WO2018127151A1

WO2018127151A1 - Precoding matrix instruction method, apparatus and system

Info

Publication number: WO2018127151A1
Application number: PCT/CN2018/071641
Authority: WO
Inventors: 黄逸; 任海豹; 李元杰
Original assignee: 华为技术有限公司
Priority date: 2017-01-06
Filing date: 2018-01-05
Publication date: 2018-07-12
Also published as: CN108282207B; CN108282207A

Abstract

A precoding matrix instruction method. A first wireless communication apparatus obtains a first instruction and a second instruction from a second wireless communication apparatus, the first instruction being used for instructing the first wireless communication apparatus to wirelessly transmit, to the second wireless communication apparatus, a first precoding matrix that needs to be used, and the second instruction being used for instructing the first wireless communication apparatus to wirelessly transmit, to the second wireless communication apparatus, a second precoding matrix that needs to be used; the first precoding matrix comprising information about a beam used when the first wireless communication apparatus performs wireless transmission to the second wireless communication apparatus, and the first precoding matrix belonging to a first codebook; and the second precoding matrix comprising information about a phase difference used when the first wireless communication apparatus performs wireless transmission to the second wireless communication apparatus, and the second precoding matrix belonging to a second codebook. The method disclosed in the present application effectively improves uplink MIMO transmission performance in a scenario in which multiple antennas are configured on a UE side.

Description

Precoding matrix indication method, device and system

The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. No. In this application.

Technical field

The present application relates to the field of wireless communication technologies, and in particular, to a precoding matrix indication method, apparatus, and system in a wireless communication system.

Background technique

In wireless networks, Massive Multiple Input Multiple Output (Massive MIMO) technology can utilize more spatial freedom to further increase system capacity. It is a new generation of wireless access technology (New Radio Access Technology, One of the key technologies in NR). A radio base station device in an NR system may be referred to as a Transmit Receive Point (TRP) or a gNB. In addition to the TRP, the NR usually configures a large-scale antenna. The user equipment (User Equipment, UE) also configures multiple antennas. The antennas configured on the user equipment in the NR may be distributed on multiple antenna panels, which makes the UE more suitable for multi-stream. The transmitted scene improves the performance of the uplink transmission. As shown in FIG. 1 , the user equipment is configured with two antenna panels, namely an antenna panel 1 and an antenna panel 2 . As shown in the figure, the antenna panel 2 is configured with multiple antenna arrays, wherein each “X” can be understood as It is an antenna vibrator, "X" also indicates different polarization directions, "X" usually corresponds to two antenna ports, and a single-polarized antenna is usually not represented by X. Similarly, the antenna panel 1 can be similarly configured with multiple antenna arrays, which will not be described herein for brevity.

In order to cooperate with the application of Massive MIMO technology, after configuring a large-scale antenna on the UE side, it is usually necessary to pre-process the data to be transmitted by using a precoding matrix to obtain beamforming gain and reduce interference between different data streams of the same user, thereby Improve system performance.

The Precoding Matrix Indicator (PMI) information required for the precoding by the UE may be obtained by using Downlink Control Information (DCI) sent by the TRP, or by the reciprocity of the uplink and downlink channels. Specifically, the manner in which the UE obtains the precoding matrix indication required for precoding can be classified into three types:

The TRP performs uplink channel estimation according to the uplink sounding reference signal (SRS), and determines the PMI corresponding to the UE precoding matrix in the preset codebook according to the estimated situation, and uses the signaling message to The PMI is sent to the UE.

2. The UE presets some precoding matrix transmission reference signals (such as SRS), and the base station selects one of the precoding matrices according to the received signal strength and indicates to the UE.

3. The UE performs channel estimation according to a Channel State Information Reference Signal (CSI-RS), and calculates an uplink precoding matrix according to the reciprocity of the uplink and downlink channels.

In the scheme of determining, according to the precoding code used by the uplink transmission, which precoding matrix is used by the UE to perform uplink transmission, the TRP can perform centralized processing on channel information of multiple UEs, thereby achieving the most when selecting the precoding matrix. Excellent choice. Therefore, the scheme can reduce interference between uplink UEs and has better robustness. The TRP can also indicate information such as the transmission rank (the number of transmitted data layers) and the channel quality indicator (CQI) of the UE, as a reference for the uplink data transmission of the UE.

Generally, for each rank, a certain number of precoding matrices are involved to represent the quantized channels, and the precoding matrices involved constitute a codebook, and each precoding matrix in the codebook corresponds to one or more Precoding matrix index, usually the precoding matrix index has a corresponding relationship with the corresponding PMI. The codebook is usually pre-defined, and the corresponding codebook is stored on the TRP end and the UE end, and the correspondence between each precoding matrix, precoding matrix index and PMI in the codebook stored at both ends is agreed. Understanding is consistent. After the TRP selects a precoding matrix from the defined codebook and determines its precoding matrix index according to the estimated uplink channel, only the PMI corresponding to the selected precoding matrix needs to pass downlink signaling (for example, The physical layer signaling (DCI) can notify the UE that the UE can determine a specific precoding matrix according to the signaling sent by the TRP.

The Long Term Evolution (LTE) system introduces an uplink codebook in Release 10 (Release 10). In the LTE, the network side indicates the domain by using Precoding Information and Number of Layers in DCI format 4. The UE is informed of the precoding matrix information used for uplink data transmission. For the case where the 2 antenna ports are configured on the UE side, the relationship between the indication domain information and the number of layers and PMI is as shown in Table 1:

Table I:

The value of the transmit uplink precoding matrix indication information (transmit PMI, TPMI) corresponds to the codebook index in Table 2 below:

Table II:

It can be seen that the codebook with rank 1 is composed of a combination of Discrete Fourier Transform (DFT) vector and antenna selection vector, and the codebook with rank 2 is an identity matrix.

For the case where the 4 antenna ports are configured on the UE side, the relationship between the indication domain information and the number of layers and PMI is as shown in Table 3:

Table 3:

As shown in Table 3, when the number of transport layers is 1 (ie, 1 layer), the value of TPMI corresponds to the codebook index in Table 4 below:

Table 4

As shown in Table 3, when the number of transport layers is 2 (ie 2layer), the value of TPMI corresponds to the codebook index in Table 5 below:

Table 5

As shown in Table 3, when the number of transmission layers is 3 (ie, 3layer), the value of TPMI corresponds to the codebook index in Table 6 below:

Table 6

As shown in Table 3, when the number of transport layers is 4 (ie 4layer), the value of TPMI corresponds to the codebook index in Table 7 below:

Table 7:

In summary, in the scheme of Table 3, the codebook with Rank 1 is composed of 16 Glassman constant modulus vector and 8 antenna selection vector, and Rank is 2 codebooks by 8cross product vector (for CLA array) and 8 antenna selection vectors (for non-CLA arrays) are combined, and a codebook with a Rank of 3 consists of 12 antenna selection vectors (the first stream selects two of the four antennas, and the other two streams correspond to one antenna, respectively. This method will cause the power imbalance between streams, which affects performance to some extent. The codebook with a Rank of 4 is an identity matrix.

