WO2023125833A1

WO2023125833A1 - Communication method and communication apparatus

Info

Publication number: WO2023125833A1
Application number: PCT/CN2022/143496
Authority: WO
Inventors: 蔡世杰; 张哲宁; 秦熠; 刘鹍鹏
Original assignee: 华为技术有限公司
Priority date: 2021-12-31
Filing date: 2022-12-29
Publication date: 2023-07-06
Also published as: CN116437391A

Abstract

The present application provides a communication method and a communication apparatus. The communication method comprises: an access network device receiving a first indication message from a terminal device, the first indication message being used for indicating a first vector, wherein an element in the first vector is associated with a terminal device port receiving a downlink reference signal, and the first vector is used for indicating an amplitude ratio or an energy ratio of the downlink reference signal received by the associated port. By means of the communication method, the access network device can obtain auxiliary information reflecting downlink channel information when the terminal device receives downlink data, and thus sending the downlink data according to the auxiliary information can improve downlink throughput.

Description

A communication method and communication device

This application claims the priority of the Chinese patent application with application number 202111677004.X and application title "A communication method and communication device" filed with the State Intellectual Property Office of China on December 31, 2021, the entire contents of which are incorporated by reference incorporated in this application.

technical field

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

Background technique

In time division duplexing (time division duplexing, TDD) systems, there is usually ideal mutuality between the ideal uplink channel and the ideal downlink channel, which can be understood as the parameter values (such as amplitude and phase) of the ideal uplink channel equal to the parameters of the ideal downlink channel values (such as magnitude and phase). Therefore, after the base station estimates the ideal uplink channel, based on the rational difference between the ideal uplink and downlink channels, it is equivalent to obtaining an ideal downlink channel.

However, in an actual system, the channel is jointly determined by the terminal device side hardware, the wireless path between the terminal device and the access network device, and the access network device side hardware. Due to the irregular arrangement of the antennas of the terminal equipment, the radio frequency paths of different transmitting antennas and receiving antennas are different, so that in the time division duplexing (time division duplexing, TDD) system, the actual uplink channel is affected by uplink non-ideal factors, and the actual downlink channel is affected by Due to the influence of downlink non-ideal factors, the actual uplink channel (ideal uplink channel affected by uplink non-ideal factors) and the actual downlink channel (ideal downlink channel affected by downlink non-ideal factors) no longer have ideal mutuality. In this way, the access network equipment cannot perform accurate downlink precoding according to the ideal reciprocity of the uplink and downlink channels, which leads to a decrease in downlink throughput. How to solve the downlink throughput drop caused by non-ideal mutuality is an urgent problem to be solved.

Contents of the invention

The embodiment of the present application provides a communication method and a communication device. Through such a communication method, the access network device obtains auxiliary information reflecting downlink channel information (that is, the first vector mentioned later), and according to the auxiliary information Accurate downlink precoding is used to send downlink data, thereby improving downlink throughput.

In a first aspect, an embodiment of the present application provides a communication method, in which the access network device receives a first indication message from a terminal device, where the first indication message is used to indicate a first vector, where the first The elements in the vector are associated with the port on which the terminal device receives the downlink reference signal, and the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the associated port.

Based on the method described in the first aspect, the access network device can obtain accurate downlink channel related information, creating conditions for it to improve downlink throughput.

In a possible implementation manner, elements in the first vector correspond to ports through which the terminal device receives the downlink reference signal; the first vector is used to indicate amplitude ratios or energy ratios of the downlink reference signals received by each port.

In a possible implementation manner, the access network device configures at least one sounding reference signal SRS resource set for the terminal device, and the at least one SRS resource set is used for antenna selection. Wherein, at least one SRS resource set includes q SRS resources, each SRS resource includes m SRS ports, at least one SRS resource set includes n SRS ports in total, n is a positive integer greater than or equal to 1, and m is greater than or equal to 1 and less than A positive integer equal to n, q is a positive integer greater than or equal to 1; the first indication message includes first information, the first information is used to indicate the first vector, the number of elements of the first vector is n elements, n-1 elements, m elements, or m-1 elements.

By implementing this possible implementation method, the amount of data reported by the terminal device to the access network device can be saved, thereby saving communication transmission resources.

In a possible implementation manner, the access network device receives the SRS from the terminal device. Wherein, the SRS port through which the terminal device sends the SRS corresponds to the port through which the terminal device receives the downlink reference signal; the access network device sends downlink data to the terminal device based on the SRS and the first vector.

By implementing this possible implementation mode, the access network device can perform accurate downlink precoding in combination with auxiliary information (amplitude ratio or energy ratio of downlink reference signals received by each port of the terminal device), thereby improving downlink throughput.

In a possible implementation manner, the access network device obtains downlink channel information based on the SRS and the first vector; wherein the downlink channel information includes downlink channel information corresponding to multiple ports, and the amplitude of the downlink channel information corresponding to the multiple ports is The ratio or energy ratio is associated with the amplitude ratio or energy ratio indicated by the first vector; the access network device precodes the downlink data based on the downlink channel information; the access network device sends the downlink data to the terminal device.

By implementing this possible implementation mode, the access network device can combine auxiliary information (amplitude ratio or energy ratio of the downlink reference signal received by each port of the terminal device) to obtain more accurate downlink channel information, and perform downlink based on the accurate downlink channel information. Precoding can improve downlink throughput.

In a possible implementation, the first vector is [β ₀ ... β _i ... β _n-1 ], β _i corresponds to the i-th port, i=0, 1, ..., n -1;

The downlink channel information H ^DL satisfies the following formula:

in,

is the uplink channel information corresponding to the i-th SRS port; when the first vector is used to indicate the energy ratio of the downlink reference signal received by each port, _λi is

When the first vector is used to indicate the amplitude ratio of downlink reference signals received by each port, λ _i is β _i .

In a possible implementation manner, the first vector is [β _km ... β _km+j ... β _(k+1)m-1 ... β _km ... β _km+j ... β _(k+1)m-1 ], β _km+j corresponds to the km+jth port, j=0,1,...,m-1, k=0,1,...,q- 1;

The downlink channel information H ^DL satisfies the following formula:

in,

is the uplink channel information corresponding to the jth SRS port; when the first vector is used to indicate the energy ratio of the downlink reference signal received by each port, λ _j is

When the first vector is used to indicate the amplitude ratio of downlink reference signals received by each port, λ _j is β _km+j .

In a possible implementation manner, the access network device receives a second indication message from the terminal device, where the second indication message is used to indicate a second vector, and elements in the second vector are related to SRS resources used for antenna selection The second vector is used to indicate the power ratio or amplitude ratio of the SRS sent on the associated SRS resource; the access network device sends downlink data to the terminal device based on the SRS, the first vector and the second vector.

By implementing this possible implementation mode, when the terminal device sends the SRS for antenna selection and the power of the SRS is different each time, the access network device can combine the auxiliary information (the amplitude ratio or energy of the downlink reference signal received by each port of the terminal device Ratio) and the power of sending SRS each time to perform accurate downlink precoding, so as to improve the downlink throughput.

In a possible implementation, the elements in the second vector correspond to the SRS resources used for antenna selection one by one; the second vector is used to indicate the power ratio or amplitude of the SRS sent on each SRS resource used for antenna selection ratio.

In a possible implementation manner, the access network device obtains downlink channel information based on the SRS, the first vector, and the second vector; wherein the downlink channel information includes downlink channel information corresponding to multiple ports, and the downlink channel information corresponding to the multiple ports The amplitude ratio or energy ratio of the channel information is not only associated with the amplitude ratio or energy ratio indicated by the first vector, but also associated with the power ratio or amplitude ratio indicated by the second vector; based on the downlink channel information, the access network device The data is precoded, and then the access network device sends downlink data to the terminal device.

By implementing this possible implementation mode, when the terminal device sends the SRS for antenna selection and the power of the SRS is different each time, the access network device can combine the auxiliary information (the amplitude ratio or energy of the downlink reference signal received by each port of the terminal device ratio) and the power of sending SRS each time to obtain more accurate downlink channel information, and performing downlink precoding according to the accurate downlink channel information can improve downlink throughput.

In a possible implementation manner, the second vector is [α ₀ ... α _l ... α _q-1 ], where α _l is related to the antenna selection sent by the terminal device on the lth SRS resource Corresponding to the power or amplitude of the SRS, l=0,1,...,q-1;

The downlink channel information H ^DL satisfies the following formula:

in,

Be the uplink channel information corresponding to the jth SRS port; when the second vector is used to indicate the power ratio of the SRS sent by the terminal equipment on each SRS resource used for antenna selection, η _l is α _l ; in the second vector When used to indicate the amplitude ratio of the SRS sent by the terminal equipment on each SRS resource used for antenna selection, η _l is

In the second aspect, the embodiment of the present application provides a communication method. In this method, the terminal device sends a first indication message to the access network device. The first indication message indicates a first vector, and the elements in the first vector are consistent with the terminal The port of the device receiving the downlink reference signal is associated; the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the associated port.

For the beneficial effects of the communication method based on the second aspect, reference may be made to the beneficial effects of the communication method provided in the first aspect above, and details are not repeated here.

In a possible implementation manner, the elements in the first vector correspond one-to-one to the ports through which the terminal device receives the downlink reference signal; the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by each port.

In a possible implementation method, the terminal device receives at least one sounding reference signal SRS resource set from the access network device, at least one SRS resource set is used for antenna selection, at least one SRS resource set includes q SRS resources, and each SRS The resources include m SRS ports, at least one SRS resource set includes n SRS ports in total, n is a positive integer greater than or equal to 1, m is a positive integer greater than or equal to 1 and less than or equal to n, and q is a positive integer greater than or equal to 1; An indication message includes first information, where the first information is used to indicate a first vector, and the number of elements of the first vector is any one of n, n-1, m, or m-1.

In a possible implementation method, the terminal device sends an SRS to the access network device, and the SRS port through which the terminal device sends the SRS corresponds to the port through which the terminal device receives the downlink reference signal; the terminal device receives downlink data from the access network device.

In a possible implementation method, the terminal device sends a second indication message to the access network device, where the second indication message is used to indicate a second vector, and elements in the second vector are associated with SRS resources used for antenna selection; The second vector is used to indicate the power ratio or amplitude ratio of the SRS sent on the associated SRS resource; the terminal device receives downlink data from the access network device.

In a third aspect, the present application provides a communication device, which may be a device in an access network device, or a device that can be matched and used with the access network device. Wherein, the communication device may also be a system on a chip. The communication device can execute the method described in the first aspect. The functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the above functions. This unit can be software and/or hardware. For the operations and beneficial effects performed by the communication device, reference may be made to the method and beneficial effects described in the first aspect above, and repeated descriptions will not be repeated.

