WO2023045723A1 - Communication method and apparatus, and device and storage medium - Google Patents

Abstract

Provided in the present application are a communication method and apparatus, and a device and a storage medium. The method comprises: a network device sending a downlink sounding signal to a terminal device; and the network device receiving a first downlink transmission matrix, which is sent by the terminal device, wherein the first downlink transmission matrix comprises n*m elements, the elements are used for indicating downlink channel information between one of n antennas of the network device and one of m antennas of the terminal device, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1. A first downlink transmission matrix can accurately reflect the channel information of a downlink channel, such that a network device performs pre-coding on the basis of the first downlink transmission matrix, thereby improving the air interface performance of the downlink channel.

Description

Communication method, device, device and storage medium

This application claims the priority of the Chinese patent application with the application number 202111109628.1 and the application name "communication method, device, equipment and storage medium" submitted to the China Patent Office on September 22, 2021, the entire contents of which are incorporated herein by reference. Applying.

technical field

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

Background technique

In some communication systems, such as the 5th generation wireless system (5G), network equipment needs to perform channel estimation on the downlink channel, and perform precoding according to the channel estimation result to transmit downlink information.

Currently, the network device sends a channel state information reference signal (CSIRS) to the terminal device in the process of channel estimation for the downlink channel, and the terminal device reports a precoding matrix indication (precoding matrix) to the network device based on the CSIRS. indicator, PMI), the network device performs precoding according to the PMI reported by the terminal device.

However, since the PMI is a quantized codebook, the downlink channel information indicated by the PMI has precision loss, and the network device performs precoding based on the PMI, which will lead to poor air interface performance of the downlink channel.

Contents of the invention

Embodiments of the present application provide a communication method, device, device, and storage medium in order to optimize air interface performance of a downlink channel.

In the first aspect, the embodiment of the present application provides a communication method, including: a network device sends a downlink detection signal to a terminal device; the network device receives a first downlink transmission matrix sent by the terminal device, and the first downlink transmission matrix It includes n*m elements, which are used to indicate the downlink channel information between one of the n antennas of the network device and one of the m antennas of the terminal device, and n is a positive integer greater than or equal to 1 , m is a positive integer greater than or equal to 1.

Through the communication method provided in the first aspect, the terminal device can send the first downlink transmission matrix to the network device. Compared with the PMI codebook, the first downlink transmission matrix can accurately reflect the channel information of the downlink channel, so that the network device Performing precoding based on the first downlink transmission matrix improves air interface performance of the downlink channel.

Network devices can use channel reciprocity to evaluate the accuracy of the first downlink transmission matrix by determining the degree of correlation between the first uplink channel information and the second uplink channel information, and determine whether the first downlink transmission matrix can accurately reflect For the information of the current downlink channel, when it is determined that the first downlink transmission matrix can reflect the information of the current downlink channel, precoding is performed based on the first downlink transmission matrix, and when it is determined that the first downlink transmission matrix cannot reflect the current In the case of downlink channel information, the downlink transmission matrix is reacquired. The reliability of downlink information transmission is improved. In this regard, the embodiment of this application provides the following two possible implementation modes:

In a first possible trial manner, the method further includes: a degree of correlation between the first uplink channel information and the second uplink channel information is greater than a first preset value, and the network device performs a pre-set based on the first downlink transmission matrix. Encoding; wherein, the first uplink channel information is determined based on receiving a first uplink sounding signal from the terminal device, and the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the first uplink sounding signal is determined based on receiving a second uplink sounding signal from the terminal device The time-domain position distance from the second uplink detection signal exceeds a preset time-domain threshold.

Through the communication method provided in this embodiment, when the degree of correlation between the first uplink channel information and the second uplink channel information is greater than the first preset value, the network device determines that the first downlink transmission matrix sent by the terminal device can still accurately reflect the Channel information of the current downlink channel. In this case, the network device performs precoding based on the first downlink transmission matrix. The transmission reliability of downlink information can be ensured.

In a possible implementation manner, the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and the method further includes: the network device sending first indication information to the terminal device, the first A piece of instruction information instructs the terminal device to send a second downlink transmission matrix between the network device and the terminal device, where the second downlink transmission matrix is used for precoding; wherein the first uplink channel information is based on receiving a second downlink transmission matrix from the terminal device The first uplink sounding signal is determined, the second uplink channel information is determined based on receiving the second uplink sounding signal from the terminal device, and the time domain position interval between the first uplink sounding signal and the second uplink sounding signal exceeds a preset time domain threshold.

Through the communication method provided in this embodiment, when the degree of correlation between the first uplink channel information and the second uplink channel information is less than the first preset value, the network device determines that the first downlink transmission matrix sent by the terminal device cannot accurately reflect the current downlink transmission matrix. Channel information for the channel. In this case, the network device no longer uses the first downlink transmission matrix for precoding, but needs to reacquire the downlink transmission matrix. The transmission reliability of downlink information can be ensured.

In a possible implementation manner, the degree of correlation between the first uplink channel information and the second uplink channel information is inversely proportional to the first difference, or proportional to the second difference; wherein, the first difference is the The difference between the correlation coefficient ρ and 1 between the first uplink channel information and the second uplink channel information, and the second difference is the difference between the correlation coefficient ρ and 0 between the first uplink channel information and the second uplink channel information .

In a possible implementation manner, the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , the first uplink channel information and the second uplink channel information The correlation coefficient ρ satisfies the formula:

Through the communication method provided in this embodiment, the network device can accurately determine the correlation coefficient ρ between the first uplink channel information and the second uplink channel information based on the above formula, and then determine whether the correlation coefficient ρ approaches the first preset value or the second The preset value is used to accurately estimate the degree of correlation between the first uplink channel information and the second uplink channel information.

In a possible implementation manner, the downlink sounding signal includes a CSIRS.

In a possible implementation manner, the first uplink sounding signal and/or the second uplink sounding signal includes a sounding reference signal (sounding reference signal, SRS).

In a possible implementation manner, the method further includes: the network device sending second indication information to the terminal device, where the second indication information is used to instruct the terminal device to send the first downlink transmission matrix.

Through the communication method provided by this embodiment, the terminal device only sends the first downlink transmission matrix when the network device sends the second indication information, which saves system overhead and improves the scheduling capability of the network device.

In a possible implementation manner, the network device sending the second indication information to the terminal device includes: the network device receiving report information sent by the terminal device, where the report information is used to indicate whether the terminal device supports sending the any A downlink transmission matrix: when the reported information indicates that the terminal device supports sending the downlink transmission matrix, the network device sends the second indication information to the terminal device.

