WO2022067561A1

WO2022067561A1 - Communication method, terminal device, network device and storage medium

Info

Publication number: WO2022067561A1
Application number: PCT/CN2020/119017
Authority: WO
Inventors: 张鹏; 许华; 马驰翔
Original assignee: 华为技术有限公司
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2022-04-07

Abstract

The embodiments of the present application disclose a communication method, a terminal device, a network device and a storage medium. Said method comprises: a first terminal device receiving downlink control information from a network device, the downlink control information carrying a transmission precoding matrix sequence number corresponding to a precoding matrix in a codebook used by the first terminal device, the codebook used by the first terminal device being a first codebook, the first codebook being a codebook used by at least two terminal devices sending the same data to be sent, and the first terminal device belonging to the at least two terminal devices; the first terminal device acquiring the precoding matrix corresponding to the transmission precoding matrix sequence number in the codebook used by the first terminal device; and the first terminal device sending an uplink data signal to the network device. This means significantly enhances the transmission rate and reliability of source user equipment (UE). Furthermore, different UEs can send the same signal on the same time-frequency resource, avoiding strong interference between the UEs.

Description

A communication method, terminal device, network device and storage medium

technical field

The present application relates to the field of communication technologies, and in particular, to a communication method, a terminal device, a network device, and a storage medium.

Background technique

User collaboration is one of the main features supported by next-generation communication systems, which can significantly improve the system capacity and network coverage. For uplink user collaboration, the user-side distributed Multi Input Multi Output (MIMO) technology is used to improve the uplink capacity.

There is a non-cooperative single-user multiple-input multiple-output (Single User MIMO, SU-MIMO) codebook in the prior art. For SU-MIMO, a user equipment (User Equipment, UE) has at least two transmit ports, and at least one data block (Transport Block, TB) of the user equipment is mapped to the transmit ports of the UE through a precoding matrix. As shown in formula (1), it is assumed that 1 TB is transmitted on two layers respectively, and the data of the two layers comes from the TB. The data of layer 1 and layer 2 are s1 and s2 respectively. If the UE has a total of If there are 4 transmit ports, a 4x2 precoding matrix W is required, the TB is mapped to the 4 ports through the precoding matrix W, and the signals transmitted by the 4 ports are x1, x2, x3, and x4.

However, the codebook of SU-MIMO is not designed for distributed MIMO. Existing techniques do not support codebooks used by distributed MIMO, nor do they support instructing the UE to use precoding matrices in such codebooks.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a communication method, a terminal device, a network device, and a storage medium, which can support a codebook used by distributed MIMO.

A first aspect of the embodiments of the present application provides a communication method, including: a first terminal device receiving downlink control information from a network device, where the downlink control information carries precoding in a codebook used by the first terminal device The sequence number of the transmission precoding matrix corresponding to the matrix, wherein the codebook used by the first terminal device is the first codebook, and the first codebook is the codebook used by at least two terminal devices that transmit the same data to be sent, The first terminal device belongs to the at least two terminal devices; the first terminal device obtains the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device; the first terminal device A terminal device sends an uplink data signal to the network device, wherein the uplink data signal is obtained according to the data to be sent by the first terminal device and the precoding matrix.

Through the embodiments of the present application, the terminal device receives the downlink control information sent by the network device, the downlink control information carries the sequence number of the transmission precoding matrix corresponding to the terminal device, and then the terminal device receives the precoding matrix corresponding to the sequence number of the transmission precoding matrix and the precoding matrix to be sent. The data determines the upstream data signal. The codebook used by the terminal device is a codebook used by at least two terminal devices that transmit the same data to be sent. That is to say, the above-mentioned data to be sent is simultaneously sent by at least two terminal devices through joint precoding. The above-mentioned means can be applied to a distributed MIMO system, and it is convenient for the terminal device to correctly read the precoding matrix used in the distributed MIMO technology.

On the other hand, in this solution, the transmission rate and reliability of the source user equipment SUE can be significantly enhanced through user cooperative transmission. Moreover, since the data is simultaneously sent by the SUE and the CUE through joint precoding, the power and the number of antennas used by the source user equipment and the cooperative user equipment are more than those used by a single user equipment, which can improve the data signal at the base station. The received signal-to-interference and noise ratio SINR, and improve the receiving performance. For example, a lower packet error rate BLER can be obtained; or, under the condition of the same BLER, the transmitted TB can carry more bit information.

Wherein, the downlink control information carries first bit information, and the first bit information indicates the sequence number of the transmission precoding matrix, and the method further includes: the first terminal device receives the first information from the network device. command, the first signaling is used to indicate that the transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the first terminal device; the first terminal device obtains the The precoding matrix corresponding to the sequence number of the transmission precoding matrix in the codebook used by the first terminal device includes: the first terminal device determining the precoding matrix corresponding to the sequence number of the transmission precoding matrix according to the first signaling The matrix is a precoding matrix corresponding to the first terminal device.

Wherein, the method further includes: the first terminal device receives second signaling from the network device, where the second signaling is used to indicate the first signal of the precoding matrix corresponding to the serial number of the transmission precoding matrix The element corresponding to the number of rows is the precoding matrix corresponding to the first terminal device; the first terminal device obtains the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device , including: the first terminal device determines, according to the second signaling, that the elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix sequence number are the precoding matrix corresponding to the first terminal device . Among them, this solution only takes the elements corresponding to the first number of rows as an example for description, which may also be the first number of elements, or the first number of columns, etc., or any other form, this solution does not Make specific restrictions.

Further, the method further includes: receiving, by the first terminal device, third signaling from the network device, where the third signaling is used to indicate that the precoding matrix in the first terminal device is applied The first terminal device obtains the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device, including: the first terminal device according to the third signaling Determining the port to which the precoding matrix is applied in the first terminal device; wherein, the sending, by the first terminal device, an uplink data signal to the network device includes: the first terminal device extracting data from the precoding matrix The applied port sends an uplink data signal to the network device.

Wherein, the downlink control information also carries phase difference information corresponding to the first terminal device, and the method further includes: the first terminal device according to the phase difference information and precoding corresponding to the first terminal device The matrix obtains the first precoding matrix; the first precoding matrix is recorded as the precoding matrix corresponding to the serial number of the transmission precoding matrix.

Further, the method further includes: the first terminal device receives fourth signaling from the network device, where the fourth signaling is used to indicate that the first phase difference information is the first terminal device corresponding phase difference information; obtaining, by the first terminal device, the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device, including: the first terminal device according to the first terminal device Four signaling determines the phase difference information corresponding to the first terminal device.

The first terminal device updates and modifies the precoding matrix corresponding to the first terminal device according to the phase difference information, thereby obtaining the modified precoding matrix corresponding to the first terminal device. Through the embodiment of the present application, by introducing a phase difference, the UE is notified to apply the phase difference to the corresponding precoding matrix to perform phase difference compensation, so as to overcome the phase difference caused by actual factors, and thus obtain better performance.

A second aspect of the embodiments of this application provides a communication method, including: a network device sending downlink control information to a first terminal device and/or at least one second terminal device, where the downlink control information carries the first terminal device the sequence number of the first transmission precoding matrix corresponding to the precoding matrix in the used codebook, and/or the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device, The codebook used by the first terminal device and/or the at least one second terminal device is a first codebook, and the first codebook is a code used by at least two terminal devices that transmit the same data to be sent In this case, the first terminal device and/or the at least one second terminal device belong to the at least two terminal devices; the network device receives information from the first terminal device and/or the at least one second terminal The upstream data signal of the device.

With the embodiments of the present application, the network device sends downlink control information to the terminal device, where the downlink control information carries the sequence number of the first transmission precoding matrix corresponding to the precoding matrix in the codebook used by the terminal device, so that the terminal device can The precoding matrix corresponding to the transmission precoding matrix serial number and the data to be sent determine the uplink data signal. The codebook used by the terminal device is a codebook used by at least two terminal devices that transmit the same data to be sent. The above-mentioned means can be applied to a distributed MIMO system, so that the terminal device can correctly read the precoding matrix used in the distributed MIMO technology.