Since the single carrier frequency division multiple access (SC-FDMA) technology is adopted in the LTE system, the constant model requirement for precoding is strict. The NR uplink can support Orthogonal Frequency Division Multiplexing (OFDM), which makes the NR system's constant model requirement for the precoding matrix can be reduced, so that the existing codebook design is not flexible enough, that is, The original codebook design did not consider antenna correlation, performance was poor, and it could not support dual-polarized antennas.

On the other hand, the NR uplink support multi-carrier system may support more than 100M bandwidth, and there is a frequency selective fading problem. In the existing LTE system, the transmission PMI indication in the DCI is full bandwidth indication information, and thus cannot satisfy the NR data transmission. Demand.

On the other hand, for the case where the uplink MIMO using the cyclic prefix-based OFDM (Cyclic Prefix OFDM, CP OFD) waveform supports the frequency selective precoding technique, if the existing LTE codebook structure is used, it is indicated for each subband. The overhead of transferring PMI is too large.

On the other hand, there are generally scatterers around the UE, and beam occlusion may occur in the case of high frequency communication. Some precoded pre-synchronized SRS ports may be blocked. For example, in an uplink co-frequency multi-connection scenario, some panels of the UE may be blocked.

In the NR system, the uplink can support non-precoded sounding reference signals (non-precoded SRS) and precoded sounding reference signals (precoded SRS), while the existing uplink codebook cannot support precoded SRS. In the prior art, the class B (CLASS B) codebook mainly supports a dual-polarized base station-end regular antenna array, but the antenna structure configuration of the UE is flexible.

Summary of the invention

The present application describes a precoding matrix indication method, apparatus and system. In a wireless transmission scenario, a first level codebook is used to indicate a beam by using a two-stage codebook structure in combination with a hierarchical precoding matrix indication. The second-level codebook is used to indicate the phase difference information, so as to improve uplink MIMO transmission performance in a scenario where multiple antennas are configured on the UE side. For example, reducing the overhead of the PMI indication in the prior art also ensures the availability of the codebook even after some SRS ports are occluded, for example, in a high-rank scenario.

A first aspect of the embodiments of the present invention provides a precoding matrix indication method, including:

The first wireless communication device acquires a first indication and a second indication from the second wireless communication device, the first indication being used to instruct the first wireless communication device to perform wireless transmission to the second wireless communication device a first precoding matrix, the second indication being used to instruct the first wireless communications device to perform a second precoding matrix used for wireless transmission to the second wireless communications device; the first precoding matrix comprises The first wireless communication device performs wireless transmission of information of a used beam to the second wireless communication device, the first precoding matrix being attributed to the first wireless communication device performing to the second wireless a first codebook used by the communication device for wireless transmission; the second precoding matrix includes information of a phase difference used by the first wireless communication device, the second precoding matrix being attributed to the first The wireless communication device performs a second codebook used for wireless transmission to the second wireless communication device. By using a two-stage codebook structure, the first-level codebook is used to indicate beam information, and the second-stage codebook is used to indicate phase difference information, so as to improve uplink MIMO transmission in a scenario where multiple antennas are configured on the UE side. performance.

In a possible design, the precoding vector included in each precoding matrix in the first codebook is a discrete Fourier transform vector, or a precoding vector included in each precoding matrix in the first codebook. Corresponding to at least one wide beam or at least one narrow beam.

In a possible design, a part of the elements of the at least one precoding vector in the first codebook is 0; another part of the precoding vectors is a discrete Fourier transform vector, or the other part of the element It is a precoding vector based on Glassman packing theory.

In one possible design, the discrete Fourier transform vector is designed to:

or,

Where N is the number of antenna ports of the sounding reference signal, O is an integer greater than or equal to 1, indicating an oversampling factor, m is the number of the vector, corresponding codebook index, π is the pi, e is the natural constant, and j is the imaginary unit. , [·] ^T represents the conjugate transpose operation.

In a possible design, the first indication and the second indication are included in physical layer signaling from the second wireless communication device, where the physical layer signaling includes a first indication field and a a second indication field, the first indication field comprising the first indication, and the second indication field comprising the second indication.

In a possible design, the first indication and the second indication are included in physical layer signaling from the second wireless communication device, the physical layer signaling includes an indication domain, An indication field includes the first indication and the second indication.

In a possible design, the first indication and the second indication are included in high layer signaling from the second wireless communications apparatus, where the high layer signaling includes a first indication field and a second indication a domain, the first indication field includes the first indication, and the second indication field includes the second indication.

In a possible design, the first indication and the second indication are included in high layer signaling from the second wireless communication device, the high layer signaling includes an indication field, the one indication The domain includes the first indication and the second indication.

In a possible design, the first wireless communication device acquires the first indication and the second indication from the second wireless communication device, including: the first indication is included in the second wireless communication device In the first signaling, the first wireless communication device receives second signaling from the second wireless communication device, and the second signaling includes when the second indication is used in a data channel And the information of the frequency resource, the first wireless communication device demodulating and obtaining the second indication according to the information of the time-frequency resource included in the second signaling.

In a feasible design, the embodiment of the present application proposes a two-level codebook structure for uplink transmission, and the two-level codebook structure can be used in combination with a hierarchical PMI indication mechanism, and the two-level codebook is used. The total codebook structure can be expressed as: W=W ₁ ·W ₂ , where

Where u _i and u′ _i may be the same or different structured precoding vectors,

Indicates a co-phasing factor, which may be polarization phase information or phase difference information of a dual-polarized antenna. The two-level codebook involved in the embodiment of the present invention is two mutually independent codebooks, and the first PMI corresponding to the beam selection and the second PMI corresponding to the cophsing selection, but the LTE is compared with the config 1 codebook in the LTE Release 13. The two PMIs in Release 13 jointly determine a matrix, which is not flexible enough; and config 1/2/3/4 requires high-level parameter configuration, signaling overhead is relatively large, and there is no performance gain.

In a possible design, when the number of transmission layers is 1, the first codebook is designed as:

In one possible design, the second codebook is designed to:

Codebook index

The number of transmission layers is 1

00	[1 1] ^T [1 1] ^T
11	[1 -1] ^T [1 -1] ^T
22	[1 +j] ^T [1 +j] ^T
33	[1 -j] ^T [1 -j] ^T

Where T represents a matrix transpose, and 1, -1, +j, -j are quadrature amplitude modulation character sets.

In a possible design, when the number of transmission layers is 1, the first codebook and the second codebook are designed as:

among them,

P represents a factor that normalizes the precoding vector power in the codebook.

In one possible design, the phase difference information includes information of a phase difference of a cross-polarized antenna, or information of a phase difference between a plurality of beams.

In a possible design, the first codebook and the second codebook are pre-configured in the first wireless communication device and/or the second wireless communication device.

In a possible design, the wide beam is an analog beam, or a beam corresponding to an antenna virtualization weight, or a beam formed when the number of antenna ports/the number of antenna elements is small; the narrow beam is a number Simulate the beam formed by the mixture of weights, or the beam formed by digital weights.

A second aspect of the embodiments of the present invention provides a first wireless communications apparatus, including: at least one processor, a memory, a transceiver, and a bus system, the processor, the memory, and the transceiver coupled by a bus system, the A wireless communication device is in communication with the second wireless communication device through the transceiver, the memory for storing program instructions, the at least one processor for executing the program instructions stored in the memory, such that the A wireless communication device performs the portion of the first wireless communication device that is executed in a possible design of any of the precoding matrix indicating methods in accordance with the first aspect of the present invention. The first wireless communication device can be a terminal device.

