CN113972938B

CN113972938B - Communication method and device

Info

Publication number: CN113972938B
Application number: CN202010725090.6A
Authority: CN
Inventors: 余健; 苏立焱; 余雅威; 郭志恒
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2023-08-22
Anticipated expiration: 2040-07-24
Also published as: CN113972938A; WO2022017325A1

Abstract

The embodiment of the application discloses a communication method and a communication device. The method comprises the following steps: the method comprises the steps that terminal equipment receives precoding indication information from network equipment, wherein the precoding indication information comprises a corresponding relation between a rotation phase value and a sounding reference signal resource index SRI; determining a first SRI configured by the network equipment for the terminal equipment; determining a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI; receiving a channel state information reference signal (CSI-RS) from the network equipment; and determining a rotated precoding matrix according to the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value. By adopting the embodiment of the application, the transmission performance of the MIMO system can be improved, and the uplink capacity can be improved.

Description

Communication method and device

Technical Field

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

Background

In a fifth generation (5G) communication system, uplink precoding includes a codebook-based transmission mode and a non-codebook-based transmission mode. In the codebook-based transmission mode, the base station selects an appropriate codebook from a predefined set of uplink codebooks according to the channel state and indicates the index of the selected codebook to the terminal through a control channel. In a non-codebook based transmission mode, the base station selects an appropriate sounding reference signal resource index (sounding reference signal resource index, SRI) according to the channel state and indicates the SRI to the terminal through a control channel. When uplink non-codebook transmission is performed, only channel information of a single user is considered in uplink precoding, so that interference among multiple users cannot be effectively restrained when the base stations are paired by multiple users, transmission performance of an uplink multiple-input multiple-output (MIMO) system is reduced, and uplink capacity is limited.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, which can improve the transmission performance of a MIMO system and the uplink capacity.

In a first aspect, an embodiment of the present application provides a communication method, including: the terminal equipment receives precoding indication information from the network equipment, wherein the precoding indication information comprises a corresponding relation between a rotation phase value and a sounding reference signal resource index SRI; determining a first SRI configured by the network equipment as the terminal equipment; determining a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI; receiving a channel state information reference signal (CSI-RS) from a network device; and determining the rotated precoding matrix according to the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value.

One or more rotated precoding matrices are generated by the terminal equipment and transmitted to the network equipment through the coded SRS. When the network equipment performs multi-user pairing, the channel information and inter-cell interference information of the users in the whole cell can be obtained, and the optimal precoding matrix of the paired users is selected, so that the interference during multi-user pairing is effectively restrained or reduced. The terminal equipment performs data mapping according to the optimal precoding matrix and then transmits the data, so that the transmission performance of the MIMO system can be improved, and the uplink capacity can be improved.

Wherein the first SRI may comprise one or more SRIs and, correspondingly, the first rotational phase value may comprise one or more rotational phase values. Each of the first SRIs may correspond to a first rotational phase value. The number of first SRIs may be the same as the number of first rotational phase values.

In one possible design, the rotated precoding matrix is sent to the network device on the resource corresponding to the first SRI, i.e., the SRS weighted by the rotated precoding matrix is sent to the network device on the resource corresponding to the first SRI. By sending the rotated precoding matrix to the network equipment, the network equipment can acquire the channel information and inter-cell interference information of the users in the whole cell when performing multi-user pairing, and select the optimal precoding matrix of the paired users, so that interference during multi-user pairing is effectively suppressed or reduced.

In another possible design, the terminal device receives downlink control information from the network device, where the downlink control information includes a second SRI; and determining a second precoding matrix corresponding to a second SRI according to the corresponding relation between the rotation phase value and the SRI, wherein the second SRI is one value in the first SRI. The terminal equipment performs data mapping through the second precoding matrix and then transmits the data, so that the transmission performance of the MIMO system can be improved, and the uplink capacity can be improved.

In another possible design, the rotational phase values include at least one of rotational phase values in a horizontal dimension, rotational phase values in a vertical dimension, and rotational phase values in other dimensions. And carrying out phase rotation by selecting rotation phase values in different dimensions, so that the rotated precoding matrix reaches the optimal.

In a second aspect, an embodiment of the present application provides a communication method, including: the network equipment sends precoding indication information to the terminal equipment, wherein the precoding indication information comprises a corresponding relation between a rotation phase value and a sounding reference Signal Resource Index (SRI), the network equipment configures a first SRI for the terminal equipment, and the network equipment determines that the first SRI corresponds to the first rotation phase value according to the corresponding relation between the rotation phase value and the SRI; and sending a channel state information reference signal (CSI-RS) to the terminal equipment, wherein an uplink precoding matrix and a first rotation phase value corresponding to the CSI-RS are used for determining the rotated precoding matrix.

And sending precoding indication information to the terminal equipment through the network equipment, generating 1 or more rotated precoding matrixes by the terminal equipment, and sending the precoding matrixes to the network equipment through the coded SRS. When the network equipment performs multi-user pairing, the channel information and inter-cell interference information of the users in the whole cell can be obtained, and the optimal precoding matrix of the paired users is selected, so that the interference during multi-user pairing is effectively restrained or reduced. The terminal equipment performs data mapping according to the optimal precoding matrix and then transmits the data, so that the transmission performance of the MIMO system can be improved, and the uplink capacity can be improved.

In one possible design, the rotated precoding matrix sent by the terminal device is received on a resource corresponding to the first SRI. When the network equipment performs multi-user pairing, the channel information and inter-cell interference information of the users in the whole cell can be obtained, and the optimal precoding matrix of the paired users is selected, so that the interference during multi-user pairing is effectively restrained or reduced.

In another possible design, the network device sends downlink control information to the terminal device, where the downlink control information includes a second SRI, where the second SRI is used by the terminal device to determine a second precoding matrix according to a correspondence between a rotation phase value and a sounding reference signal resource index SRI, and the second SRI is one value in the first SRI. The terminal equipment performs data mapping according to the second precoding matrix and then transmits the data, so that the transmission performance of the MIMO system can be improved, and the uplink capacity can be improved.

In another possible design, the rotational phase values include at least one of rotational phase values in a horizontal dimension, rotational phase values in a vertical dimension, and rotational phase values in other dimensions. The terminal equipment performs data mapping through the second precoding matrix and then transmits the data, so that the transmission performance of the MIMO system can be improved, and the uplink capacity can be improved.

In a third aspect, an embodiment of the present application provides a communication method, including: the terminal equipment sends the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix to the network equipment; receiving downlink control information from the network device, wherein the downlink control information comprises indication information of a rotation phase value; and determining the rotated precoding matrix according to the rotation phase value corresponding to the indication information of the rotation phase value and the first precoding matrix.

The terminal equipment transmits the coded SRS and the non-coded SRS to the network equipment, and the network equipment determines a rotation phase value according to the coded SRS and the non-coded SRS, so that when the multi-user pairing is carried out, the channel information and the inter-cell interference information of the users in the whole cell can be obtained, and the interference when the multi-user pairing is carried out is effectively restrained or reduced. After receiving the rotation phase value, the terminal equipment can rotate the precoding matrix according to the rotation phase value, and then perform data mapping according to the rotated precoding matrix and then transmit the data, thereby improving the transmission performance of the MIMO system and improving the uplink capacity.