On the other hand, in this solution, the transmission rate and reliability of the source user equipment SUE can be significantly enhanced through user cooperative transmission. Since the data signal is sent by the SUE and the CUE at the same time through joint precoding, the power and the number of antennas used by the source user equipment and the cooperative user equipment are more than those used by a single user equipment, which can improve the data signal at the base station. Receive signal-to-interference and noise ratio SINR and improve reception performance. For example, a lower packet error rate BLER can be obtained; or, under the condition of the same BLER, the transmitted TB can carry more bit information.

The downlink control information carries first bit information, where the first bit information indicates the sequence number of the first transmission precoding matrix, and/or second bit information, where the second bit information indicates the second transmitting a precoding matrix sequence number, the method further includes: sending, by the network device, first signaling, where the first signaling is used to indicate that the first transmission precoding matrix sequence number indicated by the first bit information is the The sequence number of the transmission precoding matrix corresponding to the first terminal device, and/or, used to indicate that the sequence number of the second transmission precoding matrix indicated by the second bit information is the transmission precoding matrix corresponding to the at least one second terminal device. Encoding matrix serial number.

Optionally, the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix are the same.

The method further includes: the network device sending second signaling, where the second signaling is used to indicate elements corresponding to the first number of rows of the precoding matrix corresponding to the sequence number of the first transmission precoding matrix is the precoding matrix corresponding to the first terminal device, and/or, the elements corresponding to the second number of rows of the precoding matrix used to indicate the sequence number of the second transmission precoding matrix are the at least one second The precoding matrix corresponding to the terminal device.

Further, the method further includes: sending, by the network device, third signaling, where the third signaling is used to indicate the port to which the precoding matrix is applied in the first terminal device, and/or, using is used to indicate the port to which the precoding matrix is applied in the at least one second terminal device.

Further, the downlink control information also carries the port to which the precoding matrix is applied in the first terminal device, and/or the port to which the precoding matrix is applied in the at least one second terminal device.

The downlink control information further carries first phase difference information corresponding to the first terminal device, and/or second phase difference information corresponding to the at least one second terminal device.

Through the embodiment of the present application, by introducing the phase difference, the UE is notified to apply the phase difference to the corresponding precoding matrix to perform phase difference compensation, so as to overcome the phase difference caused by actual factors, and then obtain better performance.

Further, the method further includes: the network device sending fourth signaling, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the first terminal device, and/ Or, it is used to indicate that the second phase difference information is phase difference information corresponding to the at least one second terminal device.

A third aspect of the embodiments of the present application provides a terminal device, including: a receiving unit configured to receive downlink control information from a network device, where the downlink control information carries a precoding matrix in a codebook used by the terminal device The corresponding transmission precoding matrix sequence number, wherein the codebook used by the terminal device is the first codebook, and the first codebook is the codebook used by at least two terminal devices that transmit the same data to be sent, and the terminal The device belongs to the at least two terminal devices; a determining unit is configured to obtain a precoding matrix corresponding to the sequence number of the transmission precoding matrix in the codebook used by the terminal devices; a sending unit is configured to send the network device to The uplink data signal, wherein the uplink data signal is obtained according to the data to be sent by the terminal device and the precoding matrix.

Wherein, the downlink control information carries first bit information, the first bit information indicates the sequence number of the transmission precoding matrix, the receiving unit is further configured to receive the first signaling from the network device, the first bit information A signaling is used to indicate that the transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the terminal device; the determining unit is configured to determine the transmission precoding matrix sequence number according to the second signaling. The elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix serial number are the precoding matrix corresponding to the terminal device.

The receiving unit is further configured to receive second signaling from the network device, where the second signaling is used to indicate that the first number of rows of the precoding matrix corresponding to the transmission precoding matrix serial number correspond to The element is the precoding matrix corresponding to the terminal device; the determining unit is configured to determine, according to the second signaling, that the elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix sequence number are the The precoding matrix corresponding to the terminal device.

Further, the receiving unit is further configured to receive third signaling from the network device, where the third signaling is used to indicate the port to which the precoding matrix is applied in the terminal device; the determining unit , for determining the port to which the precoding matrix is applied in the terminal device according to the third signaling; wherein, the sending unit is configured to send the network device from the port applied by the precoding matrix to the network device Send upstream data signals.

Further, the downlink control information also carries phase difference information corresponding to the terminal device, and the determining unit is further configured to: obtain a first precoding matrix according to the phase difference information and a precoding matrix corresponding to the terminal device ; Denote the first precoding matrix as the precoding matrix corresponding to the serial number of the transmission precoding matrix.

Further, the receiving unit is further configured to receive fourth signaling from the network device, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the terminal device; The determining unit is configured to determine the phase difference information corresponding to the terminal device according to the fourth signaling.

A fourth aspect of the embodiments of the present application provides a network device, including: a sending unit configured to send downlink control information to a first terminal device and/or at least one second terminal device, where the downlink control information carries the first terminal device The sequence number of the first transmission precoding matrix corresponding to the precoding matrix in the codebook used by a terminal device, and/or the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device Matrix sequence number, wherein the codebook used by the first terminal device and/or the at least one second terminal device is the first codebook, and the first codebook is at least two terminal devices that send the same data to be sent a codebook used, the first terminal device and/or the at least one second terminal device belong to the at least two terminal devices; a receiving unit for receiving data from the first terminal device and/or the at least two terminal devices An upstream data signal of a second terminal device.

The downlink control information carries first bit information, where the first bit information indicates the sequence number of the first transmission precoding matrix, and/or second bit information, where the second bit information indicates the second transmission precoding matrix sequence number, the sending unit is further configured to: send first signaling, where the first signaling is used to indicate that the first transmission precoding matrix sequence number indicated by the first bit information is the first transmission precoding matrix sequence number A sequence number of a transmission precoding matrix corresponding to a terminal device, and/or, used to indicate that the sequence number of the second transmission precoding matrix indicated by the second bit information is a transmission precoding matrix corresponding to the at least one second terminal device serial number.

The sending unit is further configured to: send second signaling, where the second signaling is used to indicate that the elements corresponding to the first number of rows of the precoding matrix corresponding to the sequence number of the first transmission precoding matrix are the the precoding matrix corresponding to the first terminal device, and/or, for indicating that the elements corresponding to the second number of rows of the precoding matrix corresponding to the second transmission precoding matrix sequence number are the at least one second terminal device the corresponding precoding matrix.

Further, the sending unit is further configured to: send third signaling, where the third signaling is used to indicate the port to which the precoding matrix is applied in the first terminal device, and/or, used to indicate The port to which the precoding matrix is applied in the at least one second terminal device.

The sending unit is further configured to: send fourth signaling, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the first terminal device, and/or, used to indicate The second phase difference information is phase difference information corresponding to the at least one second terminal device.

A fifth aspect of the embodiments of the present application provides a communication apparatus, including a processor, the processor is coupled to at least one memory, and the processor is configured to read a computer program stored in the at least one memory to execute the method described.

A sixth aspect of the embodiments of the present application provides a computer-readable storage medium, where the computer-readable storage medium is used to store a computer program, and when the computer program is run on a computer, the computer is made to execute the described method.

A seventh aspect of the embodiments of the present application provides a chip, including a processor and a communication interface, where the processor is configured to read an instruction to execute the method.

An eighth aspect of the embodiments of the present application provides a communication system, including the terminal device and the network device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the accompanying drawings involved in the embodiments or the background technology of the present application will be briefly introduced below.

FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application;

FIG. 2 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of downlink control information provided by an embodiment of the present application;

4 is a schematic diagram of a precoding matrix provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of a communication method provided by an embodiment of the present application;

6 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 7 is a schematic flowchart of a communication method provided by an embodiment of the present application;

8 is a schematic diagram of a modified precoding matrix provided by an embodiment of the present application;

9 is a schematic diagram of a single layer precoding matrix provided by an embodiment of the present application;

FIG. 10 is a schematic flowchart of a communication method provided by an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a network device according to an embodiment of the present application;

FIG. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

Referring to FIG. 1 , it is a schematic diagram of a communication system according to an embodiment of the present application. The communication system may include one or more network devices (only 1 shown) and at least two user equipments UE (only 2 shown) connected to the network devices.

