CN111385005B

CN111385005B - Vector indication method for constructing precoding vector and communication device

Info

Publication number: CN111385005B
Application number: CN201910224252.5A
Authority: CN
Inventors: 金黄平; 王潇涵; 毕晓艳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-12-29
Filing date: 2019-03-22
Publication date: 2021-10-26
Anticipated expiration: 2039-03-22
Also published as: CN112436874B; CN113557684A; KR20210109011A; CN113557684B; KR102547471B1; CN112436874A; CN111385005A

Abstract

The application provides a vector indication method for constructing a precoding vector and a communication device. The method comprises the following steps: the terminal device generates a CSI report and transmits the CSI report to the network device. The CSI report is used to indicate the number of space-frequency vector pairs reported for R transmission layers, and the indicated overhead of the number of space-frequency vector pairs is independent of the number of transmission layers R. By fixing the indication overhead, the indication of the number of space-frequency vector pairs reported for the R transport layers may be designed in the first part of the CSI report, so that the network device may decode the first part based on the determined length. The network device may determine the overhead of the second portion according to the information in the first portion, so as to decode the second portion and obtain the information in the CSI report. Therefore, the successful decoding of the CSI report can be ensured, and the subsequent data transmission performance can be ensured.

Description

Vector indication method for constructing precoding vector and communication device

The present application claims priority of chinese patent application with chinese patent office, application number 201811641071.4, application name "vector indication method for constructing precoding vector and communication apparatus" filed on 29/12/2018 and chinese patent application with chinese patent office, application number 201910169583.3, application name "vector indication method for constructing precoding vector and communication apparatus" filed on 6/3/2019, the entire contents of which are incorporated herein by reference.

Technical Field

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

Background

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

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

However, in the case that the number of transmission layers is different, the number of space-domain vectors and/or the number of frequency-domain vectors fed back by the terminal device may be different, and the indication overhead caused by the feedback may also be different. This may cause that the feedback overhead of a CSI (channel state information) report cannot be predicted, which results in decoding failure of the CSI report and affects subsequent data transmission performance.

Disclosure of Invention

The application provides a vector indication method and a communication device for constructing a precoding vector, so as to guarantee successful decoding of a CSI report.

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

Specifically, the method comprises the following steps: generating a CSI report, wherein the CSI report is used for indicating the number of space-frequency vector pairs reported aiming at R transmission layers, and the indication cost of the number of the space-frequency vector pairs is irrelevant to the number R of the transmission layers; each space-frequency vector pair comprises a space-frequency vector and a frequency-domain vector, and the space-frequency vector pairs reported by the R-th transmission layer in the R transmission layers are used for constructing precoding vectors corresponding to each frequency-domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers; and sending the CSI report.

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

Specifically, the method comprises the following steps: receiving a CSI report, wherein the CSI report is used for indicating the number of space-frequency vector pairs reported aiming at R transmission layers, and the indication cost of the number of the space-frequency vector pairs is irrelevant to the number R of the transmission layers; each space-frequency vector pair comprises a space-frequency vector and a frequency-domain vector, and the space-frequency vector pairs reported by the R-th transmission layer in the R transmission layers are used for constructing precoding vectors corresponding to each frequency-domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers; and determining a space domain vector and a frequency domain vector for constructing a precoding vector according to the CSI report.

Based on the above design, the terminal device may generate a fixed length indication field in the CSI report, so that the network device may determine the indication overhead of other indication information according to the fixed length indication field. The network device may analyze other indication information except the number of the space-frequency vector pairs according to the CSI report, so as to obtain other information that can be used for constructing a precoding vector, reported by the terminal device, such as the space-frequency vector pairs and the corresponding weighting coefficients thereof. Thus, successful decoding of CSI reports by the network device may be guaranteed. The network equipment can construct a precoding matrix of each frequency domain unit according to the information obtained by decoding, thereby being beneficial to ensuring the subsequent data transmission performance. In addition, the precoding vector constructed based on the space-frequency vector pair and the weighting coefficient reported by the terminal equipment is determined based on the downlink channels on the plurality of frequency domain units, and the correlation of the frequency domain is utilized, so that the precoding vector can be well adapted to the downlink channels, and higher feedback precision can be ensured. Compared with the feedback method of the type II (type II) codebook in the prior art, the feedback overhead is not increased along with the increase of the number of frequency domain units, which is beneficial to reducing the feedback overhead.

It should be understood that reporting the space-frequency vector pair and the weighting coefficient that can be used for constructing the precoding vector through the CSI report can be implemented by the prior art, and the application does not limit the specific method for the terminal device to indicate the space-frequency vector pair and the weighting coefficient corresponding thereto.

With reference to the first aspect or the second aspect, in some implementations, the CSI report is further used to indicate a location of a space-frequency vector pair reported for each of the R transport layers.

Optionally, the position of the space-frequency vector pair reported by each of the R transport layers is indicated by a bitmap; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected.

And indicating the selected space-frequency vector pairs in the plurality of space-frequency vector pairs through a bitmap, wherein the total number of the selected space-frequency vector pairs is the number of the space-frequency vector pairs reported by the R transport layers. Thus, the number of space-frequency vector pairs reported for R transport layers may be indicated indirectly by a bitmap. Furthermore, since the selected pair of space-frequency vectors is selected from the plurality of pairs of space-frequency vectors, the selected pair of space-frequency vectors is indicated by the bitmap, that is, the relative positions of the selected pair of space-frequency vectors in the plurality of pairs of space-frequency vectors are indirectly indicated.

Optionally, the position of the space-frequency vector pair reported by each of the R transport layers is indicated by R indexes; wherein, the R-th index of the R indexes is an index of a combination of space-frequency vector pairs reported by the R-th transport layer in a plurality of space-frequency vector pairs.

With reference to the first aspect or the second aspect, in some implementations, the indicated overhead of the number of space-frequency vector pairs is: r is from 1 to R_mDetermined by the middle traversal value

Maximum value of (d); k_rThe reporting number of the space-frequency vector pairs which are pre-configured for the R-th transmission layer when the number of the transmission layers is R is shown, R_mFor a predefined maximum number of transmission layers, K_r≥1，R_mNot less than 1 and K_rAnd R_mAre all integers.

Thus, the network device may determine the number of space-frequency vectors reported for each of the R transport layers. With reference to the first aspect or the second aspect, in some implementations, the indicated overhead of the number of space-frequency vector pairs is: r is from 1 to R_mDetermined during traversal of the middle

Therefore, the terminal equipment can determine the total number of the space-frequency vectors reported by aiming at the R transmission layers.

Based on the above two types of indication overhead, it can be seen that the indication overhead of the number of space-frequency vector pairs is independent of the number of transmission layers R. Which indicates that the size of the overhead may be a fixed value.

With reference to the first aspect or the second aspect, in some implementations, the number of space-frequency vector pairs reported for the R transport layers indicates that the number of space-frequency vector pairs is located in the first part of the CSI report.

Since the indication overhead for the number of space-frequency vector pairs reported by the R transport layers may be a fixed value, the indication may be designed in the first part of the CSI report so that the network device decodes based on the overhead of the predefined first part. And the network device may further determine, according to the number of the space-frequency vector pairs, an indication overhead of the weighting coefficients reported for the R transport layers and other related overheads, thereby determining a length of the second portion to decode the second portion.

With reference to the first or second aspect, in certain implementations, the CSI report is further configured to indicate one or more spatial vectors and one or more frequency-domain vectors reported for each of the R transmission layers; wherein the space-frequency vector pair reported for the r transport layer is selected from L _rA space vector sum M_rL determined by a frequency domain vector_r×M_rA plurality of space-frequency vector pairs; wherein L is_rIs the number of space-domain vectors, M, reported for the r-th transport layer_rIs the number of frequency domain vectors reported for the r-th transport layer, L_r≥1，M_rNot less than 1, and L_rAnd M_rAre all integers.

The pair of space-frequency vectors reported for each transport layer may be selected from a plurality of pairs of space-frequency vectors. The plurality of space-frequency vector pairs may be determined by the terminal device according to a predefined set of space-frequency vectors and a predefined set of frequency-domain vectors. That is, a part of vectors are selected from the spatial vector set and the frequency domain vector set, and then space-frequency vector pairs constructed by the part of vectors are further selected for constructing precoding vectors. That is, the selection range of the space-frequency vector pair for constructing the precoding vector is narrowed, and the space-frequency vector pair for constructing the precoding vector is indicated by indicating the relative position of the space-frequency vector pair for constructing the precoding vector in the plurality of space-frequency vector pairs, so that the indication overhead can be reduced.

Optionally, the space-frequency vectors reported for any two transport layers are the same.

That is, multiple transport layers may share the same spatial vector or vectors. When indicating the space vector reported for each transport layer, the terminal device may indicate the space vectors reported for R transport layers by using the same indication information, or may indicate the space vectors reported for R transport layers only once.

Optionally, the frequency domain vectors reported for any two transport layers are at least partially the same.

That is, multiple transmission layers may share a portion of the frequency domain vector. For example, M frequency domain vectors are reported for the 1 st transport layer, and M/2 frequency domain vectors are reported for the 2 nd transport layer. The terminal device may indicate the M frequency domain vectors and the relative positions of the M/2 frequency domain vectors in the M frequency domain vectors. The indication overhead can be reduced compared to reporting frequency domain vectors for each transport layer.

With reference to the first or second aspect, in certain implementations, the CSI report is further used to indicate a weighting factor reported for each transport layer.

The network device may determine the precoding vector corresponding to each frequency domain unit based on the space-frequency vector pair and the weighting coefficient reported for each transmission layer, and then determine the precoding matrix corresponding to each frequency domain unit.

With reference to the first or second aspect, in certain implementations, the CSI report includes a second portion including a first field, a second field, and a third field. The first field comprises an indication of a space-frequency vector reported for each transport layer, the second field comprises an indication of a frequency-domain vector reported for each transport layer, the third field comprises an indication of a weighting coefficient reported for each transport layer, and the fourth field comprises an indication of a location of a space-frequency vector pair reported for each transport layer; or the first field comprises an indication of a frequency domain vector reported for each transport layer, the second field comprises an indication of a space domain vector reported for each transport layer, the third field comprises an indication of a weighting coefficient reported for each transport layer, and the fourth field comprises an indication of a position of a space-frequency vector pair reported for each transport layer; wherein the space domain vector reported for the r-th transmission layer and the frequency domain vector reported for the r-th transmission layer are used for determining L _r×M_rA space-frequency vector pair. The fields in the second portion are named first, second and third fields here merely to facilitate distinguishing the different roles. In fact, each field may further include a sub-field corresponding to each transport layer, which is not limited in this application.

With reference to the first aspect, in some implementations of the first aspect, an encoding order of the fields in the second portion is: the first field precedes the second field, the second field precedes the fourth field, and the fourth field precedes the third field; and the information in each field is sequentially coded according to the sequence from the first transmission layer to the Rth transmission layer.

It should be understood that the coding order referred to herein may be understood as the order of the bit sequence corresponding to each field in the bit sequence generated by one CSI report. For example, the bit sequences corresponding to the fields in the second portion may be input to the encoder in this order. Thus, the order of encoding the fields as described herein does not represent multiple independent encodings of the fields. The fields in the second part may be encoded as a whole, e.g. belonging to an encoded block.

Accordingly, with reference to the second aspect, in some implementations of the second aspect, the decoding order of the fields in the second part is: the first field precedes the second field, the second field precedes the fourth field, and the fourth field precedes the third field; and the information in each field is decoded in sequence from the first transmission layer to the Rth transmission layer.

It should be understood that the decoding order referred to herein may be understood as the order in which the CSI reports are parsed. For example, the bit sequences corresponding to the fields in the second part may be input to a decoder in this order for decoding. Therefore, the encoding order of the fields as referred to herein does not represent multiple independent decoding of the fields. The fields in the second part are decodable as a whole, e.g. belong to a decoding block.

With reference to the first aspect or the second aspect, in some implementations, in case that the scheduled transmission resources are smaller than the transmission resources required for the CSI report, the method further includes:

determining the discarded information in the second part according to the sequence of the priority levels from low to high, wherein the priority level of the third field is lower than that of the second field, and the priority level of the second field is lower than that of the first field; and the priority of the information in each field is decreased in the order from the first transport layer to the R-th transport layer.

By discarding the information in the second part in the order from low priority to high priority, more important indication information, such as a weighting coefficient of a stronger space-frequency vector pair, can be retained to the maximum extent, so that the precoding vector recovered by the network device based on the CSI report that has discarded a part of information can still be better adapted to the channel.

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

Specifically, the method comprises the following steps: generating a Channel State Information (CSI) report, wherein the CSI report comprises a bitmap, and the length of the bitmap is independent of the number R of transmission layers; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit being used for indicating whether the corresponding space-frequency vector pair is selected; the space-frequency vector pair reported by the R transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency domain unit on the R transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers; and sending the CSI report.

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

Specifically, the method comprises the following steps: receiving a CSI report, wherein the CSI report comprises a bitmap, and the length of the bitmap is independent of the number R of transmission layers; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit being used for indicating whether the corresponding space-frequency vector pair is selected; each space-frequency vector pair comprises a space-frequency vector and a frequency-domain vector, and the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency-domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers;

and determining a space-frequency vector pair reported by aiming at each transmission layer according to the CSI report.

Based on the above design, the terminal device may generate a fixed-length bitmap in the CSI report, so that the network device may determine the indication overhead of other indication information according to the fixed-length bitmap. The network device may analyze other indication information except the space-frequency vector pair according to the CSI report, so as to obtain other information that can be used for constructing a precoding vector, reported by the terminal device, such as a weighting coefficient corresponding to the space-frequency vector pair. Thus, successful decoding of CSI reports by the network device may be guaranteed. The network equipment can construct a precoding matrix of each frequency domain unit according to the information obtained by decoding, thereby being beneficial to ensuring the subsequent data transmission performance. In addition, the precoding vector constructed based on the space-frequency vector pair and the weighting coefficient reported by the terminal equipment is determined based on the downlink channels on the plurality of frequency domain units, and the correlation of the frequency domain is utilized, so that the precoding vector can be well adapted to the downlink channels, and higher feedback precision can be ensured. Compared with the feedback method of the type II (type II) codebook in the prior art, the feedback overhead is not increased along with the increase of the number of frequency domain units, which is beneficial to reducing the feedback overhead.

It should be understood that reporting the weighting coefficients that can be used to construct the precoding vector through the CSI report can be implemented by the prior art, and the application does not limit the specific method for indicating the weighting coefficients by the terminal device.

With reference to the third or fourth aspect, in some implementations, the number of polarization directions of the transmit antennas is 2, and the length of the bitmap is 2 lxmxr_mOne bit, R_mIs the maximum value of the predefined transmission layer number R, L is the traversal value of R from 1 to R, and R from 1 to R_mL determined by middle traversal value_rM is R is traversed in 1 to RValue and R is from 1 to R_mM determined by middle traversal value_rIs measured.

In this design, for the number of transmission layers R, the first 2 lxmxr bits in the bitmap take effect, and the remaining bits can be filled with any value, so that the length of the bitmap can be guaranteed to be a fixed value.

With reference to the third aspect or the fourth aspect, in some implementations, the number of polarization directions of the transmit antennas is 2, the length of the bitmap is 2 lxmx 2 bits, L is a value traversed by R in 1 to R, and R is 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R_mM determined by middle traversal value_rMaximum value of (1), R _mIs a predefined maximum value of the number of transmission layers R.

In this design, for the number of transport layers R ═ 1, the first 2 lxm bits in the bitmap take effect, and the remaining bits can be filled with arbitrary values; for the number of transmission layers R > 1, all bits in the bitmap are valid. Thus, the length of the bitmap may be a fixed value.

With reference to the third aspect or the fourth aspect, in some implementations, the number of polarization directions of the transmit antennas is 2, the length of the bitmap is 2 lxm bits, L is a value traversed by R from 1 to R, and R is from 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R_mM determined by middle traversal value_rMaximum value of (1), R_mIs a predefined maximum value of the number of transmission layers R.

In this design, all bits in the bitmap are in effect for any number of transport layers R. And the length of the bitmap may be a fixed value.

With reference to the first aspect or the third aspect, in certain implementations, the method further includes: and receiving first indication information, wherein the first indication information is used for indicating the reporting number of the space-frequency vector pairs configured for each transmission layer.

Accordingly, with reference to the second or fourth aspect, in certain implementations, the method further comprises: and sending first indication information, wherein the first indication information is used for indicating the reporting number of the space-frequency vector pairs configured for each transmission layer.

The terminal device may determine the number of space-frequency vector pairs to be reported for each transport layer according to the configuration of the network device. Moreover, if the indication of the number of space-frequency vector pairs reported for R transport layers in the first aspect or the second aspect is placed in the first part of the CSI report, the network device and the terminal device may determine the indication overhead of the number of space-frequency vector pairs reported for each transport layer based on the same reporting number.

It should be understood that the number of reports of space-frequency vector pairs configured for each transport layer may be greater than the number of actual reports. For example, when the magnitude quantization value of the weighting coefficient of some space-frequency vector pairs is zero, reporting may not be performed.

With reference to the first aspect or the third aspect, in certain implementations, the method further includes: and receiving second indication information, wherein the second indication information is used for indicating the reporting number of the space domain vectors configured for each transmission layer.

Accordingly, with reference to the second or fourth aspect, in certain implementations, the method further comprises: and sending second indication information, wherein the second indication information is used for indicating the reporting number of the space domain vectors configured for each transmission layer.

The terminal device may determine the number of space vectors that need to be reported for each transport layer according to the configuration of the network device. And the network equipment and the terminal equipment can determine the length of the bitmap based on the reported number of the same space vector.

With reference to the first aspect or the third aspect, in certain implementations, the method further includes: and receiving third indication information, wherein the third indication information is used for indicating the reporting number of the frequency domain vectors configured for each transmission layer.

Accordingly, with reference to the second or fourth aspect, in certain implementations, the method further comprises: and sending third indication information, wherein the third indication information is used for indicating the reporting number of the frequency domain vectors configured for each transmission layer.

The terminal device may determine the number of frequency domain vectors that need to be reported for each transport layer according to the configuration of the network device. And the network device and the terminal device can determine the length of the bitmap based on the reported number of the same frequency domain vectors.

With reference to any one of the first aspect to the fourth aspect, in some implementations, when the determined weighting coefficient for each transmission layer is multiple, the multiple weighting coefficients correspond to at least two priority levels, where the at least two priority levels include a first priority level and a second priority level, a magnitude of the weighting coefficient corresponding to the first priority level is greater than or equal to a magnitude of the weighting coefficient corresponding to the second priority level, a priority level of the weighting coefficient of each transmission layer corresponding to the first priority level is higher than a priority level of the weighting coefficient of each transmission layer corresponding to the second priority level, and among the weighting coefficients of the multiple transmission layers corresponding to the same priority level, the priority levels of the weighting coefficients of each transmission layer in the R transmission layers decrease in an order from the first transmission layer to the R-th transmission layer.

In the case that the transmission resources scheduled by the network device are not enough to carry the CSI report, in order to reserve the weighting coefficients of the stronger space-frequency vector pair to a greater extent, the weighting coefficients may be further divided into a plurality of priorities. The terminal device may discard the weighting coefficients of low priority first and then discard the weighting coefficients of high priority. Thereby being beneficial to reserving more weighting coefficients of stronger space-frequency vector pairs.

With reference to any one of the first to fourth aspects, in some implementations, when the determined weighting coefficient for each transmission layer is multiple, the number of quantization bits of the multiple weighting coefficients is determined by at least two quantization levels; the at least two quantization levels include a first quantization level and a second quantization level, and the number of quantization bits of the weighting coefficient corresponding to the first quantization level is greater than the number of quantization bits of the weighting coefficient corresponding to the second quantization level.

In order to use more bit overhead for stronger space-frequency vector pairs, the weighting coefficients may be divided into multiple quantization levels. The weighting coefficients of the stronger pair of space-frequency vectors are quantized using more quantization bits and the weighting coefficients of the weaker pair of space-frequency vectors are quantized using fewer quantization bits. Therefore, the limited indication bits can be reasonably utilized to feed back, so that the precoding matrix recovered by the network equipment is better adapted to the channel.

Further, in the third field, the priority of the weighting coefficient of each transmission layer corresponding to the first quantization level is higher than the priority of the weighting coefficient of each transmission layer corresponding to the second quantization level; and in the weighting coefficients of a plurality of transmission layers corresponding to the same quantization level, the priority of the weighting coefficient of each transmission layer in the R transmission layers is decreased progressively according to the sequence from the first transmission layer to the Rth transmission layer.

The weighting coefficients corresponding to more quantization bits may have a higher priority and the weighting coefficients corresponding to less quantization bits may have a lower priority. Different priorities can be distinguished through different quantization levels, so that the terminal equipment can discard the weighting coefficients with low priority first and then discard the weighting coefficients with high priority. Thereby being beneficial to reserving more weighting coefficients of stronger space-frequency vector pairs.

With reference to any one of the first to fourth aspects, in certain implementations, a quantized value of an amplitude of the weighting coefficient corresponding to the first quantization level is greater than or equal to a quantized value of an amplitude of the weighting coefficient corresponding to the second quantization level.

That is, a quantized value of the amplitude of the weighting coefficient may be taken as a basis for dividing the quantization level. With reference to any one of the first aspect to the fourth aspect, in some implementations, a number of quantization bits of a phase in a weighting coefficient corresponding to a first quantization level is greater than a number of quantization bits of a phase in a weighting coefficient corresponding to a second quantization level.

That is, the weighting coefficients of higher quantization levels may use more quantization bits, and the weighting coefficients of lower quantization levels may use fewer quantization bits. The weighting coefficients of the stronger pair of space-frequency vectors are quantized using more quantization bits and the weighting coefficients of the weaker pair of space-frequency vectors are quantized using fewer quantization bits. Therefore, the limited indication bits can be reasonably utilized to feed back, so that the precoding matrix recovered by the network equipment is better adapted to the channel.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Drawings

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

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

fig. 3 to 8 are schematic diagrams of a second part of a CSI report provided by an embodiment of the present application;

FIG. 9 is a schematic flow chart diagram of a vector indication method for constructing a precoding vector according to another embodiment of the present application;

fig. 10 to 15 are schematic diagrams of a second part of a CSI report provided by another embodiment of the present application;

fig. 16 is a schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 17 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

fig. 18 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

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

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

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

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

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

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

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

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

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

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

In order to facilitate understanding of the embodiments of the present application, the following description is briefly made of terms related to the embodiments of the present application.

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

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

2. Channel State Information (CSI) report (report): in a wireless communication system, information describing channel properties of a communication link is reported by a receiving device (e.g., a terminal device) to a transmitting device (e.g., a network device). CSI reports may also be referred to simply as CSI.

The CSI report may include, for example, but not limited to, a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), a Channel Quality Indicator (CQI), a channel state information reference signal (CSI-RS resource indicator (CRI)), and a Layer Indicator (LI), etc.