In one possible design, the terminal device receives precoding indication information from the network device, the precoding indication information comprising a set of rotational phase values, the indication information of rotational phase values being used to determine rotational phase values from the set of rotational phase values. And determining the rotated precoding matrix by indicating the rotation phase value set, and carrying out data mapping according to the rotated precoding matrix and then transmitting, thereby improving the transmission performance of the MIMO system and the uplink capacity.

In one possible design, a terminal device receives a channel state information reference signal, CSI-RS, from a network device; and determining a channel characteristic vector according to the CSI-RS, wherein the channel characteristic vector is used for determining a first precoding matrix. And transmitting the coded SRS weighted by the first precoding matrix through the determined first precoding matrix, so that the network equipment can determine the rotation phase value, and interference during multiuser pairing is effectively suppressed or reduced.

In one possible design, the downlink control information further includes a sounding reference signal resource index SRI; and the terminal equipment determines a first precoding matrix according to the SRI. And determining a first precoding matrix through SRI so as to determine the rotated precoding matrix, thereby improving the transmission performance of the MIMO system and the uplink capacity.

In a fourth aspect, an embodiment of the present application provides a communication method, including: the network equipment receives the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix from the terminal equipment; determining a rotation phase value of the precoding matrix according to the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix; and sending downlink control information to the terminal equipment, wherein the downlink control information comprises indication information of rotation phase values, and the rotation phase values corresponding to the indication information of the rotation phase values are used for determining a rotated precoding matrix by the terminal equipment according to the first precoding matrix.

The network device receives the encoded SRS and the non-encoded SRS, determines the rotation phase value according to the encoded SRS and the non-encoded SRS, and can acquire the channel information and the inter-cell interference information of the users in the whole cell when the users are paired, thereby effectively inhibiting or reducing the interference when the users are paired. After receiving the rotation phase value, the terminal equipment can rotate the precoding matrix according to the rotation phase value, and then perform data mapping according to the rotated precoding matrix and then transmit the data, thereby improving the transmission performance of the MIMO system and improving the uplink capacity.

In one possible design, the network device sends a precoding indication information to the terminal device, the precoding indication information comprising a set of rotational phase values, the indication information of the rotational phase values being used by the terminal device to determine the rotational phase values from the set of rotational phase values. And determining the rotated precoding matrix by indicating the rotation phase value set, and carrying out data mapping according to the rotated precoding matrix and then transmitting, thereby improving the transmission performance of the MIMO system and the uplink capacity.

In another possible design, the network device sends a channel state information reference signal CSI-RS to the terminal device, the CSI-RS being used by the terminal device to determine a channel eigenvector, the channel eigenvector being used to determine the first precoding matrix. And transmitting the coded SRS weighted by the first precoding matrix through the determined first precoding matrix, so that the network equipment can determine the rotation phase value, and interference during multiuser pairing is effectively suppressed or reduced.

In another possible design, the downlink control information further includes a sounding reference signal resource index SRI, where the SRI is used by the terminal device to determine the first precoding matrix. And determining a first precoding matrix through SRI so as to determine the rotated precoding matrix, thereby improving the transmission performance of the MIMO system and the uplink capacity.

In a fifth aspect, an embodiment of the present application provides a communication apparatus configured to implement the methods and functions performed by the terminal device in the first and third aspects, and implemented by hardware/software, where the hardware/software includes modules corresponding to the functions.

In a sixth aspect, an embodiment of the present application provides a communications apparatus configured to implement the methods and functions performed by the network devices in the second and fourth aspects, where the methods and functions are implemented by hardware/software, and the hardware/software includes modules corresponding to the functions.

In a seventh aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus is applied to a terminal device, and the communication apparatus may be the terminal device or a chip in the terminal device, and the communication apparatus includes: the system comprises a processor, a memory and a communication bus, wherein the communication bus is used for realizing connection communication between the processor and the memory, and the processor executes a program stored in the memory for realizing the steps of the first aspect and the third aspect.

In an eighth aspect, an embodiment of the present application provides a communication apparatus, where the communication apparatus is applied to a network device, and the communication apparatus may be the network device or a chip in the network device, and the communication apparatus includes: the device comprises a processor, a memory and a communication bus, wherein the communication bus is used for realizing connection communication between the processor and the memory, and the processor executes a program stored in the memory for realizing the steps of the second aspect and the fourth aspect.

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

In a tenth aspect, the application 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, an embodiment of the present application provides a chip, including a processor configured to call from a memory and execute instructions stored in the memory, so that a communication device on which the chip is mounted performs the method of any one of the above aspects.

In a twelfth aspect, an embodiment of the present application provides another chip, including: the input interface, the output interface, the processor, and optionally, a memory, where the input interface, the output interface, the processor, and the memory are connected by an internal connection path, the processor is configured to execute a code in the memory, and when the code is executed, the processor is configured to execute a method in any of the foregoing aspects.

In a thirteenth aspect, an embodiment of the present application provides a communication system, which includes at least one terminal device for performing the steps in the first aspect and the third aspect, and at least one network device for performing the steps in the second aspect and the fourth aspect.

Drawings

In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

FIG. 2 is a flow chart of a non-codebook based precoding determination methodology;

FIG. 3 is a schematic flow chart of a communication method according to an embodiment of the present application;

FIG. 4 is a flow chart of another communication method according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

As shown in fig. 1, fig. 1 is a schematic architecture diagram of a communication system 100 according to an embodiment of the present application. The communication system 100 may include a network device 110 and terminal devices 101-106. It should be understood that more or fewer network devices or terminal devices may be included in communication system 100 to which the methods of embodiments of the present application may be applied. The network device or terminal device may be hardware, or may be functionally divided software, or a combination of both. The network device and the terminal device may communicate with each other through other devices or network elements. In the communication system 100, the network device 110 may transmit downlink data to the terminal devices 101 to 106. Of course, the terminal devices 101 to 106 may transmit uplink data to the network device 110. Terminal devices 101-106 may be cellular telephones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, palmtop computers (personal digital assistant, PDAs), and/or any other suitable device for communicating over wireless communication system 100, etc. The network device 110 may be a network device of LTE and/or NR, and in particular may be a base station (NodeB), an evolved base station (eNodeB), a base station in a 5G mobile communication system, a next generation mobile communication base station (Next generation Node B, gNB), a base station in a future mobile communication system or an access node in a Wi-Fi system. The communication system 100 may employ a public land mobile network (public land mobile network, PLMN), a device-to-device (D2D) network, a machine-to-machine (machine to machine, M2M) network, an internet of things (internet of things, ioT), or other network. In addition, the terminal devices 104 to 106 may constitute a communication system. In the communication system, the terminal device 105 can transmit downlink data to the terminal device 104 or the terminal device 106. The method in the embodiment of the present application may be applied to the communication system 100 shown in fig. 1.

