CN111865376A

CN111865376A - Communication method and device

Info

Publication number: CN111865376A
Application number: CN201910364086.9A
Authority: CN
Inventors: 高翔; 刘鹍鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-10-30
Anticipated expiration: 2039-04-30
Also published as: CN111865376B

Abstract

The application provides a communication method and device. The method comprises the following steps: the redundant states in the indication information combination of the current CSI part 1 are effectively utilized, and under the condition of not additionally introducing overhead, the redundant states are utilized to indicate more information, so that the network equipment can more accurately acquire the state information of the downlink channel and timely adjust the configuration, and the compromise between the optimal system performance and the overhead is obtained.

Description

Communication method and device

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a communication method and apparatus.

Background

The Multiple Input and Multiple Output (MIMO) technology is a core technology of Long Term Evolution (LTE) system and New Radio (NR) of the fifth generation (5th generation, 5G).

Based on all or part of downlink Channel State Information (CSI), a Precoding (Precoding) technique can effectively improve signal transmission performance and system capacity. For a Frequency Division Duplex (FDD) system, uplink and downlink use different frequency bands, and an uplink channel cannot be used to obtain a downlink precoding matrix. In the existing wireless communication system, a downlink optimal Precoding Matrix is generally obtained in a manner that a terminal device feeds back a Precoding Matrix or a Precoding Matrix Index (PMI).

The space-frequency compression codebook is constructed by linearly combining a plurality of orthogonal space-domain basis vectors (beams) and a plurality of frequency-domain basis vectors (FD bases) selected using correlation of frequency-domain channels. Taking rank as 1, two polarization directions as an example, we can use N_fThe precoding matrixes corresponding to the frequency domain units are combined into 2N₁N₂*N_fOf (2) matrix

The number of rows of the matrix V is 2N₁*N₂The number of columns is N_fWherein V is₁To

Is and N_fN corresponding to each frequency domain unit_fThe precoding vectors, N1 and N2, are the number of antenna ports in the horizontal and vertical directions, respectively. The frequency domain length occupied by the PMI frequency domain unit may be a bandwidth of a frequency domain subband, or may be f times of the bandwidth of the frequency domain subband, for example, f is 1/2, f is 1/4, or may be 1/2/4 RBs. We can further convert the joint precoding matrix V corresponding to Nf frequency domain units into:

W₁matrix formed for selected spatial basis vectors (dimension 2N)₁N₂2L), the dual polarization direction contains 2L space-domain basis vectors (W) in total₁Column vector of (1):

wherein N is₁And N₂The number of antenna ports in the horizontal and vertical directions is respectively represented, and L selects the number of space base vectors for each spatial layer configured by the network. In one implementation, the two polarization directions select the same spatial basis vector, where the spatial basis vectors selected are

(i-0, 1, …, L-1) is a rotated DFT basis matrix (dimension N)₁N₂×N₁N₂) Of the selected I-th basis vector, correspondingly, I_S(i) Indicating the index corresponding to the selected basis vector. The rotated 2D-DFT basis matrix can be expressed as:

wherein D is_NIs an NxM orthogonal DFT matrix, the element of the M-th row and the N-th column is

Representing an N × N rotation matrix. Assuming that the twiddle factor q is uniformly distributed, then

Accordingly, a matrix formed by multiplying the rotation matrix by the DFT orthogonal matrix satisfies

W₃A matrix of frequency domain basis vectors constructed for the selected one or more frequency domain basis vectors. Wherein the selected frequency domain basis vector may be selected from a predefined DFT basis matrix or a rotated DFT basis matrix (dimension N)_f×N_f) Is selected from (1). The network equipment configures W corresponding to each spatial layer₃The number M of frequency domain basis vectors contained in (a), wherein the value of M and the number N of frequency domain units_fIn the context of a correlation, the correlation,

wherein the value of p can be {1/2, 1/4 }. If each space domain basis vector on a spatial layer corresponds to the same M frequency domain basis vectors, then

Has dimension of M × N_f，W₃Each column vector corresponds to a frequency domain basis vector, and the frequency domain basis vector corresponding to each space domain basis vector is W₃M frequency-domain basis vectors.

Is a space-frequency merging coefficient matrix with the dimension of 2L multiplied by M. Space-frequency merging coefficient matrix

The ith row in the space-frequency merging coefficient matrix corresponds to the ith space-domain basis vector in the 2L space-domain basis vectors

The jth column in (a) corresponds to the jth frequency-domain basis vector in the M frequency-domain basis vectors. The space-frequency merging coefficient corresponding to the ith space-frequency base vector is a space-frequency merging coefficient matrix

The ith row vector in (b), the space-frequency merging coefficient corresponding to the ith space-frequency base vector is a space-frequency merging coefficient matrix

The element contained in the ith row vector of (a).

Each of the L spatial basis vectors may correspond to a different frequency domain basis vector. At this time, the process of the present invention,

wherein

M corresponding to the ith space base vector_iM formed by frequency domain basis vectors_iLine N_fA matrix of columns.

Wherein

Is that the dimension corresponding to the ith space-domain basis vector is 1M_iThe space-frequency combination coefficient matrix of (a),

the space-frequency merging coefficient contained in the vector sum is the space-frequency merging coefficient corresponding to the ith space-frequency base vector. At this time, the process of the present invention,

in total comprise

And a merging coefficient. If the number of the frequency domain basis vectors corresponding to each space domain basis vector is M, then

The malaria meter contained 2LM pool coefficients.

In addition, the space-frequency matrix V can also be expressed as

At this time W₃Each row vector in (a) corresponds to a selected one of the frequency-domain basis vectors.

If each spatial layer adopts the same L space-domain basis vectors, each space-domain basis vector of the ith spatial layer corresponds to the same M _iA frequency domain basis vector. In order to control the reported overhead, the network device configures the corresponding of the ith spatial layer

Maximum number K of space-frequency merging coefficients actually reported in_0，i(K_0，i＜＝2LM_i). Wherein K_0，iThe number L of space domain basis vectors and the number M of frequency domain basis vectors corresponding to the ith spatial layer_iIn the context of a correlation, the correlation,

wherein the value of beta can be {3/4, 1/2, 1/4, 1/8 }. For example, if each space domain basis vector corresponds to M frequency domain basis vectors with the same number, after space-frequency compression, the terminal device can only report 2LM at most_iK in space-frequency combining coefficient_0，iAnd space-frequency combining coefficients. In addition, the terminal device may further report only K_0，iK in space-frequency combining coefficient_1，iA space-frequency combination coefficient and the K_1，iIndex (K) of space-frequency merging coefficient_1，i＜＝K_0，i) K is the same as_1，iThe corresponding amplitudes of the space-frequency merging coefficients are not 0. It can be understood that K_0，iSpace-frequency merging coefficient of 2LM_iA subset of space-frequency combining coefficients, K reported actually_1，iA space-frequency combining coefficient of K_0，iA subset of the space-frequency combining coefficients. K_1，iThe index of each element can be indicated by way of a bitmap (bitmap) (2L)_iM_iOne bit).

In another possible implementation, the network device configures all spatial layers corresponding to each other

The maximum number of space-frequency merging coefficients actually reported in the method does not exceed 2K ₀. Wherein K₀Is equal to the number L of space base vectors corresponding to the 1 st spatial layer₁And the number of frequency domain basis vectors M₁In the context of a correlation, the correlation,

wherein the value of beta can be {3/4, 1/2, 1/4, 1/8 }. In addition, the terminal device may further report only the 2K corresponding to all spatial layers₀K in a subset of space-frequency combining coefficients₁A space-frequency combining coefficient and the K₁Index (K) of space-frequency merging coefficient₁<＝2K₀) K is the same as₁The corresponding amplitudes of the space-frequency merging coefficients are not 0. It can be understood that K is actually reported₁The space-frequency merging coefficient is 2K corresponding to all spatial layers₀A subset of the space-frequency combining coefficients. The K is₁The index of each element can be indicated by means of bitmap corresponding to all spatial layers.

In summary, for the space-frequency compression codebook, the terminal device needs to report the following information to the network device:

1) rank indication, i.e. rank value (rank value);

2)W₁l space-domain basis vector indexes contained in the matrix;

3) w corresponding to each spatial layer₃M contained in the matrix_iA frequency domain basis vector index;

4) space-frequency merging coefficient position indication information (2 LM) corresponding to each spatial layer_ibitmap)；

5) K reported correspondingly for each spatial layer_1,iThe magnitude of each space-frequency combining coefficient;

6) k reported correspondingly for each spatial layer_1,iThe phase of each space-frequency combining coefficient.

It can be seen that for the space-frequency compression codebook, the PMI overhead is related to various parameters, wherein the selected frequency-domain basis vectors are used to construct the frequency-domain basis matrix W₃Is important information of. In addition, the current codebook design reserves great reporting flexibility for the terminal equipment. Therefore, the actual CSI reporting overhead has a large dynamic range.

Therefore, the current protocol adopts a two-stage CSI reporting structure. The CSI report is divided into CSI part 1(CSI part 1) and CSI part 2(CSI part 2). The CSI part 1 is transmitted before the CSI part 2, that is, the CSI part 1 is located at a bit position earlier in Uplink Control Information (UCI) than the CSIpart 2. CSIpart 1 has a fixed payload (payload) size (size) for determining the length of the information bits contained in CSI part 2. Based on the existing design scheme of the space-frequency compression codebook, the CSI part 1 and the CSI part 2 respectively contain the following indication information:

1) CSI part 1 is a fixed bit overhead length, and includes Rank Indication (RI), Channel Quality Indication (CQI), and the total number of reported space-frequency combining coefficients corresponding to all spatial layers, as shown in table 1. Where RI is used to indicate the number R of spatial layers.

TABLE 1 CSI report (CSI part 1)

Wherein CSI report # n in table 1 is used to indicate an index of the CSI report.

2) The CSI Part 2 contains the following indication information:

an indication of the spatial basis vector index corresponding to each spatial layer group, indicating the L used by the ith spatial layer group_iAnd the spatial base vectors adopt the same spatial base vector for the spatial layers included in each spatial layer group. In one implementation, all spatial layers use the same spatial basis vector, and the CSI part 2 includes an index indication of the spatial basis vector for indicating the selected L spatial basis vectors.

An indication of the spatial oversampling factor corresponding to each spatial layer group, wherein the spatial layers included in each spatial layer group use the same spatial oversampling factor. In one implementation, all spatial layers use the same spatial oversampling factor, and the CSI part 2 includes a spatial oversampling factor indicator for indicating the selected spatial oversampling factor.

Index indication of frequency-domain basis vectors per spatial layer for indicating M used by the ith spatial layer_iFrequency-domain basis vectors, wherein each spatial layer may employ non-identical frequency-domain basis vectors.

The position indication of the space-frequency combining coefficient (bitmap of 2 × L × M bits length) reported by each spatial layer.

The index indication of the space-frequency merging coefficient with the largest magnitude value per spatial layer.

Indication of the quantized reference amplitude values per spatial layer. Indication of

One value of (a).

The differential amplitude value of the space-frequency combination coefficient corresponding to each spatial layer. Indication of

One value of (a).

Phase values of the space-frequency combining coefficients corresponding to each spatial layer.

It can be seen that, for the number of reported space-frequency combining coefficients, the indication is performed in both CSI part 1 and CSI part 2. In the CSI part 1, the total number of space-frequency combining coefficients reported by all spatial layers is indicated

I.e. in CSI part 2, a total need indication

The amplitude values and phase values of the space-frequency combining coefficients can determine the total cost of the CSI part 2. In the CSI part 2, the number of the space-frequency combining coefficients actually reported (the number of the space-frequency combining coefficients actually reported corresponding to the ith space layer is K) is indicated by the bitmap indication information corresponding to each space layer_1，iRepresentation).

In order to ensure that the overhead of the CSI part 1 is fixed, the field indicating the total number of space-frequency combining coefficients reported by all spatial layers needs to consider the maximum optional range of the total number of space-frequency combining coefficients reported. Based on the current protocol progress, the value of the rank value R corresponding to various RI is comprehensively considered, and the maximum total number of the space frequency combining coefficients reported by all the space layers is not more than 2K ₀. Wherein

M₁Indicates the number of frequency domain basis vectors corresponding to the first spatial layer when rank is 1 or rank is 2, and

the value of p can be {1/2, 1/4}, and the value of beta can be {3/4, 1/2, 1/4, 1/8 }. Therefore, the value range of the field indicating the total number of space-frequency combining coefficients reported by all spatial layers is 1, 2₀Or 0, 1, 2K₀. Thus, CSIpart 1 includes this field

A bit or

And (4) a bit.