Take the example that the terminal device reports the CSI to the network device.

The terminal device may report one or more CSI reports in a time unit (e.g., a slot), where each CSI report may correspond to a configuration condition for CSI reporting. The configuration condition for CSI reporting may be determined by CSI reporting configuration (CSI reporting setting), for example. The CSI reporting configuration may be used to indicate a time domain behavior, a bandwidth, a format corresponding to a report quality (report quality), and the like of CSI reporting. The time domain behavior includes, for example, periodicity (periodic), semi-persistence (semi-persistent), and aperiodicity (aperiodic). The terminal device may generate a CSI report based on a CSI reporting configuration.

Reporting one or more CSI reports by a terminal device in a time unit, such as a timeslot, may be referred to as one CSI report.

In the embodiment of the present application, when generating the CSI report, the terminal device may divide information indicating a precoding vector into two parts. For example, the CSI report may include a first portion and a second portion. The first portion and the second portion may be independently encoded. Wherein the payload size (size) of the first portion may be predefined, and the payload size of the second portion may be determined according to the information carried in the first portion.

The network device may decode the first portion according to a predefined payload size of the first portion to obtain the information carried in the first portion. The network device may determine the payload size of the second portion from the information obtained from the first portion and then decode the second portion to obtain the information carried in the second portion.

It is to be understood that the function of the first part and the second part may be similar to the function of part 1(part 1) and part 2(part 2) of CSI, respectively, as defined in the NR protocol TS38.214 version 15(release15, R15).

It should also be understood that, since the embodiments of the present application mainly relate to reporting of PMIs, the following embodiments only refer to relevant information of PMIs and do not refer to others for listing contents in the first part and the second part of CSI report. It should be understood that this should not constitute any limitation to the present application. In addition to the information contained or indicated by the first and second portions of the CSI report listed in the embodiments below, the first portion of the CSI report may also include one or more of RI, CQI, and LI, or may also include other information that may predefine the feedback overhead, and the second portion of the CSI report may also include other information. This is not a limitation of the present application.

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

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

The precoding matrix may be obtained by performing Singular Value Decomposition (SVD) on the channel matrix or a covariance matrix of the channel matrix, or may be obtained by performing eigenvalue decomposition (EVD) on the covariance matrix of the channel matrix. It should be understood that the determination manner of the precoding matrix listed above is only an example, and should not constitute any limitation to the present application. The determination of the precoding matrix can be made by referring to the prior art, and for the sake of brevity, it is not listed here.

It should be noted that, with the vector indication method for constructing a precoding vector provided in the embodiment of the present application, the network device may determine, based on the feedback of the terminal device, a space-frequency vector pair for constructing a precoding vector, and further determine a precoding matrix corresponding to each frequency domain unit. The precoding matrix can be directly used for downlink data transmission; the precoding matrix finally used for downlink data transmission may also be obtained through some beamforming methods, for example, including zero-forcing (ZF), regularized zero-forcing (RZF), minimum mean-squared error (MMSE), signal-to-leakage-and-noise (SLNR), and so on. This is not a limitation of the present application. Unless otherwise specified, the precoding matrices referred to hereinafter may refer to precoding matrices determined based on the methods provided herein.

4. Precoding vector: a precoding matrix may comprise one or more vectors, such as column vectors. One precoding matrix may be used to determine one or more precoding vectors.

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

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

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

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

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

Alternatively, the spatial vector is taken from a Discrete Fourier Transform (DFT) matrix. Each column vector in the DFT matrix may be referred to as a DFT vector. In other words, the spatial vector may be a DFT vector. The spatial vector may be, for example, a DFT vector defined in a type ii (type ii) codebook of the NR protocol TS 38.214 version 15(release 15, R15).

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

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

The N is_sA spatial vector can be written, for example

The N is_sThe space vector can construct a matrix U_s，

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

O < th > in the set of spatial vectors_s(0≤o_s≤O_s-1 and o_sIs an integer) of subsets_sThe spatial vectors can be respectively written as

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

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

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

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

Optionally, the length of the frequency domain vector is the number of partial or all frequency domain units included in the frequency domain occupied bandwidth of the CSI measurement.

Wherein, the frequency domain occupied bandwidth of the CSI measurement resource may be a bandwidth for transmitting a reference signal. The reference signal may be a reference signal used for channel measurement, such as CSI-RS used for downlink channel measurement. In this embodiment of the present application, the length of the frequency domain vector may be the number of all frequency domain units included in the frequency domain occupied bandwidth of the CSI measurement, or may also be the number of partial frequency domain units included in the frequency domain occupied bandwidth of the CSI measurement, which is not limited in this application. For example, the protocol may define a rule to determine the length of the frequency domain vector from the frequency domain occupied bandwidth of the CSI measurement.

In NR, the signaling indicating the Frequency domain occupied bandwidth of the CSI measurement resource may be, for example, a CSI-Frequency occupancy bandwidth range (CSI-Frequency occupancy).

It should be understood that the frequency domain occupied bandwidth of the CSI measurement resource is named only for convenience of description, and should not constitute any limitation to the present application, which does not exclude the possibility of expressing the same meaning by other names. It should also be understood that CSI-Frequency occupancy is an example of signaling for indicating the bandwidth occupied by the Frequency domain of the CSI measurement resource, and should not be construed as limiting the application in any way, and the application does not exclude the possibility of defining other signaling in future protocols to achieve the same or similar functions.

Optionally, the length of the frequency domain vector is a length of a signaling for indicating a position and a number of the frequency domain units to be reported.

In NR, the signaling for indicating the location and number of frequency domain units to be reported may be reporting bandwidth (reporting band). The signaling may indicate the locations and the number of the frequency domain units to be reported in the form of a bitmap, for example. Thus, the dimension of the frequency domain vector may be the number of bits of the bitmap. It should be understood that the reporting band is only an example of signaling for indicating the location and number of frequency domain units reported with the band, and should not be construed as limiting the present application in any way. This application does not exclude the possibility of defining other signalling in future protocols to perform the same or similar functions.

Optionally, the length of the frequency domain vector is the number of frequency domain units to be reported.

The number of frequency domain units to be reported may be indicated by the signaling of the reporting bandwidth, for example. The number of frequency domain units to be reported may be all frequency domain units in the frequency domain occupied bandwidth of the CSI measurement resource, or may also be a part of frequency domain units in the frequency domain occupied bandwidth of the CSI measurement resource; or, the number of frequency domain units to be reported may be the same as the signaling length of the reporting bandwidth, or may be smaller than the signaling length of the reporting bandwidth. This is not a limitation of the present application.

How the length of the frequency domain unit is defined in detail may be predefined by the protocol. The length of the frequency domain unit may be one of those listed above, or may be defined by other possible parameters. This is not a limitation of the present application.

When the protocol defines that the length of the frequency domain vector is a certain item listed above, a certain item in the signaling for indicating the bandwidth occupied by the frequency domain of the CSI measurement resource or the signaling for indicating the position and number of the frequency domain units to be reported may be considered to implicitly indicate the length of the frequency domain vector.

For convenience of explanation, it is assumed hereinafter that the frequency domain vector is denoted as u_fVector u of frequency domain_fHas a length of N_f，N_fIs more than or equal to 1 and is an integer. The frequency domain vector may be of length N_fA column vector or a row vector. This is not a limitation of the present application.

10. Set of frequency domain vectors: frequency domain vectors of a variety of different lengths may be included. In the embodiment of the present application, the length of the space vector is N_fTherefore, the length of each frequency domain vector in the frequency domain vector set to which the frequency domain vector belongs reported by the terminal device is N_f。

In one possible design, the set of frequency domain vectors may include N_fA frequency domain vector. The N is_fThe frequency domain vectors can be orthogonal to each other two by two. Each frequency domain vector in the set of frequency domain vectors may be taken from a DFT matrix.

The N is_fA frequency domain vector can be written, for example

The N is_fThe matrix U can be constructed by the frequency domain vectors_f，

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

O < th > in the set of frequency domain vectors_f(0≤o_f≤O_f-1 and o_sIs an integer) of subsets_fThe frequency domain vectors can be respectively recorded as

Based on the o_fN of the subset_sThe beam vectors can form a matrix

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

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

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

The space-frequency component matrix may be represented by a dimension of N_s×N_fThe space-frequency component matrix can also be expressed as a dimension N_s×N_fOf the matrix of (a). The dimension is N_s×N_fMay include N_fEach length is N_sThe column vector of (2). The N is_fA column vector mayWith N_fEach column vector may be used to determine a precoding vector for the corresponding frequency domain element.

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

wherein, w₁To

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

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

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

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

13. And (3) double-domain compression: including spatial domain compression and frequency domain compression. Spatial compression may refer to the selection of one or more spatial vectors in a set of spatial vectors as vectors to construct a precoding vector. Frequency domain compression may refer to the selection of one or more frequency domain vectors in a set of frequency domain vectors as vectors for constructing a precoding vector. The matrix constructed by one spatial domain vector and one frequency domain vector may be, for example, the spatial-frequency component matrix described above. The selected one or more spatial vectors and one or more frequency domain vectors may construct one or more matrices of space-frequency components. The weighted sum of the one or more space-frequency component matrices may be used to construct a space-frequency matrix corresponding to one transmission layer. In other words, the space-frequency matrix may be approximated as a weighted sum of the space-frequency component matrices constructed from the selected one or more space-frequency vectors and one or more frequency-domain vectors described above. Further, a precoding vector corresponding to each frequency domain unit can be determined.

The dual-domain compression is performed in both spatial and frequency domains, and the terminal device may feed back the selected one or more spatial vectors and one or more frequency-domain vectors to the network device during feedback, without feeding back the weighting coefficients (e.g., including amplitude and phase) of the sub-bands separately on a per frequency-domain unit (e.g., sub-band) basis. Thus, feedback overhead can be greatly reduced. Meanwhile, since the frequency domain vector can represent the change rule of the channel in frequency, the change of the channel in frequency domain is simulated by linear superposition of one or more frequency domain vectors. Therefore, higher feedback accuracy can still be maintained, so that the precoding matrix recovered by the network device based on the feedback of the terminal device can still be well adapted to the channel.

For details of the dual-domain compression, reference may be made to the patent application entitled "method for indicating and determining a precoding vector and communication device" entitled "under application number 201811263110.1. A detailed description of the specific contents is omitted here for the sake of brevity.

14. Weighting factor, amplitude and phase: the weighting coefficients are used to represent the weights of the matrices of space-frequency components when used in a weighted sum to determine the space-frequency matrix. For example, the space-frequency matrix described above may be approximated as a weighted sum of a plurality of space-frequency component matrices, and the weighting coefficient may represent a weight of each of the plurality of space-frequency component matrices.

Each one of which isThe weighting coefficients may include amplitude and phase. For example, the weighting coefficients ae^jθWhere a is the amplitude and θ is the phase.

Among the weighting coefficients corresponding to the space-frequency component matrices, the amplitude (or amplitude) of some weighting coefficients may be zero or close to zero, and the corresponding quantization value may be zero. The weighting coefficient for quantizing the amplitude by quantizing the value zero may be referred to as a weighting coefficient for which the amplitude is zero. Correspondingly, the magnitude of some weighting coefficients is larger, and the corresponding quantization values are not zero. A weighting coefficient that quantizes amplitude by a non-zero quantization value may be referred to as a weighting coefficient whose amplitude is non-zero. In other words, the plurality of weighting factors consists of one or more weighting factors whose amplitudes are non-zero and one or more weighting factors whose amplitudes are zero.

It should be understood that the weighting coefficients may be indicated by quantized values, indexes of quantized values, or unquantized values, and the application is not limited to the manner of indicating the weighting coefficients as long as the opposite end knows the weighting coefficients. Hereinafter, for convenience of explanation, information indicating the weighting coefficients is referred to as quantization information of the weighting coefficients. The quantization information may be, for example, a quantization value, an index, or any other information that may be used to indicate a weighting coefficient.

15. A transmission layer: the number of transmission layers is the rank of the channel matrix. The terminal device may determine the number of transmission layers according to a channel matrix obtained by channel estimation. A precoding matrix may be determined from the channel matrix. For example, the precoding matrix may be determined by SVD on a channel matrix or a covariance matrix of the channel matrix. In the SVD process, different transport layers may be distinguished according to the size of the eigenvalues. For example, the precoding vector determined by the eigenvector corresponding to the largest eigenvalue may be associated with the 1 st transmission layer, and the precoding vector determined by the eigenvector corresponding to the smallest eigenvalue may be associated with the R-th transmission layer. That is, the eigenvalues corresponding to the 1 st to R-th transport layers decrease in sequence.

It should be understood that distinguishing between different transport layers based on characteristic values is only one possible implementation and should not constitute any limitation to the present application. For example, the protocol may also define other criteria for distinguishing the transport layers in advance, which is not limited in this application.

In addition, in order to facilitate understanding of the embodiments of the present application, the following description is made.

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

R: the number of transmission layers, in the embodiment of the application, R is more than or equal to 1, and R is an integer; the R transport layers may include, for example, a first transport layer through an R transport layer. For convenience of description, the vector indication method for constructing a precoding vector provided in the embodiment of the present application is described below by taking an R-th transmission layer as an example, where a value of R may be an integer value from 1 to R.

R_m: the maximum value of the predefined number of transmission layers, i.e. 1 ≦ R_m。R_mThe value of (d) may be defined by a protocol, for example. Alternatively, R_mIs 4;

p: the number of polarization directions of the transmitting antenna is more than or equal to 1, and P is an integer;

l: the maximum number in the number of space domain vectors corresponding to each transmission layer in the R transmission layers can be preconfigured, L is more than or equal to 1, and L is an integer;

m: the maximum number of the frequency domain vectors corresponding to each transmission layer in the R transmission layers can be pre-configured, M is more than or equal to 1 and is an integer;

L_r: when the number of the transmission layers is R, the number of space domain vectors configured for the R-th transmission layer is L ≥ L_rNot less than 1, and L_rIs an integer;

M_r: when the number of the transmission layers is R, the number of frequency domain vectors configured for the R-th transmission layer is more than or equal to M_rNot less than 1, and M_rIs an integer;

K_r: the reported number of space-frequency vector pairs configured for the R-th transmission layer when the number of transmission layers is R, K _rIs more than or equal to 1 and is an integer. Because the space-frequency vector pair reported by each transmission layer corresponds to the weighting coefficient, the reporting number of the space-frequency vector pairs configured for the r-th transmission layer is alsoMay refer to the number of reports of the weighting coefficients configured for the r-th transport layer.

The parameter K_rThe reporting number of all weighting coefficients (or space-frequency vector pairs) configured for the r-th transmission layer may be referred to, or the reporting number of partial weighting coefficients (or space-frequency vector pairs) configured for the r-th transmission layer may be referred to.

The number of partial weighting coefficients may be indicated because the protocol may predefine the minimum number of weight coefficients (or space-frequency vector pairs) to report for each transport layer, or the protocol may predefine the number of weight coefficients (or space-frequency vector pairs) that must be reported for each r transport layers. In this case, the parameter K_rCan mean that: the number of the weighting coefficients excluding the minimum reporting number of the weighting coefficients predefined for the r-th transmission layer is originally configured for the r-th transmission layer. For example, the total number of weighting coefficients configured for the r-th transport layer is Q, and the minimum reporting number of weighting coefficients predefined for the r-th transport layer is a _rThen the parameter K_rMay be Q-a_r. Wherein, Q and a_rAre all positive integers.

The minimum reported number of the weighting coefficients predefined for the r-th transmission layer may include, for example, the number of normalization coefficients, which may include, for example, a plurality of normalization coefficients corresponding to a plurality of polarization directions, or one normalization coefficient in a plurality of polarization directions. The specific weighting coefficient corresponding to the minimum reporting number is not limited in the application.

In addition, when the number of transmission layers is greater than 1, the minimum number of reports of the predefined weighting coefficients for each transmission layer may be the same, may be partially different, or may be different from each other. This is not a limitation of the present application.

K: r is from 1 to R_mThe maximum value of the number of reports of the space-frequency vector pairs pre-configured for each of the R transmission layers determined by the middle traversal value, or R is from 1 to R_mFor each of the R transport layers determined by the middle traversal valueAnd the maximum value of the reported number of the configured weighting coefficients. In other words, K is L determined by traversal of R from 1 to R and traversal of R from 1 to 4_rIs measured. K is more than or equal to 1 and is an integer;

T_r: the number of space-frequency vector pairs, T, reported by the r-th transmission layer_r≤K_rAnd T is_rAre integers.

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

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

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

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

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

The specific indication method may be any of various existing indication methods, such as, but not limited to, the above indication methods, various combinations thereof, and the like. The specific details of various indication modes can refer to the prior art, and are not described in detail herein. As can be seen from the above description, when a plurality of information of the same type are required to be indicated, for example, different information may be indicated differently. In a specific implementation process, a required indication manner may be selected according to a specific need, and the indication manner selected in the embodiment of the present application is not limited, so that the indication manner related to the embodiment of the present application should be understood to cover various methods that enable a party to be indicated to obtain information to be indicated.

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

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

Sixthly, the definitions listed herein for many characteristics (e.g., kronecker product, PMI, frequency domain unit, spatial domain vector, frequency domain vector, and weighting coefficient of space-frequency vector pair, etc.) are only used to explain the functions of the characteristics by way of example, and the details thereof can be referred to the prior art.

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

Eighth, in the embodiments shown below, "pre-configuration" may be indicated in advance through signaling, or may be determined through a preset rule, and the present application is not limited to a specific implementation manner thereof. Corresponding to "pre-configuration," actual reporting "may refer to information actually reported by the terminal device to the network device based on channel measurements. For example, the number of reports of the space domain vectors preconfigured for a certain transmission layer may refer to the number of space domain vectors that need to be reported for the transmission layer, and therefore, the number of reports of the space domain vectors configured for a certain transmission layer may be greater than or equal to the number of actually reported space domain vectors; for another example, the number of reported frequency domain vectors preconfigured for a certain transmission layer may refer to the number of frequency domain vectors that need to be reported for the transmission layer, and therefore, the number of reported frequency domain vectors configured for a certain transmission layer may be greater than or equal to the number of actually reported frequency domain vectors; for another example, the number of reports of the weighting coefficients preconfigured for a certain transmission layer may refer to the number of space-frequency vector pairs that need to be reported for the transmission layer, and therefore, the number of reports of space-frequency vector pairs configured for a certain transmission layer may be greater than or equal to the number of weighting coefficients actually reported, and the like.

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

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

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

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

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

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

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

Fig. 2 is a schematic flow chart of a vector indication method 200 for constructing a precoding vector provided by an embodiment of the present application, which is shown from the perspective of device interaction. As shown, the method 200 may include steps 210 through 230. The steps in method 200 are described in detail below.

In step 210, the terminal device generates a CSI report, which includes a bitmap, the length of which is independent of the number R of transmission layers.

The plurality of indicator bits in the bitmap may correspond to a plurality of space-frequency vector pairs. Each indication bit may be used to indicate whether a corresponding pair of space-frequency vectors is selected. When each indication bit in the bitmap indicates whether the corresponding space-frequency vector pair is selected, that is, indicates the space-frequency vector pair selected for each transport layer, or the space-frequency vector pair reported for each transport layer.

For example, when a certain indication bit is "0", it indicates that the corresponding space-frequency vector pair is not selected; when a certain indication bit is set to "1", it indicates that the corresponding space-frequency vector pair is selected. Thus, the total number of indicator bits "1" in the bitmap may represent the number of space-frequency vector pairs reported for the R transport layers. The total number of "1" in the indication bits corresponding to the r-th transport layer in the bitmap may represent the number of space-frequency vector pairs reported for the r-th transport layer. The corresponding relationship between each indication bit and each transport layer in the bitmap is described in detail below with reference to specific embodiments, and the detailed description of the corresponding relationship is omitted here for the moment.

It should be understood that the values of the indicator bits recited herein are meant to be exemplary only and should not be construed as limiting the application in any way.

The selected space-frequency vector pair is a space-frequency vector pair used for constructing a precoding vector. Each space-frequency vector pair may include one space-frequency vector and one frequency-domain vector. Alternatively, each space-frequency vector pair is defined by a space-frequency vector and a frequency-domain vector. The number of space-frequency vector pairs reported for the same transport layer may be one or more. When the number of space-frequency vector pairs reported for the same transmission layer is multiple, the space-frequency vector and/or frequency-domain vector included in any two space-frequency vector pairs are different, or at least one of the space-frequency vector and the frequency-domain vector included in any two space-frequency vector pairs is different.

In the embodiment of the present application, the space-frequency vector pair reported for each transport layer may be selected from a plurality of space-frequency vector pairs. The plurality of space-frequency vector pairs may be predefined, for example, predefined by the network device and the terminal device, or defined by a protocol; the plurality of pairs of space-frequency vectors may also be determined and reported to the network device by the terminal device, e.g., the terminal device determines and reports one or more space-frequency vectors and one or more frequency-domain vectors for each transport layer, which may determine one or more pairs of space-frequency vectors. Accordingly, the bitmap may include sub-bitmaps corresponding to a plurality of transport layers. The plurality of indicator bits in each sub-bitmap may correspond to a plurality of space-frequency vector pairs on a transport layer. When each indication bit indicates whether the corresponding space-frequency vector pair is selected, it is equivalent to indicating the selected space-frequency vector pair in the plurality of space-frequency vector pairs corresponding to the plurality of indication bits. Or, the relative position of the space-frequency vector pairs reported for each of the R transport layers among the plurality of space-frequency vector pairs is indicated.

Since the network device may predetermine a plurality of space-frequency vector pairs corresponding to the plurality of indication bits in the bitmap, such as predefined or reported by the terminal device (as indicated by the field of the second part described later), the network device may determine the space-frequency vector pair used for constructing the precoding vector by indicating the relative position of the space-frequency vector pair reported for each transport layer in the plurality of space-frequency vector pairs.

For convenience of explanation, it is assumed that the terminal device may report one or more spatial vectors and one or more frequency domain vectors for each transport layer. The space-frequency vector pairs reported by the terminal device for each transport layer may be selected from a plurality of space-frequency vector pairs determined by space-frequency vectors and frequency-domain vectors.

Taking the R-th transmission layer of the R transmission layers as an example, it is assumed that the number of space-frequency vector pairs reported by the terminal device for the R-th transmission layer is T_r(T_rIs an integer and is more than or equal to 1). The T is_rThe space-frequency vector pairs may be formed from L_r(L_rNot less than 1 and integer) airspace vector sum M_r(M_rNot less than 1 and integer) frequency domain vectors_r×M_rOne or more selected pairs of space-frequency vectors from the plurality of pairs of space-frequency vectors. The L is_rA space vector sum M_rThe frequency domain vector may be determined by the terminal device and reported to the network device, for example.

In this embodiment of the present application, the number of space-frequency vector pairs reported by at least two transmission layers in the R transmission layers may be different, and the number of space-frequency vector pairs reported by any two transmission layers in the R transmission layers may also be the same, which is not limited in this application.