In a wireless communication system, communication methods can be classified into: the network device sends information to the terminal device called Downlink (DL) communication, and the terminal device sends information to the network device called Uplink (UL) communication. In new radio access technology (new radio access technology, NR) systems of fourth generation (fourth generation, 4G) and fifth generation (5G) wireless communication systems, uplink transmission can acquire diversity and multiplexing gain through uplink precoding. In uplink transmission, demodulation reference signals (demodulation reference signal, DMRS) and sounding reference signals (sounding reference signal, SRS) may be used for network side channel estimation. DMRS is used for demodulation of physical uplink shared channel (physical uplink shared channel, PUSCH) data, SRS signals are used for channel state information (channel state information, CSI) measurement, and the channel state information includes channel quality indication (Channel quality indicator, CQI), precoding indication (precoding matrix indicator, PMI), rank Indicator (RI), SRS resource indication (SRS resource indicator, SRI), and the like. In a 5G system, uplink precoding includes a codebook-based transmission mode and a non-codebook-based transmission mode. In the codebook-based transmission mode, the base station selects an appropriate codebook from a predefined set of uplink codebooks according to the channel state and indicates the index of the selected codebook to the terminal through a control channel. In a non-codebook based transmission mode, the base station selects an appropriate SRI according to a channel state and indicates the SRI to the terminal through a control channel. In the 4G system, however, only the codebook-based transmission mode is supported by the uplink.

With the development of mobile communication and the emergence of emerging services, the demand for uplink capacity is increasing. For example, for some video monitoring scenarios, the terminal is required to transmit high definition video back to the base station. In order to increase uplink capacity, enhancements to uplink transmission techniques, especially uplink MIMO, are required. In uplink MIMO transmission, the existing 5G standard supports up to 12 user orthogonal pairs. Although multi-user pairing is adopted, the number of space streams transmitted in parallel is improved. However, as the number of paired users increases, the data interference between users increases. When the number of paired streams is higher than 12, there is interference between reference signals for channel estimation for multi-stream transmission, and data interference between multiple users increases.

An uplink shared channel (physical uplink shared channel, PUSCH) supports a codebook (codebook) based transmission mode and a Non-codebook based transmission mode. As shown in fig. 2, fig. 2 is a flow chart of a non-codebook-based precoding determination method. Comprising the following steps:

s201, the base station sends CSI-RS to the terminal equipment.

S202, it is assumed that the downlink channel and the uplink channel are reciprocal, i.e., the downlink channel and the uplink channel are the same or similar. The feature vector score can be performed on the downlink channel, and the feature vector obtained by decomposition is used as uplink precoding. For example, for a terminal device of two uplink signals, two eigenvectors corresponding to two largest eigenvalues may be selected as uplink precoding. Two feature vectors are used on two different SRS resources, each of which is distinguished by SRI.

S203, the terminal equipment sends the pre-coded SRS, namely the SRS subjected to pre-coding weighting.

S204, the base station selects the optimal SRI so that the selected precoding meets the maximum requirement of the speed or the capacity.

S205, the SRI is indicated by an SRS resource indication (SRS resource indicator, SRI) field in the downlink control indication (downlink control indicator, DCI). The indicated bit length is related to the number of the configured SRS resources and the maximum layer number of the uplink single user transmission, and the calculation formula is as follows:wherein L is _max Maximum number of transport layers, N, supportable by a terminal device configured for radio resource control (radio resource control, RRC) layer signaling _SRS Number of SRS resources configured for RRC layer signaling.

S206, after the terminal equipment receives the SRI sent by the base station, determining a precoding matrix W corresponding to the SRI. The equipment terminal maps the PUSCH transmission data to each antenna port, and the mapping process is as follows:

wherein W is a determined precoding matrix, y ^(υ-1) (i) For data that is not precoded, v is the layer index,is the data after being pre-coded, namely corresponds to the antenna port p _ρ-1 Data on the same. For two antenna port uniflow (Rank is 1) transmission, i.e. +.>W represents a precoding matrix with dimensions of 2 rows and 1 column. If single antenna transmission is performed, W defaults to 1, which is equivalent to not precoding.

For the above-determined precoding matrix, only a single-user optimal precoding matrix is considered. When the terminal equipment measures the channel according to the CSI-RS, the interference information during uplink multiuser pairing cannot be obtained, and only the channel of the terminal equipment can be obtained. When the terminal equipment sends the coded SRS, the precoding matrix used does not consider uplink multiuser interference, so that the precoding matrix is not optimal for uplink multiuser MIMO transmission, and interference suppression among multiple users is not facilitated. In addition, for uplink single users, interference between uplink cells is not considered, and may not be optimal, when determining precoding of SRS from CSI-RS. In order to solve the technical problems, the embodiment of the application provides the following solutions.

As shown in fig. 3, fig. 3 is a flow chart of a communication method according to an embodiment of the present application. The steps in the embodiment of the application at least comprise:

s301, the network equipment sends precoding indication information to the terminal equipment, wherein the precoding indication information comprises the corresponding relation between the rotation phase value and the SRI.

Alternatively, different rotation phase values may be included in one phase rotation direction, and the terminal device rotates the precoding matrix according to the rotation phase value, which is equivalent to adjusting the beam direction of the precoding matrix. The terminal equipment can perform eigenvector decomposition on the downlink channel to determine a precoding matrix, and then rotate the precoding matrix according to different rotation phase values according to the number of antenna ports of the uplink of the terminal equipment. For example, for a 1-antenna port terminal device, one phase rotation direction may be configured, for example, to rotate in the x-axis direction or to rotate in the y-axis direction, or two phase rotation directions may be configured, for example, to rotate in the x-axis direction and to rotate in the y-axis direction. For a terminal device with 4 antenna ports, two or more phase rotation directions may be configured, and rotation of the precoding matrix may be performed in different directions. Each phase rotation direction may define a phase set.

Optionally, the rotational phase value includes at least one of a rotational phase value in a horizontal dimension, a rotational phase value in a vertical dimension, and a rotational phase value in other dimensions. Alternatively, different rotational phase values may be included in one dimension. Such as 45 degrees, 90 degrees in the horizontal dimension, 45 degrees, 90 degrees in the vertical dimension, etc.

Optionally, the network device sends the precoding indication information to the terminal device through radio resource control (radio resource control, RRC) signaling.

Further, the network device may indicate the rotation phase value through a physical uplink shared channel configuration (PUSCH-Config) information element (information element, IE) in RRC signaling. The rotation phase value may also be indicated by other IEs or newly added IEs, the rotation phase value indicated by RRC signaling being a subset or a full set of the phase set. For example, the network device may indicate that the phase factor N1 in a certain phase rotation direction, N1 is an integer greater than or equal to 1. N1=4, 8, 16, etc. Generating a phase set from a phase factor N1For example n1=4, the phase set isThe corresponding index values are 1, 2, 3 and 4. The network device indicates one or more rotation phase values through a precoding matrix phase rotation table 1 (precoding matrix phase rotationlist 1) field in RRC signaling, e.g., corresponding phase ∈if index values 2 and 3 are indicated >And->Similarly, the network device may also indicate that the phase factor N2, N2 in the other phase rotation direction is an integer greater than or equal to 1, the phase set is +.>One or more rotation phase values are indicated by a precoding matrix phase rotation table 2 (precoding matrix phase rotationlist 2) field in RRC signaling. For example, if index values 1 st and 4 th are indicated, the corresponding phases 0 and +.>In addition, the generation formula of the phase set can also be +.>There is no limitation in this regard.

Alternatively, the network device may configure SRS resources and SRIs through RRC signaling. Further, the configuration may be performed by a sounding reference signal configuration (SRS-config) information element (information element, IE) in RRC signaling.

Alternatively, the correspondence between the rotation phase value and the SRI may be implicitly indicated, for example, by a default sequence. As shown in table 1, for example, the 0 th RSI corresponds to the first phase index 1, and the first phase index 1 indicates one rotation phase value in the first phase rotation direction. For another example, the K1 st RSI corresponds to a second phase index 1, the second phase index 1 indicating one rotation phase value in the second phase rotation direction.

