical concept that can be understood as a virtual antenna that is recognized by a receiving device. Or spatially distinguishable transmit antennas. One antenna port may be configured for each virtual antenna, which may be a weighted combination of multiple physical antennas.
Alternatively, the antenna port may refer to a transmit antenna port. The transmit antenna port may refer to an actual independent transceiver unit (Tx-RU). The number of antenna ports (i.e., the number of transmit antenna ports) may be equal to the number of Tx-RUs. The reference signal for each port may be a reference signal that is not precoded.
Or, alternatively, the antenna port may refer to a reference signal port after precoding. For example, the reference signal of each port may be a precoded reference signal obtained by precoding the reference signal based on one precoding vector. The signal for each port may be transmitted through one or more Resource Blocks (RBs). It will be appreciated that if the reference signal is precoded, the reference signal port number may be less than the transmit antenna port number prior to precoding. Therefore, the dimension reduction of the transmitting antenna port can be realized by precoding the reference signal, thereby achieving the purpose of reducing the expenditure of the reference signal.
It should be understood that, in the embodiments of the present application, the meaning of "RB" and "physical resource block (physical resource block, PRB)" are the same, and may be expressed interchangeably, which is not described herein again.
It should be appreciated that the antenna ports may be distinguished by reference signals: in the downlink (the link where the network device sends signals to the terminal device), the downlink and the downlink reference signals are in one-to-one correspondence; in the uplink, uplink and uplink reference signals are in one-to-one correspondence, and if one reference signal is transmitted through a plurality of physical antennas, the plurality of physical antennas correspond to the same antenna port; if two different reference signals are transmitted through the same physical root antenna, then the antenna corresponds to two independent antenna ports.
For example, an antenna port corresponding to a demodulation reference signal (de-modulation reference signal, DMRS) may be referred to as a DMRS port, an antenna port corresponding to a CSI-RS may be referred to as a CSI-RS port, and an antenna port corresponding to an SRS may be referred to as an SRS port.
Alternatively, in the embodiment of the present application, the channel experienced by the signal transmitted via the antenna port may be estimated by the reference signal corresponding to the antenna port. Wherein table one exemplarily shows the correspondence between part of reference signals and antenna port index values in an NR system. It is to be understood that the antenna port index values in table one are merely exemplary, and may be other index values, which are not particularly limited in this embodiment of the present application.
List one
Referring to table one, PDSCH DMRS can support 12 antenna ports in an NR system. The number of layers of PDSCH transmitted by the network device is the same as the number of ports of PDSCH DMRS. That is, the network device supports transmission of up to 12 PDSCH DMRS symbol streams.
Optionally, in the embodiment of the present application, PDSCH is mainly used for downlink data transmission, and may also be used for transmission of system messages. For example, the system message may include CSI-RS resource configuration information. The CSI-RS resource configuration information is used for the terminal device to receive CSI-RS from the network device.
Referring again to table one, in an NR system, PDCCH DMRS can support 1 antenna port. The PDCCH is used for transmitting downlink control information (downlink control information, DCI). Wherein, the DCI comprises scheduling information of a PDSCH received by the terminal equipment.
Referring to table one again, in order to flexibly support different antenna structures, and considering the number of transmission channels of an antenna array, the application mode of CSI-RS (supporting narrow beam forming CSI-RS or supporting wide beam forming CSI-RS), etc., CSI-RS may support 32 antenna ports (including 1, 2, 4, 8, 12, 16, 24, and 32). The CSI-RS of 8 ports and above can support both one-dimensional and two-dimensional antenna arrays.
Illustratively, the network device transmits the CSI-RS to the terminal device. Accordingly, the terminal device receives the CSI-RS from the network device. Further, the terminal device may perform channel estimation on the CSI-RS to obtain CSI, and feed back the CSI to the network device through a physical uplink shared channel (physical uplink shared channel, PUSCH) or a physical uplink control channel (physical uplink control channel, PUCCH). Wherein the CSI may comprise one or more of: PMI, channel quality indication (channel quality indicator, CQI), CSI-RS resource indication (CSI-RS resource indicator, CRI), layer Indication (LI), rank Indication (RI), and the like.
Alternatively, the terminal device may perform channel estimation on the CSI-RS through singular value decomposition (singular value decomposition, SVD) or eigenvalue decomposition (eigen value decomposition, EVD), or the terminal device may further perform channel estimation on the CSI-RS through other manners, which is not specifically limited in the embodiments of the present application.
From the above description, it is clear that the implementation of precoding techniques relies on CSI measurement and feedback. The measurement accuracy and timely feedback of the CSI are key to effectively obtaining MIMIMIIO transmission performance. Considering that CSI requires higher measurement accuracy and lower feedback overhead, feedback of CSI in NR systems is based on implicit feedback. In implicit feedback, the terminal device feeds back the precoding matrix in the form of recommended PMI, and the network device can directly use the precoding matrix recommended by the terminal device for precoding. The terminal device determines the feedback PMI according to the codebook, wherein the feedback PMI represents a precoding matrix recommended by the terminal device, and the network device can determine a corresponding precoding matrix according to the feedback PMI according to the codebook and perform preprocessing on downlink data according to the precoding matrix. In this way, higher measurement accuracy can be fed back while lower feedback overhead is maintained.
In the implicit feedback, the emphasis is on the design of the codebook, and the codebook in the NR system is described below.
Fourth, codebook
A codebook is a set comprising a plurality of precoding matrices. Wherein the plurality of precoding matrices may be predefined. The codebook may be divided into different types, such as a type I (type I) codebook, a type II (type II) codebook, or an enhanced type II codebook, which are specified in technical specifications (technical specification, TS) 38.214 by the 3 GPP.
In Rel-16, the structure of the codebook can be expressed asWherein W is represented as a precoding matrix, +.>From two W 1 Matrix composition, wherein W 1 Representing the airspace matrix, W f Representing a frequency domain matrix>Conjugate transpose of frequency domain matrix, W 2 And the weighting coefficient matrix representing the association of the space domain matrix and the frequency domain matrix. It is understood that the precoding matrix may be expressed as a weighted sum of one or more precoding vectors. The precoding vector may be a vector composed of a spatial base vector in a spatial matrix and a frequency domain base vector in a frequency domain matrix. For example, the precoding vector may be a product of a spatial base vector and a frequency domain base vector.
In Rel-16, the structure of the codebook can be expressed asWherein W is k Represented as precoding matrix with polarization direction k, W 1 Representing the airspace matrix, W f Representing a frequency domain matrix>Conjugate transpose of frequency domain matrix, W 2,k And the weighting coefficient matrix representing the association of the space domain matrix and the frequency domain matrix. It is understood that the precoding matrix with polarization direction k may be expressed as a weighted sum of one or more precoding vectors. The precoding vector may beAnd is a vector composed of the space base vector in the space matrix and the frequency base vector in the frequency matrix. For example, the precoding vector may be a product of a spatial base vector and a frequency domain base vector. For simplicity of description, the polarization direction is not represented in the examples of the present application, i.e. the subscript k is omitted.
Spatial basis vector: (spatial domain basis vector): may also be referred to as an angle vector, a digital beam (digital beam) vector, a spatial beam basis vector, a spatial basis vector, or the like. Wherein each element in the spatial basis vector may represent a weight of each antenna port. Based on the weight of each antenna port represented by each element in the spatial basis vector, the signals of each antenna port are linearly overlapped, so that a region with stronger signals can be formed in a certain direction in space. The dimension of the spatial basis vector may represent the number of antenna ports.
Optionally, the spatial basis vector is any one of the following vectors: a discrete fourier transform (discrete fourier transform, DFT) vector, a conjugate transpose of a DFT vector, an oversampled DFT vector, a conjugate transpose of an oversampled DFT vector, or a wavelet transform (wavelet transform, WT) vector. The DFT vector may refer to a vector in the DFT matrix, the DFT conjugate transpose vector may refer to a column vector in the conjugate transpose of the DFT matrix, the oversampled DFT vector may refer to a vector in the oversampled DFT matrix, and the WT vector may refer to a column vector in the WT matrix.
Alternatively, in the embodiment of the present application, the airspace matrix W 1 A matrix of one or more spatial basis vectors may be selected from a set of spatial basis vectors. Wherein the set of spatial basis vectors may be preconfigured; alternatively, the set of spatial basis vectors may be negotiated by the terminal device and the network device; alternatively, the set of spatial basis vectors may be agreed upon, which is not specifically limited by the embodiments of the present application.
By way of example, the set of spatial basis vectors may be complete orthogonal basis matrices, such as DFT matrices, conjugate transposes of DFT matrices, oversampled DFT matrices, conjugate transposes of oversampled DFT matrices, and the like, as embodiments of the present application are not specifically limited.
Illustratively, the space-domain basis vector set has a dimension of N 1 ×N 1 . Wherein the dimension of the space domain base vector is N 1 X 1. The dimensions of the spatial basis vector may also be used to represent the number of elements in the spatial basis vector, e.g., the spatial basis vector includes N 1 The elements.
Alternatively, in the embodiment of the present application, the dimensions of the spatial base vector set may be preconfigured, or the terminal device negotiates with the network device, or the protocol is agreed, which is not specifically limited in the embodiment of the present application.
Alternatively, the airspace matrix W 1 The number of the space domain base vectors may be preconfigured or negotiated by the terminal device and the network device, which is not specifically limited in the embodiment of the present application.
Illustratively, taking a transmitting antenna as a dual polarized directional antenna, each polarization direction may select L space-basis vectors from a set of space-basis vectors.
Frequency domain basis vector (frequency domain basis vector): or delay vector, etc. A vector that can be used to represent the law of variation of the channel in the frequency domain. Each frequency domain basis vector may represent a law of variation. Since signals may travel multiple paths from the transmit antenna to the receive antenna as they travel through the wireless channel. Multipath delays cause frequency selective fading, i.e., variations in the frequency domain channel. Therefore, the change rule of the channel in the frequency domain caused by delay on different transmission paths can be represented by different frequency domain base vectors. The phase change of the channel in each frequency domain unit is related to the delay, and the time delay of the signal in the time domain can be equivalent to the phase gradual change of the frequency domain according to the knowledge of the Fourier transform. Thus, the frequency domain basis vector may also be referred to as a delay vector. In other words, the frequency domain basis vector may also be used to represent delay information of the channel.
Optionally, the frequency domain basis vector is any one of the following vectors: a DFT vector, a conjugate transpose of a DFT vector, an oversampled DFT vector, a conjugate transpose of an oversampled DFT vector, a discrete cosine change (discrete cosine transform, DCT) vector, a conjugate transpose of a DCT vector, an oversampled DCT vector, a conjugate transpose of an oversampled DCT vector. For example, the frequency domain base vector may be a DFT vector defined in type II in TS 38.
Alternatively, in the embodiment of the present application, the frequency domain matrix W f It may be a matrix of one or more frequency domain basis vectors selected from a set of frequency domain basis vectors. Wherein the set of frequency domain basis vectors may be preconfigured; alternatively, the set of frequency domain basis vectors may be negotiated by the terminal device with the network device; alternatively, the set of frequency domain basis vectors may be agreed upon, which is not specifically limited by the embodiments of the present application.
By way of example, the set of frequency domain basis vectors may be complete orthogonal basis matrices, such as DFT matrices, conjugate transposes of DFT matrices, oversampled DFT matrices, conjugate transposes of oversampled DFT matrices, and the like, as embodiments of the present application are not particularly limited.
Illustratively, the set of frequency-domain basis vectors has a dimension of N 3 ×N 3 . Wherein the dimension of the frequency domain base vector is N 3 ×1。
Alternatively, in the embodiment of the present application, the dimensions of the frequency domain base vector set and the number of base vectors may be preconfigured, or the terminal device and the network device negotiate, or the protocol agree, which is not specifically limited in the embodiment of the present application.
Alternatively, in the embodiment of the present application, the frequency domain matrix W f The number of the basis vectors in the mid-frequency domain may be preconfigured or negotiated by the terminal device and the network device, which is not particularly limited in the embodiment of the present application.
Alternatively, in the embodiment of the present application, the frequency domain matrix W f The number of basis vectors in the medium frequency domain may be the same as the number of frequency domain units.
Alternatively, in the embodiment of the present application, the frequency domain unit may refer to one or more consecutive PRBs. Wherein the size of the frequency domain unit (i.e. the number of PRBs included) is related to the bandwidth of the bandwidth part (bandwidth part). Referring to table two, the frequency domain unit size including two candidates for each BWP bandwidth configuration may be configured through radio resource control (radio resource control, RRC) signaling. When the number of PRBs in BWP is smaller than 24, the frequency domain unit configuration is not applied. For example, taking 24 PRBs as an example in the BWP size in table two, the BWP bandwidth configuration may include 6 frequency domain units (the frequency domain unit size is 4 PRBs); alternatively, the BWP bandwidth configuration may include 3 frequency domain units (the frequency domain unit size is 8 PRBs).
Watch II
BWP size (number of PRBs) Frequency domain unit size (PRB number)
<24 Is not suitable for
24～72 4，8
73～144 8，16
145～275 16，32
Optionally, the frequency domain parameters of the CSI include PMI granularity and CSI reporting frequency band. If the PMI granularity is broadband, the terminal equipment reports a broadband PMI according to the whole reporting frequency band; if the PMI granularity is a frequency domain unit, for a 2-antenna port, the terminal equipment reports the PMI corresponding to each frequency domain unit according to each frequency domain unit in a reporting frequency band; for 4 antenna ports and above, the terminal equipment reports a wideband PMI according to the whole reporting frequency band, and reports a PMI corresponding to each frequency domain unit according to each frequency domain unit in the reporting frequency band. The reporting frequency band is a frequency domain unit set in BWP, the number of frequency domain units in the frequency domain unit set is determined by parameters in CSI reporting setting, and multiple frequency domain units in the frequency domain unit set may be continuous or discontinuous in frequency domain.
It should be understood that in the embodiments of the present application, the meaning between the "frequency domain unit" and the "subband" is the same, and the two can be replaced by each other, which is generally described herein, and will not be described in detail.
Weighting coefficient matrix W 2 : may be used to indicate the weighting coefficients for each precoding vector. Wherein, because the channels have frequency selectivity, the optimal wave beams corresponding to different channels are different. Thus W is 2 The role of the midamble vector selection is to select one beam (i.e., spatial basis vector) for one frequency domain element from within the spatial matrix. Different frequency domain elements may select different beams. For f < th) 0 Precoding matrix of individual frequency domain unitsCan be expressed as +.>
Optionally, in the embodiment of the present application, a weighting coefficient corresponding to one precoding vector corresponds to W 2 Is an element of the group. Exemplary, FIG. 1 is a weighting coefficient matrix W 2 Non-zero element schematic diagram. Wherein the blocks in FIG. 1 are used to represent W 2 Is an element of the group. Filled circles are used to represent non-zero elements. W (W) 2 The total number of the elements is the product of the number of the space-domain basis vectors in the space-domain matrix and the number of the frequency-domain basis vectors in the frequency-domain matrix.
It will be appreciated that W 2 The zero element (i.e., the element whose magnitude or modulus is zero) may indicate that the weighting coefficient of the precoding vector corresponding to the element is zero. Wherein W is 2 May be used to indicate a spatial basis vector selected based on the frequency domain basis vector.
Alternatively, in the embodiment of the present application, the weighting coefficient may be a complex number. Wherein the weighting coefficients may be expressed in the form of real and imaginary parts; alternatively, the weighting coefficients may be represented in the form of amplitude and phase, which is not particularly limited in the embodiment of the present application. Illustratively, for an enhanced type II codebook, the weighting coefficients are complex.
Or, alternatively, the weighting coefficients in embodiments of the present application may be real numbers. Illustratively, for a type I codebook, the weighting coefficients are real numbers.
Fifth, PMI
The PMI can be in the form of index to indicate the airspace matrix, frequency domain matrix and W selected by the terminal equipment 2 Non-zero element position in (a), or W 2 The position of the element with the largest amplitude. The indicating overhead of the PMI is related to the number of the base vectors in the space domain base vector set, the space domain matrix, the frequency domain base vector set and the frequency domain matrix.