A network device may be a device capable of communicating with terminal devices. The network device can be any device with wireless transceiver function. Including but not limited to: base station NodeB, evolved base station eNodeB, base station in the fifth generation (5G) communication system, base station or network equipment in future communication system, access node in WiFi system, wireless relay nodes, wireless backhaul nodes, etc. The network device may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario. The network device may also be a small station, a transmission reference point (transmission reference point, TRP), and the like. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

Terminal equipment is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water, such as ships; it can also be deployed in the air, such as aircraft, Balloons and satellites, etc. The terminal device can be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (Virtual Reality, VR) terminal device, an augmented reality (Augmented Reality, AR) terminal device, industrial control ( Wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety Wireless terminals, wireless terminals in smart cities, wireless terminals in smart homes, and so on. The embodiments of the present application do not limit application scenarios. Terminal equipment may also sometimes be referred to as user equipment (UE), access terminal equipment, UE unit, mobile station, mobile station, remote station, remote terminal equipment, mobile device, terminal, wireless communication device, UE Proxy or UE device etc.

It should be noted that the terms "system" and "network" in the embodiments of the present invention may be used interchangeably. "Plurality" refers to two or more than two, and in view of this, in the embodiment of the present invention, "plurality" may also be understood as "at least two". "And/or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, and B exists alone. In addition, the character "/", unless otherwise specified, generally indicates that the related objects are an "or" relationship.

This application applies to uplink (terminal equipment to network equipment) in communication systems.

The distributed MIMO means that at least two user equipments send at least one same data block in a joint precoding manner.

The embodiments of the present application may be applied to a user collaboration system. Wherein, the user cooperation system may include at least two user equipments. Specifically, it may include source user equipment (source User Equipment, SUE) and cooperative user equipment (Cooperation User Equipment, CUE). The source user equipment and the cooperating user equipment belong to the same user cooperation group. The source user equipment and the cooperative user equipment perform uplink distributed MIMO cooperative transmission under the uplink scheduling signaling sent by the base station. The uplink scheduling signaling is carried on a dedicated physical control channel (Physical Dedicated Control Channel, PDCCH). The source user equipment SUE forwards at least one data block TB that needs to be assisted in transmission by the cooperative user equipment CUE to the CUE through a sidelink (Sidelink, SL). Then, the SUE and the CUE send at least one uplink data signal through joint precoding on the Physical Uplink Shared Channel (PUSCH) according to the scheduling of the base station. In this solution, through user cooperative transmission, the transmission rate and reliability of the source user equipment SUE can be significantly enhanced. In addition, different UEs can send the same signal on the same time-frequency resource to avoid strong interference between UEs.

Since this/these TBs are simultaneously sent by the SUE and the CUE through joint precoding, the power and the number of antennas used by the source user equipment and the cooperative user equipment are both higher than those used by a single user equipment, which can improve the performance of the TB at the base station. Signal to Interference and Noise Ratio (SINR), and improve the reception performance. For example, a lower packet error rate (Block Error Rate, BLER) can be obtained; or, under the condition of the same BLER, the transmitted TB can carry more bit information.

The following describes a specific implementation manner of the communication method provided by the embodiments of the present application.

Referring to FIG. 2 , a communication method is provided in an embodiment of the present application. It includes steps 201-202, as follows:

201. A network device sends downlink control information to a first terminal device and/or at least one second terminal device, where the downlink control information carries a first transmission precoding corresponding to a precoding matrix in a codebook used by the first terminal device. The sequence number of the coding matrix, and/or the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device, wherein the first terminal device and/or the at least one The codebook used by the second terminal device is a first codebook, and the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent. The first terminal device and/or the at least one The second terminal device belongs to the at least two terminal devices;

Wherein, the above-mentioned step 201 may include any one of the following forms:

The network device sends downlink control information to the first terminal device, where the downlink control information carries the sequence number of the first transmission precoding matrix corresponding to the precoding matrix in the codebook used by the first terminal device.

Alternatively, the network device sends downlink control information to at least one second terminal device, where the downlink control information carries the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device.

Or, the network device sends downlink control information to the first terminal device and at least one second terminal device, where the downlink control information carries the first transmission precoding matrix corresponding to the precoding matrix in the codebook used by the first terminal device The sequence number, which is the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device.

That is, a network device such as a base station may send downlink control information to the first terminal device and the at least one second terminal device in a unicast manner, respectively. The downlink control information may also be sent to the first terminal device and the at least one second terminal device in a multicast manner. This plan does not make any specific restrictions on this.

Wherein, the above-mentioned first terminal device may be source user equipment. The second terminal device may be collaborative user equipment. There may be one or more cooperating user equipments. Alternatively, the first terminal device may be the cooperating user equipment, and the second terminal device may be the source user equipment or the like.

Codebook, that is, a collection of precoding matrices. Among them, the codebook is pre-stored in each terminal device. Each precoding matrix in the codebook has a serial number, which is the serial number of the transmission precoding matrix (Transmitted Precoding Matrix Indicator, TPMI).

The codebook may include a first codebook and a second codebook. The first codebook is a codebook used by at least two terminal devices that send the same data to be sent. Optionally, the foregoing first codebook may be referred to as a cooperative codebook.

The above-mentioned second codebook is a codebook used when the UE only sends its own data, that is to say, in the scenario where the second codebook is used, there are no at least two UEs that send the same data to be sent. It may be a common codebook in the prior art, or a non-cooperative codebook or the like.

Wherein, a network device such as a base station can determine the used codebook according to the following attributes: the number of ports for transmitting data signals, the number of layers, and the attribute of cooperative precoding.

The above-mentioned number of ports for transmitting data signals is the number of ports used by terminal devices that transmit the same data to be transmitted.

Among them, in the uplink and downlink transmission process, the base station will allocate a certain number of parallel data streams to each scheduled UE according to factors such as the channel conditions of each user equipment UE, and each data stream is called a layer.

The distributed MIMO communication provided by the embodiments of this solution uses the first codebook.

Wherein, as shown in Table 1, it is an example of the first codebook with 4 ports and 2 layers.

Table I

The user equipment UE may determine the codebook according to the corresponding codebook attribute, and determine the final used precoding matrix according to the TPMI.

The above-mentioned downlink control information (Downlink Control Information, DCI) may be carried on a physical downlink control channel (Physical Downlink Control Channel, PDCCH). The base station needs to inform the UE to use the first codebook. Among them, it can be indicated by the flag of DCI, for example, "1" represents the use of a cooperative codebook; or it can be configured by radio resource control (Radio Resource Control, RRC) signaling; or it can also be predefined by a protocol, such as using a group If the PDCCH is broadcast, it means that the first codebook is used. Among them, the multicast PDCCH can be identified by the RNTI (Radio Network Tempory Identity) agreed by the network and the terminal. In addition, this kind of flag can also be identified by the unicast RNTI agreed by the network and the terminal. The method of RNTI identification is different from the method of DCI identification. Specifically, the DCI is a set of bit domain information. Assuming that the DCI has 5 bits, through encoding, the encoded 10-bit information and the 4-bit check bit information (Cyclic Redundancy Check, CRC) are obtained. Then, the RNTI is an identifier applied to the 4-bit CRC information. Finally, the PDCCH carries 10-bit DCI encoded information and 4-bit CRC+RNTI information. Wherein, this solution does not specifically limit the above-mentioned specific implementation means.

Specifically, the downlink control information in step 201 carries first bit information, the first bit information indicates the sequence number of the first transmission precoding matrix, and/or second bit information, the second bit information indicates the the second transmission precoding matrix sequence number, the method further includes:

The network device sends first signaling, where the first signaling is used to indicate that the first transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the first terminal device , and/or, the second transmission precoding matrix sequence number indicated by the second bit information is the transmission precoding matrix sequence number corresponding to the at least one second terminal device.

Wherein, the above-mentioned first signaling may be radio resource control RRC signaling. The base station performs configuration through RRC signaling, so that the user equipment knows which transmission precoding matrix sequence number corresponds to which user equipment. Specifically, when the precoding matrices of the SUE and the CUE respectively use different TPMI indications, it is necessary to introduce the TPMI field corresponding to the SUE and the TPMI field corresponding to the CUE into the DCI.

For example, 1 SUE and 2 CUEs are performing distributed MIMO communication, and the number of bits corresponding to the TPMI of each device is 2. As shown in Figure 3, there is a 6-bit field in the DCI, b1b2b3b4b5b6. Wherein, every two bits indicate one TPMI.