Through the communication method provided by this embodiment, the terminal device sends reporting information to the network device to report whether it supports sending the downlink transmission matrix, and prevents the network device from sending indication information to the terminal device that does not support sending the downlink transmission matrix to instruct it to send the downlink transmission matrix, Reduced system overhead.

In a second aspect, an embodiment of the present application provides a communication method, including: a terminal device receives a downlink detection signal from a network device; the terminal device sends a first downlink transmission matrix to the network device, and the first downlink transmission matrix includes n*m elements, which are used to indicate downlink channel information between one of the n antennas of the network device and one of the m antennas of the terminal device, where n is a positive integer greater than or equal to 1, m is a positive integer greater than or equal to 1.

In a possible implementation manner, the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and the method further includes: the terminal device receiving first indication information from the network device, the The first indication information instructs the terminal device to send a second downlink transmission matrix between the network device and the terminal device, and the second downlink transmission matrix is used for precoding; wherein, the first uplink channel information is based on receiving The first uplink detection signal of the device is determined, the second uplink channel information is determined based on receiving the second uplink detection signal from the terminal device, and the time domain position interval between the first uplink detection signal and the second uplink detection signal exceeds a preset Time domain threshold.

In a possible implementation manner, the degree of correlation between the first uplink channel information and the second uplink channel information is inversely proportional to the difference between the correlation coefficient ρ and 1 between the first uplink channel information and the second uplink channel information, Or it is proportional to the difference between the correlation coefficient ρ and 0 between the first uplink channel information and the second uplink channel information.

In a possible implementation manner, the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , the first uplink channel information and the second uplink channel information The correlation coefficient ρ satisfies the formula:

In a possible implementation manner, the downlink sounding signal includes a channel state information reference signal CSIRS.

In a possible implementation manner, the first uplink sounding signal and/or the second uplink sounding signal includes a sounding reference signal SRS.

In a possible implementation manner, the method further includes: the terminal device receiving second indication information from the network device, where the second indication information is used to instruct the terminal device to send the first downlink transmission matrix.

In a possible implementation manner, before the terminal device receives the second indication information from the network device, it further includes: the terminal device sends reporting information to the network device, where the reporting information is used to indicate whether the terminal device supports Send any downlink transmission matrix.

The beneficial effects of the communication method provided by the above second aspect and each possible implementation manner of the above second aspect can be referred to the beneficial effects brought by the above first aspect and each possible implementation manner of the first aspect, here No longer.

In the third aspect, the embodiment of the present application provides a device, including a logic circuit and an input and output interface, wherein the input and output interface is used to receive signals from other communication devices other than the device and transmit them to the logic circuit or transmit signals from The signal of the logic circuit is sent to other communication devices other than the device, and the logic circuit is used to execute code instructions to implement the method in the first aspect, the second aspect or each possible implementation manner.

In a fourth aspect, an embodiment of the present application provides a communication device, including: a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and perform the tasks described in the first aspect, The method in the second aspect or each possible implementation manner.

In the fifth aspect, the embodiment of the present application provides a chip, including: a processor, configured to call and execute computer instructions from the memory, so that the device installed with the chip executes the first aspect, the second aspect, or each possible implementation methods in methods.

In a sixth aspect, the embodiments of the present application provide a computer-readable storage medium for storing computer program instructions, and the computer program causes a computer to execute the method in the first aspect, the second aspect, or each possible implementation manner.

In a seventh aspect, an embodiment of the present application provides a computer program product, including computer program instructions, which cause a computer to execute the method in the first aspect, the second aspect, or each possible implementation manner.

Description of drawings

FIG. 1 is a schematic structural diagram of a communication system applied in an embodiment of the present application.

FIG. 2 is a schematic flowchart of a communication method 200 provided by an embodiment of the present application.

FIG. 3 is a schematic diagram of a scene 400 of a MIMO array provided by the present application.

FIG. 4 is a schematic flowchart of a communication method 400 provided by an embodiment of the present application.

FIG. 5 is a schematic flowchart of a communication method 500 provided by an embodiment of the present application.

FIG. 6 is a schematic structural diagram of a communication device 600 provided by an embodiment of the present application.

FIG. 7 is another schematic block diagram of a communication device 700 provided by an embodiment of the present application.

Detailed ways

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

The communication method provided by this application can be applied to various communication systems, for example: Long Term Evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunication system (universal mobile telecommunication system, UMTS), global interconnection microwave access (worldwide interoperability for microwave access, WiMAX) communication system, future fifth generation (5th Generation, 5G) mobile communication system or new wireless Access technology (new radio access technology, NR) and three application scenarios of 5G mobile communication system enhanced mobile broadband (eMBB), ultra reliable low latency communications (uRLLC), And massive machine type communications (massive machine type communications, mMTC), device-to-device (device-to-device, D2D) communication system, satellite communication system, Internet of things (Internet of things, IoT), narrowband Internet of things (narrow band internet) of things, NB-IoT) system, global system for mobile communications (GSM), enhanced data rate for GSM evolution system (enhanced data rate for GSM evolution, EDGE), wideband code division multiple access system (wideband code division multiple access, WCDMA), code division multiple access 2000 system (code division multiple access, CDMA2000), time division-synchronization code division multiple access system (time division-synchronization code division multiple access, TD-SCDMA). Wherein, the 5G mobile communication system may include non-standalone networking (non-standalone, NSA) and/or standalone networking (standalone, SA).

The communication method provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system and the like. This application is not limited to this.

FIG. 1 is a schematic structural diagram of a communication system applied in an embodiment of the present application. As shown in FIG. 1 , the mobile communication system includes a core network device 110 , a network device 120 and at least one terminal device (such as terminal device 130 and terminal device 140 in FIG. 1 ). The terminal equipment is connected to the network equipment in a wireless manner, and the network equipment is connected to the core network equipment in a wireless or wired manner. Core network equipment and network equipment can be independent and different physical equipment, or the functions of the core network equipment and the logical functions of the network equipment can be integrated on the same physical equipment, or a physical equipment can integrate part of the core network equipment. device functions and functions of some network devices. Terminal equipment can be fixed or mobile. FIG. 1 is only a schematic diagram. The communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG. 1 . The embodiments of the present application do not limit the number of core network devices, network devices and terminal devices included in the mobile communication system.