In TS 38 214, PMI may employ parameter set i 1 Indicating the airspace matrix, the frequency domain matrix and the W selected by the terminal equipment 2 Non-zero element position, or W 2 The position of the element with the largest amplitude. Wherein parameter i 1,1 And i 1,2 May be used to indicate the spatial matrix selected by the terminal device. Parameter i 1,5 And i 1,6,l May be used to indicate the spatial matrix selected by the terminal device. Parameter i 1,7,l Can be used for indicating W 2 Non-zero element positions. Parameter i 1,8,l Can be used for indicating W 2 The position of the element with the largest amplitude. l is used to denote the index of the transport layer, l=1, …, v denotes the number of transport layers. Concerning the above parameter i 1,1 、i 1,2 、i 1,5 、i 1,6,l 、i 1,7,l And i 1,8,l See the description in TS 38 214, which is not repeated here.
Sixth, medium-high speed CSI codebook structure
One goal of 3GPP in Rel-18 MIMO subject to propose CSI enhancement is: the problem that the time-varying CSI in a medium-high speed mobile scene is rapid and the fed-back PMI is easy to expire is solved, and an enhanced CSI measurement method and an enhanced codebook structure are provided.
Wherein the enhanced codebook structure can be determined by formula (1). The formula (1) is as follows:
see formula (1), W, W 1 、W 2 W is provided f The same definitions as in Rel-16 apply in particular to the description above. Wherein W is d Is a time-varying domain matrix used to represent channel time-varying information. The time-varying domain matrix W d And a frequency domain matrix W f The joint matrix can be constructed by kronecker product. Of course, the time-varying domain matrix W d And a frequency domain matrix W f The joint matrix may also be formed by other coupling means. That is, the joint matrix includes a time-varying domain matrix W d And a frequency domain matrix W f 。
Time-variant domain basis vector: can be used to represent the channel variation in the time domain. Each time-varying domain basis vector may represent a law of variation of the channel over time. The radio channel is a time-varying channel that suffers from fading losses from different paths. For example, a time-frequency dual selective fading channel, which is commonly affected by frequency selective fading due to multipath delay spread and time selective fading due to doppler shift, is a typical time-varying channel.
Alternatively, doppler shift (doppler shift) may refer to a frequency offset between a transmit frequency and a receive frequency caused by relative movement between a terminal device and a network device, the difference between the receive frequency and the transmit frequency being referred to as the doppler shift. In general, the Doppler shift may be f d Can be defined as f d ＝v×f c X cos θ/c. Wherein v is the moving speed of the terminal equipment, f c For the carrier frequency, θ is the incident angle of the multipath signal, and c is the speed of light. In particular, θ may consider the angles of incidence of different transmission paths, and due to the different θ of the multipath, different transmission paths may correspond to different doppler shifts, thereby causing doppler spread (doppler spread). In general, the magnitude of the doppler shift indicates the effect of the moving speed on the time domain variation of the channel.
Alternatively, in embodiments of the present application, each time-varying domain basis vector may correspond to one doppler shift. Therefore, the change rule of the channel in the time domain caused by the Doppler frequency shift of different transmission paths can be represented by different time-varying domain basis vectors. Generally, to facilitate describing the variation in the time domain of the channel, the time domain channel may be projected to the Doppler domain and represented by a weighted function of several exponential functions of the slowly varying Doppler frequency shifts.
Optionally, the time-varying domain basis vector is one or more of a DFT vector, an oversampled DFT vector, a WT vector, or an oversampled WT vector, which embodiments of the present application do not limit.
Optionally, in an embodiment of the present application, the time-varying domain matrix W d It may be a matrix of one or more time-varying domain basis vectors selected from a set of time-varying domain basis vectors. Wherein the set of time-varying domain basis vectors may be preconfigured; alternatively, the set of time-varying domain basis vectors may be negotiated by the terminal device with the network device; alternatively, the set of time-varying domain basis vectors may be protocol-agreed, which is not specifically limited by the embodiments of the present application.
By way of example, the set of time-varying domain basis vectors may be a complete orthogonal basis matrix, such as a DFT matrix, a conjugate transpose of a DFT matrix, an oversampled DFT matrix, a conjugate transpose of an oversampled DFT matrix, and the like, as embodiments of the present application are not specifically limited.
Illustratively, the time-varying domain basis vector set has a dimension of N 4 ×N 4 . Wherein the dimension of the time-varying domain base vector is N 4 X 1. The dimension of the time-varying domain base vector may also be used to represent the number of elements in the time-varying domain base vector, e.g., the time-varying domain base vector includes N 4 The elements. The N is 4 ×N 4 The set of time-varying domain basis vectors of a dimension can be understood as: dividing the maximum Doppler shift D into N 4 Parts of N 4 N in a set of dimensional time-varying domain basis vectors 4 Individual time-varying domain basis vectors and N 4 The doppler shifts correspond.
Alternatively, in the embodiment of the present application, the dimensions of the set of time-varying domain base vectors may be preconfigured, or the terminal device negotiates with the network device, or the protocol is agreed, which is not specifically limited in the embodiment of the present application.
Optionally, in an embodiment of the present application, the time-varying domain matrix W d The number of the time-varying domain base vectors may be preconfigured or negotiated by the terminal device and the network device, which is not particularly limited in the embodiment of the present application.
It should be understood that the time-varying domain base vector is defined only for the convenience of distinguishing from the spatial domain base vector and the frequency domain base vector described later, and should not constitute any limitation to the embodiments of the present application. Embodiments of the present application do not exclude the possibility of defining other names for time-variant domain basis vectors in future protocols to represent the same or similar meaning thereto. For example, it may also be referred to as a doppler vector, or a doppler basis vector.
Optionally, in an embodiment of the present application, each time-varying domain basis vector in the set of time-varying domain basis vectors corresponds to a value of one or more of the following: prediction, measurement duration, reference signal time domain density, reference signal transmission times, and reference signal transmission period. The description of the measurement time period, the reference signal time domain density, the reference signal transmission number, and the reference signal transmission period is referred to as the description of the correlation hereinafter.
Reference signal transmission period: the time of the interval between two adjacent reference signal transmissions.
Reference signal time domain density: a number of times the reference signal is transmitted within a predefined one time unit; or, the ratio of the time domain resource used for the current transmission of the reference signal to the time unit. One time unit may include one or more reference signal transmission periods, and the corresponding reference signal time domain density may be 1 or greater than 1, for example.
Measuring the time length: in the embodiment of the present application, the terminal device may perform CSI measurement in a certain period according to the indication of the network device. Wherein the period may be referred to as a measurement duration. The length of time of the period may be indicated by the network device by signaling, e.g., by higher layer signaling (e.g., RRC message, DCI, etc.). The measurement duration may also be predefined, as predetermined by the protocol; alternatively, the measurement duration may be negotiated by the terminal device and the network device, which is not limited in the embodiment of the present application.
Optionally, in the embodiment of the present application, the network device may signal the starting time and/or duration of the period to the terminal device; alternatively, the network device may trigger the terminal device to start channel measurement through signaling. The terminal device may receive the reference signal used for CSI measurement multiple times within the measurement period, and may perform CSI measurement based on the reference signal received multiple times, so as to feed back CSI to the network device.
Optionally, in the embodiment of the present application, signaling, by the network device to start channel measurement by the terminal device may refer to: the terminal device performs channel measurement based on the received reference signal within a time window after the start time or trigger time indicated by the network device. Wherein the size of the time window, i.e. the measurement duration.
Optionally, in the embodiment of the present application, the terminal device may receive the reference signal multiple times during the measurement period. The number of times the terminal device receives the reference signal within the measurement period may be the product of the measurement period and the time unit multiplied by the time domain density of the reference signal.
In this embodiment of the present application, the correspondence between the time-varying domain base vector and the above measurement duration, the reference signal time domain density, the reference signal transmission times, and the reference signal transmission period value is as follows:
when the reference signal transmission times are more, the time-varying domain base vector set with larger dimension can be corresponding; and when the transmission times of the reference signals are smaller, the reference signals can correspond to the time-varying domain base vector set with smaller dimension.
When the measurement time is longer under the condition of a reference signal transmission period or a certain reference signal time domain density, the number of times of the reference signal received by the terminal equipment is also more, and the time-varying domain base vector set with larger dimension can be corresponding; when the measurement duration is shorter, the number of times of reference signals received by the terminal equipment is also smaller, and the time-varying domain base vector set with smaller dimension can be corresponding.
When the time domain density of the reference signal is larger under the condition that the measurement duration is certain, the number of times of the reference signal received by the terminal equipment in a period of time (such as the measurement duration) is also larger, and the time-varying domain base vector set with larger dimension can be corresponding; when the time domain density of the reference signal is smaller, the number of times of receiving the reference signal in the same period of time by the terminal equipment is also smaller, and the time-varying domain base vector set with smaller dimension can be corresponding.
When the measurement duration is certain and the reference signal transmission period is relatively long, the number of times of the reference signal received by the terminal equipment in a period of time (such as the measurement duration) is relatively small, and the time-varying domain base vector set with relatively small dimension can be corresponding; and when the reference signal transmission period is smaller, the number of times of the reference signal received by the terminal equipment in the same period is more, and the time-varying domain base vector set with larger dimension can be corresponding.
Of course, the above factors may be combined. For example, the dimensions of the set of time-varying domain basis vectors may correspond to a measurement duration and a reference signal transmission period; alternatively, the dimensions of the set of time-varying domain basis vectors may correspond to a measurement duration and a reference signal time domain density, etc. For brevity, no one-to-one illustration is provided herein.
Or, optionally, in the embodiment of the present application, each time-varying domain base vector in the set of time-varying domain base vectors corresponds to a time when the PMI is valid. The number of the effective time points of the PMI corresponds to the number of the time-varying domain base vectors one by one. The time when the PMI is valid may refer to a time when the network device may use a precoding matrix corresponding to the PMI to precode the downlink signal, and the time when the PMI is valid is greater than a time when the reference signal is measured or a time when the reference signal is received.
In one possible implementation, the number of times when the PMI is valid may be smaller than the number of elements in the time-varying domain base vector. The time corresponding to the first element in the time-varying domain base vector may be smaller than the effective start time of the PMI. That is, the number of elements in the time-varying domain base vector may be greater than the number of times when the PMI is valid, and thus the resolution of the time-varying domain base vector may be increased.
Alternatively, in the embodiment of the present application, the number of times at which the PMI is valid may be preconfigured; alternatively, the number of times at which the PMI is valid may be negotiated by the terminal device and the network device, which is not specifically limited in the embodiment of the present application.
It should be understood that the factors listed above in relation to the time-varying domain basis vector dimensions are merely examples and should not constitute any limitation to the embodiments of the present application. Equivalent substitutions for the above factors may be made by those skilled in the art based on the same conception, and all such equivalent changes should be considered to fall within the scope of the present application.
Alternatively, in the embodiment of the present application, the spatial matrices corresponding to different transmission layers may be different. The frequency domain matrices corresponding to different transport layers may be different. The time-varying domain matrices corresponding to different transport layers may be different.
Alternatively, in the embodiment of the present application, the spatial matrices corresponding to different frequency domain units may be different, and the frequency domain matrices corresponding to different frequency domain units may be different. The time-varying domain matrices corresponding to different frequency domain units may be different.
Optionally, in the embodiment of the present application, the number of space-domain base vectors in the space-domain matrix corresponding to different transmission layers may be the same; or the number of the frequency domain base vectors in the frequency domain matrix corresponding to different transmission layers can be the same; alternatively, the number of time-varying domain basis vectors in the time-varying domain matrix corresponding to different transport layers may be the same.
The codebook structure of Rel-16 and the middle-high PMI codebook structure corresponding to formula (1) are as described above, W in formula (1) 2 The matrix on the right side is a product of mutual coupling of the frequency domain matrix and the time-varying domain matrix, rel-16 cannot indicate the selection condition of the joint matrix, delay information and time-varying information of a channel cannot be indicated, and if the time-varying domain base vector in the time-varying domain matrix is directly indicated, larger indication overhead is brought.
In view of this, the embodiments of the present application provide a communication method, which may indicate delay information and time-varying information of a channel with a smaller indication overhead.
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In order to facilitate understanding of the embodiments of the present application, the following description is made before describing the embodiments of the present application.
1. For easy understanding and description, first, the main parameters involved in the embodiments of the present application are respectively described as follows:
N 1 : can represent the dimension of the space base vector, N 1 Equal to the number of antenna ports, N 1 Is an integer greater than 1.
L: can represent the airspace matrix W 1 The number of the space-domain base vectors is L which is an integer greater than or equal to 1 and is less than N 1 . Wherein N is 1 X L may represent the spatial matrix W 1 Is a dimension of (c).
N 3 : can represent the dimension of the frequency domain basis vector, N 3 May be equal to the number of frequency domain units. N (N) 3 Is an integer greater than 1.
M v : can represent a frequency domain matrix W f The number of the medium frequency domain base vectors, M v Is an integer greater than or equal to 1, M v Less than N 3 。N 3 ×M v Can represent a frequency domain matrix W f Is a dimension of (c).
N 4 : can represent the dimension, N, of the time-varying domain basis vector 4 The number of times greater than or equal to the time when the PMI is valid. N (N) 4 Is an integer greater than 1.
M p : can represent a time-varying domain matrix W d The number of the time-varying domain base vectors, M p Is an integer greater than or equal to 1, M p Less than N 4 。N 4 ×M p Can represent a time-varying domain matrix W d Is a dimension of (c).
W csi : the number of times when PMI is valid, W csi Is an integer of 1 or more.
k x : represents N 3 Frequency domain basis vector set of dimensions kth x Column frequency domain basis vector, x ε {1,2, …, N 3 }. Wherein k is x Can be associated with the kth x Delay represented by column frequency domain basis vectorThe time information corresponds.
Represents N 4 The +.>Column time-varying domain basis vectors y e {1,2, …, n 4 }。/>Can be in line with the->The Doppler information represented by the column time-varying domain basis vectors corresponds.
A1: the number of base vectors in the first matrix, A1 is an integer greater than or equal to 1.
B1: and B1 is an integer greater than or equal to 1.
B2: and B2 is an integer greater than or equal to 1.
n k : the number of base vectors in the first target base vector combination corresponding to the first base vector in the first matrix, n k Is an integer greater than or equal to 1, n k Less than or equal to B1.
The number of basis vectors in the second target basis vector combination corresponding to the first basis vector in the first matrix, is >Is an integer greater than or equal to 1, +.>Less than or equal to B2.
n i : first order corresponding to the i-th basis vector except the first basis vector in the first matrixNumber of basis vectors in basis vector combination, n i Is an integer greater than or equal to 1, n i Less than or equal to B1, i ε {1,2, …, A1-1}.
The number of basis vectors in the second target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix, < ->Is an integer greater than or equal to 1, +.>Less than or equal to B2, i ε {1,2, …, A1-1}.
N: and the sum of the numbers of the base vectors of the first target base vector combination corresponding to each base vector in the first matrix is that N is an integer greater than 1 and N is less than or equal to A1B1.
Sum of the number of basis vectors of the second target basis vector combination corresponding to each basis vector in the first matrix,/for each of the basis vectors>Is an integer greater than 1, ">Less than or equal to A1B2.
The above-mentioned "first matrix", "first base vector", "first target base vector combination", and "second target base vector combination" will be described in detail in the following embodiments, and will not be described herein.
2. In the embodiment of the present application, for convenience of description, when numbering is referred to, numbering may be performed continuously starting from 1. For example M p The time-varying domain base vectors include time-varying domain base vector #1 to time-varying domain base vector #M p . And so on, no longerOne example is illustrated. Of course, the specific implementation is not limited to this, and for example, the serial numbers may be numbered from 0. For example M p The time-varying domain base vectors include time-varying domain base vector #0 through time-varying domain base vector #M p -1. It should be understood that the foregoing is provided for the purpose of describing the embodiments of the present application, and is not intended to limit the scope of the present application.
3. In the present embodiments, a number of points are involved in the transformation of matrices and vectors. For ease of understanding, a unified description is provided herein. The superscript T denotes transposition, e.g. Q T Representing a transpose of matrix (or vector) Q; the upper corner mark H represents the conjugate transpose, e.g. Q H Representing the conjugate transpose of the matrix (or vector) Q. Hereinafter, for the sake of brevity, description of the same or similar cases will be omitted.
4. In the embodiments of the present application,n-! N (n-1) (n-2.1, m-! =m (m-1) (m-2) is 1, and the total number of the components is 1, (n-m) ++! =n (n-1) (n-2) · (n-m+1), n++m. Wherein (1)>Can also be expressed as +.>
5. In the embodiments of the present application, a description of "weighting coefficient matrix associated with target matrix" is referred to in various places. Wherein the weighting coefficient matrix associated with the target matrix may refer to the target matrix and the airspace matrix W 1 Jointly formed weighting coefficient matrix W 2 . The weighting coefficient matrix W 2 A matrix of sub-weighting coefficients corresponding to each basis vector may be included. The dimensions of the sub-weighting coefficient matrix corresponding to each base vector are the same. The basis vector may be one of a frequency domain basis vector, a time-varying domain basis vector, or a spatial domain basis vector.