However, for R spatial layers, the number of combining coefficients that need to be reported at minimum per spatial layer may be limited. In one implementation, the ith of the R spatial layers reports at least α_iSpace-frequency combining coefficient, i.e. alpha_iIs the minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer, alpha_iIs a positive integer, therefore, the rank value R corresponding to RI and the total number of space-frequency combining coefficients indicating all spatial layers correspond to RI

Need to satisfy

Wherein, K_iIndicating the number of space-frequency combination coefficients corresponding to the ith spatial layer. Therefore, there is a certain redundancy state in all possible value combinations of the RI and the field indicating the total number of space-frequency combining coefficients corresponding to all spatial layers, that is, in the prior art, when the value of the field indicating the total number of space-frequency combining coefficients corresponding to all spatial layers is less than α × R, the value is meaningless and is not utilized at present.

Disclosure of Invention

The application provides a communication method and a communication device, which effectively utilize redundant states appearing in an indication information combination of a current CSI part 1, and utilize the redundant states to indicate more information under the condition of not additionally introducing overhead, so that network equipment can more accurately acquire downlink channel state information and timely adjust configuration, thereby obtaining compromise between optimal system performance and overhead.

In a first aspect, the present application provides a communication method, including: the terminal equipment determines the first indication information and the second indication informationInformation; the terminal equipment sends Channel State Information (CSI) to network equipment, wherein the CSI comprises a CSI part 1 and a CSI part 2, the CSI part 1 comprises a rank indication and the first indication information, and the CSI part 2 comprises the second indication information; the rank indication and the first indication information are used for indicating that a precoding matrix indicates that a PMI configuration parameter is insufficient and/or indicating PMI format information, a rank value corresponding to the rank indication is R, and a value corresponding to the first indication information is smaller than

R is the number of spatial layers, α_iThe minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer in the R space layers is R, alpha _iThe second indication information is used for indicating PMI information in a predefined format. Based on the scheme, the redundant states in the indication information combination of the current CSI part 1 are effectively utilized, and under the condition of not additionally introducing overhead, the redundant states are utilized to indicate more information, so that the network equipment can more accurately acquire the state information of the downlink channel and timely adjust the configuration, and the compromise between the optimal system performance and the overhead is obtained.

In a second aspect, the present application provides a method of communication, the method comprising: the method comprises the steps that a network device receives Channel State Information (CSI) from a terminal device, the CSI comprises a CSI part 1 and a CSI part 2, the CSI part 1 comprises rank indication and first indication information, the CSI part 2 comprises second indication information, the rank indication and the first indication information are used for indicating that Precoding Matrix (PMI) configuration parameters are insufficient and/or indicating PMI format information, the rank value corresponding to the rank indication is R, and the value corresponding to the first indication information is smaller than the value corresponding to the first indication information

R is the number of spatial layers, α_iThe minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer in the R space layers is R, alpha_iThe second indication information is used for indicating PMI information in a predefined format; the network equipment And determining the state information of the downlink channel according to the CSI. Based on the scheme, the redundant states in the indication information combination of the current CSI part 1 are effectively utilized, and under the condition of not additionally introducing overhead, the redundant states are utilized to indicate more information, so that the network equipment can more accurately acquire the state information of the downlink channel and timely adjust the configuration, and the compromise between the optimal system performance and the overhead is obtained.

Based on the first or second aspect described above:

in a first possible implementation method, the rank indication and the first indication information are used to indicate that PMI configuration parameters are insufficient, where the PMI configuration parameters are insufficient and are one of the following information:

the number of the space domain base vectors configured by the network equipment is small, the number of the frequency domain base vectors configured by the network equipment is small, or the proportion parameters of the frequency domain base vectors are small, the number of the maximum reported space-frequency merging coefficients is small, or the proportion parameters of the maximum reported space-frequency merging coefficients are small. The terminal equipment can obtain more accurate downlink channel state information, and can indicate whether the currently configured PMI key parameter value is appropriate or not to the network equipment through the rank indication and the specific value of the first indication information, so that the network equipment can accurately know the current downlink channel characteristics and adjust the configuration parameters in time.

The number of the space-domain basis vectors configured by the network device is smaller, which can also be understood as increasing the number of the space-domain basis vectors configured by the network device.

The number of the frequency domain basis vectors configured by the network device is smaller, which can also be understood as increasing the number of the frequency domain basis vectors configured by the network device.

The ratio parameter of the frequency domain basis vector configured by the network device is smaller, which can also be understood as increasing the ratio parameter of the frequency domain basis vector configured by the network device.

The number of the largest reported space-frequency combining coefficients is slightly smaller, which can also be understood as increasing the number of the largest reported space-frequency combining coefficients configured by the network device.

The ratio parameter of the maximum reported space-frequency merging coefficient is smaller, which can also be understood as increasing the ratio parameter of the maximum reported space-frequency merging coefficient.

Based on the first possible implementation method, as an implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is wideband PMI information corresponding to a fixed rank value. Optionally, the fixed rank value is R₀The wideband PMI information includes one or more of the following information: spatial basis vector oversampling factor, spatial basis vector index, R ₀And indicating the strongest space-domain basis vector corresponding to each space layer in the space layers and the broadband amplitude corresponding to each space-domain basis vector in each space layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is wideband PMI information, and the rank value corresponding to the wideband PMI information is R. Optionally, the wideband PMI information includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the strongest spatial domain basis vector indication corresponding to each spatial layer in the R spatial layers, and the broadband amplitude corresponding to each spatial domain basis vector in each spatial layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is single-beam PMI information corresponding to a fixed rank value. Optionally, the fixed rank value is R₀The single beam PMI information includes one or more of the following information: spatial basis vector oversampling factor, a spatial basis vector index, R ₀The method includes indicating a weak polarization direction corresponding to each spatial layer in each spatial layer, a wideband amplitude corresponding to the weak polarization direction of each spatial layer, a subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and a subband phase corresponding to the weak polarization direction of each subband in each spatial layer. And only one space domain base vector is indicated in the single-beam PMI information. For dual polarization directions, the spatial basis vector corresponds to 2 polarizationsAnd (4) direction. The weak polarization direction may be a polarization direction corresponding to a wideband amplitude or a polarization direction with a smaller reference amplitude, or a polarization direction in which a combining coefficient with a smaller amplitude is located in a combining coefficient with a largest amplitude corresponding to each of the two polarization directions. The polarization direction corresponding to the weak polarization direction may be referred to as the strong polarization direction. In one implementation, for each frequency domain unit, the combining coefficients corresponding to the spatial basis vectors in the 2 polarization directions are normalized with reference to the combining coefficient corresponding to the spatial basis vector in the strong polarization direction. After normalization, the wideband amplitude corresponding to the space domain basis vector in the strong polarization direction is 1, the combining coefficient corresponding to each frequency domain unit is 1, that is, the subband differential amplitude is 1, and the phase is 0. It is noted that, optionally, the fixed rank value is R ₀The single beam PMI information includes one or more of the following information: spatial basis vector oversampling factor, a spatial basis vector index, R₀The method includes the steps of strong polarization direction indication corresponding to each spatial layer in each spatial layer, broadband amplitude corresponding to weak polarization direction of each spatial layer, subband differential amplitude corresponding to weak polarization direction of each subband in each spatial layer, and subband phase corresponding to weak polarization direction of each subband in each spatial layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is single-beam PMI information, and the rank value corresponding to the single-beam PMI information is the R. Optionally, the single beam PMI information includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the weak polarization direction indication corresponding to each spatial layer in the R spatial layers, the broadband amplitude corresponding to the weak polarization direction of each spatial layer, the subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and the subband phase corresponding to the weak polarization direction of each subband in each spatial layer. It should be noted that, optionally, the single-beam PMI information includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the strong polarization direction indication corresponding to each spatial layer in the R spatial layers, the broadband amplitude corresponding to the weak polarization direction of each spatial layer, the subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and the subband phase corresponding to the weak polarization direction of each subband in each spatial layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients corresponding to a fixed rank value. Optionally, the fixed rank value is R₀The PMI information of the fixed number of space-frequency combining coefficients includes one or more of the following information: spatial basis vector oversampling factor, spatial basis vector index, R₀The spatial frequency combination method comprises the following steps of a frequency domain base vector corresponding to each spatial layer in each polarization direction, an amplitude value of a space-frequency combination coefficient corresponding to each spatial layer in each polarization direction, and a phase value of the space-frequency combination coefficient corresponding to each spatial layer in each polarization direction.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients, and the rank value corresponding to the PMI information of the fixed number of space-frequency combining coefficients is R. Optionally, the PMI information of the fixed number of space-frequency merging coefficients includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the frequency domain basis vector corresponding to each of the R spatial layers in each polarization direction, the amplitude value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction, and the phase value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction.

In a second possible implementation method, the rank indication and the first indication information are used to indicate PMI format information, where the PMI format information includes a rank value and third indication information corresponding to the rank indication, the third indication information is used to indicate that wideband PMI information is reported by the CSI, PMI information in a predefined format is wideband PMI information, and a rank value corresponding to the wideband PMI information is the R; alternatively, the first and second electrodes may be,

the rank indication and the first indication information are used to indicate PMI format information, the PMI format information includes a rank value corresponding to the rank indication and fourth indication information, the fourth indication information is used to indicate that the CSI is reported as single-beam PMI information, the PMI information in the predefined format is the single-beam PMI information, and the rank value corresponding to the single-beam PMI information is the R; alternatively, the first and second electrodes may be,

the rank indication and the first indication information are used to indicate PMI format information, the PMI format information includes a rank value corresponding to the rank indication and fifth indication information, the fifth indication information is used to indicate that a space-frequency combining coefficient reported by the CSI is partially deleted, and the PMI information in a predefined format is wideband PMI information, single-beam PMI information, or PMI information of a fixed number of space-frequency combining coefficients.

In a third aspect, the present application provides a communication apparatus, which may be a terminal device and may also be a chip for the terminal device. The apparatus has the function of implementing the embodiments of the first aspect described above. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a fourth aspect, the present application provides a communication apparatus, which may be a network device and may also be a chip for a network device. The apparatus has the function of implementing the embodiments of the second aspect described above. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a fifth aspect, the present application provides a communication device, comprising: a processor and a memory; the memory is used to store computer executable instructions that when executed by the processor cause the apparatus to perform the method as described in the preceding aspects.

In a sixth aspect, the present application provides a communication apparatus comprising: comprising means or units for performing the steps of the above-mentioned aspects.

In a seventh aspect, the present application provides a communication device comprising a processor and an interface circuit, the processor being configured to communicate with other devices via the interface circuit and to perform the method of the above aspects. The processor includes one or more.

In an eighth aspect, the present application provides a communication device, comprising a processor, connected to a memory, for calling a program stored in the memory to execute the method of the above aspects. The memory may be located within the device or external to the device. And the processor includes one or more.

In a ninth aspect, the present application also provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the processor to perform the method of the above aspects.

In a tenth aspect, the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects.

In an eleventh aspect, the present application further provides a chip system, including: a processor configured to perform the method of the above aspects.

In a twelfth aspect, the present application further provides a communication system, including: a terminal device for performing the method of any of the above first aspects and a network device for performing the method of any of the above second aspects.

Drawings

FIG. 1 is a schematic diagram of a possible network architecture provided herein;

fig. 2 is a schematic diagram of a communication method provided in the present application;

fig. 3 is a schematic diagram of a communication device provided in the present application;

fig. 4 is a schematic diagram of another communication device provided in the present application;

fig. 5 is a schematic diagram of another communication device provided in the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings. The particular methods of operation in the method embodiments may also be applied to apparatus embodiments or system embodiments. In the description of the present application, the term "plurality" means two or more unless otherwise specified.

Fig. 1 is a schematic diagram of a possible network architecture to which the present application is applied, which includes a network device and at least one terminal device. The network device and the terminal device may operate on a New Radio (NR) communication system, and the terminal device may communicate with the network device through the NR communication system. The network device and the terminal device may also operate on other communication systems, and the embodiments of the present application are not limited.

The terminal device may be a wireless terminal device capable of receiving network device scheduling and indication information, which may be a device providing voice and/or data connectivity to a user, or a handheld device having wireless connection capability, or other processing device connected to a wireless modem. Wireless end devices, which may be mobile end devices such as mobile telephones (or "cellular" telephones), mobile phones (or mobile phones), computers, and data cards, for example, mobile devices that may be portable, pocket, hand-held, computer-included, or vehicle-mounted, may communicate with one or more core networks or the internet via a radio access network (e.g., a Radio Access Network (RAN)). Examples of such devices include Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), tablet computers (pads), and computers with wireless transceiving functions. A wireless terminal device may also be referred to as a system, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile station), a Mobile Station (MS), a remote station (remote station), an Access Point (AP), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), a Subscriber Station (SS), a user terminal device (CPE), a terminal (terminal), a User Equipment (UE), a Mobile Terminal (MT), etc. The wireless terminal device may also be a wearable device and a next generation communication system, for example, a terminal device in a 5G network or a terminal device in a Public Land Mobile Network (PLMN) network for future evolution, a terminal device in an NR communication system, etc.

