CN116437391A

CN116437391A - Communication method and communication device

Info

Publication number: CN116437391A
Application number: CN202111677004.XA
Authority: CN
Inventors: 蔡世杰; 张哲宁; 秦熠; 刘鹍鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2023-07-14
Also published as: WO2023125833A1

Abstract

The application provides a communication method and a communication device, wherein the communication method comprises the following steps: the access network device receives a first indication message from the terminal device, wherein the first indication message is used for indicating a first vector, elements in the first vector are associated with a port of the terminal device for 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 the communication method, the access network equipment can acquire the auxiliary information reflecting the downlink channel information of the downlink data received by the terminal equipment, and further, the downlink throughput can be improved by sending the downlink data according to the auxiliary information.

Description

Communication method and communication device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a communication method and a communication device.

Background

In a time division duplex (time division duplexing, TDD) system, there is typically an ideal diversity between an ideal uplink channel and an ideal downlink channel, and it is understood that the parameter values (e.g., amplitude and phase) of the ideal uplink channel are equal to the parameter values (e.g., amplitude and phase) of the ideal downlink channel. Therefore, after the base station performs ideal uplink channel estimation, the base station is equivalent to obtaining the ideal downlink channel based on the rational diversity of the ideal uplink and downlink channels.

In practical systems, however, the channel is determined by both the hardware on the terminal device side, the radio path between the terminal device and the access network device, and the hardware on the access network device side. Because of irregular antenna arrangement of the terminal equipment and different radio frequency paths of different transmitting antennas and receiving antennas, an actual uplink channel in a time division duplex (time division duplexing, TDD) system is influenced by uplink non-ideal factors, an actual downlink channel is influenced by downlink non-ideal factors, and therefore, no ideal dissimilarity exists between an actual uplink channel (an ideal uplink channel influenced by the uplink non-ideal factors) and an actual downlink channel (an ideal downlink channel influenced by the downlink non-ideal factors). Thus, the access network device cannot accurately perform downlink precoding according to the ideal reciprocity of the uplink and downlink channels, and downlink throughput is reduced. How to solve the downlink throughput degradation caused by non-ideal diversity is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a communication method and a communication device, by using the communication method, an access network device obtains auxiliary information (namely a first vector mentioned later) reflecting downlink channel information, and performs accurate downlink precoding according to the auxiliary information to send downlink data, so that downlink throughput is improved.

In a first aspect, an embodiment of the present application provides a communication method, in which an access network device receives a first indication message from a terminal device, where the first indication message is used to indicate a first vector, and an element in the first vector is associated with a port where the terminal device receives a downlink reference signal, and the first vector is used to indicate an amplitude ratio or an 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 acquire accurate downlink channel related information, and create conditions for improving downlink throughput.

In one possible implementation manner, the elements in the first vector are in one-to-one correspondence with ports of the terminal device for receiving the downlink reference signals; the first vector is used for indicating the amplitude ratio or the energy ratio of the downlink reference signals received by each port.

In one possible implementation, the access network device configures the terminal device with at least one set of sounding reference signal, SRS, resources that 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 altogether, 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, q is a positive integer greater than or equal to 1; the first indication message includes first information for indicating a first vector having any one of n elements, n-1 elements, m elements, or m-1 elements.

By implementing the possible implementation method, the data volume reported by the terminal equipment to the access network equipment can be saved, thereby saving communication transmission resources.

In one possible implementation, the access network device receives the SRS from the terminal device. The SRS ports of the terminal equipment for sending SRS are in one-to-one correspondence with ports of the terminal equipment for receiving downlink reference signals; and the access network equipment sends downlink data to the terminal equipment based on the SRS and the first vector.

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

In one possible implementation manner, the access network device obtains downlink channel information based on the SRS and the first vector; the downlink channel information comprises downlink channel information corresponding to a plurality of ports, and the amplitude ratio or the energy ratio of the downlink channel information corresponding to the ports is related to the amplitude ratio or the energy ratio indicated by the first vector; the access network equipment performs precoding on downlink data based on the downlink channel information; the access network device sends downlink data to the terminal device.

By implementing the possible implementation manner, the access network device can obtain more accurate downlink channel information by combining auxiliary information (amplitude ratio or energy ratio of downlink reference signals received by each port of the terminal device), and downlink throughput can be improved by performing downlink precoding according to the accurate downlink channel information.

In one possible embodiment, the first vector is [ beta ] ₀ … β _i … β _n-1 ]，β _i Corresponding to the i-th port, i=0, 1, …, n-1;

downlink channel information H ^DL The following formula is satisfied:

wherein H is _i ^UL Uplink channel information corresponding to the ith SRS port; lambda when the first vector is used for indicating the energy ratio of the downlink reference signals received by each port _i Is that

Lambda when the first vector is used for indicating the amplitude ratio of the downlink reference signals received by each port _i Beta is _i 。

In one possible embodiment, the first vector is [ beta ] _km … β _km+j … β _(k+1)m-1 … β _km … β _km+j … β _(k+1)m-1 ]，β _km+j Corresponding to the (km+j) th port, j=0, 1,..m-1, k=0, 1,..q-1;

downlink channel information H ^DL The following formula is satisfied:

wherein H is _j ^UL For the j-th SRSUplink channel information corresponding to the port; lambda when the first vector is used for indicating the energy ratio of the downlink reference signals received by each port _j Is that

Lambda when the first vector is used for indicating the amplitude ratio of the downlink reference signals received by each port _j Beta is _km+j 。

In one possible implementation, the access network device receives a second indication message from the terminal device, the second indication message being for indicating a second vector, an element in the second vector being associated with SRS resources for antenna selection; the second vector is to indicate a power ratio or an amplitude ratio of SRS transmitted on the associated SRS resource; and the access network equipment sends downlink data to the terminal equipment based on the SRS, the first vector and the second vector.