A third aspect of the embodiments of the present invention provides a second wireless communications apparatus, including: at least one processor, a memory, a transceiver, and a bus system, the processor, the memory, the transceiver coupled by a bus system, the a wireless communication device communicating with the first wireless communication device via the transceiver, the memory for storing program instructions, the at least one processor for executing the program instructions stored in the memory, such that the The second wireless communication device performs the portion of the second wireless communication device that is executed in a possible design of the precoding matrix indicating method according to any of the first aspects of the present invention. The second wireless communication device can be a wireless access network device.

A fourth aspect of the embodiments of the present invention provides a system chip, which is applied to a first wireless communication device, where the system chip includes:

At least one processor, a memory, a communication interface, and a bus system, said processor, said memory, said transceiver being coupled by a bus system, said communication interface being for said system chip and said first wireless communication device Communication, the memory for storing program instructions, the at least one processor for executing the program instructions stored in the memory, such that the first wireless communication device completes any of the first aspects of the embodiments of the present invention The precoding matrix indicates the portion of the method that the first wireless communication device performs in the possible design of the method.

A fifth aspect of the embodiments of the present invention provides a system chip, which is applied to a second wireless communication device, where the system chip includes:

At least one processor, a memory, a communication interface, and a bus system, said processor, said memory, said transceiver being coupled by a bus system, said communication interface being for said system chip and said second wireless communication device Communication, the memory for storing program instructions, the at least one processor for executing the program instructions stored in the memory, such that the second wireless communication device completes any of the first aspects of the embodiments of the present invention The precoding matrix indicates the portion of the method that the second wireless communication device performs in the possible design of the method.

A fifth aspect of the embodiments of the present invention provides a communication system, where the communication system includes a first wireless communication device according to a second aspect of the present invention, and a second wireless communication device provided by the third aspect of the embodiment of the present invention. The first wireless communication device and the second wireless communication device cooperate to perform a possible design of the precoding matrix indication method of any of the first aspects of the embodiments of the present invention.

The precoding matrix indication method, apparatus, system, and the like provided by the embodiments of the present invention use a two-level codebook structure, combined with a hierarchical precoding matrix indication (for example, using a two-level PMI), and the first level codebook is used. For indicating the beam information, the second-stage codebook is used to indicate the phase difference information, thereby effectively improving the uplink MIMO transmission performance in the scenario where multiple antennas are configured on the UE side, for example, reducing the system overhead of the PMI indication in the prior art. This makes it possible to guarantee the availability of codebooks even after some SRS ports are occluded, such as in high-rank scenarios.

DRAWINGS

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

1 is a schematic block diagram of a structure for configuring a multi-panel array antenna in a UE according to the present application;

FIG. 2 is a schematic diagram of a possible application scenario according to an embodiment of the present application;

FIG. 3 is a schematic flowchart of a method for indicating a precoding matrix according to an embodiment of the present disclosure;

4 is a schematic block diagram of a wireless communication apparatus according to an embodiment of the present application;

FIG. 5 is a schematic block diagram of a wireless communication apparatus according to an embodiment of the present application; FIG.

FIG. 6 is a schematic block diagram of a wireless communication apparatus according to an embodiment of the present application; FIG.

FIG. 7 is a schematic block diagram of a wireless communication apparatus according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the accompanying drawings in the embodiments.

The network architecture and the service scenario described in the embodiments of the present application are for the purpose of more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute a limitation of the technical solutions provided by the embodiments of the present application. The technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

The techniques described in this application may be applicable to Long Term Evolution (LTE) systems and subsequent evolved systems such as the 5th Generation mobile communication (5G), etc., or other wireless communications that require precoding techniques. The system is especially suitable for communication systems involving the application of precoding matrices. As shown in FIG. 2, it is a schematic diagram of a possible application scenario of the present application. The user equipment (201) accesses the network device through the wireless interface for communication, and can also communicate with another user equipment, such as a device to device (D2D) or a machine to machine (M2M) scenario. Communication. The network device (202) can communicate with the user equipment or with another network device, such as a communication between the macro base station and the access point. In the present application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand the meaning.

The user equipment referred to in the present application may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, control devices, or other processing devices connected to the wireless modem, and various forms of UE, mobile The user equipment described in the present application may be movable or fixed at a certain location, such as a mobile station (MS), a terminal (Terminal), or a terminal equipment (Terminal Equipment). For convenience of description, they are collectively referred to as user equipment.

The network device (202) involved in the present application may be a radio access network device (such as a base station), a network controller, or a mobile switching center, and is not limited herein. The device that directly communicates with the user equipment (201) through the wireless channel is usually a base station (202), and the base station (202) can be a macro base station, a micro base station, a relay station, an access point, or a radio remote. A remote radio unit (RRU), etc., of course, may be other network devices (202) having similar wireless communication functions for wireless communication with the user equipment (201), which is not limited in this application. In different systems, the name of the device (202) with base station function may be different, for example, in an LTE network, called an evolved NodeB (eNB or eNodeB), in the third generation (the 3rd Generation) In the 3G network, it is called a Node B. In a subsequent evolution system such as 5G, it can be called a Transmission Reception Point (TRP).

The technical solution provided by the present application can be applied between a radio access network device and a user equipment, for example, between a base station and a user equipment, and can also be applied to other communication devices that need to precode the transmission data, such as two. The communication device with the wireless transmission function is described by taking the network device and the user device as an example in the embodiment of the present application.

The following is a description of some common concepts or definitions involved in the embodiments of the present application. It should be noted that some of the descriptions in the present application are referred to as the LTE system as an example for describing the embodiments of the present application, which may be followed. The evolution of the network changes. For specific evolution, refer to the description in the corresponding standard.

The antenna port (Antenna Port) described in this application is generally used to transmit physical channels or signals. The channel that the symbol transmitted on one antenna port experiences can pass through the channel experienced by other symbols transmitted on the same antenna port. Inferred to get.

Beam, as used in this application, is an understanding of a radio wave formed in a certain direction and shape in space when a wireless signal is transmitted or received by at least one antenna port. The beam may be formed by weighting the amplitude and/or phase of the data transmitted or received by the at least one antenna port, or may be formed by other methods, such as adjusting the relevant parameters of the antenna unit, and forming a beam. Just for example. The understanding of the beam may also be defined as a resource, which may include an antenna port, a time-frequency resource, or a beam number, and the like. The understanding of the beam can also be understood from the physical meaning of the beam. For example, a beam is composed of one or more (logical) antennas, and the weight of each (logical) antenna is formed by the precoding matrix of the baseband or the phase shift of the radio frequency end. , called a beam.

The antenna panel (or simply “panel”) described in the present application refers to a device for carrying a physical antenna, and an antenna panel may carry an antenna array composed of multiple antenna units, or may be composed of multiple antenna panels. Multi-panel Antenna Array.

The matrix or precoding matrix described in the present application may also include a vector with a row number or a column number of 1.

The term “and/or” in the present application is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B. In addition, the character "/" in the present application generally indicates that the context of the context is an "or" relationship.