A network device is an entity, such as a new generation base station (gdnodeb), in a network side for transmitting or receiving signals. The network device may be a device for communicating with the mobile device. The network device may be an AP in a Wireless Local Area Network (WLAN), a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) or Code Division Multiple Access (CDMA), a base station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB, or eNodeB) in a Long Term Evolution (LTE), or a relay station or access point, or a vehicle-mounted device, a wearable device, and a network device in a future 5G network or a network device in a future evolved Public Land Mobile Network (PLMN), or a network device in an NR system, etc. In addition, in this embodiment of the present application, a network device provides a service for a cell, and a terminal device communicates with the network device through a transmission resource (for example, a frequency domain resource or a spectrum resource) used by the cell, where the cell may be a cell corresponding to the network device (for example, a base station), and the cell may belong to a macro base station or a base station corresponding to a small cell (smallcell), where the small cell may include: urban cells (Metro cells), Micro cells (Micro cells), Pico cells (Pico cells), Femto cells (Femto cells), and the like, and the small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-rate data transmission services. Furthermore, the network device may be other means for providing wireless communication functionality for the terminal device, where possible. The embodiments of the present application do not limit the specific technologies and the specific device forms used by the network devices. For convenience of description, in the embodiments of the present application, an apparatus for providing a wireless communication function for a terminal device is referred to as a network device.

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: the network device can process the signal to be transmitted by means of the precoding matrix matched with the channel resource under the condition of the known channel state, so that the signal to be transmitted after precoding is matched with the channel, and the complexity of eliminating the influence between the channels by the receiving 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 technology, the transmission of the transmitting device and the multiple receiving devices on the same time-frequency resource can be realized, that is, multi-user multiple input multiple output (MU-MIMO) is realized. It should be noted 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. Precoding Matrix Indication (PMI): may be used to indicate the precoding matrix. The precoding matrix may be, for example, a precoding matrix determined by the terminal device based on a channel matrix of each frequency domain unit (e.g., the frequency domain width of one frequency domain unit may be a resource block RB, or a subband, or R times of a frequency domain subband, where R < ═ 1, and the value of R may be 1 or 1/2). 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 precoding 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.

For example, 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 method provided in the embodiment of the present application, the network device may determine, based on the feedback of the terminal device, a space-frequency combining coefficient of a space-frequency vector pair, the space-frequency basis vector, the frequency-domain basis vector, and the space-frequency combining coefficient 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 the like. 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.

It can be understood that the precoding matrix determined by the terminal device can be understood as the precoding matrix to be fed back. The terminal device may indicate the precoding matrix to be fed back through the PMI, so that the network device recovers the precoding matrix based on the PMI. It is understood that the precoding matrix recovered by the network device based on the PMI may be the same as or similar to the precoding matrix to be fed back.

In the downlink channel measurement, the higher the approximation degree of the precoding matrix determined by the network device according to the PMI and the precoding matrix determined by the terminal device is, the more the determined precoding matrix for data transmission can be adapted to the channel state, and therefore, the reception quality of signals can be improved.

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

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

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

4. Antenna port: may be referred to simply as a port. It is understood as a transmitting antenna recognized by the receiving device, or a transmitting antenna that is spatially distinguishable. One antenna port may be preconfigured for each virtual antenna, each virtual antenna may be a weighted combination of multiple physical antennas, and each antenna port may correspond to one reference signal, and therefore, each antenna port may be referred to as a port of one reference signal, for example, a CSI-RS port, a Sounding Reference Signal (SRS) port, and the like. In the embodiment of the present application, an antenna port may refer to a transceiver unit (TxRU).

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

The length of the space-domain basis vector may be the number of transmit antenna ports N in one polarization direction_s，N_sIs more than or equal to 1 and is an integer. The space-domain basis 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 basis vectors are taken from a Discrete fourier Transform (DPT) matrix. Each column vector in the DFT matrix may be referred to as a DFT vector. In other words, the spatial basis vector may be a DPT vector. The spatial basis vectors may be, for example, DFT vectors defined in a type ii (typeii) codebook of the NR protocol TS 38.214 version 15(release 15, R15).

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

In one possible design, the set of spatial basis vectors may include N_sA space-domain basis vector of the N_sThe space domain base vectors can be orthogonal with each other pairwise. The space domain baseEach spatial basis vector in the vector set may be taken from a two-dimensional (2dimension, 2D) -DFT matrix. Wherein 2D may represent two different directions, e.g., a horizontal direction and a vertical direction. If the number of antenna ports in the horizontal direction and the vertical direction is N respectively ₁And N₂Then N_s＝N₁N₂。

The N is_sA spatial basis vector can be written, for example

The N is_sA matrix U can be constructed by space domain basis vectors_s，

If each space-domain basis vector in the set of space-domain basis vectors is taken from a 2D-DFT matrix, then

Wherein D_NIs an NxN orthogonal DFT matrix, the element of the m-th row and the N-th column is

In another possible design, the set of spatial basis vectors may be passed through an oversampling factor of 0_sExtension to 0_s×N_sAnd (4) spatial basis vectors. In a ratio case, the set of spatial basis vectors may include 0_sA plurality of subsets, each subset may include N_sAnd (4) spatial basis vectors. N in each subset_sThe space domain base vectors can be orthogonal with each other pairwise. Each spatial basis vector in the set of spatial basis vectors may be taken from an oversampled 2D-DFT matrix. Wherein the oversampling factor is 0_sIs a positive integer. Specifically, 0_s＝0₁×0₂，0₁May be an oversampling factor of 0 in the horizontal direction₂May be an oversampling factor in the vertical direction. 0₁≥1，0₂≥1，0₁、0₂Are not 1 at the same time and are integers.

O < th > in the set of spatial basis vectors_s(0≤o_s≤0_s-1 and o_sIs an integer) of subsets_sThe spatial basis vectors can be respectively written asBased on the o_sN of the subset_sA matrix can be constructed by space-domain basis vectors

7. Frequency domain unit: the unit of the frequency domain resource can represent different frequency domain resource granularities. The frequency domain units may include, but are not limited to, subbands (subbands), Resource Blocks (RBs), subcarriers, Resource Block Groups (RBGs), precoding resource block groups (PRGs), and so on. Furthermore, the frequency domain length of one frequency domain unit may also be R times of the CQI subband, R < ═ 1, R may take a value of 1 or 1/2, or the frequency domain length of one frequency domain unit may also be RB.

In this embodiment, the precoding matrix corresponding to a 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.

8. Frequency domain basis vector (frequency domain basis vector): also called frequency domain vector, can be used to represent the vector of the channel's law of change in the frequency domain. Each frequency domain basis 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 basis vectors.

The length of the frequency domain basis vector may be determined by the number of frequency domain units to be reported preconfigured in the reporting bandwidth, may also be determined by the length of the reporting bandwidth, and may also be a protocol predefined value. The length of the frequency domain basis vectors is not limited in the present application. The reporting bandwidth may refer to, for example, a CSI reporting bandwidth (CSI-reporting band) carried in a CSI reporting preconfiguration in a higher layer signaling (e.g., Radio Resource Control (RRC) message).

Frequency domain basis vector u_fCan be recorded as N_f，N_fIs a positive integer. The frequency domain basis vectors may be, for example, of length N_fA column vector or a row vector. This is not a limitation of the present application.

All the spatial basis vectors corresponding to each spatial layer may use the same frequency domain basis vector, and the same frequency domain basis vector used by the spatial basis vector corresponding to each spatial layer is referred to as the frequency domain basis vector corresponding to the spatial layer.

9. Candidate frequency domain basis vector set: also called frequency domain basis vector set, frequency domain vector set: frequency domain basis vectors of a variety of different lengths may be included. In the embodiment of the present application, the length of the frequency domain basis vector is N_fTherefore, the length of each frequency domain basis vector in the candidate frequency domain basis vector set to which the frequency domain basis vector reported by the terminal device belongs is N_f。

In one possible design, the set of candidate frequency-domain basis vectors may include N_fA frequency domain basis vector. The N is_fThe frequency domain basis vectors can be orthogonal with each other pairwise. Each frequency-domain basis vector in the set of candidate frequency-domain basis vectors may be taken from a DFT matrix or an IDFT matrix (i.e., the conjugate transpose of the DFT matrix).

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

The N is_fThe matrix U can be constructed by the frequency domain basis vectors _f，

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

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

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

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

10. Space-frequency precoding matrix: in the embodiment of the present application, the space-frequency precoding matrix may be understood as a matrix combined by precoding matrices corresponding to each frequency domain unit (matrix splicing is performed on the precoding matrices corresponding to each frequency domain unit), and is used to determine each frequency domain unitAn intermediate amount of the precoding matrix corresponding to the frequency domain unit. For the terminal device, the space-frequency precoding matrix may be determined by a precoding matrix or a channel matrix corresponding to each frequency domain unit. For example, the space-frequency precoding matrix may be denoted as H,

wherein, w₁To

Is and N_fN corresponding to each frequency domain unit_fEach column vector may be a target precoding matrix corresponding to each frequency domain unit, and the length of each column vector may be N_s. The N is_fEach column vector corresponds to N_fTarget precoding vectors for individual frequency domain units. I.e. the space-frequency matrix can be regarded as N_fAnd combining the target precoding vectors corresponding to the frequency domain units to form a joint matrix.

11. And (3) double-domain compression: compression in both dimensions may include spatial and frequency domain compression. Spatial compression may specifically refer to the selection of one or more spatial basis vectors from a set of spatial basis vectors as vectors for constructing a precoding vector. Frequency domain compression may refer to the selection of one or more frequency domain basis vectors in a set of frequency domain basis vectors as vectors for constructing precoding vectors. The matrix constructed by one space-domain basis vector and one frequency-domain basis vector may be referred to as a space-frequency component matrix, for example. The selected one or more spatial basis vectors and one or more frequency domain basis 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 precoding matrix corresponding to a spatial layer. In other words, the space-frequency precoding matrix may be approximated as a weighted sum of the space-frequency component matrices constructed from the selected one or more space-frequency basis vectors and the one or more frequency-domain basis vectors. Based on a space-frequency precoding matrix corresponding to a spatial layer, a precoding vector corresponding to each frequency domain unit on the spatial layer can be further determined.

In particular, one or more nulls selectedThe domain basis vectors can form a space-domain beam basis matrix W₁Wherein W is₁Each corresponding to a selected one of the spatial basis vectors. The selected one or more frequency-domain basis vectors may form a frequency-domain basis matrix W₃Wherein W is₃Each corresponding to a selected one of the frequency-domain basis vectors. The space-frequency precoding matrix H may be represented as a result of a linear combination of the selected one or more spatial basis vectors and the selected one or more frequency-domain basis vectors,

in one implementation, if dual polarization directions are used, L space basis vectors, W, are selected for each polarization direction₁Has a dimension of 2N_sX2L. In one possible implementation, the same L space-domain basis vectors are used for the two polarization directions

At this time, W₁Can be expressed as

Wherein

Represents the selected ith spatial basis vector, i-0, 1.

For example, for a spatial layer, if each spatial basis vector selects the same M frequency-domain basis vectors, then

Is a space-frequency merging coefficient matrix with the dimension of 2L multiplied by M.

Space-frequency merging coefficient matrix

The jth column in (a) corresponds to the jth frequency-domain basis vector in the M frequency-domain basis vectors. The space-frequency merging coefficient vector corresponding to the ith space-frequency base vector is a space-frequency merging coefficient matrix

The element contained in the ith row vector of (a).

wherein

Wherein

the space-frequency merging coefficient contained in the vector sum is the space-frequency merging coefficient corresponding to the ith space-frequency base vector.

In addition, the space-frequency matrix V can also be expressed as

Since the dual-domain compression is performed in both spatial and frequency domains, the terminal device may feed back the selected one or more spatial basis vectors and one or more frequency-domain basis vectors to the network device during feedback, instead of feeding back the space-frequency combining coefficients (e.g., including amplitude and phase) of the sub-bands separately on a per frequency-domain basis (e.g., sub-bands). Thus, feedback overhead can be greatly reduced. Meanwhile, since the frequency domain basis vectors 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 basis 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.