In a fourth aspect, the present application provides a communication device, which may be a device in a terminal device, or a device that can be matched with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device can execute the method described in the second aspect. The functions of the communication device may be realized by hardware, or may be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the above functions. This unit can be software and/or hardware. For operations and beneficial effects performed by the communication device, reference may be made to the method and beneficial effects described in the second aspect above, and repeated descriptions will not be repeated.

In a fifth aspect, the present application provides a communication device. The communication device may be the access network device in the above method embodiment, or a chip provided in the access network device. The communication device includes a communication interface, a processor, and optionally, a memory. Wherein, the memory is used to store computer programs or instructions, and the processor is coupled to the memory and the communication interface. When the processor executes the computer programs or instructions, the communication device is made to execute the method performed by the access network device in the above method embodiment. method.

In a sixth aspect, the present application provides a communication device, and the communication device may be the terminal device in the foregoing method embodiment, or a chip provided in the terminal device. The communication device includes a communication interface, a processor, and optionally, a memory. Wherein, the memory is used to store computer programs or instructions, and the processor is coupled to the memory and the communication interface. When the processor executes the computer programs or instructions, the communication device executes the method performed by the terminal device in the above method embodiments.

In the seventh aspect, the present application provides a computer-readable storage medium, the computer-readable storage medium is used to store computer-executable instructions, and when the computer-executable instructions are executed, the method described in the first aspect accesses The method executed by the network device is realized; or, the method executed by the terminal device in the method described in the second aspect is realized.

In an eighth aspect, the present application provides a computer program product including a computer program. When the computer program is executed, the method performed by the access network device in the method described in the first aspect is realized; or, the method described in the first aspect is implemented; In the method described in the second aspect, the method performed by the terminal device is implemented.

In a ninth aspect, the present application provides a communication system, which includes the communication device described in the third aspect and the fourth aspect above; or includes the communication device described in the fifth aspect and the sixth aspect above.

Description of drawings

FIG. 1 is a schematic diagram of a system architecture provided by the present application;

FIG. 2a is a schematic diagram of an antenna selection scenario provided by the present application;

FIG. 2b is a schematic diagram of a non-antenna selection scenario provided by the present application;

FIG. 3 is a schematic flowchart of a communication method provided by the present application;

FIG. 4 is a schematic flowchart of another communication method provided by the present application;

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

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

FIG. 7 is a schematic structural diagram of another communication device provided by the present application.

Detailed ways

The specific embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings.

The terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish different objects, rather than to describe a specific order. Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In this application, "at least one (item)" means one or more, "multiple" means two or more, "at least two (items)" means two or three and three Above, "and/or" is used to describe the association relationship of associated objects, which means that there can be three kinds of relationships, for example, "A and/or B" can mean: only A exists, only B exists, and A and B exist at the same time A case where A and B can be singular or plural. The character "/" generally indicates that the contextual objects are an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one item (piece) of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c ", where a, b, c can be single or multiple.

In order to better understand the embodiment of the present application, the following first introduces the system architecture involved in the embodiment of the present application:

The technical solution of the embodiment of the present application can be applied to various communication systems, for example: global system of mobile communication (global system of mobile communication, GSM) system, code division multiple access (code division multiple access, CDMA) system, broadband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) Communication System, 5th Generation (5G) system or new radio (new radio, NR) and future communication systems, etc.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram of a system architecture provided by an embodiment of the present application. In the system architecture shown in FIG. 1 , a terminal device 101 and an access network device 102 are included. The terminal device 101 and the access network device 102 involved in the system architecture in FIG. 1 will be described in detail below.

Terminal device 101 is an entity on the user side for receiving or transmitting signals, including devices that provide voice and/or data connectivity to users. For example, terminal device 101 is a device with wireless transceiver functions that can be deployed in On land, including indoor or outdoor, handheld, wearable or vehicle-mounted; can also be deployed on water (such as ships, etc.); can also be deployed in the air (such as aircraft, balloons and satellites, etc.). The terminal device 101 can be a mobile phone, a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, or a wireless device in industrial control (industrial control). Terminals, vehicle terminal equipment, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety , wireless terminals in smart cities, wireless terminals in smart homes, wearable terminal devices, etc. The embodiments of the present application do not limit the application scenarios. Terminal equipment may sometimes be called terminal, user equipment (UE), access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, UE terminal equipment, terminal equipment, wireless communication equipment, UE proxy or UE device, etc. Terminals can also be fixed or mobile.

An access network device (radio access network, RAN) 102 is a node or device that connects a terminal device to a wireless network. The RAN 102 has a communication connection with the terminal device 101, which can be understood as communication between the RAN 102 and the terminal device 101. Data transmission is performed through the Uu interface (or air interface). Of course, in future communications, the names of these interfaces may remain unchanged, or may be replaced by other names, which is not limited in this application. RAN can be any kind of equipment with wireless transceiver function, including but not limited to: evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in LTE, base station in NR (gNodeB or gNB) or transmission receiver Transmission ReceptionPoint (TRP), the base station of 3GPP subsequent evolution, the access node in the WiFi system, the wireless relay node, the wireless backhaul node, etc. The base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc. Multiple base stations may support the aforementioned networks of the same technology, or may support the aforementioned networks of different technologies. A base station may contain one or more co-sited or non-co-sited TRPs. The RAN can also be a wireless controller, a centralized unit (Central Unit, CU), and/or a distributed unit (Distributed Unit, DU) in a cloud radio access network (Cloud Radio Access Network, CRAN) scenario. RAN can also be servers, wearable devices, or vehicle-mounted devices. In the following, the RAN is taken as an example for description. The multiple RANs may be base stations of the same type, or base stations of different types. The base station can communicate with the terminal equipment, and can also communicate with the terminal equipment through the relay station. The terminal device can communicate with multiple base stations of different technologies. For example, the terminal device can communicate with the base station supporting the LTE network, and also can communicate with the base station supporting the 5G network. It can also support the communication between the base station of the LTE network and the base station of the 5G network. double connection.

In order to better understand the solutions provided by this application, the relevant terms involved in the embodiments of this application are introduced below:

1. Reference signal (reference signal, RS)

The RS is a known signal provided by a transmitting end (such as a terminal device) to a receiving end (such as an access network device) for channel estimation or channel detection. In a communication system, reference signals can be divided into uplink reference signals and downlink reference signals. For example, the sounding reference signal (sounding reference signal, SRS) is an uplink reference signal sent by the terminal device to the access network device; the channel state information-reference signal (CSI-RS) is sent by the access network device A downlink reference signal sent by a network access device to a terminal device.

2. Uplink channel estimation

In the communication system, the access network device may configure multiple SRS resource sets for the terminal device, where each SRS resource set may include multiple SRS resources, and each SRS resource may include multiple SRS ports. The terminal device uses the SRS port to send the SRS on the time-frequency resource configured by the access network device. Further, the access network device receives the SRS at the corresponding time-frequency resource, and estimates and sends the SRS port used by the SRS according to the SRS Corresponding uplink channel information.

3. Antenna selection scenarios and non-antenna selection scenarios

Antenna selection scenario: the access network device configures at least one SRS resource set for the terminal device for antenna selection. Wherein, at least one SRS resource set includes q SRS resources, each SRS resource is used to transmit the SRS selected by the antenna, each SRS resource includes m SRS ports, and the at least one SRS resource set includes n SRS ports in total, where n is A positive integer greater than or equal to 1, m is a positive integer greater than or equal to 1 and less than or equal to n, and q is a positive integer greater than 1. For example, as shown in Figure 2a, the access network device configures an SRS resource set for the terminal device, the SRS resource set includes 2 SRS resources, each SRS resource includes 2 SRS ports, and the SRS resource set includes 4 SRS ports.

The non-antenna selection scenario can be understood as a special existence in the antenna selection scenario, that is, the antenna selection scenario where m is equal to n and q is 1. For example, as shown in Figure 2b, the access network device configures an SRS resource set for the terminal device, the SRS resource set includes 1 SRS resource, the SRS resource includes 4 SRS ports, and the SRS resource set includes 4 SRS port.

4. Uniform quantization and non-uniform quantization area

Uniform quantization refers to quantization that divides the range of values of elements to be quantized into equal intervals. Non-uniform quantization refers to the quantization in which the range of the elements to be quantized is not divided into equal intervals. Exemplarily, the value range of the element to be quantized is (0, 1], please refer to Table 1 and Table 2, wherein, Table 1 provides a way to uniformly quantize the element A to be quantized, and Table 2 provides a The method of performing non-uniform quantization on element A, where the value of n is related to the number of quantization bits B, satisfies

When n=16, the actual value of element A to be quantized is

, according to Table 1, the element A to be quantized is quantized as

According to Table 2, after quantizing the element A to be quantized, it is

Table 1

Table 2

5. Ideal reciprocity of uplink and downlink channels

The TDD system uses the same frequency and different time slots for uplink and downlink signal transmission. In an ideal environment, regardless of the interference between the uplink and downlink, since the uplink and downlink transmit on the same frequency in the TDD system, it can be considered that the fading of the uplink channel and the downlink channel are basically the same. In other words, the ideal reciprocity of uplink and downlink channels means that the uplink channel information in an ideal environment (hereinafter also referred to as ideal uplink channel information) is the same as the downlink channel information in an ideal environment (hereinafter also referred to as ideal downlink channel information) . It can be seen that the ideal reciprocity of the uplink and downlink channels can be used to assist the access network equipment to estimate the ideal downlink channel, that is, after the access network equipment obtains the rational uplink channel information according to the SRS, the access network equipment also obtains the ideal downlink channel information.

However, in an actual system, the channel is jointly determined by the hardware on the terminal device side, the hardware on the access network device side, and the wireless path between the terminal device and the access network device, and it cannot be regarded as an ideal environment. There is no ideal mutuality between the actual uplink channel (ideal uplink channel affected by uplink non-ideal factors) and actual downlink channel (ideal downlink channel affected by downlink non-ideal factors) in the system. If the access network device obtains the actual uplink channel information (ideal uplink channel information affected by uplink non-ideal factors, hereinafter referred to as uplink channel information) according to the SRS channel from the terminal device, the actual uplink channel information is equal to the actual downlink channel information. Channel information (ideal downlink channel information affected by downlink non-ideal factors, hereinafter referred to as downlink channel information) is inaccurate.