By implementing the possible implementation manner, when the terminal device sends the SRS for antenna selection and the power of each SRS sent is different, the access network device can combine the auxiliary information (the amplitude ratio or the energy ratio of the downlink reference signal received by each port of the terminal device) and the power of each SRS sent to perform accurate downlink precoding, so that the downlink throughput can be improved.

In one possible implementation, the elements in the second vector are in one-to-one correspondence with SRS resources for antenna selection; the second vector is used to indicate a power ratio or an amplitude ratio of SRS transmitted on each SRS resource for antenna selection.

In one possible implementation manner, the access network device obtains downlink channel information based on the SRS, the first vector and the second vector; the downlink channel information comprises downlink channel information corresponding to a plurality of ports, and the amplitude ratio or the energy ratio of the downlink channel information corresponding to the ports is associated with the amplitude ratio or the energy ratio indicated by the first vector and the power ratio or the amplitude ratio indicated by the second vector; the access network equipment performs precoding on downlink data based on the downlink channel information, and then sends the downlink data to the terminal equipment.

By implementing the possible implementation manner, when the terminal device sends the SRS for antenna selection and the power of each SRS sent is different, the access network device can combine the auxiliary information (the amplitude ratio or the energy ratio of the downlink reference signal received by each port of the terminal device) and the power of each SRS sent to obtain more accurate downlink channel information, and downlink precoding is performed according to the accurate downlink channel information, so that downlink throughput can be improved.

In one possible embodiment, the second vector is [ alpha ] ₀ … α _l … α _q-1 ]Wherein alpha is _l Corresponding to the power or amplitude of SRS transmitted by the terminal device on the first SRS resource for antenna selection, l=0, 1, …, q-1;

Downlink channel information H ^DL The following formula is satisfied:

wherein H is _j ^UL The uplink channel information corresponding to the j-th SRS port; η when the second vector is used to indicate the power ratio of the SRS transmitted by the terminal device on each SRS resource for antenna selection _l Alpha is alpha _l The method comprises the steps of carrying out a first treatment on the surface of the η when the second vector is used to indicate the amplitude ratio of the SRS transmitted by the terminal device on each SRS resource for antenna selection _l Is that

In a second aspect, an embodiment of the present application provides a communication method, in which a terminal device sends a first indication message to an access network device, where the first indication message indicates a first vector, and an element in the first vector is associated with a port where the terminal device receives a downlink reference signal; the first vector is used to indicate the amplitude ratio or energy ratio of the downstream reference signals received by the associated ports.

The advantages of the communication method according to the second aspect can be seen from the advantages of the communication method according to the first aspect, and will not be described in detail herein.

In one possible implementation method, a terminal device receives at least one sounding reference signal SRS resource set from an access network device, where the at least one SRS resource set is used for antenna selection, the at least one SRS resource set includes q SRS resources, each SRS resource includes m SRS ports, the at least one SRS resource set includes n SRS ports, 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; the first indication message includes first information for indicating a first vector having any one of n, n-1, m, or m-1 elements.

In one possible implementation method, a terminal device sends SRS to an access network device, and an SRS port of the terminal device sending the SRS corresponds to a port of the terminal device receiving a downlink reference signal one by one; the terminal device receives downlink data from the access network device.

In one 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 an element in the second vector is associated with SRS resources for antenna selection; the second vector is to indicate a power ratio or an amplitude ratio of SRS transmitted 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 communications apparatus, which may be an apparatus in an access network device, or an apparatus that is capable of being used in cooperation with an access network device. The communication device may also be a chip system. The communication device may perform the method of the first aspect. The functions of the communication device can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. The unit may be software and/or hardware. The operations and advantages performed by the communication device may be referred to the methods and advantages described in the first aspect, and the repetition is not repeated.

In a fourth aspect, the present application provides a communications apparatus, which may be an apparatus in a terminal device, or an apparatus that can be used in a matching manner with a terminal device. The communication device may also be a chip system. The communication device may perform the method of the second aspect. The functions of the communication device can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the functions described above. The unit may be software and/or hardware. The operations and advantages performed by the communication device may be referred to the methods and advantages described in the second aspect, and the repetition is omitted.

In a fifth aspect, the present application provides a communication apparatus, which may be an access network device in the foregoing method embodiment, or a chip disposed in the access network device. The communication device comprises a communication interface and a processor, and optionally a memory. The memory is used for storing a computer program or instructions, and the processor is coupled with the memory and the communication interface, and when the processor executes the computer program or instructions, the communication device executes the method executed by the access network device in the method embodiment.