A selective statement of the technical solution of the embodiments of the present invention:

An embodiment of the present invention provides a precoding matrix indication method, in a wireless communication system, a first wireless communication device receives a first indication and a second indication sent by a second wireless communication device, where the first indication is used to indicate the first a wireless communication device performing a first precoding matrix for wireless transmission to the second wireless communication device, the second indication for instructing the first wireless communication device to perform wireless transmission to the second wireless communication device a second precoding matrix; the first precoding matrix includes information that the first wireless communication device performs a beam used for wireless transmission to the second wireless communication device, the first precoding matrix being attributed to the first wireless communication The device performs a first codebook used for wireless transmission to the second wireless communication device; the second precoding matrix includes information of a phase difference used by the first wireless communication device, the second precoding matrix is attributed to The first wireless communication device performs a second codebook used for wireless transmission to the second wireless communication device. The phase difference information may be information of a phase difference of the cross-polarized antenna, or the phase difference information may be information of a phase difference between the plurality of beams.

Specifically, in a wireless communication implementation scenario, if the first wireless communication device is a terminal device, usually a mobile terminal device, and the second wireless communication device is a wireless access network device, then the first wireless communication device performs the second wireless communication The direction of wireless transmission of the device is the uplink transmission direction.

In a feasible design, the precoding vector included in each precoding matrix in the first codebook is a discrete Fourier transform vector, or the precoding vector included in each precoding matrix in the first codebook corresponds to at least A wide beam or at least one narrow beam. The wide beam may be an analog beam, or a beam corresponding to an antenna virtualization weight, or a beam formed when the number of antenna ports/the number of antenna elements is small; the narrow beam may be a beam formed by a mixture of digital analog weights. Or a beam formed by digital weights.

In a feasible design, a part of the elements of the at least one precoding vector in the first codebook is 0; another part of the precoding vector is a discrete Fourier transform vector, or the other part of the element is based on Grasse Precoding vector designed by Man Box Theory. The discrete Fourier transform vector design can be:

or,

In a feasible design, the first indication and the second indication are included in physical layer signaling from the second wireless communication device, where the physical layer signaling includes a first indication domain and a second indication domain, The first indication field includes the first indication, and the second indication field includes the second indication; or the first indication and the second indication are included in physical layer signaling from the second wireless communications device, The physical layer signaling includes an indication field, the one indication field includes the first indication and the second indication; or the first indication and the second indication are included in high layer signaling from the second wireless communication device The high-level signaling includes a first indication field and a second indication field, where the first indication field includes the first indication, the second indication field includes the second indication, or the first indication and the second indication The high layer signaling included in the higher layer signaling from the second wireless communication device includes an indication field, the one indication field including the first indication and the second indication.

In a possible design, the first wireless communication device acquires the first indication and the second indication from the second wireless communication device, including: the first indication is included in the first from the second wireless communication device In the signaling, the first wireless communication device receives the second signaling from the second wireless communication device, where the second signaling includes the second information indicating the time-frequency resource used in the data channel, the A wireless communication device demodulates and obtains the second indication according to the information of the time-frequency resource included in the second signaling.

Indicates a co-phasing factor, which may be polarization phase information or phase difference information of a dual-polarized antenna.

In a feasible design, when the number of transmission layers is 1, the first codebook is designed as:

In a feasible design, when the number of transmission layers is 1, the second codebook is designed as:

码本索引Codebook index	传输层数为1The number of transmission layers is 1
00	[1 1] ^T [1 1] ^T
11	[1 -1] ^T [1 -1] ^T
22	[1 +j] ^T [1 +j] ^T
33	[1 -j] ^T [1 -j] ^T

In a feasible design, when the number of transmission layers is 1, the first codebook and the second codebook are designed as:

among them,

In a feasible design, the first codebook and the second codebook may be pre-configured in the first wireless communication device and/or the second wireless communication device.

The selective statements of the embodiments of the present invention are not intended to limit the various possible designs that are made within the scope of the embodiments of the present invention. For ease of understanding, the design of the embodiments of the present invention is explained from a feasible perspective.

The details provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

FIG. 3 is a schematic flowchart diagram of a precoding matrix indication method 300 according to an embodiment of the present disclosure.

Note: The block diagram is used in Figure 3 and labeled "300", mainly for the convenience of reading and reference, and does not involve an understanding of the substantive technical solutions.

This embodiment can be applied to a scenario in which a terminal device performs precoding transmission on the uplink, for example, in a scenario: when the number of transmission ports is greater than X (X can be a positive integer greater than 2), for using cyclic prefix-based OFDM (Cyclic Prefix) The OFDM, CP OFD) waveform MIMO supports a frequency selective precoding is supported for UL MIMO with CP-OFDM waveform when the transmission ports is greater than X.

As shown in FIG. 3, in section 301 (this part is not required), the terminal device sends an uplink reference signal to the radio access network device.

In this embodiment, the terminal device sends an uplink reference signal to the radio access network device, so that the radio access network device is configured to perform channel measurement.

For example, the uplink reference signal is an SRS, the radio access network device is a TRP, and the terminal device is a UE. The UE transmits an uplink reference signal for channel measurement, and the TRP receives the uplink reference signal sent by the UE. Channel estimation, optionally, the TRP uses a preset codebook and a channel matrix to perform matching, and selects a corresponding precoding matrix according to the matching result, thereby determining a PMI corresponding to the precoding matrix. The TRP indicates the precoding matrix to be used for the uplink transmission of the UE by using one or more downlink signaling after the UE selects the precoding matrix, and the UE performs uplink data transmission according to the precoding matrix indicated in the downlink signaling. In this way, in the case that the UE can support a large number of antennas, even if some UE antennas are blocked or damaged, the UE can also apply uplink precoding transmission in the foregoing scenario, thereby further improving transmission performance.

The TRP selects a precoding matrix to be used for the UE uplink transmission in the preset codebook. In this embodiment, a two-level codebook structure is proposed.

Optionally, one implementation manner of the structure of the two-level codebook is that the first-level codebook includes beam selection vector information. For example, the pre-coding vector in the codebook may be a uniform beam uniformly distributed in a set of spaces. The wide beam can be generally an analog beam or a beam corresponding to the antenna virtualization weight. Generally, when the antenna oscillator is relatively small, in this option, the DFT vector can be used:

or,

Form the first level codebook. Where N is the number of antenna ports of the SRS, O is an integer greater than or equal to 1, indicating an oversampling factor, m is the number of the vector, corresponding to the codebook index, π is the pi, e is the natural constant, and j is the imaginary unit, [ ·] ^T indicates a conjugate transposition operation, which can be configured by the TRP to the UE through downlink signaling.

Optionally, if the UE uses a two-dimensional antenna array, that is, if the UE is configured with at least one antenna panel, another implementation manner of the first-level codebook is that the DFT vector can be utilized.

or,

Forming a first-level codebook, where N1 represents the number of antenna ports in the vertical dimension, N2 represents the number of antenna ports in the horizontal dimension, and O1 and O2 are integers greater than or equal to 1, respectively representing the oversampling factors of the vertical dimension and the horizontal dimension, m, l represents the number of the vector, corresponding to the first horizontal/vertical codebook index, π represents the pi, e represents the natural constant, and j represents the imaginary unit. The UE can be informed by the TRP through downlink signaling (such as high layer signaling or physical layer signaling).

Taking the number of transmission layers equal to 1, the expression of the first level codebook may be as shown in the following Table 8:

Table 8:

Where u may be the aforementioned u _m , representing the first codebook of the dual-polarized antenna, and the matrices on the two diagonals respectively represent the precoding matrix in the two polarization directions.