The number of space-frequency vector pairs to be reported for each transport layer, for example, the number K of space-frequency vector pairs to be reported for the r-th transport layer_rAnd may be predefined or indicated directly or indirectly by the network device through signaling. This is not a limitation of the present application.

Optionally, the method further comprises: and receiving first indication information, wherein the first indication information is used for indicating the reporting number of the space-frequency vector pairs configured for each transmission layer. Accordingly, the network device transmits the first indication information.

The network device may carry the first indication information through a higher layer signaling, such as an RRC message or an MAC CE, or a physical layer signaling, such as DCI, for example, so as to indicate the number of reported space-frequency vector pairs configured for each transport layer to the terminal device. The application does not limit the specific signaling carrying the first indication information.

In one possible design, the first indication information may indicate a maximum value K of the reported number of space-frequency vector pairs configured for each of the R transport layers. Wherein the maximum value K may be replaced by a minimum value, an average value, or the like. The terminal device may determine, based on a predefined rule, the number of reports corresponding to each transport layer according to the value indicated by the first indication information and the number of transport layers. In this case, the first indication information indirectly indicates the number of reports of space-frequency vector pairs configured for each transport layer.

Take the example that the first indication information indicates the maximum value K. The predefined rule may be, for example: when R is 1, the reporting number K of the space-frequency vector pairs configured for one transmission layer₁Is the maximum value K; when R is 2, the reporting number K of the space-frequency vector pairs configured for the two transmission layers₁And K₂Is the maximum value K; when R is 3, space-frequency vector configured for 1 st transmission layerThe reported number of pairs is the maximum value K, and the reported number of space-frequency vector pairs configured for the 2 nd transmission layer and the 3 rd transmission layer is half K/2 of the maximum value; and when R is 4, the reporting number of the space-frequency vector pairs configured for each transmission layer is half K/2 of the maximum value.

As mentioned above, the protocol may also predefine the minimum number of reports of weighting coefficients for each transport layer. Therefore, when the first indication information is used to indicate a maximum value K of the number of reported null-frequency vector pairs configured for each of the R transmission layers, the maximum value K may be a maximum value of the total number of reported null-frequency vector pairs configured for each of the R transmission layers (that is, a maximum value of the R total number of reported null-frequency vector pairs configured for the R transmission layers), or may be a value obtained by subtracting a minimum number of reported null-frequency vector pairs from a maximum value of the total number of reported null-frequency vector pairs configured for each of the R transmission layers. The maximum value K may be a maximum value of R total reporting numbers configured for the R transmission layers, where the total reporting number configured for the R transmission layer indicates a total reporting number of a space-frequency vector pair (or a weighting coefficient) configured for the R transmission layer.

It should be noted that the minimum number of reports and the maximum number described herein correspond to the same transport layer. For example, the total reported number of the weighting coefficients configured for the first transmission layer of the R transmission layers is a maximum value of the total reported numbers of the weighting coefficients configured for each transmission layer of the R transmission layers, e.g., K, the first indication information may indicate the total reported number of the weighting coefficients configured for the first transmission layer, or may indicate a value obtained by subtracting a minimum reported number of the weighting coefficients predefined for the first transmission layer from the total reported number of the weighting coefficients configured for the first transmission layer, e.g., K-a₁，a₁Representing the minimum number of reports of weighting coefficients predefined for the first transport layer, a₁Is a positive integer.

For example, assume that the maximum value among the total number of reports of space-frequency vector pairs configured for each of R transport layers is 8. The maximum value is the total reported number of space vector pairs configured for the first transport layer. If the minimum number of reported space-frequency vector pairs predefined for the first transport layer is 2, the first indication information may indicate 8 or 6 (i.e., obtained from 8-2).

The specific rule that the first indication information indicates the maximum value K may be predefined by a protocol or pre-negotiated by the network device and the terminal device. The network device and the terminal device may indicate and determine the maximum value K of the total number of reports of the space-frequency vector pairs configured for each of the R transport layers according to the same rule.

It should be understood that the above-listed rules are only examples and should not constitute any limitation to the present application. The relationship between the number of reported space-frequency vector pairs configured for each transport layer and the maximum value will be described in detail later with reference to specific embodiments. It can be understood that, when the values indicated by the first indication information are different in meaning, the predefined rule for determining the number of reported space-frequency vector pairs corresponding to each transport layer is also different.

It should also be understood that the maximum, minimum and average values recited above are but a few of the possible implementations and should not constitute any limitation on the present application.

In another possible design, the first indication information may directly indicate the number of reports of space-frequency vector pairs configured for each transport layer when R is different values. The terminal equipment can directly determine the number of the space-frequency vector pairs which need to be reported for each transmission layer according to the first indication information and the number of the transmission layers.

When the first indication information is used for indicating the reporting number of the space-frequency vector pairs configured for each transport layer, the first indication information may directly indicate the total reporting number of the space-frequency vector pairs, or may indicate the reporting number of the space-frequency vector pairs after the minimum reporting number of the space-frequency vector pairs corresponding to each transport layer is excluded.

Or, when the first indication information is used to indicate the reporting number of the weighting coefficients configured for each transport layer, the first indication information may directly indicate the total reporting number of the weighting coefficients, or may indicate the reporting number of the weighting coefficients after the minimum reporting number of the weighting coefficients corresponding to each transport layer is excluded.

For example, the number of reports of the space-frequency vector pair configured for the r-th transport layer by the first indication information is K_r，K_rIs a positive integer. Then K is_rThe number of the null-frequency vector pairs configured for the r-th transport layer may be the total reporting number, or a value obtained by subtracting the minimum reporting number of the null-frequency vector pairs predefined for the r-th transport layer from the total reporting number of the null-frequency vector pairs configured for the r-th transport layer.

The specific rule for configuring the number of reported space-frequency vector pairs for each transport layer may be predefined by a protocol, or negotiated in advance by the network device and the terminal device. The network device and the terminal device may indicate and determine the total number of reports of the space-frequency vector pairs configured for each of the R transport layers according to the same rule.

In yet another possible design, the first indication information may be the same indication information as the second indication information or the third indication information listed below. For example, a relationship between the number of reported space-frequency vector pairs configured for each transport layer and the number of reported space-frequency vectors may be predefined, or a relationship between the number of reported space-frequency vector pairs configured for each transport layer and the number of reported frequency-domain vectors may be predefined, or a relationship between the number of reported space-frequency vector pairs configured for each transport layer and the number of reported space-frequency vectors and the number of reported frequency-domain vectors may be predefined. That is, the number of reported space-frequency vector pairs may have a corresponding relationship with the number of reported space-frequency vectors, or the number of reported space-frequency vector pairs may have a corresponding relationship with the number of reported frequency-domain vectors, or the number of reported space-frequency vector pairs may have a corresponding relationship with the number of reported space-frequency vectors and the number of reported frequency-domain vectors. Therefore, when the network device indicates the number of reported space-frequency vectors and/or frequency-domain vectors configured for each transmission layer, the terminal device may determine the number of reported space-frequency vector pairs configured for each transmission layer according to the number of reported space-frequency vector pairs and the number of reported space-frequency vectors and/or frequency-domain vectors. It can be understood that, when the values indicated in the first indication information have different meanings, the predefined rule for determining the number of reports corresponding to each transport layer is also different.

In addition, the number of reports of the space-frequency vector pairs configured for each transport layer may also be predefined, for example, defined by a protocol. For example, the protocol may predefine the number of reports of space-frequency vector pairs configured for each transport layer when R is a different value, or the maximum value K, or the protocol predefine the number of reports of space-frequency vectors and/or frequency-domain vectors configured for each transport layer when R is a different value, and the like. This is not a limitation of the present application.

It should be noted that, for some weighting coefficients with zero quantized values of amplitudes, corresponding amplitudes and phases may not be reported correspondingly, or the terminal device may not report weighting coefficients with zero quantized values of amplitudes. Therefore, the number of the empty-frequency vector pairs actually reported to the network device by the terminal device for R transport layers may be less than or equal to the preconfigured number of reports, and therefore may also be less than or equal to the maximum value of the preconfigured number of reports. For example, for the r-th transport layer, T_r≤K_r≤K。

As described above, when the terminal device indicates whether the corresponding space-frequency vector pair is selected through each indication bit in the bitmap, it is equivalent to implicitly indicating the number and position of the space-frequency vector pairs reported for each transport layer. The terminal device can be used for weighted summation aiming at one or more space-frequency vector pairs reported by each transmission layer so as to construct precoding vectors corresponding to each frequency domain unit on each transmission layer. Thus, each pair of space-frequency vectors may correspond to a weighting coefficient. Therefore, the terminal device indicates, through the bitmap, the number and positions of the space-frequency vector pairs reported for the R transport layers, or may also be understood as that the terminal device indicates, through the bitmap, the number and positions of the weighting coefficients reported for the R transport layers.

The specific process of indicating the number and positions of space-frequency vector pairs reported for R transport layers by means of a bitmap is described in detail below. In this embodiment of the present application, in addition to indicating the number of space-frequency vector pairs reported for R transmission layers, the terminal device may further indicate, through a CSI report, a weighting coefficient and the like corresponding to the space-frequency vector pair. Therefore, when describing different implementations, the information carried by each part in the CSI report will be further described in conjunction with the first part and the second part of the CSI report. It should be understood, however, that the various examples set forth below are presented only for the purpose of providing a better understanding of the methods provided herein and are not intended to constitute any limitation herein.

Assuming that the number of polarization directions of the transmitting antennas is 1, for the R-th transmission layer of the R transmission layers, the corresponding indication bit in the sub-bitmap may be L_r×M_rIs to be connected with L_rA space vector sum M_rL determined by a frequency domain vector_r×M_rThere are pairs of space-frequency vectors. The sub-bitmap length corresponding to the r-th transport layer may be equal to L configured for each transport layer_rAnd M_rIs correlated. In other words, the length of the bitmap may be related to the number of reported space and frequency domain vectors configured for each transport layer. For example, the length of the bitmap may be R from 1 to R _mDetermined by the middle traversal value

Is measured.

If L is_rIs equal to L, and M_rThe mapping relationship between the L × M indication bits and the L × M space-frequency vector pairs in the sub-bitmap corresponding to the r-th transmission layer may be related to the combination of the space-frequency vector and the frequency-domain vector in the L × M space-frequency vector pairs. For example, the L × M space-frequency vector pairs corresponding to the L × M indicator bits may be arranged in an order of traversing M frequency-domain vectors first and then traversing L space-domain vectors, or may be arranged in an order of traversing L space-domain vectors first and then traversing M frequency-domain vectors.

Let L spatial vectors selected from the set of spatial vectors be denoted as

The M frequency domain vectors selected from the set of frequency domain vectors are denoted as

If the M frequency domain vectors are traversed first and then the L space-frequency vectors are traversed, the arrangement order of the L × M space-frequency vector pairs may be

There are a total of L × M space-frequency vector pairs. For the sake of brevity, this is not listed here. The L × M bits in the bitmap correspond one-to-one to the L × M space-frequency vector pairs described above.

If the L space-frequency vectors are traversed first and then the M frequency-domain vectors are traversed, the arrangement order of the L × M space-frequency vector pairs may be

The specific method for indicating the reported position of the space-frequency vector pair through the sub-bitmap is briefly described above by taking the r-th transport layer as an example. For any one of the multiple transport layers, the terminal device may indicate the position of the reported space-frequency vector pair based on the same manner. The sub-bitmaps corresponding to the R transport layers may be concatenated together to form a bitmap indicating reporting for the R transport layers.

For convenience of distinction and explanation, a bitmap for indicating the position of the space-frequency vector pair reported by each of the R transport layers is hereinafter referred to as a sub-bitmap. R sub-bitmaps may be included in the bitmaps corresponding to the R transport layers.

In the embodiment of the present application, the length of the bitmap may be a fixed value. Alternatively, the length of the bitmap may be independent of the number of transport layers R. In one possible design, the hairThe number of polarization directions of the radiating antennas is 1, and the length of the bitmap can be L multiplied by M multiplied by R_m。

I.e. the length of the bitmap may be in accordance with a predefined maximum number of transmission layers R_mTo design. For R transport layers, the first lxmxr bits in the bitmap take effect. Here, validation may mean that it can be used to indicate the location of the space-frequency vector pair.

Specifically, the length is L × M × R _mMay include R_mEach sub-bitmap may correspond to a plurality of space-frequency vector pairs on a transport layer. For example, when the actual number R of transmission layers is 1, the first L × M bits in the bitmap take effect, which may be referred to as indication bits; the last lx × M × 03 bits do not have any effect, and the last lx 2 × 3 bits may be referred to as invalid bits, which may be filled with any value, e.g., may be zero-padded, with respect to the first lx 1M indication bits; when the actual number of transmission layers R is 2, the first lxmx 2 bits in the bitmap take effect, and the last lxmx 2 bits may be any bits; when the actual number R of transmission layers is 3, the first lxm × 3 bits in the bitmap are effective, the last lxm bits may be any bits, and so on. For the sake of brevity, this is not illustrated individually.

Where the invalid bits are still considered part of the bitmap. In other words, the bitmap may include an indication bit that is actually valid and an invalid bit. The indication bit and the invalid bit may be taken as a whole. For example, the indication bit and the invalid bit may be encoded as belonging to one coding block, and may be encoded as a whole. It should be understood that the indication bit and the invalid bit mentioned herein belong to one coding block, and do not mean that the coding block only contains the indication bit and the invalid bit, and the coding block may also include other more information bits, which is not limited in this application. Hereinafter, the description of the same or similar cases will be omitted for the sake of brevity.

It should be understood that the sequential positions of the indication bit and the invalid bit are only examples, and should not limit the present application in any way. For example, the invalid bit may also precede the indication bit.

It should be noted that the present application is illustrativeThe invalid bit is treated as part of the bitmap in the embodiment. The bitmap can be used as an indication field for indicating the positions of the space-frequency vector pairs reported for the R transport layers. For different numbers of transmission layers R, the length of the bitmap is a fixed value, i.e. the length of the indication field is a fixed value. This should not be construed as limiting the application in any way. There may be different understandings for the indication field. For example, the indication field may also include only the indication bits actually valid in the bitmap. For other bits than the indication bit actually valid in the bitmap, any value may be padded, for example, a series of invalid bits with a value of "0" may be padded, so as to ensure that the total length of the indication bit and the invalid bits is not changed under different R values. At this time, the padded string of invalid bits having a value of "0" is a part outside the indication field. This portion, where the bits that may fill in any value are invalid, may not be interpreted by the network device. The bits that this part may fill in with an arbitrary value are called padding bits or supplementary bits. If the padding bits are considered as a part outside the indication field, the length defined above is L × M × R _mMay include an indication field and padding bits. In this case, only the actually valid indication bit in the bitmap is treated as the indication field. The length of the indication field may be related to the number of transmission layers. For example, in the above design, the length of the indication field may be L × M × R.

As an example, R_mThe length of the bitmap is L × M × 4, 4.

Optionally, for R sub-bitmaps in the bitmap, the number L of space vectors_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 1:

TABLE 1

As shown in table 1, when R is 1, the number of reported space-frequency vector pairs is K, that is, the total number of space-frequency vector pairs reported by the terminal device is K. The K space-frequency vector pairs are selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

When R is 2, the total number of the space-frequency vector pairs reported by the terminal device for 2 transport layers is 2K. And the number of the space-frequency vector pairs reported by each transmission layer is K. The K space-frequency vector pairs reported for each transport layer are selected from L x M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

It should be understood that the L spatial vectors corresponding to the 1 st transmission layer and the L spatial vectors corresponding to the 2 nd transmission layer may be the same or different; the M frequency domain vectors corresponding to the 1 st transmission layer and the M frequency domain vectors corresponding to the 2 nd transmission layer may be the same or different. This is not a limitation of the present application.

When R is 3, the total number of space-frequency vector pairs reported by the terminal device for 3 transport layers is 2K. The number of the space-frequency vector pairs reported by the 1 st transmission layer is K, and the K space-frequency vector pairs can be selected from L multiplied by M space-frequency vector pairs reported by L space-frequency vectors and M frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 2 nd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L multiplied by M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors; the number of the space-frequency vector pairs reported for the 3 rd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L multiplied by M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

It should be understood that the L space vectors corresponding to the 3 transmission layers may be the same or different; the M frequency domain vectors corresponding to the 3 transport layers may be the same or different. This is not a limitation of the present application.

Here, the L spatial vectors corresponding to the 3 transport layers are the same, and may mean that spatial vectors corresponding to any two transport layers of the 3 transport layers are the same. That is, the 3 transport layers may share L space vectors. The L spatial vectors corresponding to the 3 transmission layers are different, which may mean that spatial vectors corresponding to at least two transmission layers of the 3 transmission layers are different. That is, the 3 transport layers may not share L spatial vectors. The spatial vectors corresponding to the 3 transmission layers may be independent of each other.

Similarly, the M frequency domain vectors corresponding to the 3 transmission layers are the same, which may mean that the frequency domain vectors corresponding to any two transmission layers in the 3 transmission layers are the same. That is, the 3 transport layers may share M frequency domain vectors. The M frequency domain vectors corresponding to the 3 transmission layers are different, which may mean that the frequency domain vectors corresponding to at least two transmission layers of the 3 transmission layers are different. That is, the 3 transport layers may not share M frequency domain vectors. The frequency domain vectors corresponding to the 3 transmission layers, respectively, may be independent of each other.

Hereinafter, the description of the same or similar cases is omitted for the sake of brevity.

When R is 4, the total number of space-frequency vector pairs reported by the terminal device for 4 transport layers is 2K. And the number of the space-frequency vector pairs reported by aiming at each transmission layer is K/2. The K/2 space-frequency vector pairs reported for each transport layer may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

It should be understood that the L space vectors corresponding to the 4 transmission layers may be the same or different; the M frequency domain vectors corresponding to the 4 transmission layers may be the same or different. This is not a limitation of the present application.

In the above, 3 transmission layers are taken as an example to explain the understanding that L spatial vectors corresponding to the 3 transmission layers are the same or different and M frequency domain vectors corresponding to the 3 transmission layers are the same or different, and for the sake of brevity, the description is not repeated here.

In another possible design, the number of polarization directions of the transmit antennas is 1, and the length of the bitmap may be L × M × 2.

When R is_mThe length of the bitmap is smaller than in the previous design > 2. When R < 2, such as R ═ 1, the first L × M bits in the bitmap take effect, and the last L × M bitsBits may be padded with arbitrary values. The padding bits may be considered part of the bitmap. In other words, the bitmap may include an indication bit and a padding bit. The indication bits and the padding bits may be as a whole. For example, may belong to one coding block.

It should be understood that the sequential positions of the indication bits and the padding bits illustrated above are only examples, and should not limit the present application in any way. For example, the padding bits may also precede the indication bits.

It should be noted that, in the embodiment of the present application, the padding bits are regarded as a part of the bitmap. The bitmap can be used as an indication field for indicating the positions of the space-frequency vector pairs reported for the R transport layers. For different numbers of transmission layers R, the length of the bitmap is a fixed value, i.e. the length of the indication field is a fixed value. This should not be construed as limiting the application in any way. For example, the indication field may include only the valid bit in the bitmap, and the padding bits may be regarded as a portion other than the indication field. If the padding bits are considered as a part other than the indication field, the bitmap of length lxmx 2 defined above may include the indication field and the padding bits in the case of R ═ 1. In this case, the length of the indication field may be related to the number of transmission layers. For example, in the above design, when R ═ 1, the length of the indicator field may be L × M.

When R ≧ 2, all bits in the bitmap are in effect.

Specifically, when R ═ 2, every lxm bits in the bitmap may correspond to one transport layer, e.g., the first lxm bits in the bitmap correspond to the 1 st transport layer, which may be a sub-bitmap corresponding to the 1 st transport layer; the last lxm bits may correspond to the 2 nd transport layer, and may be a sub-bitmap corresponding to the 2 nd transport layer.

When R ═ 3, the first lxm bits in the bitmap may correspond to the 1 st transport layer, and may be a sub bitmap corresponding to the 1 st transport layer; the middle lxm/2 bits may correspond to the 2 nd transport layer, and may be a sub-bitmap corresponding to the 2 nd transport layer; the last lxm/2 bits may correspond to the 3 rd transport layer and may be a sub-bitmap corresponding to the 3 rd transport layer.

When R ═ 4, every lxm/2 bits in the bitmap correspond to one transport layer, e.g., the first lxm/2 bits in the bitmap may correspond to the 1 st transport layer, may be a sub-bitmap corresponding to the 1 st transport layer; l × M/2 bits after the first L × M/2 bits may correspond to the 2 nd transmission layer, and may be a sub bitmap corresponding to the 2 nd transmission layer; l × M/2 bits after the first L × M bits may correspond to a 3 rd transmission layer, and may be a sub bitmap corresponding to the 3 rd transmission layer; the last lxm/2 bits may correspond to the 4 th transport layer, and may be a sub-bitmap corresponding to the 4 th transport layer.

It should be understood that the above listed correspondence relationship between each bit and the transmission layer is only an example, and should not constitute any limitation to the present application. For example, the transport layers 1 to R may be associated with the bitmap in the order from the back to the front.

Optionally, for R sub-bitmaps in the bitmap, the number L of space vectors_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 2:

TABLE 2

As shown in table 2, when R is 1, the number of reported space-frequency vector pairs is K, that is, the total number of space-frequency vector pairs reported by the terminal device for 1 transport layer is K. The K space-frequency vector pairs may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

When R is 2, the total number of the space-frequency vector pairs reported by the terminal device for 2 transport layers is 2K. And the number of the space-frequency vector pairs reported by each transmission layer is K. The K pairs of space-frequency vectors reported for each transport layer may be selected from L × M pairs of space-frequency vectors determined from L space-frequency vectors and M frequency-domain vectors.

When R is 3, the total number of space-frequency vector pairs reported by the terminal device for 3 transport layers is 2K. The number of the space-frequency vector pairs reported by the 1 st transmission layer is K, and the K space-frequency vector pairs can be selected from L multiplied by M space-frequency vector pairs reported by L space-frequency vectors and M frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 2 nd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L multiplied by M/2 space-frequency vector pairs determined by L space-frequency vectors and M/2 frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 3 rd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L multiplied by M/2 space-frequency vector pairs determined by L space-frequency vectors and M/2 frequency-domain vectors.

It should be understood that the L space vectors corresponding to the 3 transmission layers may be the same or different; the M/2 frequency domain vectors corresponding to the 2 nd transmission layer and the 3 rd transmission layer may be subsets of the M frequency domain vectors corresponding to the 1 st transmission layer, or may not belong to the M frequency domain vectors, and the M/2 frequency domain vectors corresponding to the 2 nd transmission layer and the 3 rd transmission layer may be the same or different. This is not a limitation of the present application.

When R is 4, the total number of space-frequency vector pairs reported by the terminal device for 4 transport layers is 2K. And the number of the space-frequency vector pairs reported by aiming at each transmission layer is K/2. The K/2 space-frequency vector pairs reported for each transport layer may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M/2 frequency-domain vectors.