In a sixth aspect, the present application provides a communication device, which may be a terminal device in the above method embodiment, or a chip provided in the terminal device. The communication device comprises a communication interface and a processor, and optionally a memory. The memory is used for storing a computer program or instructions, and the processor is coupled with the memory and the communication interface, when the processor executes the computer program or instructions, the communication device executes the method executed by the terminal device in the method embodiment.

In a seventh aspect, the present application provides a computer readable storage medium for storing computer executable instructions that, when executed, cause a method performed by an access network device in a method according to the first aspect to be implemented; alternatively, a method performed by the terminal device in the method as described in the second aspect is implemented.

In an eighth aspect, the present application provides a computer program product comprising a computer program which, when executed, causes a method performed by an access network device in a method according to the first aspect to be performed; alternatively, a method performed by the terminal device in the method as described in the second aspect is implemented.

In a ninth aspect, the present application provides a communication system comprising the communication apparatus of the third and fourth aspects; or includes the communication device of the fifth and sixth aspects.

Drawings

FIG. 1 is a schematic diagram of a system architecture provided herein;

fig. 2a is a schematic view of an antenna selection scenario provided in the present application;

fig. 2b is a schematic view of a non-antenna selection scenario provided in the present application;

FIG. 3 is a schematic flow chart of a communication method provided in the present application;

FIG. 4 is a flow chart of another communication method provided in the present application;

FIG. 5 is a flow chart of another communication method provided in the present application;

fig. 6 is a schematic structural diagram of a communication device provided in the present application;

fig. 7 is a schematic structural diagram of another communication device provided in the present application.

Detailed Description

Specific embodiments of the present application are described in further detail below with reference to the accompanying drawings.

The terms first and second and the like in the description, in the claims and in the drawings, are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the present application, "at least one (item)" means one or more, "a plurality" means two or more, and "at least two (items)" means two or three or more, and/or "for describing an association relationship of an association object, three kinds of relationships may exist, for example," a and/or B "may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

For a better understanding of the embodiments of the present application, the following first describes a system architecture related to the embodiments of the present application:

the technical solution of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (wideband code division multiple access, WCDMA) systems, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication systems, fifth generation (5th generation,5G) systems or new radio, NR) future communication systems, and the like.

Referring to fig. 1, fig. 1 is a schematic diagram of a system architecture according to 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 related to the system architecture in fig. 1 are described in detail below, respectively.

Terminal device 101, an entity on the user side for receiving or transmitting signals, comprising devices providing voice and/or data connectivity to the user, e.g. terminal device 101 is a device with wireless transceiver capabilities, which may be deployed on land, including indoor or outdoor, hand-held, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). The terminal device 101 may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in an industrial control (industrial control), a vehicle-mounted terminal device, a wireless terminal in a self driving (self driving), a wireless terminal in a remote medical (remote medical) device, a wireless terminal in a smart grid (smart grid), a wireless terminal in a transportation security (transportation safety), a wireless terminal in a smart city (smart city), a wireless terminal in a smart home (smart home), a wearable terminal device, or the like. The embodiments of the present application are not limited to application scenarios. A terminal device may also sometimes be referred to as a terminal, user Equipment (UE), access terminal device, vehicle terminal, industrial control terminal, UE unit, UE station, mobile station, remote terminal device, mobile device, UE terminal device, wireless communication device, UE agent, UE apparatus, or the like. The terminal may also be fixed or mobile.

An access network device (radio access network, RAN) 102 is a node or device that accesses a terminal device to a wireless network, the RAN 102 having a communication connection with the terminal device 101, it being understood that data transmission between the RAN 102 and the terminal device 101 may be performed over a Uu interface (or referred to as an air interface). Of course, in future communications, the names of these interfaces may be unchanged or may be replaced with other names, which are not limited in this application. The RAN may be any device with wireless transceiver capabilities including, but not limited to: an evolved node B (NodeB or eNB or e-NodeB, evolutional Node B) in LTE, a base station (gNodeB or gNB) in NR or a Transmission receiving point (Transmission ReceptionPoint, TRP), a base station for 3GPP subsequent evolution, an access node in a WiFi system, a wireless relay node, a wireless backhaul node, and the like. The base station may be: macro base station, micro base station, pico base station, small station, relay station, or balloon station, etc. Multiple base stations may support networks of the same technology as mentioned above, or may support networks of different technologies as mentioned above. A base station may contain one or more co-sited or non-co-sited TRPs. The RAN may also be a radio controller, a Centralized Unit (CU), and/or a Distributed Unit (DU) in the context of a cloud radio access network (Cloud Radio Access Network, CRAN). The RAN may also be a server, a wearable device, or an in-vehicle device, etc. The following description will take RAN as an example of a base station. The RANs may be the same type of base station or different types of base stations. The base station may communicate with the terminal device or may communicate with the terminal device through the relay station. The terminal device may communicate with a plurality of base stations of different technologies, for example, the terminal device may communicate with a base station supporting an LTE network, may communicate with a base station supporting a 5G network, and may support dual connectivity with the base station of the LTE network and the base station of the 5G network.