The network device is the access device that the terminal device accesses the mobile communication system wirelessly, and it can be a base station NodeB, an evolved base station eNodeB, a base station in the NR mobile communication system, a base station in the future mobile communication system, or a WiFi system access nodes, etc., the embodiments of the present application do not limit the specific technology and specific equipment form adopted by the network equipment.

The terminal device may also be called a terminal terminal, user equipment (user equipment, UE), mobile station (mobile station, MS), mobile terminal (mobile terminal, MT) and so on. Terminal equipment can be mobile phone, tablet computer (Pad), computer with wireless transceiver function, virtual reality (virtual reality, VR) terminal equipment, augmented reality (augmented reality, AR) terminal equipment, industrial control (industrial control) ), wireless terminals in self driving, wireless terminals in remote medical surgery, wireless terminals in smart grid, wireless terminals in transportation safety Terminals, wireless terminals in smart cities, wireless terminals in smart homes, etc.

Network equipment and terminal equipment can be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and satellites in the air. The embodiments of the present application do not limit the application scenarios of the network device and the terminal device.

Communication between network devices and terminal devices and between terminal devices can be performed through licensed spectrum, or through unlicensed spectrum, or through both licensed spectrum and unlicensed spectrum communication. Communication between network devices and terminal devices and between terminal devices can be performed through spectrum below 6G, or through spectrum above 6G, and can also use spectrum below 6G and spectrum above 6G for communication at the same time. The embodiments of the present application do not limit the frequency spectrum resources used between the network device and the terminal device.

It should be understood that the present application does not limit the specific forms of the network device and the terminal device.

In the communication system shown in Figure 1, when the network device sends downlink information (such as signaling and/or data) to the terminal device, it is necessary to consider the influence of the downlink channel on the transmitted downlink information, that is, the downlink information is transmitted through the downlink channel information. Weighting to make the downlink information received by the receiving end more accurate. At present, downlink channel detection is often performed by sending a channel state information reference signal (channel state information reference signal, CSI-RS) to a terminal device through a network device. The terminal device receives the CSI-RS sent by the network device, performs quantization measurement according to the protocol codebook, determines the precoding matrix indicator (precoding matrix indicator, PMI), and reports the PMI to the network device, and the network device performs downlink information based on the PMI. weighted. However, the PMI codebook is quantized information, so the downlink channel information reflected by the PMI suffers from loss of accuracy, which in turn leads to poor air interface performance of the downlink channel.

In this embodiment of the present application, in order to solve the problem of inaccurate detection results of the above-mentioned downlink channel detection, a downlink transmission matrix is introduced in the process of downlink channel detection, and the downlink transmission matrix is used to accurately indicate the downlink channel information, and then the network equipment is based on the downlink transmission. The matrix weights the downlink information to optimize the air interface performance of the downlink channel.

It should be understood that the embodiments of the present application are applicable to various communication scenarios, but are especially applicable to a multi-in-multi-out (multi-in-multi-out, MIMO) scenario. In a multiple-in-multi-out (multi-in-multi-out, MIMO) scenario, a network device (such as the network device 120 in Figure 1) and a terminal device (such as the terminal device 130 and/or the terminal device 140 in Figure 1) Two or more antennas are used for information transmission, and an antenna system with multiple channels is formed between the transceivers, and the spectrum utilization is improved by independently sending data on different antennas.

The relevant terms involved in the embodiments of the present application are described below:

1. Channel reciprocity:

When the uplink and downlink are transmitted on different time slots of the same frequency resource, within the coherence time of the channel, it can be considered that the channel fading experienced by the uplink and downlink transmission signals is the same, that is, is the channel reciprocity of the uplink and downlink channels.

2. Channel long-term correlation:

When the channel interval exceeds a preset time length (for example, 20 ms), the correlation degree of channel information is relatively high, that is, the channel is said to have long-term correlation.

In order to facilitate understanding of the embodiments of the present application, the following descriptions are made.

First, in the embodiments shown below, the first, second and various numbers are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. For example, different downlink transmission matrices, uplink channel information, uplink sounding signals, preset values, etc. are distinguished.

Second, the "protocol" involved in the embodiment of the present application may refer to a standard protocol in the communication field, for example, may include the LTE protocol, the NR protocol, and related protocols applied in future communication systems, which is not limited in the present application.

Third, in the embodiments of this application, descriptions such as "when", "in the case of ...", "if" and "if" all refer to the equipment (such as terminal equipment or Network equipment) will make corresponding processing, which is not a time limit, and does not require equipment (such as terminal equipment or network equipment) to make judgments during implementation, nor does it mean that there are other restrictions.

Fourth, "at least one" means one or more, and "multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship.

The lateral transmission method provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

It should be understood that the following is only for the convenience of understanding and description, and the method provided by the embodiment of the present application is described in detail by taking the interaction between the terminal device and the network device as an example. The terminal device may be, for example, a terminal device in the communication system shown in FIG. 1 . For example, the terminal device may be the terminal device 130 or 140 in FIG. 1 . The network device may be, for example, the network device 120 in the communication system shown in FIG. 1 .

However, it should be understood that this should not constitute any limitation on the execution subject of the method provided in this application. As long as the method provided by the embodiment of the present application can be executed by running the program recorded with the code of the method provided in the embodiment of the present application, it can be used as the subject of execution of the method provided in the embodiment of the present application. For example, the terminal device shown in the following embodiments may also be replaced with components in the terminal device, such as a chip, a chip system, or other functional modules capable of invoking programs and executing programs. A network device may also be replaced with components in the network device, such as a chip, a chip system, or other functional modules capable of invoking programs and executing programs.

FIG. 2 is a schematic flowchart of a communication method 200 provided by an embodiment of the present application. As shown in FIG. 2, the method 200 may include S210 and S220. Each step in the method 200 will be described below.

S210, the network device sends a downlink detection signal to the terminal device.

Correspondingly, the terminal device receives the downlink detection signal from the network device.

S220. The terminal device sends a first downlink transmission matrix to the network device, where the first downlink transmission matrix includes n*m elements, and the elements are used to indicate one of the n antennas of the network device and the Downlink channel information between one of the m antennas, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1.

Correspondingly, the network device receives the first downlink transmission matrix sent by the terminal device.