Illustratively, taking the base vector as the frequency domain base vector, and the frequency domain matrix includes a base vector #1, a base vector #2, and a base vector #3 as an example, fig. 2 illustrates a relationship between the weighting coefficient matrix associated with the target matrix and the sub-weighting coefficient matrix corresponding to each base vector. As shown in fig. 2, the sub-weighting coefficient matrix corresponding to the base vector #1 may be represented as a sub-weighting coefficient matrix #1. By analogy, the sub-weighting coefficient matrix corresponding to the base vector #2 is denoted as a sub-weighting coefficient matrix #2, the sub-weighting coefficient matrix corresponding to the base vector #3 is denoted as a sub-weighting coefficient matrix #3, and the sub-weighting coefficient matrices #1 to #3 constitute the weighting coefficient matrix associated with the target matrix.
6. In the embodiment of the application, the "indication" may include a direct indication and an indirect indication, and may also include an explicit indication and an implicit indication. The information indicated by a certain information (hereinafter, first indication information) is referred to as information to be indicated, and in a specific implementation process, there are various ways of indicating the information to be indicated, for example, but not limited to, the information to be indicated may be directly 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 indicated indirectly by indicating other information, wherein the other information and the information to be indicated have an association relation. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, the indication of the specific information may also be achieved by means of a pre-agreed (e.g., protocol-specified) arrangement sequence of the respective information, thereby reducing the indication overhead to some extent. And meanwhile, the universal part of each information can be identified and indicated uniformly, so that the indication cost caused by independently indicating the same information is reduced.
The specific indication means may be any of various existing indication means, such as, but not limited to, the above indication means, various combinations thereof, and the like. Specific details of various indications may be referred to the prior art and are not described herein. As can be seen from the above, for example, when multiple pieces of information of the same type need to be indicated, different manners of indication of different pieces of information may occur. In a specific implementation process, a required indication mode can be selected according to specific needs, and in this embodiment of the present application, the selected indication mode is not limited, so that the indication mode according to the embodiment of the present application should be understood to cover various methods that can enable a party to be indicated to learn information to be indicated.
In addition, there may be other equivalent forms of the information to be indicated, for example, a base vector (for example, a spatial base vector, a frequency domain base vector, or a time-varying domain base vector) in the embodiment of the present application may be represented as a row vector or a column vector. For another example, a matrix may be represented by a transposed matrix of the matrix, a matrix may be represented by a vector or an array of vectors, each of which may be formed by interconnecting respective row vectors or column vectors of the matrix, a kronecker product of two vectors may be represented by a product of one vector and a transposed vector of the other vector, or 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 of the embodiments of the present application should be understood to encompass various manifestations of such features.
It should be understood that the information to be indicated may be sent together as a whole or may be sent separately in a plurality of sub-information, and the sending periods and/or sending timings of these sub-information may be the same or different. The specific transmission method is not limited in this embodiment. The transmission period and/or the transmission timing of the sub-information may be predefined, for example, predefined according to a protocol, or may be configured by the transmitting end device by transmitting configuration information to the receiving end device. The configuration information may include, for example, but not limited to, radio resource control signaling, such as one or a combination of at least two of RRC signaling, medium access control (media access control, MAC) layer signaling, physical layer signaling, or DCI, among others.
7. The "pre-defining" or "pre-configuring" may be implemented by pre-storing corresponding codes, tables, or other manners in which related information may be indicated in devices (including, for example, terminal devices and network devices), and embodiments of the present application are not limited to specific implementations thereof. Where "save" may refer to saving in one or more memories. The one or more memories may be provided separately or may be integrated in an encoder or decoder, processor, or communication device. The one or more memories may also be provided separately as part of a decoder, processor, or communication device. The type of memory may be any form of storage medium, and embodiments of the present application are not limited in this regard.
8. 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 related protocols applied in a future communication system, which is not limited in the embodiments of the present application.
9. In the embodiments of the present application, the descriptions of "when … …", "in the case of … …", "if" and "if" refer to that the device (e.g., the terminal device or the network device) will perform the corresponding processing under some objective condition, which is not limited in time, and does not require that the device (e.g., the terminal device or the network device) must have a judging action when implementing, and does not mean that there is any other limitation.
10. In the description of the present application, unless otherwise indicated, "/" means that the associated object is an "or" relationship, e.g., a/B may represent a or B; in the embodiment of the present application, "and/or" is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. Also, in the description of the embodiments of the present application, unless otherwise indicated, "a plurality" means two or more than two. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", and the like are used to distinguish the same item or similar items having substantially the same function and effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ. Meanwhile, in the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion that may be readily understood.
The technical scheme of the embodiment of the application can be applied to various communication systems. For example: orthogonal frequency division multiple access (orthogonal frequency-division multiple access, OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems, among others. The term "system" may be used interchangeably with "network". OFDMA systems may implement wireless technologies such as evolved universal wireless terrestrial access (evolved universal terrestrial radio access, E-UTRA), ultra mobile broadband (ultra mobile broadband, UMB), and the like. E-UTRA is an evolved version of the universal mobile telecommunications system (universal mobile telecommunications system, UMTS). Various releases of 3GPP in, LTE and LTE-based evolution are new versions using E-UTRA. The 5G communication system is the next generation communication system under study. The 5G communication system includes a non-independent Networking (NSA) 5G mobile communication system, an independent networking (SA) 5G mobile communication system, or an NSA 5G mobile communication system and an SA 5G mobile communication system. In addition, the communication system can be also suitable for future communication technologies, and the technical scheme provided by the embodiment of the application is applicable. The above-mentioned communication system to which the present application is applied is merely illustrative, and the communication system to which the present application is applied is not limited thereto, and is generally described herein, and will not be described in detail.
In addition, the communication architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and as a person of ordinary skill in the art can know, with evolution of the communication architecture and appearance of a new service scenario, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.
As shown in fig. 3, a communication system provided in an embodiment of the present application includes a terminal device and a network device.
In a possible implementation manner, the terminal device generates first indication information and sends the first indication information to the network device. The first indication information is used for indicating a joint matrix selected by the terminal equipment, the joint matrix comprises a frequency domain matrix and a time-varying domain matrix, and the first indication information comprises indication information of base vectors except for a first frequency domain base vector in the frequency domain matrix and indication information of base vectors except for the first time-varying domain base vector in the time-varying domain matrix.
Specific implementations of the above schemes will be described in detail in the following embodiments, which are not described herein.
In this embodiment of the present application, the joint matrix including the frequency domain matrix and the time-varying domain matrix may be indicated by the indication information of the basis vectors other than the first frequency domain basis vector in the frequency domain matrix and the indication information of the basis vectors other than the first frequency domain basis vector in the time-varying domain matrix, that is, all the frequency domain basis vectors in the frequency domain matrix and all the time-varying domain basis vectors in the time-varying domain matrix may not be indicated, so the indication overhead may be reduced, and the delay information of the channel may be indicated by the frequency domain matrix in the joint matrix, and the time-varying information of the channel may be indicated by the time-varying domain matrix in the joint matrix. In summary, according to the communication method provided by the embodiment of the application, the delay information and the time-varying information of the channel can be indicated through smaller indication overhead.
Alternatively, the terminal device in the embodiment of the present application may be a device for implementing a wireless communication function, for example, a terminal or a chip that may be used in the terminal. The terminal may be a User Equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a remote terminal, a mobile device, a wireless communication device, a terminal agent, a terminal apparatus, or the like in a 5G network or a future evolved public land mobile network (public land mobile network, PLMN). An access terminal may be a cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication capability, computing device or other processing device connected to a wireless modem, vehicle-mounted device or wearable device, virtual Reality (VR) terminal device, augmented reality (augmented reality, AR) terminal device, wireless terminal in industrial control (industrial control), wireless terminal in self-driving (self-driving), wireless terminal in telemedicine (remote medium), wireless terminal in smart grid (smart grid), wireless terminal in transportation security (transportation safety), wireless terminal in smart city (smart city), wireless terminal in smart home (smart home), etc. Alternatively, the terminal device may be mobile or fixed.
Alternatively, the network device in the embodiment of the present application may be a device that communicates with the terminal device. The network device may include a transmission reception point (transmission and reception point, TRP), a base station, a remote radio unit (remote radio unit, RRU) or baseband unit (BBU) of a separate base station (also referred to as Digital Unit (DU)), a broadband network traffic gateway (broadband network gateway, BNG), an aggregation switch, a non-3 GPP access device, a relay station or access point, and so on. In fig. 3, a network device is taken as an example of a base station, which is generally described herein, and will not be described in detail. In addition, the base station in the embodiment of the present application may be a base transceiver station (base transceiver station, BTS) in a global system for mobile communications (global system for mobile communication, GSM) or code division multiple access (code division multiple access, CDMA) network, an NB (Node B) in wideband code division multiple access (wideband code division multiple access, WCDMA), an eNB or eNodeB (evolutional NodeB) in LTE, a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, a base station in a 5G communication system, or a base station in a future evolution network, etc., which is not particularly limited herein.
Alternatively, in the embodiment of the present application, both the network device and the terminal device may be configured with multiple antennas to support MIMO technology. Furthermore, the network device and the terminal device can support both single-user MIMO (SU-MIMO) technology and MU-MIMO technology. Among other things, MU-MIMO technology may be implemented based on spatial division multiple access (space division multiple access, SDMA) technology. The network device and the terminal device may also flexibly support single-in single-out (Single Input Single Output, SISO) technology, single-in multiple-out (Single Input multiple Output, SIMO) and multiple-in single-out (multiple Input Single Output, MISO) technology due to the configuration of multiple antennas, to implement various diversity (e.g., without limitation, transmit diversity and receive diversity) and multiplexing technologies, which may include, without limitation, transmit diversity (transmit diversity, TD) technology and receive diversity (receive diversity, RD) technology, and the multiplexing technology may be spatial multiplexing (spatial multiplexing) technology. And the various techniques described above may also include a variety of implementations, for example, transmit diversity techniques may include, but are not limited to: space-time transmit diversity (STTD), space-frequency transmit diversity (space-frequency transmit diversity, SFTD), time-switched transmit diversity (time switched transmit diversity, TSTD), frequency-switched transmit diversity (frequency switch transmit diversity, FSTD), orthogonal transmit diversity (orthogonal transmit diversity, OTD), cyclic delay diversity (cyclic delay diversity, CDD), and the like, and diversity obtained by deriving, evolving, and combining the above diversity methods. For example, currently, the LTE standard adopts a transmit diversity scheme such as space-time block coding (space time block coding, STBC), space-frequency block coding (space frequency block coding, SFBC), and CDD. The transmit diversity has been generally described above by way of example. It will be appreciated by those skilled in the art that transmit diversity includes a variety of other implementations in addition to the examples described above. Therefore, the above description should not be construed as limiting the technical solutions provided by the embodiments of the present application, which should be construed as being applicable to various possible transmit diversity schemes.
Optionally, the network device and/or the terminal device in the embodiments of the present application have a function of processing a baseband signal, for example, may have one or more functions of coding (coding), rate matching (rate matching), scrambling (scrambling), modulation (modulation), and layer mapping in a downlink direction; the upstream direction may have one or more of decoding (coding), rate de-matching (rate de-scrambling), de-scrambling (de-modulation), demodulation (de-modulation), channel estimation (channel estimation)/equalization (equalization).
Optionally, the network device and/or the terminal device in the embodiments of the present application have processing functions for processing intermediate frequency signals and/or radio frequency signals, and providing a part of baseband signals, for example, may have one or more functions of resource mapping (resource element mapping), digital beamforming (digital beam forming, DBF), inverse fast fourier transform (inverse fast fourier transformation, IFFT) and cyclic prefix addition (cyclic prefix addition), analog beamforming (analog beam forming, ABF), analog-to-digital conversion (analog to digital) in the downlink direction; the upstream direction may have one or more of fast fourier transform (fast fourier transformation, FFT) and band cyclic prefix removal (cyclic prefix removal), analog beamforming, analog-to-digital conversion, digital beamforming, resource demapping (resource element de-mapping).
Alternatively, the network device and the terminal device in the embodiments of the present application may also be referred to as a communication apparatus, which may be a general-purpose device or a special-purpose device, which is not specifically limited in the embodiments of the present application.
Optionally, the related functions of the terminal device or the network device in the embodiments of the present application may be implemented by one device, or may be implemented by multiple devices together, or may be implemented by one or more functional modules in one device, which is not specifically limited in the embodiments of the present application. It will be appreciated that the above described functionality may be either a network element in a hardware device, or a software functionality running on dedicated hardware, or a combination of hardware and software, or a virtualized functionality instantiated on a platform (e.g., a cloud platform).
For example, the related functions of the terminal device or the network device in the embodiments of the present application may be implemented by the communication apparatus 400 in fig. 4. Fig. 4 is a schematic structural diagram of a communication device 400 according to an embodiment of the present application. The communication device 400 includes one or more processors 401, communication lines 402, and at least one communication interface (shown in fig. 4 by way of example only as including a communication interface 404, and one processor 401, as an example), and optionally may also include memory 403.
The processor 401 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application Specific Integrated Circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application.
Communication line 402 may include a passageway for connecting between the various components.
The communication interface 404, which may be a transceiver module, is used to communicate with other devices or communication networks, such as ethernet, RAN, wireless local area network (wireless local area networks, WLAN), etc. For example, the transceiver module may be a device such as a transceiver or a transceiver. Optionally, the communication interface 404 may also be a transceiver circuit located in the processor 401, so as to implement signal input and signal output of the processor.
The memory 403 may be a device having a memory function. For example, but not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via communication line 402. The memory may also be integrated with the processor.
The memory 403 is used for storing computer-executable instructions for executing the embodiments of the present application, and is controlled by the processor 401 to execute the instructions. The processor 401 is configured to execute computer-executable instructions stored in the memory 403, thereby implementing the communication method provided in the embodiment of the present application.
Alternatively, in the embodiment of the present application, the processor 401 may perform functions related to processing of a communication method provided in the embodiment of the present application, where the communication interface 404 is responsible for communicating with other devices or a communication network, and the embodiment of the present application is not limited in detail.
Optionally, the memory 403 in the embodiment of the present application may also be used to store information or parameters described in the embodiment described below, such as the first indication information.
Computer-executable instructions in embodiments of the present application may also be referred to as application code, which embodiments of the present application are not particularly limited.
In a particular implementation, processor 401 may include one or more CPUs, such as CPU0 and CPU1 of FIG. 4, as an embodiment.
In a particular implementation, as one embodiment, the communication apparatus 400 may include a plurality of processors, such as the processor 401 and the processor 408 in fig. 4. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
In a specific implementation, as an embodiment, the communication apparatus 400 may further include an output device 405 and an input device 406. The output device 405 communicates with the processor 401 and may display information in a variety of ways.
The communication device 400 may be a general-purpose device or a special-purpose device. For example, the communication apparatus 400 may be a desktop computer, a portable computer, a web server, a palm top computer (personal digital assistant, PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a device having a similar structure as in fig. 4. The embodiments of the present application are not limited to the type of communication device 400.
In connection with the schematic structural diagram of the communication apparatus 400 shown in fig. 4, taking the communication apparatus 400 as an example of the terminal device in fig. 3, fig. 5 is an exemplary specific structural form of the terminal device according to the embodiment of the present application.
Wherein in some embodiments the functionality of processor 401 of fig. 4 may be implemented by processor 510 of fig. 5.
In some embodiments, the functionality of the communication interface 404 in fig. 4 may be implemented by the antenna 1, the antenna 2, the mobile communication module 550, the wireless communication module 560, etc. in fig. 5.
Wherein the antennas 1 and 2 are used for transmitting and receiving electromagnetic wave signals. Each antenna in the terminal device may be used to cover a single or multiple communication bands. Different antennas may also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed into a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.