The above codebook may be the first codebook of the dual-polarized antenna, and the matrices on the two diagonals respectively represent precoding matrices in two polarization directions.

Optionally, the second level codebook may include phase compensation factor information for the polarized antenna, and the element constituting the precoding matrix in the second level codebook may be e ^jπn/2 (where π represents a pi and e represents a natural constant , j denotes an imaginary unit, and n denotes a second codebook index), for example, a Quadrature Amplitude Modulation (QAM) character set {1, -1, +j, -j}. The second level codebook can be expressed as shown in Table 9 below:

Table 9:

第二码本索引Second codebook index	传输层数＝1Number of transmission layers = 1
00	[1 1] ^T [1 1] ^T
11	[1 -1] ^T [1 -1] ^T
22	[1 +j] ^T [1 +j] ^T
33	[1 -j] ^T [1 -j] ^T
…...	…...

Where [·] ^T represents a conjugate transposition operation, j represents an imaginary unit, the above codebook may be a second codebook of a dual-polarized antenna, and two diagonal matrixes respectively represent phases in two polarization directions factor.

Optionally, taking the number of transmission layers=1 as an example, the first level codebook and the second level codebook may also be designed as the following table ten:

Table 10:

among them,

P represents a factor that normalizes the precoding vector power in the codebook. U may be u _m representing the first codebook of the dual-polarized antenna, and the matrices on the two diagonals respectively represent precoding matrices in the two polarization directions. The entire formula represents a precoding vector in a codebook that is jointly determined by the first codebook index and the second codebook index.

Optionally, if a two-dimensional antenna array is configured on the UE side, the format of the codebook is similar to the above table, except that the first codebook index becomes two values of m and l, and details are not described herein again.

Section 302: The radio access network device sends an indication to the terminal device to indicate that the user equipment uses the selected precoding matrix to transmit uplink data.

In this section, a radio access network device (such as a TRP) sends a first PMI and/or a second PMI to a terminal device, such as a UE. Optionally, the first PMI may correspond to any one of the foregoing first codebook indexes, where the first PMI may be a broadband PMI, and the radio access network device further sends a second PMI to the terminal device, where the second PMI is The PMI corresponds to the second codebook index, and the second PMI may be a subband PMI, which can better adapt to the uplink OFDM system for the subband level PMI.

Optionally, considering different terminal configurations, for example, some terminal devices are not configured with multiple antenna panels, or no polarized antennas are configured, or the terminal devices are configured with single-polarized antennas or single-antenna panels, then The access network device may not indicate the second PMI to the terminal, and the terminal device may perform uplink transmission by using the received first PMI, using the uplink precoding matrix corresponding to the first PMI. In this case, optionally, the terminal device The uplink transmission can use only the first level codebook. With this design, system compatibility can be made better.

Optionally, the radio access network device may send the first PMI and/or the second PMI to the terminal device in different periods.

Optionally, the radio access network device indicates, by the downlink signaling, the first PMI and the second PMI of the terminal device, where the downlink signaling may be physical layer signaling or higher layer signaling, when the signaling is physical layer signaling. The signaling may be DCI. When the signaling is high layer signaling, the signaling may be Radio Resource Control (RRC) or a Media Access Control Control Element (MAC CE).

Another feasible signaling manner, the radio access network device may send the first PMI to the terminal device by sending downlink signaling (such as a physical layer or a high layer signaling), and the radio access network device And signaling to the terminal device, the time-frequency resource used by the second PMI in the data channel, to notify the terminal device of the downlink signaling of the time-frequency resource where the second PMI is located, where the wireless access network device carries the first PMI The signaling may also be separately sent by the radio access network device, as long as the information about the time-frequency resource used by the second PMI in the data channel can be carried in the downlink signaling. The UE obtains the second PMI by demodulating on the indicated time-frequency resource. The terminal device determines an uplink precoding matrix according to the first PMI and the second PMI, and performs uplink data transmission. The technical effect of this is that, because the second PMI may occupy more resources, it may not be accommodated in signaling (such as DCI), and the scheme can save control signaling resources.

For the scenario in which the terminal device has multiple antenna ports, a plurality of feasible signaling structures for the downlink indication PMI are also provided. The number of the antenna ports on the terminal device side may be two, four or eight. Wait.

When the signaling sent by the radio access network device is physical layer signaling, an indication field in the physical layer control signaling may include a transmission layer number and PMI information, and the indication domain name may be, for example, precoding information and layer number. (Precoding Information and Number of Layers), a feasible implementation is as follows:

The PMI 1 shown in the table represents the first PMI, and the PMI 2 represents the second PMI. Here, the technical meanings of the first PMI and the second PMI may refer to the foregoing embodiments of the present invention regarding the two-level codebook and the two-level PMI. A description of a viable design.

Optionally, the signaling sent by the radio access network device is a physical layer control signaling, where two separate indication fields may be used to carry the transmission layer number and the PMI information, where The information used to indicate PMI information can carry two PMIs. The examples are as follows:

Optionally, for the case that the downlink signaling is physical layer control signaling, three separate indication fields may also be utilized, respectively indicating the number of transmission layers, the first PMI information and the second PMI information, for example, using the indication field “number of Layers" indicates the number of transport layers, the indication field "Precoding information 1" is used to indicate the first PMI information, and the indication field "Precoding information 2" is used to indicate the second PMI information. Here, the technical meanings of the first PMI and the second PMI can be referred to the description of various feasible designs of the two-stage codebook and the two-stage PMI in the foregoing embodiments of the present invention.

Optionally, for the case of using the high layer signaling and the physical layer control signaling to jointly indicate the transmission layer number information, the high layer signaling is an RRC signaling or a MAC CE, and an indication field in the high layer signaling is used. : "number of layers") to indicate the transport layer information, using an indication field in the physical layer control signaling to indicate PMI information, a feasible implementation is as follows:

Optionally, for the case of using the high layer signaling and the physical layer control signaling to jointly indicate the transmission layer number information, an indication field in the high layer signaling (for example, “number of layers”) may be used to indicate the transport layer. Information; two indication fields in the physical layer control signaling are used to indicate PMI information, for example, the indication field "Precoding information 1" is used to indicate the first PMI information, and the indication field "Precoding information 2" is used to indicate the second PMI information.

Optionally, an indication field in the high-level signaling sent by the radio access network device may be used to indicate one or two or more PMI information, or may be used in the high-level signaling delivered by the radio access network device. The multiple indication fields respectively indicate multiple PMI information. For example, two indication fields in the high layer signaling respectively indicate two PMI information, and three indication fields in the high layer signaling respectively indicate three PMI information.

Section 303: The terminal device performs uplink data transmission according to the precoding matrix indicated by the radio access network device.

The various feasible designs associated with FIG. 3 above may be applied to a non-precoded SRS scenario or a precoded SRS scenario in a 5G NR. For a non-precoded SRS scenario, the antenna port configured by the terminal device may be extended to eight. In the precoded SRS scenario, the antenna ports configured in the terminal device can be expanded to four.