For a better understanding of the solutions provided in the present application, the following description refers to the relevant terms related to the embodiments of the present application:

1. reference Signal (RS)

An RS is a known signal provided by a transmitting end (e.g., a terminal device) to a receiving end (e.g., an access network device) for channel estimation or channel sounding. In a communication system, reference signals may 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; a channel state information-reference signal (CSI-RS) is a downlink reference signal transmitted by an access network device to a terminal device.

2. Uplink channel estimation

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

3. Antenna selection scenario and non-antenna selection scenario

Antenna selection scene: the access network device configures at least one SRS resource set for the terminal device for antenna selection. The at least one SRS resource set comprises q SRS resources, each SRS resource is used for transmitting an SRS selected by an antenna, each SRS resource comprises m SRS ports, the at least one SRS resource set comprises n SRS ports, 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, referring to fig. 2a, the access network device configures a set of SRS resources for the terminal device, where the set of SRS resources includes 2 SRS resources, each SRS resource includes 2 SRS ports, and the set of SRS resources includes 4 SRS ports in total.

A non-antenna selection scenario may be understood as a special presence of an antenna selection scenario, i.e. an antenna selection scenario where m is equal to n and q is 1. For example, referring to fig. 2b, the access network device configures a set of SRS resources for the terminal device, where the set of SRS resources includes 1 SRS resource, the SRS resource includes 4 SRS ports, and the set of SRS resources includes 4 SRS ports in total.

4. Uniform quantization and non-uniform quantization regions

Uniform quantization refers to quantization in which the range of values of the element to be quantized is equally divided. Non-uniform quantization refers to quantization in which the range of values of the element to be quantized is not divided at equal intervals. Illustratively, the range of values of the element to be quantized is (0, 1]Please refer to tables 1 and 2, wherein table 1 provides a way to uniformly quantize the element a to be quantized, and table 2 provides a way to non-uniformly quantize the element a, wherein the value of n is related to the quantization bit number B, satisfying the following requirements

When n=16, the true value of the element a to be quantized is +.>

At the time, the element A to be quantized is +.>

And the element A to be quantized is quantized according to Table 2 to +.>

TABLE 1

TABLE 2

5. Ideal reciprocity of uplink and downlink channels

TDD systems utilize the same frequency and different time slots for uplink and downlink signal transmission. In an ideal environment, the uplink and downlink fading can be considered to be substantially the same, regardless of the interference between the uplink and downlink, since the uplink and downlink are transmitted on the same frequency in a TDD system. In other words, the ideal reciprocity of the uplink and downlink channels means that the uplink channel information in the ideal environment (hereinafter also referred to as ideal uplink channel information) is the same as the downlink channel information in the 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 device in estimating the ideal downlink channel, that is, after the access network device obtains rational uplink channel information according to the SRS, the access network device obtains the ideal downlink channel information.

However, in the actual system, the channel is determined by the hardware at the terminal device side, the hardware at the access network device side, and the radio path between the terminal device and the access network device, and cannot be regarded as an ideal environment, that is, there is no ideal dissimilarity between the actual uplink channel (the ideal uplink channel affected by the uplink non-ideal factor) and the actual downlink channel (the ideal downlink channel affected by the downlink non-ideal factor) in the actual system. If the access network device obtains the actual uplink channel information (the ideal uplink channel information affected by the uplink non-ideal factor, hereinafter referred to as uplink channel information) from the SRS channel from the terminal device, it is inaccurate to make the actual uplink channel information equal to the actual downlink channel information (the ideal downlink channel information affected by the downlink non-ideal factor, hereinafter referred to as downlink channel information).

In the communication method provided by the application, the access network device of the application improves the downlink throughput by acquiring the auxiliary information (the auxiliary information capable of reflecting the downlink channel information, namely the first vector in the application) to assist in sending the downlink data. The communication method and the communication device provided by the application are further described below with reference to the accompanying drawings:

Referring to fig. 3, fig. 3 is a flow chart of a communication method according to an embodiment of the present application. As shown in fig. 3, the method execution body of the communication method may be an access network device or a chip in the access network device, or the execution body may be a terminal device or a chip in the terminal device. Fig. 3 illustrates an access network device and a terminal device as an execution body.

Wherein:

s301, the access network equipment receives a first indication message from the terminal equipment, wherein the first indication message is used for indicating a first vector.

The access network device sends a downlink reference signal (e.g., CSI-RS) to the terminal device. Further, the terminal device sends a 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 a port of the terminal device receiving the downlink reference signal, and the first vector is used for indicating the amplitude ratio or the energy ratio of the downlink reference signal received by the associated port.

In one possible implementation manner, the elements in the first vector are in one-to-one correspondence with the ports of the terminal device receiving the downlink reference signals, and the first vector is used for indicating the amplitude ratio or the energy ratio of the downlink reference signals received by each port.

It should be understood that the ports mentioned in the present application may be replaced by any one of a UE port, a UE antenna port, a UE physical antenna port, a UE virtual antenna port, a receiving port or a UE receiving port, and are mainly used for receiving the downlink reference signal by the terminal device. 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, medium access control (media access control, MAC) Control Element (CE) signaling, or uplink control information (uplink control information, UCI) signaling. The elements in the first vector are in one-to-one correspondence with the ports of the terminal device for receiving the downlink reference signal, which can be understood that the number of the elements in the first vector is the same as the number of the ports of the terminal device for receiving the downlink reference signal, and each element in the first vector is used for indicating the amplitude ratio or the 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 one embodiment, the vector described in each embodiment of the present invention may also be an array or a set, and the terminal or the access network device determines, according to a preset rule or a specific rule, the port corresponding to each numerical value in the array.