The mobile communication module 550 may provide a solution including 2G/3G/4G/5G wireless communication applied on a terminal device. The mobile communication module 550 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA), etc. The mobile communication module 550 may receive electromagnetic waves from the antenna 1, perform processes such as filtering, amplifying, and the like on the received electromagnetic waves, and transmit the processed electromagnetic waves to the modem processor for demodulation. The mobile communication module 550 can amplify the signal modulated by the modem processor, and convert the signal into electromagnetic waves through the antenna 1 to radiate. In some embodiments, at least some of the functional modules of the mobile communication module 550 may be disposed in the processor 510. In some embodiments, at least some of the functional modules of the mobile communication module 750 may be disposed in the same device as at least some of the modules of the processor 510.
The wireless communication module 560 may be one or more devices integrating at least one communication processing module. The wireless communication module 560 receives electromagnetic waves via the antenna 2, modulates the electromagnetic wave signals, filters the electromagnetic wave signals, and transmits the processed signals to the processor 510. The wireless communication module 560 may also receive a signal to be transmitted from the processor 510, frequency modulate it, amplify it, and convert it to electromagnetic waves for radiation via the antenna 2.
In some embodiments, the antenna 1 of the terminal device is coupled to the mobile communication module 550 and the antenna 2 is coupled to the wireless communication module 560 so that the terminal device can communicate with the network and other devices through wireless communication technology.
In some embodiments, the functionality of memory 403 in FIG. 4 may be implemented by internal memory 521 in FIG. 5, or an external memory (e.g., micro SD card) to which external memory interface 520 is connected, or the like.
In some embodiments, the functionality of the output device 405 of FIG. 4 may be implemented by the display screen 594 of FIG. 5. The display screen 594 includes a display panel.
In some embodiments, the functionality of the input device 406 in FIG. 4 may be implemented by a mouse, a keyboard, a touch screen device, or the sensor module 580 in FIG. 5. In some embodiments, as shown in fig. 5, the terminal device may further include one or more of an audio module 570, a camera 593, an indicator 592, a motor 591, keys 590, a SIM card interface 595, a USB interface 530, a charge management module 540, a power management module 541, and a battery 542, which embodiments of the present application are not particularly limited.
It will be appreciated that the structure shown in fig. 5 does not constitute a specific limitation on the terminal device. For example, in other embodiments of the present application, a terminal device may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
Alternatively, in connection with the schematic structural diagram of the communication apparatus 400 shown in fig. 4, taking the communication apparatus 400 as the network device in fig. 3, the network device is exemplified as the base station, and fig. 6 is an exemplary structural form of the base station 60 provided in the embodiment of the present application.
Wherein the base station 60 includes one or more radio frequency units (e.g., RRUs 601) and one or more BBUs 602.
RRU601 may be referred to as a transceiver unit, transceiver circuitry, or transceiver, etc., that may include at least one antenna feed system (i.e., antenna) 611 and a radio frequency unit 612. The RRU601 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals and baseband signals. In some embodiments, the functionality of the communication interface 404 in fig. 4 may be implemented by the RRU601 in fig. 6.
The BBU602 is a control center of a network device, and may also be referred to as a processing unit, and is mainly configured to perform baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on.
In some embodiments, the BBU602 may be formed by one or more single boards, where the multiple single boards may support a single access indicated radio access network (e.g., an LTE network), or may support different access schemes of radio access networks (e.g., an LTE network, a 5G network, or other networks). The BBU602 also includes a memory 621 and a processor 622, the memory 621 being configured to store necessary instructions and data. The processor 622 is configured to control the network device to perform the necessary actions. The memory 621 and processor 622 may serve one or more boards. That is, the memory and the processor may be separately provided on each board. It is also possible that multiple boards share the same memory and processor. In addition, each single board can be provided with necessary circuits. Wherein in some embodiments, the functions of processor 401 in fig. 4 may be implemented by processor 622 in fig. 6, and the functions of memory 403 in fig. 4 may be implemented by memory 621 in fig. 6.
Alternatively, the RRU601 and the BBU602 in fig. 6 may be physically disposed together or may be physically disposed separately, for example, a distributed base station, which is not specifically limited in the embodiment of the present application.
Optionally, the network device in the embodiments of the present application may support one or more of the following: spatial multiplexing, SU-MIMO, coding, rate matching, scrambling, modulation, layer mapping, precoding, resource mapping, IFFT, DBF, or ABF.
Optionally, the terminal device in the embodiments of the present application may support one or more of the following: decoding, rate dematching, descrambling, demodulation, or channel estimation/equalization.
The communication method provided in the embodiment of the present application will be described in detail with reference to fig. 7.
It should be understood that the names of signals between the devices or the names of parameters in the signals in the embodiments described below are only an example, and other names may be used in the specific implementation, which is not specifically limited in the embodiments of the present application.
Taking interaction between the terminal device and the network device shown in fig. 3 as an example, as shown in fig. 7, a communication method provided in an embodiment of the present application includes the following steps:
S701, the terminal equipment generates first indication information. The first indication information is used for indicating the joint matrix selected by the terminal equipment. The joint matrix includes a frequency domain matrix and a time-varying domain matrix. The first indication information includes indication information of basis vectors other than the first frequency domain basis vector in the frequency domain matrix, and indication information of basis vectors other than the first time-varying domain basis vector in the time-varying domain matrix.
S702, the terminal equipment sends first indication information to the network equipment. Accordingly, the network device receives the first indication information from the terminal device. The terminal device can send the first indication information to the network device through the PUCCH/PUSCH.
The following describes the above step S701 in detail.
Alternatively, in the embodiment of the present application, the terminal device may use a codebook structure shown in formula (1). The airspace matrix W related to the above formula (1) is described below 1 Frequency domain matrix W f Time-varying domain matrix W d Weighting coefficient matrix W associated with target matrix 2 。
Alternatively, in the embodiment of the present application, the airspace matrix W 1 May be that the terminal equipment is in N 1 And selecting a matrix obtained by L space base vectors from the space base vectors. Wherein N is 1 The spatial basis vectors may be N as described above 1 A set of spatial basis vectors of dimensions.
Alternatively, in the embodiment of the present application, the frequency domain matrix W f May be that the terminal equipment is in N 3 Selecting M from the frequency domain basis vectors v A matrix obtained from the time-varying domain basis vectors. Wherein N is 3 The frequency domain basis vectors may be N as described above 3 A set of frequency domain basis vectors for the dimension.
Optionally, in an embodiment of the present application, the time-varying domain matrix W d May be that the terminal equipment is in N 4 Selecting M from among the individual time-varying domain basis vectors p A matrix obtained from the time-varying domain basis vectors. Wherein N is 4 The individual time-varying domain basis vectors may be N as described above 4 A set of time-varying domain basis vectors for a dimension.
Alternatively, in the embodiment of the present application, the frequency domain matrix W f Number M of basis vectors in the medium frequency domain v May be preconfigured or received by the terminal device.
Optionally, in an embodiment of the present application, the time-varying domain matrix W d Number M of medium time-varying domain basis vectors p May be preconfigured or received by the terminal device.
For example, the network device may send the first configuration information to the terminal device. Accordingly, the terminal device receives the first configuration information from the network device. Wherein the first configuration information comprises a frequency domain matrix W f Number M of basis vectors in the medium frequency domain v And/or a time-varying domain matrix W d Number M of medium time-varying domain basis vectors p . That is, the frequency domain matrix W f Number M of basis vectors in the medium frequency domain v Can be indicated by the network device, time-varying domain matrix W d Number M of medium time-varying domain basis vectors p May be indicated by the network device.
Optionally, in an embodiment of the present application, the first indication information further includesFrequency domain matrix W f Number M of basis vectors in the medium frequency domain v And/or a time-varying domain matrix W d Number M of medium time-varying domain basis vectors p . That is, M v And/or M p Can be determined by the terminal equipment and reported to the network equipment.
It can be appreciated that in the embodiment of the present application, the airspace matrix W 1 The number L of the space-domain base vectors may be preconfigured or received by the terminal device. Wherein the first configuration information may include a spatial matrix W 1 The number L of the medium space domain base vectors; alternatively, the first indication information may further include a spatial matrix W 1 The number of the space-domain basis vectors L.
In combination with the hollow domain matrix W of formula (1) described above 1 Dimension, frequency domain matrix W of (2) f Time-varying domain matrix W d Can obtain the weighting coefficient matrix W of the target matrix association 2 Is L x M v M p . Wherein the weighting coefficient matrix W 2 The delay dimension, time-varying dimension (or doppler dimension), and angle dimension (or beam dimension) may be characterized, respectively.
It should be understood that in the embodiment of the present application, the weighting coefficient matrix W associated with the target matrix 2 The non-zero element positions in (a) may be used to indicate corresponding channel information in different dimensions. For example, a weighting coefficient matrix W associated with the target matrix 2 The non-zero element positions in (a) may indicate time-varying information and angle information corresponding to different delays, or may indicate time-varying information and delay information corresponding to different angles, or may indicate angle information and delay information corresponding to different doppler shifts.
Exemplary, as shown in FIG. 8, a weighting coefficient matrix W for target matrix association according to an embodiment of the present application 2 . Where l=4, the weighting coefficient matrix W of the target matrix association 2 The number of lines of 4,4 row vectors may correspond to 4 base vectors, and the 4 base vectors are base vector #1, base vector #2, base vector #3, and base vector #4, respectively. That is, the weighting coefficients of the target matrix associationsMatrix W 2 May correspond to an angle information. M is M v =3, i.e. weighting coefficient matrix W of target matrix association 2 The method comprises 3 sub-weighting coefficient matrixes corresponding to frequency domain base vectors, wherein the 3 frequency domain base vectors are frequency domain base vector #1, frequency domain base vector #2 and frequency domain base vector #3 respectively, and the dimension of the sub-weighting coefficient matrix corresponding to each frequency domain base vector is L multiplied by M p . That is, the weighting coefficient matrix W of the target matrix association 2 One dimension of L x M p May correspond to one delay information. M is M p =4, i.e. the number of column vectors of the sub-weighting coefficient matrix corresponding to one frequency domain base vector is 4, and 4 column vectors may correspond to 4 time-varying domain base vectors. That is, the dimension is L×M p A column vector in a sub-matrix of (a) may correspond to a time-varying information.
Referring to fig. 8, taking a sub-weighting coefficient matrix corresponding to the frequency domain base vector #3 as an example, a weighting coefficient matrix W associated by a target matrix 2 The non-zero element positions in (a) may indicate that, under the frequency domain base vector #1, the time-varying domain base vector selected by the terminal device is the time-varying domain base vector #2, the time-varying domain base vector #3, and the time-varying domain base vector #4, and the spatial base vector selected by the terminal device is the spatial base vector #2 and the spatial base vector #4.
It will be appreciated that the weighting coefficient matrix W associated with the target matrix in fig. 8 2 But also to the form shown in fig. 9. Wherein, as shown in FIG. 9, M p =4, i.e. weighting coefficient matrix W of target matrix association 2 The method comprises the steps of including a sub-weighting coefficient matrix corresponding to 4 time-varying domain base vectors, wherein the dimension of the sub-weighting coefficient matrix corresponding to each time-varying domain base vector is L multiplied by M v . That is, the weighting coefficient matrix W of the target matrix association 2 One dimension of L x M v May correspond to a time-varying information. The number of column vectors of the sub-weighting coefficient matrix corresponding to one time-varying domain base vector is 3, and 3 column vectors can correspond to 3 frequency-domain base vectors.
It will be appreciated that the weighting coefficient matrix associated with the target matrix in fig. 8 or 9 may also be converted into L spatial basis vectorsA weighting coefficient matrix, the dimension of the sub weighting coefficient matrix being M v ×M p 。
Optionally, in the embodiment of the present application, the terminal device may obtain one or more time instants and precoding matrices corresponding to the one or more frequency domain units by measuring the reference signal. The precoding matrix corresponding to the one or more time instants and the one or more frequency domain units may be obtained by the terminal device measuring a plurality of reference signals. The precoding matrix may be obtained by measuring reference signals at any one time among the reference signals measured by the terminal device for multiple times. That is, the terminal device may perform measurement after receiving the reference signal multiple times, and the terminal device may perform measurement once each time the terminal device receives the reference signal, which is not limited in detail in the embodiment of the present application.
The precoding matrix corresponding to the plurality of time instances and the plurality of frequency domain units can be represented by equation (2). The formula (2) is as follows:
wherein W (l) is a precoding matrix corresponding to the first transmission layer, W 1 Is a space domain matrix, W 2 (l) For the weighting coefficient matrix corresponding to the first transmission layer, W f (l) For the frequency domain matrix corresponding to the first transmission layer, W d (l) Is the time-varying domain matrix corresponding to the first transmission layer.) The joint matrix corresponding to the first transport layer may be represented.
Since the operation of generating the first instruction information when l is a different value is the same as that when l=1, l may be omitted when l=1, and thus for simplicity of explanation later, l=1 will be exemplified below. It should be understood that the embodiment of the present application does not limit the number of transmission layers and the number of polarization directions corresponding to the transmission layers. The transmission layer illustrated in the embodiments of the present application may be any one of one or more transmission layers, and the corresponding one polarization direction of the transmission layer may be any one of one or more polarization directions.
See formula (2), t 0 Time f 0 Precoding matrix corresponding to each frequency domain unitCan be determined by formula (3). The formula (3) is as follows:
wherein,is of dimension N 1 ×N 3 N 4 ，W 2 Is L x M v M p ，/>Representing a frequency domain matrix W f F of (f) 0 The number of rows of the device is,representing a time-varying domain matrix W d T of (2) 0 And (3) row. Wherein due to N 1 、N 3 、N 4 、L、M v And M p The foregoing details have been set forth herein, and are not described in detail herein.
Above-mentionedCan be represented by formula (4). The formula (4) is as follows:
wherein k is 1 Represents N 3 Frequency domain basis vector set of dimensions kth 1 Column frequency domain basis vector, k 1 And the kth 1 The delay information represented by the column frequency domain basis vector corresponds. The frequency domain matrix includes a frequency domain base directionKth in the quantity set 1 Column frequency domain basis vectors to the firstColumn frequency domain basis vectors. For convenience of description, the kth in the frequency domain matrix is described below 1 Column frequency domain basis vector ≡>When the base vectors in the column frequency domain, k is used 1 Frequency domain basis vector->The frequency domain basis vector replaces the expression.
Above-mentionedCan be represented by formula (5). The formula (5) is as follows:
wherein,represents N 4 The +.>Column time-varying domain basis vector, ">Can be connected with the firstThe Doppler information represented by the column time-varying domain basis vectors corresponds. The time-varying domain matrix comprises +.>Column time-varying domain basis vectors ≡>Column time-varying domain basis vectors. For convenience of description, the following describes the +.>Column time-varying domain basis vectors ≡>In the case of column time-varying domain basis vectors, & lt, & gt is used >Time-variant domain basis vector->The time-varying domain basis vector replaces the expression.
Of the formula (3)Multiplying by a constant +.>And +.about.in formula (3)>Multiplying by a constantFormula (6) can be obtained, formula (6) being as follows:
wherein,the transformation may be considered as shifting (which may also be referred to as phase rotation) the frequency domain basis vectors within the frequency domain matrix. By shifting the above vectors The second element of (2) becomes +.>I.e. the delay information corresponding to the second element becomes zero after being shifted. Similarly, a->The transformation may be considered as shifting the time-varying domain basis vectors within the time-varying domain matrix. By shifting the above vector->The second element of (2) becomes +.>I.e. the doppler information corresponding to the second element becomes zero after shifting. Since the delay information is zero, the frequency domain base vector corresponding to the element indicating zero delay information is not needed, and the frequency domain base vector corresponding to the element indicating zero delay information can be passed through the remaining M v -1 frequency domain basis vector determination. That is, through M v -1 indication information of the frequency domain basis vectors may indicate M selected by the terminal device v The frequency domain basis vectors, i.e., the frequency domain matrix selected by the terminal device. Similarly, the time-varying domain base vector corresponding to the element indicating zero time-varying information may be omitted and passed through the remaining M p -1 indication information of the time-varying domain basis vector may indicate M selected by the terminal device p And each time-varying domain base vector, namely a time-varying domain matrix selected by the terminal equipment. In summary, the indication information of the basis vectors except the first frequency domain basis vector in the frequency domain matrix and the indication information of the basis vectors except the first time-varying domain basis vector in the time-varying domain matrix can indicate the joint matrix selected by the terminal device, so as to reduceThe overhead of the joint matrix selected by the terminal device is indicated little.