In the communication method provided by this application, the access network device of this application assists in sending downlink data by acquiring auxiliary information (auxiliary information that can reflect downlink channel information, that is, the first vector in this application), which improves the Downlink throughput. The communication method and communication device provided by this application are further introduced below in conjunction with the accompanying drawings:

Please refer to FIG. 3 . FIG. 3 is a schematic flowchart of a communication method provided by an embodiment of the present application. As shown in FIG. 3 , the execution subject of the communication method may be an access network device or a chip in the access network device, or the execution subject may be a terminal device or a chip in the terminal device. FIG. 3 uses an access network device and a terminal device as an example for illustration. in:

S301. The access network device receives a first indication message from a terminal device, where the first indication message is used to indicate a first vector.

The access network device sends a downlink reference signal (such as a CSI-RS) to the terminal device. Further, the terminal device sends the first indication message indicating the first vector to the access network device according to the amplitude or energy of the downlink reference signal received by each port. Wherein, the elements in the first vector are associated with the port on which the terminal device receives the downlink reference signal, and the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the associated port.

In a possible implementation manner, elements in the first vector correspond to ports through which the terminal device receives the downlink reference signal, and the first vector is used to indicate an amplitude ratio or an energy ratio of the downlink reference signals received by each port.

It should be understood that the port mentioned in this application can be replaced by any one of UE port, UE antenna port, UE physical antenna port, UE virtual antenna port, receiving port or UE receiving port, mainly used for terminal equipment Receive a downlink reference signal. The energy mentioned in this application can be understood as power. The first indication message may be radio resource control (radio resource control, RRC) signaling, media access control (media access control, MAC) control element (control element, CE) signaling or uplink control information (uplink control information, UCI) ) signaling. The elements in the first vector have a one-to-one correspondence with the ports on which the terminal device receives the downlink reference signal. It can be understood that the number of elements in the first vector is the same as the number of ports on which the terminal device receives the downlink reference signal, and each in the first vector The elements are used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the port corresponding to the element for receiving the downlink reference signal. It should be understood that, in an embodiment, the vectors described in each embodiment of the present invention may also be an array or a set, and the terminal or access network device determines the value corresponding to each value in the array according to preset rules or specific rules. port.

For ease of understanding, the first scenario is taken as an example below to explain how the first indication message indicates the first vector and the first vector. In the first scenario, the terminal device includes n ports, where n is a positive integer greater than or equal to 1; the access network device configures at least one SRS resource set for the terminal device, and the at least one SRS resource set is used for antenna selection. Wherein, the at least one SRS resource set includes q SRS resources, each SRS resource includes m SRS ports, and the at least one SRS resource set includes n SRS ports in total, m is a positive integer greater than or equal to 1 and less than or equal to n, q It is a positive integer greater than or equal to 1.

Example 1: The first information in the first indication message is used to indicate the first vector, and the first vector includes n elements. It can be understood that the number of elements of the first vector is n elements.

In this case, the first indication message includes first information, where the first information is used to indicate values of all elements in the first vector, or the first information is the first vector. After the access network device receives the first indication message, the access network device may directly obtain the first vector according to the first information. Through such a method, the steps of processing the first information to obtain the first vector are reduced on the access network device side, and the computational complexity on the access network device side is reduced.

Specifically, after the terminal device receives the downlink reference signal sent by the access network device, according to the energy (or amplitude) of the downlink reference signal received by each port and the first reference quantity, determine the corresponding element of each port in the first vector value. In one possibility, the terminal device sends the value of the corresponding element of each port in the first vector (that is, the first information) to the access network device, further, the access network device according to the corresponding element of each port in the first vector Values of , processed (eg combined) to obtain the first vector. Or, in another possibility, the terminal device processes (for example, combines) the first vector based on the values of the corresponding elements of each port in the first vector, and the terminal device sends the first vector (that is, the first vector) to the access network device. information). In this case, the first vector determined by the access network device according to the first indication message can be expressed as [β ₀ ... β _i ... β _n-1 ], where β _i is related to the i-th Corresponding to ports receiving downlink reference signals, i=0, 1, . . . , n-1.

Wherein, the first reference quantity may be the maximum value among the energy (or amplitude) of the downlink reference signals received by each port of the terminal device. Alternatively, the first reference quantity is the minimum value among the energy (or amplitude) of the downlink reference signals received by each port of the terminal device. Alternatively, the first reference quantity is the energy (or amplitude) of the downlink reference signal received by any port of the terminal device. Alternatively, the first reference quantity is a common divisor, a greatest common divisor, or a preset value of the energy (or amplitude) of the downlink reference signal received by each port of the terminal device. Wherein, the preset value may be specified by a communication protocol between the terminal device and the access network device, or may be negotiated between the access network device and the terminal device, and no specific example is given here. When the first reference quantity is a preset value, when the first vector is used to indicate the amplitude ratio of the downlink reference signal received by each port, the preset value of the first reference quantity corresponding to the first vector is the same as the first vector When used to indicate the energy ratio of the downlink reference signal received by each port, the preset value of the first reference quantity corresponding to the first vector may be the same or different, which is not specifically limited in this application.

For example, n in the first scenario is 4, and the terminal device includes 4 ports: port 0, port 1, port 2, and port 3. Among them, the energy (or amplitude) of the downlink reference signal received by port 0 is

The energy (or amplitude) of the downlink reference signal received by port 1 is 2, and the energy (or amplitude) of the downlink reference signal received by port 2 is

The energy (or amplitude) of the downlink reference signal received by port 3 is 1. Further, the terminal device uses the maximum value of the energy (or amplitude) of the downlink reference signal received in the four ports as the first reference quantity, and determines the value of the corresponding element of the four ports in the first vector, and obtains that port 0 is in The value of the corresponding element in the first vector is 1, and the value of the corresponding element of port 1 in the first vector is

The value of the corresponding element of port 2 in the first vector is

The value of the corresponding element of port 3 in the first vector is

In an example, the terminal device sends a first indication message carrying first information to the access network device, where the first information includes the value 1,

and

The first information may not be a vector. In another example, the terminal device sends a first indication message carrying first information to the access network device, where the first information is the first vector

Example 2: The first information in the first indication message indicates n-1 elements in the first vector.

In a possible implementation, the first information in the first indication message is used to indicate a first vector, and the first vector includes n-1 elements. It can be understood that the number of elements of the first vector is n-1 elements.

In this case, the first indication message includes first information, where the first information is used to indicate values of all elements in the first vector, or the first information is the first vector. After the access network device receives the first indication message, the access network device may directly obtain the first vector according to the first information.

Specifically, after the terminal device receives the downlink reference signal from the access network device, according to the energy (or amplitude) and the second reference quantity of the downlink reference signal received by each of the n ports, the terminal device sends a signal to the access network device Send the first vector. Wherein, the second reference quantity may be the energy or amplitude of the downlink reference signal received by the first reference port, and the first reference port is one of the n ports of the terminal device; the first vector is used to indicate other ports (i.e. Amplitude ratios or energy ratios of downlink reference signals received by ports other than the first reference port among the n ports of the terminal device.

In another possible implementation, the first information in the first indication message is used to indicate a first vector, and the first vector includes n elements. It can be understood that in this case, the first vector includes n elements, and the first information is used to indicate n-1 elements in the first vector. Wherein, the first information is used to indicate n-1 elements, it can be understood that the first information is used to indicate the value of n-1 elements in the first vector; or, the first information includes n-1 elements in the first vector 1-element vector.

In this case, after the access network device obtains the n-1 elements in the first vector through the first information, the access network device determines the first vector according to the n-1 elements in the first vector. In a possible implementation, the access network obtains second information, which is used to indicate elements in the first vector that are not reported by the terminal device; further, the access network device The n-1 elements in , determine the first vector. The second information may be carried in the first indication message; or, the second information may also be carried in other messages reported by the terminal device; or, the second information may also be obtained according to a communication protocol. Through such a method, compared with the first case, the terminal device can reduce the amount of data reported to the access network device, thereby saving communication transmission resources.

Specifically, after the terminal device receives the downlink reference signal from the access network device, according to the energy (or amplitude) of the downlink reference signal received by each port and the second reference quantity, determine the corresponding element of each port in the first vector value. The second reference quantity may be energy or amplitude of a downlink reference signal received by a first reference port, where the first reference port is one of n ports of the terminal device, and the second information is an index of the first reference port. Further, the terminal device sends the first information and the second information to the access network device, and the access network device determines a third vector containing n-1 elements according to the first information, and in the third vector, the first reference port Insert a value at the element position indicated by the index to obtain the first vector. In one embodiment, the inserted value may be 1. In this case, the first vector determined by the access network device according to the first indication message can be expressed as [β ₀ ... β _i ... β _n-1 ], where β _i is related to the i-th Corresponding to ports receiving downlink reference signals, i=0, 1, . . . , n-1.

Wherein, the second reference quantity may be the maximum value of the energy (or amplitude) of the downlink reference signal received by each port of the terminal device, and at this time, the first reference port is the energy of the downlink reference signal received by each port of the terminal device The port corresponding to the maximum value in (or amplitude); or, the second reference quantity is the minimum value in the energy (or amplitude) of the downlink reference signal received by each port of the terminal device, and at this time the first reference port is the terminal device The port corresponding to the minimum value of the energy (or amplitude) of the downlink reference signal received by each port of the terminal device; or, the second reference quantity is the energy (or amplitude) of the downlink reference signal received by any port of the terminal device, where When the first reference port is the port corresponding to the second reference quantity. For ease of understanding, the second reference quantity is used below as the maximum value of the energy (or amplitude) of the downlink reference signal received by each port of the terminal device, and the first reference port is the energy (or amplitude) of the downlink reference signal received by each port of the terminal device. The port corresponding to the maximum value in the energy (or amplitude) is illustrated as an example.

Exemplarily, in the first scenario, n is 4, and the four ports of the terminal device are respectively: port 0, port 1, port 2, and port 3. Among them, the energy (or amplitude) of the downlink reference signal received by port 0 is

The energy (or amplitude) of the downlink reference signal received by port 3 is 1. Further, the terminal device uses the maximum value of the energy (or amplitude) of the downlink reference signal received by the four ports as the second reference quantity, and determines the value of the corresponding element of the four ports in the first vector, and obtains that port 0 is in The value of the corresponding element in the first vector is 1, and the value of the corresponding element of port 1 in the first vector is

The value of the corresponding element of port 2 in the first vector is

The value of the corresponding element of port 3 in the first vector is

In an example, the terminal device sends a first indication message carrying first information to the access network device, where the first information includes a value

and

The first information can be a vector. In another example, the terminal device sends the first indication message carrying the first information to the access network device, where the first information is the third vector

The access network device receives second information from the terminal device, where the second information is index 0 corresponding to port 0 (the first reference port). Further, the access network device inserts the element value 1 into the element position indicated by the index of the first reference port in the third vector indicated by the first information, and the first vector is obtained as

Example 3: The first information in the first indication message indicates m elements of the first vector. Wherein, the SRS ports corresponding to the ports corresponding to the m elements belong to the same SRS resource. The first information is used to indicate the m elements in the first vector, which can be understood as the first information is used to indicate the values of the m elements in the first vector; or, the first information includes the m elements in the first vector of vectors.