For ease of understanding, the manner in which the first indication message indicates the first vector, and the explanation of the first vector will be described below taking the first scenario as an example. In a first scenario, a terminal device includes n ports, n being a positive integer greater than or equal to 1; the access network device configures at least one SRS resource set for the terminal device, the at least one SRS resource set being used for antenna selection. The at least one SRS resource set comprises q SRS resources, each SRS resource comprises m SRS ports, the at least one SRS resource set comprises n SRS ports, m is a positive integer which is more than or equal to 1 and less than or equal to n, and q is a positive integer which is more than or equal to 1.

Example one: the first information in the first indication message is used to indicate a first vector, the first vector comprising n elements. It is understood that the number of elements of the first vector is n elements.

In this case, the first indication message includes first information for indicating 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 can directly obtain the first vector according to the first information. By the method, the step of processing the first information to obtain the first vector is reduced at the access network equipment side, and the operation complexity at the access network equipment side is reduced.

Specifically, the terminal device receives a downlink reference signal sent by the access network deviceAnd then, according to the energy (or amplitude) of the downlink reference signal received by each port and the first reference quantity, determining the value of the corresponding element of each port in the first vector. In one possibility, the terminal device sends the value of the corresponding element in the first vector (i.e. the first information) of each port to the access network device, and further, the access network device processes (e.g. combines) the values of the corresponding elements in the first vector according to each port to obtain the first vector. Alternatively, in another possibility, the terminal device processes (e.g. combines) the values of the corresponding elements in the first vector based on each port to obtain the first vector, and the terminal device sends the first vector (i.e. the first information) to the access network device. In this case, the first vector determined by the access network device from the first indication message may be denoted as [ beta ] ₀ … β _i … β _n-1 ]Wherein beta is _i I=0, 1, …, n-1 corresponding to the i-th port of the terminal device receiving the downlink reference signal.

The first reference amount may be the maximum value of the energy (or amplitude) of the downlink reference signal received by each port of the terminal device. Alternatively, the first reference amount is the minimum value of the energies (or magnitudes) of the downlink reference signals received by the respective ports of the terminal device. Alternatively, the first reference amount is the energy (or amplitude) of the downlink reference signal received by any port of the terminal device. Or the first reference quantity is a common divisor, a maximum common divisor or a preset value of energy (or amplitude) of the downlink reference signals received by each port of the terminal equipment. The preset value may be specified by a communication protocol between the terminal device and the access network device, or may be agreed upon by the access network device and the terminal device, which is not specifically illustrated herein. When the first reference quantity is a preset value, the preset value of the first reference quantity corresponding to the first vector when the first vector is used for indicating the amplitude ratio of the downlink reference signal received by each port and the preset value of the first reference quantity corresponding to the first vector when the first vector is used for indicating the energy ratio of the downlink reference signal received by each port may be the same or different, which is not particularly 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. Wherein the energy (or amplitude) of the downlink reference signal received by the port 0 is

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

The energy (or amplitude) of the downlink reference signal received by port 3 is 1. Further, the terminal device determines the values of the corresponding elements of the 4 ports in the first vector by taking the maximum value of the energy (or amplitude) of the downlink reference signal received by the 4 ports as a first reference, so as to obtain that the value of the corresponding element of the port 0 in the first vector is 1, and the value of the corresponding element of the 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 one example, the terminal device sends a first indication message carrying a first information to the access network device, the first information comprising the values 1,/v>

And->

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

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

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

In this case, the first indication message includes first information for indicating 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 can directly obtain the first vector according to the first information.

Specifically, after receiving the downlink reference signal from the access network device, the terminal device sends a first vector to the access network device according to the energy (or amplitude) of the downlink reference signal received by each of the n ports and the second reference quantity. 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; the first vector is used to indicate the amplitude ratio or the energy ratio of the downlink reference signals received by the other ports (i.e., the other ports of the n ports of the terminal device except the first reference port).

In another possible implementation, the first information in the first indication message is used to indicate a first vector, the first vector comprising n elements. It is understood that in this case the first vector comprises n elements and the first information is used to indicate n-1 elements in the first vector. Wherein, the first information is used for indicating n-1 elements, which can be understood that the first information is used for indicating the numerical values of n-1 elements in the first vector; alternatively, the first information is a vector including n-1 elements in the first vector.

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

Specifically, after the terminal device receives the downlink reference signal from the access network device, the value of the corresponding element of each port in the first vector is determined according to the energy (or amplitude) of the downlink reference signal received by each port and the second reference quantity. The second reference amount may be an energy or an 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, the access network device determines a third vector containing n-1 elements according to the first information, and inserts a value into the element position indicated by the index of the first reference port in the third vector to obtain the first vector, where in an embodiment, the inserted value may be 1. In this case, the first vector determined by the access network device from the first indication message may be denoted as [ beta ] ₀ … β _i … β _n-1 ]Wherein beta is _i I=0, 1, …, n-1 corresponding to the i-th port of the terminal device receiving the downlink reference signal.