Exemplary, the first frequency domain basis vector and the first time-varying domain basis vector simultaneously correspond to the weighting coefficient matrix W associated with the joint matrix 2 For example, the element with the largest medium amplitude is combined with the weighting coefficient matrix W associated with the joint matrix in FIG. 10 2 And equation (6) describing the joint shift procedure of the frequency domain base vector and the time-varying domain base vector. As shown in FIG. 10, M v ＝3、M p =4, l=4, w 2 Is of dimension LM v M p Filled squares are used to represent the elements with the greatest magnitudes. Wherein, the weighting coefficient matrix W of the joint matrix association shown in (a) of FIG. 10 2 Is the weighting coefficient matrix in the case of no shift. The element with the largest amplitude in the weighting coefficient matrix can be represented by filled square, and the element with the largest amplitude is positioned in k 2 Under the frequency domain basis vectorAt the time-varying domain basis vector. Multiplying +.>The time-variant domain basis vector can be shifted such that +.>The time-varying domain base vector is shifted toward a time-varying domain base vector where the time-varying information is zero. As shown in fig. 10 (b), after the amplitude maximum element is shifted by the time-varying domain basis vector, the amplitude maximum element is located at k 2 The sub-weighting coefficient matrix corresponding to the frequency domain base vector>At the time-varying domain basis vector. Multiplying +.>The frequency domain basis vectors may be shifted such that k 2 The frequency domain base vector is shifted toward a frequency domain base vector with zero delay information. As shown in fig. 10 (c), the amplitude valueAfter the maximum element is shifted by the frequency domain basis vector, the maximum element of the amplitude is positioned at k 1 The sub-weighting coefficient matrix corresponding to the frequency domain base vector>At the time-varying domain basis vector. That is, after the frequency domain base vector and the time-varying domain base vector are jointly shifted, the position of the amplitude maximum element is shifted to the position where the time-varying information and the delay information are zero.
It should be understood that the above-mentioned joint shift process of the frequency domain base vector and the time-varying domain base vector shown in fig. 10 may also be that the time-varying domain base vector shift is performed first, and then the frequency domain base vector shift is performed; alternatively, the frequency domain base vector and the time-varying domain base vector are shifted simultaneously, which is not particularly limited in the embodiments of the present application.
Further, the formula (6) may be modified into the formula (7) according to the nature of the kronecker product. The formula (7) is as follows:
the above equation (7) differs from equation (3) by only a constant amountSince the precoding matrix is multiplied by a constant, the terminal equipment is not affected to send PMI, i.e. the capacity of the system is not affected. That is, by shifting the frequency domain matrix and the time-varying domain matrix, respectively, the setting of PMI is not affected.
It should be understood that at N 3 In the case of < 19, the terminal device is selected from N 3 Selecting M from the frequency domain basis vectors v The frequency domain basis vectors may be composed ofCandidate frequency domain basis vector combinations, i.e. the terminal device can be derived from +.>Candidate frequency domain basis vectorsAnd selecting one candidate frequency domain base vector combination from the combinations as a frequency domain matrix. Wherein (1)>The candidate frequency domain basis vector combinations may correspond +.>And index numbers. That is, in the case of indicating the frequency domain matrix by means of the index number, the indication bit (bit) overhead of the frequency domain matrix is Log 2 />And a number of bits. Similarly, the terminal device is from N 4 Selecting M from among the individual time-varying domain basis vectors p The individual time-variant domain basis vectors may constitute +.>And combining the candidate frequency domain basis vectors.
It should be understood that in the embodiment of the present application, in N 3 In the case of a value of > 19,the corresponding excessive value can cause the increase of the indication cost, and in order to reduce the indication cost, a frequency domain base matrix can be indicated by adopting a two-step indication mode. Wherein, the terminal equipment can be from N 3 An index M for constructing a set of intermediate candidate frequency domain basis vectors in the candidate frequency domain basis vectors initial ，M initial Is 2M in size v I.e. the terminal device can be from +.>And selecting one candidate frequency domain base vector combination from the candidate frequency domain base vector combinations as a frequency domain matrix. />
Alternatively, M initial May be indicated to the network device by the terminal device. Wherein M is initial ∈{-2M υ +1,-2M υ +2,…,0}。
That is, without joint shifting of the frequency domain base vector and the time-varying domain base vector, the bit overhead C required for the terminal device to indicate the joint matrix can be determined by the formulas (8) and (9).
Optionally, in an embodiment of the present application, a basis vector other than the first time-varying domain basis vector in the time-varying domain matrix is M p M in individual time-varying domain basis vectors p -1 time-varying domain basis vector. M is M p -1 time-varying domain basis vector is a candidate time-varying domain basis vector combination in a first candidate set comprisingCandidate time-varying domain basis vector combinations. The basis vectors of the frequency domain matrix except the first frequency domain basis vector are M v M in the frequency domain basis vectors v -1 frequency domain basis vector. M is M v -1 frequency domain basis vector is a combination of candidate frequency domain basis vectors in a second candidate set comprising +.>And combining the candidate frequency domain basis vectors. That is, in case of joint shifting of the frequency domain base vector and the time-varying domain base vector, the terminal device may pass through M p -1 time-variant domain basis vector and M v The 1 frequency domain basis vector indicates the joint matrix, the bit overhead C required by the terminal device to indicate the joint matrix can be reduced.
Illustratively, in the case of performing joint shift of the frequency domain base vector and the time-varying domain base vector, bit overhead C required for the terminal device to indicate the joint matrix can be determined by equation (10) and equation (11). The formulas (10) and (11) are as follows:
exemplary, in the embodiment of the present application, the first indication information may include a parameter i 1,5 、i 1,6,l And i 1,9,l . Wherein i is 1,5 May be used to indicate the intermediate candidate set of frequency-domain basis vectors M initial 。i 1,6,l For indicating the frequency domain matrix. i.e 1,9,l For indicating the time-varying domain matrix. l represents the number of layers.
Exemplary, i 1,5 May be an intermediate candidate frequency domain basis vector set M initial Is a reference number to (a). For example i 1,5 ∈{0,1,…,2M υ -1}, or i 1,5 ∈{1,2,…,2M υ Or i 1,5 ∈{-2M υ ,-2M v +1, …, -1} the examples of the present application do not specifically limit the start of the index number.
Exemplary, i 1,6,l The index number, which may be a frequency domain matrix, may be represented by equation (12). Formula (12) is as follows:
exemplary, i 1,9,l May be index numbers corresponding to the time-varying domain matrix, e.g
It should be understood that in equation (7), by multiplying different constants, any one of the frequency domain base vectors in the frequency domain matrix may be the frequency domain base vector corresponding to the element whose delay information is zero. Specifically, referring to formula (6), one can apply K in (a) 2 Replaced by->Therefore, the element with zero delay information can correspond to any frequency domain base vector in the frequency domain matrix. Similarly, any one of the time-varying domain base vectors in the time-varying domain matrix may be the time-varying domain base vector corresponding to the element whose delay information is zero. That is, in the embodiment of the present application, the first frequency domain base vector may be any one of frequency domain base vectors in a frequency domain matrix, and the first time-varying domain base vector may be any one of time-varying domain base vectors in a time-varying domain matrix.
Optionally, in the embodiment of the present application, the first frequency domain base vector is a frequency domain base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the joint matrix, and the first time-varying domain base vector is a time-varying domain base vector corresponding to an element with the largest amplitude in the weighting coefficient matrix. That is, the first time-varying domain basis vector and the first frequency-domain basis variable may simultaneously correspond to the weighting coefficient matrix W associated with the joint matrix 2 The element with the largest amplitude value is further in one or more time-varying domain base vectors corresponding to the first frequency domain base vector, so that the first time-varying domain base vector is an essential time-varying domain base vector. Of course, in the one or more frequency domain base vectors corresponding to the first time-varying frequency domain base vector, the first frequency domain base vector may also be made to be an optional frequency domain base vector.
In this embodiment of the present application, the joint matrix including the frequency domain matrix and the time-varying domain matrix may be indicated by the indication information of the basis vectors other than the first frequency domain basis vector in the frequency domain matrix and the indication information of the basis vectors other than the first frequency domain basis vector in the time-varying domain matrix, that is, all the frequency domain basis vectors in the frequency domain matrix and all the time-varying domain basis vectors in the time-varying domain matrix may not be indicated, so the indication overhead may be reduced, and the delay information of the channel may be indicated by the frequency domain matrix in the joint matrix, and the time-varying information of the channel may be indicated by the time-varying domain matrix in the joint matrix. In summary, according to the communication method provided by the embodiment of the application, the delay information and the time-varying information of the channel can be indicated through smaller indication overhead.
It will be appreciated that, referring to fig. 8, since different delays correspond to different channel paths, which contain different doppler shifts, the weighting coefficient matrix W associated with the target matrix for different delays (frequency domain basis vectors) 2 The Doppler shift (time-varying domain basis vector) corresponding to the non-zero element in (b) is different, and the weighting coefficient matrix W associated with the target matrix 2 The number of elements is LM v M P And due to the weighting coefficient matrix W associated with the target matrix 2 The non-zero elements in the W-type crystal have no definite distribution characteristics, and the non-zero elements can be distributed in the W 2 All LM of (B) v M P At each position, further need to be matched with LM v M P Indicating each position of (c) so that W 2 The indication overhead of non-zero elements in the medium is LM v M P And a number of bits.
Optionally, in the embodiment of the present application, the first indication information is further used to indicate a target base vector combination corresponding to each base vector in the first matrix. Wherein the target basis vector combination comprises one or more basis vectors selected by the terminal device in the target matrix. The first matrix is a matrix in a candidate matrix set, the target matrix comprises one or more matrices except the first matrix in the candidate matrix set, and the candidate matrix set comprises a frequency domain matrix, a time-varying domain matrix and a space domain matrix selected by the terminal equipment. Illustratively, the first matrix may be a frequency domain matrix and the target matrix may be a time-varying domain matrix. That is, the terminal device may select different time-varying domain base vectors from the time-varying domain matrix according to the different frequency-varying domain base vectors, and indicate the selected time-varying domain base vectors to the network device, thereby reducing the weighting coefficient matrix W associated with the target matrix 2 To reduce W 2 Indicating overhead for non-zero elements in the list.
Illustratively, taking the frequency domain basis vector #3 in fig. 11 as an example, the manner in which the terminal device instructs the target basis vector combination and the principle of narrowing the weighting coefficient matrix associated with the target matrix are explained. Wherein the matrix in (a) in FIG. 11 is the destination of the unselected target base vector setThe weighting coefficient matrix associated with the target matrix. The weighting coefficient matrix is a matrix of dimensions 4×12. The frequency domain matrix corresponding to the weighting coefficient matrix comprises frequency domain base vectors #1 to #3, the time-varying domain matrix corresponding to the weighting coefficient matrix comprises time-varying domain base vectors #1 to #4, and the spatial domain matrix corresponding to the weighting coefficient matrix comprises spatial domain base vectors #1 to #4. The sub-weighting coefficient matrix corresponding to the frequency domain base vector #3 is a matrix with a dimension of 4×3, and the sub-weighting coefficient matrix contains three non-zero elements, which are respectively located at the time-varying domain base vector #2, the time-varying domain base vector #3 and the time-varying domain base vector #4. In fig. 11 (b), the terminal device may select, within the time-varying domain matrix, the time-varying domain base vector #2, the time-varying domain base vector #3, and the time-varying domain base vector #4 as the target base vector combinations corresponding to the frequency-domain base vector #3, and further, the matrix formed by the elements of the filling pattern within the sub-weighting coefficient matrix corresponding to the frequency-domain base vector #3 is a schematic diagram of the weighting coefficient matrix associated with the target base vector combinations corresponding to the frequency-domain base vector # 3. In fig. 11 (b), the matrix of 4×3 dimensions of the filling pattern is cut out by a column of elements of the time-varying domain base vector #1, which corresponds to the weighting coefficient matrix W associated with the target matrix, as compared with the sub-weighting coefficient matrix corresponding to the frequency-domain base vector #3 of 4×4 dimensions in fig. 11 (a) 2 The positions of the zero elements are cut out so that the weighting coefficient matrix W associated with the target matrix 2 To reduce W 2 Indicating overhead for non-zero elements in the list.
Illustratively, in the embodiments of the present application, the first matrix may be one or more of the following: the method comprises the steps of selecting a frequency domain matrix by a terminal device, selecting a time-varying domain matrix by the terminal device, selecting a space domain matrix by the terminal device, selecting a frequency domain matrix and a time-varying domain matrix by the terminal device, selecting a frequency domain matrix and a space domain matrix by the terminal device, and selecting a time-varying domain matrix and a space domain matrix by the terminal device.
Illustratively, in the case where the first matrix is a frequency domain matrix selected by the terminal device, the target matrix comprises a time-varying domain matrix and/or a spatial domain matrix selected by the terminal device.
In the case where the first matrix is a time-varying domain matrix selected by the terminal, the target matrix comprises a frequency domain matrix and/or a spatial domain matrix selected by the terminal device,
illustratively, in the case that the first matrix is a spatial matrix selected by the terminal device, the target matrix includes a frequency domain matrix and/or a time-varying domain matrix selected by the terminal device.
Illustratively, in the case where the first matrix is a frequency domain matrix and a time-varying domain matrix selected by the terminal device, the target matrix comprises a spatial domain matrix selected by the terminal device.
Illustratively, in the case where the first matrix is a frequency domain matrix and a spatial domain matrix selected by the terminal device, the target matrix includes a time-varying domain matrix selected by the terminal device.
That is, in the embodiment of the present application, the terminal device may select different combinations of target base vectors according to three different base vectors (i.e. frequency domain base vector, time-varying domain base vector, and space domain base vector), so as to reduce the weighting coefficient matrix W associated with the target matrix 2 Is a dimension of (c).
Optionally, in the embodiment of the present application, the first indication information includes indication information of a target base vector combination corresponding to the first base vector. The indication information of the target base vector combination corresponding to the first base vector comprises indication information of base vectors except the reference base vector in the target base vector combination corresponding to the first base vector. The first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix. The reference basis vectors are one or more basis vectors in the target matrix corresponding to the element with the largest amplitude in the weighting coefficient matrix. That is, since the basis vector corresponding to the element with the largest amplitude is the necessary basis vector, when the basis vector is selected in the target matrix, the number of candidate target basis vector combinations corresponding to the first basis vector can be reduced, thereby reducing the indication overhead of the target basis vector combination corresponding to the first basis vector.
Exemplary, the first frequency domain basis vector and the first time-varying domain basis vector simultaneously correspond to the weighting coefficient matrix W associated with the target matrix 2 The element with the largest amplitude value and the target base corresponding to the first frequency domain base vectorThe number of base vectors in the vector combination is n k For example, the first base vector may be a first frequency domain base vector, the target matrix may be a time-varying domain matrix, the reference base vector may be a first time-varying domain base vector, and the target base vectors are combined into a target matrix (M P Individual time-varying domain basis vectors) to select n k The time-varying domain base vectors, since the reference base vector is the mandatory vector, the target base vector combination isOne of the candidate target basis vector combinations, not + ->One of the candidate target basis vector combinations. That is, the number of candidate target base vector combinations corresponding to the first base vector may be reduced, thereby reducing the indication overhead of the target base vector combinations corresponding to the first base vector.
Optionally, in an embodiment of the present application, the target matrix includes a first target matrix and/or a second target matrix. Wherein the first target matrix is different from the second target matrix.
For example, in the case that the first matrix is a frequency domain matrix selected by the terminal device, the first target matrix may be a time-varying domain matrix selected by the terminal device, and the second target matrix may be a spatial domain matrix selected by the terminal device. Or, in the case that the first matrix is a frequency domain matrix selected by the terminal device, the first target matrix may be a spatial domain matrix selected by the terminal device, and the second target matrix may be a time-varying domain matrix selected by the terminal device;
For example, in the case that the first matrix is a time-varying domain matrix selected by the terminal device, the first target matrix may be a frequency domain matrix selected by the terminal device, and the second target matrix may be a spatial domain matrix selected by the terminal device. Alternatively, in the case that the first matrix is a time-varying domain matrix selected by the terminal device, the first target matrix may be a spatial domain matrix selected by the terminal device, and the second target matrix may be a frequency domain matrix selected by the terminal device.
For example, in the case that the first matrix is a spatial matrix selected by the terminal device, the first target matrix may be a frequency domain matrix selected by the terminal device, and the second target matrix may be a time-varying domain matrix selected by the terminal device. Alternatively, in the case that the first matrix is an airspace matrix selected by the terminal device, the first target matrix may be a time-varying domain matrix selected by the terminal device, and the second target matrix may be a frequency domain matrix selected by the terminal device.