TABLE 1

SRI	Phase rotation indication
		0	First phase index 1
1	First phase index 2
		2	First phase index 3
…	…
		K1-1	First phase index K1
K1	Second phase index 1
		K1+1	Second phase index 2
…	…
		K2+K1-1	Second phase index K2

Alternatively, if the order of the SRIs does not correspond to the index of the rotation phase value, the correspondence between the rotation phase value and the sounding reference signal resource index SRI may be in a display indication manner. For example, a field may be newly added in RRC to indicate the correspondence between the rotation phase value and the sounding reference signal resource index SRI.

S302, the network equipment configures a first SRI for the terminal equipment, and determines that the first SRI corresponds to a first rotation phase value according to the corresponding relation between the rotation phase value and the SRI. The terminal equipment determines a first SRI configured by the network equipment for the terminal equipment; and determining a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI.

Specifically, the network device may configure a plurality of SRIs for the terminal device through RRC signaling, and the terminal device may select the first SRI from the plurality of SRIs. The first SRI may include one or more SRIs, and accordingly, the first rotational phase value may also include one or more rotational phase values, and the number of the first SRIs may be the same as the number of the first rotational phase values. For example, the precoding indication information includes the correspondence between 4 sets of rotation phase values and the sounding reference signal resource index SRI, SRI0 corresponds to rotation phase value 0, SRI1 corresponds to rotation phase value SRI2 corresponds to a rotational phase value +.>SRI3 corresponds to a rotational phase value +.>The first SRI determined by the terminal device may include a part of or all of the SRI of the precoding indication information. For example, the first SRI may include SRI1 and SRI2, representing on the basis of a precoding matrixPhase rotation is performed, the rotation phase values are +.>And

s303, the network equipment sends a channel state information reference signal (CSI-RS) to the terminal equipment. The CSI-RS is used for downlink channel measurement by the terminal equipment.

Note that the execution order of S301 and S303 is not limited to this order, and S303 may be executed first and S301 may be executed later.

S304, the terminal equipment determines a rotated precoding matrix according to the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value.

Specifically, after receiving the CSI-RS, the terminal device may determine downlink channel information, i.e. channel matrices on each transmitting antenna port and each receiving antenna port, according to the CSI-RS. Based on the reciprocity or correlation of the uplink channel and the downlink channel, the terminal device may estimate the uplink channel matrix H. When wideband precoding transmission is adopted (i.e. the same precoding matrix is used on the system bandwidth), H is an uplink channel matrix on the system bandwidth, and is obtained by averaging channels on different subcarriers. And according to the uplink channel matrix H, a feature vector matrix v is obtained through feature vector decomposition. The formula is as follows:

evd(H ^* ·H)＝vΣv ^*

Wherein H is an uplink channel matrix, H ^* Is the conjugate transpose of H, v is the eigenvector matrix (i.e., the uplink precoding matrix), v ^H Is the conjugate transpose of v. Each column in v represents a layer and each row in v represents an antenna port. v ₁ The feature vector in the first column is the feature vector in v, and the feature value corresponding to the feature vector in the first column is the largest.

The terminal device can be based on the first rotation phase value and the eigenvector v ₁ Generating a rotated precoding matrix v _1,k . The first rotational phase value corresponds to the first SRI, and thus the rotated precoding momentArray v _1,k Corresponding to the first SRI. The correspondence between the rotated precoding matrix and the first SRI may include one or more groups, and the number of which may be the same as the number of the first SRI. Precoding matrix v _1,k The calculation formula of (2) is as follows:

wherein, the liquid crystal display device comprises a liquid crystal display device,for a phase rotation matrix in two phase rotation directions, the corresponding rotation phase value θ _k And is square matrix, its line number and v _1,k Is equal in number of rows. For example, when the antenna port is 2, only one rotation pattern θ is indicated _k When (I)>

Optionally, the embodiment of the application further includes the following steps:

s305, the terminal equipment sends the rotated precoding matrix to the network equipment on the resources corresponding to the first SRI.

The terminal device may also be understood as transmitting the sounding reference signal (coded SRS) weighted by the rotated precoding matrix to the network device on the corresponding resource on the first SRI. Optionally, if the network device configures N first SRIs for the terminal device, the terminal device needs to send N coded SRS, where the coded SRS is carried on a resource corresponding to the first SRIs. Wherein N is an integer greater than or equal to 1. The resources corresponding to the first SRI may be time-frequency resources indicated by the first SRI.

S306, the network device determines SRI after receiving one or more rotated precoding matrices.

Alternatively, the network device may complete CSI measurement according to the rotated precoding matrix, and the measurement result may include a channel quality indicator (channel quality indicator, CQI), a Rank Indicator (RI), and the like. The network device may also perform user scheduling according to the measurement result of each user, including multi-user pairing result, SRI of each user, time-frequency resource allocation, scheduling and coding policy (modulation and coding scheme, MCS), transport block size (transport block size, TBS) determination, and so on.

Alternatively, if multi-layer transmission (Rank > 1) is employed, the network device may determine the SRI corresponding to the rotated precoding matrix used for each layer transmission.

Because the network device receives the encoded SRS, the rotated precoding matrix cannot be directly determined, and only the equivalent channel, i.e. Hv, can be estimated _1，k . In the following, rank1 transmission is taken as an example, a phase rotation direction is configured, and it is assumed that N users participate in pairing,the kth equivalent channel (containing precoding matrix) for nth user, w _n For receiving the weight coefficient, the calculation formula of SINR of the nth user is as follows:

wherein, the liquid crystal display device comprises a liquid crystal display device,the kth equivalent channel for the jth user, I _inter-cell Sigma, for inter-cell interference ² Is the noise power, w _n May be determined based on a minimum mean square error (minimum mean square error, MMSE) criterion or a maximum ratio combining criterion.

Finally, the network device may determine an optimal rotated precoding matrix, i.e., SRI, according to the maximization and rate criteria. The formula is as follows:

where Φ is the paired user set and f is the SINR to rate mapping function. For proportional fair scheduling, additional priority weights need to be considered when calculating the rate. In performing multi-user pairing, the user can select different usersTo change the magnitudes of the signal and the interference. The SRI is determined, for example, by traversing the user and rotated precoding matrices to meet the maximum rate requirement.

S307, the terminal equipment receives downlink control information from the network equipment, wherein the downlink control information comprises a second SRI.

S308, the terminal equipment determines a second precoding matrix corresponding to the second SRI according to the corresponding relation between the rotation phase value and the SRI, wherein the second SRI is one value in the first SRI.

Optionally, the terminal device may generate a corresponding relationship between the rotated precoding matrix and the first SRI according to the corresponding relationship between the rotation phase value and the sounding reference signal resource index SRI, and the specific step may refer to S304. And then determining a second precoding matrix according to the corresponding relation between the rotated precoding matrix and the first SRI and the second SRI. The second precoding matrix is one matrix (rank=1) of the one or more rotated precoding matrices determined in S304.

Alternatively, if multi-layer transmission (Rank > 1) is adopted, the terminal device may receive a plurality of SRIs, and the terminal device may determine the second precoding matrix according to the SRIs corresponding to each layer.

S309, the terminal device maps PUSCH data or demodulation reference signals (demodulation reference signal, DMRS) to each antenna port according to the second precoding matrix. And transmitting the mapped PUSCH data or DMRS to the network device.