12. Space-frequency combining coefficient, amplitude and phase: the space-frequency combining coefficient is also called a combining coefficient and is used for representing the weight of a vector pair formed by one space-domain basis vector and one frequency-domain basis vector for constructing the space-frequency precoding matrix. As described above, the space-frequency combining coefficients have a one-to-one correspondence relationship with a vector pair consisting of a space-domain basis vector and a frequency-domain basis vector, or each space-frequency combining coefficient corresponds to a space-domain basis vector and a frequency-domain basis vector. In particular, the space-frequency merging coefficient matrix

And the element in the ith row and the jth column in the middle is a space-frequency merging coefficient corresponding to a vector pair formed by the ith space-frequency base vector and the jth frequency-domain base vector.

In one implementation, to control the reporting overhead, the terminal device may only report the space-frequency merging coefficient matrix

The subset of 2LM space-frequency combining coefficients contained in (a). Specifically, the network device may configure the maximum number K of space-frequency merging coefficients that can be reported by the terminal device corresponding to each spatial layer₀In which K is₀<＝2LM。K₀And

the total number of space-frequency merging coefficients 2LM contained in the system can have a proportional relation, such as K₀β · 2LM, β may take the value {3/4,1/2,1/4 }. In addition, the terminal device may only report K ₁A space-frequency combination coefficient of amplitude other than 0, and K₁<＝K₀。

Each space-frequency combining coefficient may include an amplitude and a phase. For example, space-frequency merging coefficients ae^jθWhere a is the amplitude and θ is the phase.

In one implementation, for reported K₁And the amplitude value and the phase value of each space-frequency combination coefficient can be independently quantized. Wherein the quantization method for the amplitude comprises the steps of:

1) for K₁A space-frequency combination coefficient with the largest amplitude value as reference for K₁Normalizing the space-frequency merging coefficients if the ith space-frequency merging coefficient is c before normalization_iIs then c 'after normalization'_i＝c_i/c_i*Wherein c is_i*The space-frequency combination coefficient with the largest amplitude value is obtained. After normalization, the space-frequency combination coefficient with the largest quantized reference amplitude value is 1.

2) The terminal device reports the index of the space-frequency merging coefficient with the maximum amplitude value, and the indication information indicating the index of the space-frequency merging coefficient with the maximum amplitude value may include

A bit.

3) And for the polarization direction in which the space-frequency merging coefficient with the largest amplitude value is located, the quantized reference amplitude value is 1. For another polarization direction, the magnitude of the space-frequency combination coefficient with the largest magnitude in the polarization direction can be used as the quantized reference magnitude value of the polarization direction. Quantizing the quantized reference amplitude value by adopting 4 bits and reporting, wherein the candidate quantized reference amplitude value comprises

4) For each polarization direction, respectively taking the quantization reference amplitude value corresponding to the polarization direction as a reference, and performing 3-bit quantization on the differential amplitude value of each space-frequency merging coefficient, wherein the candidate differential amplitude values comprise

The difference amplitude value represents a difference value between the quantized reference amplitude value corresponding to the polarization direction, and if the quantized reference amplitude value corresponding to the polarization direction in which one space-frequency combining coefficient is located is a and the difference amplitude value after the space-frequency combining coefficient is quantized is B, the amplitude value after the space-frequency combining coefficient is quantized is a × B.

5) The phase of each normalized space-frequency combination coefficient is quantized by 3 bits (8PSK) or 4 bits (16 PSK).

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

It should be understood that the space-frequency combining coefficient may be indicated by a quantized value, may also be indicated by an index of a quantized value, or may also be indicated by a non-quantized value, and the present application does not limit the indicating manner of the space-frequency combining coefficient, as long as an opposite end is allowed to know the space-frequency combining coefficient. Hereinafter, for convenience of explanation, information indicating the space-frequency combining coefficient is referred to as quantization information of the space-frequency combining coefficient. The quantization information may be, for example, a quantization value, an index, or any other information that may be used to indicate the space-frequency combining coefficients.

13. Spatial layer (layer): in MIMO, one spatial layer can be seen as one independently transmittable data stream. In order to improve the utilization rate of spectrum resources and improve the data transmission capability of the communication system, the network device may transmit data to the terminal device through a plurality of spatial layers.

The number of spatial layers is the rank of the channel matrix. The terminal device may determine the number of spatial 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 spatial 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 spatial layer, and the precoding vector determined by the eigenvector corresponding to the smallest eigenvalue may be associated with the R-th spatial layer. That is, the eigenvalues corresponding to the 1 st to R-th spatial layers decrease in order. In brief, the intensity of the 1 st spatial layer to the R th spatial layer in the R spatial layers decreases sequentially.

It should be understood that distinguishing different spatial layers based on feature 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 spatial layers in advance, which is not limited in this application.

14. Channel State Information (CSI) report (report): in a wireless communication system, information describing channel properties of a communication link is reported by a receiving end (e.g., a terminal device) to a transmitting end (e.g., a network device). The CSI report may include, but is 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), a Layer Indicator (LI), and the like.

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 within one time unit may be referred to as one-time CSI reporting.

In the embodiment of the present application, when the terminal device generates the CSI report, the content in the CSI report may be divided 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 first and second parts are similar to part 1(part 1) and part 2(part 2) of CSI as defined in the NR protocol TS38.214 version 15(release 15, R15).

15. Broadband merging coefficient: as a possible implementation manner, in the entire system bandwidth, each frequency domain unit uses the same precoding vector, that is, for each of the selected 2L spatial basis vectors, the corresponding combining coefficient of the spatial basis vector in each frequency domain unit is the same. For example, if the system bandwidth includes 2 frequency domain units, when the terminal transmits signals in frequency domain unit 1, for a spatial basis vector of the 2L spatial basis vectors, the corresponding combining coefficient is the same as the combining coefficient corresponding to the spatial basis vector when the terminal transmits signals in frequency domain unit 2. In this case, the combining coefficient of the beam corresponding to the entire system bandwidth is referred to as a wideband combining coefficient. This means that, given the wideband combining coefficient of a certain beam, the frequency domain unit combining coefficient corresponding to each frequency domain unit of the space-domain basis vector in the system bandwidth can be obtained. For example, if the system bandwidth includes 2 frequency domain units (frequency domain unit 1 and frequency domain unit 2), and the wideband combining coefficient of the spatial basis vector 1 is denoted as coefficient 1, the combining coefficient of the spatial basis vector 1 in the frequency domain unit of the frequency domain unit 1 is coefficient 1, and the combining coefficient of the beam 1 in the frequency domain unit corresponding to the frequency domain unit 2 is also coefficient 1.

In the present embodiment, the wideband combining coefficient may be represented by a wideband amplitude and a wideband phase. This means that when reporting the wideband combining coefficient corresponding to the space-domain basis vector, the terminal needs to report the wideband amplitude quantization value and the wideband phase quantization value of the space-domain basis vector.

16. Broadband amplitude corresponding to the space domain basis vector: the amplitude of the wideband combination coefficient corresponding to the space domain basis vector is called the wideband amplitude corresponding to the space domain basis vector, and may also be referred to as the wideband amplitude for short.

17. The subband differential amplitude corresponding to the space domain basis vector is as follows: in each frequency domain unit, the ratio of the amplitude value corresponding to the spatial domain basis vector to the wideband amplitude corresponding to the spatial domain basis vector is referred to as the subband differential amplitude corresponding to the spatial domain basis vector, or simply referred to as the subband differential amplitude. That is, the amplitude value corresponding to the spatial basis vector may be represented as a product of the wideband amplitude corresponding to the spatial basis vector and the subband differential amplitude.

18. The weak polarization direction may be a polarization direction corresponding to a wideband amplitude or a polarization direction with a smaller reference amplitude, or may be a polarization direction in which a combining coefficient with a smaller amplitude is located in a combining coefficient with a largest amplitude corresponding to each of the two polarization directions. The polarization direction corresponding to the weak polarization direction may be referred to as the strong polarization direction.

It should also be understood that, since the embodiments of the present application mainly relate to reporting of PMI and reporting of RI, the following embodiments may include related information such as PMI and RI in the first and second parts of CSI report, and do not relate to others. 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 CQI and RI, 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.

Before describing the embodiments of the present application, the following description will be made first.

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 spatial layers indicated in the RI;

l: the number of space domain basis vectors in each space layer;

M_i: the number of frequency domain basis vectors in the ith spatial layer.

Second, in the present embodiment, for convenience of description, when referring to numbering, numbering may be continued from 1. For example, the R spatial layers may include 1 st spatial layer to R th spatial layer, the L beam vectors may include 1 st beam vector to 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.

Fourth, in the embodiments of the present application, the embodiments provided in the present application are described by taking the case where the beam vector and the frequency domain basis 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.

The following description is provided to explain the present invention in detail.

In the following embodiments of the present application, if there is no specific description, the smaller may be understood as increasing the number of configured parameters or increasing the ratio parameter of the configured parameters. For example, if the number of spatial basis vectors configured by the network device is small, it can also be understood that the number of spatial basis vectors configured by the network device is increased. For another example, if the number of frequency domain basis vectors configured by the network device is smaller, it can also be understood that the number of frequency domain basis vectors configured by the network device is increased. For another example, if the ratio parameter of the frequency domain basis vector configured by the network device is smaller, it can also be understood that the ratio parameter of the frequency domain basis vector configured by the network device is increased. For another example, if the number of the maximum reported space-frequency combining coefficients is small, it can also be understood that the number of the maximum reported space-frequency combining coefficients configured by the network device is increased. For another example, if the ratio parameter of the maximum reported space-frequency combining coefficient is smaller, it can also be understood that the ratio parameter of the maximum reported space-frequency combining coefficient is increased.

The CSI report sent by the terminal device to the network device includes CSI part 1 and CSI part 2, where the CSI part 1 and CSI part 2 respectively include contents as described in the background.

The design idea of the space-frequency compression codebook CSI reporting format is as follows: the CSI part 1 includes at least RI and first indication information, and the CSI part 2 includes at least second indication information.

In this application, the minimum value of the number of reported space-frequency merging coefficients corresponding to the ith space layer in the predefined R space layers is α_i，α_iIs a positive integer, therefore, the total number of reported space-frequency combining coefficients corresponding to the R spatial layers indicated by the RI is at least

When the total number of reported space-frequency combining coefficients corresponding to the R spatial layers needs to be indicated, the first indication information may be used for indication, and the content of the second indication information used for indication is as described in the background art. Therefore, the value corresponding to the first indication information is larger than

The values of the spatial frequency combination coefficients are used for indicating the total number of the reported spatial frequency combination coefficients corresponding to the R spatial layers.

But some of all values of the first indication information (i.e. less than

All values of) have no meaning or are understood to be unused. The method and the device report the additional information to the network equipment by using the values of the first indication information, and correspondingly, the information indicated by the second indication information also needs to be redefined when the first indication information is used for reporting the additional information.

Various designs of the first indication information and the second indication information are described below.

In the following, various designs are describedIn the scheme, the values corresponding to the first indication information of the CSI part 1 are all smaller than

Design for Rank Indication (RI) and first indication information in CSI part 1

Design 1, rank indication, and first indication information are used to indicate that the PMI configuration parameters are insufficient.

This design 1 further includes:

design 1.1, rank indication and first indication information are used to indicate that the PMI configuration parameters are insufficient, and the PMI configuration parameters are insufficient as follows: the number of the spatial domain basis vectors configured by the network equipment is small. At this time, the terminal device indicates, through the rank indication and the first indication information, to the network device that the value of the current configured space-domain basis vector cannot meet the accuracy requirement or the system performance requirement of reporting the PMI, and proposes that the network device configures a value larger than the current value of the number of the space-domain basis vectors as a parameter for subsequent CSI measurement. Correspondingly, after the network equipment receives the CSI report, the number of the current configured space domain basis vectors can not meet the requirement through the rank indication and the value of the first indication information, and when subsequent CSI measurement is triggered, a value larger than the value of the current space domain basis vector number is configured, or the number of the space domain basis vectors is adjusted according to a preset proportion.

Design 1.2, rank indication and first indication information are used to indicate that the PMI configuration parameters are insufficient, and the PMI configuration parameters are insufficient as follows: the number of the frequency domain basis vectors configured by the network equipment is smaller or the proportion parameter of the frequency domain basis vectors is smaller. At this time, the terminal device indicates, through the rank indication and the first indication information, to the network device that the value of the currently configured frequency domain basis vector cannot meet the accuracy requirement or the system performance requirement of reporting the PMI, and proposes that the network device configures a value larger than the current value of the number of the frequency domain basis vectors as a parameter for subsequent CSI measurement. Accordingly, after the CSI report is received, the network device knows that the number of currently configured frequency domain basis vectors cannot meet the requirement through the rank indication and the value of the first indication information, and configures a value larger than the value of the current frequency domain basis vector number or adjusts the number of frequency domain basis vectors according to a preset ratio when subsequent CSI measurement is triggered.