It should be understood that the L space vectors corresponding to the 4 transmission layers may be the same or different; the M/2 frequency domain vectors corresponding to the 4 transport layers may be the same or different. This is not a limitation of the present application.

Optionally, for R sub-bitmaps in the bitmap, the number L of space vectors_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 3:

TABLE 3

As shown in table 3, when R is 1, the number of reported space-frequency vector pairs is K. That is, the total number of the space-frequency vector pairs reported by the terminal device for 1 transport layer is K. The K space-frequency vector pairs may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

When R is 2, the total number of the space-frequency vector pairs reported by the terminal device for 2 transport layers is K. The number of the space-frequency vector pairs reported by each transmission layer is respectively K/2, and the K/2 space-frequency vector pairs reported by each transmission layer can be selected from L multiplied by M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

And when R is 3, the total number of the space-frequency vector pairs reported by the terminal equipment aiming at the 3 transmission layers is K. The number of the space-frequency vector pairs reported by the 1 st transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L multiplied by M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 2 nd transmission layer is K/4, and the K/4 space-frequency vector pairs can be selected from L multiplied by M/2 space-frequency vector pairs determined by L space-frequency vectors and M/2 frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 3 rd transmission layer is K/4, and the K/4 space-frequency vector pairs can be selected from L multiplied by M/2 space-frequency vector pairs determined by L space-frequency vectors and M/2 frequency-domain vectors.

It should be understood that the L space vectors corresponding to the 3 transmission layers may be the same or different; the M/2 frequency domain vectors corresponding to the 2 nd transmission layer and the 3 rd transmission layer may be a subset of the M frequency domain vectors corresponding to the 1 st transmission layer, or may not belong to the M frequency domain vectors, and the M/2 frequency domain vectors corresponding to the 2 nd transmission layer and the 3 rd transmission layer may be the same or different. This is not a limitation of the present application.

And when R is 4, the total number of the space-frequency vector pairs reported by the terminal equipment aiming at the 4 transmission layers is K. The number of the space-frequency vector pairs reported by each transmission layer is respectively K/4, and the K/4 space-frequency vector pairs can be selected from L multiplied by M/2 space-frequency vector pairs determined by L space-frequency vectors and M/2 frequency-domain vectors.

In yet another possible design, the number of polarization directions of the transmit antennas is 1, and the length of the bitmap may be L × M.

The length of the bitmap is smaller than the bitmap lengths of the first two designs. For any value of R, all bits in the bitmap are in effect, and padding bits are not needed to guarantee the same length. Thus, regardless of how the indication field is defined, in this design, the length of the indication field is also a fixed value.

When R ═ 1, all bits in the bitmap may correspond to one transport layer.

When R ═ 2, the first lxm/2 bits in the bitmap may correspond to the 1 st transport layer, and may be a sub-bitmap corresponding to the 1 st transport layer; the last lxm/2 bits may correspond to the 2 nd transport layer, and may be a sub-bitmap corresponding to the 2 nd transport layer.

When R ═ 3, the first lxm/2 bits in the bitmap may correspond to the 1 st transport layer, and may be a sub-bitmap corresponding to the 1 st transport layer; l × M/4 bits after the first L × M/2 bits may correspond to the 2 nd transmission layer, and may be a sub bitmap corresponding to the 2 nd transmission layer; the last lxm/2 bits may correspond to the 3 rd transport layer and may be a sub-bitmap corresponding to the 3 rd transport layer.

When R ═ 4, every lxm/4 bits in the bitmap correspond to one transport layer, e.g., the first lxm/4 bits in the bitmap may correspond to the 1 st transport layer, may be a sub-bitmap corresponding to the 1 st transport layer; l × M/4 bits after the first L × M/4 bits may correspond to the 2 nd transmission layer, and may be a sub bitmap corresponding to the 2 nd transmission layer; l × M/4 bits after the first L × M/2 bits may correspond to a 3 rd transmission layer, and may be a sub bitmap corresponding to the 3 rd transmission layer; the last lxm/4 bits may correspond to the 4 th transport layer and may be a sub-bitmap corresponding to the 4 th transport layer.

Optionally, for R sub-bitmaps in the bitmap, the number L of space vectors_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 4:

TABLE 4

As shown in table 4, when R is 1, the number of reported space-frequency vector pairs is K, that is, the total number of space-frequency vector pairs reported by the terminal device is K. The K space-frequency vector pairs are selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors.

When R is 2, the total number of the space-frequency vector pairs reported by the terminal device for 2 transport layers is K. And the number of the space-frequency vector pairs reported by each transmission layer is respectively K/2. The K/2 space-frequency vector pairs reported for each transport layer may be selected from L × M/2 space-frequency vector pairs determined by L space-frequency vectors and M/2 frequency-domain vectors.

And when R is 3, the total number of the space-frequency vector pairs reported by the terminal equipment aiming at the 3 transmission layers is K. The number of the space-frequency vector pairs reported aiming at the 1 st transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L space-frequency vector pairs and L multiplied by M/2 space-frequency vector pairs reported by M/2 frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 2 nd transmission layer is K/4, and the K/4 space-frequency vector pairs can be selected from L multiplied by M/4 space-frequency vector pairs determined by L space-frequency vectors and M/4 frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 3 rd transmission layer is K/4, and the K/4 space-frequency vector pairs are selected from L multiplied by M/4 space-frequency vector pairs determined by L space-frequency vectors and M/4 frequency-domain vectors.

It should be understood that the L space vectors corresponding to the 3 transmission layers may be the same or different; the M/4 frequency domain vectors corresponding to the 2 nd and 3 rd transmission layers may be subsets of the M/2 frequency domain vectors corresponding to the 1 st transmission layer, or may not belong to the M/2 frequency domain vectors, and the M/4 frequency domain vectors corresponding to the 2 nd and 3 rd transmission layers may be the same or different. This is not a limitation of the present application.

And when R is 4, the total number of the space-frequency vector pairs reported by the terminal equipment aiming at the 4 transmission layers is K. And the number of the space-frequency vector pairs reported by aiming at each transmission layer is K/4. The K/4 space-frequency vector pairs reported for each transport layer may be selected from L × M/4 space-frequency vector pairs determined by L space-frequency vectors and M/4 frequency-domain vectors.

It should be understood that the L space vectors corresponding to the 4 transmission layers may be the same or different; the M/4 frequency domain vectors corresponding to the 4 transport layers may be the same or different. This is not a limitation of the present application.

The above describes three different design bitmaps in detail by taking the number of polarization directions of the transmitting antenna as 1 as an example for easy understanding, but this should not limit the present application in any way. The bitmap may also be applicable to multiple polarization directions.

In one possible design, the number of polarization directions of the transmit antennas is 2, and the length of the bitmap may be 2 lxmxr_m。

The length of the bitmap is according to a predefined maximum, similar to the case of a number of polarization directions of 1Number of transmission layers R_mTo design. Except that the positions of the selected pairs of space-frequency vectors can be indicated separately for different polarization directions. Thus, when the number of polarization directions is 2, the first 2L × M × R bits in the bitmap take effect for R transport layers.

For the r-th transport layer, the 2L × M × (r-1) +1 bit to the 2L × M × r bit in the bitmap take effect. The partial valid bits are a total of 2 lxm bits. Wherein the first lxm bits may correspond to the first polarization direction and the second lxm bits may correspond to the second polarization direction. Alternatively, the first L × M bits may correspond to the second polarization direction, and the second L × M bits may correspond to the first polarization direction. This is not a limitation of the present application.

As an example, R_mThe length of the bitmap is 2 lxmx 4, 4.

Optionally, for R sub-bitmaps in the bitmap, the number L of space vectors_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 5:

TABLE 5

In Table 5, "L/2L" indicates L or 2L. Due to L for each transport layer shown in Table 5_rThe value of (d) takes into account the space vector of the two polarization directions and thus may be L, and may also be 2L. If two polarization directions share the same L space vectors, then L_rThe value of (d) may be L; if two polarization directions each use L space vectors, then L_rMay be 2L. As mentioned above, the L space vectors in the two polarization directions may be the same or different, and this application does not limit this. That is, L is 2 in the number of polarization directions_rThe value of (b) may be L or 2L, which is not limited in the present application.

As shown in table 5, when R is 1, the number of reported space-frequency vector pairs is K. That is, the total number of the space-frequency vector pairs reported by the terminal device is K. The space-frequency vector pairs reported for the first polarization direction may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the first polarization direction, and the space-frequency vector pairs reported for the second polarization direction may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the second polarization direction.

When R is 2, the total number of the space-frequency vector pairs reported by the terminal device for 2 transport layers is 2K. And the number of the space-frequency vector pairs reported by each transmission layer is K. Wherein the K space-frequency vector pairs reported for each transport layer are selected from 2 lxm space-frequency vector pairs determined by 2L space-frequency vectors and M frequency-domain vectors.

The space-frequency vector pair reported for the first polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the first polarization direction, and the space-frequency vector pair reported for the second polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the second polarization direction. When R is 2, R is 1 or 2.

It should be understood that the 2L spatial vectors corresponding to the 1 st transmission layer and the 2L spatial vectors corresponding to the 2 nd transmission layer may be the same or different; the M frequency domain vectors corresponding to the 1 st transmission layer and the M frequency domain vectors corresponding to the 2 nd transmission layer may be the same or different. This is not a limitation of the present application.

When R is 3, the total number of space-frequency vector pairs reported by the terminal device for 3 transport layers is 2K.

The number of the space-frequency vector pairs reported by the 1 st transmission layer is K, and the K space-frequency vector pairs can be selected from 2L multiplied by M space-frequency vector pairs reported by 2L space-frequency vectors and M frequency-domain vectors; the number of the space-frequency vector pairs reported aiming at the 2 nd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from 2L multiplied by M space-frequency vector pairs determined by 2L space-frequency vectors and M frequency-domain vectors; the number of space-frequency vector pairs reported for the 3 rd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L × M space-frequency vector pairs determined by 2L space-frequency vectors and M frequency-domain vectors.

The space-frequency vector pair reported for the first polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the first polarization direction, and the space-frequency vector pair reported for the second polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the second polarization direction. When R is 3, R is 1, 2 or 3.

When R is 4, the total number of space-frequency vector pairs reported by the terminal device for 3 transport layers is 2K.

And the number of the space-frequency vector pairs reported by aiming at each transmission layer is K/2. The K/2 space-frequency vector pairs reported for each transport layer may be selected from 2L x M space-frequency vector pairs reported from 2L space-frequency vectors and M frequency-domain vectors

The space-frequency vector pair reported for the first polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the first polarization direction, and the space-frequency vector pair reported for the second polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the second polarization direction. When R is 4, R is 1, 2, 3 or 4.

It should be understood that the L space vectors corresponding to the 4 transmission layers may be the same or different; the M frequency domain vectors corresponding to the 3 transport layers may be the same or different. This is not a limitation of the present application.

It should be further understood that, in the above-mentioned cases where R is 1, 2, 3 or 4, the L space vectors corresponding to the first polarization direction and the L space vectors corresponding to the second polarization direction in the same transmission layer may be the same or different, and the present application does not limit this.

To accommodate the greater number of possible polarization directions, the length of the bitmap can be more generally expressed as P L M R_m. P represents the number of polarization directions, and P is an integer of 1 or more.

In another possible design, the number of polarization directions of the transmit antennas is 2, and the length of the bitmap may be 2L × M × 2.

The bitmap length of this design is smaller than that of the former design, similar to the case where the number of polarization directions is 1. Except that the positions of the selected pairs of space-frequency vectors can be indicated separately for different polarization directions. Thus, when R < 2, such as R ═ 1, 2 lxm bits in the bitmap take effect, and the last 2 lxm bits can be filled with arbitrary values. The padding bits may be considered part of the bitmap. In other words, the bitmap may include an indication bit and a padding bit. The indication bits and the padding bits may belong as a whole, e.g. to one coding block.

It should be noted that, in the embodiment of the present application, the padding bits are regarded as a part of the bitmap. The bitmap can be used as an indication field for indicating the positions of the space-frequency vector pairs reported for the R transport layers. For different numbers of transmission layers R, the length of the bitmap is a fixed value, i.e. the length of the indication field is a fixed value. This should not be construed as limiting the application in any way. For example, the indication field may include only the valid bit in the bitmap, and the padding bits may be regarded as a portion other than the indication field. If the padding bits are considered as a part other than the indication field, the bitmap having a length of 2 lxmx 2 as defined above may include the indication field and the padding bits in the case where R ═ 1. In this case, the length of the indication field may be related to the number of transmission layers. For example, in the above design, when R ═ 1, the length of the indicator field may be 2L × M.

When R ≧ 2, all bits in the bitmap are in effect.

Specifically, when R ═ 2, every 2 lxm bits in the bitmap may correspond to one transport layer, e.g., the first 2 lxm bits in the bitmap correspond to the 1 st transport layer, which may be a sub-bitmap corresponding to the 1 st transport layer; the last 2 lxm bits may correspond to the 2 nd transport layer, and may be a sub-bitmap corresponding to the 2 nd transport layer.

When R ═ 3, the first 2 lxm bits in the bitmap may correspond to the 1 st transport layer, may be a sub-bitmap corresponding to the 1 st transport layer; the middle 2 lxm/2 (i.e., lxm) bits may correspond to the 2 nd transport layer, may be a sub-bitmap corresponding to the 2 nd transport layer; the last 2 lxm/2 (i.e., lxm) bits may correspond to the 3 rd transport layer, and may be a sub-bitmap corresponding to the 3 rd transport layer.

When R ═ 4, every 2 lxm/2 (i.e., lxm) bits in the bitmap correspond to one transport layer, e.g., the first lxm bits in the bitmap may correspond to the 1 st transport layer, may be a sub-bitmap corresponding to the 1 st transport layer; the lxm bits after the first lxm bits may correspond to the 2 nd transport layer, and may be a sub bitmap corresponding to the 2 nd transport layer; l × M bits following the first 2L × M bits may correspond to a 3 rd transmission layer, and may be a sub bitmap corresponding to the 3 rd transmission layer; the last lxm bits may correspond to the 4 th transport layer, and may be a sub-bitmap corresponding to the 4 th transport layer.

Also, in the sub-bitmap corresponding to the r-th transport layer, the first half bits (e.g., 1/2 bits of the bit length of the sub-bitmap) may correspond to a first polarization direction, and the second half bits may correspond to a second polarization direction; alternatively, the first half bits may correspond to the second polarization direction and the second half bits may correspond to the first polarization direction. This is not a limitation of the present application.

It should be understood that the above listed correspondence between each bit and the transmission layer and between each bit and the polarization direction are only examples, and should not limit the present application in any way. For example, the transport layers 1 to R may be associated with the bitmap in the order from the back to the front.

Optionally, for R sub-bitmaps in the bitmap, a space vectorNumber L of_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 6:

TABLE 6

In Table 6, "L/2L" indicates L or 2L. Due to L for each transport layer shown in Table 6_rThe value of (d) takes into account the space vector of the two polarization directions and thus may be L, and may also be 2L. If two polarization directions share the same L space vectors, then L_rThe value of (d) may be L; if two polarization directions each use L space vectors, then L _rMay be 2L. As mentioned above, the L space vectors in the two polarization directions may be the same or different, and this application does not limit this. That is, L is 2 in the number of polarization directions_rThe value of (b) may be L or 2L, which is not limited in the present application.

As shown in table 6, when R is 1, the number of reported space-frequency vector pairs is K. That is, the total number of the space-frequency vector pairs reported by the terminal device for 1 transport layer is K. The K space-frequency vector pairs may be selected from 2L × M space-frequency vector pairs determined by 2L space-frequency vectors and M frequency-domain vectors. The space-frequency vector pairs reported for the first polarization direction may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-frequency vectors corresponding to the first polarization direction.

When R is 2, the total number of the space-frequency vector pairs reported by the terminal device for 2 transport layers is 2K. And the number of the space-frequency vector pairs reported by each transmission layer is K. The K pairs of space-frequency vectors reported for each transport layer may be selected from 2 lxm pairs of space-frequency vectors determined from 2L space-frequency vectors and M frequency-domain vectors.

When R is 3, the total number of space-frequency vector pairs reported by the terminal device for 3 transport layers is 2K. The number of the space-frequency vector pairs reported for the 1 st transport layer is K, and the K space-frequency vector pairs may be selected from 2 lxm space-frequency vector pairs reported by 2L space-frequency vectors and M frequency-domain vectors. And the space-frequency vector pair reported for the first polarization direction on the 1 st transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the first polarization direction, and the space-frequency vector pair reported for the second polarization direction on the 1 st transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the second polarization direction.

The number of the space-frequency vector pairs reported for the 2 nd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L × M space-frequency vector pairs determined by 2L space-frequency vectors and M/2 frequency-domain vectors. And the space-frequency vector pair reported for the first polarization direction on the 2 nd transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/2 frequency-domain vectors, and the space-frequency vector pair reported for the second polarization direction on the 2 nd transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/2 space-frequency vector pairs determined by M/2 frequency-domain vectors.

The number of the space-frequency vector pairs reported for the 3 rd transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from L multiplied by M space-frequency vector pairs determined by 2L space-frequency vectors and M/2 frequency-domain vectors. And the space-frequency vector pair reported for the first polarization direction on the 3 rd transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/2 frequency-domain vectors, and the space-frequency vector pair reported for the second polarization direction on the 3 rd transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/2 space-frequency vector pairs determined by M/2 frequency-domain vectors.

When R is 4, the total number of space-frequency vector pairs reported by the terminal device for 4 transport layers is 2K. And the number of the space-frequency vector pairs reported by aiming at each transmission layer is K/2. The K/2 space-frequency vector pairs reported for each transport layer may be selected from L × M space-frequency vector pairs determined by 2L space-frequency vectors and M/2 frequency-domain vectors.

The space-frequency vector pairs reported for the first polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/2 frequency-domain vectors, and the space-frequency vector pairs reported for the second polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/2 space-frequency vector pairs determined by M/2 frequency-domain vectors. When R is 4, R is 1, 2, 3 or 4.

It should be further understood that, in the case where R is 1, 2, 3, or 4, the L space vectors corresponding to the first polarization direction and the L space vectors corresponding to the second polarization direction on the same transmission layer may be the same or different, and the present application does not limit this.

Optionally, for R sub-bitmaps in the bitmap, the number L of space vectors_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 7:

TABLE 7

In Table 7, "L/2L" indicates L or 2L. Due to L for each transport layer shown in Table 7 _rThe value of (d) takes into account the space vector of the two polarization directions and thus may be L, and may also be 2L. If two polarization directions share the same L space vectors, then L_rThe value of (d) may be L; if two polarization directions each use L space vectors, then L_rMay be 2L. As mentioned above, the L space vectors in the two polarization directions may be the same or different, and this application does not limit this. That is, L is 2 in the number of polarization directions_rThe value of (b) may be L or 2L, which is not limited in the present application.

As shown in table 7, when R is 1, the number of reported space-frequency vector pairs is K. That is, the total number of the space-frequency vector pairs reported by the terminal device for 1 transport layer is K. The K space-frequency vector pairs may be selected from 2L × M space-frequency vector pairs determined by 2L space-frequency vectors and M frequency-domain vectors. The space-frequency vector pairs reported for the first polarization direction may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the first polarization direction, and the space-frequency vector pairs reported for the second polarization direction may be selected from L × M space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the second polarization direction.

And when R is 3, the total number of the space-frequency vector pairs reported by the terminal equipment aiming at the 3 transmission layers is K. The number of the space-frequency vector pairs reported for the 1 st transmission layer is K/2, and the K/2 space-frequency vector pairs can be selected from 2 lxm space-frequency vector pairs determined by 2L space-frequency vectors and M frequency-domain vectors. And the space-frequency vector pair reported for the first polarization direction of the 1 st transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the first polarization direction, and the space-frequency vector pair reported for the second polarization direction of the 1 st transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors and M frequency-domain vectors corresponding to the second polarization direction.

The number of space-frequency vector pairs reported for the 2 nd transport layer is K/4, and the K/4 space-frequency vector pairs may be selected from 2 lxm/2 (i.e., lxm) space-frequency vector pairs determined by 2L space-frequency vectors and M/2 frequency-domain vectors. And the space-frequency vector pair reported for the first polarization direction of the 2 nd transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/2 frequency-domain vectors, and the space-frequency vector pair reported for the second polarization direction of the 2 nd transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/2 space-frequency vector pairs determined by M/2 frequency-domain vectors.

The number of space-frequency vector pairs reported for the 3 rd transmission layer is K/4, and the K/4 space-frequency vector pairs may be selected from 2 lxm/2 (i.e., lxm) space-frequency vector pairs determined by 2L space-frequency vectors and M/2 frequency-domain vectors. And the space-frequency vector pair reported for the first polarization direction of the 3 rd transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/2 frequency-domain vectors, and the space-frequency vector pair reported for the second polarization direction of the 3 rd transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/2 space-frequency vector pairs determined by M/2 frequency-domain vectors.

To accommodate the greater number of possible polarization directions, the length of the bitmap can be more generally expressed as P × L × M × 2.

In yet another possible design, the number of polarization directions of the transmit antennas is 2, and the length of the bitmap may be 2L × M.

The length of the bitmap is smaller than that of the first two designs, similar to the case where the number of polarization directions of the transmit antennas is 1. For any value of R, all bits in the bitmap are valid, so no padding bits are needed. Thus, regardless of how the indication field is defined, in this design, the length of the indication field is also a fixed value.

When R ═ 1, all bits in the bitmap may correspond to one transport layer.

When R ═ 2, the first 2 lxm/2 (i.e., lxm) bits in the bitmap may correspond to the 1 st transport layer, may be a sub-bitmap corresponding to the 1 st transport layer; the last 2 lxm/2 (i.e., lxm) bits may correspond to the 2 nd transport layer, and may be a sub-bitmap corresponding to the 2 nd transport layer.

When R ═ 3, the first 2 lxm/2 (i.e., lxm) bits in the bitmap may correspond to the 1 st transport layer, may be a sub-bitmap corresponding to the 1 st transport layer; 2 lxm/4 (i.e., lxm/2) bits after the first lxm bits may correspond to the 2 nd transport layer, may be a sub-bitmap corresponding to the 2 nd transport layer; the last 2 lxm/4 (i.e., lxm/2) bits may correspond to the 3 rd transport layer, and may be a sub-bitmap corresponding to the 3 rd transport layer.

When R ═ 4, every lxm/4 bits in the bitmap correspond to one transport layer, e.g., the first 2 lxm/4 (i.e., lxm/2) bits in the bitmap may correspond to the 1 st transport layer, may be a sub-bitmap corresponding to the 1 st transport layer; 2 lxm/4 (i.e., lxm/2) bits after the first lxm/2 bits may correspond to the 2 nd transport layer, and may be a sub-bitmap corresponding to the 2 nd transport layer; 2 lxm/4 (i.e., lxm/2) bits after the first lxm bits may correspond to the 3 rd transport layer, may be a sub-bitmap corresponding to the 3 rd transport layer; the last 2 lxm/4 (i.e., lxm/2) bits may correspond to the 4 th transport layer, and may be a sub-bitmap corresponding to the 4 th transport layer.