In the embodiment of the application, precoding indication information is sent to the terminal equipment through the network equipment, and the terminal equipment generates one or more rotated precoding matrixes and sends the precoding matrixes to the network equipment through the coded SRS. When the network equipment performs multi-user pairing, the channel information and inter-cell interference information of the users in the whole cell can be obtained, and the optimal precoding matrix of the paired users is selected, so that the interference during multi-user pairing is effectively restrained or reduced. The terminal equipment performs data mapping according to the optimal precoding matrix and then transmits the data, so that the transmission performance of the MIMO system can be improved, and the uplink capacity can be improved.

As shown in fig. 4, fig. 4 is a flow chart of another communication method according to an embodiment of the present application. The steps in the embodiment of the application at least comprise:

s401, the network device sends precoding indication information to the terminal device, where the precoding indication information includes a set of rotation phase values. The set of rotational phase values may include one or more rotational phase values.

Further, the network device may indicate the rotation phase value through a physical uplink shared channel configuration (PUSCH-Config) information element (information element, IE) in RRC signaling. The rotation phase value may also be indicated by other IEs or newly added IEs, the rotation phase value indicated by RRC signaling being a subset or a full set of the phase set. For example, the network device may indicate that the phase factor N1 in a certain phase rotation direction, N1 is an integer greater than or equal to 1. N1=4, 8, 16, etc. Generating a phase set from a phase factor N1 For example n1=4, the phase set is +.>The corresponding index values are 1, 2, 3 and 4. The network device indicates one through the precoding matrix phase rotation table 1 (precoding matrix phase rotationlist 1) field in the RRC signalingOne or more rotation phase values, e.g. corresponding phase +.>And->Similarly, the network device may also indicate that the phase factor N2, N2 in the other phase rotation direction is an integer greater than or equal to 1, the phase set is +.>One or more rotation phase values are indicated by a precoding matrix phase rotation table 2 (precoding matrix phase rotationlist 2) field in RRC signaling. For example, if index values 1 st and 4 th are indicated, the corresponding phases 0 and +.>In addition, the generation formula of the phase set can also be +.>There is no limitation in this regard.

S402, the network equipment sends a channel state information reference signal (CSI-RS) to the terminal equipment. The CSI-RS is used for downlink channel measurement by the terminal equipment.

Note that the execution order of S401 and S402 is not limited, and S402 may be executed first and then S401 may be executed.

S403, the terminal equipment determines a first precoding matrix. The first precoding matrix may be a eigenvector obtained by decomposing a channel eigenvector, or may be a precoding matrix used for transmitting PUSCH last time.

Optionally, after receiving the CSI-RS, the terminal device may determine downlink channel information, i.e. a channel matrix on each of the transmitting antenna port and the receiving antenna port, according to the CSI-RS. Based on the reciprocity or correlation of the uplink channel and the downlink channel, the terminal device may estimate the uplink channel matrix H. When wideband precoding transmission is adopted (i.e. the same precoding matrix is used on the system bandwidth), H is an uplink channel matrix on the system bandwidth, and is obtained by averaging channels on different subcarriers. And according to the uplink channel matrix, obtaining a feature vector matrix through feature vector decomposition. The formula is as follows:

evd(H ^* ·H)＝vΣv ^*

wherein H is an uplink channel matrix, H ^* Is the conjugate transpose of H, v is the eigenvector matrix (i.e., the uplink precoding matrix), v ^H Is the conjugate transpose of v. Each column in v represents a layer and each row in v represents an antenna port.

S404, the terminal device sends SRS (precoded SRS) weighted by the first precoding matrix and SRS (non-coded SRS) not weighted by the first precoding matrix to the network device.

Alternatively, the terminal device may transmit the encoded SRS and the non-encoded SRS in one slot, or may transmit the encoded SRS and the non-encoded SRS in different slots or in different periods.

In the previous embodiment, for each layer of transmission, a corresponding number of precoding matrices after rotation is required to be transmitted by the network device. In this embodiment, for each layer of transmission, the terminal device may only transmit one SRS weighted by the first precoding matrix and one SRS not weighted by the first precoding matrix, thereby reducing signaling overhead.

And S405, the network equipment determines a rotation phase value of the precoding matrix according to the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix.

Alternatively, the network device may perform channel estimation and CSI measurement, including CQI, RI, etc., based on the coded SRS and the non-coded SRS. Optionally, the network device may estimate a first precoding matrix carried by the encoded SRS, and then perform phase rotation to pair users according to the estimated first precoding matrix. And finally, determining a rotation phase value according to a multi-user pairing criterion, and completing the allocation of time-frequency resources. The specific steps are as follows:

The network device can estimate the equivalent channel containing the first precoding matrix through the coded SRSThe first column of feature vectors for user n in v above. It should be noted that +.>The precoding matrix may be a precoding matrix that has not been rotated (corresponding to a eigenvector obtained by decomposing a channel eigenvector), or may be a precoding matrix after rotation (corresponding to a precoding matrix that has last transmitted PUSCH). The channel +.>For a pair ofFeature vector +.>By comparison->And->Can determine +.>Whether or not the phase rotation is performed. For example, by the following formula>

Wherein, |·| is a modulo operation. The phase determined by the formula (4-1) is θ _k0 ^* And phi _m0 ^* If (3)As a feature vector, θ _k0 ^* And phi _m0 ^* The value of (2) is 0, which corresponds to no phase rotation in both phase rotation directions. Of course, errors may be introduced in channel estimation, affecting θ _k0 ^* And phi _m0 ^* Is a value of (a).

After the network device receives the plurality of encoded SRSs, the network device may determine an SRI transmitted per layer and may also determine a rotational phase value of a precoding matrix per layer. Taking the transmission stream as an example, only one phase rotation direction is configured, assuming that N users participate in pairing, Channel for nth user, +.>Is a precoding matrix, w _n To receive the weight coefficients, the SINR of the nth user is:

wherein I is _inter-cell Sigma, for inter-cell interference ² Is the noise power. H _j Channel for the jth user, V _j And the precoding matrix of the j-th user. By varying the rotational phase value a (θ _k ) To determine an optimal precoding matrix. The calculation formula is as follows:

where Φ is the paired user set and f is the SINR to rate mapping function. For proportional fair scheduling, additional priority weights need to be considered when calculating the rate.

The rotation phase value θ of each paired user can be determined according to the formula (4-2) and the formula (4-3) _k ^* . The phase initial value theta determined by combining the formula (4-1) _k0 ^* Finally, the phase rotation difference delta of the paired users n is determined _n The method comprises the following steps:

Δ _n ＝θ _k ^* -θ _k0 ^* (4-4)

note that if the first precoding matrix transmitted in S404 may be a eigenvector obtained by decomposition of a channel eigenvector, Δ _n ＝θ _k ^* 。

Alternatively, if the network device is configured with multiple phase rotation directions (e.g.,) The rotational phase value is determined for each phase rotation direction using a similar method as described above.

S406, the terminal equipment receives downlink control information from the network equipment, wherein the downlink control information comprises indication information of the rotation phase value.

Optionally, the downlink control information DCI may further include an SRI. The DCI may indicate a selected SRI for each layer transmission. For each SRI, a rotational phase value may be additionally indicated, as shown in tables 2 and 3. If the SRIs are indicated with L1 bits, the rotational phase value corresponding to each SRI is indicated with L2 bits. Table 2 shows the indication of the rotational phase value corresponding to one phase rotation direction.