Further, it can be specified that the first two bits b1b2 are the TMPI of the SUE, b3b4 is the TPMI of the first CUE, and b5b6 is the TPMI of the CUE2. Which bits correspond to which UE can be configured through RRC signaling. For example, unicast RRC signaling is used to respectively inform the SUE to apply the TPMI indicated by b1b2, CUE1 to apply the TPMI indicated by b3b4, and CUE2 to apply the TPMI indicated by b5b6. Alternatively, the network device sends RRC signaling through multicast, where the RRC signaling includes the UE IDs of all relevant UEs and the corresponding fields, wherein the SUE and CUE are informed by the group user IDs of the SUE and CUE which ones to read respectively. The bit is used as its own TPMI. For example, the RRC signaling configuration SUE ID corresponds to b1b2, CUE1ID corresponds to b3b4, and CUE2ID corresponds to b5b6. If each UE participating in the cooperation knows the ID numbers of all the cooperative UEs, it can also read the corresponding bits as the respective TPMI according to certain rules through protocol pre-definition or RRC signaling. For example, read the largest UE ID. The first two bits b1b2, the second largest read b3b4, the smallest read b5b6, etc., are not specifically limited in this solution.

The above-mentioned action of sending the first signaling may be performed before step 201 , or between step 201 and step 202 , or after step 201 , and may also be performed simultaneously with step 201 . This plan does not make any specific restrictions on this.

Wherein, when the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix are the same, that is, the precoding matrices of the SUE and the CUE are jointly designed, a TPMI may be used to indicate.

The jointly designed precoding matrix, that is, the precoding matrix includes the precoding matrixes corresponding to the SUE and the CUE respectively. Among them, the port number attribute of the codebook of the jointly designed precoding matrix is: the total number of ports that transmit data signals, that is, the sum of the number of ports of the SUE and CUE with the cooperative relationship, wherein, the sum of the number of ports with the cooperative relationship That is, the sum of the number of ports to which the precoding matrix is applied in each terminal device. For example, if two ports of one SUE and two ports of one CUE have a cooperative relationship, the number of ports in the cooperative codebook is 2+2=4. Wherein, the SUE/CUE itself may have at least two ports, and the base station may inform the SUE/CUE through RRC signaling or DCI signaling which ports it corresponds to have a cooperative relationship. The size of the precoding matrix in the cooperative codebook is the product of the total number of ports transmitting data signals and the number of layers. For example, the number of layers = 2, the precoding matrix size is 4 x 2.

Wherein, when it is indicated by a TPMI, the precoding matrix corresponding to each of the SUE and the CUE needs to be indicated by a pre-configured rule. For example, the SUE is instructed to take a certain X row in the joint precoding matrix as its own precoding matrix, where X is the number of ports of the SUE participating in the cooperation. The CUE takes a certain Y row in the joint precoding matrix as its own precoding matrix, where Y is the number of ports of the CUE participating in the cooperation. As shown in Figure 4, Figure 4 is a 4 x 2 joint precoding matrix, that is, the number of ports of the cooperative codebook is 4, and the number of layers is 2. Among them, the SUE has two ports participating in the cooperation, and it can be set that the SUE takes the first two rows of the joint precoding matrix as the joint precoding matrix corresponding to the SUE, namely W1 in Figure 4; the CUE takes the last two rows of the joint precoding matrix. row as its own precoding matrix, i.e. W2. Wherein, it can also be set that the SUE takes the last two rows of the joint precoding matrix as the joint precoding matrix corresponding to the SUE, namely W2 in FIG. 4; the CUE takes the first two rows in the joint precoding matrix as its own precoding matrix, i.e. W1. The SUE may also be set to take the first row and the third row of the joint precoding matrix, or any other two rows, etc., which is not specifically limited in this solution.

Wherein, the above-mentioned implementation means for indicating the precoding matrices corresponding to the SUE and the CUE can be configured through RRC signaling. For example, the SUE and the CUE are separately informed by using RRC signaling in a unicast manner, which rows in the joint precoding matrix are read as their own precoding matrix. For example, RRC signaling informs the UE how to read through the correspondence between the UE ID and the number of lines to be read. If each UE participating in the cooperation knows the ID numbers of all cooperative UEs, it can also read the corresponding number of rows as the respective precoding matrix according to certain rules by means of protocol pre-definition or RRC signaling. For example, the maximum UE ID The first two lines are read, the second largest reads the next two lines, etc. The above is only an exemplary description, and this solution does not specifically limit it.

Specifically, the network device may send the second signaling to indicate that the elements corresponding to the first number of rows of the precoding matrix corresponding to the first transmission precoding matrix sequence number are the precoding matrix corresponding to the first terminal device. The coding matrix, and/or, the elements corresponding to the second number of rows of the precoding matrix corresponding to the sequence number of the second transmission precoding matrix are the precoding matrix corresponding to the at least one second terminal device.

The above-mentioned second signaling may be RRC signaling. The above-mentioned first number may be, for example, the first xx rows of the precoding matrix, or from the xth row to the xx row, and so on. The second number can be the last xx rows, or from xxx to xxxx, etc. Through the above signaling, the SUE and the CUE can determine which rows in the joint precoding matrix are read as their own precoding matrix.

The method also includes:

The network device sends third signaling, where the third signaling is used to indicate the port to which the precoding matrix is applied in the first terminal device, and/or, is used to indicate the at least one second terminal The port to which the precoding matrix is applied in the device.

Alternatively, the downlink control information further carries the port to which the precoding matrix is applied in the first terminal device, and/or the port to which the precoding matrix is applied in the at least one second terminal device.

By informing the SUE and the CUE of the ports with the cooperation relationship, respectively, the SUE and the CUE respectively send data signals through the corresponding ports with the cooperation relationship.

202. The network device receives an uplink data signal from the first terminal device and/or the at least one second terminal device.

Specifically, the uplink data signal is obtained by the first user equipment according to the data to be sent and the precoding matrix corresponding to the sequence number of the first transmission precoding matrix, and/or the at least one second user equipment according to the precoding matrix. The data to be sent and the precoding matrix corresponding to the sequence number of the second transmission precoding matrix are obtained.

Wherein, the first user equipment and/or the at least one second user equipment determine a corresponding precoding matrix according to the above-mentioned transmission precoding matrix sequence number, and then obtain an uplink data signal according to the data to be sent and the precoding matrix, and send the uplink data signal to the base station.

On the other hand, in this solution, the transmission rate and reliability of the source user equipment SUE can be significantly enhanced through user cooperative transmission. Since the data signal is simultaneously sent by the SUE and the CUE through joint precoding, the power and the number of antennas used by the source user equipment and the cooperative user equipment are more than those used by a single user equipment, which can improve the data signal at the base station. Receive signal-to-interference and noise ratio SINR and improve reception performance. For example, a lower packet error rate BLER can be obtained; or, under the condition of the same BLER, the transmitted TB can carry more bit information.

The communication method provided by the embodiment of the present application is described in detail below. Referring to FIG. 5 , a communication method is provided in an embodiment of the present application. The communication method includes steps 501-502, which are as follows:

501. A network device sends downlink control information to a first terminal device and at least one second terminal device, where the downlink control information carries a first transmission precoding matrix corresponding to a precoding matrix in a codebook used by the first terminal device Sequence number, the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device, wherein the code used by the first terminal device and the at least one second terminal device This is a first codebook, the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, and the first terminal device and the at least one second terminal device belong to the at least two terminal devices. a terminal device;

The downlink control information may carry first bit information and second bit information, the first bit information indicates the sequence number of the first transmission precoding matrix, and the second bit information indicates the second transmission precoding matrix serial number;

As an implementation manner, the network device further sends first signaling, where the first signaling is used to indicate that the first transmission precoding matrix sequence number indicated by the first bit information is the first user equipment The corresponding transmission precoding matrix sequence number, and the second transmission precoding matrix sequence number indicated by the second bit information is the transmission precoding matrix sequence number corresponding to the at least one second user equipment. Alternatively, the network apparatus sends signaling to the first user equipment and the at least one second user equipment respectively, so as to notify the corresponding transmission precoding matrix sequence numbers of the respective devices.

As another implementation manner, the device ID number may be preset to correspond to the bit information from left to right in descending order.

The network device further sends third signaling, where the third signaling is used to indicate the port to which the precoding matrix is applied in the first terminal device, and the port to which the precoding matrix is applied in the at least one second terminal device. port to which the precoding matrix is applied.