In a possible implementation, the first information in the first indication message is used to indicate a first vector, and the first vector includes m elements. It can be understood that the number of elements of the first vector is m elements.

In this case, when m is equal to n and q is 1, reference may be made to the specific implementation manner of the foregoing example 1, and details are not described here. When m is greater than or equal to 1 and less than n, and q is greater than 1, the first indication message includes first information, where the first information is used to indicate values of all elements in the first vector, or the first information is the first vector. After the access network device receives the first indication message, the access network device may directly obtain the first vector according to the first information.

Specifically, after the terminal device receives the downlink reference signal from the access network device, according to the energy (or amplitude) of the downlink reference signal received by the m ports and the third reference quantity, it is determined that the m ports correspond to The value of the element, the SRS ports corresponding to the m ports belong to the same SRS resource. The terminal device sends first information to the access network device, where the first information is used to indicate values of corresponding elements of the m ports in the first vector.

In another possible implementation, the first information in the first indication message is used to indicate a first vector, and the first vector includes n elements. It can be understood that in this case, the first vector includes n elements, and the first information is used to indicate m elements in the first vector.

In this case, when m is equal to n and q is 1, reference may be made to the specific implementation manner of the foregoing example 1, and details are not described here. When m is greater than or equal to 1 and less than n, and q is greater than 1, after the access network device obtains the m elements in the first vector through the first information, the access network device determines the first vector. In a possible implementation, the access network device performs q times of polling on the m elements, and determines the result of the q times of polling as the first vector.

Specifically, after the terminal device receives the downlink reference signal from the access network device, according to the energy (or amplitude) of the downlink reference signal received by the m ports and the third reference quantity, it is determined that the m ports correspond to The value of the element, the SRS ports corresponding to the m ports belong to the same SRS resource. The terminal device sends first information to the access network device, where the first information is used to indicate values of corresponding elements of the m ports in the first vector. The access network device performs q times of polling on values of elements corresponding to the m ports in the first vector, and determines the result of the q times of polling as the first vector. In this case, the first vector determined by the access network device according to the first indication message can be expressed as [β _km ... β _km+j ... β _(k+1)m-1 ... β _km ... β _km+j ... β _(k+1)m-1 ], where β _km+j corresponds to the terminal device's km+jth port for receiving the downlink reference signal, j=0, 1, ..., m-1, k=0, 1, ..., q-1.

Wherein, the third reference quantity is the maximum value among the energies (or amplitudes) of the downlink reference signals received by the m ports; or, the third reference quantity is the energy (or amplitude) of the downlink reference signals received by the m ports. Amplitude); or, the third reference quantity is the energy (or amplitude) of the downlink reference signal received by any one of the m ports; or, the third reference quantity is the energy (or amplitude) of the downlink reference signal received by the m ports The common divisor, the greatest common divisor, or a preset value of the energy (or amplitude) of the downlink reference signal. For ease of understanding, the following uses the third reference quantity as the maximum value among the energies (or amplitudes) of the downlink reference signals received by the m ports for an exemplary description.

Exemplarily, n in the first scenario is 4, m is 2, and q is 2. That is, the access network device configures two SRS resources for the terminal device: the first SRS resource and the second SRS resource; the four ports of the terminal device are: port 0, port 1, port 2 and port 3; the 4 ports of the terminal device The SRS ports are: SRS port 0, SRS port 1, SRS port 2, and SRS port 3. Wherein, the corresponding relationship between each port of the terminal device, each SRS port, and each SRS resource can be referred to in Table 3.

table 3

After the terminal device receives the downlink reference signal sent by the access network device, the terminal device determines that the energy (or amplitude) of the downlink reference signal received by port 0 is

The energy (or amplitude) of the downlink reference signal received by port 3 is 1. The terminal device determines to report to the access network device the energy (or amplitude) of the downlink reference signal received by the port (port 0 and port 1) corresponding to the first SRS resource, and further, the terminal device can use the downlink reference signal received by port 0 The energy of the signal is determined as a third reference quantity, and the first The value of the corresponding element of the port (port 0 and port 1) corresponding to the SRS resource in the first vector, that is, the value of the corresponding element of port 0 in the first vector is 1, and the value of the corresponding element of port 1 in the first vector is

In an example, the terminal device sends a first indication message carrying first information to the access network device, where the first information includes the value 1 and

But the first information is not a vector. In another example, the terminal device sends a first indication message carrying first information to the access network device, where the first information is a vector indicating two elements of the first vector

The access network device performs two polls on the two elements indicated by the first information, and determines the result of the two polls as the first vector

Example 4: The first information in the first indication message indicates m-1 elements in the first vector. Wherein, the SRS ports corresponding to the ports corresponding to the m-1 elements belong to the same SRS resource.

In a possible implementation, the first information in the first indication message is used to indicate the first vector, and the first vector includes m-1 elements. It can be understood that the number of elements of the first vector is m-1 elements.

In this case, when m is equal to n and q is 1, reference may be made to the specific implementation manner of the foregoing example 2, which will not be repeated here. When m is greater than or equal to 1 and less than n, and q is greater than 1, the first indication message includes first information, where the first information is used to indicate values of all elements in the first vector, or the first information is the first vector. After the access network device receives the first indication message, the access network device may directly obtain the first vector according to the first information.

Specifically, after the terminal device receives the downlink reference signal from the access network device, according to the energy (or amplitude) of the downlink reference signal received by m ports and the fourth reference quantity, the terminal device sends the first vector . Wherein, the fourth reference quantity is the energy or amplitude of the downlink reference signal received by the second reference port, and the second reference port is one of the m ports. The first vector is used to indicate amplitude ratios or energy ratios of downlink reference signals received by other ports (that is, ports other than the second reference port among the m ports of the terminal device).

It can be understood that the first vector includes n elements, and the first information is used to indicate m-1 elements in the first vector. The first information is used to indicate the m-1 elements in the first vector, and it can be understood that the first information is used to indicate the value of the m-1 elements in the first vector; or, the first information includes the first vector A vector of m-1 elements in .

In this case, when m is equal to n and q is 1, reference may be made to the specific implementation manner of the foregoing example 2, which will not be repeated here. When m is greater than or equal to 1 and less than n, and q is greater than 1, after the access network device obtains m-1 elements in the first vector through the first information, the access network device Elements determine the first vector. In a possible implementation, the access network device acquires third information, which is used to indicate elements in the first vector that belong to the same element group as the m-1 elements but are not reported by the terminal device, where the elements belonging to the same The SRS ports corresponding to the ports corresponding to the elements in the element group belong to the same SRS resource; further, the access network device determines the first vector according to the third information and the m-1 elements in the first vector. It should be known that the third information may be carried in the first indication message; or, the third information may also be carried in other messages reported by the terminal device; or, the third information may also be obtained according to a communication protocol. Through such a method, compared with Example 1, Example 2, and Example 3, the terminal device can reduce the amount of data reported to the access network device, thereby saving communication transmission resources.

Specifically, after the terminal device receives the downlink reference signal from the access network device, according to the energy (or amplitude) of the downlink reference signal received by the m ports and the fourth reference quantity, it is determined that the m ports correspond to The value of the element, the SRS ports corresponding to the m ports belong to the same SRS resource. The fourth reference quantity is the energy or amplitude of the downlink reference signal received by the second reference port, where the second reference port is one of the m ports, and the third information is the index of the second reference port. Further, the terminal device sends the first information and the third information to the access network device, and the access network device determines a fourth vector containing m-1 elements according to the first information, and assigns the vector indicated by the index of the second reference port to Insert element 1 at element position to get the fifth vector. Further, the access network device polls the elements in the fifth vector for q times, and determines the result of the q times of polling as the first vector. In this case, the first vector determined by the access network device according to the first indication message can be expressed as [β _km ... β _km+j ... β _(k+1)m-1 ... β _km ... β _km+j ... β _(k+1)m-1 ], where β _km+j corresponds to the terminal device's km+jth port receiving the downlink reference signal, j=0, 1, ..., m-1, k=0, 1, ..., q-1.

It should be noted that the fourth reference quantity is the maximum value of the energy (or amplitude) of the downlink reference signals received by the m ports, and at this time, the second reference port is the maximum value of the downlink reference signals received by the m ports. The port corresponding to the maximum value in the energy (or amplitude); or, the fourth reference quantity is the minimum value in the energy (or amplitude) of the downlink reference signals received by the m ports, and at this time, the second reference port is the The port corresponding to the minimum value of the energy (or amplitude) of the downlink reference signal received by the m ports; or, the fourth reference quantity is the energy (or amplitude) of the downlink reference signal received by any port of the m ports ), at this time the second reference port is the port corresponding to the fourth reference quantity. For ease of understanding, the fourth reference quantity is the maximum value of the energy (or amplitude) of the downlink reference signals received by the m ports, and the second reference port is the energy (or amplitude) of the downlink reference signals received by the m ports. Or the port corresponding to the maximum value in the amplitude) for an example description.

Exemplarily, n in the first scenario is 4, m is 2, and q is 2. That is, the access network device configures two SRS resources for the terminal device: the first SRS resource and the second SRS resource; the four ports of the terminal device are: port 0, port 1, port 2 and port 3; the 4 ports of the terminal device The SRS ports are: SRS port 0, SRS port 1, SRS port 2, and SRS port 3. Wherein, for the corresponding relationship between each port of the terminal device, each SRS port, and each SRS resource, refer to the aforementioned Table 3. After the terminal device receives the downlink reference signal sent by the access network device, the terminal device determines that the energy (or amplitude) of the downlink reference signal received by port 0 is

The energy (or amplitude) of the downlink reference signal received by port 3 is 1. The terminal device determines to report to the access network device the energy (or amplitude) of the downlink reference signal received by the port (port 0 and port 1) corresponding to the first SRS resource, and further, the terminal device can use the downlink reference signal received by port 0 The energy of the signal is determined as the fourth reference quantity, and according to the fourth reference quantity and the energy (or amplitude) of the downlink reference signal received by port 1, it is determined that the ports (port 0 and port 1) corresponding to the first SRS resource are in the first The value of the corresponding element in the vector, the value of the corresponding element of port 0 in the first vector is 1, and the value of the corresponding element of port 1 in the first vector is

But the first information is not a vector. In another example, the terminal device sends the first indication message carrying the first information to the access network device, where the first information is a fourth vector indicating one element of the first vector

The access network device receives third information from the terminal device, where the third information is index 0 corresponding to port 0 (second reference port). Further, the access network device inserts the element value 1 into the element position indicated by the index of the second reference port in the fourth vector indicated by the first information, and the fifth vector is obtained as

Further, the access network device performs two polls on the elements in the fifth vector, and determines the result of the two polls as the first vector

It should be declared that each element in the vectors mentioned in this application (including the first vector, the second vector, the third vector, the fourth vector, the fifth vector and the sixth vector) is quantized uniformly or non-uniformly owned.