Optionally, the target base vector combination comprises a first target base vector combination and/or a second target base vector combination. Wherein the first target base vector combination comprises one or more base vectors selected by the terminal device in the first target matrix, and the second target base vector combination comprises one or more base vectors selected by the terminal device in the second target matrix.
That is, in the embodiment of the present application, the terminal device may select a time-varying domain base vector and/or a spatial base vector according to the frequency domain base vector; or, the terminal device may select a frequency domain base vector and/or a space domain base vector according to the time-varying domain base vector; alternatively, the terminal device may select the frequency domain base vector and/or the time-varying domain base vector based on the spatial base vector.
It will be appreciated that the dimensions of the weighting factor matrix associated with the target matrix may be further reduced when the target base vector combination comprises a first target base vector combination and a second target base vector combination.
Illustratively, taking the frequency domain basis vector #3 in fig. 11 as an example, the principle of further reducing the dimension of the weighting coefficient matrix associated with the target matrix is explained. The first matrix is a frequency domain matrix, the first target matrix is a time-varying domain matrix, and the second target matrix is a space domain matrix. In fig. 11 (b), a matrix with a dimension of 4×3 of the filling pattern is a weighting coefficient matrix associated with the first target base vector combination corresponding to the frequency domain base vector # 3. In fig. 11 (c), the matrix formed by the elements of the filling pattern is a frequency domain base vector after the terminal device selects the time-varying domain base vector #2, the time-varying domain base vector #3, and the time-varying domain base vector #4, and the space domain base vector #2 and the space domain base vector #4 are selected Schematic diagram of weighting coefficient matrix associated with target base vector combination corresponding to # 3. In fig. 11 (c), 4 elements of the filling pattern constitute a 2×2-dimensional matrix, which is a weighting coefficient matrix associated with the target base vector combination corresponding to the frequency domain base vector #3, and two rows of elements of the space base vector #1 and the space base vector #3 are clipped compared with the 4×3-dimensional matrix of the filling pattern in fig. 11 (b), which corresponds to the positions of clipping zero elements in the 4×3-dimensional matrix, so that the weighting coefficient matrix W associated with the target matrix 2 Further reduction of the dimension of (2) and thus the W can be reduced 2 Indicating overhead for non-zero elements in the list.
Optionally, in the embodiment of the present application, the first indication information is further used to indicate a position of a non-zero element in the first weighting coefficient matrix. The first weighting coefficient matrix is a weighting coefficient matrix associated with a target base vector combination corresponding to each base vector in the first matrix; or the first weighting coefficient matrix is a weighting coefficient matrix associated with the target base vector combination corresponding to all the base vectors in the first matrix. Illustratively, taking the first matrix as a frequency domain matrix and the target matrix as a time-varying domain matrix as an example, the description is given with reference to fig. 11. In fig. 11 (b), the weighting coefficient matrix associated with the target base vector combination corresponding to each base vector in the first matrix includes:
The weighting coefficient matrix associated with the target base vector combination corresponding to the frequency domain base vector #1 may be a matrix with 4×3 dimensions of the filling pattern in the sub-weighting coefficient matrix corresponding to the frequency domain base vector #1 in (b) of fig. 11;
the weighting coefficient matrix associated with the target base vector combination corresponding to the frequency domain base vector #2 may be a matrix with a dimension of 4×2 of the filling pattern in the sub-weighting coefficient matrix corresponding to the frequency domain base vector #2 in (b) of fig. 11;
the weighting coefficient matrix associated with the target base vector combination corresponding to the frequency domain base vector #3 may be a matrix with a dimension of 4×3 of the filling pattern in the sub-weighting coefficient matrix corresponding to the frequency domain base vector #3 in (b) of fig. 11.
For example, the weighting coefficient matrix associated with the target base vector combinations corresponding to all the base vectors in the first matrix may be a matrix having a dimension of 4×8 formed by elements of all the filling patterns in (b) in fig. 11.
Optionally, in the embodiment of the present application, a sum of dimensions of the weighting coefficient matrix associated with the target base vector combination corresponding to each base vector in the first matrix is smaller than dimensions of the weighting coefficient matrix associated with the target matrix.
It may be appreciated that after the first indication information indicates the target base vector combination corresponding to each base vector in the first matrix, a part of blank zero elements may be clipped on the weighting coefficient matrix associated with the target matrix, so that the sum of dimensions of the weighting coefficient matrix associated with the target base vector combination corresponding to each base vector in the first matrix is smaller than the dimensions of the weighting coefficient matrix associated with the target matrix.
The indication overhead of the terminal equipment indicating the target base vector set corresponding to each base vector in the first matrix is illustrated by dividing the number of the base vectors in the target base vector combination and/or the total number of the base vectors in all the target base vectors into three scenes according to the terminal equipment.
Scene one:
in scenario one, before the terminal device sends the first indication information, the network device may determine the number of basis vectors in the first target basis vector combination and the number of basis vectors in the second target basis vector combination. That is, the network device and the terminal device may determine index information for indicating the first target base vector combination and the second target base vector combination according to the number of base vectors in the first target base vector combination and the number of base vectors in the second target base vector combination, and further indicate the target base vector combination between the network device and the terminal device by means of index numbers. Of course, the terminal device may also indicate the first target base vector combination and the second target base vector combination in a bit map (bitmap) manner.
Optionally, the communication method provided in the embodiment of the present application further includes: the network device sends the second indication information to the terminal device. Accordingly, the terminal device receives the second indication information from the network device. The second indication information is used for indicating the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix and/or the sum of the numbers of base vectors in the target base vector combination corresponding to each base vector in the first matrix.
Optionally, in the embodiment of the present application, the number of base vectors in the first target base vector combination is preconfigured or received by the terminal device, and the number of base vectors in the second target base vector combination is preconfigured or received by the terminal device. That is, the network device may configure index information for the first target base vector combination and/or the second target base vector combination, and the terminal device may instruct the first target base vector combination and/or the second target base vector combination by using feedback index information.
Optionally, in this embodiment of the present application, the number of basis vectors in the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the first basis vector in the first matrix is n k The first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix. The first target base vector combination corresponding to the first base vector is one candidate base vector combination in the third candidate set. The number of candidate base vector combinations in the third candidate set is
Optionally, in this embodiment of the present application, the number of basis vectors of the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix is n i . The first target base vector combination corresponding to the ith base vector is one candidate base vector combination in the fourth candidate set. The number of candidate base vector combinations in the fourth candidate set isA1 is the number of basis vectors in the first matrix.
For example, as one example, the firstA matrix is a frequency domain matrix selected by the terminal equipment, A1 is M v The first basis vector is k in the frequency domain matrix j Frequency domain basis vector, first target matrix is time-varying domain matrix, B1 is M p The number of candidate base vector combinations in the third candidate set isCan be corresponding to->And index numbers. k (k) j The index of the first target vector combination corresponding to the frequency domain basis vector may be determined by +. >And (3) representing. />The range of (2) can be represented by formula (13). The formula (13) is as follows:
wherein the number of candidate base vector combinations in the fourth candidate set isDividing k in a first matrix k The index of the first target vector combination corresponding to the ith frequency domain basis vector except the frequency domain basis vector can be calculated by i 1,10,i,l Representing i.epsilon. {1,2, …, M v And i is not equal to k. i.e 1,10,i,l The range of (2) can be represented by formula (14). Formula (14) is as follows:
that is, the indication overhead of the first target vector combination corresponding to each basis vector in the first matrix is The dimension of the weighting coefficient matrix associated with the target base vector combination corresponding to each base vector in the first matrix is L multiplied by n i Further, the indication overhead of the first weighting coefficient matrix is +.>
Optionally, in this embodiment of the present application, the number of basis vectors in the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the first basis vector in the first matrix isThe first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the second target base vector combination corresponding to the first base vector is one candidate base vector combination in a fifth candidate set, and the number of candidate base vector combinations in the fifth candidate set is +. >
Optionally, in the embodiment of the present application, the number of basis vectors in the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix isThe second target base vector combination corresponding to the ith base vector is one candidate base vector combination in a sixth candidate set, and the number of candidate base vector combinations in the sixth candidate set is +.>A1 is the number of base vectors in the first matrix, and A1 is an integer greater than 1.
The above-mentionedIn an example, the terminal device may also indicate the second target base vector combination at the same time. Wherein the second target matrix is an airspace matrix selected by the terminal equipment, B2 is L, and the number of candidate base vector combinations in the fifth candidate set isk j The index of the second target vector combination corresponding to the frequency domain basis vector may be determined by +.>And (3) representing. />The range of (2) can be represented by formula (15). Formula (15) is as follows:
wherein the number of candidate base vector combinations in the sixth candidate set isDividing k in a first matrix k The index of the second target vector combination corresponding to the ith frequency domain basis vector other than the frequency domain basis vector may be calculated by i 1,11,i,l Representing i.epsilon. {1,2, …, M v And i is not equal to k. i.e 1,11,i,l The range of (2) can be represented by formula (16). Formula (16) is as follows: / >
That is, the indication overhead of the second target vector combination corresponding to each basis vector in the first matrix is The dimension of the weighting coefficient matrix associated with the target base vector combination corresponding to each base vector in the first matrix is +.>The indication overhead of the first weighting coefficient matrix is +.>
Scene II:
scene two differs from scene one in that it is not the number of base vectors in the target base vector set corresponding to each base vector in the first matrix, but the sum of the numbers of base vectors in the target base vector combination corresponding to each base vector in the first matrix, which is received or preconfigured by the terminal device.
Optionally, in this embodiment of the present application, the sum of the numbers of base vectors in the first target base vector combination corresponding to each base vector in the first matrix is preconfigured or received by the terminal device, and the sum of the numbers of base vectors in the second target base vector combination corresponding to each base vector in the first matrix is preconfigured or received by the terminal device.
Optionally, in the embodiment of the present application, the number of base vectors of the first matrix is A1, the number of base vectors of the first target matrix is B1, the sum of the numbers of base vectors of the first target base vector combination corresponding to each base vector in the first matrix is N, and the combination of the N base vectors is one candidate base vector combination in the seventh candidate set. Wherein the number of candidate base vector combinations in the seventh candidate set is
For example, as one example, the first matrix is a frequency domain matrix selected by the terminal device, and A1 is M v The first target matrix is a time-varying domain matrix, and B1 is M p The number of candidate base vector combinations in the seventh candidate set isCan be corresponding to->And index numbers. The index of the combination of the N basis vectors may be determined by i 1,10,l And (3) representing. i.e 1,10,l The range of (2) can be represented by formula (17). Formula (17) is as follows:
that is, the indication overhead of the combination of the N basis vectors isThe dimension of the weighting coefficient matrix associated with the target base vector combination corresponding to each base vector in the first matrix is L multiplied by N, and the indication overhead of the first weighting coefficient matrix is L multiplied by N.
Optionally, in the embodiment of the present application, the number of basis vectors of the first matrix is A1, the number of basis vectors of the second target matrix is B2, and the sum of the numbers of basis vectors of the second target basis vector combination corresponding to each basis vector in the first matrix isThe combination of basis vectors is one candidate basis vector combination in the eighth candidate set. Wherein the number of candidate base vector combinations in the eighth candidate set is->
In the above example, the terminal device may also indicate the second target base vector combination at the same time. Wherein the second target matrix is an airspace matrix selected by the terminal equipment, B2 is L, and the number of candidate base vector combinations in the eighth candidate set is Can be corresponding to->And index numbers. />The index of the combination of the individual basis vectors may be determined by i 1,11,l And (3) representing. i.e 1,11,l The range of (2) can be represented by formula (18). Formula (18) is as follows:
/>
that is to say that the first and second,the combined indication overhead of the individual basis vectors is +.>The dimension of the weighting coefficient matrix associated with the target base vector combination corresponding to each base vector in the first matrix is +.>The indication overhead of the first weighting coefficient matrix is +.>
Scene III:
in the third scenario, the terminal device may determine the number or the sum of the numbers of the base vectors in the target base vector combination by itself, or the network device is unknown to the number or the sum of the numbers of the base vectors in the target base vector combination, so that the terminal device and the network device cannot indicate, by means of an index, the target base vector combination corresponding to each base vector in the first matrix, and the terminal device may indicate, by means of a bit bitmap, the target base vector combination corresponding to each base vector in the first matrix.
Optionally, the target base vector combination corresponding to each base vector in the first matrix is indicated by a bit map in one or more of the following cases:
the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
The terminal equipment does not receive the number of the base vectors in the target base vector combination corresponding to each base vector in the first matrix;
the sum of the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
the terminal equipment does not receive the sum of the numbers of the base vectors in the target base vector combination corresponding to each base vector in the first matrix.
It can be appreciated that, in the case where the terminal device indicates the target base vector combination corresponding to each base vector in the first matrix by using the bit map, the terminal device may not indicate the position of the element with the largest amplitude in the weighting coefficient matrix associated with the target matrix, and the position of the element with the largest amplitude in the weighting coefficient matrix associated with the target matrix may pass through the parameter i 1,8,l An indication. Wherein parameter i 1,8,l The description of the PMI may be referred to in the preamble of the embodiment, and will not be repeated herein.
Optionally, in the embodiment of the present application, the terminal device may use a bit map with a dimension of 1 to indicate a first target base vector combination and/or a second target base vector combination corresponding to each base vector in the first matrix. The terminal equipment is used for indicating a first target base vector combination corresponding to each base vector in a first matrix, wherein the first matrix is a frequency domain matrix selected by the terminal equipment, and the number of the base vectors in the frequency domain matrix is M v The first target matrix is a time-varying domain matrix, and the number of base vectors in the time-varying domain matrix is M p . That is, the terminal device is at M p M v One or more base vectors are selected from the base vectors, and in consideration that the base vector corresponding to the element with the largest indication amplitude is not needed, but indication information indicating whether other positions are selected is needed, the terminal equipment indicates that the indication overhead of the first target base vector combination corresponding to each base vector in the first matrix is M through a bit map p M v -1. In addition, the terminal device may also indicate each of the first matrices through a bit mapA second target base vector combination corresponding to the base vector, wherein for the second target base vector combination corresponding to each base vector in the first matrix, the terminal equipment is in M v One or more basis vectors are selected from the L basis vectors, so that the bit map indicates that the indication overhead of the second target basis vector combination corresponding to each basis vector in the first matrix is M v L-1。
It can be understood that, for the first matrix being a time-varying domain matrix, the first target matrix is a space matrix, the number of basis vectors in the space matrix is L, and the terminal device is M p Selecting one or more base vectors from the L base vectors, indicating an overhead of M p L-1. Similarly, for a first matrix being a spatial matrix, a first target matrix being a frequency domain matrix, the indication overhead is M v L-1。
Alternatively, in the embodiment of the present application, the time when the first indication information is valid may refer to a time predicted by the terminal device through an autoregressive (auto autoregressive, AR) algorithm. The time at which the first indication information is valid may be one or more.
Or, alternatively, the time when the first indication information is valid may refer to the time when the network device may use the precoding matrix corresponding to the first indication information to precode the downlink signal, where the time when the first indication information is valid is greater than the time when the reference signal is measured or the time when the reference signal is received.
By way of example, it is assumed that channel information at a future time can be represented by some linear combination of channel information at the previous 4 times, and thus equations (19) to (22) can be obtained. The formulas (19) to (22) are as follows:
h (5) =a1×h (4) +a2×h (3) +a3×h (2) +a4×h (1) formula (19)
h (6) =a1×h (5) +a2×h (4) +a3×h (3) +a4×h (2) formula (20)
h (7) =a1×h (6) +a2×h (5) +a3×h (4) +a4×h (3) formula (21)
h (8) =a1×h (7) +a2×h (6) +a3×h (5) +a4×h (4) formula (22)
In the formulas (19) to (22), h (1) to h (8) may represent channel information corresponding to the 1 st to 8 th measurement reference signal timings. The linear combination parameters a1, a2, a3, and a4 can be obtained by the formulas (19) to (22). Therefore, the channel information at the future time is expressed as equation (23). Formula (23) is as follows:
In the formula (23), the amino acid sequence of the formula (23),may be represented as the time at which the first indication information is valid.