TABLE 2

If the network device indicates rotational phase values corresponding to a plurality of phase rotational directions, for example, two phase rotational directions (values of θ and φ) are indicated as shown in Table 3.

TABLE 3 Table 3

S407, the terminal equipment determines a rotated precoding matrix according to the rotation phase value corresponding to the indication information of the rotation phase value and the first precoding matrix.

Optionally, the terminal device may determine the first precoding matrix according to the SRI carried in the downlink control information; and then determining the rotated precoding matrix according to the first precoding matrix and the rotation phase value corresponding to the indication information of the rotation phase value. Further, the rotated precoding matrix may be obtained by multiplying the first precoding matrix by the rotation phase value.

Optionally, the terminal device may determine the rotated precoding matrix according to the rotation phase value corresponding to the indication information of the rotation phase value and the first precoding matrix determined in S403. Further, the rotated precoding matrix may be obtained by multiplying the first precoding matrix by the rotation phase value.

And S408, the terminal equipment maps the PUSCH data or the DMRS to each antenna port according to the rotated precoding matrix, and sends the mapped PUSCH data or the mapped DMRS to the network equipment.

In the embodiment of the application, the terminal equipment determines the rotation phase value through the coded SRS and the non-coded SRS by sending the coded SRS and the non-coded SRS to the network equipment, and when the multi-user pairing is carried out, the terminal equipment can acquire the channel information and the inter-cell interference information of the users in the whole cell, thereby effectively inhibiting or reducing the interference when the multi-user pairing is carried out. After receiving the rotation phase value, the terminal equipment can rotate the precoding matrix according to the rotation phase value, and then perform data mapping according to the rotated precoding matrix and then transmit the data, thereby improving the transmission performance of the MIMO system and improving the uplink capacity.

Fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application, as shown in fig. 5. The communication means may be a terminal device, or a chip or processing system in a terminal device, which may be used to implement any of the methods and functions related to a terminal device in any of the foregoing embodiments, and which may include a receiving module 501, a processing module 502 and a sending module 503. Optionally, the receiving module 501 and the sending module 503 correspond to a radio frequency circuit and a baseband circuit included in the terminal device. Wherein the detailed description of each module is as follows.

In one embodiment:

a receiving module 501, configured to receive precoding indication information from a network device, where the precoding indication information includes a correspondence between a rotation phase value and a sounding reference signal resource index SRI;

a processing module 502, configured to determine a first SRI configured by the network device for the terminal device; determining a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI;

a receiving module 501, configured to receive a channel state information reference signal CSI-RS from the network device;

the processing module 502 is further configured to determine a rotated precoding matrix according to the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value.

Optionally, the sending module 503 is configured to send the rotated precoding matrix to the network device on a resource corresponding to the first SRI.

Optionally, the receiving module 501 is further configured to receive downlink control information from the network device, where the downlink control information includes a second SRI; the processing module 502 is further configured to determine a second precoding matrix corresponding to the second SRI according to the correspondence between the rotation phase value and the sounding reference signal resource index SRI, where the second SRI is one value of the first SRI.

Optionally, the rotational phase value includes at least one of a rotational phase value in a horizontal dimension, a rotational phase value in a vertical dimension, and a rotational phase value in other dimensions.

In another embodiment:

a sending module 503, configured to send, to a network device, an SRS weighted by a first precoding matrix and an SRS not weighted by the first precoding matrix;

a receiving module 501, configured to receive downlink control information from the network device, where the downlink control information includes indication information of a rotation phase value;

and the processing module 502 is configured to determine a rotated precoding matrix according to the rotation phase value corresponding to the indication information of the rotation phase value and the first precoding matrix.

Optionally, the receiving module 501 is further configured to receive precoding indication information from the network device, where the precoding indication information includes a set of rotation phase values, and the indication information of the rotation phase values is used to determine the rotation phase value from the set of rotation phase values.

Optionally, the receiving module 501 is further configured to receive a channel state information reference signal CSI-RS from the network device; the processing module 502 is further configured to determine a channel eigenvector according to the CSI-RS, where the channel eigenvector is used to determine the first precoding matrix.

Optionally, the downlink control information further includes a sounding reference signal resource index SRI; the processing module 502 is further configured to determine the first precoding matrix according to the SRI.

It should be noted that, the implementation of each module may also correspond to the corresponding description of the method embodiment shown in fig. 3 and fig. 4, and perform the method and the function performed by the terminal device in the foregoing embodiment.

Fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application, as shown in fig. 6. The communication apparatus may be a network device, or a chip or a processing system in a network device, which may be used to implement any of the methods and functions related to a network device in any of the foregoing embodiments, and may include a sending module 601, a receiving module 602, and a processing module 603. Optionally, the sending module 601 and the receiving module 603 correspond to a radio frequency circuit and a baseband circuit included in the network device. Wherein the detailed description of each module is as follows.

In one embodiment:

a sending module 601, configured to send precoding indication information to a terminal device, where the precoding indication information includes a correspondence between a rotation phase value and a sounding reference signal resource index SRI;

a processing module 603, configured to configure a first SRI for the terminal device, and determine that the first SRI corresponds to a first rotation phase value according to a correspondence between the rotation phase value and the SRI;

the sending module 601 is further configured to send a channel state information reference signal CSI-RS to the terminal device, where the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value are used to determine a rotated precoding matrix.

Optionally, the receiving module 602 is configured to receive the rotated precoding matrix sent by the terminal device on a resource corresponding to the first SRI.

Optionally, the sending module 601 is further configured to send downlink control information to the terminal device, where the downlink control information includes a second SRI, where the second SRI is used for determining, by the terminal device, a second precoding matrix according to a correspondence between the rotation phase value and a sounding reference signal resource index SRI, and the second SRI is one value in the first SRI.

In another embodiment:

a receiving module 602, configured to receive, from a terminal device, an SRS weighted by a first precoding matrix and an SRS not weighted by the first precoding matrix;

a processing module 603, configured to determine a rotation phase value of a precoding matrix according to the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix;

a sending module 601, configured to send downlink control information to the terminal device, where the downlink control information includes indication information of the rotation phase value, and the rotation phase value corresponding to the indication information of the rotation phase value is used to determine a rotated precoding matrix.

Optionally, the sending module 601 is further configured to send precoding indication information to the terminal device, where the precoding indication information includes a set of rotational phase values, and the indication information of the rotational phase values is used by the terminal device to determine the rotational phase value from the set of rotational phase values.

Optionally, the sending module 601 is further configured to send a channel state information reference signal CSI-RS to the terminal device, where the CSI-RS is used for determining a channel eigenvector by the terminal device, and the channel eigenvector is used for determining the first precoding matrix.

Optionally, the downlink control information further includes a sounding reference signal resource index SRI, where the SRI is used by the terminal device to determine the first precoding matrix.

It should be noted that, the implementation of each module may also correspond to the corresponding description of the method embodiment shown in fig. 3 and fig. 4, and perform the method and the function performed by the network device in the foregoing embodiment.

As shown in fig. 7, fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 7, the terminal device may include: at least one processor 701, at least one communication interface 702, at least one memory 703 and at least one communication bus 704.