By informing each terminal device of the port with the cooperation relationship, the terminal device sends the data signal through the corresponding port with the cooperation relationship.

Alternatively, the downlink control information further carries a port to which the precoding matrix is applied in the first terminal device, and a port to which the precoding matrix is applied in the at least one second terminal device.

That is to say, the port that informs each terminal apparatus that there is a cooperative relationship may be sent through RRC signaling or DCI.

The sequence numbers of the transmission precoding matrices of the above-mentioned terminal devices may be the same or different. That is, the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix may be the same or different. Wherein, when the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix are the same, the method may further include:

The network device sends second signaling, where the second signaling is used to indicate that elements corresponding to the first number of rows of the precoding matrix corresponding to the first transmission precoding matrix sequence number are corresponding to the first terminal device and the elements corresponding to the second number of rows of the precoding matrix corresponding to the sequence number of the second transmission precoding matrix are the precoding matrix corresponding to the at least one second terminal device.

The above is only an example, which can also be specified by the protocol, etc., such as pre-setting that each terminal device reads the corresponding number of rows according to a certain rule as the respective precoding matrix, for example, the UE ID reads the first two rows. , the second largest reads the next two lines, etc. The above is only an exemplary description, and this solution does not specifically limit it.

502. The network device receives an uplink data signal from the first terminal device and the at least one second terminal device.

Wherein, each terminal device can determine a precoding matrix according to the corresponding transmission precoding matrix serial number, and determine an uplink data signal according to the data to be sent and the precoding matrix, and then send the uplink data signal to the network device.

In the embodiment of the present application, the network device notifies the terminal devices of the transmission precoding matrix sequence numbers of the corresponding first codebooks through multicast, so that each terminal device determines the precoding matrix, and then sends an uplink data signal to the network device. This solution can be used for distributed MIMO, and the transmission rate and reliability of the source user equipment SUE can be significantly enhanced through user cooperative transmission. In addition, different terminal devices can transmit the same signal on the same time-frequency resource to avoid strong interference between the terminal devices.

Referring to FIG. 6 , another communication method is provided in this embodiment of the present application. The communication method includes steps 601-603, which are as follows:

601. A network device sends downlink control information to a first terminal device, where the downlink control information carries a sequence number of a first transmission precoding matrix corresponding to a precoding matrix in a codebook used by the first terminal device, wherein the first A codebook used by a terminal device is a first codebook, the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, and the first terminal device belongs to the at least two terminal devices ;

Optionally, the above-mentioned downlink control information carries first bit information, the first bit information indicates the sequence number of the first transmission precoding matrix, and the network device sends the first signaling, and the first signaling is used to indicate The first transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the first terminal device.

602. The network device sends downlink control information to at least one second terminal device, where the downlink control information carries the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device , wherein the codebook used by the at least one second terminal device is the first codebook, and the at least one second terminal device belongs to the at least two terminal devices;

Optionally, the above-mentioned downlink control information carries second bit information, the second bit information indicates the sequence number of the second transmission precoding matrix, and the network device sends the first signaling, and the first signaling is used to indicate The second transmission precoding matrix sequence number indicated by the second bit information is the transmission precoding matrix sequence number corresponding to the at least one second terminal device.

The sequence numbers of the transmission precoding matrices of the above-mentioned terminal devices may be the same or different. That is, the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix may be the same or different.

When the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix are the same, the method further includes:

The network device sends second signaling, where the second signaling is used to indicate that elements corresponding to the first number of rows of the precoding matrix corresponding to the first transmission precoding matrix sequence number are corresponding to the first terminal device and/or, the elements corresponding to the second number of rows of the precoding matrix corresponding to the second transmission precoding matrix sequence number are the precoding matrix corresponding to the at least one second terminal device.

The above method may be sent in a unicast manner, or may be transmitted in a multicast manner, which is not limited in this solution.

603. The network device receives an uplink data signal from the first terminal device and the at least one second terminal device.

Through the embodiments of the present application, the network device notifies the terminal devices of the transmission precoding matrix sequence numbers of the corresponding cooperative codebooks through unicast, so that each terminal device determines the precoding matrix, and then sends uplink data signals to the network device. This solution can be used for distributed MIMO, so that the terminal device can correctly read the precoding matrix used under the distributed MIMO technology, and then through user cooperative transmission, the transmission rate and reliability of the source user equipment SUE can be significantly enhanced. In addition, different terminal devices can transmit the same signal on the same time-frequency resource to avoid causing strong interference between the terminal devices.

The foregoing embodiments have introduced the means by which the network device notifies the terminal device of the sequence number of the transmission precoding matrix corresponding to the precoding matrix in the corresponding first codebook respectively. Further, due to practical factors such as distance difference or synchronization difference of devices between UEs, there may be a phase difference between the signal from the SUE to the network device and the signal from the CUE to the network device. This phase difference can cause performance degradation. To this end, on the basis of the foregoing embodiments, an embodiment of the present application further provides a communication method, as shown in FIG. 7 . The communication method includes steps 701-703, which are as follows:

701. A network device sends downlink control information to a first terminal device and at least one second terminal device, where the downlink control information carries a first transmission precoding matrix corresponding to a precoding matrix in a codebook used by the first terminal device Sequence number, the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device, wherein the code used by the first terminal device and the at least one second terminal device This is a first codebook, the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, and the first terminal device and the at least one second terminal device belong to the at least two terminal devices. terminal device; the downlink control information also carries first phase difference information corresponding to the first terminal device, and second phase difference information corresponding to the at least one second terminal device;

The terminal device may modify the determined precoding matrix based on the corresponding phase difference information, as shown in FIG. 8 . For example, the correction can be implemented by multiplying the precoding matrix used by the port corresponding to the terminal device by a phase.

702. The network device sends fourth signaling, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the first terminal device, and the second phase difference information is phase difference information corresponding to the at least one second terminal device;

The above-mentioned phase difference information may be carried in DCI or RRC signaling, and indicated by means of quantization. For example, introducing 2 bits corresponds to 4 different phases, namely 20°, 50°, 90°, 180°, or evenly dividing a certain angle, such as dividing 360° into 4 equal parts, etc. The corresponding relationship between the bit and the phase may be an RRC configuration or a protocol predefined. Which angle to use can be indicated by DCI.

Preferably, the phase difference of the CUE can be determined based on the SUE. That is, the phase difference corresponding to SUE is set to 0.

Specifically, the above-mentioned phase difference information can use a single-layer coding matrix, that is, a precoding matrix with only one column, as shown in FIG. 9 , which respectively correspond to four single-layer precoding matrices. The phase difference corresponding to the second row and the first row of each matrix is the phase difference information required by the cooperative precoding matrix. The first to fourth matrices in Figure 9 represent that the second port (the second row of the matrix) and the first port (the first row of the matrix) have 0°, 180°, 90°, -90° respectively. phase difference. The UE needs to be informed through RRC or a pre-defined manner of the protocol, which UE corresponds to the first port and which UE corresponds to the second port. Generally, the reference value is set to 1, that is, the phase difference between the element value of the matrix and the reference value is the phase difference that needs to be applied to the UE corresponding to the port.

For example, when it corresponds to the second matrix in FIG. 9, it means that the UE corresponding to the first port (ie, the first row) does not need to apply the phase difference (or the applied phase difference is 0), and the second port (ie, the first row) does not need to apply the phase difference. The phase difference of the UE corresponding to the second row) is 180°.

Wherein, the network device may notify the terminal device in the manner of Group PDCCH. For example, which phase difference is applied to the precoding matrix of which UE can be informed by protocol pre-definition or RRC signaling. For example, if there are 3 UEs for cooperation, and each UE corresponds to 2 bits to identify the phase difference, the DCI carried on the Group PDCCH has a 6-bit field. For example, the first two bits correspond to SUE, and the middle two bits correspond to CUE1. The last two bits correspond to CUE2. The correspondence between the location of each UE and the bit field can be configured through RRC signaling combined with UE ID, or through the UE ID size relationship protocol pre-defined or RRC signaling configuration, etc., which is not specifically limited in this solution . Further, it can be set that a certain UE (such as SUE) does not need to change the phase. Taking the UE as a benchmark, in the above scenario where the three UEs cooperate, only a 4-bit field is required for the three UEs. The above is just an example, which is not specifically limited in this solution.