As mentioned above, two or more antennas can be used to transmit information between network devices (such as the network device 120 in Figure 1) and terminal devices (such as the terminal device 130 and/or terminal device 140 in Figure 1). transmission. The downlink transmission matrix in the embodiment of the present application is channel information used to indicate a channel between each antenna of the network device and each antenna of the terminal device. As shown in FIG. 2, the downlink transmission matrix is exemplarily described by taking a 2×2 MIMO system as an example:

FIG. 3 is a schematic diagram of a scene 400 of a MIMO array provided by the present application. The network device 210 performs information exchange with the antennas (A3 and A4) of the terminal device 220 through the antennas (A1 and A2). For example, network device 210 sends signal X1 through antenna A1, and sends signal X2 through antenna A2. Due to the influence of the channel, the signal received by terminal device 220 through antenna A3 is Y1, and the signal received through antenna A4 is Y2. Then the channel information That is, it can be determined by the signals X1 and X2 sent by the sending end and the signals Y1 and Y2 received by the receiving end. For example, the downlink transmission matrix that reflects channel information may be called an H matrix, and the H matrix may satisfy the following formula, for example:

Wherein, h1 to h4 in the H matrix represent channel information of one channel of MIMO transmission respectively. For example, _h1 is the channel information of the channel between the antenna A1 of the network device 210 and the antenna A3 of the terminal device 220, _h2 is the channel information of the channel between the antenna A2 of the network device 210 and the antenna A3 of the terminal device 220, h ₃ is the channel information of the channel between the antenna A1 of the network device 210 and the antenna A4 of the terminal device 220, h ₄ is the channel information of the channel between the antenna A2 of the network device 210 and the antenna A4 of the terminal device 220.

It should be understood that, when the number of antennas of the terminal device and the network device does not change, any downlink transmission matrix in the embodiments of the present application has the same dimension. For example, the dimensions of the first downlink transmission matrix and the second downlink transmission matrix hereinafter are the same.

It should be noted that the network device may send the downlink detection signal to the terminal device periodically or aperiodically. Optionally, the downlink sounding signal may be a CSI-RS.

The terminal device may send the first downlink transmission matrix to the network device each time after receiving the downlink detection signal; or send the first downlink transmission matrix to the network device according to a preset feedback period; or respond to receiving the network device sending The third indication information is to send the first downlink transmission matrix.

It should be understood that the first downlink transmission matrix is a downlink transmission matrix determined based on the last received downlink sounding signal at the current time. For example, the terminal device receives third indication information sent by the network device, and the third indication information instructs the terminal device to send a downlink transmission matrix. In this case, the downlink transmission matrix determined by the terminal device in response to the third indication information is the first Downlink transmission matrix.

In the embodiment of the present application, the terminal device can send the first downlink transmission matrix to the network device. Compared with the PMI codebook, the first downlink transmission matrix can accurately reflect the channel information of the downlink channel, so that the network device can The downlink transmission matrix is precoded to improve the air interface performance of the downlink channel.

When the embodiment of the present application is applied to a fixed wireless access (fixed wireless access, FWA) scenario, within a limited signaling overhead, the network device can accurately obtain downlink channel information through the first downlink transmission matrix, mainly in FWA Oriented to fixed terminals, it only provides limited terminal mobility, such as users walking.

In some embodiments, the network device may perform precoding based on the first downlink transmission matrix.

In some other embodiments, the network device may first evaluate the accuracy of the first downlink transmission matrix before performing precoding. For example, the network device determines whether the first downlink transmission matrix can accurately reflect the information of the current downlink channel by determining the long-term correlation of the channel. The following description will be made in conjunction with FIG. 4 .

FIG. 4 is a schematic flowchart of a communication method 400 provided by an embodiment of the present application. As shown in FIG. 4 , based on the embodiment shown in FIG. 2 , the method 400 may further include at least some of the steps in S230 , S241 and S242 . Each step in the method 400 will be described below.

It should be noted that S210 and S220 in the method 400 have been described in the embodiment shown in FIG. 2 , and will not be repeated here.

For S230, it should be noted that the terminal device may send the uplink detection signal to the network device periodically or aperiodically. When the terminal device sends uplink detection information to the network device aperiodically, it may be the uplink detection information sent in response to the indication information sent by the network device. The uplink sounding information may be, for example, SRS.

It should be noted that the first uplink channel information in S241 and S242 is determined according to the first uplink sounding signal of the receiving terminal device, and the second uplink channel information is determined according to the second uplink sounding signal of the receiving terminal device. The time-domain position interval between the first uplink detection signal and the second detection signal exceeds or is equal to a preset time-domain threshold. It can be understood that the preset time domain threshold may be pre-configured by the network device, defined by a protocol, or preset in the terminal device.

Optionally, the terminal device may send the uplink detection signal to the network device according to the first period, the first period is greater than or equal to the preset time domain threshold, and at this time, the time domain position interval between any two uplink detection signals exceeds Or equal to the preset time domain threshold. Alternatively, the terminal device may send the uplink detection signal to the network device according to a second cycle, the second cycle is less than the preset time domain threshold, and the network device selects a time domain position interval exceeding or equal to the preset time domain from the multiple uplink detection signals sent by the terminal device. A first uplink detection signal and a second uplink detection signal with a time domain threshold set.

Optionally, the time domain position of at least one uplink detection signal among the first uplink detection signal and the second uplink detection signal is after the time domain position of the first downlink transmission matrix.

When the preset time domain threshold is relatively large, the long-term correlation of the channel can be determined by comparing the first uplink channel information with the second uplink channel information. For example, when the correlation degree between the first uplink channel information and the second uplink channel information is greater than the first preset value, the uplink channel has a long-term correlation; the correlation degree between the first uplink channel information and the second uplink channel information is less than the first When the default value is set, the uplink channel has no long-term correlation.

Further, as mentioned above, the uplink channel and the downlink channel generally have channel reciprocity within the coherence time of the channel. Then, when the uplink channel has a long-term correlation, the network device determines that the downlink channel has a long-term correlation. Similarly, when the uplink channel does not have a long-term correlation, the network device determines that the downlink channel does not have a long-term correlation.

Based on the above analysis, in S241, when the degree of correlation between the first uplink channel information and the second uplink channel information is greater than the first preset value, the network device determines that the first downlink transmission matrix sent by the terminal device can still accurately reflect the current Channel information of the downlink channel. In this case, the network device performs precoding based on the first downlink transmission matrix.

In S242, when the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, the network device determines that the first downlink transmission matrix sent by the terminal device cannot accurately reflect the channel information of the current downlink channel. In this case, the network device no longer uses the first downlink transmission matrix for precoding, but needs to reacquire the downlink transmission matrix (same as the second downlink transmission matrix hereinafter).