The processor 701 may be a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that performs the function of a computation, e.g., a combination comprising one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so forth. Communication bus 704 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, or the like. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 7, but not only one bus or one type of bus. Communication bus 704 is used to enable connected communications between these components. The communication interface 702 of the device in the embodiment of the present application is used for performing signaling or data communication with other node devices. The memory 703 may include volatile memory such as nonvolatile dynamic random access memory (nonvolatile random access memory, NVRAM), phase change RAM (PRAM), magnetoresistive RAM (MRAM), etc., and may also include nonvolatile memory such as at least one magnetic disk storage device, electrically erasable programmable read only memory (electrically erasable programmable read-only memory, EEPROM), flash memory device such as flash memory (NOR flash memory) or flash memory (NAND flash memory), semiconductor device such as Solid State Disk (SSD), etc. The memory 703 may optionally also be at least one storage device located remotely from the aforementioned processor 701. Optionally, a set of program code may also be stored in the memory 703. The processor 701 may also optionally execute programs stored in the memory 703.

In one embodiment:

receiving precoding indication information from network equipment, wherein the precoding indication information comprises a corresponding relation between a rotation phase value and a sounding reference signal resource index SRI;

determining a first SRI configured by the network equipment for the terminal equipment;

the terminal equipment determines a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI;

receiving a channel state information reference signal (CSI-RS) from the network equipment;

and determining a rotated precoding matrix according to the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value.

Optionally, the processor 701 is further configured to perform the following operation steps:

and transmitting the rotated precoding matrix to the network equipment on the resources corresponding to the first SRI.

the terminal equipment receives downlink control information from the network equipment, wherein the downlink control information comprises a second SRI;

and the terminal equipment determines a second precoding matrix corresponding to the second SRI according to the corresponding relation between the rotation phase value and the SRI, wherein the second SRI is one value in the first SRI.

In another embodiment:

sending the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix to network equipment;

receiving downlink control information from the network equipment, wherein the downlink control information comprises indication information of a rotation phase value;

and determining a rotated precoding matrix according to the rotation phase value corresponding to the indication information of the rotation phase value and the first precoding matrix.

and receiving precoding indication information from the network equipment, wherein the precoding indication information comprises a rotation phase value set, and the indication information of the rotation phase value is used for determining the rotation phase value from the rotation phase value set.

and determining a channel characteristic vector according to the CSI-RS, wherein the channel characteristic vector is used for determining the first precoding matrix.

Optionally, the downlink control information further includes a sounding reference signal resource index SRI; the processor 701 is further configured to perform the following operation steps:

and determining the first precoding matrix according to the SRI.

Further, the processor may also cooperate with the memory and the communication interface to perform the operations of the terminal device in the embodiments of the application.

As shown in fig. 8, fig. 8 is a schematic structural diagram of a network device according to an embodiment of the present application. As shown, the network device may include: at least one processor 801, at least one communication interface 802, at least one memory 803, and at least one communication bus 804.

Among them, the processor 801 may be various types of processors mentioned above. The communication bus 804 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus or the like. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 8, but not only one bus or one type of bus. The communication bus 804 is used to enable connected communications between these components. The communication interface 802 of the device in the embodiment of the present application is used for performing signaling or data communication with other node devices. The memory 803 may be various types of memories mentioned previously. The memory 803 may optionally be at least one memory device located remotely from the processor 801. A set of program codes is stored in the memory 803, and the processor 801 executes the programs in the memory 803.

In one embodiment:

transmitting precoding indication information to terminal equipment, wherein the precoding indication information comprises a corresponding relation between a rotation phase value and a sounding reference signal resource index SRI;

a first SRI is configured for the terminal equipment, and a first rotation phase value corresponding to the first SRI is determined according to the corresponding relation between the rotation phase value and the SRI;

and sending a channel state information reference signal (CSI-RS) to the terminal equipment, wherein an uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value are used for determining a rotated precoding matrix.

Optionally, the processor 801 is further configured to perform the following operation steps:

and receiving the rotated precoding matrix sent by the terminal equipment on the resource corresponding to the first SRI.

and sending downlink control information to the terminal equipment, wherein the downlink control information comprises a second SRI, the second SRI is used for determining a second precoding matrix by the terminal equipment according to the corresponding relation between the rotation phase value and the SRI, and the second SRI is one value in the first SRI.

In another embodiment:

receiving SRS weighted by a first precoding matrix and SRS not weighted by the first precoding matrix from terminal equipment;

determining a rotation phase value of a precoding matrix according to the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix;

and sending downlink control information to the terminal equipment, wherein the downlink control information comprises indication information of the rotation phase value, and the rotation phase value corresponding to the indication information of the rotation phase value is used for determining a rotated precoding matrix.

and sending precoding indication information to the terminal equipment, wherein the precoding indication information comprises a rotation phase value set, and the indication information of the rotation phase value is used for the terminal equipment to determine the rotation phase value from the rotation phase value set.

the network device sends a channel state information reference signal (CSI-RS) to the terminal device, wherein the CSI-RS is used for determining a channel characteristic vector by the terminal device, and the channel characteristic vector is used for determining the first precoding matrix.

Further, the processor may also cooperate with the memory and the communication interface to perform the operations of the network device in the embodiments of the application.

The embodiment of the application also provides a chip system, which comprises a processor, and is used for supporting terminal equipment or network equipment to realize the functions related in any embodiment, such as generating or processing the precoding matrix related in the method. In one possible design, the chip system may further include a memory for program instructions and data necessary for the terminal device or the network device. The chip system can be composed of chips, and can also comprise chips and other discrete devices.

The embodiment of the application also provides a processor, which is used for being coupled with the memory and used for executing any method and function related to the terminal equipment or the network equipment in any of the above embodiments.

Embodiments of the present application also provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform any of the methods and functions of any of the embodiments described above involving a terminal device or a network device.

The embodiment of the application also provides a device for executing any method and function related to the terminal equipment or the network equipment in any of the above embodiments.

The embodiment of the application also provides a wireless communication system, which comprises at least one terminal device and at least one network device, wherein the terminal device and the network device are related to any one of the embodiments.

In the above embodiments, it may be implemented in whole or in part 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, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.

The above-mentioned specific embodiments further describe the objects, technical solutions and advantageous effects of the present application in detail. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method of communication, comprising:

the method comprises the steps that terminal equipment receives precoding indication information from network equipment, wherein the precoding indication information comprises a corresponding relation between a rotation phase value and a sounding reference signal resource index SRI;

the terminal equipment determines a first SRI configured by the network equipment for the terminal equipment;

the terminal equipment receives a channel state information reference signal (CSI-RS) from the network equipment;

the terminal equipment determines a rotated precoding matrix according to the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value;

And the terminal equipment determines a second precoding matrix corresponding to the second SRI according to the corresponding relation between the rotation phase value and the SRI, wherein the second SRI is one or more values in the first SRI.

2. The method of claim 1, wherein the method further comprises:

and the terminal equipment sends the rotated precoding matrix to the network equipment on the resources corresponding to the first SRI.

3. The method of claim 1 or 2, wherein the rotational phase values comprise at least one of rotational phase values in a horizontal dimension, rotational phase values in a vertical dimension, and rotational phase values in other dimensions.

4. A method of communication, comprising:

the network device sends precoding indication information to the terminal device, the precoding indication information comprises a corresponding relation between a rotation phase value and a sounding reference signal resource index SRI,

the network equipment configures a first SRI for the terminal equipment, and determines a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI;

the network equipment sends a channel state information reference signal (CSI-RS) to the terminal equipment, wherein an uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value are used for determining a rotated precoding matrix;

The network device sends downlink control information to the terminal device, wherein the downlink control information comprises a second SRI, the second SRI is used for determining a second precoding matrix according to the corresponding relation between the rotation phase value and the SRI, and the second SRI is one or more values in the first SRI.