703. The network device receives an uplink data signal from the first terminal device and the at least one second terminal device.

Wherein, the terminal device transmits the uplink data signal through the modified precoding matrix.

The embodiment of the present application uses a multicast method to notify, alternatively, the network device can also use a unicast method to notify, by directly introducing the phase difference field corresponding to each UE in the DCI, and carrying the phase difference information, So that each UE can modify its corresponding precoding matrix according to the phase difference information.

Through the embodiment of the present application, by introducing a phase difference, the UE is notified to apply the phase difference to the corresponding precoding matrix to perform phase difference compensation, so as to overcome the phase difference caused by actual factors, and thus obtain better performance.

Consistent with the foregoing embodiments, referring to FIG. 10 , a communication method is provided in an embodiment of the present application. It includes steps 1001-1003, as follows:

1001. A first terminal device receives downlink control information from a network device, where the downlink control information carries a transmission precoding matrix sequence number corresponding to a precoding matrix in a codebook used by the first terminal device, wherein the first terminal device The codebook used by the terminal device is a first codebook, the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, and the first terminal device belongs to the at least two terminal devices;

Wherein, the above-mentioned first terminal device may be any of the aforementioned terminal devices. That is, it can be a SUE or a CUE. This plan does not make any specific restrictions on this.

The above-mentioned first codebook is the codebook used by at least two terminal devices that transmit the same data to be sent, that is, the codebook used by any one of the at least two terminal devices that have a cooperative relationship is The above first codebook. The first codebook may also be called a cooperative codebook, which is not specifically limited in this solution.

The above-mentioned downlink control information may further carry the sequence number of the transmission precoding matrix corresponding to the precoding matrix in the codebook used by the second terminal device, where the second terminal device belongs to the at least two terminal devices. This plan does not make any specific restrictions on this.

Wherein, the downlink control information may carry first bit information, the first bit information indicates the sequence number of the transmission precoding matrix, the first terminal device receives the first signaling from the network device, the first bit information A signaling is used to indicate that the transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the first terminal device;

The first terminal device determines, according to the first signaling, that the precoding matrix corresponding to the transmission precoding matrix sequence number is the precoding matrix corresponding to the first terminal device.

Wherein, the above-mentioned first signaling may be radio resource control RRC signaling. The network device performs configuration through RRC signaling, so that the terminal device knows which transmission precoding matrix sequence number corresponds to which terminal device.

In this embodiment of the present application, the first terminal device further determines the sequence number of the transmission precoding matrix corresponding to the first terminal device by using the bit information carried in the downlink control information. The above only takes the first bit information as an example for description, and the downlink control information can also carry other bit information, such as second bit information, which is used to indicate that the transmission precoding matrix sequence number indicated by the second bit information is: The sequence number of the transmission precoding matrix corresponding to the second terminal device, etc.

The above is just an example, wherein the first terminal device may also be informed by means of protocol pre-definition or the like, that the above-mentioned transmission precoding matrix sequence number is the transmission precoding matrix corresponding to the precoding matrix in the codebook used by the first terminal device. Encoding matrix serial number. This plan does not make any specific restrictions on this.

1002. The first terminal device acquires a precoding matrix corresponding to the sequence number of the transmission precoding matrix in a codebook used by the first terminal device;

The first terminal device further determines the precoding matrix corresponding to the first terminal device according to the sequence number of the transmission precoding matrix.

Further, when the sequence number of the transmission precoding matrix corresponding to the first terminal device is the same as the sequence number of the transmission precoding matrix corresponding to the second terminal device, the method further includes:

The first terminal device receives second signaling from the network device, where the second signaling is used to indicate that the elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix sequence number are the the precoding matrix corresponding to the first terminal device;

The first terminal device determines, according to the second signaling, that elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix sequence number are the precoding matrix corresponding to the first terminal device.

That is, when the first terminal device and the second terminal device use a jointly designed precoding matrix, the first terminal device further determines the first terminal by receiving the second signaling from the network device The precoding matrix corresponding to the device.

For the introduction of the jointly designed precoding matrix and the like, reference may be made to the introduction of the foregoing embodiments, and details are not repeated here.

1003. The first terminal device sends an uplink data signal to the network device, where the uplink data signal is obtained according to the data to be sent by the first terminal device and the precoding matrix.

The first terminal device further obtains the uplink data signal according to the data to be sent and the precoding matrix.

The precoding matrix corresponding to the first terminal device is obtained through channel estimation, and there may be no correlation between the data to be sent and the precoding matrix corresponding to the first terminal device.

Wherein, the method also includes:

receiving, by the first terminal device, third signaling from the network device, where the third signaling is used to indicate a port to which the precoding matrix is applied in the first terminal device;

The first terminal device determines, according to the third signaling, a port to which the precoding matrix is applied in the first terminal device.

Further, the first terminal device sends an uplink data signal to the network device from the port to which the precoding matrix is applied.

Further, the downlink control information also carries phase difference information corresponding to the first terminal device, and the method further includes:

The first terminal device obtains a first precoding matrix according to the phase difference information and a precoding matrix corresponding to the first terminal device; and denote the first precoding matrix as the sequence number corresponding to the transmission precoding matrix the precoding matrix.

That is to say, the first terminal device updates and corrects the precoding matrix corresponding to the first terminal device according to the phase difference information, thereby obtaining the modified precoding matrix corresponding to the first terminal device.

The first terminal device receives fourth signaling from the network device, where the fourth signaling is used to indicate that the first phase difference information is phase difference information corresponding to the first terminal device;

The first terminal device determines phase difference information corresponding to the first terminal device according to the fourth signaling.

The above signaling may be RRC, which is not specifically limited in this solution.

Through the embodiments of the present application, the terminal device receives the downlink control information sent by the network device, the downlink control information carries the sequence number of the transmission precoding matrix corresponding to the terminal device, and then the terminal device receives the precoding matrix corresponding to the sequence number of the transmission precoding matrix and the precoding matrix to be sent. The data determines the upstream data signal. The codebook used by the terminal device is a codebook used by at least two terminal devices that transmit the same data to be sent. That is to say, the above-mentioned data to be sent is simultaneously sent by at least two terminal devices through joint precoding. The above-mentioned means can be applied to a distributed MIMO system, so that the terminal device can correctly read the precoding matrix used in the distributed MIMO technology.

As shown in FIG. 11 , an embodiment of the present application further provides a terminal device, including:

A receiving unit 1101, configured to receive downlink control information from a network device, where the downlink control information carries a transmission precoding matrix sequence number corresponding to a precoding matrix in a codebook used by the terminal device, wherein the The codebook is a first codebook, and the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, and the terminal devices belong to the at least two terminal devices;

a determining unit 1102, configured to acquire a precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the terminal device;

The sending unit 1103 is configured to send an uplink data signal to the network device, wherein the uplink data signal is obtained according to the data to be sent by the terminal device and the precoding matrix.

Wherein, the downlink control information carries first bit information, the first bit information indicates the sequence number of the transmission precoding matrix, and the receiving unit 1101 is further configured to receive the first signaling from the network device, the The first signaling is used to indicate that the transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the terminal device;

The determining unit 1102 is configured to determine, according to the second signaling, that elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix serial number are the precoding matrix corresponding to the terminal device.

The receiving unit 1101 is further configured to receive second signaling from the network device, where the second signaling is used to indicate that the first number of rows of the precoding matrix corresponding to the transmission precoding matrix sequence number correspond to The element of is the precoding matrix corresponding to the terminal device;

Wherein, the receiving unit 1101 is further configured to receive third signaling from the network device, where the third signaling is used to indicate the port to which the precoding matrix is applied in the terminal device;

the determining unit 1102, configured to determine the port to which the precoding matrix is applied in the terminal device according to the third signaling;

The sending unit 1103 is configured to send an uplink data signal to the network device from the port to which the precoding matrix is applied.

The downlink control information also carries the phase difference information corresponding to the terminal device, and the determining unit 1102 is further configured to:

obtaining a first precoding matrix according to the phase difference information and a precoding matrix corresponding to the terminal device;

The first precoding matrix is recorded as the precoding matrix corresponding to the serial number of the transmission precoding matrix.