The number of frequency domain basis vectors of the network device configuration is the number M of frequency domain basis vectors included in W3 corresponding to each spatial layer of the network device configuration described in the background art,

here, p is a proportional parameter of the frequency domain basis vector, so that a smaller proportional parameter of the frequency domain basis vector means that the number of frequency domain basis vectors configured by the network device is smaller, and conversely, a smaller number of frequency domain basis vectors configured by the network device means that the proportional parameter of the frequency domain basis vector is smaller.

Design 1.3, rank indication and first indication information are used to indicate that the PMI configuration parameters are insufficient, and the PMI configuration parameters are insufficient as follows: the number of the space-frequency combining coefficients reported maximally is smaller or the proportional parameter of the space-frequency combining coefficients reported maximally is smaller. At this time, the terminal device indicates, to the network device, through the rank indication and the first indication information, that the number of currently configured maximum reported space-frequency combining coefficients cannot meet the accuracy requirement or the system performance requirement for reporting the PMI, and proposes that the network device configures a value larger than the number of currently maximum reported space-frequency combining coefficients as a parameter for subsequent CSI measurement. Accordingly, after the network device receives the CSI report, it knows that the number of currently configured maximum reported space-frequency combining coefficients cannot meet the requirement through the rank indication and the value of the first indication information, and configures a value larger than the value of the currently maximum reported space-frequency combining coefficients when triggering subsequent CSI measurement, or adjusts the number of the maximum reported space-frequency combining coefficients according to a preset ratio.

The maximum number of reported space-frequency merging coefficients is the number corresponding to the ith spatial layer configured by the network device described in the background art

Maximum number K of space-frequency merging coefficients actually reported in _0,i(K_0,i<＝2LM_i) In which K is_0,iIs taken to be empty corresponding to the ith spatial layerNumber of domain basis vectors L and number of frequency domain basis vectors M_iIn the context of a correlation, the correlation,

here, β is a proportional parameter of the maximum reported space-frequency combining coefficient, and therefore, a smaller proportional parameter of the maximum reported space-frequency combining coefficient means that the number of the maximum reported space-frequency combining coefficients configured by the network device is smaller, and conversely, a smaller number of the maximum reported space-frequency combining coefficients configured by the network device means that the proportional parameter of the maximum reported space-frequency combining coefficient is smaller.

In the various design schemes of the above design scheme 1, the combination of the redundancy values of the RI and the first indication information in the CSI portion 1 is used to implicitly indicate whether the codebook parameters configured by the current network device are appropriate, so that the network device can accurately know the current channel condition, adjust the configuration parameters in time, and contribute to improving the system performance.

Design scheme 2: rank indication and first indication information for indicating PMI format information

The design 2 may further include:

design 2.1, the rank indication and the first indication information are used to indicate PMI format information, and the PMI format information includes a rank value corresponding to the rank indication and third indication information, and the third indication information is used to indicate that what is reported on the CSI is wideband PMI information. Or, the third indication information is used for indicating the second indication information of the CSI component 2 to report the wideband PMI information. The wideband PMI information indicates that the combining coefficient corresponding to each space domain basis vector contained in the reported PMI is a wideband combining coefficient.

According to the design scheme, the current CSI part 2 format is adopted to indicate the wide-band PMI or the PMI information of the space-frequency compression codebook under special design has large overhead waste. The scheme provides compatible CSI part 1 formats for different codebook forms, and only through the value combination of two fields of RI and first indication information, the reporting format actually adopted in the CSI part 2 is implicitly represented. Therefore, a new PMI indication method is introduced for the special codebook structure, and the indication overhead is reduced to the maximum extent.

Design 2.2, the rank indication and the first indication information are used to indicate PMI format information, and the PMI format information includes a rank value corresponding to the rank indication and fourth indication information, and the fourth indication information is used to indicate that CSI reporting is single-beam PMI information. Or, the third indication information is used to indicate the second indication information of the CSI component 2 to report the single-beam PMI information. The single-beam PMI information indicates that each polarization direction in the reported PMI only contains one airspace base vector and a corresponding merging coefficient.

The design scheme provides a simple design method of the fixed overhead PMI. Because each polarization direction must have a strongest space-domain basis vector which is crucial to system performance, the reported single-beam PMI information has the characteristics of low cost and fixed cost, and the requirement of low-cost CSI feedback can be better met.

Design 2.3, the rank indication and the first indication information are used to indicate PMI format information, and the PMI format information includes a rank value corresponding to the rank indication and fifth indication information, and the fifth indication information is used to indicate that a space-frequency combining coefficient reported by CSI is partially deleted. Or, the third indication information is used to indicate that the space-frequency combining coefficient reported by the second indication information of the CSI component 2 is partially deleted.

According to the design scheme, the combination of the RI in the CSI part 1 and the redundancy values of the two fields of the first indication information is utilized to implicitly indicate whether the uplink resources configured by the current network equipment are proper, and if the fact that part of the space-frequency merging coefficients contained in the current CSI part 2 is deleted is indicated, the current uplink resource allocation is insufficient, so that the network equipment can be facilitated to adjust the resource allocation in time, and the system performance is facilitated to be improved.

In practical applications, the various designs of design 1 described above may be used in combination, and the present application is not limited thereto.

Second, design for second indication information in CSI part 2

The second indication information is used for indicating PMI information of a predefined format.

In design 1, the PMI information in the predefined format is wideband PMI information.

In an implementation method, a value of the first indication information may be taken from 0, that is, a value corresponding to the first indication information includes zero. In another implementation method, the value of the first indication information is taken from 1, that is, the value corresponding to the first indication information does not include zero.

According to whether the value corresponding to the first indication information may include zero, the design scheme 1 may further be divided into:

in the design scheme 1.1, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is wideband PMI information corresponding to a fixed rank value.

As an implementation, assume a fixed rank value of R₀Then the wideband PMI information may include: spatial basis vector oversampling factor, spatial basis vector index, R₀And indicating the strongest space-domain basis vector corresponding to each space layer in the space layers and the broadband amplitude corresponding to each space-domain basis vector in each space layer.

R in this case₀The preset value is, for example, 1, 2, 3, etc. In addition, R is₀And R do not have a necessary size relationship, e.g. R₀May be greater than R, may be equal to R, or may also be less than R.

In the design scheme 1.2, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is wideband PMI information, the rank value corresponding to the wideband PMI information is R, and the R is the rank value corresponding to the Rank Indication (RI) of the CSI portion 1.

As an implementation method, the wideband PMI information may include: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the strongest spatial domain basis vector indication corresponding to each spatial layer in the R spatial layers, and the broadband amplitude corresponding to each spatial domain basis vector in each spatial layer.

Here, R is a rank value corresponding to the rank indication of CSI component 1.

In design 2, the PMI information of the predefined format is single beam PMI information.

According to whether the value corresponding to the first indication information may include zero, the design scheme 2 may further be divided into:

in the design scheme 2.1, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is single-beam PMI information corresponding to a fixed rank value.

As an implementation, assume a fixed rank value of R₀Then, the single beam PMI information may include: spatial basis vector oversampling factor, a spatial basis vector index, R₀The method includes indicating a weak polarization direction corresponding to each spatial layer in each spatial layer, a wideband amplitude corresponding to the weak polarization direction of each spatial layer, a subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and a subband phase corresponding to the weak polarization direction of each subband in each spatial layer. In another implementation, the single beam PMI information may include: spatial basis vector oversampling factor, a spatial basis vector index, R ₀The method includes the steps of strong polarization direction indication corresponding to each spatial layer in each spatial layer, broadband amplitude corresponding to weak polarization direction of each spatial layer, subband differential amplitude corresponding to weak polarization direction of each subband in each spatial layer, and subband phase corresponding to weak polarization direction of each subband in each spatial layer.

In the design scheme 2.2, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is single-beam PMI information, the rank value corresponding to the single-beam PMI information is R, and the R is the rank value corresponding to the Rank Indication (RI) of the CSI portion 1.

As one implementation method, the single beam PMI information includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the weak polarization direction indication corresponding to each spatial layer in the R spatial layers, the broadband amplitude corresponding to the weak polarization direction of each spatial layer, the subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and the subband phase corresponding to the weak polarization direction of each subband in each spatial layer. As another implementation method, the single-beam PMI information includes an airspace base vector oversampling factor, an airspace base vector index, a strong polarization direction indication corresponding to each of the R spatial layers, a wideband amplitude corresponding to a weak polarization direction of each spatial layer, a subband differential amplitude corresponding to a weak polarization direction of each subband in each spatial layer, and a subband phase corresponding to a weak polarization direction of each subband in each spatial layer.

Design 3, the PMI information of the predefined format is PMI information of a fixed number of space-frequency combining coefficients.

According to whether the value corresponding to the first indication information may include zero, the design scheme 3 may further be divided into:

in the design scheme 3.1, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients corresponding to a fixed rank value.

As an implementation, assume a fixed rank value of R₀The PMI information of the fixed number of space-frequency combining coefficients may include one or more of the following information: spatial basis vector oversampling factor, spatial basis vector index, R₀The spatial frequency combination method comprises the following steps of a frequency domain base vector corresponding to each spatial layer in each polarization direction, an amplitude value of a space-frequency combination coefficient corresponding to each spatial layer in each polarization direction, and a phase value of the space-frequency combination coefficient corresponding to each spatial layer in each polarization direction.

R in this case₀The preset value is, for example, 1, 2, 3, etc. In addition, R is₀And R do not have a necessary size relationship, e.g. R ₀May be greater than R, may be equal to R, or may also be less than R.

In design scheme 3.2, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients, the rank value corresponding to the PMI information of the fixed number of space-frequency combining coefficients is R, and the R is a rank value corresponding to Rank Indication (RI) of CSI portion 1.

As one implementation method, the PMI information of the fixed number of space-frequency combining coefficients includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the frequency domain basis vector corresponding to each of the R spatial layers in each polarization direction, the amplitude value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction, and the phase value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction. In one implementation, the PMI information of the fixed number of space-frequency combining coefficients may be PMI information that each spatial layer fixedly reports 2 space-frequency combining coefficients, where each polarization direction of each spatial layer reports 1 space-frequency combining coefficient. At this time, the PMI information of the fixed number of space-frequency combining coefficients includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the frequency domain basis vector corresponding to each spatial layer in the R spatial layers in each polarization direction, the amplitude value of the spatial frequency combination coefficient corresponding to each spatial layer in the R spatial layers in the weak polarization direction, and the phase value of the spatial frequency combination coefficient corresponding to each spatial layer in the R spatial layers in the weak polarization direction. Here, R is a rank value corresponding to the rank indication of CSI component 1.

In practical applications, the above-mentioned various designs for design 1 and design 2 may be used in combination, and the present application is not limited thereto.

In the various designs for the second indication information described above, the PMI information indicated in the CSI portion 2 is decoupled from the information indicated in the CSI portion 1 (i.e., PMI configuration parameter insufficiency indication and/or PMI format information). The CSI part 2 indicates a PMI of fixed overhead such as a wideband PMI or a single beam PMI, etc. Therefore, the problem that the current CSI report can not carry PMI information according to the current CSI reporting rule is avoided, and the scheme can utilize the current CSI reference signal resource to the maximum extent.

The various designs described above are explained below with reference to specific examples.

Assuming that the spatial-frequency compression codebook supports the maximum number of spatial layers to be 4, all spatial layers correspond to the same L spatial basis vectors in each polarization direction, and each spatial layer independently selects the corresponding frequency domain basis vector. For the ith spatial layer (1)<＝i<4), the number of corresponding frequency domain basis vectors is M_i. For rank 1 and rank 2, the network device configures the maximum number of reported space-frequency merging coefficients of each spatial layer to be K₀For rank 3 and rank 4, the total number of space-frequency combining coefficients reported by all spatial layers does not exceed 2K ₀。

Take the example that each of R spatial layers reports at least one space-frequency merging coefficient, i.e. α is given to any i (i is 1 to R), i_i＝1。

For rank R, if it needs to be ensured that each of R spatial layers reports at least one space-frequency combining coefficient, when P < R, it means that at least one spatial layer does not have a corresponding space-frequency combining coefficient, and P represents the total number of space-frequency combining coefficients reported by all spatial layers. Therefore, the combination of the RI and the value in the first indication information is meaningless when P < R appears, and can be regarded as redundant state information.

If the value range of the first indication information is 1,2, …,2K₀(in this design, the value corresponding to the first indication information does not include 0), and table 2 lists all redundant RI and first indication information value combinations (6 redundant value combinations in total). At this time, the value of RI is incomplete, and referring to table 2, the case where RI is 1 is not included in the 6 redundant value combinations.