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, where the first reference port is the port corresponding to the maximum 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 minimum value in the energy (or amplitude) of the downlink reference signal received by each port of the terminal equipment, and at this time, the first reference port is the port corresponding to the minimum value in the energy (or amplitude) of the downlink reference signal received by each port of the terminal equipment; or the second reference quantity is the energy (or amplitude) of the downlink reference signal received by any port of the terminal equipment, and the first reference port is the port corresponding to the second reference quantity. For ease of understanding, the following description will be made by taking the second reference amount as the maximum value of the energies (or amplitudes) of the downlink reference signals received by the ports of the terminal device, where the first reference port is the port corresponding to the maximum value of the energies (or amplitudes) of the downlink reference signals received by the ports of the terminal device.

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

The energy (or amplitude) of the downlink reference signal received by port 3 is 1. Further, the terminal device determines the values of the corresponding elements of the 4 ports in the first vector by taking the maximum value in the energy (or amplitude) of the downlink reference signals received by the 4 ports as a second reference, so as to obtain the value of the corresponding element of the port 0 in the first vector as 1, and the value of the corresponding element of the port 1 in the first vector as 1

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 one example, the terminal device sends a first indication message carrying a first information to the access network device, the first information comprising the value +.>

And->

The first information may be a vector. In another example, the terminal device sends a first indication message carrying a first information to the access network device, the first information being a third vector +. >

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

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

In one possible implementation, the first information in the first indication message is used to indicate a first vector, the first vector comprising m elements. It is 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 of the foregoing example one, and a detailed description is omitted 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 can directly obtain the first vector according to the first information.

Specifically, after receiving the downlink reference signal from the access network device, the terminal device determines, according to the energy (or amplitude) of the downlink reference signal received by the m ports and the third reference quantity, the values of corresponding elements of the m ports in the first vector, where SRS ports corresponding to the m ports belong to the same SRS resource. The terminal device sends first information to the access network device, wherein the first information is used for indicating the values of corresponding elements of the m ports in a first vector.

In another possible implementation, the first information in the first indication message is used to indicate a first vector, the first vector comprising n elements. It is understood that in this case the first vector comprises 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 of the foregoing example one, and a detailed description is omitted here. When m is greater than or equal to 1 and less than n and q is greater than 1, the access network device obtains m elements in the first vector through the first information, and then the access network device determines the first vector according to the m elements in the first vector. In one possible implementation, the access network device polls the m elements q times, and determines a result of the q times of polling as a first vector.

Specifically, after receiving the downlink reference signal from the access network device, the terminal device determines, according to the energy (or amplitude) of the downlink reference signal received by the m ports and the third reference quantity, the values of corresponding elements of the m ports in the first vector, where SRS ports corresponding to the m ports belong to the same SRS resource. The terminal device sends first information to the access network device, wherein the first information is used for indicating the values of corresponding elements of the m ports in a first vector. The access network equipment corresponds elements of the m ports in a first vectorQ polls, and the result of the q polls is determined as a first vector. In this case, the first vector determined by the access network device from the first indication message may be denoted as [ beta ] _km … β _km+j … β _(k+1)m-1 … β _km … β _km+j … β _(k+1)m-1 ]Wherein beta is _km+j Corresponding to the km+j th port of the terminal equipment 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 of the energy (or amplitude) of the downlink reference signals received by the m ports; or, the third reference quantity is the minimum value in the energy (or amplitude) of the downlink reference signals received by the m ports; 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 a common divisor, a maximum common divisor or a preset value of the energy (or amplitude) of the downlink reference signals received by the m ports. For ease of understanding, the following will exemplarily describe the third reference amount as the maximum value of the energies (or amplitudes) of the downlink reference signals received by the m ports.

Illustratively, n is 4, m is 2, and q is 2 in the first scenario. Namely, the access network equipment configures 2 SRS resources for the terminal equipment: a first SRS resource and a second SRS resource; the 4 ports of the terminal equipment are respectively: port 0, port 1, port 2 and port 3; the 4 SRS ports of the terminal equipment are respectively: SRS port 0, SRS port 1, SRS port 2 and SRS port 3. The corresponding relationship among each port of the terminal device, each SRS port, and each SRS resource may be referred to table 3.

TABLE 3 Table 3

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

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

In one example, the terminal device sends a first indication message carrying a first information to the access network device, the first information comprising the values 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, the first information being a vector indicating 2 elements of the first vector ∈>

The access network device polls 2 elements indicated by the first information for 2 times and determines the result of the 2 polls as a first vector +.>

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

In one possible implementation, the first information in the first indication message is used to indicate a first vector, the first vector comprising m-1 elements. It is 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 of the foregoing second example, and a detailed description is omitted herein. 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 can directly obtain the first vector according to the first information.

Specifically, after receiving the downlink reference signal from the access network device, the terminal device sends a first vector to 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. The fourth reference quantity is the energy or the 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 an amplitude ratio or an energy ratio for indicating downlink reference signals received by other ports (i.e., other ports except the second reference port among the m ports of the terminal device).