Optionally, for R sub-bitmaps in the bitmap, the number L of space vectors_rFrequency domain vector number M_rNumber of sum space-frequency vector pairs K_rCan be configured as shown in table 8:

TABLE 8

In Table 8, "L/2L" indicates L or 2L. Due to L for each transport layer shown in Table 8 _rThe value of (d) takes into account the space vector of the two polarization directions and thus may be L, and may also be 2L. If two polarization directions share the same L space vectors, then L_rThe value of (d) may be L; if two polarization directions each use L space vectors, then L_rMay be 2L. As mentioned above, the L space vectors in the two polarization directions may be the same or different, and this application does not limit this. That is, L is 2 in the number of polarization directions_rThe value of (b) may be L or 2L, which is not limited in the present application.

As shown in table 8, when R is 1, the number of reported space-frequency vector pairs is K, that is, the total number of space-frequency vector pairs reported by the terminal device is K. The K space-frequency vector pairs are selected from 2L × M space-frequency vector pairs determined by 2L space-frequency vectors and M frequency-domain vectors. The space-frequency vector pairs reported for the first polarization direction may be selected from L × M space-frequency vector pairs determined by L space vectors and M frequency domain vectors corresponding to the first polarization direction, and the space-frequency vector pairs reported for the second polarization direction may be selected from L × M space-frequency vector pairs determined by L space vectors and M frequency domain vectors corresponding to the second polarization direction.

When R is 2, the total number of the space-frequency vector pairs reported by the terminal device for 2 transport layers is K. And the number of the space-frequency vector pairs reported by each transmission layer is respectively K/2. The K/2 space-frequency vector pairs reported for each transport layer may be selected from 2 lxm/2 (i.e., lxm) space-frequency vector pairs determined from 2L space-frequency vectors and M/2 frequency-domain vectors.

The space-frequency vector pairs reported for the first polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/2 frequency-domain vectors, and the space-frequency vector pairs reported for the second polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/2 space-frequency vector pairs determined by M/2 frequency-domain vectors. When R is 2, R is 1 or 2.

And when R is 3, the total number of the space-frequency vector pairs reported by the terminal equipment aiming at the 3 transmission layers is K. The number of the space-frequency vector pairs reported for the 1 st transmission layer is K/2, and the K/2 space-frequency vector pairs may be selected from 2 lxm/2 (i.e., lxm) space-frequency vector pairs reported by 2L space-frequency vectors and M/2 frequency-domain vectors. The space-frequency vector pairs reported for the first polarization direction on the 1 st transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/2 frequency-domain vectors, and the space-frequency vector pairs reported for the second polarization direction on the 1 st transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/2 space-frequency vector pairs determined by M/2 frequency-domain vectors.

The number of the space-frequency vector pairs reported aiming at the 2 nd transmission layer is K/4, and the K/4 space-frequency vector pairs can be selected from L multiplied by M/4 space-frequency vector pairs determined by L space-frequency vectors and M/4 frequency-domain vectors. The space-frequency vector pairs reported for the first polarization direction on the 2 nd transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/4 frequency-domain vectors, and the space-frequency vector pairs reported for the second polarization direction on the 2 nd transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/4 space-frequency vector pairs determined by M/4 frequency-domain vectors.

The number of the space-frequency vector pairs reported aiming at the 3 rd transmission layer is K/4, and the K/4 space-frequency vector pairs are selected from L multiplied by M/4 space-frequency vector pairs determined by L space-frequency vectors and M/4 frequency-domain vectors. The space-frequency vector pairs reported for the first polarization direction on the 3 rd transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/4 frequency-domain vectors, and the space-frequency vector pairs reported for the second polarization direction on the 3 rd transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/4 space-frequency vector pairs determined by M/4 frequency-domain vectors.

The space-frequency vector pairs reported for the first polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs determined by L space-frequency vectors corresponding to the first polarization direction and M/4 frequency-domain vectors, and the space-frequency vector pairs reported for the second polarization direction on the r-th transmission layer may be selected from L space-frequency vector pairs corresponding to the second polarization direction and L × M/4 space-frequency vector pairs determined by M/4 frequency-domain vectors. When R is 4, R is 1, 2, 3 or 4.

To accommodate the greater number of possible polarization directions, the length of the bitmap can be more generally expressed as P × L × M.

Several possible designs of the bitmap provided by the embodiments of the present application are described in detail above with reference to tables 1 to 8, but this should not be construed as limiting the present application in any way. For example, when the number of polarization directions of the transmission antennas is 1, the length of the bitmap can also be designed to be L × M × R_m2; when the number of polarization directions of the transmit antennas is 2, the length of the bitmap can also be designed to be 2L × M × R_m/2 (i.e., LxMxR_m). The corresponding relationship between each bit in the bitmap and each transport layer can be determined by referring to the corresponding relationship listed above, and for the sake of brevity, a description thereof is not listed one by one.

It should also be understood that when the protocol definition employs one of the designs listed above for the bitmap, the terminal device may generate the bitmap based on the defined design, and the network device may parse the bitmap based on the corresponding design.

It should also be understood that the above-listed calculation of the bitmap length may vary when L and M are defined differently. The calculation of the bitmap length determined by those skilled in the art based on the same inventive concept is intended to fall within the scope of the present application.

Optionally, the bitmap is located in the first part of the CSI report.

As mentioned before, the length of the first part of the CSI report is predefined. Since the length of the bitmap can be a fixed value regardless of the number R of transmission layers. Thus, the bitmap may be designed in the first part of the CSI report. The overhead of the first part of the CSI report may be fixed and not varied with the number of transmission layers R. A protocol may predefine the overhead of the first portion to facilitate a network device decoding the first portion based on a predefined length after receiving the CSI report.

Optionally, the CSI report further comprises a second part comprising an indication of the weighting coefficients reported for each of the R transport layers.

For example, for the r-th transmission layer, the CSI report may be used to indicate T_rA weighting factor.

Since the number of space-frequency vector pairs reported for each transport layer is indicated by a bitmap in the first part, and the number of quantization bits of each weighting coefficient can be predetermined, the indication overhead of the weighting coefficient reported for each of the R transport layers in the second part can be determined.

Taking the r-th transmission layer as an example, the number of the weighting coefficients reported by the terminal equipment is T_rIf the number of quantization bits of the amplitude of each weighting coefficient is x and the number of quantization bits of the phase is y, the indication overhead of the weighting coefficient reported by the r-th transport layer may be (x + y) × T, for example_rAnd (4) a bit. The indicated overhead for the weighting coefficients reported by the R transport layers may be, for example, the overhead of the weighting coefficients reported by the R transport layers

And (4) a bit.

As described above, since the weighting coefficients correspond to the space-frequency vector pairs, the CSI report indicates the number and the position of the space-frequency vector pairs reported for each transport layer through the bitmap, and also indicates the number and the position of the weighting coefficients reported for each transport layer.

The terminal device may indicate the weighting coefficients in a normalized manner, for example, or may indicate one or more weighting coefficients corresponding to the space-frequency vector pair by a quantized value or an index of a quantized value, respectively.

If the terminal device indicates the weighting coefficient by using the normalization method, the maximum coefficient can be determined in a predetermined normalization range, and the maximum coefficient is normalized. The relative value of the other coefficients with respect to the largest coefficient may then be indicated by the quantized value or an index of the quantized value. If the terminal device uses a normalization method to indicate the weighting coefficients, the positions of the normalization coefficients may be further indicated in the second part.

It should be understood that the above-mentioned normalization may be performed in different ranges by determining the maximum weighting coefficient in units of each polarization direction, each transmission layer, or all transmission layers.

It should also be understood that the specific method of indicating the weighting coefficients by way of normalization may refer to the prior art, and a detailed description of the specific process is omitted here for the sake of brevity.

If the terminal device indicates the weighting coefficients corresponding to the space-frequency vector pairs by using the quantized values or the indexes of the quantized values, the weighting coefficients may be indicated in a predetermined order. For example, the terminal device may sequentially indicate the corresponding weighting coefficients according to the order of the reported space-frequency vector pairs in the bitmap.

Further, when the number of the weighting coefficients reported for the same transport layer is multiple, the weighting coefficients corresponding to the same transport layer may belong to at least two quantization levels. The at least two quantization levels include a first quantization level and a second quantization level, and the number of quantization bits of the weighting coefficients corresponding to the first quantization level is greater than the number of quantization bits of the weighting coefficients corresponding to the second quantization level.

The number of quantization levels and the division rule may be predefined, such as protocol definition.

In one implementation, the plurality of quantization levels may be divided according to a quantization value of the amplitude. In other words, different quantization levels may correspond to different magnitudes of quantized values. Table 9 shows an example of the quantization level-amplitude quantization value correspondence. As shown in fig. 9, 4 quantization levels may be divided based on the quantization value of the magnitude of the weighting coefficient.

TABLE 9

Alternatively, the number of quantization bits of the phase coefficient in the weighting coefficient corresponding to the first quantization level is larger than the number of quantization bits of the phase coefficient in the weighting coefficient corresponding to the second quantization level. Table 10 shows an example of the correspondence relationship between the quantization level and the quantization value of the amplitude and the quantization bit of the phase.

Watch 10

Of course, the corresponding relationship between different quantization levels and the quantization bit number of the amplitude may be further defined, and for the sake of brevity, this is not illustrated one by one.

The indication overhead of the weighting coefficient reported for each transport layer can be determined based on the quantization bit number of the amplitude and the quantization bit number of the phase corresponding to different quantization levels and the number of the weighting coefficients corresponding to each quantization level. For the sake of brevity, no further illustration is provided here.

It should be understood that the above listed correspondence between the number of quantization levels and the quantization values of the quantization levels and the amplitudes and the quantization bits of the phases is only an example for easy understanding, and should not constitute any limitation to the present application. The present application is not limited to the number of quantization levels and the correspondence between the quantization levels and the quantization values of the amplitudes and the quantization bits of the phases.

In another implementation, the plurality of quantization levels may be divided according to the quantization value of the amplitude and the number of weighting coefficients. For example, if the number of quantization levels is predefined to be 2, a part of the weighting coefficients reported for each transport layer with a larger amplitude quantization value may be classified as a first quantization level, and a part of the weighting coefficients reported for each transport layer with a smaller amplitude quantization value may be classified as a second quantization level.

For example, the number of weighting coefficients reported for the r-th transport layer is T_r. T in which the quantized value of the amplitude is large can be set_rThe/2 weighting coefficients are classified into a first quantization level and quantized through the quantization bit number of the first quantization level; t in which the quantized value of the amplitude is small can be set_rThe/2 weighting coefficients are grouped into a second quantization level and quantized by the number of quantization bits corresponding to the second quantization level.

It should be understood that the above-listed methods for dividing the quantization levels are only two possible implementations, and should not limit the present application in any way. The number of quantization levels and the division rule of the quantization levels are not limited in the present application.

Optionally, the second portion of the CSI report further comprises an indication of the spatial vector reported for each of the R transport layers.

For example, for the r-th transmission layer, the CSI report may be used to indicate L_rA spatial vector.

The number of the space-domain vectors reported for each transport layer may be predefined or may be directly or indirectly indicated by the network device through signaling. This is not a limitation of the present application.

Optionally, the method further comprises: and the terminal equipment receives second indication information, wherein the second indication information is used for indicating the reporting number of the space vector configured for each transmission layer. Accordingly, the network device transmits the second indication information.

The network device may carry the second indication information through a higher layer signaling, such as an RRC message or an MAC CE, or a physical layer signaling, such as DCI, for example, so as to indicate the reporting number of the space vector configured for each transport layer to the terminal device. The application is not limited to the specific signaling carrying the second indication information.

In one possible design, the second indication information may indicate a maximum value L of the reported number of space vectors configured for each of the R transport layers. Wherein the maximum value L may be replaced with a minimum value, an average value, or the like. The network terminal device may determine, based on a predefined rule, the number of reports of the space vector for each transmission layer according to the value indicated by the second indication information and the number of transmission layers. In this case, the second indication information indirectly indicates the number of reports of the space vector configured for each transport layer.

In another possible design, the second indication information may directly indicate the number of the space domain vectors configured for each transmission layer when R is a different value, and the terminal device and the network device may directly determine the number of the space domain vectors that need to be reported for each transmission layer according to the second indication information and the number of transmission layers. It can be understood that, when the values indicated by the second indication information have different meanings, the predefined rule for determining the number of reports corresponding to each transport layer is different, and the above-listed calculation formula of the bitmap length is also changed accordingly.

In addition, the number of reports of the space vector for each transport layer may also be predefined, such as protocol definition. For example, the protocol may predefine the number of reports of the space vector configured for each transport layer when R is different. Alternatively, the maximum value L may be predefined. This is not a limitation of the present application.

It is to be understood that the number of transmission layers may be determined by the terminal device, e.g., the terminal device may be determined based on downlink channel measurements. The specific method for determining the number of transmission layers by the terminal device may refer to the prior art, and a detailed description of the specific process is omitted here for brevity.

In this embodiment of the present application, optionally, the number of the spatial vectors configured for each of the R transmission layers is the same, for example, all are L.

After the number of the space vectors to be reported for each transport layer is determined, the indication overhead for indicating the space vectors can be determined. For example, when the spatial vector reported for each transport layer is selected from a set of spatial vectors, the indicated overhead for indicating the spatial vector for each transport layer may be, for example, the indicated overhead

Wherein N is_sThe number of space vectors in a space vector set or a certain orthogonal group in the space vector set is represented.

Optionally, the second part of the CSI report further comprises an indication of a frequency domain vector reported for each of the R transport layers.

For example, for the r-th transmission layer, the CSI report may be used to indicate M_rA frequency domain vector.

The number of frequency domain vectors reported for each transport layer may be predefined or indicated directly or indirectly by the network device through signaling. This is not a limitation of the present application.

Optionally, the method further comprises: and the terminal equipment receives third indication information, wherein the third indication information is used for indicating the reporting number of the frequency domain vectors configured for each transmission layer. Accordingly, the network device transmits the third indication information.

The network device may carry the third indication information through a higher layer signaling, such as an RRC message or an MAC CE, or a physical layer signaling, such as DCI, for example, so as to indicate the reporting number of the frequency domain vectors configured for each transport layer to the terminal device. The application does not limit the specific signaling carrying the third indication information.

In one possible design, the third indication information may indicate a maximum value M of reported numbers of frequency domain vectors configured for each of the R transport layers. Wherein the maximum value M may be replaced by a minimum value, an average value, or the like. The terminal device may determine, based on a predefined rule, the number of reports corresponding to each transport layer according to the value indicated by the third indication information and the number of transport layers. In this case, the third indication information indirectly indicates the number of reported frequency domain vectors configured for each transport layer.

Take the third indication information indicating the maximum value M as an example. The predefined rule may be, for example: when R is 1, the reporting number M of the frequency domain vectors configured for one transmission layer₁Is the maximum value M; when R is 2, the reporting number M of the frequency domain vectors configured for the two transmission layers₁And M₂Is the maximum value M, or is half M/2 of the maximum value; when R is 3, the reporting number M of the frequency domain vectors configured for the 1 st transmission layer₁The maximum value M is the reporting number M of the frequency domain vectors configured for the 2 nd and the 3 rd transmission layers₂And M₃Half M/2 of the maximum value; when R is 4, the reporting number M of the frequency domain vectors configured aiming at the four transmission layers₁To M₄Are all half M/2 of the maximum.

It should be understood that the above-listed rules are only examples and should not constitute any limitation to the present application. The relationship between the reported number of frequency domain vectors configured for each transmission layer and the maximum value has been described in detail with reference to specific embodiments. For brevity, they are not illustrated one by one here. It can be understood that, when the values indicated by the third indication information have different meanings, the predefined rule for determining the number of reported frequency domain vectors corresponding to each transport layer is also different, and the above-listed calculation formula of the bitmap length is also changed accordingly.

In another possible design, the third indication information may directly indicate the number of frequency domain vectors configured for each transmission layer when R is a different value, and the terminal device may directly determine the number of frequency domain vectors that need to be reported for each transmission layer according to the third indication information and the number of transmission layers.

In yet another possible design, the third indication may be the same indication as the second indication described above. For example, a relationship between the number of reports of frequency domain vectors and the number of reports of spatial domain vectors configured for each transport layer may be predefined. That is, the number of reports of the frequency domain vectors and the number of reports of the space domain vectors may have a corresponding relationship. For example, when the number of reported null domain vectors is 4, the number of reported frequency domain vectors is 4; and when the reported number of the space domain vectors is 8, the reported number of the frequency domain vectors is 6, and the like. It should be understood that this is by way of example only for ease of understanding and should not be construed as limiting this application in any way. The reporting number of the space domain vectors, the reporting number of the frequency domain vectors and the relationship between the space domain vectors and the frequency domain vectors are not limited. In addition, the correspondence between the number of reported space-domain vectors and the number of reported frequency-domain vectors is not limited to one-to-one correspondence. In this case, the second indication information indirectly indicates the number of reports of the frequency domain vectors configured for each transport layer.

In addition, the number of reports of the frequency domain vectors configured for each transport layer may also be predefined, for example, defined by a protocol. For example, the protocol may predefine the number of reports of the frequency domain vectors configured for each transport layer when R is different. Alternatively, the maximum value L may be predefined. This is not a limitation of the present application.

After the number of frequency domain vectors to be reported for each transport layer is determined, the indication overhead for indicating the frequency domain vectors can be determined. For example, when the frequency domain vector reported for each transport layer is selected from a set of frequency domain vectors, the indication overhead for indicating the frequency domain vector for each transport layer may be, for example, the overhead of the indication for each transport layer

Wherein N is_fThe number of space-domain vectors in a frequency-domain vector set or a certain orthogonal group in the frequency-domain vector set is represented.

It should be understood that the first indication information, the second indication information, and the third indication information mentioned above may be carried by the same signaling, or may be carried by different signaling, and this application is not limited thereto. In addition, the first indication information, the second indication information, and the third indication information may be combined into one indication information or two indication information in some cases, which is not limited in the present application.

The space vector and the frequency domain vector used for constructing the precoding vector reported for each transmission layer may be determined by the terminal device based on downlink channel measurement, for example.

Specifically, the space vector and the frequency domain vector used for constructing the precoding vector may specifically refer to a space vector and a frequency domain vector included in a space-frequency vector pair reported by the terminal device. The spatial vector used to construct the precoding vector may be selected from a set of predefined spatial vectors and the frequency domain vector used to construct the precoding vector may be selected from a set of predefined frequency domain vectors.

Taking the r-th transport layer as an example, T reported by the terminal device_rThe space-frequency vector included in each space-frequency vector pair may be selected from L_rA space vector of L_rThe spatial vectors may be determined from a predefined set of spatial vectors. T reported by terminal equipment_rThe frequency domain vector contained by each space-frequency vector pair may be selected from M_rA frequency domain vector, the M_rThe individual frequency domain vectors may also be determined from a predefined set of frequency domain vectors. L above_rA space vector sum M_rThe frequency domain vectors may be predefined, or determined and reported to the network device by the terminal device based on the downlink channel measurement.

When the above-mentioned L is present_rA space vector sum M_rWhen the individual frequency domain vector is determined by the terminal device based on the downlink channel measurement, the L is_rA space vector sum M_rThe frequency domain vectors may be determined based on precoding vectors corresponding to the frequency domain elements on the r-th transmission layer, for example. Here, the precoding vector corresponding to each frequency domain unit on the r-th transmission layer may be determined based on a channel matrix measured on each frequency domain unit. The precoding vectors corresponding to each frequency domain unit on the r-th transmission layer can be constructed andand the space-frequency matrix corresponding to the r-th transmission layer. L above_rA space vector sum M_rThe frequency domain vector may be, for example, a spatial domain and a frequency domain DFT determination of a space-frequency matrix corresponding to the r-th transmission layer.

For example, the space-frequency matrix constructed by the precoding vectors corresponding to the frequency domain units on the r-th transmission layer can be denoted as H_r. From a predefined set of spatial vectors, a matrix U can be constructed_sFrom a predefined set of frequency domain vectors, a matrix U can be constructed_fThen, the DFT of the space-frequency matrix in the space domain and the frequency domain can be obtained by the following formula: c ═ U_s ^HH_rU_f. Where C denotes a coefficient matrix obtained by DFT.

The terminal equipment can determine the stronger L from the coefficient matrix C _rSum of lines and stronger M_rAnd (4) columns. For example, the network device may determine the larger L of the modulo sum of squares based on the modulo sum of the size of each row element in the coefficient matrix C_rA row, and M with larger square sum of modulus can be determined according to the square sum of modulus of each column element in the coefficient matrix C_rAnd (4) columns. Therefore, L reported for the r transport layer can be determined based on the space-frequency matrix corresponding to the r transport layer_rA space vector sum M_rA frequency domain vector.

The terminal equipment can further select the stronger L_rSum of lines and stronger M_rDetermining the modulo-larger K of a column_rElement to determine the stronger K_rA pair of space-frequency vectors. If the terminal equipment is from the stronger L_rSum of lines and stronger M_rIn a column, the larger K of the modulus can be determined_rA nonzero element, the number T of space-frequency vector pairs reported by the terminal equipment aiming at the r-th transmission layer_rThe reporting number K can be matched with the pre-configuration_rThe same; if the terminal equipment is from the stronger L_rSum of lines and stronger M_rThe number of the non-zero elements which can be determined in each column is less than K_rIf the number of the space-frequency vector pairs reported by the terminal device for the r-th transmission layer is T_rCan be less than the pre-configured number of reports K_r。

Furthermore, L selected in the coefficient matrix C _rA row and M_rEach column may construct a new coefficient matrix C', which may be of dimension L_r×M_rOf the matrix of (a). Selected T in the coefficient matrix C_rThe position of the element and the selected T_rA space-frequency vector pair is in L_rA space vector sum M_rL determined by a frequency domain vector_r×M_rThe positions in the pairs of space frequency vectors correspond. Selected T in the coefficient matrix C_rEach element is corresponding T_rWeighting coefficients of the pairs of space-frequency vectors.

When R transmission layers share L space vectors or M frequency domain vectors, the terminal device may determine L space vectors or M frequency domain vectors according to the space-frequency matrix corresponding to each transmission layer. The specific method may be similar to that described above, and for brevity, will not be described again here.

It should be understood that the specific method for determining the precoding matrix based on the channel matrix may refer to the prior art, and a detailed description of the specific process is omitted here for brevity.

It should also be understood that the determination of L by the terminal device is described in detail above with respect to the r-th transport layer only for ease of understanding_rSpace vector, M_rVector of frequency domain, T_rThe specific process of the space-frequency vector pair and the corresponding weighting coefficient. This should not be construed as limiting the application in any way. The specific method for the terminal device to determine the space-domain vector, the frequency-domain vector, the space-frequency vector pair, and the corresponding weighting coefficient for each transmission layer is not limited to the above. The terminal device may also determine a space-domain vector, a frequency-domain vector, a space-frequency vector pair, and a corresponding weighting coefficient for each transmission layer by using an existing estimation method, such as a multiple signal classification algorithm (MUSIC), a Bartlett (Bartlett) algorithm, or a rotation invariant subspace algorithm (ESPRIT).