Please refer to FIG. 4 . FIG. 4 is a schematic flowchart of a communication method provided by an embodiment of the present application. As shown in FIG. 4 , the execution subject of the communication method may be an access network device or a chip in the access network device, or the execution subject may be a terminal device or a chip in a terminal and a device. FIG. 4 uses an access network device and a terminal device as an example for illustration. in:

S401. The access network device receives a first indication message from a terminal device, where the first indication message is used to indicate a first vector.

Wherein, for the specific implementation of S401, refer to the description of the specific implementation of S301 above, and details will not be repeated here.

S402. The access network device receives the SRS from the terminal device, where the SRS port for the terminal device to send the SRS is in one-to-one correspondence with the port for the terminal device to receive the downlink reference signal.

It should be noted that there is a one-to-one correspondence between the SRS ports of the terminal device and the ports for receiving downlink reference signals, which can be understood as the number of SRS ports of the terminal device is the same as the number of ports for receiving downlink reference signals, and each SRS port corresponds to a signal port. For a group of corresponding SRS ports and ports for receiving downlink reference signals, the processing method for the terminal device to send the SRS through the SRS port is the same as the processing method for the terminal device to receive the downlink reference signal through the port. For example, the access network device configures four SRS ports for the terminal device, the terminal device has four ports for receiving downlink reference signals, and the SRS ports of the terminal device correspond to the ports for receiving downlink reference signals one by one. When the 4 ports receiving the downlink reference signal receive the downlink reference signal, the downlink reference signal is multiplied by a preprocessing matrix W with a dimension of 4*4, and the terminal device also multiplies the SRS when sending the SRS through the four SRS ports. with a same preconditioning matrix W, and vice versa. The access network device configures at least one SRS resource set for the terminal device for antenna selection. For example, in the aforementioned first scenario, the terminal device includes n ports, and n is a positive integer greater than or equal to 1; the access network device is a terminal device At least one SRS resource set is configured, and the at least one SRS resource set is used for antenna selection. Wherein, the at least one SRS resource set includes q SRS resources, each SRS resource includes m SRS ports, and the at least one SRS resource set includes n SRS ports in total, and the n SRS ports and the terminal equipment include n ports. For one-to-one correspondence, m is a positive integer greater than or equal to 1 and less than or equal to n, and q is a positive integer greater than or equal to 1. When m is equal to n and q is 1, the first scenario is a non-antenna selection scenario; when m is greater than or equal to 1 and smaller than n, and q is greater than 1, the first scenario is an antenna selection scenario.

S403. The access network device sends downlink data to the terminal device based on the SRS and the first vector.

The access network device precodes the downlink data to be sent based on the SRS and the first vector, and sends the downlink data to the terminal device. Alternatively, the access network device determines a downlink precoding matrix based on the SRS and the first vector, and then performs precoding on the downlink data to be sent based on the downlink precoding matrix, and sends the downlink data to the terminal device.

In a possible implementation, the access network device obtains downlink channel information based on the SRS and the first vector, the downlink channel information includes downlink channel information corresponding to multiple ports, and the magnitude of the downlink channel information corresponding to the multiple ports The ratio or energy ratio is associated with the magnitude ratio or energy ratio indicated by the first vector. Further, the access network device precodes the downlink data based on the downlink channel information; the access network device sends the downlink data to the terminal device.

Wherein, the downlink channel information includes downlink channel information corresponding to multiple ports, which can be understood as: the downlink channel information includes downlink channel information of all ports (that is, n ports in this application) that the terminal device receives downlink reference signals. When the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signals received by all ports (that is, n ports), the downlink channel information of the n ports in the downlink channel information is different from the n elements are associated. When the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by some ports (that is, one of n-1 ports, m ports, or m-1 ports), the downlink channel information The downlink channel information of n-1 ports (or m ports, or m-1 ports) is associated with the n-1 elements (or m elements, or m-1 elements) elements indicated by the first vector .

Wherein, the amplitude ratio or energy ratio of the downlink channel information corresponding to multiple ports in the downlink channel information is associated with the amplitude ratio or energy ratio of the downlink reference signal received by each port indicated by the first vector, it can be understood that the downlink The amplitude ratio (or energy ratio) of the downlink channel information corresponding to each port in the channel information is the same as, or approximately the same as, the amplitude ratio (or energy ratio) of the downlink reference signal received by each port indicated by the first vector (that is, in fluctuate within a certain range allowed). That is to say, when the first vector is used to indicate the amplitude ratio of the downlink reference signal received by each port, the amplitude ratio of the downlink channel information corresponding to each port is the same (or approximately the same) as the amplitude ratio indicated by the first vector . When the first vector is used to indicate the energy ratio of the downlink reference signal received by each port, the energy ratio of the downlink channel information corresponding to each port is the same (or approximately the same) as the energy ratio indicated by the first vector.

After receiving the SRS, the access network device performs uplink channel estimation based on the SRS to obtain uplink channel information. Further, the access network device obtains downlink channel information based on the uplink channel information and the first vector. The downlink channel information will be described below in conjunction with the four situations in which the first indication message indicates the first vector in the aforementioned S301.

In Example 1 and Example 2 where the first indication message in S301 indicates the first vector, when the number of the first vector is n elements, the first vector can be expressed as [β ₀ ... β _i ... β _n-1 ], wherein, β _i corresponds to the i-th port, i=0, 1, ..., n-1. In this case, the downlink channel information H ^DL satisfies the following formula (1).

in,

is the uplink channel information corresponding to the i-th SRS port, and the i-th SRS port corresponds to the i-th port receiving the downlink reference signal. When the first vector is used to indicate the energy ratio of the downlink reference signal received by each port, the λ _i is

When the first vector is used to indicate the amplitude ratio of downlink reference signals received by each port, the λ _i is β _i . Should

Can be a numeric element, a vector, or a matrix.

In the scenario where the first indication message in S301 indicates the antenna selection corresponding to the third and fourth examples of the first vector, when the number of the first vector is n elements, the first vector can be expressed as [β _km . .. β _km+j ... β _(k+1)m-1 ... β _km ... β _km+j ... β _(k+1)m-1 ], where β _km+j Corresponding to the km+jth port, j=0, 1, . . . , m−1, k=0, 1, . . . , q−1. In this case, the downlink channel information H ^DL satisfies the following formula (2).

in,

When the first vector is used to indicate the amplitude ratio of downlink reference signals received by each port, λ _j is β _km+j . Should

Can be a numeric element, a vector, or a matrix.

It should be known that the downlink channel information mentioned in this application is the downlink channel information carried on one or more subcarriers, and the downlink reference signal mentioned in this application is the downlink reference signal carried on one or more subcarriers, Unless otherwise stated, the full text is the same.

It can be seen that through the communication method provided in Figure 4, the access network device can improve the accuracy of downlink precoding according to the auxiliary information (the energy ratio or amplitude ratio of the downlink reference signal received by each port of the terminal device), and then can improve the downlink precoding accuracy. throughput.

In a possible scenario, the non-ideal factors brought by the hardware will not change within a certain time range, that is, the non-ideal factors brought by the hardware have long-term stability. In this scenario, the access network device can send downlink data to the terminal device according to the same first vector within a certain time range, thereby reducing the number of times the terminal device reports the first vector and the amount of data reported by the terminal device. Thus, transmission resources are saved.

In other words, the access network device receives a first indication message from the terminal device at the first moment, where the first indication message is used to indicate the first vector. At the second moment, the access network device sends downlink data to the terminal device based on the first vector. Wherein, the second moment is any moment after the first moment, and the time length between the second moment and the first moment is smaller than the first time length threshold. It should be noted that the first time length threshold can be adjusted accordingly according to specific application scenarios, so this application does not specifically limit the value of the first time length threshold here; in addition, the "moment" here is a broad term Conceptually, a "moment" may include S401 and S402 in FIG. 4, and may also include S401, S402, and S403 in FIG. 4.

Specifically, the access network equipment receives the first indication message and the SRS from the terminal equipment at the first moment, and performs uplink channel estimation based on the SRS to obtain the uplink channel information at the first moment. The first indication message is used to indicate the first vector . At the second moment, the access network device receives the SRS from the terminal device, and performs uplink channel estimation based on the SRS to obtain uplink channel information at the second moment. Further, the access network device obtains the downlink channel information at the second moment based on the uplink channel information at the first moment, the first vector at the first moment, and the uplink channel information at the second moment, and sends the terminal information to the terminal based on the downlink channel information The device sends downlink data.

Combining the above four situations in which the first indication message indicates the first vector in S301, the first time is time t, the second time is t+s time, and the first time length threshold is T as an example. , where s=0, 1, ..., T.