As an example of S242, the network device determines that the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and then sends the first indication information, and the first indication information instructs the terminal device to send the network device and the second uplink channel information. A second downlink transmission matrix between terminal devices.

Exemplarily, in response to the first indication information, the terminal device determines the second downlink transmission matrix according to the latest downlink detection signal among the downlink detection signals sent periodically by the network device; or the terminal device responds to the first indication information, and determine a second downlink transmission matrix according to the downlink sounding signal carried in the first indication information.

Further, the network device may perform precoding based on the second downlink transmission matrix. Of course, the network device can evaluate the accuracy of the second downlink transmission matrix before performing precoding based on the second downlink transmission matrix, and determine whether the second downlink transmission matrix can accurately reflect the information of the current downlink channel. This process is the same as The foregoing evaluation process for the first downlink transmission matrix is similar and will not be repeated here.

It should be noted that S241 in FIG. 4 is marked by a dotted line, indicating that the network device executes one of the foregoing S241 and S242. That is, if S241 is executed, S242 will not be executed, and if S242 is executed, S241 will not be executed.

The degree of correlation between the first uplink channel information and the second uplink channel information in this embodiment is related to the correlation coefficient ρ between the first uplink channel information and the second uplink channel information.

Exemplarily, the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , and the correlation coefficient ρ between the first uplink channel information and the second uplink channel information satisfies the formula:

That is, the transposition matrix of the first uplink transmission matrix w ₁ is multiplied by the second uplink transmission matrix w ₂ to obtain the correlation coefficient ρ.

In some embodiments, the degree of correlation between the first uplink channel information and the second uplink channel information is inversely proportional to the first difference, and the first difference is the correlation coefficient ρ between the first uplink channel information and the second uplink channel information and A difference of 1. That is, the closer the correlation coefficient ρ between the first uplink channel information and the second uplink channel information is to 1, the higher the degree of correlation between the first uplink channel information and the second uplink channel information.

In some other embodiments, the degree of correlation between the first uplink channel information and the second uplink channel information is proportional to the second difference, and the second difference is the correlation coefficient ρ of the first uplink channel information and the second uplink channel information difference from 0. That is, the closer the correlation coefficient ρ between the first uplink channel information and the second uplink channel information is to 0, the lower the degree of correlation between the first uplink channel information and the second uplink channel information.

In the case that the degree of correlation between the first uplink channel information and the second uplink channel information is related to the correlation coefficient ρ between the first uplink channel information and the second uplink channel information, the first preset value may be greater than 0 and less than 1.

In this embodiment, the network device evaluates the accuracy of the first downlink transmission matrix by determining the degree of correlation between the first uplink channel information and the second uplink channel information by using channel reciprocity, and determines the first downlink transmission matrix Whether it can accurately reflect the information of the current downlink channel, in the case of determining that the first downlink transmission matrix can reflect the information of the current downlink channel, perform precoding based on the first downlink transmission matrix, and determine the first downlink transmission matrix If the current downlink channel information cannot be reflected, the downlink transmission matrix is reacquired. The reliability of downlink information transmission is improved.

FIG. 5 is a schematic flowchart of a communication method 500 provided by an embodiment of the present application. As shown in FIG. 5 , on the basis of the embodiment shown in FIG. 2 , the method 500 may further include at least some of the steps in S250 and S260 . It should be noted that the embodiment shown in FIG. 5 is only described by performing at least some steps in S250 and S260 on the basis of the embodiment shown in FIG. 2 as an example, but at least some of the steps in S250 and S260 shown in FIG. The steps can also be performed on the basis of the embodiment shown in FIG. 4 . Each step in the method 500 will be described below.

It should be noted that S210 and S220 in the method 500 have been described in the embodiment shown in FIG. 2 , and will not be repeated here.

In S250, the terminal device sends reporting information to the network device, so as to report to the network device whether it supports sending a downlink transmission matrix (including at least the first downlink transmission matrix and the second downlink transmission matrix).

In S260, the network device sends second indication information, where the second indication information is used to instruct the terminal device to send the first downlink transmission matrix. Correspondingly, after receiving the second indication information, the terminal device sends the first downlink transmission matrix to the network device.

Optionally, the network device may perform the above S260 after receiving the reporting information sent by the terminal device. In this case, the network device determines that the terminal device has the ability to send the downlink transmission matrix, so as to avoid sending the second indication information to the terminal device that does not have the ability to send the downlink transmission matrix, resulting in failure to receive the first downlink transmission matrix; or, the network device can directly Executing the above S260 means that the network device defaults that the terminal device has the ability to send the downlink transmission matrix. For example, the protocol defines that all terminal devices have the ability to send the downlink transmission matrix.

Above, the method provided by the embodiment of the present application is described in detail with reference to FIG. 2 to FIG. 5 . Hereinafter, the device provided by the embodiment of the present application will be described in detail with reference to FIG. 6 and FIG. 7 .

FIG. 6 is a schematic structural diagram of a communication device 600 provided in an embodiment of the present application. As shown in FIG. 6 , the communication device 600 may include a transceiver unit 610 and a processing unit 620 .

Optionally, the communication apparatus 600 may be applied to the network device in the foregoing method embodiments, for example, may be a network device, or a component configured in the network device (for example, a chip or a chip system, etc.).

It should be understood that the communication apparatus 600 can be applied to the network device in the method 200 in FIG. 2 , the method 400 in FIG. 4 , or the method 500 in FIG. 5 according to the embodiment of the present application, and the communication apparatus 600 may include a Elements of the method executed by the network device in the method 200, the method 400 in FIG. 4 or the method 500 in FIG. 5 . In addition, each unit and the above-mentioned other operations and/or functions in the communication device 600 are respectively intended to implement corresponding processes of the method 200 in FIG. 2 , the method 400 in FIG. 4 , or the method 500 in FIG. 5 .

Wherein, when the communication device 600 is applied to the method in any of the above embodiments, the transceiver unit 610 can be used to send a downlink detection signal to the terminal device; the transceiver unit is also used to receive the first downlink transmission matrix sent by the terminal device, the The first downlink transmission matrix includes n*m elements, which are used to indicate downlink channel information between one of the n antennas of the network device and one of the m antennas of the terminal device, where n is A positive integer greater than or equal to 1, m is a positive integer greater than or equal to 1. Optionally, the processing unit 620 may be configured to determine the first downlink transmission matrix.