When the terminal equipment reports the space domain vector and the frequency domain vector aiming at each transmission layerThe spatial and frequency domain vectors selected for each transmission layer may be combined pairwise to obtain a plurality of spatial vector pairs. E.g., L selected for the r-th transport layer_rA space vector sum M_rThe frequency domain vectors can be combined to obtain L_r×M_rA pair of space-frequency vectors. However, this is only one possible implementation and should not be construed as limiting the present application in any way.

As an embodiment, when reporting the spatial vector and the frequency domain vector for each transmission layer, the terminal device may also report one or more corresponding frequency domain vectors based on each spatial vector. After the space domain vectors reported for each transmission layer are determined, the number of the frequency domain vectors to be reported can be determined according to the strength of each space domain vector.

Taking the r-th transmission layer as an example, the terminal device may determine L first_rA spatial vector. The L is_rThe spatial vectors may be determined, for example, by the DFT described above. The L is_rThe individual space-domain vectors may correspond to the stronger L in the coefficient matrix C obtained via DFT_rAnd (4) a row. Based on the L_rThe magnitude of the coefficient of each space domain vector can further determine the number of the frequency domain vectors reported for each space domain vector. Wherein, the L _rThe magnitude of the coefficients of the spatial vectors may be determined by the stronger L in the coefficient matrix C_rThe sum of the squares of the modes of the elements of each row in a row is determined.

In one possible design, the L_rThe spatial vectors may be divided into two groups, where the first group of spatial vectors may include L_r1A second set of spatial vectors, which may include L_r2A spatial vector. L is_r1≥1，L_r2≥1，L_r＝L_r1+L_r2And L is_r1And L_r2Are all integers. The first set of spatial vectors and the second set of spatial vectors may be divided by a predetermined rule, such as, for example, based on magnitude. Specifically, the average magnitude of the coefficients of the first set of spatial vectors is greater than the average magnitude of the coefficients of the second set of spatial vectors, or the sum of the squares of the coefficients of the first set of spatial vectors is greater than the sum of the squares of the coefficients of the second set of spatial vectors, and so on. The application is rightThe specific rule for dividing the first set of spatial vectors and the second set of spatial vectors is not limited.

The number of frequency domain vectors reported for each of the first set of spatial domain vectors may be less than or equal to the maximum M of the number of reported pre-configured frequency domain vectors. The number of frequency domain vectors reported for each space domain vector in the second set of space domain vectors may be a predefined value, such as 1.

Number of spatial vectors L in the second set _r2The determination may be predetermined, such as protocol definition, or the network device and the terminal device may be predetermined. For example, L_r22. The number of frequency domain vectors reported for each space domain vector in the second set of space domain vectors may be a predefined value, such as 1.

Therefore, based on the frequency domain vectors reported by the first set of space-frequency vectors, the number of space-frequency vector pairs that can be determined is less than or equal to L_r1xM, the number of the space-frequency vector pairs which can be determined based on the frequency domain vectors reported by the second group of space-frequency vectors is less than L_r1And (4) x M. The number of space-frequency vector pairs which can be determined by the first group of space-frequency vectors and the corresponding frequency domain vectors thereof and the second group of frequency domain vectors and the corresponding frequency domain vectors thereof is less than L multiplied by M. The CSI report may still employ the bitmap described above to indicate the space-frequency vector pairs reported for each transport layer.

Further, when the terminal device indicates the space vector reported for each transmission layer through the second part of the CSI report, the terminal device may report the common L for the R transmission layers_rThe spatial vectors may be shared, and the resulting indication overhead may be, for example

And (4) a bit. Optionally, the number of the common space vectors reported by R transport layers is L, and the indicated overhead may be, for example, L

And (4) a bit. The terminal device may also report corresponding space vectors for different transport layers, and the indication overhead brought by the reporting may be, for example, indication overhead of the space vectors

The specific method for indicating the space vector reported by each transport layer by the terminal device has been described in detail above, and for brevity, will not be described again here.

When the terminal device indicates the frequency domain vector reported for each transmission layer through the second part of the CSI report, the frequency domain vector may be reported for each transmission layer.

The frequency domain vector reported for the first set of spatial vectors may be M common to multiple spatial vectors in the first set of spatial vectors_rA frequency domain vector, the indication overhead brought by which may be, for example, the

And (4) a bit. Optionally, the number of the common frequency domain vectors reported for a plurality of spatial vectors in the first set of spatial vectors is M, and the indicated overhead may be, for example, M

And (4) a bit. The frequency domain vectors reported for the first set of spatial vectors may also be one or more frequency domain vectors reported for each spatial vector. If the number of the frequency domain vectors reported for each space domain vector is recorded as M_l，M_lIs more than or equal to 1 and is an integer. The total number of frequency domain vectors reported for the first set of space domain vectors may be

The indication overhead thus incurred may be, for example

And (4) a bit.

The number of frequency domain vectors reported for each of the second set of spatial domain vectors may be predefined, such as 1. The indicated overhead incurred for the frequency domain vector reported for each spatial vector in the second set of spatial vectors may be

And (4) a bit. If the number of the empty domain vectors in the second set of empty domain vectors is 2, the indicated overhead for the empty domain vectors reported by the second set of empty domain vectors may be, for example, the indicated overhead for the empty domain vectors reported by the second set of empty domain vectors

And (4) a bit.

It should be understood that the number of empty-domain vectors in the second set of empty-domain vectors listed above and the number of reported empty-domain vectors for each empty-domain vector in the second set of empty-domain vectors are only examples and should not constitute any limitation to the present application. This is not a limitation of the present application.

It should also be understood that the above shows possible scenarios and indicated overheads of reporting frequency domain vectors for a first set of spatial vectors and possible scenarios and indicated overheads of reporting frequency domain vectors for a second set of spatial vectors for ease of understanding only. This should not be construed as limiting the application in any way. The method and the device for reporting the frequency domain vector are not limited by the specific mode and the cost of the terminal device. When the protocol defines a specific mode for reporting the frequency domain vector by the terminal device in advance, the terminal device can generate the indication of the frequency domain vector in the CSI report based on the mode, and the network device can analyze the indication of the frequency domain vector in the CSI report based on the mode.

It should also be understood that various manners for indicating the space-domain vector, the frequency-domain vector, the space-frequency vector pair reported for each transmission layer and their corresponding weighting coefficients and indicating the overhead are listed above, but this is merely an example for ease of understanding and should not constitute any limitation to the present application. The method and the device for indicating the space-domain vector, the frequency-domain vector, the space-frequency vector pair and the corresponding weighting coefficients of the space-frequency vector pair reported by each transmission layer are not limited.

Based on the method described above, an indicated overhead for the second part of the CSI report may be determined from the first part of the CSI report.

Still further, the second portion of the CSI report may include a first field, a second field, and a third field.

In one possible design, the first field may include an indication of a spatial domain vector reported for each transport layer, the second field may include an indication of a frequency domain vector reported for each transport layer, and the third field may include an indication of a weighting coefficient reported for each transport layer.

In another possible design, the first field may include an indication of a frequency domain vector reported for each transport layer, the second field may include an indication of a spatial domain vector reported for each transport layer, and the third field may include an indication of a weighting coefficient reported for each transport layer.

When encoding the plurality of fields of the second portion, the encoding order of the plurality of fields may be: the first field precedes the second field, and the second field precedes the third field. And the information in each field is encoded in sequence according to the order of the Rth transport layer of the first transport layer value.

It should be understood that a schematic diagram of the arrangement of the plurality of fields in the second part is shown below in conjunction with the accompanying drawings. These drawings are shown for ease of understanding only and should not be construed as limiting the present application in any way. The coding order of the fields shown in the figure can be understood as the sequence of the corresponding bit sequences in the bit sequence generated by one CSI report. The terminal device may encode the corresponding bit sequence according to the above listed arrangement order of each information. Accordingly, the network device may decode the corresponding bit sequence according to the above listed arrangement order of the information.

It should also be understood that the above describes the encoding order of the fields of the second portion and does not represent multiple independent encodings of the fields of the second portion. The fields of the second part may be encoded as a whole, e.g. belonging to an encoded block. The encoding order described above can be understood as, for example, the order in which the bit sequences corresponding to the fields in the second part are sequentially input to the encoder. The decoding order and the encoding order of the second part by the network device may be the same, and it may be understood that the fields in the second part are sequentially parsed in the decoding order. Hereinafter, the description of the same or similar cases will be omitted for the sake of brevity.

It should also be understood that the specific processes related to encoding can refer to the prior art, and a detailed description of the specific processes thereof is omitted here for the sake of brevity.

Fig. 3 to fig. 6 are fields of the second part of the CSI report provided by the embodiment of the present application, which are shown in the coding sequence. Wherein the first field shown in fig. 3 and 5 includes an indication of a spatial domain vector for each transmission layer and the second field includes an indication of a frequency domain vector for each transmission layer. The first field shown in fig. 4 and 6 includes an indication of a frequency domain vector for each transmission layer, and the second field includes an indication of a spatial domain vector for each transmission layer.

It should be understood that fig. 3 and 4 are only examples for facilitating understanding of the coding order of the fields, and do not represent that the fields in the second part are necessarily arranged in the order shown. Further, the coding order of the fields described above may correspond to the order of the priority described above. Therefore, the coding order of the fields may also correspond to the arrangement order of the fields shown in fig. 3 and 4.

Optionally, the L space vectors reported for the R transport layers are the same. The R transport layers may share L space vectors. The indications of the space vector reported in the figure for each transport layer may be combined. That is, the space vector reported for R transport layers only needs to be indicated once.

Optionally, the M frequency domain vectors reported for the R transport layers are the same. R transport layers may share M frequency domain vectors. The indications of the frequency domain vectors reported in the graph for each transport layer may be combined. That is, the frequency domain vector reported for R transport layers only needs to be indicated once.

Accordingly, the above-described fig. 3 and 4 can be simplified to fig. 5 and 6.

Further, when the number of transmission layers R > 1, the frequency domain vectors reported for some transmission layers may be a subset of the frequency domain vectors reported for the 1 st transmission layer. As listed in table 2, table 3, table 4, table 6, table 7 and table 8 above.

Taking table 2 as an example, when the number of transmission layers R is 3, M reported for the 2 nd and 3 rd transmission layersThe/2 frequency domain vectors may be a subset of the M frequency domain vectors reported for the 1 st transport layer. If M/2 frequency domain vectors reported for the 2 nd transport layer are the same as M/2 frequency domain vectors reported for the 3 rd transport layer, the relative positions of the M/2 frequency domain vectors in the M frequency domain vectors reported for the 1 st transport layer may be further indicated, for example, by a combination index, and the indication overhead of the combination index may be, for example, the indication overhead of the combination index

And (4) a bit. In this case, the indication of the frequency domain vector reported for the 2 nd transport layer and the indication of the frequency domain vector reported for the 3 rd transport layer in fig. 3 or fig. 4 may be combined, and indicate the relative position of the M/2 frequency domain vectors in the M frequency domain vectors reported for the 1 st transport layer.

If M/2 frequency domain vectors reported for the 2 nd transport layer are different from M/2 frequency domain vectors reported for the 3 rd transport layer, the relative positions of the M/2 frequency domain vectors in the M frequency domain vectors reported for the 1 st transport layer may be respectively indicated for the 2 nd transport layer and the 3 rd transport layer, and the indication overhead brought by this may be, for example, indication overhead brought by

And (4) a bit. This indication may be placed in the position of the indication of the frequency domain vectors reported in fig. 3 or fig. 4 for the 2 nd and 3 rd transport layers, respectively.

Of course, the M/2 frequency domain vectors reported for the 2 nd and 3 rd transport layers may not be a subset of the M frequency domain vectors reported for the 1 st transport layer, in which case the frequency domain vectors reported for each transport layer may be indicated separately. When the transmission resources scheduled by the network device for the terminal device are insufficient to transmit the entire content of the CSI report, part of the information may be discarded from the second part.

Optionally, the method further comprises: and determining the discarded information in the second part according to the sequence of the priority from low to high. Wherein the priority of the third field is lower than that of the second field, and the priority of the second field is lower than that of the first field; and the priority of the information in each field is decreased in the order from the 1 st transport layer to the R-th transport layer.

In other words, the indication to discard the weighting factor in the second part may be prioritized when the transmission resources scheduled by the network device for the terminal device are insufficient to transmit the entire content of the CSI report. In the weighting factor indication, the indication of discarding the weighting factor of the R-th transport layer may be prioritized. After the indication of the weighting coefficients are completely discarded, the indication of the spatial domain vector or the indication of the frequency domain vector may be further discarded.

The coding order of the fields shown in fig. 3 to 6 is the same as the order of priority from low to high. For the sake of brevity, no further description of the drawings is provided herein.

Further, in the third field, the weighting coefficients reported for the same transport layer may correspond to at least two priorities, and the at least two priorities may include the first priority and the second priority. The magnitude of the weighting factor corresponding to the first priority may be greater than or equal to the magnitude of the weighting factor corresponding to the second priority. The weighting coefficients of the transmission layers corresponding to the first priority have a higher priority than the weighting coefficients of the transmission layers corresponding to the second priority. And in the weighting coefficients of a plurality of transmission layers corresponding to the same priority, the priority is decreased in the order from the 1 st transmission layer to the R < th > transmission layer.

For ease of understanding, fig. 7 and 8 illustrate fields in a prioritized order of the second part of the CSI report provided by the embodiments of the present application. The first field shown in fig. 7 includes an indication of a spatial domain vector for each transmission layer, and the second field includes an indication of a frequency domain vector for each transmission layer. The specific contents of the first field and the second field may be shown in fig. 3 or fig. 5, for example, and are not listed in the figure for simplicity. The first field shown in fig. 8 includes an indication of a frequency domain vector for each transmission layer, and the second field includes an indication of a spatial domain vector for each transmission layer. The specific contents of the first field and the second field may be shown in fig. 4 or fig. 6, for example, and are not listed in the figures for brevity.

As shown in the figure, in the third field, the priority of the weighting coefficient of each transport layer corresponding to the first priority is higher than the priority of the weighting coefficient of each transport layer corresponding to the second priority. The ellipses in the drawing indicate that the priorities divided based on the magnitudes of the weighting coefficients are not limited to the first priority and the second priority, and may include more priorities. The weighting coefficients corresponding to more priorities may be discarded in order of priority from lower to higher.

Optionally, the weighting coefficients reported for the same transport layer may correspond to at least two quantization levels. The number of quantization bits of the plurality of weighting coefficients may be determined by the at least two quantization levels. The at least two quantization levels may include a first quantization level and a second quantization level. The number of quantization bits of the weighting coefficients corresponding to the first quantization level may be greater than the number of quantization bits of the weighting coefficients corresponding to the second quantization level. In the third field, the priority of the weighting coefficient of each transmission layer corresponding to the first quantization level is higher than the priority of the weighting coefficient of each transmission layer corresponding to the second quantization level; and in the weighting coefficients of a plurality of transmission layers corresponding to the same quantization level, the priority is decreased progressively according to the sequence from the 1 st transmission layer to the Rth transmission layer.

The at least two quantization levels may correspond to at least two priorities as described above. That is, the "first priority" in fig. 7 and 8 may be replaced with the "first quantization level", and the "second priority" may be replaced with the "second quantization level".

It should be noted that the discarding described above is understood as determining not to encode the discarded information before encoding and decoding the second portion, so that the discarded information is not fed back to the network device and looks as if a part of the information in the second portion is discarded.

Based on the method described above, the terminal device generates a CSI report.

In step 220, the terminal device transmits the CSI report. Accordingly, the network device receives the CSI report.

The terminal device may send the CSI report to the network device through a physical uplink resource, such as a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH), so that the network device determines, based on the CSI report, a space-frequency vector pair reported for each transmission layer, so as to recover a precoding vector corresponding to each frequency domain vector on each transmission layer.

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

In step 230, the network device determines a space-frequency vector pair for constructing a precoding vector according to the CSI report.

The specific process of the terminal device indicating the number and the position of the space-frequency vector pairs reported for R transmission layers through the CSI report has been described in detail in the above step 210. And aiming at space-frequency vector pairs reported by R transmission layers, namely the space-frequency vector pairs for constructing precoding vectors.

The network device, after receiving the CSI report, may decode the first portion of the CSI report according to a predefined length of the first portion. After parsing the first portion of the CSI report, the number and position of space-frequency vector pairs reported for each transport layer may be determined, so that the indicated overhead of the second portion of the CSI report may be determined, and the second portion may be decoded.

The specific process of analyzing the CSI report by the network equipment is similar to the specific process of generating the CSI report by the terminal equipment. A detailed description of this particular process is omitted here for the sake of brevity. In addition, the specific processes related to decoding may refer to the prior art, and a detailed description of the specific processes is omitted here for the sake of brevity.

As described above, the second part of the CSI report may include an indication of the weighting coefficients reported for each transport layer, an indication of the spatial vectors reported for each transport layer, and an indication of the frequency domain vectors reported for each transport layer.

With the r-th transmission layer asFor example, the network device may determine, according to the CSI report, a space-frequency vector pair and a weighting coefficient corresponding to the r-th transmission layer, and T corresponding to the r-th transmission layer _rOne space-frequency vector pair can construct T_rA matrix of space-frequency components, the T_rThe weighted summation of the space-frequency component matrixes can obtain a space-frequency matrix corresponding to the r-th transmission layer, and then precoding vectors corresponding to the frequency domain units on the r-th transmission layer can be determined.

The specific method for determining the precoding vector corresponding to each frequency domain unit by the network device according to the space vector pair corresponding to the r-th transmission layer and the weighting coefficient has been described in detail above, and for brevity, a detailed description of the specific process is omitted here.

Based on the determination of the nth (1 ≦ N ≦ N) for each transport layer_fAnd is an integer) of the precoding vectors determined by the frequency domain units, a precoding matrix corresponding to the nth frequency domain unit can be constructed. For example, the precoding vectors corresponding to the nth frequency domain unit are sequentially arranged according to the sequence from the 1 st transmission layer to the R th transmission layer in the R transmission layers, and normalization processing is performed, so as to obtain a precoding matrix corresponding to the nth frequency domain unit.

It should be understood that the above-described method for determining the precoding vector corresponding to each frequency domain unit on each transmission layer based on the space-frequency vector pair and the weighting coefficient indicated in the CSI report, and then determining the precoding matrix corresponding to each frequency domain unit is only an example, and should not constitute any limitation to the present application. The specific method for determining the precoding matrix based on the space-frequency vector pair and the weighting coefficient by the network device is not limited in the application. The precoding vector constructed based on the space-frequency vector pair and the weighting coefficient reported by the terminal equipment is determined based on the downlink channels on the plurality of frequency domain units, and the correlation of the frequency domain is utilized, so that the precoding vector can be well adapted to the downlink channels, and higher feedback precision can be ensured. Compared with the feedback method of the type II (type II) codebook in the prior art, the feedback overhead is not increased along with the increase of the number of frequency domain units, which is beneficial to reducing the feedback overhead.

In the embodiment of the application, the terminal device generates a fixed-length bitmap in the CSI report, so that the indication overhead of other indication information is determined according to the part of the fixed-length bitmap. Therefore, the network device may determine, according to the CSI report, a space-frequency vector pair reported by the terminal device for each transmission layer and a weighting coefficient corresponding to the space-frequency vector pair, and may further construct a precoding vector corresponding to each frequency domain unit.

It should be noted that, in step 210, it is described in detail with reference to tables 1 to 8 that the design of the number of reported space-frequency vectors, the number of reported frequency-frequency vectors, and the number of reported space-frequency vector pairs configured for each transmission layer is not limited to the bitmap mentioned in the method 200. Moreover, defining the number of reported space vectors, the number of reported frequency domain vectors, and the number of reported space-frequency vector pairs configured for each transmission layer when the number of transmission layers R is different values by using a table (such as any one of tables 1 to 8 above) is only one possible implementation manner, and should not be limited in any way in this application.

In one implementation, the number K of reports of space-frequency vector pairs configured for the R-th transport layer of the R transport layers _rCan be prepared from

And (4) determining. Wherein L is_rRepresenting the number of reports of space-domain vectors configured for the r-th transport layer, M_rRepresents the reported number of frequency domain vectors configured for the r-th transmission layer, beta_rAre coefficients.

It should be noted that the coefficient β_rAnd is different from the weighting coefficients described above. The coefficient beta_rIt can be understood as the ratio of the number of reported space-frequency vector pairs to the product of the number of reported space-frequency vectors and the number of reported frequency-frequency vectors.

In addition, it should be noted that L, M and β listed below are constants. Wherein L, M and β can both be predefined values. For example, L, M and β may both be signaled by the network device or may be defined by the protocol.

As described above, L may represent, for example, the maximum value, the minimum value, or the average value of the reported number of null vectors corresponding to each of the R transport layers. When the number of polarization directions is 2, L may be replaced with 2L or may be maintained. When the number of polarization directions is 2 and L is replaced by 2L, the predefined value may still be L, for example, the network device indicates the value of L through signaling, or the value of the protocol definition L.

M may represent, for example, a maximum value, a minimum value, an average value, or the like of the reported number of frequency domain vectors corresponding to each of the R transmission layers.

The definitions above for L, M and β may apply to the various embodiments in this application. It should be understood, however, that the above definitions of L, M and β are merely examples and should not be construed to limit the present application in any way. The present application is not limited to L, M and β. Hereinafter, the description of the same or similar cases will be omitted for the sake of brevity.

Optionally, a coefficient β configured for the r-th transport layer_rAs a variable, the number of reports of the space domain vectors configured for each of the R transport layers is unchanged, and the number of reports of the frequency domain vectors configured for each transport layer is unchanged. Therefore, the reporting number K of the space-frequency vector pairs configured for the r-th transmission layer_rCan be followed by a coefficient beta_rThe sampling value changes according to the change.

For example, when the number of polarization directions is 1, the number of reports of the space domain vectors configured for each of the R transport layers is L, the number of reports of the frequency domain vectors configured for each of the R transport layers is M, and the coefficient configured for the R-th transport layer is β_r，β_rCan be individually configured. Then

Table 1 above may be regarded as K_rSatisfy the requirement of

An example of the method.

For another example, when the number of polarization directions is 2, a space vector is arranged for each of the R transmission layers The reporting number of (2L), the reporting number of the frequency domain vector configured for each transmission layer in R transmission layers is M, and the coefficient configured for the R-th transmission layer is beta_r，β_rCan be individually configured. Then

Of course, when the number of polarization directions is 2, the number of reported space vectors configured for each transmission layer may also be L. At this time, the process of the present invention,

table 5 above can be regarded as K_rSatisfy the requirement of

Or

An example of the method.

For example, if

K in Table 5 above may be replaced with

K/2 can be replaced by

Table 5 may be modified to table 11.