Table 2 redundant RI and first indication information value combinations (the value range of the first indication information is 1,2, …, 2K)₀)

Redundancy fetchingValue combination	RI	Value corresponding to the first indication information
			1	2	1
2	3	1
			3	3	2
4	4	1
			5	4	2
6	4	3

If the value range of the first indication information is 0,1,2, …,2K₀(in this design, the value corresponding to the first indication information includes 0), table 3 lists all redundant RI and first indication information value combinations (10 redundant value combinations in total).

Table 3 redundant RI and first indication information value combinations (the value range of the first indication information is 0,1,2, …, 2K)₀)

Redundancy value combination	RI	Value corresponding to the first indication information
			1	1	0
2	2	0
			3	2	1
4	3	0
			5	3	1
6	3	2
			7	4	0
8	4	1
			9	4	2
10	4	3

The additional information may be implicitly indicated using a redundant RI and first indication information value combination as shown in table 2 or table 3. For example, one or more of the combinations of values of RI and the first indication information shown in table 2 or table 3 may be used to indicate one or more of the following information:

information 1: the number of spatial basis vectors L used to represent the network device configuration is small. When the network device receives the value combination of the corresponding RI and the first indication information indicated in the CSI component 1, a larger number of space-domain basis vectors (corresponding to the design 1.1 of the first indication information) is configured at the time of the next CSI measurement. For example, the number L of the space-domain basis vectors corresponding to the current CSI measurement is 2, and when the network device receives a value combination indicating the corresponding RI and the first indication information in the CSI component 1, a larger L value is configured when the CSI measurement is subsequently triggered, for example, L is 4.

Information 2: frequency domain basis vector quantity M for representing network equipment configuration_iOr the frequency domain basis vector proportion parameter p is smaller. When the network device receives the value combination of the corresponding RI and the first indication information indicated in the CSI component 1, a larger number of frequency-domain basis vectors or a larger ratio parameter of the frequency-domain basis vectors is configured at the next CSI measurement (corresponding to the design 1.2 of the first indication information). For example, when the frequency-domain basis vector proportion parameter p corresponding to the current CSI measurement is 1/4, and the network device receives a value combination indicating the corresponding RI and the first indication information in the CSI component 1, a larger p value is configured when the CSI measurement is subsequently triggered, for example, p is 1/2. A preset correspondence, such as a preset ratio, may exist between the larger value configured in the subsequent measurement and the smaller value corresponding to the current CSI measurement.

Information 3: number of space-frequency merging coefficients K for representing maximum reporting of network equipment configuration₀Or the space-frequency merging coefficient proportion parameter beta reported maximally is smaller. When the network device receives the value combination of the corresponding RI and the first indication information indicated in the CSI component 1, a larger number of space-frequency combining coefficients or a space-frequency combining coefficient ratio parameter (corresponding to the design 1.3 of the first indication information) is configured at the time of the next CSI measurement. For example, the space-frequency combining coefficient ratio parameter β corresponding to the current CSI measurement is 1/4, and when the network device receives the combination of the corresponding RI and the first indication information value indicated in the CSI component 1, a larger β value is configured when the CSI measurement is subsequently triggered, for example, β is 1/2. A preset correspondence, such as a preset ratio, may exist between the larger value configured in the subsequent measurement and the smaller value corresponding to the current CSI measurement.

And information 4: used to represent the current CSI reporting indication is the wideband PMI. Accordingly, Release 15 type II codebook wideband PMI (design 2.1 corresponding to the above-described first indication information and design 1 corresponding to the above-described second indication information) is indicated in the CSI portion 2.

And information 5: the PMI corresponding to the single beam codebook or the PMI corresponding to the number of fixed space-frequency combining coefficients is used for representing the current CSI report indication. Accordingly, only a preset number of space-base vectors and/or a preset number of space-frequency combining coefficients are indicated in the CSI section 2 (design 2.2 corresponding to the above-described first indication information and design 2 corresponding to the above-described second indication information).

And information 6: indicating that part of the space-frequency combining coefficients in the current CSI report part 2 are removed (design 2.3 corresponding to the first indication information and design 3 corresponding to the second indication information).

It should be noted that the above information may be combined with the RI and the first indication information shown in table 2 or table 3 to form various corresponding relationships. Accordingly, the indication content in the CSI portion 2 is also different. Specific examples are as follows:

taking table 2 as an example, the combination of RI and the first indication information value shown in table 4, table 5, and table 6 may be used to indicate other information contents.

In table 4, for each RI value, when the value corresponding to the first indication information is smaller than the rank value, it is used to indicate one of the information 1, the information 2, or the information 3.

Table 4 combination of values corresponding to RI and first indication information indicates other information content

In table 5, the combination of the values corresponding to the partial RI and the first indication information is used to indicate one of information 1, information 2, and information 3. The combination of the values corresponding to the different RIs and the first indication information may respectively represent information 1, information 2, and information 3.

Table 5 combination of values corresponding to RI and first indication information indicates other information content

Table 5 is only an example, and the meanings of the instructions corresponding to different RIs may be interchanged, and the present application is not limited thereto.

In table 6, the combination of values corresponding to the first indication information for each RI may be used to indicate information 1, information 2, and information 3.

Table 6 combination of values corresponding to RI and first indication information indicates other information content

Table 6 is merely an example, and the meanings of the instructions corresponding to different RIs may be interchanged, and the present application is not limited thereto.

At this time, the value of the RI indicated in the CSI component 1 or the value corresponding to the first indication information is meaningless, and therefore, the CSI component 2 cannot indicate PMI related information according to the existing protocol. When the RI value indicated in the CSI component 1 and the value corresponding to the first indication information are in one of tables 4 to 6, correspondingly, the CSI component 2 may only indicate PMI information at a fixed overhead.

In an implementation manner (corresponding to design 1.1 of the second indication information), when an RI value (i.e., a rank value) indicated in the CSI portion 1 and a value corresponding to the first indication information are in one of tables 4 to 6, the CSI portion 2 indicates wideband PMI information corresponding to a fixed rank value. The wideband PMI information may be Release 15 Type II codebook wideband PMI information. For example, CSI part 2 indicates rank 1 (i.e., R) ₀1) corresponding R15 type II codebook wideband PMI information. The second indication information contained in the CSI part 2 is shown in table 7.

Table 7 rank 1, CSI part 2 (second indication information) indicates R15 type II codebook wideband PMI information

The spatial basis vector oversampling factor, the spatial basis vector index, the strongest spatial basis vector corresponding to the first spatial layer, and the bit overhead occupied by the wideband amplitude corresponding to each spatial basis vector of the first spatial layer are shown in table 7, where the meaning of the alphabet may refer to the background or the foregoing description.

In an implementation manner (corresponding to design 1.2 of the second indication information), when the RI value indicated in the CSI portion 1 and the value corresponding to the first indication information are one of values in table 3, the CSI portion 2 indicates wideband PMI information, and the rank value corresponding to the wideband PMI is the rank value indicated by the RI in the CSI portion 1. The second indication information contained in the CSI part 2 for different ranks is shown in table 8.

Table 8 CSI part 2 (second indication information) indicating R15 type II codebook wideband PMI information

The spatial basis vector oversampling factor, the spatial basis vector index, the strongest spatial basis vector corresponding to each spatial layer, and the bit overhead occupied by the wideband amplitude corresponding to each spatial basis vector of each spatial layer are shown in table 8, where the meaning of the alphabet may refer to the background or the foregoing description.

In an implementation (corresponding to design 1 of the first indication information and design 2 of the second indication information), when the value of RI indicated in the CSI portion 1 and the value corresponding to the first indication information are one of table 2 or table 3 (tables 4 to 6 are specific implementations of table 3), correspondingly, single-beam PMI information may be indicated in the CSI portion 2. The CSI portion 2 comprises an indication of the spatial basis vector index, an indication of the oversampling factor of the spatial basis vector, and an indication of the corresponding wideband amplitude of the spatial basis vector in both polarization directions.

In an implementation manner (corresponding to design 1 of the first indication information and design 2.1 of the second indication information), when the RI value indicated in the CSI portion 1 and the value corresponding to the first indication information are in one of tables 4 to 6, the CSI portion 2 indicates the PMI information of the single-beam codebook corresponding to the fixed rank value. For example, the CSI part 2 indicates single beam codebook PMI information corresponding to rank ═ 1. The second indication information included in the CSI part 2 is shown as rank ═ 1 in table 9.

In another implementation manner (corresponding to design 1 of the first indication information and design 2.2 of the second indication information), when the value of RI indicated in the CSI portion 1 and the value corresponding to the first indication information are one of those in table 2, the CSI portion 2 indicates the single beam codebook PMI information, and the rank value corresponding to the single beam codebook PMI is the rank value indicated by the RI in the CSI portion 1. The second indication information contained in the CSI part 2 for different ranks is shown in table 9. For the single-beam codebooks shown in tables 9 and 10, each spatial layer corresponds to only one spatial basis vector per polarization direction. In one implementation, in each frequency domain unit of each spatial layer, the combining coefficients corresponding to the selected spatial basis vectors in the two polarization directions are normalized with reference to the combining coefficient with the larger amplitude in the combining coefficients corresponding to the two polarization directions. After normalization, the combining coefficient with larger amplitude is 1, so that reporting is not needed.

Table 9 CSI part 2 indicates single beam codebook PMI information

Table 9 shows the spatial basis vector oversampling factor, the spatial basis vector index, the wideband amplitude corresponding to the weak polarization direction of each spatial layer in the R spatial layers, the weak polarization direction indication corresponding to each spatial layer, the subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and the bit overhead occupied by the subband phase corresponding to the weak polarization direction of each subband in each spatial layer, where the meaning of the alphabet may refer to the background technology or the foregoing description. It should be noted that each spatial layer weak polarization direction indication in table 9 may also be each spatial layer strong polarization direction indication.

In one implementation (corresponding to design 1 of the first indication information and design 3 of the second indication information), when the value of RI indicated in CSI portion 1 and the value corresponding to the first indication information are one of table 2 or table 3, correspondingly, the CSI portion 2 may indicate the space-frequency compressed codebook PMI information corresponding to the fixed number of space-frequency combining coefficients.

Taking the number of space-frequency combining coefficients corresponding to each spatial layer as 2 in advance as an example, in an implementation manner (corresponding to the above design 1 of the first indication information and the design 3.1 of the second indication information), when the RI value indicated in the CSI portion 1 and the value corresponding to the first indication information are one of tables 4 to 6, the CSI portion 2 indicates PMI information of a fixed space-frequency combining coefficient corresponding to a fixed rank value. For example, CSI part 2 indicates rank 1 (i.e., R) ₀1) corresponding space-frequency compressed codebook PMI information, and each space layer only reports one spatial layer in each polarization directionSpace-frequency combining coefficient, the second indication information contained in CSI portion 2 is shown as rank 1 in table 10; for another example, the CSI portion 2 indicates space-frequency compressed codebook PMI information corresponding to rank ═ 2, and each spatial layer only reports one space-frequency combining coefficient in each polarization direction. The second indication information included in the CSI part 2 is shown as rank 2 in table 10.

In another implementation manner (corresponding to design 1 of the first indication information and design 3.2 of the second indication information), when the RI value indicated in the CSI portion 1 and the value corresponding to the first indication information are one of those in table 2, the CSI portion 2 indicates PMI information for a fixed number of space-frequency combining coefficients, and the rank value corresponding to the PMI for the fixed number of space-frequency combining coefficients is the rank value indicated by the RI in the CSI portion 1. The second indication information contained in the CSI part 2 for different ranks is shown in table 10.

Table 10 CSI part 2 indicates space frequency compression codebook PMI information, and each space layer reports a space frequency merging coefficient in each polarization direction

The spatial basis vector oversampling factor, the spatial basis vector index, the frequency domain basis vector corresponding to each spatial layer in each polarization direction, the weak polarization direction indication corresponding to each spatial layer, the amplitude value of the spatial frequency combining coefficient corresponding to each spatial layer in each polarization direction, and the bit overhead occupied by the phase value of the spatial frequency combining coefficient corresponding to each spatial layer in each polarization direction are shown in table 10, where the meaning of the letter may refer to the background technology or the foregoing description. It should be noted that each spatial layer weak polarization direction indication in table 10 may also be each spatial layer strong polarization direction indication. Taking table 3 as an example, the combination of values corresponding to RI and the first indication information shown in table 11 may be used to indicate the information 4 (corresponding to the design 2.1 of the first indication information), that is, the R15 type II codebook wideband PMI is indicated in part 2 of the current CSI report.

Table 11 combination of values corresponding to RI and first indication information indicates other information content

When the RI value indicated in the CSI portion 1 and the value corresponding to the first indication information are one of those in table 11, the CSI portion 2 indicates wideband PMI information, and the rank value corresponding to the wideband PMI is the rank value indicated by the RI in the CSI portion 1. The indication information contained in the CSI part2 for different ranks may be as shown in table 8.