Optionally, the non-precoded SRS scenario is used as an example. However, the embodiment of the present application provides a two-level codebook structure for uplink transmission. One purpose is to reduce system signaling overhead. This two-level codebook structure is used in conjunction with a hierarchical PMI indication mechanism. The total codebook structure of the two-level codebook can be expressed as: W=W ₁ ·W ₂ , where

Where u _i and u′ _i may be the same or different structured precoding vectors (could be the same or different structured precoding vectors)

Compared with the technical solution of the uplink two-level codebook proposed in the embodiment of the present application, the codebook used in the existing uplink transmission is only a first-level codebook, and the existing downlink codebook, for example, in LTE Release 8 The first-level codebook is adopted, and the codebook used in LTE Release 10 or LTE Release 12 is used to select one beam group, and the second codebook is used to select one beam from the selected beam group, and determine The polarization phase information (cophasing) is different from the uplink two-level codebook scheme proposed by the embodiment of the present invention in that: the two-level codebook designed by the embodiment of the present invention, wherein the first-level codebook is used to select one The beam, the second-stage codebook is used to determine phase difference information (cophasing), and the phase difference information may be information of a phase difference of the cross-polarized antenna or information of a phase difference between the plurality of beams. Further, the two-level codebook involved in the embodiment of the present invention is two mutually independent codebooks, and the first PMI corresponding to the beam selection and the second PMI corresponding to the cophsing selection are compared with the config 1 codebook in the LTE Release 13. However, the two PMIs in LTE Release 13 jointly determine a matrix, which is not flexible enough; and config 1/2/3/4 requires high-level parameter configuration, signaling overhead is relatively large, and there is no performance gain.

Optionally, based on the foregoing FIG. 3 and various feasible implementation manners thereof, the embodiment of the present application further provides a method for indicating a precoding matrix. For the sake of brevity, this part may be used as a corresponding solution of FIG. 3 . Option, or a replaceable item.

The terminal device transmits an uplink reference signal, and the uplink reference signal may be a precoded SRS. The radio access network device performs channel estimation according to the uplink reference signal transmitted by the terminal device, and performs matching by using a preset codebook and a channel matrix, and selects a corresponding precoding matrix according to the matching result, thereby determining corresponding to the precoding matrix. PMI. For the case of a two-stage codebook structure, the first-level codebook includes beam selection vector information, and the precoding vector in the codebook corresponds to a set of pre-selected beams, which may be an analog beam of the UE or a base station signaling. Inform the UE. For example, using a unit selection vector

Forming a first level codebook, wherein

Is a vector of length N, where the kth element is 1 and the other elements are 0.

Taking the layer number=1 as an example, the first level codebook can be in the following form:

The second level codebook includes phase compensation factor information for the polarized antenna. For example, the elements constituting the precoding matrix in the second level codebook may be QAM character sets {+1, -1, +j, -j}, etc. . A possible form of second-level codebook might be:

第二码本索引Second codebook index	层数＝1Number of layers=1
00	[1 1] ^T [1 1] ^T
11	[1 -1] ^T [1 -1] ^T
22	[1 +j] ^T [1 +j] ^T
33	[1 -j] ^T [1 -j] ^T

Optionally, the number of layers is 1, and the two-level codebook structure can also be expressed as follows:

The first PMI corresponds to the first codebook index and may be a broadband PMI. The second PMI corresponds to the second level codebook index and may be a subband PMI.

In the embodiment of the present invention, the first PMI indicated by the radio access network device to the terminal device may be used to directly select one beam, and the second PMI indicated by the radio access network device to the terminal device may be used to determine the beam according to the foregoing first PMI. The phase compensation factor of the cross-polarized antenna.

In this embodiment, the design idea of the uplink beam management and the precoding matrix indication is combined, and the codebook design is relatively simple. The second PMI can be configured to be a sub-band level and can be adapted to the uplink OFDM system. This embodiment can be applied to a precoded SRS scenario. Compared with the prior art, the uplink codebook does not support the two-level codebook structure, and the performance is poor under the frequency selective channel condition, which has significant advantages, for example, in the frequency selective channel scenario, the second PMI. It is a narrowband PMI, and the first PMI is a wideband PMI, which can further improve system performance compared to the prior art only one-stage wideband PMI.

Optionally, based on the foregoing FIG. 3 and various possible implementation manners thereof, the embodiment of the present application further provides a method for indicating a precoding matrix, which may be an option of the corresponding solution in FIG. 3, or Replaceable item.

The terminal device transmits an uplink reference signal (for example, SRS), and the radio access network device (for example, TRP) performs channel estimation according to the uplink reference signal transmitted by the terminal device, and performs matching by using a preset codebook and a channel matrix, according to the matching result. The corresponding precoding matrix is selected to determine the PMI corresponding to the precoding matrix. For a two-stage codebook structure, beam selection vector information may be included in the first level codebook, and the precoding vector in the codebook is composed of at least two of the following examples:

Example 1: A set of wide beams uniformly distributed in space. For example, you can take advantage of DFT vectors:

or,

Form the first level codebook. Where N is the number of antenna ports of the SRS, and O is an integer greater than or equal to 1, indicating an oversampling factor. The parameters N and O involved herein may be sent by the TRP to send downlink signaling (such as higher layer signaling, or It is physical layer signaling) configured for the UE.

Example 2: A part of the elements in the precoding vector is 0, and the other part forms a wide beam uniformly distributed in space by using the DFT form. For example, you can take advantage of DFT vectors:

or,

Form the first level codebook. Where N is the number of antenna ports of the SRS, and O is an integer greater than or equal to 1, indicating an oversampling factor, wherein the parameters involved in the formula can be configured by the TRP by sending downlink signaling (such as higher layer signaling, physical layer signaling). Give the UE.

Example 3: A part of the element in the precoding vector is 0, for example:

u _m =[a ₁ ...a _k ,0...0,a _k+1 ...a _X ] ^T

Among them, [a ₁ ... a _k ] is a precoding vector designed according to Glassman packing theory.

Optionally, the precoding vector is designed by using the Glassman packing theory, and the precoding vector can be obtained based on a Householder matrix or a DFT matrix.

For example, when the antenna port X=4, the first 16 precoding vectors in the uplink transmission 4-port codebook can be designed as follows:

Optionally, the first level codebook may include the precoding vector in the foregoing example one and the second example. Optionally, the first level codebook may also include the precoding vector in the example one and the third example. Optionally, The first level codebook may also include the precoding vectors in Example 1, Example 2, and Example 3. If the UE uses a two-dimensional antenna array, the first-level codebook can be formed in a similar manner, and details are not described herein again.

Taking the rank equal to 1 as an example, a feasible codebook design method is:

An example of the first level codebook:

The second level codebook contains phase compensation factor information for the polarized antenna, and the elements constituting the precoding matrix in the second level codebook may be e ^jπn/2 , for example, QAM character set +1, -1, +j, -j Wait. A possible design for the second level codebook is as follows:

Optionally, taking the number of layers=1 as an example, the two-level codebook structure can also be designed as follows:

among them,

P is a factor that normalizes the precoding vector power in the codebook.

Optionally, if the terminal side is configured with a 2D antenna array, the format of the codebook may be similar to the foregoing design, except that the first codebook index becomes two values of m and l, and details are not described herein again.