TABLE 11

As mentioned above, at the coefficient β_rUnder the condition of variable, the reporting number K of the space-frequency vector pairs configured for the r-th transmission layer_rCan follow beta_rThe sampling value changes according to the change. Then both Table 5 and Table 11 above can be used to represent K_rAnd L, M, beta_rThe relationship (2) of (c). It is understood that tables 5 and 11 are for K only_rAnd L, M, beta_rTwo possible manifestations of the relationship of (1), K_rAnd L, M, beta_rCan also be as shown in table 12:

TABLE 12

In fact, table 5, table 11 and table 12 above may be considered equivalent. However, it should be understood that K_rAnd L, M, beta_rThe relationship of (a) is not limited to those shown in table 5, table 11 and table 12 above. For example, β may also be directly configured _rThe ratio to β. For the sake of brevity, a list example is not repeated here.

The following lists the reported number K of space-frequency vector pairs with reference to tables 13 to 15_rSatisfy the requirement of

As yet another example of (1). Similar to the above table, tables 13, 14 and 15 may be considered equivalent.

Watch 13

Table 13 can also be expressed as table 14 or table 15:

TABLE 14

Watch 15

Tables 16 to 23 below show the reported number K of space-frequency vector pairs_rSatisfy the requirement of

To a few more examples.

TABLE 16

TABLE 17

Watch 18

Watch 19

Watch 20

TABLE 21

TABLE 22

TABLE 23

It should be understood that any of tables 16 through 23 above are allIt can be deformed based on the above relation of table 13 with tables 14 and 15 to get an equivalent table for indicating K_rAnd L, M, beta_rThe relationship (2) of (c).

It should also be understood that K is described above in connection with tables 11-23 for ease of understanding only_rAnd L, M, beta_rThe relationship (2) of (c). This should not be construed as limiting the application in any way. As described above, K is the number of polarization directions 2 or 1_rCan also satisfy

In this case, L in the above table₁To L₄All values in (1) can be replaced by L.

It should also be understood that tables 11 to 23 are only examples and should not be construed as limiting the present application in any way. When K is_rAnd L, M, beta_rHaving the above-described relationship, it is not necessarily required that all the parameters shown in the table be configured. For example, L in the table ₁To L₄Values in the four columns are the same, and if the values are all 2L, only one column can be shown; also for example, M in the table₁To M₄Values in the four columns are the same, and if all values are M, only one column can be shown; also for example, L, M and K may be shown directly_rWithout showing the value of β₁To beta₄. Based on the same concept, those skilled in the art can make appropriate modification based on the above tables. Such modifications are intended to fall within the scope of the present application.

Optionally, the reporting number M of the frequency domain vectors configured for the R-th transport layer of the R transport layers_rAs a variable, the number of reports of the space vector configured for each of the R transport layers is unchanged, and the coefficient configured for each transport layer is unchanged. Therefore, the reporting number K of the space-frequency vector pairs configured for the r-th transmission layer_rThe reported number M of vectors along with the frequency domain_rMay vary.

For example, when the number of polarization directions is 1, the number of reports of the space domain vectors configured for each of the R transport layers is L, and the number of reports of the space domain vectors configured for each of the R transport layers is LThe configured coefficient is beta, and the reporting number of the frequency domain vectors configured aiming at the r-th transmission layer is M_rAnd may be individually configured. Then

Table 2 above may be regarded as K_rSatisfy the requirement of

Several examples of (c).

For another example, when the number of polarization directions is 2, the number of reports of the space domain vectors allocated to each of the R transport layers is 2L, the coefficient allocated to each transport layer is β, and the number of reports of the frequency domain vectors allocated to the R-th transport layer is M_rAnd may be individually configured. Then

table 6 above may be regarded as K_rSatisfy the requirement of

Or

Two examples of (2).

For example, if

K in Table 6 above may be replaced with

K/2 can be replaced by

Table 6 may be modified to table 24.

Watch 24

As previously mentioned, at M_rUnder the condition of variable, the number K of reported space-frequency vector pairs configured for the r-th transmission layer_rCan follow M_rThe sampling value changes according to the change. Then both tables 6 and 24 above can be used to represent K_rAnd L, M_rBeta, beta. It is understood that tables 6 and 24 are for K only_rAnd L, M_r、β_rTwo possible manifestations of the relationship of (1), K_rThe relationship with L, M, β can also be expressed by the form as shown in table 25.

TABLE 25

In fact, table 6, table 24 and table 25 above may be considered equivalent. However, it should be understood that K _rAnd L, M_rThe relationship of β is not limited to the expressions shown in table 6, table 24 and table 25 above. For example, M may also be configured directly in the table_rRatio to M. For the sake of brevity, a list example is not repeated here.

It should be understood that K is described above in connection with tables 24 and 25 for ease of understanding only_rAnd L, M_rBeta, beta. This should not be construed as limiting the application in any way. As described above, K is the number of polarization directions 2 or 1_rCan also satisfy

It should also be understood that tables 24 and 25 are only examples and should not be construed as limiting the present application in any way.When K is_rAnd L, M_rWhen β has the above-described relationship, it is not necessarily required that all the parameters shown in the table be configured. For example, β in Table 21₁To beta₄Values in the four columns are all beta, so that only one column can be shown; as another example, L, M may be shown directly_rAnd K_rWithout showing the value of β₁To beta₄. Based on the same concept, those skilled in the art can make appropriate modification based on the above table. Such modifications are intended to fall within the scope of the present application.

It should be noted that, in the above-described example, the number of reported frequency domain vectors configured for each transmission layer is a variable, and both the number of reported spatial domain vectors configured for each transmission layer and the coefficient are fixed values. Based on the same concept, optionally, the reporting number L of the space domain vectors configured for the R-th transmission layer of the R transmission layers _rFor the variable, the reporting number of the frequency domain vectors configured for each transmission layer in the R transmission layers is not changed, and the coefficient configured for each transmission layer is not changed. Therefore, the reporting number K of the space-frequency vector pairs configured for the r-th transmission layer_rThe reported number L along with the space vector_rMay vary.

For example, when the number of polarization directions is 1, the number of reported frequency domain vectors configured for each of R transport layers is M, the coefficient configured for each transport layer is β, and the number of reported spatial domain vectors configured for the R-th transport layer is L_rAnd may be individually configured. Then

For another example, when the number of polarization directions is 2, the number of reports of the frequency domain vectors allocated to each of the R transport layers is M, the coefficient allocated to each transport layer is β, and the number of reports of the space domain vectors allocated to the R-th transport layer is 2L_rAnd may be individually configured. Then

Of course, when the number of polarization directions is 2, the number of reported space vectors configured for each transport layer may also be L_r. At this time, the process of the present invention,

it should be understood that K is described above in connection with Table 21_rAnd L, M_rBeta, beta. When L is_rIs variable, when M and beta are constant, K_rAnd L_rThe relationships of M, β are similar to those shown in table 6, table 24 or table 25 and will not be illustrated here for the sake of brevity.

Optionally, the number of reported space domain vectors and the number of reported frequency domain vectors configured for the R-th transmission layer of the R transmission layers are both variables, and a coefficient configured for each transmission layer is unchanged. Therefore, the reporting number K of the space-frequency vector pairs configured for the r-th transmission layer_rThe reported number L along with the space vector_rAnd the reported number M of frequency domain vectors_rThe sampling value changes according to the change. When L is_rAnd M_rWhen any one value changes, K_rThe value of (A) also changes.

For example, the reported number of space vectors configured for the r-th transport layer is L_rThe reporting number of the frequency domain vectors configured for the r-th transmission layer is M_rThe coefficient configured for each transport layer is β. Wherein L is_rAnd M_rMay be separately configured for each transport layer. Then

Tables 26 to 28 below show K_rSatisfy the requirement of

An example of the method. In tables 26 to 28, K is shown by taking the number of polarization directions as 2 as an example_rAnd L_r、M_rBeta, beta.

Watch 26

As mentioned above, at L_rAnd M_rUnder the condition of variable, the reporting number K of the space-frequency vector pairs configured for the r-th transmission layer_rCan follow L_rAnd M_rThe sampling value changes according to the change. Table 26 above may be used to indicate K_rAnd L_r、M_rBeta, beta. It is to be understood that Table 26 is intended to represent K only _rAnd L_r、M_rBeta, in a possible representation. K shown in Table 26 above_rAnd L_r、M_rThe relationship of β can also be expressed by the form as shown in table 27 or table 28.

Watch 27

Watch 28

Tables 26, 27 and 28 show K_rAnd L_r、M_rAn example of the relationship of β. Similar to the relationships listed above for tables 6, 24 and 25, table 26 and tables 27, 28 may be considered equivalent. However, it should be understood that K_rAnd L_r、M_rThe relationship of β is not limited to the expressions shown in table 26, table 27 and table 28 above. For example, M may also be configured directly in the table_rRatio to M, and/or, configuring L directly in the table_rRatio to L. For the sake of brevity, a list example is not repeated here.

Tables 29 and 30 below show the reported number of space-frequency vector pairs, K_rSatisfy the requirement of

To a few more examples.

Watch 29

Watch 30

It should be understood that any of tables 29 and 30 above may be modified based on the relationship of table 26 above to tables 27 and 28 to arrive at an equivalent table for indicating K_rAnd L_r、M_rBeta, beta.

It should also be understood that K is described above in connection with tables 26-30 for ease of understanding only_rAnd L_r、M_rBeta, beta. This should not be construed as limiting the application in any way. As described above, L in the above table may be replaced with L/2 when the number of polarization directions is 2 or 1.

It should also be understood that tables 26-30 are exemplary only and should not be construed as limiting the present application in any way. When K is_rAnd L_r、M_rWhen β has the above-described relationship, it is not necessarily required that all the parameters shown in the table be configured. For example, beta in the table₁To beta₄Values in the four columns are all beta, so that only one column can be shown; as another example, L may be shown directly_r、M_rAnd K_rWithout showing the value of β₁To beta₄. Based on the same concept, those skilled in the art can make appropriate modification based on the above tables. Such modifications are intended to fall within the scope of the present application.

Based on the technical scheme, the network equipment can flexibly configure the reporting number of the space domain vectors, the reporting number of the frequency domain vectors and the reporting number of the space frequency vector pairs for each transmission layer for the terminal equipment.

Fig. 9 is a schematic flow chart of a vector indication method 300 for constructing a precoding vector provided by another embodiment of the present application, which is shown from the perspective of device interaction. As shown, the method 300 may include steps 310 through 330. The steps in method 300 are described in detail below.

In step 310, the terminal device generates a CSI report, where the CSI report is used to indicate the number of space-frequency vector pairs reported for R transmission layers.

In this embodiment of the present application, when the terminal device indicates, through binary numbers, the number of space-frequency vector pairs reported for R transport layers, the number of space-frequency vector pairs reported for each transport layer may be indicated, or the total number of space-frequency vector pairs reported for R transport layers may be indicated. The field for indicating the number of space-frequency vector pairs reported for R transport layers may be an indication field with a fixed length, and is independent of the number of transport layers R.

Optionally, the indicated overhead for the number of space-frequency vector pairs reported by R transport layers is R from 1 to R_mDetermined by the middle traversal value

Is measured. In other words, the length of the indicator field is R from 1 to R_mDetermined by the middle traversal value

Is measured.

Wherein, K_rCan be expressed as the reported number of the space-frequency vector pairs pre-configured for the r < th > transmission layer, K_rNot less than 1 and K_rAre all integers. As mentioned above, this K_rSpecifically, the total reporting number of the space-frequency vector pairs preconfigured for the r-th transport layer may be represented, or a value obtained by subtracting the minimum reporting number of the space-frequency vector pairs predefined for the r-th transport layer from the total reporting number of the space-frequency vector pairs preconfigured for the r-th transport layer may be represented.

Or, K_rCan be expressed as the rNumber of reports of weighting factors, K, preconfigured by each transport layer_rNot less than 1 and K_rAre all integers. As mentioned above, this K_rSpecifically, the total reported number of the weighting coefficients preconfigured for the r-th transmission layer may be represented, or a value obtained by subtracting the minimum reported number of the weighting coefficients predefined for the r-th transmission layer from the total reported number of the weighting coefficients preconfigured for the r-th transmission layer.

However, it should be understood that for parameter K in this application_rThe definitions of (a) and (b) are merely examples and should not be construed to limit the present application in any way. For example, K can also be_rDefined as the total reported number of the space-frequency vector pairs (or weighting coefficients) pre-configured for the r-th transmission layer. In this case, the indicated overhead for the number of space-frequency vector pairs reported by R transport layers is R from 1 to R_mDetermined by the middle traversal value

Is measured. That is, the length of the indication field described above may be: r is from 1 to R_mDetermined by the middle traversal value

Is measured. Wherein, a_rRepresents the minimum number of reports of pairs of space-frequency vectors (or weighting coefficients) predefined for the r-th transport layer, a_rIs a positive integer.

In the embodiment of the application, the parameter K is referred to _rThen, it can be understood that: the total number of reports of the pre-configured space-frequency vector pairs for the r-th transmission layer, or a value obtained by subtracting the minimum number of reports of the pre-defined space-frequency vector pairs (or weighting coefficients) for the r-th transmission layer from the total number of reports of the pre-configured space-frequency vector pairs (or weighting coefficients) for the r-th transmission layer.

Specifically, when the number of transmission layers R is fixed, the terminal device may determine, according to the number of reported space-frequency vector pairs configured for each of the R transmission layers, an indication overhead for indicating the number of space-frequency vector pairs reported for each transmission layer. E.g. endThe number T of the space-frequency vector pairs reported by the end equipment aiming at the r-th transmission layer_rLess than or equal to the reporting number K of the space-frequency vector pairs configured for the r-th transmission layer_rThe indicated overhead for the number of space-frequency vector pairs reported by the r-th transport layer may be

The indication overhead of the total number of space-frequency vector pairs reported by the terminal device for each of the R transport layers may be the total number of space-frequency vector pairs reported by the terminal device for each of the R transport layers

And (4) a bit.

Since the value of R cannot be predetermined, the number of reports of space-frequency vector pairs configured for each transport layer may be different. Then the indicated overhead for the number of space-frequency vectors reported by the R transport layers can be defined as R between 1 and R _mWhile traversing to get value

The maximum value that can be taken. Therefore, the length of the indication field may be independent of the number of transmission layers R.

Based on the above design, the terminal device may indicate, through the indication field, the number of space-frequency vector pairs reported for each of the R transport layers.

Optionally, the indicated overhead for the number of space-frequency vectors reported by R transport layers is R from 1 to R_mDetermined during traversal of the middle

Is measured.

As mentioned above, this K_rSpecifically, the total reporting number of the space-frequency vector pairs preconfigured for the r-th transport layer may be represented, or a value obtained by subtracting the minimum reporting number of the space-frequency vector pairs predefined for the r-th transport layer from the total reporting number of the space-frequency vector pairs preconfigured for the r-th transport layer may be represented.

Or, K_rMay be expressed as a r-th transport layer pre-configurationNumber of reports of weighting coefficients, K_rNot less than 1 and K_rAre all integers. As mentioned above, this K_rSpecifically, the total reported number of the weighting coefficients preconfigured for the r-th transmission layer may be represented, or a value obtained by subtracting the minimum reported number of the weighting coefficients predefined for the r-th transmission layer from the total reported number of the weighting coefficients preconfigured for the r-th transmission layer.

However, it should be understood that for parameter K in this application_rThe definitions of (a) and (b) are merely examples and should not be construed to limit the present application in any way. For example, K can also be_rDefined as the total reported number of the space-frequency vector pairs (or weighting coefficients) pre-configured for the r-th transmission layer. In this case, the indicated overhead for the number of space-frequency vectors reported by R transport layers may be R from 1 to R_mDetermined during traversal of the middle

In the embodiment of the application, the parameter K is referred to_rThen, it can be understood that: the total number of reports of the pre-configured space-frequency vector pairs for the r-th transmission layer, or a value obtained by subtracting the minimum number of reports of the pre-defined space-frequency vector pairs (or weighting coefficients) for the r-th transmission layer from the total number of reports of the pre-configured space-frequency vector pairs (or weighting coefficients) for the r-th transmission layer.

Hereinafter, for convenience of explanation, R will be in the range of 1 to R_mDetermined during traversal of the middle

Is denoted as Z, for R transport layersThe length of the indication field of the number of the space-frequency vectors in the report is Z bits.

Specifically, when the number of transmission layers R is fixed, the terminal device may determine the total number of reported space-frequency vector pairs configured for R transmission layers according to the number of reported space-frequency vector pairs configured for each of the R transmission layers. For example, the number of reports configured by the terminal device for the r-th transport layer is K_rIf the total number of reports configured for R transport layers is

The terminal device may determine the indication overhead of the space-frequency vector pairs reported for the R transport layers according to the total number of reported space-frequency vector pairs configured for the R transport layers. For example, the total number reported is

The indication overhead incurred may be

And (4) a bit.

Since the value of R cannot be predetermined, the number of reports of space-frequency vector pairs configured for each transport layer may be different. Then the indicated overhead for the number of space-frequency vectors reported by the R transport layers can be defined as R between 1 and R_mWhile traversing to get value

In one implementation, in a case that the indication field is not filled, any bit may be filled in the indication field to ensure that the length of the entire indication field is fixed. In this case, the indication field may include a valid bit and a pad bit. The effective bits are used for indicating the number of space-frequency vector pairs reported by aiming at the R transmission layers, and the rest bits can be filled with any value. The padding bits may be located before the validation bit or after the validation bit, which is not limited in this application.

In another implementation, the entire indication field may be used to indicate the number of space-frequency vector pairs reported for R transport layers. The Z bits in the indication field can be used to indicate that R is 1 to R_mCan be obtained at any value

The value of (c).

Based on the above design, the terminal device may indicate the total number of space-frequency vector pairs reported for the R transport layers through the indication field. It can be understood that, in this case, the network device cannot determine the number of space-frequency vector pairs respectively reported for each transport layer according to the indication field.

It should be understood that when the protocol definition employs one of the two designs listed above for the overhead of the indication fields, the terminal device may generate the corresponding indication field based on the defined design, and the network device may also parse the indication field based on the corresponding design.

Wherein, K_rThe number of reported space-frequency vector pairs configured for the R-th transmission layer can be represented when the number of transmission layers is R. As described above in method 200, K_rThe value of (b) may be predefined, may be configured by the network device through the first indication information, or may be determined according to other parameters. This is not limited in this application.

The specific method for determining the number of reported space-frequency vector pairs reported for each transport layer has been described in detail in the method 200, and for brevity, the detailed description is omitted here.

In addition, when K is paired_rWhen the definitions of the above are different, the calculation formula of the indicated overhead for the number reported by the R transport layers will also change. The calculation manner of the indication overhead for the number of R transport layer reports determined by those skilled in the art based on the same inventive concept should fall within the protection scope of the present application.

Optionally, the number of the space-frequency vector pairs reported for the R transport layers indicates that the space-frequency vector pairs are located in the first part of the CSI report.

As mentioned before, the length of the first part of the CSI report is predefined. The length of the number indication of the space-frequency vector pairs reported by aiming at the R transmission layers can be a fixed value, and is irrelevant to the number R of the transmission layers. Therefore, the above indication of the number of space-frequency vector pairs reported for R transport layers may be designed in the first part of the CSI report. The overhead of the first part of the CSI report may be fixed and not varied with the number of transmission layers R. A protocol may predefine the overhead of the first portion to facilitate a network device decoding the first portion based on a predefined length after receiving the CSI report.

Further, the CSI report further includes a second portion including position indications for the pairs of space-frequency vectors reported by the R transport layers.

The position of the space-frequency vector pair reported for R transport layers may refer to a relative position of the space-frequency vector pair reported for each of the R transport layers in a plurality of predetermined space-frequency vector pairs. Wherein the predetermined plurality of space-frequency vector pairs may be determined by one or more space-frequency vectors and one or more frequency-domain vectors.

The relative position of the space-frequency vector pair reported for each transport layer in the predetermined plurality of space-frequency vector pairs may be indicated by, for example, the bitmap described in the above implementation manner, or may be indicated by an index of a combination of the space-frequency vector pair reported for each transport layer in the plurality of space-frequency vector pairs.

The specific method for indicating the position of the space-frequency vector pair reported for each transport layer through the bitmap has been described in detail in the above method 200, and for brevity, no further description is given here.

A specific method for indicating the space-frequency vector pair reported for each transport layer by an index is described in detail below.

Taking the r transport layer as an example, as mentioned above, the terminal device reports T for the r transport layer_rThe space-frequency vector pairs may be from L_rA space vector sum M _rDetermined by a frequency domain vectorL_r×M_rOne or more selected pairs of space-frequency vectors from the plurality of pairs of space-frequency vectors. The terminal equipment can pass the T_rThe combination of the space-frequency vector pairs is at L_r×M_rIndex in a space-frequency vector pair to indicate the T_rA pair of space-frequency vectors.

That is, the terminal device may be according to L described above_rA space vector sum M_rL obtained by combining frequency domain vectors_r×M_rThe plurality of space-frequency vectors predetermine a plurality of combinations of pairs of space-frequency vectors, each combination corresponding to an index. The T is_rThe pair of space-frequency vectors may be one of the plurality of combinations or may be close to one of the plurality of combinations. The terminal equipment can indicate the T_rThe T is indicated by means of an index of a combination of pairs of space-frequency vectors_rA pair of space-frequency vectors. The T is_rThe indication overhead brought by the space-frequency vector pair may be, for example

And (4) a bit.

In the same manner, the terminal device may respectively indicate the space-frequency vector pairs reported for each transport layer by R indexes corresponding to R transport layers. The indication overhead thus incurred may be, for example

And (4) a bit.

Optionally, the second part of the CSI report further comprises an indication of the weighting coefficients reported for each of the R transport layers.

Since the indication manner and the indication cost of the weighting coefficients have been described in detail in the method 200 above, they are not described herein again for brevity.

Since the indication manner and the indication overhead of the spatial vector have been described in detail in the above method 200, they are not described herein again for brevity.

Since the indication manner and the indication overhead of the frequency domain vector have been described in detail in the above method 200, they are not described herein again for brevity.

Still further, the second portion of the CSI report may include a first field, a second field, a third field, and a fourth field.

In one possible design, the first field may include an indication of a space-frequency vector reported for each transport layer, the second field may include an indication of a frequency-domain vector reported for each transport layer, the third field may include an indication of a weighting coefficient reported for each transport layer, and the fourth field may include an indication of a location of a pair of space-frequency vectors reported for each transport layer.

In another possible design, the first field may include an indication of a frequency domain vector reported for each transport layer, the second field may include an indication of a space domain vector reported for each transport layer, the third field may include an indication of a weighting coefficient reported for each transport layer, and the fourth field may include an indication of a location of a space-frequency vector pair reported for each transport layer.

The fourth field may be a bitmap, or may also be a combined index of a space-frequency vector pair, which is not limited in this application.