Optionally, in the embodiment of the present application, a time-varying domain base vector in the time-varying domain matrix is used to indicate a time when the first indication information is valid. The difference between the time when the first indication information is valid and the first measurement time is a positive integer multiple of the measurement interval. The first measurement time is the time of the measurement reference signal closest to the time when the first indication information is valid, and the time when the first indication information is valid is greater than the first measurement time. The measurement interval is the difference between the moments of two adjacent measurement reference signals. That is, the interval between the time when the first indication information is valid and the time when the reference signal is measured last time is an integer multiple of the measurement interval. It will be appreciated that, since the time at which the first indication information is valid may be preconfigured or received by the network device, the time at which the first indication information is valid is generally determined, and thus the time at which the reference signal was last measured by the terminal device may be determined by the interval between the time at which the first indication information is valid and the time at which the reference signal was last measured.
Alternatively, in the embodiment of the present application, the time when the first indication information is valid may correspond to each time-varying domain base vector in the set of time-varying domain base vectors. The number of the effective moments of the first indication information corresponds to the number of the time-varying domain base vectors one by one.
Fig. 12 is a schematic diagram illustrating a relationship between a measurement period and a period in which first indication information is valid. As shown in fig. 12, k represents the start time of measurement, W mes The duration of the measurement is indicated and,i represents the starting time of the first indication information being valid, W csi The number of times when the first indication information is valid, i.e. W is contained in the time period csi First indication information. In one possible implementation, the number of time-varying domain basis vectors in the time-varying domain matrix is equal to W csi The same applies.
Alternatively, in the embodiment of the present application, the time corresponding to the first row element of the time-varying domain matrix may be smaller than I. That is, the time corresponding to the first row element of the time-varying domain matrix may be any time before I, and thus the resolution of the time-varying domain base vector may be increased.
Optionally, in the embodiment of the present application, the first indication information further includes a correspondence between a time-varying domain base vector in the time-varying domain matrix and the first time. The first time is a starting time for indicating that the first indication information is valid. That is, in the case where the time corresponding to the first element of the time-varying domain base vector is not I, the start time at which the first indication information is valid can be determined by the correspondence between the time-varying domain base vector and the first time.
It will be appreciated that the terminal device may determine by itself whether to increase the resolution of the time-varying domain basis vector and report it to the network device.
Alternatively, the correspondence between the time-varying domain basis vector in the time-varying domain matrix and the first time may be preconfigured or received by the terminal device. That is, the network device may decide whether to increase the resolution of the time-varying domain basis vector.
The actions of the terminal device in the steps S701 to S702 may be performed by the processor 401 in the communication apparatus 400 shown in fig. 4 by calling the application code stored in the memory 403 to instruct the network device, and the actions of the network device in the steps S701 to S702 may be performed by the processor 401 in the communication apparatus 400 shown in fig. 4 by calling the application code stored in the memory 403 to instruct the terminal device, which is not limited in any way in the embodiment of the present application.
It will be appreciated that in the various embodiments above, the methods and/or steps implemented by the network device may also be implemented by components (e.g., chips or circuits) that may be used in the network device; the methods and/or steps implemented by the terminal device may also be implemented by components (e.g., chips or circuits) available to the terminal device.
The above description has been presented mainly from the point of interaction between the network elements. Correspondingly, the embodiment of the application also provides a communication device which is used for realizing the various methods. The communication device may be a terminal device in the above method embodiment, or a device including the above terminal device, or a component that may be used for the terminal device; alternatively, the communication device may be a network device in the foregoing method embodiment, or an apparatus including the foregoing network device, or may be a component that may be used in the network device, where, in order to implement the foregoing function, the communication device includes a corresponding hardware structure and/or a software module that performs each function. Those of skill in the art will readily appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. 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.
In the embodiment of the present application, the functional modules of the communication device may be divided according to the above embodiment of the method, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be understood that the division of the modules in the embodiments of the present application is illustrative, and is merely a logic function division, and other division manners may be implemented in practice.
For example, taking a communication device as an example of the terminal device in the above method embodiment, fig. 13 shows a schematic structural diagram of a terminal device 130. The terminal device 130 includes a transceiver module 1301 and a processing module 1302. The transceiver module 1301 may also be referred to as a transceiver unit for implementing a transceiver function, and may be, for example, a transceiver circuit, a transceiver, or a communication interface.
The processing module 1302 is configured to generate first indication information, where the first indication information is used to indicate a joint matrix selected by the terminal device, the joint matrix includes a frequency domain matrix and a time-varying domain matrix, and the first indication information includes indication information of a base vector except for a first frequency domain base vector in the frequency domain matrix and indication information of a base vector except for the first time-varying domain base vector in the time-varying domain matrix; a transceiver module 1301, configured to send the first indication information to a network device.
In some embodiments, the first frequency domain base vector is a frequency domain base vector corresponding to an element with the largest amplitude in the weighting coefficient matrix associated with the joint matrix, and the first time-varying domain base vector is a time-varying domain base vector corresponding to an element with the largest amplitude in the weighting coefficient matrix.
In some embodiments, the time-varying domain matrix is the terminal device at N 4 Selecting M from among the individual time-varying domain basis vectors p A matrix obtained by the base vectors of the time-varying domains, wherein the base vectors except the first time-varying domain base vector in the time-varying domain matrix are M p M in individual time-varying domain basis vectors p -1 time-variant domain basis vectors, M p -1 time-varying domain basis vector is a candidate time-varying domain basis vector combination in a first candidate set comprisingCandidate time-varying domain basis vector combinations, M p And N 4 Are all positive integers, M p Less than N 4 The method comprises the steps of carrying out a first treatment on the surface of the The frequency domain matrix is the N of the terminal equipment 3 Selecting M from the frequency domain basis vectors v Matrix obtained by frequency domain base vectors, wherein base vectors except the first frequency domain base vector in the frequency domain matrix are M v M in the frequency domain basis vectors v -1 frequency domain basis vector, M v -1 frequency domain basis vector being one candidate frequency domain basis vector in the second candidate setQuantity combinations, including +.>Candidate frequency domain basis vector combinations, M v And N 3 Are all positive integers, M v Less than N 3 。
In some embodiments, the first indication information is further used for indicating a target base vector combination corresponding to each base vector in a first matrix, where the target base vector combination includes one or more base vectors selected by the terminal device in a target matrix, the first matrix is a matrix in a candidate matrix set, the target matrix includes one or more matrices other than the first matrix in the candidate matrix set, and the candidate matrix set includes a frequency domain matrix, a time-varying domain matrix, and an air domain matrix selected by the terminal device.
In some embodiments, the first indication information includes indication information of a target base vector combination corresponding to a first base vector, and the indication information of the target base vector combination corresponding to the first base vector includes indication information of base vectors other than a reference base vector in the target base vector combination corresponding to the first base vector, where the first base vector is a base vector corresponding to an element with a largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix, and the reference base vector is one or more base vectors corresponding to an element with a largest amplitude in the weighting coefficient matrix in the target matrix.
In some embodiments, the target matrix comprises a first target matrix and/or a second target matrix, the first target matrix being different from the second target matrix.
In some embodiments, the target basis vector combinations comprise a first target basis vector combination comprising one or more basis vectors selected by the terminal device in a first target matrix and/or a second target basis vector combination comprising one or more basis vectors selected by the terminal device in a second target matrix.
In some embodiments, the target base vector combinations include a first target base vector combination in which the number of base vectors is preconfigured or received by the terminal device and/or a second target base vector combination in which the number of base vectors is preconfigured or received by the terminal device.
In some embodiments, the number of basis vectors in the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the first basis vector in the first matrix is n k The first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the first target base vector combination corresponding to the first base vector is one candidate base vector combination in a third candidate set, and the number of candidate base vector combinations in the third candidate set is
In some embodiments, the number of basis vectors in the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix is n i The method comprises the steps of carrying out a first treatment on the surface of the The first target base vector combination corresponding to the ith base vector is one candidate base vector combination in a fourth candidate set, and the number of candidate base vector combinations in the fourth candidate set isA1 is the number of base vectors in the first matrix, and A1 is an integer greater than 1.
In some embodiments, the number of basis vectors in the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the first basis vector in the first matrix isThe first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the second target base vector combination corresponding to the first base vector is one candidate base vector combination in a fifth candidate set, and the number of candidate base vector combinations in the fifth candidate set is +.>/>
In some embodiments, the number of basis vectors in the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix is The second target base vector combination corresponding to the ith base vector is one candidate base vector combination in a sixth candidate set, and the number of candidate base vector combinations in the sixth candidate set is +.>A1 is the number of base vectors in the first matrix, and A1 is an integer greater than 1.
In some embodiments, the target base vector combinations include a first target base vector combination and/or a second target base vector combination, a sum of the numbers of base vectors in the first target base vector combination corresponding to each base vector in the first matrix being pre-configured or received by the terminal device, and a sum of the numbers of base vectors in the second target base vector combination corresponding to each base vector in the first matrix being pre-configured or received by the terminal device.
In some embodiments, the number of basis vectors of the first matrix is A1, the number of basis vectors of the first target matrix is B1, the sum of the number of basis vectors of the first target basis vector combination corresponding to each basis vector in the first matrix is N, the combination of N basis vectors is one candidate basis vector combination in the seventh candidate set, and the number of candidate basis vector combinations in the seventh candidate set is
In some embodiments, the number of basis vectors of the first matrix is A1, the number of basis vectors of the second target matrix is B2, and the sum of the number of basis vectors of the second target basis vector combination corresponding to each basis vector in the first matrix is The combination of the individual basis vectors is one candidate basis vector combination in the eighth candidate set, and the number of candidate basis vector combinations in the eighth candidate set is +.>
In some embodiments, the target base vector combination for each base vector in the first matrix is indicated by a bit map in one or more of the following cases:
the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
the terminal equipment does not receive the number of the base vectors in the target base vector combination corresponding to each base vector in the first matrix;
the sum of the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
the terminal equipment does not receive the sum of the numbers of the base vectors in the target base vector combination corresponding to each base vector in the first matrix.
In some embodiments, the first indication information is further used for indicating a position of a non-zero element in a first weighting coefficient matrix, where the first weighting coefficient matrix is a weighting coefficient matrix associated with a target base vector combination corresponding to each base vector in the first matrix; or the first weighting coefficient matrix is a weighting coefficient matrix associated with the target base vector combination corresponding to all the base vectors in the first matrix.
In some embodiments, the sum of the dimensions of the weighting coefficient matrices associated with the target base vector combination for each base vector in the first matrix is less than the dimensions of the weighting coefficient matrices associated with the target matrix.
In some embodiments, the time-varying domain basis vector in the time-varying domain matrix is used to indicate a time when the first indication information is valid, a difference between the time when the first indication information is valid and the first measurement time is a positive integer multiple of a measurement interval, the first measurement time is a time of a measurement reference signal closest to the time when the first indication information is valid, the time when the first indication information is valid is greater than the first measurement time, and the measurement interval is a difference between times of two adjacent measurement reference signals.
In some embodiments, the first indication information further includes a correspondence between a time-varying domain basis vector in the time-varying domain matrix and a first time instant, the first time instant being a starting time instant indicating that the first indication information is valid.
All relevant contents of each step related to the above method embodiment may be cited to the functional description of the corresponding functional module, which is not described herein.
In the embodiment of the present application, the terminal device 130 is presented in a form of dividing the respective functional modules in an integrated manner. A "module" herein may refer to a particular ASIC, an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that can provide the described functionality. In a simple embodiment, one skilled in the art will appreciate that the terminal device 130 may take the form of the communication apparatus 400 shown in fig. 4.
For example, the processor 401 in the communication apparatus 400 shown in fig. 4 may cause the communication apparatus 400 to execute the communication method in the above-described method embodiment by calling the computer-executable instructions stored in the memory 403.
Specifically, the functions/implementation of the transceiver module 1301 and the processing module 1302 in fig. 13 may be implemented by the processor 401 in the communication apparatus 400 shown in fig. 4 invoking computer-executed instructions stored in the memory 403. Alternatively, the functions/implementation of the processing module 1302 in fig. 13 may be implemented by the processor 401 in the communication apparatus 400 shown in fig. 4 invoking computer executable instructions stored in the memory 403, and the functions/implementation of the transceiver module 1301 in fig. 13 may be implemented by the communication interface 404 in the communication apparatus 400 shown in fig. 4.
Since the terminal device 130 provided in the embodiment of the present application may perform the above-mentioned communication method, the technical effects that can be obtained by the terminal device may refer to the above-mentioned method embodiment, and will not be described herein.
Alternatively, for example, taking a communication device as an example of the network device in the above method embodiment, fig. 14 shows a schematic structural diagram of a network device 140. The network device 140 includes a transceiver module 1401 and a processing module 1402. The transceiver module 1401 may be referred to as a transceiver unit for implementing a transceiver function, and may be, for example, a transceiver circuit, a transceiver, or a communication interface.
The transceiver module 1401 is configured to receive first indication information from a terminal device, where the first indication information is used to indicate a joint matrix selected by the terminal device, the joint matrix includes a frequency domain matrix and a time-varying domain matrix, and the first indication information includes indication information of a base vector except for a first frequency domain base vector in the frequency domain matrix, and indication information of a base vector except for the first time-varying domain base vector in the time-varying domain matrix.
In some embodiments, the first frequency domain base vector is a frequency domain base vector corresponding to an element with the largest amplitude in the weighting coefficient matrix associated with the joint matrix, and the first time-varying domain base vector is a time-varying domain base vector corresponding to an element with the largest amplitude in the weighting coefficient matrix.
In some embodiments, the time-varying domain matrix is the terminal device at N 4 Selecting M from among the individual time-varying domain basis vectors p A matrix obtained by the base vectors of the time-varying domains, wherein the base vectors except the first time-varying domain base vector in the time-varying domain matrix are M p M in individual time-varying domain basis vectors p -1 time-variant domain basis vectors, M p -1 time-varying domain basis vector is a candidate time-varying domain basis vector combination in a first candidate set comprisingCandidate time-varying domain basis vector combinations, M p And N 4 Are all positive integers, M p Less than N 4 The method comprises the steps of carrying out a first treatment on the surface of the The frequency domain matrix is the N of the terminal equipment 3 Selecting M from the frequency domain basis vectors v Matrix obtained by frequency domain base vectors, wherein base vectors except the first frequency domain base vector in the frequency domain matrix are M v M in the frequency domain basis vectors v -1 frequency domain basis vector, M v -1 frequency domain basisThe vector is a candidate frequency domain basis vector combination in a second candidate set comprising +.>Candidate frequency domain basis vector combinations, M v And N 3 Are all positive integers, M v Less than N 3 。
In some embodiments, the first indication information is further used for indicating a target base vector combination corresponding to each base vector in a first matrix, where the target base vector combination includes one or more base vectors selected by the terminal device in a target matrix, the first matrix is a matrix in a candidate matrix set, the target matrix includes one or more matrices other than the first matrix in the candidate matrix set, and the candidate matrix set includes a frequency domain matrix, a time-varying domain matrix, and an air domain matrix selected by the terminal device.
In some embodiments, the first indication information includes indication information of a target base vector combination corresponding to a first base vector, and the indication information of the target base vector combination corresponding to the first base vector includes indication information of base vectors other than a reference base vector in the target base vector combination corresponding to the first base vector, where the first base vector is a base vector corresponding to an element with a largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix, and the reference base vector is one or more base vectors corresponding to an element with a largest amplitude in the weighting coefficient matrix in the target matrix.
In some embodiments, the target matrix comprises a first target matrix and/or a second target matrix, the first target matrix being different from the second target matrix.
In some embodiments, the target basis vector combinations comprise a first target basis vector combination comprising one or more basis vectors selected by the terminal device in a first target matrix and/or a second target basis vector combination comprising one or more basis vectors selected by the terminal device in a second target matrix.
In some embodiments, the target base vector combinations include a first target base vector combination in which the number of base vectors is preconfigured or received by the terminal device and/or a second target base vector combination in which the number of base vectors is preconfigured or received by the terminal device.
In some embodiments, the number of basis vectors in the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the first basis vector in the first matrix is n k The first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the first target base vector combination corresponding to the first base vector is one candidate base vector combination in a third candidate set, and the number of candidate base vector combinations in the third candidate set is
In some embodiments, the number of basis vectors in the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix is n i The method comprises the steps of carrying out a first treatment on the surface of the The first target base vector combination corresponding to the ith base vector is one candidate base vector combination in a fourth candidate set, and the number of candidate base vector combinations in the fourth candidate set isA1 is the number of base vectors in the first matrix, and A1 is an integer greater than 1.