The receiving unit 1101 is further configured to receive fourth signaling from the network device, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the terminal device;

The determining unit 1102 is configured to determine phase difference information corresponding to the terminal device according to the fourth signaling.

Referring to FIG. 12 , an embodiment of the present application further provides a network device, including:

A sending unit 1201, configured to send downlink control information to a first terminal device and/or at least one second terminal device, where the downlink control information carries a first terminal device corresponding to a precoding matrix in a codebook used by the first terminal device The sequence number of the transmission precoding matrix, and/or the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device, wherein the first terminal device and/or the A codebook used by at least one second terminal device is a first codebook, and the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, the first terminal device and/or the at least one second terminal device belongs to the at least two terminal devices;

A receiving unit 1202, configured to receive an uplink data signal from the first terminal device and/or the at least one second terminal device.

The downlink control information carries first bit information, where the first bit information indicates the sequence number of the first transmission precoding matrix, and/or second bit information, where the second bit information indicates the second To transmit the sequence number of the precoding matrix, the sending unit 1201 is further configured to:

Send first signaling, where the first signaling is used to indicate that the first transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the first terminal device, and/or , which is used to indicate that the second transmission precoding matrix sequence number indicated by the second bit information is the transmission precoding matrix sequence number corresponding to the at least one second terminal device.

The sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix are the same.

The sending unit 1201 is also used for:

Sending second signaling, where the second signaling is used to indicate that the elements corresponding to the first number of rows of the precoding matrix corresponding to the first transmission precoding matrix sequence number are the precoding matrix corresponding to the first terminal device , and/or elements corresponding to the second number of rows of the precoding matrix corresponding to the sequence number of the second transmission precoding matrix are the precoding matrix corresponding to the at least one second terminal device.

Wherein, the sending unit 1201 is also used for:

Sending third signaling, where the third signaling is used to indicate the port to which the precoding matrix is applied in the first terminal device, and/or, used to indicate the port in the at least one second terminal device The port to which the precoding matrix applies.

Alternatively, the downlink control information further carries the port to which the precoding matrix is applied in the first terminal device, and/or the port to which the precoding matrix is applied in the at least one second terminal device .

The downlink control information also carries first phase difference information corresponding to the first terminal device, and/or second phase difference information corresponding to the at least one second terminal device.

The sending unit 1201 is also used for:

Sending fourth signaling, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the first terminal device, and/or is used to indicate that the second phase difference information is Phase difference information corresponding to the at least one second terminal device.

As shown in FIG. 13 , an embodiment of the present application further provides a communication apparatus 1300, where the communication apparatus 1300 is configured to execute the above method. Part or all of the above methods can be implemented by hardware or software.

Optionally, the communication apparatus 1300 may be a chip or an integrated circuit during specific implementation.

Optionally, when part or all of the methods in the above embodiments are implemented by software, the communication apparatus 1300 includes: a memory 1302 for storing programs; a processor 1301 for executing programs stored in the memory 1302 , the communication apparatus 1300 A communication interface 1303 may also be included. When the program is executed, the communication apparatus 1300 can implement the methods provided by the above embodiments.

Optionally, the above-mentioned memory 1302 may be a physically independent unit, or may be integrated with the processor 1301 .

Optionally, when part or all of the methods in the foregoing embodiments are implemented by software, the communication apparatus 1300 may only include the processor 1301 . The memory 1302 for storing programs is located outside the communication device 1300 , and the processor 1301 is connected to the memory 1302 through circuits/wires or a communication interface 1303 for reading and executing programs stored in the memory 1302 .

The processor 1301 may be a central processing unit (CPU), a network processor (NP), or a combination of CPU and NP.

The processor 1301 may further include a hardware chip. The above-mentioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof. The above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a general-purpose array logic (generic array logic, GAL) or any combination thereof.

The memory 1302 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include non-volatile memory (non-volatile memory), such as flash memory (flash memory) ), a hard disk drive (HDD) or a solid-state drive (SSD); the memory may also include a combination of the above-mentioned types of memory.

An embodiment of the present application further provides a communication device, including a processor, where the processor is coupled to at least one memory, and the processor is configured to read a computer program stored in the at least one memory to execute the method.

Embodiments of the present application further provide a computer-readable storage medium, where the computer-readable storage medium is used for storing a computer program, and when the computer program runs on a computer, the computer is made to execute the method.

Embodiments of the present application further provide a chip, including a processor and a communication interface, where the processor is configured to read an instruction to execute the method.

Embodiments of the present application further provide a communication system, including the terminal device and the network device.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or Integration into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and 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 in this embodiment.

In addition, it is stated in the application that each functional unit in each embodiment may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware, and can also be implemented in the form of software program modules.

The integrated unit, if implemented in the form of a software program module and sold or used as a stand-alone product, may be stored in a computer readable memory. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art, or all or part of the technical solution, and the computer software product is stored in a memory, Several instructions are included to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned memory includes: U disk, read-only memory (ROM), random access memory (random access memory, RAM), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable memory, and the memory can include: a flash disk , read-only memory, random access memory, magnetic or optical disk, etc.

The embodiments of the present application have been introduced in detail above, and the principles and implementations of the present application are described in this paper by using specific examples. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application; at the same time, for Persons of ordinary skill in the art, based on the idea of the present application, will have changes in the specific implementation manner and application scope. In summary, the contents of this specification should not be construed as limitations on the present application.

Claims

A communication method, comprising:

The first terminal device receives downlink control information from a network device, where the downlink control information carries a transmission precoding matrix sequence number corresponding to a precoding matrix in a codebook used by the first terminal device, wherein the first terminal device The used codebook is a first codebook, and the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, and the first terminal device belongs to the at least two terminal devices;

acquiring, by the first terminal device, a precoding matrix corresponding to the sequence number of the transmission precoding matrix in the codebook used by the first terminal device;

The first terminal device sends an uplink data signal to the network device, where the uplink data signal is obtained according to the data to be sent by the first terminal device and the precoding matrix.
The method according to claim 1, wherein the downlink control information carries first bit information, and the first bit information indicates the sequence number of the transmission precoding matrix, and the method further comprises:

The first terminal device receives first signaling from the network device, where the first signaling is used to indicate that the transmission precoding matrix sequence number indicated by the first bit information corresponds to the first terminal device. The serial number of the transmission precoding matrix;

The first terminal device obtains the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device, including:

The first terminal device determines, according to the first signaling, that the precoding matrix corresponding to the transmission precoding matrix sequence number is the precoding matrix corresponding to the first terminal device.
The method according to claim 1, wherein the method further comprises:

The first terminal device receives second signaling from the network device, where the second signaling is used to indicate that the elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix sequence number are the the precoding matrix corresponding to the first terminal device;

The first terminal device obtains the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device, including:

The first terminal device determines, according to the second signaling, that elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix sequence number are the precoding matrix corresponding to the first terminal device.
The method according to any one of claims 1 to 3, wherein the method further comprises:

receiving, by the first terminal device, third signaling from the network device, where the third signaling is used to indicate a port to which the precoding matrix is applied in the first terminal device;

The first terminal device obtains the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device, including:

determining, by the first terminal device, a port to which the precoding matrix is applied in the first terminal device according to the third signaling;

Wherein, the first terminal device sends an uplink data signal to the network device, including:

The first terminal device sends an uplink data signal to the network device from the port to which the precoding matrix is applied.
The method according to any one of claims 1 to 4, wherein the downlink control information further carries phase difference information corresponding to the first terminal device, and the method further comprises:

obtaining, by the first terminal device, a first precoding matrix according to the phase difference information and a precoding matrix corresponding to the first terminal device;

The first precoding matrix is recorded as the precoding matrix corresponding to the serial number of the transmission precoding matrix.
The method according to claim 5, wherein the method further comprises:

receiving, by the first terminal device, fourth signaling from the network device, where the fourth signaling is used to indicate that the first phase difference information is phase difference information corresponding to the first terminal device;

The first terminal device obtains the precoding matrix corresponding to the serial number of the transmission precoding matrix in the codebook used by the first terminal device, including:

The first terminal device determines phase difference information corresponding to the first terminal device according to the fourth signaling.
A communication method, comprising:

The network device sends downlink control information to the first terminal device and/or at least one second terminal device, where the downlink control information carries the first transmission precoding matrix corresponding to the precoding matrix in the codebook used by the first terminal device sequence number, and/or the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device, wherein the first terminal device and/or the at least one second terminal device The codebook used by the terminal device is a first codebook, and the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, the first terminal device and/or the at least one second a terminal device belongs to the at least two terminal devices;

The network device receives an uplink data signal from the first terminal device and/or the at least one second terminal device.
The method according to claim 7, wherein the downlink control information carries first bit information, and the first bit information indicates the sequence number of the first transmission precoding matrix, and/or, the second bit information, The second bit information indicates the sequence number of the second transmission precoding matrix, and the method further includes:

The network device sends first signaling, where the first signaling is used to indicate that the first transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the first terminal device , and/or, the second transmission precoding matrix sequence number indicated by the second bit information is the transmission precoding matrix sequence number corresponding to the at least one second terminal device.
The method according to claim 7, wherein the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix are the same.
The method according to claim 9, wherein the method further comprises:

The network device sends second signaling, where the second signaling is used to indicate that elements corresponding to the first number of rows of the precoding matrix corresponding to the first transmission precoding matrix sequence number are corresponding to the first terminal device and/or, the elements corresponding to the second number of rows of the precoding matrix corresponding to the second transmission precoding matrix sequence number are the precoding matrix corresponding to the at least one second terminal device.
The method according to any one of claims 7 to 10, wherein the method further comprises:

The network device sends third signaling, where the third signaling is used to indicate the port to which the precoding matrix is applied in the first terminal device, and/or, is used to indicate the at least one second terminal The port to which the precoding matrix is applied in the device.
The method according to any one of claims 7 to 10, wherein the downlink control information further carries a port to which the precoding matrix in the first terminal device is applied, and/or the at least one The port to which the precoding matrix is applied in the second terminal device.
The method according to any one of claims 7 to 12, wherein the downlink control information further carries first phase difference information corresponding to the first terminal device, and/or the at least one second terminal The second phase difference information corresponding to the device.
The method of claim 13, wherein the method further comprises:

The network device sends fourth signaling, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the first terminal device, and/or is used to indicate the second phase difference information The phase difference information is phase difference information corresponding to the at least one second terminal device.
A terminal device, characterized in that it includes:

a receiving unit, configured to receive downlink control information from a network device, where the downlink control information carries a transmission precoding matrix sequence number corresponding to a precoding matrix in a codebook used by the terminal device, wherein the code used by the terminal device This is a first codebook, and the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, and the terminal devices belong to the at least two terminal devices;

a determining unit, configured to obtain a precoding matrix corresponding to the sequence number of the transmission precoding matrix in the codebook used by the terminal device;

A sending unit, configured to send an uplink data signal to the network device, wherein the uplink data signal is obtained according to the data to be sent by the terminal device and the precoding matrix.
The terminal device according to claim 15, wherein the downlink control information carries first bit information, the first bit information indicates a sequence number of the transmission precoding matrix, and the receiving unit is further configured to receive data from the the first signaling of the network device, where the first signaling is used to indicate that the transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the terminal device;

The determining unit is configured to determine, according to the second signaling, that elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix serial number are the precoding matrix corresponding to the terminal device.
The terminal device according to claim 15, wherein the receiving unit is further configured to receive second signaling from the network device, wherein the second signaling is used to indicate that the transmission precoding matrix sequence number corresponds to The elements corresponding to the first number of rows of the precoding matrix are the precoding matrix corresponding to the terminal device;

The determining unit is configured to determine, according to the second signaling, that elements corresponding to the first number of rows of the precoding matrix corresponding to the transmission precoding matrix serial number are the precoding matrix corresponding to the terminal device.
The terminal device according to any one of claims 15 to 17, wherein the receiving unit is further configured to receive third signaling from the network device, where the third signaling is used to instruct the terminal the port to which the precoding matrix is applied in the device;

the determining unit, configured to determine the port to which the precoding matrix is applied in the terminal device according to the third signaling;

The sending unit is configured to send an uplink data signal to the network device from the port to which the precoding matrix is applied.
The terminal device according to any one of claims 15 to 18, wherein the downlink control information further carries phase difference information corresponding to the terminal device, and the determining unit is further configured to:

obtaining a first precoding matrix according to the phase difference information and a precoding matrix corresponding to the terminal device;

The first precoding matrix is recorded as the precoding matrix corresponding to the serial number of the transmission precoding matrix.
The terminal device according to claim 19, wherein the receiving unit is further configured to receive fourth signaling from the network device, wherein the fourth signaling is used to indicate that the first phase difference information is phase difference information corresponding to the terminal device;

The determining unit is configured to determine phase difference information corresponding to the terminal device according to the fourth signaling.
A network device, comprising:

A sending unit, configured to send downlink control information to the first terminal device and/or at least one second terminal device, where the downlink control information carries the first transmission corresponding to the precoding matrix in the codebook used by the first terminal device The sequence number of the precoding matrix, and/or the sequence number of the second transmission precoding matrix corresponding to the precoding matrix in the codebook used by the at least one second terminal device, wherein the first terminal device and/or the at least one A codebook used by a second terminal device is a first codebook, and the first codebook is a codebook used by at least two terminal devices that transmit the same data to be sent, the first terminal device and/or the at least two terminal devices A second terminal device belongs to the at least two terminal devices;

A receiving unit, configured to receive an uplink data signal from the first terminal device and/or the at least one second terminal device.
The network device according to claim 21, wherein the downlink control information carries first bit information, and the first bit information indicates a sequence number of the first transmission precoding matrix, and/or, second bit information , the second bit information indicates the sequence number of the second transmission precoding matrix, and the sending unit is further configured to:

Send first signaling, where the first signaling is used to indicate that the first transmission precoding matrix sequence number indicated by the first bit information is the transmission precoding matrix sequence number corresponding to the first terminal device, and/or , which is used to indicate that the second transmission precoding matrix sequence number indicated by the second bit information is the transmission precoding matrix sequence number corresponding to the at least one second terminal device.
The network device according to claim 21, wherein the sequence number of the first transmission precoding matrix and the sequence number of the second transmission precoding matrix are the same.
The network device according to claim 23, wherein the sending unit is further configured to:

Sending second signaling, where the second signaling is used to indicate that the elements corresponding to the first number of rows of the precoding matrix corresponding to the first transmission precoding matrix sequence number are the precoding matrix corresponding to the first terminal device , and/or elements corresponding to the second number of rows of the precoding matrix corresponding to the sequence number of the second transmission precoding matrix are the precoding matrix corresponding to the at least one second terminal device.
The network device according to any one of claims 21 to 24, wherein the sending unit is further configured to:

Sending third signaling, where the third signaling is used to indicate the port to which the precoding matrix is applied in the first terminal device, and/or, used to indicate the port in the at least one second terminal device The port to which the precoding matrix applies.
The network device according to any one of claims 21 to 25, wherein the downlink control information further carries a port to which the precoding matrix in the first terminal device is applied, and/or the at least A port to which the precoding matrix is applied in a second terminal device.
The network device according to any one of claims 21 to 26, wherein the downlink control information further carries first phase difference information corresponding to the first terminal device, and/or the at least one second The second phase difference information corresponding to the terminal device.
The network device according to claim 27, wherein the sending unit is further configured to:

Sending fourth signaling, where the fourth signaling is used to indicate that the first phase difference information is the phase difference information corresponding to the first terminal device, and/or is used to indicate that the second phase difference information is Phase difference information corresponding to the at least one second terminal device.
A communication device, characterized by comprising a processor, the processor is coupled with at least one memory, and the processor is configured to read a computer program stored in the at least one memory, so as to execute the computer program according to claims 1 to 6 The method of any one of the claims, or the method of any one of claims 7 to 14 is performed.
A computer-readable storage medium, characterized in that the computer-readable storage medium is used to store a computer program, and when the computer program runs on a computer, the computer is made to execute any one of claims 1 to 6 The method described in claim 7, or the computer is caused to execute the method according to any one of claims 7-14.
A chip, characterized by comprising a processor and a communication interface, wherein the processor is configured to read instructions to execute the method described in any one of claims 1 to 6, or to execute any one of claims 7 to 14 the method described.
A communication system, characterized by comprising the terminal device according to any one of claims 15-20, and the network device according to any one of claims 21-28.