The encoding order of the plurality of fields in the second part may be: the first field precedes the second field, the second field precedes the fourth field, and the fourth field precedes the third field. And the information in each field is coded and decoded in turn according to the sequence of the Rth transmission layer of the first transmission layer value.

Fig. 10 to 13 are fields of the second part of the CSI report provided in the embodiment of the present application, which are shown in the coding sequence. The first field shown in fig. 10 and 12 includes an indication of a spatial domain vector for each transmission layer, and the second field includes an indication of a frequency domain vector for each transmission layer. The first field shown in fig. 11 and 13 includes an indication of a frequency domain vector for each transmission layer, and the second field includes an indication of a spatial domain vector for each transmission layer.

It should be understood that fig. 10 and 11 are only examples for facilitating understanding of the coding and decoding order of the fields, and do not mean that the fields are necessarily arranged in the illustrated order in the second part. Further, the coding order of the fields described above may correspond to the order of the priority described above. Therefore, the coding order of the fields may also correspond to the arrangement order of the fields shown in fig. 10 and 11.

Accordingly, the above-described fig. 10 and 11 can be simplified to fig. 12 and 13.

Further, when the number of transmission layers R > 1, the frequency domain vectors reported for some transmission layers may be a subset of the frequency domain vectors reported for the 1 st transmission layer. Thus, the indications of the frequency domain vectors reported in fig. 10 and fig. 11 for a portion of the transport layer may be combined. The above implementation manner one has been described in detail with reference to table 2, and for brevity, the description is omitted here.

When the transmission resources scheduled by the network device for the terminal device are insufficient to transmit the entire content of the CSI report, part of the information may be discarded from the second part.

Optionally, the method further comprises: and determining the discarded information in the second part according to the sequence of the priority from low to high. Wherein the priority of the third field is lower than that of the fourth field, the priority of the fourth field is lower than that of the second field, and the priority of the second field is lower than that of the first field; and the priority of the information in each field is decreased in the order from the 1 st transport layer to the R-th transport layer.

The coding order of the fields shown in fig. 10 to 13 is the same as the order of priority from low to high. For the sake of brevity, no further description of the drawings is provided herein.

For ease of understanding, fig. 14 and 15 illustrate fields in which the second part of the CSI report provided by the embodiment of the present application is prioritized. The first field shown in fig. 14 includes an indication of a spatial domain vector for each transmission layer, and the second field includes an indication of a frequency domain vector for each transmission layer. The specific contents of the first field and the second field may be shown in fig. 10 or fig. 12, for example, and are not listed in the figure for simplicity. The first field shown in fig. 15 includes an indication of a frequency domain vector for each transmission layer, and the second field includes an indication of a spatial domain vector for each transmission layer. The specific contents of the first field and the second field may be shown in fig. 11 or fig. 13, for example, and are not listed in the figure for simplicity.

The at least two quantization levels may correspond to at least two priorities as described above. That is, the "first priority" in fig. 14 and 15 may be replaced with the "first quantization level", and the "second priority" may be replaced with the "second quantization level".

Based on the two different implementation manners described above, the terminal device may indicate, to the network device, the number and the positions of the space-frequency vector pairs reported for the R transport layers through the CSI report. It should be noted that, when the protocol definition adopts a certain implementation manner to indicate the number and the position of the space-frequency vector pairs to the terminal device, the terminal device and the network device may generate the CSI report and parse the CSI report based on the same implementation manner.

In step 320, the terminal device transmits the CSI report. Accordingly, the network device receives the CSI report.

The specific process of step 320 may be the same as the specific process of step 220 in method 200 above. For brevity, no further description is provided herein.

In step 330, the network device determines the number of space-frequency vector pairs for constructing precoding vectors according to the CSI report.

The specific process of the terminal device indicating the number of space-frequency vector pairs reported for R transport layers through CSI report has been described in detail in step 310 above. And aiming at space-frequency vector pairs reported by R transmission layers, namely the space-frequency vector pairs for constructing precoding vectors.

The network device, after receiving the CSI report, may decode the first portion of the CSI report according to a predefined length of the first portion. After parsing the first part of the CSI report, the number of space-frequency vector pairs reported for R transport layers may be determined, so that at least the overhead of the second part of the CSI report may be determined, and the second part may be decoded to determine the space-frequency vector pairs reported for each transport layer.

As described above, the second part of the CSI report may include an indication of the weighting coefficients reported for each transport layer, an indication of the spatial vectors reported for each transport layer, and an indication of the frequency domain vectors reported for each transport layer. Therefore, the network device may determine the precoding vector corresponding to each frequency domain unit on each transmission layer based on the space-frequency vector pair and the weighting coefficient reported for each transmission layer, and may further determine the precoding matrix corresponding to each frequency domain unit.

The specific process of determining the precoding matrix corresponding to each frequency domain unit by the network device based on the spatial vector pair and the weighting coefficient and then determining the precoding matrix corresponding to each frequency domain unit has been described above. In addition, the specific process of determining the precoding matrix corresponding to each frequency domain unit on each transmission layer based on the space-frequency vector pair and the weighting coefficient indicated in the CSI report may refer to the prior art. For brevity, no further description is provided herein.

In the embodiment of the application, the terminal device generates a fixed-length indication field in the CSI report, so that the network device determines the indication overhead of other indication information according to the part of the fixed-length indication field. Therefore, the network device may determine, according to the CSI report, a space-frequency vector pair reported by the terminal device for each transmission layer and a weighting coefficient corresponding to the space-frequency vector pair, and may further construct a precoding vector corresponding to each frequency domain unit. The precoding vector constructed based on the space-frequency vector pair and the weighting coefficient reported by the terminal equipment is determined based on the downlink channels on the plurality of frequency domain units, and the correlation of the frequency domain is utilized, so that the precoding vector can be well adapted to the downlink channels, and higher feedback precision can be ensured. Compared with the feedback method of the type II (type II) codebook in the prior art, the feedback overhead is not increased along with the increase of the number of frequency domain units, which is beneficial to reducing the feedback overhead.

It should be understood that, in the foregoing embodiments, the sequence numbers of the processes do not imply an execution sequence, and the execution sequence of the processes should be determined by functions and internal logic of the processes, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The vector indication method for constructing a precoding vector according to the embodiment of the present application is described in detail above with reference to fig. 2 to 15. Hereinafter, the communication device according to the embodiment of the present application will be described in detail with reference to fig. 16 to 18.

Fig. 16 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown, the communication device 1000 may include a communication unit 1100 and a processing unit 1200.

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

Specifically, the communication apparatus 1000 may correspond to the terminal device in the method 200 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method executed by the terminal device in the method 200 in fig. 2. Also, the units and other operations and/or functions described above in the communication device 1000 are respectively for implementing the corresponding flows of the method 200 in fig. 2 or the method 300 in fig. 9.

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

When the communication device 1000 is configured to perform the method 300 in fig. 9, the communication unit 1100 may be configured to perform the step 320 in the method 200, and the processing unit 1200 may be configured to perform the step 310 in the method 200. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

It is further understood that when the communication apparatus 1000 is a terminal device, the communication unit 1100 in the communication apparatus 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in fig. 17, and the processing unit 1200 in the communication apparatus 1000 may correspond to the processor 2010 in the terminal device 2000 shown in fig. 17.

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

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

Specifically, the communication apparatus 1000 may correspond to the network device in the method 200 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for executing the method executed by the network device in the method 200 in fig. 2. Also, the units and other operations and/or functions described above in the communication device 1000 are respectively for implementing the corresponding flows of the method 200 in fig. 2 or the method 300 in fig. 9.

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

When the communication device 1000 is configured to perform the method 300 in fig. 9, the communication unit 1100 may be configured to perform the step 320 in the method 200, and the processing unit 1200 may be configured to perform the step 330 in the method 200. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, detailed descriptions thereof are omitted.

It should also be understood that when the communication apparatus 1000 is a network device, the communication unit in the communication apparatus 1000 may correspond to the transceiver 3200 in the network device 3000 shown in fig. 18, and the processing unit 1200 in the communication apparatus 1000 may correspond to the processor 3100 in the network device 3000 shown in fig. 18.

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

Fig. 17 is a schematic structural diagram of a terminal device 2000 according to an embodiment of the present application. The terminal device 2000 can be applied to the system shown in fig. 1, and performs the functions of the terminal device in the above method embodiment. As shown, the terminal device 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further comprises a memory 2030. The processor 2010, the transceiver 2002 and the memory 2030 may be in communication with each other via the interconnection path to transfer control and/or data signals, the memory 2030 may be used for storing a computer program, and the processor 2010 may be used for retrieving and executing the computer program from the memory 2030 to control the transceiver 2020 to transmit and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040, configured to transmit uplink data or uplink control signaling output by the transceiver 2020 by using a wireless signal.

The processor 2010 and the memory 2030 may be combined into a processing device, and the processor 2010 is configured to execute the program codes stored in the memory 2030 to achieve the above functions. In particular, the memory 2030 may be integrated with the processor 2010 or may be separate from the processor 2010. The processor 2010 may correspond to the processing unit in fig. 16.

The transceiver 2020 may correspond to the communication unit in fig. 16, and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Wherein the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that terminal device 2000 shown in fig. 17 is capable of implementing various processes involving the terminal device in the method embodiments shown in fig. 2 or fig. 9. The operations and/or functions of the modules in the terminal device 2000 are respectively to implement the corresponding flows in the above-described method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

The processor 2010 may be configured to perform the actions described in the preceding method embodiments that are implemented within the terminal device, and the transceiver 2020 may be configured to perform the actions described in the preceding method embodiments that the terminal device transmits to or receives from the network device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

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

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

Fig. 18 is a schematic structural diagram of a network device provided in the embodiment of the present application, which may be a schematic structural diagram of a base station, for example. The base station 3000 can be applied to the system shown in fig. 1, and performs the functions of the network device in the above method embodiment. As shown, the base station 3000 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 3100 and one or more baseband units (BBUs) (which may also be referred to as Distributed Units (DUs)) 3200. The RRU 3100 may be referred to as a transceiver unit and corresponds to the communication unit 1200 in fig. 16. Alternatively, the transceiving unit 3100 may also be referred to as a transceiver, transceiving circuit, or transceiver, etc., which may comprise at least one antenna 3101 and a radio frequency unit 3102. Alternatively, the transceiving unit 3100 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter, transmitting circuit). The RRU 3100 part is mainly used for transceiving and converting radio frequency signals to baseband signals, for example, for sending indication information to a terminal device. The BBU 3200 section is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 3100 and the BBU 3200 may be physically disposed together or may be physically disposed separately, i.e. distributed base stations.

The BBU 3200, which is a control center of the base station and may also be referred to as a processing unit, may correspond to the processing unit 1100 in fig. 16, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) may be configured to control the base station to perform an operation procedure related to the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

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

It should be appreciated that the base station 3000 shown in fig. 18 is capable of implementing various processes involving network devices in the method embodiments of fig. 2 or 9. The operations and/or functions of the respective modules in the base station 3000 are respectively for implementing the corresponding flows in the above-described method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

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

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

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

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

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

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

According to the method provided by the embodiment of the present application, the present application further provides a computer program product, which includes: computer program code which, when run on a computer, causes the computer to perform the method of any of the embodiments shown in figures 2 and 9.

According to the method provided by the embodiment of the present application, the present application further provides a computer-readable medium storing program code, which when run on a computer, causes the computer to execute the method of any one of the embodiments shown in fig. 2 and 9.

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

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

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

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

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

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

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

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

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

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

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

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

Claims

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

generating a Channel State Information (CSI) report, wherein the CSI report is used for indicating the number of space-frequency vector pairs reported by aiming at R transmission layers, and the indication overhead of the number of the space-frequency vector pairs is irrelevant to the number R of the transmission layers; each space-frequency vector pair comprises a space-frequency vector and a frequency-domain vector, and the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency-domain unit on the R-th transmission layer; r is greater than or equal to 1 and less than or equal to R, R is greater than or equal to 1, R and R are integers, the CSI report is further used for indicating the relative position of the space-frequency vector pair reported by each of the R transmission layers, and the relative position of the space-frequency vector pair reported by each of the R transmission layers is indicated by a bitmap; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected;

and sending the CSI report.

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

receiving a Channel State Information (CSI) report, wherein the CSI report is used for indicating the number of space-frequency vector pairs reported by aiming at R transmission layers, and the indication overhead of the number of the space-frequency vector pairs is irrelevant to the number R of the transmission layers; the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers;

And determining the number of space-frequency vector pairs reported by aiming at the R transmission layers according to the CSI report.

3. The method of claim 2, wherein the CSI report is further used to indicate a relative position of pairs of space-frequency vectors reported for each of the R transport layers.

4. The method of claim 3, wherein the relative positions of the pairs of space-frequency vectors reported for each of the R transport layers are indicated by a bitmap; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected.

5. The method of claim 3, wherein a position of a space-frequency vector pair reported for each of the R transport layers is indicated by R indices; wherein an R-th index of the R indexes is an index of a combination of space-frequency vector pairs reported by the R-th transport layer in a plurality of space-frequency vector pairs.

6. The method of claim 2, wherein the indicated overhead for the number of pairs of space-frequency vectors is: r is from 1 to R_mDetermined by the middle traversal value

Maximum value of (d); k_rThe number of reported weighting coefficients which are pre-configured for the R < th > transmission layer when the number of transmission layers is R is represented, R _mFor a predefined maximum number of transmission layers, K_r≥1，R_mNot less than 1 and K_rAnd R_mAre all integers.

7. The method of claim 2, wherein the indicated overhead for the number of pairs of space-frequency vectors is: r is from 1 to R_mDetermined during traversal of the middle

Maximum value of (d); k_rThe number of reported weighting coefficients which are pre-configured for the R < th > transmission layer when the number of transmission layers is R is represented, R_mFor a predefined maximum number of transmission layers, K_r≥1，R_mNot less than 1 and K_rAnd R_mAre all integers.

8. The method of any of claims 2 to 7, further comprising:

and sending first indication information, wherein the first indication information is used for indicating the reporting number of the space-frequency vector pairs configured for each transmission layer.

9. The method of any of claims 2 to 7, further comprising:

and sending second indication information, wherein the second indication information is used for indicating the reporting number of the space domain vectors configured for each transmission layer.

10. The method of any of claims 2 to 7, further comprising:

and sending third indication information, wherein the third indication information is used for indicating the reporting number of the frequency domain vectors configured for each transmission layer.

11. The method according to any one of claims 2 to 7, wherein when the determined weighting coefficient for each transmission layer is plural, plural weighting coefficients correspond to at least two priority levels, the at least two priority levels include a first priority level and a second priority level, a magnitude of the weighting coefficient corresponding to the first priority level is greater than or equal to a magnitude of the weighting coefficient corresponding to the second priority level, a priority level of the weighting coefficient of each transmission layer corresponding to the first priority level is higher than a priority level of the weighting coefficient of each transmission layer corresponding to the second priority level, and a priority level of the weighting coefficient of each transmission layer in the R transmission layers among the weighting coefficients of the transmission layers corresponding to the same priority level decreases in an order from the first transmission layer to the R-th transmission layer.

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

generating a Channel State Information (CSI) report, wherein the CSI report comprises a bitmap, and the length of the bitmap is irrelevant to the number R of transmission layers; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected; the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers;

And sending the CSI report.

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

receiving a Channel State Information (CSI) report, wherein the CSI report comprises a bitmap, and the length of the bitmap is irrelevant to the number R of transmission layers; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected; each space-frequency vector pair comprises a space-frequency vector and a frequency-domain vector, and the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency-domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers;

14. The method of claim 12 or 13, wherein the number of polarization directions of the transmitting antennas is 2, and the length of the bitmap is 2 lxmxr_mOne bit, R_mIs the maximum value of the predefined transmission layer number R, L is the traversal value of R from 1 to R, and R from 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R _mM determined by middle traversal value_rMaximum value of, L_rIs the number of space-domain vectors, M, reported for the r-th transport layer_rThe number of the frequency domain vectors reported by aiming at the r-th transmission layer.

15. The method of claim 12 or 13, wherein the number of polarization directions of the transmit antennas is 2, the length of the bitmap is 2 lxmx 2 bits, L is a value that R traverses from 1 to R and R is from 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R_mM determined by middle traversal value_rMaximum value of (1), R_mIs a predefined maximum value of the number of transmission layers R, L_rIs the number of space-domain vectors, M, reported for the r-th transport layer_rThe number of the frequency domain vectors reported by aiming at the r-th transmission layer.

16. The method of claim 12 or 13, wherein the number of polarization directions of the transmitting antennas is 2, the length of the bitmap is 2 lxm bits, L is r from 1 to rThe value of R is traversed and R is from 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R_mM determined by middle traversal value_rMaximum value of (1), R_mIs a predefined maximum value of the number of transmission layers R, L_rIs the number of space-domain vectors, M, reported for the r-th transport layer _rThe number of the frequency domain vectors reported by aiming at the r-th transmission layer.

17. A communications apparatus, comprising:

the device comprises a processing unit and a processing unit, wherein the processing unit is used for generating a Channel State Information (CSI) report, the CSI report is used for indicating the number of space-frequency vector pairs reported by aiming at R transmission layers, and the indication overhead of the number of the space-frequency vector pairs is irrelevant to the number R of the transmission layers; each space-frequency vector pair comprises a space-frequency vector and a frequency-domain vector, and the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency-domain unit on the R-th transmission layer; r is greater than or equal to 1 and less than or equal to R, R is greater than or equal to 1, R and R are integers, the CSI report is further used for indicating the relative position of the space-frequency vector pair reported by each of the R transmission layers, and the relative position of the space-frequency vector pair reported by each of the R transmission layers is indicated by a bitmap; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected;

a communication unit for transmitting the CSI report.

18. The communications device of claim 17, wherein the processing unit is a processor and the communications unit is a transceiver.

19. A communications apparatus, comprising:

a communication unit, configured to receive a CSI report, where the CSI report is used to indicate the number of space-frequency vector pairs reported for R transmission layers, and an indication overhead of the number of space-frequency vector pairs is independent of the number R of transmission layers; the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers;

and the processing unit is used for determining the number of the space-frequency vector pairs reported by aiming at the R transmission layers according to the CSI report.

20. The apparatus of claim 19, wherein the CSI report is further for indicating a relative position of pairs of space-frequency vectors reported for each of the R transport layers.

21. The apparatus of claim 20, wherein the relative positions of the pairs of space-frequency vectors reported for each of the R transport layers are indicated by a bitmap; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected.

22. The apparatus of claim 20, wherein a position of a space-frequency vector pair reported for each of the R transport layers is indicated by R indices; wherein an R-th index of the R indexes is an index of a combination of space-frequency vector pairs reported by the R-th transport layer in a plurality of space-frequency vector pairs.

23. The apparatus of claim 19, wherein the indicated overhead for the number of pairs of space-frequency vectors is: r is from 1 to R_mDetermined by the middle traversal value

24. The apparatus of claim 19, wherein the indicated overhead for the number of pairs of space-frequency vectors is: r is from 1 to R_mDetermined during traversal of the middle

25. The apparatus of any one of claims 19 to 24, wherein the communication unit is further configured to send first indication information indicating a reported number of space-frequency vector pairs configured for each transport layer.

26. The apparatus according to any of claims 19 to 24, wherein the communication unit is further configured to send second indication information, where the second indication information indicates a reporting number of space vectors configured for each transport layer.

27. The apparatus according to any of claims 19 to 24, wherein the communication unit is further configured to send third indication information, where the third indication information is used to indicate a reporting number of frequency domain vectors configured for each transport layer.

28. The apparatus according to any one of claims 19 to 24, wherein when the determined weighting coefficient for each transmission layer is plural, plural weighting coefficients correspond to at least two priority levels, the at least two priority levels include a first priority level and a second priority level, a magnitude of the weighting coefficient corresponding to the first priority level is greater than or equal to a magnitude of the weighting coefficient corresponding to the second priority level, a priority level of the weighting coefficient of each transmission layer corresponding to the first priority level is higher than a priority level of the weighting coefficient of each transmission layer corresponding to the second priority level, and among the weighting coefficients of the plurality of transmission layers corresponding to the same priority level, the priority levels of the weighting coefficients of each transmission layer in the R transmission layers decrease in order from the first transmission layer to the R-th transmission layer.

29. The apparatus of claim 19, wherein the processing unit is a processor and the communication unit is a transceiver.

30. A communications apparatus, comprising:

the device comprises a processing unit and a processing unit, wherein the processing unit is used for generating a Channel State Information (CSI) report, the CSI report comprises a bitmap, and the length of the bitmap is irrelevant to the number R of transmission layers; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected; the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers;

a communication unit for transmitting the CSI report.

31. A communications apparatus, comprising:

a communication unit, configured to receive a CSI report, where the CSI report includes a bitmap, and a length of the bitmap is independent of a number R of transmission layers; a plurality of indication bits in the bitmap correspond to a plurality of space-frequency vector pairs, each indication bit indicating whether the corresponding space-frequency vector pair is selected; each space-frequency vector pair comprises a space-frequency vector and a frequency-domain vector, and the space-frequency vector pair reported by the R-th transmission layer in the R transmission layers is used for constructing a precoding vector corresponding to each frequency-domain unit on the R-th transmission layer; r is more than or equal to 1 and less than or equal to R, R is more than or equal to 1, and R and R are integers;

And the processing unit is used for determining the space-frequency vector pair reported by each transmission layer according to the CSI report.

32. The apparatus of claim 30 or 31, wherein the number of polarization directions of the transmitting antennas is 2, and the length of the bitmap is 2 lxmxr_mOne bit, R_mIs the maximum value of the predefined transmission layer number R, L is the traversal value of R from 1 to R, and R from 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R_mM determined by middle traversal value_rMaximum value of, L_rIs the number of space-domain vectors, M, reported for the r-th transport layer_rThe number of the frequency domain vectors reported by aiming at the r-th transmission layer.

33. The apparatus of claim 30 or 31, wherein the number of polarization directions of the transmit antennas is 2, the length of the bitmap is 2 lxmx 2 bits, L is a value that R traverses from 1 to R and R is from 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R_mM determined by middle traversal value_rMaximum value of (1), R_mIs a predefined maximum value of the number of transmission layers R, L_rIs the number of space-domain vectors, M, reported for the r-th transport layer_rThe number of the frequency domain vectors reported by aiming at the r-th transmission layer.

34. The apparatus of claim 30 or 31, wherein the number of polarization directions of the transmit antennas is 2, the length of the bitmap is 2 lxm bits, L is a value that R traverses from 1 to R and R traverses from 1 to R_mL determined by middle traversal value_rM is the value of R traversed from 1 to R and R is from 1 to R_mM determined by middle traversal value_rMaximum value of (1), R_mIs a predefined maximum value of the number of transmission layers R, L_rIs the number of space-domain vectors, M, reported for the r-th transport layer_rThe number of the frequency domain vectors reported by aiming at the r-th transmission layer.

35. A communications apparatus comprising at least one processor configured to execute a computer program such that the method of any of claims 1 to 16 is implemented.

36. The communication device of claim 35, wherein the communication device is a chip.

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