In case 1 and case 2 where the first indication message in S301 indicates the first vector, when the number of the first vector is n elements, the first vector at time t can be expressed as

in,

Corresponding to the i-th port, i=0, 1, . . . , n−1. In this case, the downlink channel information at time t+s

The following formula (3) is satisfied.

in,

is the uplink channel information corresponding to the i-th SRS port at time t,

is the uplink channel information corresponding to the i-th SRS port at time t+s, and the i-th SRS port corresponds to the i-th port receiving the downlink reference signal. When the first vector is used to indicate the energy ratio of the downlink reference signal received by each port, the

for

When the first vector is used to indicate the amplitude ratio of the downlink reference signal received by each port, the

for

In the scenario where the first indication message in S301 indicates the antenna selection corresponding to the third and fourth examples of the first vector, when the number of the first vector is n elements, the first vector at time t can be expressed as

in,

Corresponding to the km+jth port, j=0, 1, . . . , m−1, k=0, 1, . . . , q−1. In this case, the downlink channel information at time t+s

The following formula (4) is satisfied.

in,

is the uplink channel information corresponding to the jth SRS port at time t,

is the uplink channel information corresponding to the jth SRS port at time t+s; when the first vector is used to indicate the energy ratio of the downlink reference signal received by each port,

for

When the first vector is used to indicate the amplitude ratio of the downlink reference signal received by each port,

for

In the antenna selection scenario, since the power (or energy) or amplitude of the SRS sent by the terminal device for antenna selection is not necessarily the same each time, in this scenario, how does the access network device perform accurate downlink precoding To improve the downlink throughput is an urgent problem to be solved. Take the aforementioned first scenario as an example for antenna selection. In the first scenario in this case: the terminal device includes n ports, and n is a positive integer greater than or equal to 1; the access network device configures at least An SRS resource set, the at least one SRS resource set is used for antenna selection. Wherein, the at least one SRS resource set includes q SRS resources, each SRS resource includes m SRS ports, and the at least one SRS resource set includes n SRS ports in total, and the n SRS ports and the terminal equipment include n ports. For one-to-one correspondence, m is a positive integer greater than or equal to 1 and less than n, and q is a positive integer greater than 1.

In this antenna selection scenario, please refer to FIG. 5 , which is a schematic flowchart of a communication method provided in an embodiment of the present application. As shown in FIG. 5 , the execution subject of the communication method may be an access network device or a chip in the access network device, or the execution subject may be a terminal device or a chip in a terminal and a device. FIG. 5 uses an access network device and a terminal device as an example for illustration. in:

S501. The access network device receives a first indication message from a terminal device, where the first indication message is used to indicate a first vector. Wherein, the elements in the first vector correspond to the ports through which the terminal equipment receives the downlink reference signal, and the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signals received by each port.

Wherein, for a specific implementation manner of S501, reference may be made to the description of the foregoing specific implementation manners of S301 or S401, and details are not repeated here.

S502. The access network device receives the SRS from the terminal device, where the SRS port for the terminal device to send the SRS is in one-to-one correspondence with the port for the terminal device to receive the downlink reference signal.

Wherein, for the specific implementation manner of S502, reference may be made to the description of the foregoing specific implementation manner of S402, which will not be repeated here.

S503. The access network device receives a second indication message from the terminal device, where the second indication message is used to indicate a second vector, and the second vector is used to indicate the SRS resource sent by the terminal device on each SRS resource used for antenna selection Power ratio or amplitude ratio of SRS.

Wherein, the power ratio (or amplitude ratio) of the SRS can be understood as the power ratio (or amplitude ratio) on one or more subcarriers.

The access network device configures q SRS resources for antenna selection for the terminal device, and after the terminal device sends SRSs on the q SRS resources for antenna selection, it sends a message indicating the second vector to the access network device A second indication message. Wherein, the elements in the second vector are associated with the SRS resource used for antenna selection, and the second vector is used to indicate the power ratio or amplitude ratio of the SRS sent on the associated SRS resource.

In a possible implementation, the elements in the second vector correspond to the SRS resources used for antenna selection one by one, and the second vector is used to indicate the amplitude ratio or the amplitude ratio sent on each SRS resource used for antenna selection. energy ratio. It can be understood that the access network device configures q SRS resources for antenna selection for the terminal device, and the number of elements in the second vector is q.

For ease of understanding, the manner in which the second indication message indicates the second vector and the second vector are explained below by taking the foregoing antenna selection scenario as an example.

Manner 1: The fourth information in the second indication message indicates q elements of the second vector. It can be understood that the second vector includes q elements, and the fourth information is used to indicate all elements of the second vector.

In this case, the second indication message includes fourth information, where the fourth information is used to indicate values of all elements in the second vector, or the fourth information is the second vector. After the access network device receives the second indication information, the access network device may directly obtain the second vector according to the fourth information. Through such a method, the steps of processing the fourth information to obtain the second vector are reduced on the access network device side, and the computational complexity on the access network device side is reduced.

Specifically, after the terminal device sends the SRS on the q SRS resources used for antenna selection, according to the power (or amplitude) of the SRS sent on each SRS resource used for antenna selection and the fifth reference quantity, determine each Values of elements corresponding to the SRS resources selected by the antenna in the second vector. In one possibility, the terminal device directly sends the value (that is, the fourth information) of the corresponding element of each SRS resource used for antenna selection in the second vector to the access network device, and further, the access network device Based on the value of the corresponding element of the SRS resource selected by the antenna in the second vector, the second vector is obtained through processing (for example, combination). Or, in another possibility, the terminal device processes (for example, combines) the value of the corresponding element in the second vector based on each SRS resource used for antenna selection to obtain the second vector, and further, the terminal device sends the information to the access network device The second vector (ie the fourth information) is sent. In this case, the second vector determined by the access network device according to the second indication message can be expressed as [α ₀ ... α _l ... α _q-1 ], where α _l is related to the Corresponds to the power or amplitude of the SRS sent on the SRS resources used for antenna selection, l=0,1,...,q-1.

Wherein, the fifth reference quantity may be the maximum value of the power (or amplitude) of the SRS sent on the q SRS resources used for antenna selection. Alternatively, the fifth reference quantity may be the minimum value of the power (or amplitude) of the SRSs sent on the q SRS resources used for antenna selection. Alternatively, the fifth reference quantity may be the power (or amplitude) of the SRS sent on any SRS resource among the q SRS resources used for antenna selection. Alternatively, the fifth reference quantity may be a common divisor, a greatest common divisor, or a preset value of the power (or amplitude) of the SRSs sent on the q SRS resources used for antenna selection. Wherein, the preset value may be specified by a communication protocol between the terminal device and the access network device, or may be negotiated between the access network device and the terminal device, and no specific example is given here. Moreover, when the fifth reference quantity is a preset value, when the second vector is used to indicate the power of the SRS transmitted on each SRS resource used for antenna selection, the corresponding preset value of the fifth reference quantity is the same as the second vector When used to indicate the amplitude ratio of the SRS sent on each SRS resource used for antenna selection, the preset value of the corresponding fifth reference quantity may be the same or different, which is not specifically limited in this application.

For example, in the antenna selection scenario, a resource set for antenna selection configured by the access network device for the terminal device includes three SRS resources: SRS resource 0, SRS resource 1, and SRS resource 2, and the terminal device is on SRS resource 0. The power (or amplitude) of the sent SRS is 2, the power (or amplitude) of the SRS sent by the terminal device on SRS resource 1 is 4, and the power (or amplitude) of the SRS sent by the terminal device on SRS resource 2 is

Further, the terminal device uses the maximum value of the SRS power (or amplitude) transmitted on the 3 SRS resources as the fifth reference quantity, determines the value of the corresponding element of the 3 SRS resources in the second vector, and obtains the SRS resource 0 The value of the corresponding element in the second vector is

The value of the corresponding element of SRS resource 1 in the second vector is 1, and the value of the corresponding element of SRS resource 2 in the second vector is

In an example, the terminal device sends a second indication message carrying fourth information to the access network device, where the fourth information includes a value

1 and

But the fourth information is not a vector. In another example, the terminal device sends a second indication message carrying fourth information to the access network device, where the fourth information is the second vector

Manner 2: The fourth information in the second indication message indicates q-1 elements in the second vector.

In a possible implementation, the fourth information in the second indication message is used to indicate the second vector, where the second vector includes q-1 elements. It can be understood that the number of elements of the second vector is q-1 elements.

In this case, the second indication message includes fourth information, where the fourth information is used to indicate values of all elements in the second vector, or the fourth information is the second vector. After the access network device receives the second indication information, the access network device may directly obtain the second vector according to the fourth information.

Specifically, after the terminal device sends the SRS on the q SRS resources used for antenna selection, according to the power (or amplitude) of the SRS sent on each SRS resource used for antenna selection and the sixth reference quantity, the terminal device sends The network access device sends the second vector. Wherein, the sixth reference quantity is the power (or amplitude) of the SRS transmitted on the first reference SRS resource, and the first reference SRS resource is any one of the q SRS resources used for antenna selection; the second vector is used for Indicate the power ratio or amplitude ratio of the SRS sent on other SRS resources (that is, other SRS resources except the first reference SRS resource among the q SRS resources used for antenna selection).

In another possible implementation, the fourth information in the second indication message is used to indicate the second vector, and the second vector includes q elements. It can be understood that in this case, the second vector includes q elements, and the fourth information is used to indicate q-1 elements in the second vector. Wherein, the fourth information is used to indicate the q-1 elements in the second vector, it can be understood that the fourth information is used to indicate the value of the q-1 elements in the second vector; or, the fourth information includes the q-1 elements in the second vector A vector of q-1 elements in a two-vector.

In this case, after the access network device acquires the q-1 elements in the second vector through the fourth information, the access network device determines the second vector according to the q-1 elements in the second vector. In a possible implementation manner, the access network obtains fifth information, and the fifth information is used to indicate elements in the second vector that are not reported by the terminal device; further, the access network device obtains the fifth information according to the fifth information and the second The q-1 elements in the vector determine the second vector. It should be known that the fifth information may be carried in the second indication message; or, the fifth information may also be carried in other messages reported by the terminal device; or, the fifth information may be obtained according to a communication protocol. Through such a method, compared with the first method, the terminal device can reduce the amount of data reported to the access network device, thereby saving communication transmission resources.

Specifically, after the terminal device sends the SRS on the q SRS resources used for antenna selection, according to the power (or amplitude) of the SRS sent on each SRS resource used for antenna selection and the sixth reference quantity, determine each Values of elements corresponding to the SRS resources selected by the antenna in the second vector. The sixth reference quantity is the power (or amplitude) of the SRS transmitted on the first reference SRS resource, and the first reference SRS resource is any one of the q SRS resources used for antenna selection, and the fifth information is the first - An index of reference SRS resources. Further, the terminal device sends the fourth information and the fifth information to the access network device, and the access network device determines a sixth vector containing q-1 elements according to the fourth information, and first refers to the SRS in the sixth vector The second vector is obtained by inserting the element value 1 at the element position indicated by the index of the resource. In this case, the second vector determined by the access network device according to the second indication message can be expressed as [α ₀ ... α _l ... α _q-1 ], where α _l is related to the Corresponds to the power or amplitude of the SRS sent on the SRS resources used for antenna selection, l=0,1,...,q-1.