In some embodiments, the number of basis vectors in the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the first basis vector in the first matrix isThe first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the second target base vector combination corresponding to the first base vector is one candidate base vector combination in a fifth candidate set, and the candidate base vector combination in the fifth candidate setThe number is
In some embodiments, the number of basis vectors in the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix is The second target base vector combination corresponding to the ith base vector is one candidate base vector combination in a sixth candidate set, and the number of candidate base vector combinations in the sixth candidate set is +.>A1 is the number of base vectors in the first matrix, and A1 is an integer greater than 1.
In some embodiments, the target base vector combinations include a first target base vector combination and/or a second target base vector combination, a sum of the numbers of base vectors in the first target base vector combination corresponding to each base vector in the first matrix being pre-configured or received by the terminal device, and a sum of the numbers of base vectors in the second target base vector combination corresponding to each base vector in the first matrix being pre-configured or received by the terminal device.
In some embodiments, the number of basis vectors of the first matrix is A1, the number of basis vectors of the first target matrix is B1, the sum of the number of basis vectors of the first target basis vector combination corresponding to each basis vector in the first matrix is N, the combination of N basis vectors is one candidate basis vector combination in the seventh candidate set, and the number of candidate basis vector combinations in the seventh candidate set is/>
In some embodiments, the number of basis vectors of the first matrix is A1, the number of basis vectors of the second target matrix is B2, and the sum of the number of basis vectors of the second target basis vector combination corresponding to each basis vector in the first matrix is The combination of the individual basis vectors is one candidate basis vector combination in the eighth candidate set, and the number of candidate basis vector combinations in the eighth candidate set is +.>
In some embodiments, the target base vector combination for each base vector in the first matrix is indicated by a bit map in one or more of the following cases:
the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
the terminal equipment does not receive the number of the base vectors in the target base vector combination corresponding to each base vector in the first matrix;
the sum of the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
the terminal equipment does not receive the sum of the numbers of the base vectors in the target base vector combination corresponding to each base vector in the first matrix.
In some embodiments, the first indication information is further used for indicating a position of a non-zero element in a first weighting coefficient matrix, where the first weighting coefficient matrix is a weighting coefficient matrix associated with a target base vector combination corresponding to each base vector in the first matrix; or the first weighting coefficient matrix is a weighting coefficient matrix associated with the target base vector combination corresponding to all the base vectors in the first matrix.
In some embodiments, the sum of the dimensions of the weighting coefficient matrices associated with the target base vector combination for each base vector in the first matrix is less than the dimensions of the weighting coefficient matrices associated with the target matrix.
In some embodiments, the time-varying domain basis vector in the time-varying domain matrix is used to indicate a time when the first indication information is valid, a difference between the time when the first indication information is valid and the first measurement time is a positive integer multiple of a measurement interval, the first measurement time is a time of a measurement reference signal closest to the time when the first indication information is valid, the time when the first indication information is valid is greater than the first measurement time, and the measurement interval is a difference between times of two adjacent measurement reference signals.
In some embodiments, the first indication information further includes a correspondence between a time-varying domain basis vector in the time-varying domain matrix and a first time instant, the first time instant being a starting time instant indicating that the first indication information is valid.
In some embodiments, the transceiver module 1401 is further configured to send second indication information to the terminal device, where the second indication information is used to indicate the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix and/or the sum of the numbers of base vectors in the target base vector combination corresponding to each base vector in the first matrix.
In the present embodiment, the network device 140 is presented in a form that divides the respective functional modules in an integrated manner. A "module" herein may refer to a particular ASIC, an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that can provide the described functionality. In a simple embodiment, one skilled in the art will appreciate that the network device 140 may take the form of the communication apparatus 400 shown in fig. 4.
For example, the processor 401 in the communication apparatus 400 shown in fig. 4 may cause the communication apparatus 400 to execute the communication method in the above-described method embodiment by calling the computer-executable instructions stored in the memory 403.
Specifically, the functions/implementation of the transceiver module 1401 and the processing module 1402 in fig. 14 may be implemented by the processor 401 in the communication device 400 shown in fig. 4 invoking computer-executed instructions stored in the memory 403. Alternatively, the functions/implementation of the processing module 1402 in fig. 14 may be implemented by the processor 401 in the communication apparatus 400 shown in fig. 4 calling computer-executable instructions stored in the memory 403, and the functions/implementation of the transceiver module 1401 in fig. 14 may be implemented by the communication interface 404 in the communication apparatus 400 shown in fig. 4.
Since the network device 140 provided in this embodiment can execute the above-mentioned communication method, the technical effects obtained by the method can be referred to the above-mentioned method embodiment, and will not be described herein.
It should be understood that one or more of the above modules or units may be implemented in software, hardware, or a combination of both. When any of the above modules or units are implemented in software, the software exists in the form of computer program instructions and is stored in a memory, and a processor can be used to execute the program instructions and implement the above method flows. The processor may be built in a SoC (system on a chip) or ASIC, or may be a separate semiconductor chip. The processor may further include necessary hardware accelerators, such as field programmable gate arrays (field programmable gate array, FPGAs), PLDs (programmable logic devices), or logic circuits implementing dedicated logic operations, in addition to the cores for executing software instructions for operation or processing.
When the above modules or units are implemented in hardware, the hardware may be any one or any combination of a CPU, microprocessor, digital signal processing (digital signal processing, DSP) chip, micro control unit (microcontroller unit, MCU), artificial intelligence processor, ASIC, soC, FPGA, PLD, special purpose digital circuitry, hardware accelerator, or non-integrated discrete devices that may run the necessary software or that do not rely on software to perform the above method flows.
Optionally, embodiments of the present application further provide a communication device (for example, the communication device may be a chip or a chip system), where the communication device includes a processor, and the method is used to implement any of the method embodiments described above. In one possible design, the communication device further includes a memory. The memory for storing the necessary program instructions and data, and the processor may invoke the program code stored in the memory to instruct the communication device to perform the method of any of the method embodiments described above. Of course, the memory may not be in the communication device. When the communication device is a chip system, the communication device may be formed by a chip, or may include a chip and other discrete devices, which is not specifically limited in the embodiments of the present application.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using a software program, it 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 the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, a website, computer, server, or data center via a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc. that can be integrated with the 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 DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.
Although the present application has been described herein in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the figures, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the present application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the present application. It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims (29)

1. A method of communication, the method comprising:
the method comprises the steps that a terminal device generates first indication information, wherein the first indication information is used for indicating a joint matrix selected by the terminal device, the joint matrix comprises a frequency domain matrix and a time-varying domain matrix, the first indication information comprises indication information of base vectors except a first frequency domain base vector in the frequency domain matrix, and indication information of base vectors except the first time-varying domain base vector in the time-varying domain matrix;
and the terminal equipment sends the first indication information to network equipment.
2. The method of claim 1, wherein the first frequency domain basis vector is a frequency domain basis vector corresponding to an element with a largest amplitude in a weighting coefficient matrix associated with the joint matrix, and the first time-varying domain basis vector is a time-varying domain basis vector corresponding to an element with a largest amplitude in the weighting coefficient matrix.
3. The method according to claim 1 or 2, characterized in that the time-varying domain matrix is the terminal device at N 4 Selecting M from among the individual time-varying domain basis vectors p A matrix obtained from a plurality of time-varying domain basis vectors, the basis of the time-varying domain matrix being other than the first time-varying domain basis vector Vector is the M p M in individual time-varying domain basis vectors p -1 time-variant domain basis vector, said M p -1 time-varying domain basis vector is a candidate time-varying domain basis vector combination in a first candidate set comprisingCandidate time-varying domain basis vector combinations, M p And N 4 Are all positive integers, M p Less than N 4 ；
The frequency domain matrix is the N of the terminal equipment 3 Selecting M from the frequency domain basis vectors v A matrix obtained by frequency domain base vectors, wherein the base vectors except the first frequency domain base vector in the frequency domain matrix are M v M in the frequency domain basis vectors v -1 frequency domain basis vector, said M v -1 frequency domain basis vector is a candidate frequency domain basis vector combination in a second candidate set comprisingCandidate frequency domain basis vector combinations, M v And N 3 Are all positive integers, M v Less than N 3 。
4. A method according to any of claims 1-3, wherein the first indication information is further used to indicate a target basis vector combination corresponding to each basis vector in a first matrix, the target basis vector combination including one or more basis vectors selected by the terminal device in a target matrix, wherein the first matrix is a matrix in a candidate matrix set, the target matrix includes one or more matrices other than the first matrix in the candidate matrix set, and the candidate matrix set includes a frequency domain matrix, a time-varying domain matrix, and a spatial domain matrix selected by the terminal device.
5. The method of claim 4, wherein the first indication information includes indication information of a target base vector combination corresponding to a first base vector, and the indication information of the target base vector combination corresponding to the first base vector includes indication information of base vectors other than a reference base vector in the target base vector combination corresponding to the first base vector, where the first base vector is a base vector corresponding to an element with a largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix, and the reference base vector is one or more base vectors corresponding to an element with a largest amplitude in the weighting coefficient matrix in the target matrix.
6. The method according to claim 4 or 5, wherein the target matrix comprises a first target matrix and/or a second target matrix, the first target matrix being different from the second target matrix.
7. The method according to claim 6, wherein the target basis vector combinations comprise a first target basis vector combination comprising one or more basis vectors selected by the terminal device in the first target matrix and/or a second target basis vector combination comprising one or more basis vectors selected by the terminal device in the second target matrix.
8. The method according to any of claims 4-7, wherein the target basis vector combinations comprise a first target basis vector combination and/or a second target basis vector combination, the number of basis vectors in the first target basis vector combination being preconfigured or received by the terminal device and the number of basis vectors in the second target basis vector combination being preconfigured or received by the terminal device.
9. The method of claim 8, wherein the number of basis vectors in the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the first basis vector in the first matrix is n k The first basis vectorThe basis vector corresponding to the element with the largest amplitude in the weighting coefficient matrix associated with the target matrix in the first matrix is obtained; the first target base vector combination corresponding to the first base vector is one candidate base vector combination in a third candidate set, and the number of candidate base vector combinations in the third candidate set is
10. The method according to claim 8 or 9, wherein the number of basis vectors of the first target matrix is B1, and the number of basis vectors in the first target basis vector combination corresponding to the i-th basis vector except the first basis vector in the first matrix is n i The method comprises the steps of carrying out a first treatment on the surface of the The first target base vector combination corresponding to the ith base vector is one candidate base vector combination in a fourth candidate set, and the number of candidate base vector combinations in the fourth candidate set isi e {1, 2..a.1-1 }, A1 being the number of basis vectors in the first matrix, A1 being an integer greater than 1.
11. The method according to any one of claims 8-10, wherein the number of basis vectors of the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the first basis vector in the first matrix isThe first base vector is a base vector corresponding to an element with the largest amplitude in a weighting coefficient matrix associated with the target matrix in the first matrix; the second target base vector combination corresponding to the first base vector is one candidate base vector combination in a fifth candidate set, and the number of candidate base vector combinations in the fifth candidate set is +.>
12. The method according to any one of claims 8-11, wherein the number of basis vectors of the second target matrix is B2, and the number of basis vectors in the second target basis vector combination corresponding to the ith basis vector except the first basis vector in the first matrix is The second target base vector combination corresponding to the ith base vector is one candidate base vector combination in a sixth candidate set, and the number of candidate base vector combinations in the sixth candidate set is +.>i e {1, 2..a.1-1 }, A1 being the number of basis vectors in the first matrix, A1 being an integer greater than 1.
13. The method according to claims 4-7, characterized in that the target basis vector combinations comprise a first target basis vector combination and/or a second target basis vector combination, the sum of the number of basis vectors in the first target basis vector combination corresponding to each basis vector in the first matrix being preconfigured or received by the terminal device, and the sum of the number of basis vectors in the second target basis vector combination corresponding to each basis vector in the first matrix being preconfigured or received by the terminal device.
14. The method of claim 13, wherein the number of basis vectors of the first matrix is A1, the number of basis vectors of the first target matrix is B1, the sum of the number of basis vectors of the first target basis vector combination corresponding to each basis vector in the first matrix is N, the combination of the N basis vectors is one candidate basis vector combination in a seventh candidate set, and the number of candidate basis vector combinations in the seventh candidate set is
15. The method according to claim 13 or 14, wherein the number of basis vectors of the first matrix is A1, the number of basis vectors of the second target matrix is B2, and the sum of the numbers of basis vectors of the second target basis vector combination corresponding to each basis vector in the first matrix isSaid->The combination of the individual basis vectors is one candidate basis vector combination in an eighth candidate set, and the number of candidate basis vector combinations in the eighth candidate set is +.>
16. The method according to any of claims 4-15, wherein the target basis vector combination for each basis vector in the first matrix is indicated by a bit map in one or more of the following cases:
the number of the base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
the terminal equipment does not receive the number of the base vectors in the target base vector combination corresponding to each base vector in the first matrix;
the sum of the numbers of the base vectors in the target base vector combination corresponding to each base vector in the first matrix is not preconfigured;
and the terminal equipment does not receive the sum of the numbers of the base vectors in the target base vector combination corresponding to each base vector in the first matrix.
17. The method according to any one of claims 4-16, wherein the first indication information is further used to indicate a position of a non-zero element in a first weighting coefficient matrix, where the first weighting coefficient matrix is a weighting coefficient matrix associated with a target base vector combination corresponding to each base vector in the first matrix; or, the first weighting coefficient matrix is a weighting coefficient matrix associated with the target base vector combination corresponding to all the base vectors in the first matrix.
18. The method of claim 17, wherein the sum of the dimensions of the weighting factor matrices associated with the target base vector combinations for each base vector in the first matrix is less than the dimensions of the weighting factor matrices associated with the target matrix.
19. The method according to any one of claims 1-18, wherein a time-varying domain basis vector in the time-varying domain matrix is used to indicate a time when the first indication information is valid, a difference between the time when the first indication information is valid and a first measurement time is a positive integer multiple of a measurement interval, the first measurement time is a time of a measurement reference signal closest to the time when the first indication information is valid, and the time when the first indication information is valid is greater than the first measurement time, and the measurement interval is a difference between times of two adjacent measurement reference signals.
20. The method according to any one of claims 1-19, wherein the first indication information further comprises a correspondence between a time-varying domain basis vector in the time-varying domain matrix and a first time instant, the first time instant being a starting time instant indicating that the first indication information is valid.
21. A method of communication, the method comprising:
the network device receives first indication information from the terminal device, wherein the first indication information is used for indicating a joint matrix selected by the terminal device, the joint matrix comprises a frequency domain matrix and a time-varying domain matrix, the first indication information comprises indication information of base vectors except for a first frequency domain base vector in the frequency domain matrix, and indication information of base vectors except for the first time-varying domain base vector in the time-varying domain matrix.
22. The method of claim 21, wherein the first indication information is further used to indicate a target base vector combination corresponding to each base vector in a first matrix, the target base vector combination including one or more base vectors selected by the terminal device in a target matrix, wherein the first matrix is a matrix in a candidate matrix set, the target matrix includes one or more matrices other than the first matrix in the candidate matrix set, and the candidate matrix set includes a frequency domain matrix, a time-varying domain matrix, and a spatial domain matrix selected by the terminal device.
23. The method of claim 22, wherein the method further comprises:
the network device sends second indication information to the terminal device, where the second indication information is used to indicate the number of base vectors in the target base vector combination corresponding to each base vector in the first matrix and/or the sum of the numbers of base vectors in the target base vector combination corresponding to each base vector in the first matrix.
24. A communication device for performing the communication method according to any of claims 1-20.
25. A communication device for performing the communication method according to any of claims 21-23.
26. A communication device, comprising:
a processor coupled to the memory; the processor configured to execute a computer program stored in the memory, to cause the communication apparatus to perform the communication method according to any one of claims 1 to 20, or to cause the communication apparatus to perform the communication method according to any one of claims 21 to 23.
27. A communication device, comprising:
A processor and interface circuit; the interface circuit is used for receiving code instructions and transmitting the code instructions to the processor;
the processor is configured to execute the code instructions to cause the communication device to perform the communication method of any one of claims 1-20 or to cause the communication device to perform the communication method of any one of claims 21-23.
28. A communication device comprising a processor and a transceiver for information interaction between the communication device and other communication devices, the processor executing program instructions to cause the communication device to perform the communication method of any one of claims 1-20 or to cause the communication device to perform the communication method of any one of claims 21-23.
29. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a computer program or instructions which, when run on a computer, cause the computer to perform the communication method of any one of claims 1-20 or cause the computer to perform the communication method of any one of claims 21-23.
CN202211215651.3A 2022-09-30 2022-09-30 Communication method and communication device Pending CN117811623A (en)

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