In some embodiments, the degree of correlation between the first uplink channel information and the second uplink channel information is greater than a first preset value, and the processing unit 620 is further configured to perform precoding based on the first downlink transmission matrix; wherein, the first Uplink channel information is determined based on receiving a first uplink sounding signal from the terminal device, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, the first uplink sounding signal and the second uplink sounding The time-domain position interval of the signal exceeds a preset time-domain threshold.

In some embodiments, the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and the transceiver unit 610 is further configured to send first indication information to the terminal device, the first indication information indicating The terminal device sends a second downlink transmission matrix between the network device and the terminal device, and the second downlink transmission matrix is used for precoding; wherein, the first uplink channel information is based on receiving the first uplink transmission matrix from the terminal device The sounding signal is determined, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the time domain position interval between the first uplink sounding signal and the second uplink sounding signal exceeds a preset time domain threshold.

In some embodiments, the degree of correlation between the first uplink channel information and the second uplink channel information is inversely proportional to the first difference, or proportional to the second difference; wherein, the first difference is the first uplink The difference between the correlation coefficient ρ of the channel information and the second uplink channel information and 1, and the second difference is the difference between the correlation coefficient ρ of the first uplink channel information and the second uplink channel information and 0.

In some embodiments, the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , and the correlation coefficient ρ between the first uplink channel information and the second uplink channel information Satisfies the formula:

In some embodiments, the downlink sounding signal includes CSIRS.

In some embodiments, the first uplink sounding signal and/or the second uplink sounding signal includes a sounding reference signal SRS.

In some embodiments, the transceiving unit 610 is further configured to: send second indication information to the terminal device, where the second indication information is used to instruct the terminal device to send the first downlink transmission matrix.

In some embodiments, the transceiver unit 610 is specifically configured to: the network device receives report information sent by the terminal device, the report information is used to indicate whether the terminal device supports sending any downlink transmission matrix; when the report information indicates that the When the terminal device supports sending the downlink transmission matrix, send the second indication information to the terminal device.

It should be understood that the specific process for each unit to perform the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.

When the communication device 600 is a network device, the transceiver unit 610 in the communication device 600 can be implemented by a transceiver, for example, it can correspond to the transceiver 720 in the communication device 700 shown in FIG. The processing unit 620 may be implemented by a processor, for example corresponding to the processor 710 in the communication device 700 shown in FIG. 7 .

When the communication device 600 is a chip or system-on-a-chip configured in a network device, both the transceiver unit 610 and the processing unit 620 in the communication device 600 can be implemented through input/output interfaces, circuits, and the like.

Optionally, the communication apparatus 600 may correspond to the terminal device in the above method embodiments, for example, may be a terminal device, or a component configured in the terminal device (such as a chip or a chip system, etc.).

It should be understood that the communication apparatus 600 may correspond to the terminal device in the method 200 in FIG. 2, the method 400 in FIG. 4, or the method 500 in FIG. 2, method 400 in FIG. 4, or method 500 in FIG. 5 is performed by the terminal device. Moreover, each unit in the communication device 600 and the above-mentioned other operations and/or functions are respectively intended to implement corresponding flows of the methods in the method 200 in FIG. 2 , the method 400 in FIG. 4 , or the method 500 in FIG. 5 .

Wherein, when the communication device 600 is used to execute the method in any of the above embodiments, the transceiver unit 610 can be used to receive a downlink detection signal from a network device; the processing unit 620 is used to determine a first downlink transmission matrix; The unit 610 is further configured to send a first downlink transmission matrix to the network device, the first downlink transmission matrix includes n*m elements, and the elements are used to indicate one of the n antennas of the network device and the terminal Downlink channel information between one of the m antennas of the device, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1.

In some embodiments, the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and the transceiver unit is further configured to receive first indication information from the network device, the first indication information indicating The terminal device sends a second downlink transmission matrix between the network device and the terminal device, and the second downlink transmission matrix is used for precoding; wherein, the first uplink channel information is based on receiving the first uplink transmission matrix from the terminal device The sounding signal is determined, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the time domain position interval between the first uplink sounding signal and the second uplink sounding signal exceeds a preset time domain threshold.

In some embodiments, the degree of correlation between the first uplink channel information and the second uplink channel information is inversely proportional to the difference between the correlation coefficient ρ and 1 between the first uplink channel information and the second uplink channel information, or is inversely proportional to the The correlation coefficient ρ between the first uplink channel information and the second uplink channel information is proportional to the difference between 0.

In some embodiments, the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , and the correlation coefficient ρ between the first uplink channel information and the second uplink channel information Satisfies the formula:

In some embodiments, the downlink sounding signal includes a channel state information reference signal CSIRS.

In some embodiments, the first uplink sounding signal and/or the second uplink sounding signal includes SRS.

In some embodiments, the transceiving unit 610 is further configured to receive second indication information from the network device, where the second indication information is used to instruct the terminal device to send the first downlink transmission matrix.

In some embodiments, before the terminal device receives the second indication information from the network device, the transceiving unit 610 is further configured to send report information to the network device, where the report information is used to indicate whether the terminal device supports sending the any Below is the transmission matrix.

It should also be understood that the specific process for each unit to perform the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.

When the communication device 600 is a terminal device, the transceiver unit 610 in the communication device 600 may be implemented by a transceiver, for example, may correspond to the transceiver 720 in the communication device 700 shown in FIG. 7 .

When the communication device 600 is a chip or a system-on-a-chip configured in a terminal device, the transceiver unit 810 in the communication device 600 can be realized by an input/output interface, a circuit, and the like.

FIG. 7 is another schematic block diagram of a communication device 700 provided by an embodiment of the present application. As shown in FIG. 7 , the apparatus 700 may include: a processor 710 , a transceiver 720 and a memory 730 . Wherein, the processor 710, the transceiver 720 and the memory 730 communicate with each other through an internal connection path, the memory 730 is used to store instructions, and the processor 710 is used to execute the instructions stored in the memory 730 to control the transceiver 720 to send signals and /or to receive a signal.

It should be understood that the communication apparatus 700 may correspond to the terminal device or the network device in the above method embodiments, and may be used to execute various steps and/or processes performed by the terminal device or the network device in the above method embodiments. Optionally, the memory 730 may include read-only memory and random-access memory, and provides instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. The memory 730 can be an independent device, or can be integrated in the processor 710 . The processor 710 may be used to execute the instructions stored in the memory 730, and when the processor 710 executes the instructions stored in the memory, the processor 710 is used to execute each of the above-mentioned method embodiments corresponding to the terminal device or the network device. steps and/or processes.