Wherein, the sixth reference amount may be the maximum value of the SRS power (or amplitude) transmitted on the q SRS resources used for antenna selection, and at this time, the first reference SRS resource is the q SRS resources used for antenna selection The SRS resource corresponding to the maximum value of the power (or amplitude) of the SRS transmitted on the antenna; or, the sixth reference quantity may be the minimum value of the power (or amplitude) of the SRS transmitted on the q SRS resources used for antenna selection At this time, the first reference SRS resource is the SRS resource corresponding to the minimum value of the power (or amplitude) of the SRS transmitted on the q SRS resources used for antenna selection; or, the sixth reference amount may be the q SRS resources used for antenna selection. The power (or amplitude) of the SRS sent on any one of the SRS resources selected by the antenna. At this time, the first reference SRS resource is the SRS resource corresponding to the sixth reference quantity. For ease of understanding, the sixth reference quantity is the maximum value of the power (or amplitude) of the SRS transmitted on the q SRS resources used for antenna selection, and the first reference SRS resource is the q SRS resources used for antenna selection. The SRS resource corresponding to the maximum value among the power (or amplitude) of the SRS transmitted on the resource is described as an example.

Exemplarily, in the antenna selection scenario, a resource set for antenna selection configured by the access network device for the terminal device includes three SRS resources: SRS resource 0, SRS resource 1, and SRS resource 2. The power (or amplitude) of the SRS sent on 0 is 2, the power (or amplitude) of the SRS sent by the terminal device on SRS resource 1 is 4, and the power (or amplitude) of the SRS sent by the terminal device on SRS resource 2 is

Further, the terminal device uses the maximum value of the SRS power (or amplitude) transmitted on the 3 SRS resources as the sixth reference quantity, determines the value of the corresponding element of the 3 SRS resources in the second vector, and obtains the SRS resource 0 The value of the corresponding element in the second vector is

and

But the fourth information is not a vector. In another example, the terminal device sends a second indication message carrying fourth information to the access network device, where the fourth information is the sixth vector

The access network device receives fifth information from the terminal device, where the fifth information is index 1 corresponding to SRS resource 1 (the first reference SRS resource). Further, the access network device inserts an element value 1 into the element position indicated by the index of the first reference SRS resource in the sixth vector indicated by the fourth information, and the second vector is obtained as

S504. The access network device sends downlink data to the terminal device based on the SRS, the first vector, and the second vector.

The access network device precodes the downlink data to be sent based on the SRS, the first vector and the second vector, and sends the downlink data to the terminal device. Alternatively, the access network device determines a downlink precoding matrix based on the SRS, the first vector, and the second vector, and then performs precoding on the downlink data to be sent based on the downlink precoding matrix, and sends the downlink data to the terminal device.

In a possible implementation manner, the access network device obtains downlink channel information based on the SRS, the first vector, and the second vector. Wherein, the downlink channel information includes downlink channel information corresponding to multiple ports, and the amplitude ratio or energy ratio of the downlink channel information corresponding to the multiple ports is equal to the amplitude ratio or the amplitude ratio or energy ratio of the downlink reference signal received by each port indicated by the first vector. The energy ratio is associated with the power ratio or the amplitude ratio of the SRS sent by the terminal device on each SRS resource used for antenna selection indicated by the second vector. Further, the access network device precodes the downlink data based on the downlink channel information; the access network device sends the downlink data to the terminal device. Exemplarily, in the aforementioned antenna selection scenario, the first vector may represent [β _km ... β _km+j ... β _(k+1)m-1 ... β _km ... β _km+j ... β _(k+1)m-1 ], wherein, β _km+j corresponds to the km+jth port, j=0, 1,..., m-1, k= 0, 1, ..., q-1. The second vector can be expressed as [α ₀ ... α _l ... α _q-1 ], where α _l and α _l are related to the SRS transmitted by the terminal device on the lth SRS resource used for antenna selection Corresponding to power or amplitude, l=0, 1, . . . , q-1. In this case, the downlink channel information H ^DL satisfies the following formula (5).

in,

When the first vector is used to indicate the amplitude ratio of downlink reference signals received by each port, λ _j is β _km+j . When the second vector is used to indicate the power ratio of the SRS sent by the terminal equipment on each SRS resource used for antenna selection, η _l is α _l ; When the amplitude ratio of the SRS sent on the SRS resource of , η _l is

Should

Can be a numeric element, a vector, or a matrix.

Through the communication method provided in Figure 5, in the antenna selection scenario, the access network device, according to the auxiliary information (the energy ratio or amplitude ratio of the downlink reference signal received by each port of the terminal device and the Compared with the communication method provided in FIG. 4 , the power ratio or amplitude ratio of the SRS transmitted on the SRS resource can further improve the accuracy of downlink precoding, thereby improving the downlink throughput.

Referring to FIG. 6, FIG. 6 shows a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in Figure 6 can be used to realize some or all functions of the access network device in the embodiment corresponding to the above communication method, or the communication device shown in Figure 6 can be used to realize the function of the terminal device in the embodiment corresponding to the above communication method some or all of the features.

In one embodiment, the communication device shown in FIG. 6 can be used to realize some or all functions of the access network device in the method embodiment described in FIG. 3 , FIG. 4 or FIG. 5; the device can be an access network The device may also be a device in the access network device, or a device that can be matched and used with the access network device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 6 may include a communication module 601 and a processing module 602, and the processing module 602 is used to process data communicated through the communication module 601, wherein:

The communication module 601 is configured to receive a first indication message from a terminal device, where the first indication message is used to indicate a first vector, where elements in the first vector are associated with ports through which the terminal device receives a downlink reference signal, the The first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the associated port.

In a possible implementation manner, the communication module 601 is further configured to configure at least one SRS resource set for the terminal device, where the at least one SRS resource set is used for antenna selection. Wherein, the at least one SRS resource set includes q SRS resources, and each SRS resource in the q SRS resources includes m SRS ports, and the at least one SRS resource set includes n SRS ports in total, and n is a positive number greater than or equal to 1. Integer, m is a positive integer greater than or equal to 1 and less than or equal to n, q is a positive integer greater than or equal to 1; the first indication message includes first information, and the first information is used to indicate the first vector, the number of elements of the first vector Any of n elements, n-1 elements, m elements, or m-1 elements.

In a possible implementation manner, the communication module 601 is further configured to receive an SRS from a terminal device. Wherein, the SRS port for the terminal device to send the SRS is in one-to-one correspondence with the port for the terminal device to receive the downlink reference signal; based on the SRS and the first vector, downlink data is sent to the terminal device.

In a possible implementation, the processing module 602 is configured to obtain downlink channel information based on the SRS and the first vector; wherein the downlink channel information includes downlink channel information corresponding to multiple ports, and the downlink channel information corresponding to the multiple ports The amplitude ratio or energy ratio of is associated with the amplitude ratio or energy ratio indicated by the first vector; the access network device precodes the downlink data based on the downlink channel information. The communication module 601 is configured to send downlink data to the terminal device.

The downlink channel information H ^DL satisfies the following formula:

in,

The downlink channel information H ^DL satisfies the following formula:

in,

In a possible implementation manner, the communication module 601 is further configured to receive a second indication message from the terminal device, where the second indication message is used to indicate a second vector, and the elements in the second vector are the same as the elements used for antenna selection. SRS resources are associated; the second vector is used to indicate the power ratio or amplitude ratio of the SRS sent on the associated SRS resource; based on the SRS, the first vector and the second vector, downlink data is sent to the terminal device.

In a possible implementation, the processing module 602 is further configured to obtain downlink channel information based on the SRS, the first vector, and the second vector; wherein the downlink channel information includes downlink channel information corresponding to multiple ports, and the multiple ports The amplitude ratio or energy ratio of the corresponding downlink channel information is not only associated with the amplitude ratio or energy ratio indicated by the first vector, but also associated with the power ratio or amplitude ratio indicated by the second vector; based on the downlink channel information, the downlink data to pre-encode. Furthermore, the communication module 601 is also configured to send downlink data to the terminal device.

In a possible implementation manner, the second vector is [α ₀ ... α _l ... α _q-1 ], where α _l is related to the antenna selection sent by the terminal device on the lth SRS resource Corresponding to the power or amplitude of SRS, l=0,1,...,q-1

The downlink channel information H ^DL satisfies the following formula:

in,

For a more detailed description of the communication module 601 and the processing module 602, reference may be made to the relevant description of the access network device in the above method embodiment, and no further description is given here.

Alternatively, in another embodiment, the communication device shown in FIG. 6 may be used to implement some or all functions of the terminal device in the method embodiments described in FIG. 3 , FIG. 4 or FIG. 5 . The device may be a terminal device, or a device in the terminal device, or a device that can be matched with the terminal device. Wherein, the communication device may also be a system on a chip. The communication device shown in FIG. 6 may include a communication module 601 and a processing module 602, and the processing module 602 is used to process data communicated through the communication module 601, wherein:

The communication module 601 is configured to send a first indication message to the access network device, where the first indication message is used to indicate the first vector. The elements in the first vector are associated with the port on which the terminal device receives the downlink reference signal; the first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the associated port,

In a possible implementation manner, elements in the first vector correspond to ports through which the terminal device receives the downlink reference signal; the first vector is used to indicate an amplitude ratio or an energy ratio of the downlink reference signal received by each port.

In a possible implementation manner, the communication module 601 is further configured to receive configuration of at least one Sounding Reference Signal (SRS) resource set by the access network device, the at least one SRS resource set is used for antenna selection, and the at least one SRS resource set includes q SRS resources, each of the q SRS resources includes m SRS ports, the at least one SRS resource set includes n SRS ports in total, n is a positive integer greater than or equal to 1, and m is greater than or equal to 1 and less than or equal to n is a positive integer, q is a positive integer greater than or equal to 1; the first indication message includes first information, the first information is used to indicate the first vector, and the number of elements of the first vector is n, n-1, Any of m or m-1.

In a possible implementation manner, the communication module 601 is also used to send an SRS to the access network device, and the SRS port for the terminal device to send the SRS is in one-to-one correspondence with the port for the terminal device to receive the downlink reference signal; the terminal device receives the SRS from the access network The downlink data of the device.

In a possible implementation manner, the communication module 601 is further configured to send a second indication message to the access network device, where the second indication message is used to indicate a second vector, and the elements in the second vector are the same as the elements used for antenna selection. The SRS resource is associated; the second vector is used to indicate the power ratio or amplitude ratio of the SRS sent on the associated SRS resource; the terminal device receives downlink data from the access network device.

For a more detailed description of the communication module 601 and the processing module 602, reference may be made to the relevant description of the terminal device in the method embodiment above, and no further description is given here.