5. The method of claim 4, wherein the method further comprises:

and the network equipment receives the rotated precoding matrix sent by the terminal equipment on the resource corresponding to the first SRI.

6. The method of claim 4 or 5, wherein the rotational phase values comprise at least one of rotational phase values in a horizontal dimension, rotational phase values in a vertical dimension, and rotational phase values in other dimensions.

7. A method of communication, comprising:

the terminal equipment sends the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix to the network equipment;

the terminal equipment receives downlink control information from the network equipment, wherein the downlink control information comprises indication information of a rotation phase value;

And the terminal equipment determines a rotated precoding matrix according to the rotation phase value corresponding to the indication information of the rotation phase value and the first precoding matrix.

8. The method of claim 7, wherein the method further comprises:

the terminal device receives precoding indication information from the network device, wherein the precoding indication information comprises a rotation phase value set, and the indication information of the rotation phase value is used for determining the rotation phase value from the rotation phase value set.

9. The method of claim 7 or 8, wherein the method further comprises:

and the terminal equipment determines a channel characteristic vector according to the CSI-RS, wherein the channel characteristic vector is used for determining the first precoding matrix.

10. The method according to claim 7 or 8, wherein the downlink control information further comprises a sounding reference signal resource index, SRI; the method further comprises the steps of:

and the terminal equipment determines the first precoding matrix according to the SRI.

11. A method of communication, comprising:

The network equipment receives SRS weighted by a first precoding matrix and SRS not weighted by the first precoding matrix from the terminal equipment;

the network equipment determines a rotation phase value of a precoding matrix according to the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix;

the network device sends downlink control information to the terminal device, wherein the downlink control information comprises indication information of the rotation phase value, and the rotation phase value corresponding to the indication information of the rotation phase value is used for determining a rotated precoding matrix.

12. The method of claim 11, wherein the method further comprises:

the network device sends precoding indication information to the terminal device, wherein the precoding indication information comprises a rotation phase value set, and the indication information of the rotation phase value is used for the terminal device to determine the rotation phase value from the rotation phase value set.

13. The method of claim 11 or 12, wherein the method further comprises:

14. The method according to claim 11 or 12, wherein the downlink control information further comprises a sounding reference signal resource index, SRI, used by the terminal device to determine the first precoding matrix.

15. A communication device, comprising:

a receiving module, configured to receive precoding indication information from a network device, where the precoding indication information includes a correspondence between a rotation phase value and a sounding reference signal resource index SRI;

a processing module, configured to determine a first SRI configured by the network device for a terminal device; determining a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI;

the receiving module is further configured to receive a channel state information reference signal CSI-RS from the network device;

the processing module is further configured to determine a rotated precoding matrix according to the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value;

the receiving module is further configured to receive downlink control information from the network device, where the downlink control information includes a second SRI;

the processing module is further configured to determine a second precoding matrix corresponding to the second SRI according to a correspondence between the rotation phase value and a sounding reference signal resource index SRI, where the second SRI is one or more values in the first SRI.

16. The apparatus of claim 15, wherein the apparatus further comprises:

and the sending module is used for sending the rotated precoding matrix to the network equipment on the resources corresponding to the first SRI.

17. The apparatus of claim 15 or 16, wherein the rotational phase values comprise at least one of rotational phase values in a horizontal dimension, rotational phase values in a vertical dimension, and rotational phase values in other dimensions.

18. A communication device, comprising:

a sending module, configured to send precoding indication information to a terminal device, where the precoding indication information includes a correspondence between a rotation phase value and a sounding reference signal resource index SRI;

the processing module is used for configuring a first SRI for the terminal equipment, and determining a first rotation phase value corresponding to the first SRI according to the corresponding relation between the rotation phase value and the SRI;

the sending module is further configured to send a channel state information reference signal CSI-RS to the terminal device, where the uplink precoding matrix corresponding to the CSI-RS and the first rotation phase value are used to determine a rotated precoding matrix;

the sending module is further configured to send downlink control information to the terminal device, where the downlink control information includes a second SRI, where the second SRI is used for determining, by the terminal device, a second precoding matrix according to a correspondence between the rotation phase value and a sounding reference signal resource index SRI, and the second SRI is one or more values in the first SRI.

19. The apparatus of claim 18, wherein the apparatus further comprises:

and the receiving module is used for receiving the rotated precoding matrix sent by the terminal equipment on the resource corresponding to the first SRI.

20. The apparatus of claim 18 or 19, wherein the rotational phase values comprise at least one of rotational phase values in a horizontal dimension, rotational phase values in a vertical dimension, and rotational phase values in other dimensions.

21. A communication device, comprising:

a sending module, configured to send, to a network device, an SRS weighted by a first precoding matrix and an SRS not weighted by the first precoding matrix;

a receiving module, configured to receive downlink control information from the network device, where the downlink control information includes indication information of a rotation phase value;

and the processing module is used for determining a rotated precoding matrix according to the rotation phase value corresponding to the indication information of the rotation phase value and the first precoding matrix.

22. The apparatus of claim 21, wherein the device comprises a plurality of sensors,

the receiving module is further configured to receive precoding indication information from the network device, where the precoding indication information includes a set of rotation phase values, and the indication information of the rotation phase values is used to determine the rotation phase value from the set of rotation phase values.

23. The apparatus of claim 21 or 22,

the processing module is further configured to determine a channel eigenvector according to the CSI-RS, where the channel eigenvector is used to determine the first precoding matrix.

24. The apparatus of claim 21 or 22, wherein the downlink control information further comprises a sounding reference signal resource index, SRI;

the processing module is further configured to determine the first precoding matrix according to the SRI.

25. A communication device, comprising:

a receiving module, configured to receive an SRS weighted by a first precoding matrix and an SRS not weighted by the first precoding matrix from a terminal device;

the processing module is used for determining a rotation phase value of the precoding matrix according to the SRS weighted by the first precoding matrix and the SRS not weighted by the first precoding matrix;

the sending module is used for sending downlink control information to the terminal equipment, the downlink control information comprises indication information of the rotation phase value, and the rotation phase value corresponding to the indication information of the rotation phase value is used for determining the rotated precoding matrix.

26. The apparatus of claim 25, wherein the device comprises a plurality of sensors,

the sending module is further configured to send precoding indication information to the terminal device, where the precoding indication information includes a set of rotation phase values, and the indication information of the rotation phase values is used for the terminal device to determine the rotation phase values from the set of rotation phase values.

27. The apparatus of claim 25 or 26, wherein the device comprises a plurality of sensors,

the sending module is further configured to send a channel state information reference signal CSI-RS to the terminal device, where the CSI-RS is used for determining a channel eigenvector by the terminal device, and the channel eigenvector is used for determining the first precoding matrix.

28. The apparatus of claim 25 or 26, wherein the downlink control information further comprises a sounding reference signal resource index, SRI, the SRI being used by the terminal device to determine the first precoding matrix.

29. A computer readable storage medium storing instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 14.

30. A chip comprising a processor and a memory for storing instructions that are executed by the processor to cause the chip to perform the method of any one of claims 1 to 14.