It is understood that the first vector comprises n elements and that the first information is used to indicate m-1 elements in the first vector. The first information is used to indicate m-1 elements in the first vector, which can be understood as the first information is used to indicate the values of m-1 elements in the first vector; alternatively, the first information is a vector including m-1 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 of the foregoing example two, and a detailed description is omitted here. When m is greater than or equal to 1 and less than n and q is greater than 1, the access network device obtains m-1 elements in the first vector through the first information, and then the access network device determines the first vector according to the m-1 elements in the first vector. In one possible implementation, the access network device obtains third information, where the third information 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 SRS ports corresponding to elements belonging to the same element group belong to the same SRS resource; further, the access network device determines the first vector according to the third information and m-1 elements in the first vector. It should be appreciated that the third information may be carried in the first indication message; or the third information can be carried in other messages reported by the terminal equipment; alternatively, the third information may be obtained according to a communication protocol. By such a method, the terminal device can reduce the amount of data reported to the access network device compared to the first, second and third examples, thereby saving communication transmission resources.

Specifically, after receiving the downlink reference signal from the access network device, the terminal device determines, according to the energy (or amplitude) of the downlink reference signal received by the m ports and the fourth reference quantity, the values of corresponding elements of the m ports in the first vector, where SRS ports corresponding to the m ports belong to the same SRS resource. The fourth reference quantity is the energy or the amplitude of the downlink reference signal received by the second reference port, 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, the access network device determines a fourth vector containing m-1 elements according to the first information, and inserts element 1 at the element position indicated by the index of the second reference port to obtain a fifth vector. Further, the access network device performs q polls on the elements in the fifth vector, and determines the q polls as a first vector. In this case, the first vector determined by the access network device from the first indication message may be denoted as [ beta ] _km … β _km+j … β _(k+1)m-1 … β _km … β _km+j … β _(k+1)m-1 ]Wherein beta is _km+j Km+j with terminal equipmentPorts receiving the downlink reference signals correspond to j=0, 1, …, m-1, k=0, 1, …, q-1.

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 port corresponding to the maximum value of the energy (or amplitude) of the downlink reference signals received by the m ports; 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 port corresponding to the minimum value in the energy (or amplitude) of the downlink reference signals received by the m ports; or the fourth reference quantity is the energy (or amplitude) of the downlink reference signal received by any one port of the m ports, and the second reference port is the port corresponding to the fourth reference quantity. For ease of understanding, the fourth reference amount is taken as the maximum value of the energies (or amplitudes) of the downlink reference signals received by the m ports, and the second reference port is taken as the port corresponding to the maximum value of the energies (or amplitudes) of the downlink reference signals received by the m ports, for exemplary illustration.

Illustratively, n is 4, m is 2, and q is 2 in the first scenario. Namely, the access network equipment configures 2 SRS resources for the terminal equipment: a first SRS resource and a second SRS resource; the 4 ports of the terminal equipment are respectively: port 0, port 1, port 2 and port 3; the 4 SRS ports of the terminal equipment are respectively: SRS port 0, SRS port 1, SRS port 2 and SRS port 3. The corresponding relationship among each port of the terminal device, each SRS port, and each SRS resource may be referred to in the foregoing table 3. After the terminal equipment receives the downlink reference signal sent by the access network equipment, the terminal equipment determines that the energy (or amplitude) of the downlink reference signal received by the port 0 is

The energy (or amplitude) of the downlink reference signal received by port 3 is 1. The terminal device determines energy (or amplitude) of a downlink reference signal received by a port (port 0 and port 1) corresponding to the first SRS resource to report to the access network device, further, the terminal device may determine the energy of the downlink reference signal received by the port 0 as a fourth reference amount, and determine, according to the fourth reference amount and the energy (or amplitude) of the downlink reference signal received by the port 1, values of corresponding elements of the port (port 0 and port 1) corresponding to the first SRS resource in a first vector, to obtain that the value of corresponding element of the port 0 in the first vector is 1, and the value of corresponding element of the port 1 in the first vector is->

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, the first information being a fourth vector +_ indicating 1 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 an element value of 1 in the element position indicated by the index of the second reference port in the fourth vector indicated by the first information, so as to obtain a fifth vector of +.>

Further, the access network device polls the elements in the fifth vector for 2 times, and determines the result of the 2 polls as +.>

It should be noted that, each element in the vectors (including the first vector, the second vector, the third vector, the fourth vector, the fifth vector, and the sixth vector) mentioned in the present application is obtained by uniform quantization or non-uniform quantization.

Referring to fig. 4, fig. 4 is a flow chart of a communication method according to an embodiment of the present application. As shown in fig. 4, the method execution body of the communication method may be an access network device or a chip in the access network device, or the execution body may be a terminal device or a chip in a terminal and a device. Fig. 4 illustrates an access network device and a terminal device as an execution body.

Wherein:

s401, the access network device receives a first indication message from the terminal device, where the first indication message is used to indicate a first vector.

The specific implementation manner of S401 may be referred to the description of the foregoing specific implementation manner of S301, and will not be repeated herein.

S402, the access network equipment receives SRS from the terminal equipment, wherein the SRS port of the terminal equipment for sending the SRS corresponds to the port of the terminal equipment for receiving the downlink reference signal one by one.