Please refer to FIG. 7 . FIG. 7 is a schematic structural diagram of a communication device 700 provided in the present application. The communication device 700 includes a processor 710 and an interface circuit 720 . The processor 710 and the interface circuit 720 are coupled to each other. It can be understood that the interface circuit 720 may be a transceiver or an input-output interface. Optionally, the communication device 700 may further include a memory 730 for storing instructions executed by the processor 710, or storing input data required by the processor 710 to execute the instructions, or storing data generated by the processor 710 after executing the instructions.

When the communication device 700 is used to implement the methods in the above method embodiments, the processor 710 is used to execute the functions of the processing module 602, and the interface circuit 720 is used to execute the functions of the communication module 601.

When the above communication device is a chip applied to access network equipment, the access network equipment chip implements the functions of the access network equipment in the above method embodiment, and the access network equipment chip receives information from other network elements; or, the access network equipment chip receives information from other network elements; The access network device chip sends information to other network elements.

When the above communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiment. The terminal equipment chip receives information from other network elements; or, the terminal equipment chip sends information to other network elements.

It can be understood that the processor in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. A general-purpose processor can be a microprocessor, or any conventional processor.

The method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by means of a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (random access memory, RAM), flash memory, read-only memory (Read-Only Memory, ROM), programmable read-only memory (programmable ROM) , PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically erasable programmable read-only memory (electrically EPROM, EEPROM), register, hard disk, mobile hard disk, CD-ROM or known in the art any other form of storage medium. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. The processor and storage medium can be located in the ASIC. In addition, the ASIC may be located in the access network device or the terminal device. Certainly, the processor and the storage medium may also exist in the access network device or the terminal device as discrete components.

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer programs or instructions. When the computer program or instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer program or instructions may be stored in or transmitted via a computer-readable storage medium. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server integrating one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a DVD; it may also be a semiconductor medium, such as a solid state disk (solid state disk, SSD).

In each embodiment of the present application, if there is no special explanation and logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical relationships can be combined to form new embodiments.

It can be understood that the various numbers involved in the embodiments of the present application are only for convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the serial numbers of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic.

The embodiment of the present application also provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed, the access network device or the terminal device in the above-mentioned method embodiments executes method is implemented.

The embodiment of the present application also provides a computer program product, the computer program product includes a computer program, and when the computer program is executed, the method performed by the access network device or the terminal device in the above method embodiment is realized.

An embodiment of the present application also provides a communication system, where the communication system includes an access network device or a terminal device. Wherein, the access network device is configured to execute the method performed by the access network device in the foregoing method embodiments. The terminal device is configured to execute the methods performed by the terminal device in the foregoing method embodiments.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Depending on the application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

The descriptions of the various embodiments provided in this application can refer to each other, and the descriptions of each embodiment have their own emphases. For the parts that are not described in detail in a certain embodiment, you can refer to the relevant descriptions of other embodiments. For the convenience and brevity of description, for example, regarding the functions of the devices and equipment and the executed steps provided by the embodiments of the present application, reference may be made to the relevant descriptions of the method embodiments of the present application. May be cross-referenced, combined or cited.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present application. scope.

Claims

A communication method, characterized in that the terminal device includes a plurality of ports, the method comprising:

The access network device receives a first indication message from the terminal device, where the first indication message indicates a first vector, and elements in the first vector are associated with ports through which the terminal device receives a downlink reference signal; the first vector A vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the associated port.
The method according to claim 1, wherein the elements in the first vector correspond to the ports on which the terminal equipment receives the downlink reference signal; the first vector is used to indicate the downlink reference signal received by each port Amplitude ratio or energy ratio of a signal.
The method according to claim 1 or 2, characterized in that the method further comprises:

The access network device configures at least one sounding reference signal SRS resource set for the terminal device, the at least one SRS resource set is used for antenna selection, the at least one SRS resource set includes q SRS resources, and the q Each SRS resource in the SRS resources includes m SRS ports, and the at least one SRS resource set includes n SRS ports in total, the n is a positive integer greater than or equal to 1, and the m is a positive integer greater than or equal to 1 and less than or equal to n Integer, said q is a positive integer greater than or equal to 1;

The first indication message includes first information, the first information is used to indicate the first vector, and the number of elements of the first vector is: n elements, n-1 elements, m elements or Any of m-1 elements.
The method according to claim 3, wherein the method further comprises:

The access network device receives the SRS from the terminal device, and the SRS port through which the terminal device sends the SRS is in one-to-one correspondence with the port through which the terminal device receives the downlink reference signal;

The access network device sends downlink data to the terminal device based on the SRS and the first vector.
The method according to claim 4, wherein the access network device sends downlink data to the terminal device based on the SRS and the first vector, comprising:

The access network device obtains downlink channel information based on the SRS and the first vector; wherein the downlink channel information includes downlink channel information corresponding to multiple ports, and the downlink channel information corresponding to the multiple ports an amplitude ratio or an energy ratio associated with the amplitude or energy ratio indicated by said first vector;

The access network device precodes downlink data based on the downlink channel information;

The access network device sends downlink data to the terminal device.
The method according to claim 5, wherein the first vector is [β 0 ... β i ... β n-1 ], the β i corresponds to the i-th port, and the i=0, 1 ,...,n-1;

The downlink channel information H DL satisfies the following formula:

Wherein, the H i UL is the uplink channel information corresponding to the i-th SRS port; when the first vector is used to indicate the energy ratio of the downlink reference signal received by each port, the λ i is
When the first vector is used to indicate the amplitude ratio of downlink reference signals received by each port, the λ i is β i .
The method according to any one of claim 5, wherein the first vector is [β km ... β km+j ... β (k+1)m-1 ... β km ... β km+j ... β (k+1)m-1 ], the β km+j corresponds to the km+jth port, the j=0,1,...,m-1, the k=0,1,..., q-1;

The downlink channel information H DL satisfies the following formula:

Wherein, the H j UL is the uplink channel information corresponding to the jth SRS port; when the first vector is used to indicate the energy ratio of the downlink reference signal received by each port, the λ j is
When the first vector is used to indicate the amplitude ratio of downlink reference signals received by each port, the λ j is β km+j .
The method according to claim 4, wherein the method further comprises:

The access network device receives a second indication message from the terminal device, where the second indication message is used to indicate a second vector, and elements in the second vector are associated with SRS resources used for antenna selection; The second vector is used to indicate a power ratio or an amplitude ratio of the SRS transmitted on the associated SRS resource;

The access network device sends downlink data to the terminal device based on the SRS and the first vector, including:

The access network device sends downlink data to the terminal device based on the SRS, the first vector, and the second vector.
The method according to claim 8, wherein the elements in the second vector correspond to the SRS resources used for antenna selection one-to-one; the second vector is used to indicate that on each SRS resource used for antenna selection The power ratio or amplitude ratio of the transmitted SRS.
The method according to claim 8 or 9, wherein the access network device sends downlink data to the terminal device based on the SRS, the first vector and the second vector, comprising:

The access network device obtains downlink channel information based on the SRS, the first vector, and the second vector; the downlink channel information includes downlink channel information corresponding to multiple ports, and the downlink channel information corresponding to the multiple ports The amplitude ratio or energy ratio of the downlink channel information is not only associated with the amplitude ratio or energy ratio indicated by the first vector, but also associated with the power ratio or amplitude ratio indicated by the second vector;

The access network device precodes downlink data based on the downlink channel information;

The access network device sends downlink data to the terminal device.
The method according to claim 10, wherein the second vector is [α 0 ... α l ... α q-1 ], wherein the α l is related to the antenna Corresponding to the power or amplitude of the selected SRS, the l=0, 1, ..., q-1;

The downlink channel information H DL satisfies the following formula:

Wherein, the H j UL is the uplink channel information corresponding to the jth SRS port; when the second vector is used to indicate the power ratio of the SRS sent by the terminal device on each SRS resource used for antenna selection , the η l is α l ; when the second vector is used to indicate the amplitude ratio of the SRS sent by the terminal device on each SRS resource used for antenna selection, the η l is
A communication method, characterized in that the method comprises:

The terminal device sends a first indication message to the access network device, where the first indication message indicates a first vector, and elements in the first vector are associated with ports on which the terminal device receives the downlink reference signal; the first The vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signal received by the associated port.
The method according to claim 12, wherein the elements in the first vector correspond one-to-one to the ports through which the terminal equipment receives the downlink reference signal; the first vector is used to indicate the downlink reference signal received by each port Amplitude ratio or energy ratio.
The method according to claim 12 or 13, wherein the method further comprises:

The terminal device receives at least one sounding reference signal SRS resource set from the access network device, the at least one SRS resource set is used for antenna selection, the at least one SRS resource set includes q SRS resources, and the q Each of the SRS resources includes m SRS ports, and the at least one SRS resource set includes n SRS ports in total, where n is a positive integer greater than or equal to 1, and m is greater than or equal to 1 and less than or equal to n A positive integer, the q is a positive integer greater than or equal to 1;

The first indication message includes first information, the first information is used to indicate the first vector, and the number of elements of the first vector is: n elements, n-1 elements, m elements or Any of m-1 elements.
The method according to claim 14, wherein the method further comprises:

The terminal device sends an SRS to the access network device, and the SRS port on which the terminal device sends the SRS is in one-to-one correspondence with the port on which the terminal device receives the downlink reference signal;

The terminal device receives downlink data from the access network device.
The method according to claim 14, wherein the method further comprises:

The terminal device sends a second indication message to the access network device, where the second indication message is used to indicate a second vector, and elements in the second vector are associated with SRS resources used for antenna selection; The second vector is used to indicate the power ratio or amplitude ratio of the SRS sent on the associated SRS resource;

The terminal device receives downlink data from the access network device.
The method according to claim 16, wherein the elements in the second vector correspond one-to-one to the SRS resources used for antenna selection; the second vector is used to indicate that on each SRS resource used for antenna selection The power ratio or amplitude ratio of the transmitted SRS.
A communication device, characterized by comprising a module for performing the method according to any one of claims 1-11; or comprising a module for performing the method according to any one of claims 12-17 .
A communication device, characterized in that it includes a processor and an interface circuit, the interface circuit is used to receive signals from other communication devices other than the communication device and transmit them to the processor or transmit signals from the processor The signal is sent to other communication devices other than the communication device, and the processor implements the method according to any one of claims 1-11 or 12-17 through a logic circuit or executing code instructions.
A computer-readable storage medium, characterized in that computer programs or instructions are stored in the storage medium, and when the computer programs or instructions are executed by a communication device, any one of claims 1-11 or 12-17 can be realized. one of the methods described.
A computer program product, characterized in that when the computer reads and executes the computer program product, the computer is made to perform the method described in any one of claims 1-11 or 12-17.