Optionally, the communications apparatus 700 is the terminal device in the foregoing embodiments.

Optionally, the communications apparatus 700 is the network device in the foregoing embodiments.

Wherein, the transceiver 720 may include a transmitter and a receiver. The transceiver 720 may further include antennas, and the number of antennas may be one or more. The processor 710, the memory 730 and the transceiver 720 may be devices integrated on different chips. For example, the processor 710 and the memory 730 may be integrated in a baseband chip, and the transceiver 720 may be integrated in a radio frequency chip. The processor 710, the memory 730 and the transceiver 720 may also be devices integrated on the same chip. This application is not limited to this.

Optionally, the communication apparatus 700 is a component configured in a terminal device, such as a chip, a chip system, and the like.

Optionally, the communication apparatus 700 is a component configured in a network device, such as a chip, a chip system, and the like.

Wherein, the transceiver 720 may also be a communication interface, such as an input/output interface, a circuit, and the like. The transceiver 720 , the processor 710 and the memory 720 may be integrated into the same chip, such as a baseband chip.

The present application also provides a processing device, including at least one processor, and the at least one processor is used to execute the computer program stored in the memory, so that the processing device executes the method or network performed by the terminal device in the above method embodiment The method implemented by the device.

The embodiment of the present application also provides a processing device, including a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the processing device executes the method executed by the terminal device or the method executed by the network device in the above method embodiments.

It should be understood that the above processing device may be one or more chips. For example, the processing device may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated circuit (ASIC), or a system chip (system on chip, SoC). It can be a central processor unit (CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (micro controller unit) , MCU), can also be a programmable controller (programmable logic device, PLD) or other integrated chips.

In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software. The steps of the methods disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware. To avoid repetition, no detailed description is given here.

It can be understood that the memory in the embodiments of the present application may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. Among them, the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erases programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory can be random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, many forms of RAM are available such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM ) and direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

According to the method provided in the embodiment of the present application, the present application also provides a computer program product, the computer program product including: computer program code, when the computer program code is run on the computer, the computer is made to execute the method in the above method embodiment A method performed by a terminal device or a network device.

According to the methods provided in the embodiments of the present application, the present application also provides a computer-readable storage medium, the computer-readable storage medium stores program codes, and when the program codes are run on a computer, the computer is made to execute the above-mentioned method embodiments A method performed by a terminal device or a network device in a network.

According to the method provided in the embodiment of the present application, the present application further provides a communication system, where the communication system may include the aforementioned terminal device and network device.

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

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disc and other media that can store program codes. .

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (38)

1. A communication method, characterized in that, comprising:

   The network device sends a downlink detection signal to the terminal device;

   The network device receives the first downlink transmission matrix sent by the terminal device, the first downlink transmission matrix includes n*m elements, and the elements are used to indicate one of the n antennas of the network device Downlink channel information between the antenna and one of the m antennas of the terminal device, where n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1.
2. The method according to claim 1, further comprising:

   The degree of correlation between the first uplink channel information and the second uplink channel information is greater than a first preset value, and the network device performs precoding based on the first downlink transmission matrix; wherein,

   The first uplink channel information is determined based on receiving a first uplink sounding signal from the terminal device, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the first uplink sounding The time-domain position interval between the signal and the second uplink detection signal exceeds a preset time-domain threshold.
3. The method according to claim 1 or 2, wherein the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and the method further comprises:

   The network device sends first indication information to the terminal device, where the first indication information instructs the terminal device to send a second downlink transmission matrix between the network device and the terminal device, the second downlink The transmission matrix is used for precoding; where,

   The first uplink channel information is determined based on receiving a first uplink sounding signal from the terminal device, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the first uplink sounding The time-domain position interval between the signal and the second uplink detection signal exceeds a preset time-domain threshold.
4. The method according to claim 3, wherein the degree of correlation between the first uplink channel information and the second uplink channel information is inversely proportional to the first difference, or proportional to the second difference; wherein, the The first difference is the difference between the correlation coefficient ρ and 1 between the first uplink channel information and the second uplink channel information, and the second difference is the first uplink channel information and the second uplink channel information The difference between the correlation coefficient ρ of channel information and 0.
5. The method according to claim 4, wherein the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , and the first uplink channel information The correlation coefficient ρ with the second uplink channel information satisfies the formula:

   
6. The method according to any one of claims 1 to 5, wherein the downlink sounding signal includes a Channel State Information Reference Signal (CSIRS).
7. The method according to any one of claims 2 to 5, wherein the first uplink sounding signal and/or the second uplink sounding signal includes a Sounding Reference Signal (SRS).
8. The method according to any one of claims 1 to 7, further comprising:

   The network device sends second indication information to the terminal device, where the second indication information is used to instruct the terminal device to send the first downlink transmission matrix.
9. The method according to claim 8, wherein the network device sends the second indication information to the terminal device, comprising:

   The network device receives the reporting information sent by the terminal device, where the reporting information is used to indicate whether the terminal device supports sending any of the downlink transmission matrices;

   The network device sends the second indication information to the terminal device when the reported information indicates that the terminal device supports sending the downlink transmission matrix.
10. A communication method, characterized in that, comprising:

    The terminal device receives the downlink detection signal from the network device;

    The terminal device sends a first downlink transmission matrix to the network device, the first downlink transmission matrix includes n*m elements, and the elements are used to indicate one of the n antennas of the network device and downlink channel information between one of the m antennas of the terminal device, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1.
11. The method according to claim 10, wherein the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and the method further comprises:

    The terminal device receives first indication information from the network device, where the first indication information instructs the terminal device to send a second downlink transmission matrix between the network device and the terminal device, and the second The downlink transmission matrix is used for precoding; where,

    The first uplink channel information is determined based on receiving a first uplink sounding signal from the terminal device, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the first uplink sounding The time-domain position interval between the signal and the second uplink detection signal exceeds a preset time-domain threshold.
12. The method according to claim 11, characterized in that the degree of correlation between the first uplink channel information and the second uplink channel information and the correlation coefficient ρ between the first uplink channel information and the second uplink channel information are The difference of 1 is inversely proportional to, or proportional to the difference between the correlation coefficient ρ of the first uplink channel information and the second uplink channel information and 0.
13. The method according to claim 12, wherein the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , and the first uplink channel information The correlation coefficient ρ with the second uplink channel information satisfies the formula:

    
14. The method according to any one of claims 10 to 13, wherein the downlink sounding signal includes a Channel State Information Reference Signal (CSIRS).
15. The method according to any one of claims 11 to 13, wherein the first uplink sounding signal and/or the second uplink sounding signal includes a Sounding Reference Signal (SRS).
16. The method according to any one of claims 10 to 15, further comprising:

    The terminal device receives second indication information from the network device, where the second indication information is used to instruct the terminal device to send a first downlink transmission matrix.
17. The method according to claim 16, further comprising: before the terminal device receives the second indication information from the network device:

    The terminal device sends report information to the network device, where the report information is used to indicate whether the terminal device supports sending any of the downlink transmission matrices.
18. A communication device, characterized by comprising:

    a transceiver unit, configured to send a downlink detection signal to the terminal device;

    The transceiver unit is further configured to receive a first downlink transmission matrix sent by the terminal device, the first downlink transmission matrix includes n*m elements, and the elements are used to indicate n antennas of the communication device Downlink channel information between one of the antennas and one of the m antennas of the terminal device, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1;

    A processing unit, configured to determine the first downlink transmission matrix.
19. The device according to claim 18, wherein the degree of correlation between the first uplink channel information and the second uplink channel information is greater than a first preset value, and the processing unit is further configured to: based on the first downlink transmission matrix is pre-coded; among them,

    The first uplink channel information is determined based on receiving a first uplink sounding signal from the terminal device, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the first uplink sounding The time-domain position interval between the signal and the second uplink detection signal exceeds a preset time-domain threshold.
20. The device according to claim 18 or 19, wherein the degree of correlation between the first uplink channel information and the second uplink channel information is smaller than a first preset value, and the transceiver unit is further configured to send the second uplink channel information to the terminal equipment. Instruction information, the first instruction information instructs the terminal equipment to send a second downlink transmission matrix between the communication device and the terminal equipment, and the second downlink transmission matrix is used for precoding; wherein,

    The first uplink channel information is determined based on receiving a first uplink sounding signal from the terminal device, the second uplink channel information is determined based on receiving a second uplink sounding signal from the terminal device, and the first uplink sounding The time-domain position interval between the signal and the second uplink detection signal exceeds a preset time-domain threshold.
21. The device according to claim 20, wherein the degree of correlation between the first uplink channel information and the second uplink channel information is inversely proportional to the first difference, or proportional to the second difference; wherein, the The first difference is the difference between the correlation coefficient ρ and 1 between the first uplink channel information and the second uplink channel information, and the second difference is the first uplink channel information and the second uplink channel information The difference between the correlation coefficient ρ of channel information and 0.
22. The device according to claim 21, wherein the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , and the first uplink channel information The correlation coefficient ρ with the second uplink channel information satisfies the formula:

    
23. The device according to any one of claims 18 to 22, wherein the downlink sounding signal includes a Channel State Information Reference Signal (CSIRS).
24. The device according to any one of claims 19 to 22, wherein the first uplink sounding signal and/or the second uplink sounding signal includes a Sounding Reference Signal (SRS).
25. The device according to any one of claims 18 to 24, wherein the transceiver unit is further configured to send second indication information to the terminal equipment, and the second indication information is used to instruct the terminal equipment to send The first downlink transmission matrix.
26. The device according to claim 25, wherein the transceiver unit is specifically used for:

    Receive reporting information sent by the terminal device, where the reporting information is used to indicate whether the terminal device supports sending any of the downlink transmission matrices;

    When the reported information indicates that the terminal device supports sending the downlink transmission matrix, sending the second indication information to the terminal device.
27. A communication device, characterized by comprising:

    a transceiver unit, configured to receive a downlink detection signal from a network device;

    A processing unit, configured to determine a first downlink transmission matrix, where the first downlink transmission matrix includes n*m elements, and the elements are used to indicate one of the n antennas of the network device and the communication Downlink channel information between one of the m antennas of the device, n is a positive integer greater than or equal to 1, and m is a positive integer greater than or equal to 1

    The transceiver unit is further configured to send a first downlink transmission matrix to the network device.
28. The device according to claim 27, wherein the degree of correlation between the first uplink channel information and the second uplink channel information is less than a first preset value, and the transceiving unit is further configured to receive the first uplink channel information from the network device indication information, the first indication information indicates to send a second downlink transmission matrix between the network device and the communication device, and the second downlink transmission matrix is used for precoding; wherein,

    The first uplink channel information is determined based on receiving a first uplink sounding signal from the communication device, the second uplink channel information is determined based on receiving a second uplink sounding signal from the communication device, and the first uplink sounding The time-domain position interval between the signal and the second uplink detection signal exceeds a preset time-domain threshold.
29. The device according to claim 28, wherein the degree of correlation between the first uplink channel information and the second uplink channel information and the correlation coefficient ρ between the first uplink channel information and the second uplink channel information are The difference of 1 is inversely proportional to, or proportional to the difference between the correlation coefficient ρ of the first uplink channel information and the second uplink channel information and 0.
30. The device according to claim 29, wherein the first uplink information includes a first uplink transmission matrix w ₁ , the second uplink information includes a second uplink transmission matrix w ₂ , and the first uplink channel information The correlation coefficient ρ with the second uplink channel information satisfies the formula:

    
31. The device according to any one of claims 27 to 30, wherein the downlink sounding signal includes a Channel State Information Reference Signal (CSIRS).
32. The device according to any one of claims 28 to 30, wherein the first uplink sounding signal and/or the second uplink sounding signal includes a Sounding Reference Signal (SRS).
33. The device according to any one of claims 27 to 32, wherein the transceiver unit is further configured to receive second indication information from the network device, the second indication information is used to indicate that the communication device Send the first downlink transmission matrix.
34. The device according to claim 33, wherein the transceiver unit is further configured to send reporting information to the network device, the reporting information is used to indicate whether the communication device supports sending any of the downlink transmission matrices .
35. A communication device, characterized by a processor and a memory, the memory is used to store a computer program, the processor is used to call and run the computer program stored in the memory, and perform any one of claims 1 to 17 the method described.
36. A chip, characterized by comprising: a processor, configured to call and execute computer instructions from a memory, so that a device equipped with the chip executes the method according to any one of claims 1 to 17.
37. A computer-readable storage medium, characterized by being used for storing computer program instructions, the computer program causing a computer to execute the method according to any one of claims 1 to 17.
38. A computer program product, characterized by comprising computer program instructions, the computer program instructions cause a computer to execute the method according to any one of claims 1 to 17.

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