In this embodiment, the first PMI indicated by the radio access network device to the terminal device may correspond to the first codebook index, where the first PMI may be a broadband PMI, and the radio access network device indicates the second PMI to the terminal device. Corresponding to the second level codebook, the second PMI may be a subband PMI. The first PMI and the second PMI may have different indication periods. The network side radio access network device may indicate the first PMI and the second PMI to the terminal device by using downlink signaling, where the downlink signaling may be physical layer signaling or higher layer signaling (such as RRC or MAC layer) signaling.

Optionally, the access network device (for example, TRP) may indicate the first PMI to the terminal device by using downlink signaling, and the access network device further notifies the terminal device of the time-frequency resource used by the second PMI in the data channel, where the UE passes the The second PMI is demodulated on the corresponding time-frequency resource, so that the terminal device determines the uplink pre-coding matrix according to the first PMI and the second PMI, and performs uplink data transmission.

This embodiment combines the design ideas of uplink beam management and precoding matrix indication, and the codebook design is simple. In this embodiment, the second PMI indicated by the radio access network device to the terminal device can be configured as a sub-band level, so that the uplink OFDM system can be better adapted. This embodiment can be applied to a non-precoded SRS scene or a precoded SRS scene. In the case that the number of antennas that can be supported by the UE is increased, and the part of the UE antenna may be blocked or damaged, the embodiment of the present invention may be applied to the uplink precoding transmission in the scenario to further improve the transmission performance.

Compared with the prior art, the uplink codebook does not support the two-level codebook structure, resulting in poor performance under the frequency selective channel condition, and in the prior art, the downlink codebook technology design is not simple enough, and the wireless access network device Selecting a beam group according to the first PMI indicated by the terminal device uplink, the radio access network device selects one beam from the beam group according to the second PMI indicated by the terminal device uplink, and determines a phase compensation factor of the cross-polarized antenna. In the embodiment of the present invention, the terminal device directly selects one beam according to the first PMI sent by the radio access network device, and the terminal device determines according to the second PMI delivered by the radio access network device and the beam selected according to the first PMI. The phase compensation factor of the cross-polarized antenna.

It should be noted that, in the embodiment of the present application, the number of the codebook, such as the "first codebook", the "first PMI", etc., does not constitute a limitation on the embodiment of the present application, and the codebook of the same number is implemented in different embodiments. The mode may correspond to different roles; the same numbered codebook and subcodebook, such as the first codebook and the first PMI, do not have to have a affiliation or a hierarchical relationship in logic and use, for example, the first subcodebook also It can be defined as a fourth codebook and used independently, which is not limited in this application.

It should be understood that, in various embodiments of the present invention, the size of the sequence numbers of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not be taken to the embodiments of the present invention. The implementation process constitutes any limitation.

In the above, the method for precoding matrix indication according to an embodiment of the present invention is described in detail in conjunction with the selective statement of the embodiments of the present invention and the various possible implementations of FIG. Hereinafter, a wireless communication apparatus for employing a precoding matrix indication mechanism according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 through 7.

The embodiment of the invention provides a wireless communication device 400. A schematic block diagram of the network device can be as shown in FIG. 4. 4 is a schematic block diagram of a wireless communication device 400 in accordance with an embodiment of the present invention. As shown in FIG. 4, the wireless communication device 400 includes a receiving unit 410 and a processing unit 420.

Specifically, the wireless communication device 400 can correspond to various feasible designs of the wireless communication device according to the selective statement according to the embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. 3, the wireless communication device The device 400 may include various feasible designs (such as a first wireless communication device, terminal) for performing the selective statement according to an embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. A unit of a method performed by a device, or UE, etc.). Moreover, the various units in the network device 400 and the other operations and/or functions described above are respectively applicable to implement the selective statement according to an embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. 3 The corresponding process of the design, for the sake of brevity, will not be repeated here.

The embodiment of the invention provides a wireless communication device 500. A schematic block diagram of the wireless communication device 500 can be as shown in FIG. 5. FIG. 5 is a schematic block diagram of a wireless communication device 500 in accordance with an embodiment of the present invention. As shown in FIG. 5, the wireless communication device 500 includes a transmitting unit 510 and a processing unit 520.

Specifically, the wireless communication device 500 can correspond to various feasible designs of the wireless communication device according to the selective statement according to the embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. 3, the wireless communication device The device 400 may include various feasible designs (such as a second wireless communication device, wireless) for performing the selective statement according to an embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. A unit of a method of accessing a network device, or a TRP, etc.). And, the various units in the terminal device 500 and the other operations and/or functions described above are respectively applicable to implement the selective statement according to the embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. 3 The corresponding process of the design, for the sake of brevity, will not be repeated here.

The embodiment of the present invention further provides a wireless communication device 600, and a schematic block diagram of the network device can be as shown in FIG. 6. FIG. 6 is a schematic block diagram of a wireless communication device 600 in accordance with another embodiment of the present invention. As shown in FIG. 6, the wireless communication device 600 includes a transceiver 610, a processor 620, a memory 630, and a bus system 640. The transceiver 640, the processor 620, and the memory 630 are connected by a bus system 640. The memory 630 is configured to store program instructions, and the processor 620 is configured to execute the instructions stored in the memory 630 to control the transceiver 610 to send and receive signals. And causing the wireless communication device 600 to perform a corresponding function. The memory 630 may be configured in the processor 620 or may be independent of the processor 620.

In particular, the wireless communication device 600 can correspond to a wireless communication device of various feasible designs involved in the selective statement according to the embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. 3, the wireless communication device The device 600 can include various feasible designs (such as a first wireless communication device, terminal) for performing the selective statement according to an embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. The physical unit of the method performed by the device, or the UE, etc., the respective physical units in the wireless communication device 600 and the other operations and/or functions described above, respectively, in order to implement the selective statement according to an embodiment of the present invention and the implementation corresponding to FIG. For the sake of brevity, the description of the method for indicating the method of the pre-coding matrix 300 of the various possible designs (such as the first wireless communication device, the terminal device, or the UE, etc.) is not repeated here.

The embodiment of the present invention further provides a wireless communication device 700. A schematic block diagram of the wireless communication device 700 can be as shown in FIG. 7. FIG. 7 is a schematic block diagram of a wireless communication device 700 in accordance with another embodiment of the present invention. As shown in FIG. 7, the wireless communication device 700 includes a transceiver 710, a processor 720, a memory 730, and a bus system 740. The transceiver 740, the processor 720 and the memory 730 are connected by a bus system 740 for storing instructions for executing instructions stored in the memory 730 to control the transceiver 710 to send and receive signals, and The wireless communication device 700 is caused to perform the corresponding function. The memory 730 may be configured in the processor 720 or may be independent of the processor 720.

In particular, the wireless communication device 700 can correspond to a wireless communication device of various feasible designs involved in the selective statement according to the embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. The device 700 can include various feasible designs (such as a second wireless communication device, wireless) for performing the selective statement according to an embodiment of the present invention and the indication method 300 of the embodiment precoding matrix corresponding to FIG. A physical unit of a method performed by an access network device, or TRP, etc.). Moreover, each of the physical units in the wireless communication device 700 and the other operations and/or functions described above are respectively implemented in order to implement the selective statement according to an embodiment of the present invention and the method 300 for indicating the precoding matrix of the embodiment corresponding to FIG. The corresponding process of a feasible design, for the sake of brevity, will not be repeated here.