In addition, the combination of values corresponding to RI and the first indication information is also used to indicate the above information 5 (corresponding to the above design 2.2 of the first indication information), that is, R15 type II codebook single beam PMI information is indicated in part2 of the current CSI report. When the RI value indicated in the CSI portion 1 and the value corresponding to the first indication information are one of the values in table 12, the CSI portion 2 indicates single beam codebook PMI information, and the rank value corresponding to the single beam codebook PMI information is the rank value indicated by the RI in the CSI portion 1. The second indication information contained in the CSI part2 for different ranks is shown in table 9.

Table 12 combination of values corresponding to RI and first indication information indicates other information content

Due to the limitation of UCI resources, when the CSI reporting overhead exceeds a preset threshold value, the terminal equipment is allowed to delete a part of space-frequency combination coefficients indicated in the CSI part2, so that the reporting overhead is adjusted to an allowable range. Taking table 3 as an example, the combination of the values corresponding to the RI and the first indication information shown in table 13 may be used to indicate whether the information 6, that is, the space-frequency merging coefficient information indicated in part2 of the current CSI report, is partially deleted. The indication information can help the network device to know whether the uplink resource allocation is appropriate or not so as to adjust and meet the reporting requirement in time.

Table 13 RI indicates other information contents by combination of values corresponding to the first indication information

When the RI value indicated in the CSI portion 1 and the value corresponding to the first indication information are in one of tables 13, the CSI portion 2 may indicate wideband PMI information as shown in table 8, may also be single-beam PMI information as shown in table 9, and may also be compressed codebook PMI information that fixes space-frequency combining coefficients as shown in table 10.

The above design schemes and embodiments thereof have the following beneficial effects:

1) according to the design scheme 1 (specifically including the design schemes 1.1-1.3) of the first indication information, through special value combination of the RI and the first indication information in the CSI portion 1, the codebook quantization parameter configured by the current network device can be indicated to be smaller without additionally introducing indication information or expanding field overhead, so that the network device is facilitated to know the current downlink channel state information, and the CSI measurement configuration parameter is adjusted in time, thereby improving the CSI measurement accuracy. In addition, since the CSI part 2 indicates PMI information (such as wideband PMI) with fixed overhead, the overhead of part 2 does not need to be indicated by the CSI part 1. Therefore, the scheme of the invention can report low-precision PMI information while indicating that the codebook quantization parameter configured by the current network equipment is smaller, and fully utilizes the reference signal resource. In the current R15 type II codebook, rank ═ 2 is supported only at maximum. For the R16 space-frequency compression codebook, although the maximum rank is supported to be 4, no wideband PMI is currently defined. Therefore, the current reporting method of the R16 space-frequency compressed codebook PMI is not suitable for wideband PMI reporting.

2) Aiming at the design scheme 2.1 of the first indication information, the current reporting information is implicitly indicated to be the wideband PMI through the special value combination of the RI field and the first indication information field in the CSI part 1, so that the same CSI part 1 format can be adopted with the non-wideband PMI of the space-frequency compression codebook, and a design scheme is provided for the reporting format of the wideband PMI of the space-frequency compression codebook.

3) Aiming at the design scheme 2.2 of the first indication information, the current reported information is implicitly indicated to be a single beam PMI through the special value combination of an RI field and a first indication information field in the CSI part 1. The single-beam PMI is equivalent to an R15 TypeI codebook, so that the CSI feedback requirement under a low-overhead scene is better met.

4) And aiming at the design scheme 2.3 of the first indication information, the deletion of the space-frequency merging coefficient reported in the current CSI part 2 is implicitly indicated through the special value combination of the RI in the CSI part 1 and the first indication information. Therefore, the scheme of the invention can indicate that the uplink resources allocated by the current network equipment are insufficient under the condition of not additionally introducing indication information or expanding field overhead, thereby being beneficial to the network equipment to adjust the uplink resource allocation in time, improving the accuracy of CSI measurement and ensuring the system performance.

In summary, according to the present disclosure, according to the current space-frequency compression codebook CSI reporting format, the CSI portion 1 indicates rank of a PMI reported by a CSI report and first indication information. However, since each spatial layer reports at least one space-frequency combining coefficient, at present, there is a meaningless value combination in all the value combinations of the two fields. In addition, currently, the space-frequency compression codebook has no indication information for indicating whether the current codebook parameters are suitable or not or whether the uplink resource allocation is suitable or not to the network device. When the codebook parameters or uplink resources are not allocated sufficiently, the reported CSI information is not accurate enough, thereby affecting the system performance. For this reason, the solution presented in the present application has the following improvements compared to the prior art:

1) and by using the redundancy value combination of the RI in the CSI part 1 and the first indication information, whether the codebook parameters configured by the current network equipment are suitable or not or whether the uplink resources configured by the current network equipment are enough are implicitly indicated, so that the parameter configuration or the uplink resource configuration of the network equipment is guided under the condition of not additionally introducing the indication information or expanding the field overhead, and the system performance is improved.

2) And according to the current CSI reporting format, the number of the space-frequency merging coefficients contained in the CSI part 2 completely corresponds to the number indicated in the CSI part 1. When the value combination of the RI and the first indication information in the CSI portion 1 implicitly indicates other indication information, the CSI portion 2 cannot accurately indicate PMI information according to the current protocol scheme. In the scheme of the application, the CSI part 2 indicates PMI information and the number of space-frequency merging coefficients indicated in the CSI part 1 is decoupled. The CSI part 2 indicates a PMI of fixed overhead such as a wideband PMI or a single beam PMI, etc. The problem that the current CSI report can not carry PMI information is avoided, and the current CSI reference signal resource is utilized to the maximum extent.

3) The current space-frequency compression codebook does not define the wideband PMI, and the current CSI part 2 format is adopted to indicate that the wideband PMI information has large overhead waste. The scheme of the application provides a new design for indicating the wideband PMI by the CSI part 2, and the wideband PMI and the PMI indication of the current space frequency compression codebook sub-band adopt a compatible CSI part 1 format.

Based on the above various designs for the first indication information and the second indication information, the present application provides a communication method, as shown in fig. 2, the method includes the following steps:

In step 201, the terminal device determines the first indication information and the second indication information.

In step 202, the terminal device sends CSI to the network device, and accordingly, the network device may receive the CSI.

The CSI part 1 of the CSI includes the first indication information, and the CSI part 2 of the CSI includes the second indication information.

The specific meanings of the first indication information and the second indication information may refer to the description of the above embodiments, and are not repeated here.

Step 203, the network device determines the downlink channel state information according to the CSI.

The downlink channel state information may be, for example, an optimal precoding matrix corresponding to downlink data transmission, a downlink CQI, a better configuration parameter corresponding to downlink channel measurement, a better uplink resource corresponding to downlink channel measurement feedback, and the like.

Based on the embodiment, the redundancy value combination of the RI in the CSI portion 1 and the first indication information is utilized to implicitly indicate whether the codebook parameters configured by the current network device are appropriate or whether the uplink resources configured by the current network device are sufficient, and the second indication information of the CSI portion 2 indicates the PMI information in the predefined format, so that the parameter configuration or the uplink resource configuration of the network device is guided without additionally introducing the indication information or expanding the field overhead, which is helpful for improving the system performance.

The above-mentioned scheme provided by the present application is mainly introduced from the perspective of interaction between network elements. It is to be understood that the above-described implementation of each network element includes, in order to implement the above-described functions, a corresponding hardware structure and/or software module for performing each function. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, with the exemplary elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

As shown in fig. 3, which is a possible exemplary block diagram of a communication device according to the present application, the device 300 may be in the form of software or hardware. The apparatus 300 may comprise: a processing unit 302 and a communication unit 303. As an implementation, the communication unit 303 may include a receiving unit and a transmitting unit. The processing unit 302 is used for controlling and managing the operation of the apparatus 300. The communication unit 303 is used to support communication of the apparatus 300 with other network entities. The apparatus 300 may further comprise a storage unit 301 for storing program codes and data of the apparatus 300.

The processing unit 302 may be a processor or a controller, and may be, for example, a general-purpose Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processing (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The storage unit 301 may be a memory. The communication unit 303 is an interface circuit of the apparatus for receiving signals from other apparatuses. For example, when the device is implemented in the form of a chip, the communication unit 303 is an interface circuit for the chip to receive a signal from another chip or device, or an interface circuit for the chip to transmit a signal to another chip or device.

The apparatus 300 may be a terminal device in any of the above embodiments, and may also be a chip for a terminal device. For example, when the apparatus 300 is a terminal device, the processing unit 302 may be a processor, for example, and the communication unit 303 may be a transceiver, for example. Optionally, the transceiver may comprise radio frequency circuitry and the storage unit may be, for example, a memory. For example, when the apparatus 300 is a chip for a terminal device, the processing unit 302 may be a processor, for example, and the communication unit 303 may be an input/output interface, a pin, a circuit, or the like, for example. The processing unit 302 can execute computer executable instructions stored in a storage unit, optionally, the storage unit is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit can also be a storage unit located outside the chip in the terminal device, such as a read-only memory (ROM) or another type of static storage device that can store static information and instructions, a Random Access Memory (RAM), and the like.

In an embodiment, the apparatus 300 is a terminal device, and the processing unit 302 is configured to determine first indication information and second indication information; a communication unit 303, configured to transmit channel state information CSI to a network device, where the CSI includes a CSI part 1 and a CSI part 2, the CSI part 1 includes a rank indication and the first indication information, and the CSI part 2 includes the second indication information Indication information; the rank indication and the first indication information are used for indicating that precoding matrix PMI configuration parameters are insufficient and/or indicating PMI format information, the rank value corresponding to the rank indication is R, and the value corresponding to the first indication information is smaller than

R is the number of spatial layers, α_iThe minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer in the R space layers is R, alpha_iThe second indication information is used for indicating PMI information in a predefined format.

the number of the space domain base vectors configured by the network equipment is small, the number of the frequency domain base vectors configured by the network equipment is small, or the proportion parameters of the frequency domain base vectors are small, the number of the maximum reported space-frequency merging coefficients is small, or the proportion parameters of the maximum reported space-frequency merging coefficients are small.

Based on the first possible implementation method, as an implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is wideband PMI information corresponding to a fixed rank value. Optionally, the fixed rank value is R ₀The wideband PMI information includes one or more of the following information: spatial basis vector oversampling factor, spatial basis vector index, R₀And indicating the strongest space-domain basis vector corresponding to each space layer in the space layers and the broadband amplitude corresponding to each space-domain basis vector in each space layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is single-beam PMI information corresponding to a fixed rank value. Optionally, the fixed rank value is R ₀The single beam PMI information includes one or more of the following information: spatial basis vector oversampling factor, a spatial basis vector index, the R₀The method includes indicating a weak polarization direction corresponding to each spatial layer in each spatial layer, a wideband amplitude corresponding to the weak polarization direction of each spatial layer, a subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and a subband phase corresponding to the weak polarization direction of each subband in each spatial layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is single-beam PMI information, and the rank value corresponding to the single-beam PMI information is the R. Optionally, the single beam PMI information includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the weak polarization direction indication corresponding to each spatial layer in the R spatial layers, the broadband amplitude corresponding to the weak polarization direction of each spatial layer, the subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and the subband phase corresponding to the weak polarization direction of each subband in each spatial layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients corresponding to a fixed rank value. Optionally, the fixed rank value is R₀The PMI information of the fixed number of space-frequency combining coefficients includes one or more of the following information: space domain base directionMeasure oversampling factor, space-domain basis vector index, R₀The spatial frequency combination method comprises the following steps of a frequency domain base vector corresponding to each spatial layer in each polarization direction, an amplitude value of a space-frequency combination coefficient corresponding to each spatial layer in each polarization direction, and a phase value of the space-frequency combination coefficient corresponding to each spatial layer in each polarization direction.

It can be understood that, when the apparatus is used in the foregoing communication method, specific implementation procedures and corresponding beneficial effects may refer to the related description in the foregoing method embodiment, and are not described herein again.

As shown in fig. 4, which is a possible exemplary block diagram of a communication device according to the present application, the device 400 may be in the form of software or hardware. The apparatus 400 may include: a processing unit 402 and a communication unit 403. As an implementation, the communication unit 403 may include a receiving unit and a transmitting unit. The processing unit 402 is used for controlling and managing the operation of the apparatus 400. The communication unit 403 is used to support communication of the apparatus 400 with other network entities. The apparatus 400 may further comprise a storage unit 401 for storing program codes and data of the apparatus 400.

The processing unit 402 may be a processor or a controller, and may be, for example, a CPU, a general purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The storage unit 401 may be a memory. The communication unit 403 is an interface circuit of the apparatus for receiving signals from other apparatuses. For example, when the device is implemented in the form of a chip, the communication unit 403 is an interface circuit for the chip to receive signals from other chips or devices, or an interface circuit for the chip to transmit signals to other chips or devices.

The apparatus 400 may be a network device in any of the above embodiments, and may also be a chip for a network device. For example, when the apparatus 400 is a network device, the processing unit 402 may be a processor, and the communication unit 403 may be a transceiver, for example. Optionally, the transceiver may comprise radio frequency circuitry and the storage unit may be, for example, a memory. For example, when the apparatus 400 is a chip for a network device, the processing unit 402 may be a processor, for example, and the communication unit 403 may be an input/output interface, a pin, a circuit, or the like, for example. The processing unit 402 can execute computer-executable instructions stored in a storage unit, which may alternatively be a storage unit in the chip, such as a register, a cache, etc., or a storage unit located outside the chip in the network device, such as a ROM or other types of static storage devices that can store static information and instructions, a RAM, etc.

In one embodiment, the apparatus 400 is a network device, and the communication unit 403 is configured to receive channel state information CSI from a terminal device, where the CSI includes a CSI part 1 and a CSI part 2, the CSI part 1 includes a rank indication and first indication information, the CSI part 2 includes second indication information, the rank indication and the first indication information are used to indicate that a precoding matrix PMI configuration parameter is insufficient and/or to indicate PMI format information, a rank value corresponding to the rank indication is R, and a value corresponding to the first indication information is smaller than a value corresponding to the first indication information

R is the number of spatial layers, α_iThe minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer in the R space layers is R, alpha_iThe second indication information is used for indicating PMI information in a predefined format; a processing unit 402, configured to determine downlink channel state information according to the CSI.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is single-beam PMI information corresponding to a fixed rank value. Optionally, the fixed rank value is R₀The single beam PMI information includes one or more of the following information: spatial basis vector oversampling factor, a spatial basis vector index, R ₀The method includes indicating a weak polarization direction corresponding to each spatial layer in each spatial layer, a wideband amplitude corresponding to the weak polarization direction of each spatial layer, a subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and a subband phase corresponding to the weak polarization direction of each subband in each spatial layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is single-beam PMI information, and the rank value corresponding to the single-beam PMI information is the R. Optionally, the single beam PMI information includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the weak polarization direction indication corresponding to each spatial layer of the R spatial layers, the broadband amplitude corresponding to the weak polarization direction, the subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and the subband phase corresponding to the weak polarization direction of each subband in each spatial layer.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients corresponding to a fixed rank value. Optionally, the fixed rank value is R ₀The PMI information of the fixed number of space-frequency combining coefficients includes one or more of the following information: spatial basis vector oversampling factor, spatial basis vector index, R₀The spatial frequency combination method comprises the following steps of a frequency domain base vector corresponding to each spatial layer in each polarization direction, an amplitude value of a space-frequency combination coefficient corresponding to each spatial layer in each polarization direction, and a phase value of the space-frequency combination coefficient corresponding to each spatial layer in each polarization direction.

Based on the first possible implementation method, as another implementation method, the value corresponding to the first indication information includes zero, the PMI information in the predefined format is PMI information of a fixed number of space-frequency and space-frequency combining coefficients, and the rank value corresponding to the PMI information of the fixed number of space-frequency combining coefficients is R. Optionally, the PMI information of the fixed number of space-frequency merging coefficients includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the frequency domain basis vector corresponding to each of the R spatial layers in each polarization direction, the amplitude value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction, and the phase value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction.

As shown in fig. 5, a schematic diagram of a communication apparatus provided in the present application is shown, where the apparatus may be a terminal device or a network device in the foregoing embodiments. The apparatus 500 comprises: a processor 502, a communication interface 503, and a memory 501. Optionally, the apparatus 500 may also include a communication line 504. Wherein, the communication interface 503, the processor 502 and the memory 501 may be connected to each other through a communication line 504; the communication line 504 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication lines 504 may be divided into address buses, data buses, control buses, and the like. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.

Processor 502 may be a CPU, microprocessor, ASIC, or one or more integrated circuits configured to control the execution of programs in accordance with the teachings of the present application.

The communication interface 503 may be any device, such as a transceiver, for communicating with other devices or communication networks, such as an ethernet, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), a wired access network, and the like.

The memory 501 may be, but is not limited to, a ROM or other type of static storage device that can store static information and instructions, a RAM or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a CD-ROM or other optical disk storage, an optical disk storage (including a compact disk, a laser disk, an optical disk, a digital versatile disk, a blu-ray disk, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be separate and coupled to the processor via a communication line 504. The memory may also be integral to the processor.

The memory 501 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 502 to execute. The processor 502 is configured to execute computer-executable instructions stored in the memory 501, so as to implement the communication method provided by the above-mentioned embodiment of the present application.

Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

Those of ordinary skill in the art will understand that: the various numbers of the first, second, etc. mentioned in this application are only used for the convenience of description and are not used to limit the scope of the embodiments of this application, but also to indicate the sequence. "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. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one" means one or more. At least two means two or more. "at least one," "any," or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one (one ) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple. "plurality" means two or more, and other terms are analogous. Furthermore, for elements (elements) that appear in the singular form "a," an, "and" the, "they are not intended to mean" one or only one "unless the context clearly dictates otherwise, but rather" one or more than one. For example, "a device" means for one or more such 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 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 including one or more available media integrated servers, data centers, and the like. 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 various illustrative logical units and circuits described in this application may be implemented or operated upon by design of a general purpose processor, a digital signal processor, 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, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include such modifications and variations.

Claims

1. A method of communication, comprising:

the terminal equipment determines first indication information and second indication information;

the terminal equipment sends Channel State Information (CSI) to network equipment, wherein the CSI comprises a CSI part 1 and a CSI part 2, the CSI part 1 comprises a rank indication and the first indication information, and the CSI part 2 comprises the second indication information;

the rank indication and the first indication information are used for indicating that a precoding matrix indicates that a PMI configuration parameter is insufficient and/or indicating PMI format information, a rank value corresponding to the rank indication is R, and a value corresponding to the first indication information is smaller than

R is the number of spatial layers, α_iThe minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer in the R space layers is R, alpha_iAre all positive integers, and the second indication information is used for indicating predefinitionPMI information of the format.

2. A method of communication, comprising:

the method comprises the steps that a network device receives Channel State Information (CSI) from a terminal device, the CSI comprises a CSI part 1 and a CSI part 2, the CSI part 1 comprises rank indication and first indication information, the CSI part 2 comprises second indication information, the rank indication and the first indication information are used for indicating that Precoding Matrix (PMI) configuration parameters are insufficient and/or indicating PMI format information, the rank value corresponding to the rank indication is R, and the value corresponding to the first indication information is smaller than the value corresponding to the first indication information

R is the number of spatial layers, α_iThe minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer in the R space layers is R, alpha_iThe second indication information is used for indicating PMI information in a predefined format;

and the network equipment determines the state information of the downlink channel according to the CSI.

3. A communications apparatus, comprising:

a processing unit for determining first indication information and second indication information;

a communication unit, configured to send channel state information CSI to a network device, where the CSI includes a CSI part 1 and a CSI part 2, the CSI part 1 includes a rank indication and the first indication information, and the CSI part 2 includes the second indication information;

the rank indication and the first indication information are used for indicating that precoding matrix PMI configuration parameters are insufficient and/or indicating PMI format information, the rank value corresponding to the rank indication is R, and the value corresponding to the first indication information is smaller than

R is the number of spatial layers, α_iIn R spatial layersThe minimum value of the number of space-frequency merging coefficients corresponding to the ith space layer, R, alpha_iThe second indication information is used for indicating PMI information in a predefined format.

4. A communications apparatus, comprising:

a communication unit, configured to receive channel state information CSI from a terminal device, where the CSI includes a CSI portion 1 and a CSI portion 2, the CSI portion 1 includes a rank indication and first indication information, and the CSI portion 2 includes second indication information, where the rank indication and the first indication information are used to indicate that a precoding matrix PMI configuration parameter is insufficient and/or to indicate PMI format information, a rank value corresponding to the rank indication is R, and a value corresponding to the first indication information is smaller than a value corresponding to the first indication information

and the processing unit is used for determining the state information of the downlink channel according to the CSI.

5. The method and apparatus as claimed in any one of claims 1-4, wherein the rank indication and the first indication information are used to indicate that there is insufficient PMI configuration parameters, and the insufficient PMI configuration parameters are one of:

increasing the number of the space domain basic vectors configured by the network equipment, increasing the number of the frequency domain basic vectors configured by the network equipment or increasing the proportion parameters of the frequency domain basic vectors, increasing the number of the maximum reported space-frequency combination coefficients or increasing the proportion parameters of the maximum reported space-frequency combination coefficients.

6. The method and apparatus of claim 5, wherein a value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is wideband PMI information corresponding to a fixed rank value.

7. The method, apparatus, of claim 6, in which the fixed rank value is R₀The wideband PMI information includes one or more of the following information: spatial basis vector oversampling factor, spatial basis vector index, R₀And indicating the strongest space-domain basis vector corresponding to each space layer in the space layers and the broadband amplitude corresponding to each space-domain basis vector in each space layer.

8. The method and apparatus of claim 5, wherein a value corresponding to the first indication information includes zero, the PMI information in the predefined format is wideband PMI information, and a rank value corresponding to the wideband PMI information is R.

9. The method, apparatus of claim 8, wherein the wideband PMI information includes one or more of the following information: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the strongest spatial domain basis vector indication corresponding to each spatial layer in the R spatial layers, and the broadband amplitude corresponding to each spatial domain basis vector in each spatial layer.

10. The method and apparatus of claim 5, wherein a value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is single-beam PMI information corresponding to a fixed rank value.

11. The method, apparatus, of claim 10, in which the fixed rank value is R₀The single beam PMI information includes one or more of the following information: spatial basis vector oversampling factor, a spatial basis vector index, R₀Indication of the direction of weak polarization for each of the spatial layers, the magnitude of the wideband for the direction of weak polarization for each of the spatial layers, and the magnitude of the wideband for each subband in the spatial layerThe weak polarization direction corresponds to the subband differential amplitude and the subband phase of each subband in the weak polarization direction of each spatial layer.

12. The method and apparatus of claim 5, wherein a value corresponding to the first indication information includes zero, the PMI information in the predefined format is PMI information in a single beam, and a rank value corresponding to the PMI information in the single beam is R.

13. The method, apparatus of claim 12, wherein the single beam PMI information includes one or more of: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the weak polarization direction indication corresponding to each spatial layer in the R spatial layers, the broadband amplitude corresponding to the weak polarization direction of each spatial layer, the subband differential amplitude corresponding to the weak polarization direction of each subband in each spatial layer, and the subband phase corresponding to the weak polarization direction of each subband in each spatial layer.

14. The method and apparatus of claim 5, wherein a value corresponding to the first indication information does not include zero, and the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients corresponding to a fixed rank value.

15. The method, apparatus, and/or storage medium of claim 14, wherein the fixed rank value is R₀The PMI information of the fixed number of space-frequency combining coefficients includes one or more of the following information: spatial basis vector oversampling factor, spatial basis vector index, R₀The spatial frequency combination method comprises the following steps of a frequency domain base vector corresponding to each spatial layer in each polarization direction, an amplitude value of a space-frequency combination coefficient corresponding to each spatial layer in each polarization direction, and a phase value of the space-frequency combination coefficient corresponding to each spatial layer in each polarization direction.

16. The method and apparatus of claim 5, wherein the value corresponding to the first indication information includes zero, the PMI information in the predefined format is PMI information of a fixed number of space-frequency combining coefficients, and a rank value corresponding to the PMI information of the fixed number of space-frequency combining coefficients is R.

17. The method, apparatus of claim 16, wherein PMI information for the fixed number of space-frequency combining coefficients comprises one or more of: the spatial domain basis vector oversampling factor, the spatial domain basis vector index, the frequency domain basis vector corresponding to each of the R spatial layers in each polarization direction, the amplitude value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction, and the phase value of the spatial frequency combining coefficient corresponding to each of the R spatial layers in each polarization direction.

18. The method and apparatus of any one of claims 1 to 4, wherein the rank indication and the first indication information are used to indicate PMI format information, the PMI format information includes a rank value corresponding to the rank indication and third indication information, the third indication information is used to indicate that wideband PMI information is reported by the CSI, PMI information in a predefined format is wideband PMI information, and the rank value corresponding to the wideband PMI information is the R; alternatively, the first and second electrodes may be,