It should be understood that the processor in the embodiment of the present invention may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The processor may be a central processing unit ("CPU"), and may be other general-purpose processors, digital signal processors ("DSP"), and application-specific integrated circuits ( Application Specific Integrated Circuit ("ASIC"), Field Programmable Gate Array ("FPGA") or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The methods, steps, and logical block diagrams disclosed in the embodiments of the present invention may be implemented or carried out. The general purpose processor may be a microprocessor or the processor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software in the decoding processor. The software can be located in a random storage medium, such as a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

It should also be understood that the memory in embodiments of the invention may be a volatile memory or a non-volatile memory, or may include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (Read-Only Memory (ROM), a programmable read only memory (PROM), or an erasable programmable read only memory (Erasable PROM). , referred to as "EPROM"), electrically erasable programmable read only memory ("EEPROM") or flash memory. The volatile memory may be a Random Access Memory ("RAM"), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory. Take memory (Synchronous DRAM, referred to as "SDRAM", Double Data Rate Synchronous Dynamic Random Access Memory (Double Data Rate SDRAM), "Enhanced SDRAM" ("ESDRAM") ), synchronously connected dynamic random access memory (Synchlink DRAM, "SLDRAM" for short) and direct memory bus random access memory (Direct RAMbus), "DR RAM" for short. It should be noted that the memory of the system and method described in this application It is intended to include, without being limited to, these and any other suitable types of memory.

It should also be understood that the bus system may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like. However, for the sake of clarity, the various buses are labeled as bus systems in the figure.

In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software. The steps of the method for data transmission disclosed in connection with the embodiments of the present invention may be directly implemented as hardware processor execution completion, or performed by hardware and software combination in the processor. The software can be located in a random storage medium, such as a flash memory, a read only memory, a programmable read only memory or an electrically erasable programmable memory, a register, and the like. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

Embodiments of the present invention also provide a computer readable storage medium storing one or more programs, the one or more programs including instructions that are executed by an electronic device that includes a plurality of applications The electronic device can be enabled to perform the selective statement of the embodiment of the present invention and the method of the embodiment shown in FIG.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

The functions may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a standalone product. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including The instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A precoding matrix indication method, characterized in that it comprises:

The first wireless communication device acquires a first indication and a second indication from the second wireless communication device, the first indication being used to instruct the first wireless communication device to perform wireless transmission to the second wireless communication device a first precoding matrix, the second indication being used to instruct the first wireless communications device to perform a second precoding matrix used for wireless transmission to the second wireless communications device;

The first precoding matrix includes information that the first wireless communication device performs a beam used for wireless transmission to the second wireless communication device, the first precoding matrix being attributed to the first wireless communication The device performs a first codebook used for wireless transmission to the second wireless communication device;

The second precoding matrix includes information of a phase difference used by the first wireless communication device, the second precoding matrix being attributed to the first wireless communication device performing to the second wireless communication device The second codebook used for wireless transmission.
The method for indicating a precoding matrix according to claim 1, comprising:

The precoding vector included in each precoding matrix in the first codebook is a discrete Fourier transform vector, or

Each precoding matrix in the first codebook includes a precoding vector corresponding to at least one wide beam or at least one narrow beam.
The precoding matrix indication method according to claim 1 or 2, comprising:

A part of the elements of the at least one precoding vector in the first codebook is 0; another part of the precoding vector is a discrete Fourier transform vector, or the other part of the element is based on Glassman packing theory Designed precoding vector.
The precoding matrix indication method according to claim 2 or 3, wherein the discrete Fourier transform vector is designed as:

or,

Where N is the number of antenna ports of the sounding reference signal, O is an integer greater than or equal to 1, indicating an oversampling factor, m is the number of the vector, corresponding codebook index, π is the pi, e is the natural constant, and j is the imaginary unit. , [·] T represents the conjugate transpose operation.
The method for indicating a precoding matrix according to any one of claims 1-4, comprising:

The first indication and the second indication are included in physical layer signaling from the second wireless communications apparatus, where the physical layer signaling includes a first indication domain and a second indication domain, the first The indication field includes the first indication, and the second indication field includes the second indication.
The method for indicating a precoding matrix according to any one of claims 1-4, comprising:

The first indication and the second indication are included in physical layer signaling from the second wireless communications apparatus, the physical layer signaling includes an indication domain, and the one indication domain includes the first The indication and the second indication.
The precoding matrix indication method according to any one of claims 1 to 4, wherein the first indication and the second indication are included in a high layer signaling from the second wireless communication device. The high layer signaling includes a first indication field and a second indication field, the first indication field includes the first indication, and the second indication field includes the second indication.
The precoding matrix indication method according to any one of claims 1 to 4, wherein the first indication and the second indication are included in a high layer signaling from the second wireless communication device. The high layer signaling includes an indication field, the one indication field including the first indication and the second indication.
The method for indicating a precoding matrix according to any one of claims 1 to 4, wherein the first wireless communication device acquires the first indication and the second indication from the second wireless communication device, including:

The first indication is included in a first signaling from the second wireless communication device,

The first wireless communication device receives second signaling from the second wireless communication device, the second signaling including the second information indicating a time-frequency resource used in a data channel,

The first wireless communication device demodulates and obtains the second indication according to the information of the time-frequency resource included in the second signaling.
The precoding matrix indication method according to any one of claims 1-9, wherein when the number of transmission layers is 1, the first codebook is designed as:
The precoding matrix indication method according to any one of claims 1 to 10, wherein the second codebook is designed to:

Codebook index The number of transmission layers is 1 0 [1 1] T 1 [1 -1] T 2 [1 +j] T 3 [1 -j] T

Where T represents a matrix transpose, and 1, -1, +j, -j are quadrature amplitude modulation character sets.
The precoding matrix indication method according to any one of claims 1-9, wherein when the number of transmission layers is 1, the first codebook and the second codebook are designed as:

among them,
P represents a factor that normalizes the precoding vector power in the codebook.
The precoding matrix indication method according to any one of claims 1 to 12, wherein

The phase difference information includes information of a phase difference of a cross-polarized antenna, or information of a phase difference between a plurality of beams.
The precoding matrix indication method according to any one of claims 1 to 13, characterized in that

The first codebook and the second codebook are pre-configured in the first wireless communication device and/or the second wireless communication device.
The precoding matrix indication method according to any one of claims 1 to 14, wherein

The wide beam is an analog beam, or a beam corresponding to an antenna virtualization weight, or a beam formed when the number of antenna ports/the number of antenna elements is small;

The narrow beam is a beam formed by a mixture of digital analog weights, or a beam formed by digital weights.
A first wireless communication device, comprising:

At least one processor, memory, transceiver and bus system, said processor, said memory, said transceiver being coupled by a bus system, said first wireless communication device being in communication with said second wireless communication device via said transceiver Communication, the memory for storing program instructions, the at least one processor for executing the program instructions stored in the memory, such that the first wireless communication device completes any of claims 1-15 The precoding matrix indicates a portion of the method performed by the first wireless communication device.
A second wireless communication device, comprising:

At least one processor, memory, transceiver and bus system, said processor, said memory, said transceiver being coupled by a bus system, said second wireless communication device being in communication with said first wireless communication device via said transceiver Communication, the memory for storing program instructions, the at least one processor for executing the program instructions stored in the memory, such that the second wireless communication device completes any of claims 1-15 The precoding matrix indicates a portion of the method performed by the second wireless communication device.