It should be noted that, the SRS ports of the terminal device are in one-to-one correspondence with the ports for receiving the downlink reference signals, which can be understood that the number of SRS ports of the terminal device is the same as the number of ports for receiving the downlink reference signals, and each SRS port corresponds to one port for receiving the downlink reference signals. For a group of corresponding SRS ports and a port for receiving downlink reference signals, the processing method for transmitting SRS by the terminal equipment through the SRS ports is the same as the processing method for receiving downlink reference signals by the terminal equipment through the ports. For example, the access network device configures 4 SRS ports for the terminal device, the terminal device has 4 ports for receiving the downlink reference signals, the SRS ports of the terminal device are in one-to-one correspondence with the ports for receiving the downlink reference signals, if the terminal device multiplies the downlink reference signals by a preprocessing matrix W with a dimension of 4*4 when receiving the downlink reference signals through the 4 ports for receiving the downlink reference signals, the terminal device multiplies the SRS by the same preprocessing matrix W when transmitting the SRS through the 4 SRS ports, 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 first scene, the terminal device comprises n ports, and 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, the at least one SRS resource set being used for antenna selection. The at least one SRS resource set comprises q SRS resources, each SRS resource comprises m SRS ports, the at least one SRS resource set comprises n SRS ports, the n SRS ports and the terminal equipment comprise n ports in one-to-one correspondence, m is a positive integer which is more than or equal to 1 and less than or equal to n, and q is a positive integer which is more than or equal to 1. When m is equal to n and q is 1, the first scene is a non-antenna selection scene; when m is greater than or equal to 1 and less than n and q is greater than 1, the first scene is an antenna selection scene.

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

And the access network equipment performs precoding on downlink data to be sent based on the SRS and the first vector, and sends the downlink data to the terminal equipment. Or the access network equipment determines a downlink precoding matrix based on the SRS and the first vector, and further performs precoding on downlink data to be sent based on the downlink precoding matrix, and sends the downlink data to the terminal equipment.

In one possible implementation manner, the access network device obtains downlink channel information based on the SRS and the first vector, where the downlink channel information includes downlink channel information corresponding to a plurality of ports, and an amplitude ratio or an energy ratio of the downlink channel information corresponding to the plurality of ports is associated with an amplitude ratio or an energy ratio indicated by the first vector. Further, the access network equipment performs precoding on downlink data based on the downlink channel information; the access network device sends the downlink data to the terminal device.

The downlink channel information including the downlink channel information corresponding to the plurality of ports can be understood as: the downlink channel information includes downlink channel information of all ports (i.e., n ports in the present application) where the terminal device receives the downlink reference signal. When a first vector is used to indicate the amplitude ratio or energy ratio of the downlink reference signals received by all ports (i.e., n ports), the downlink channel information of n ports in the downlink channel information is associated with n elements indicated by the first vector. When a first vector is used to indicate the amplitude ratio or energy ratio of a downlink reference signal received by a portion of the ports (i.e., one of n-1 ports, m ports, or m-1 ports), the downlink channel information of n-1 ports (or m ports, or m-1 ports) in the downlink channel information is associated with an n-1 element (or m elements, or m-1 elements) indicated by the first vector.

The amplitude ratio or the energy ratio of the downlink channel information corresponding to the plurality of ports in the downlink channel information is associated with the amplitude ratio or the energy ratio of the downlink reference signal received by each port indicated by the first vector, which can be understood as the amplitude ratio (or the energy ratio) of the downlink channel information corresponding to each port in the downlink channel information, which is the same as or approximately the same as (i.e. fluctuates within a certain allowed range) the amplitude ratio (or the energy ratio) of the downlink reference signal received by each port indicated by the first vector. That is, in the case where 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. In the case where 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 equipment carries out 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 following describes downlink channel information in conjunction with the four cases where the first indication message indicates the first vector in S301.

The first indication message at S301 indicates an indication of a first vectorIn the first and second embodiments, when the number of the first vectors is n elements, the first vector may be expressed as [ β ] ₀ … β _i … β _n-1 ]Wherein beta is _i Corresponding to the i-th port, i=0, 1, …, n-1. In this case, the downlink channel information H ^DL The following formula (1) is satisfied.

Wherein H is _i ^UL And the ith SRS port corresponds to the ith port for receiving the downlink reference signal. The lambda is used to indicate the energy ratio of the downlink reference signals received by each port when the first vector _i Is that

The lambda is used to indicate the amplitude ratio of the downstream reference signals received by each port when the first vector _i Beta is _i . The H is _i ^UL May be a numerical element, a vector or a matrix.

In the scenario where the first indication message of 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 may be expressed as [ β _km … β _km+j … β _(k+1)m-1 … β _km … β _km+j … β _(k+1)m-1 ]Wherein beta is _km+j Corresponding to the km+j ports, j=0, 1,..m-1, k=0, 1,..q-1. In this case, the downlink channel information H ^DL The following formula (2) is satisfied.

Wherein H is _j ^UL The uplink channel information corresponding to the j-th SRS port; indicating downstream received at each port on a first vectorLambda is the energy ratio of the reference signal _j Is that

Lambda when the first vector is used for indicating the amplitude ratio of the downlink reference signals received by each port _j Beta is _km+j . The H is _j ^UL May be a numerical element, a vector or a matrix.

It should be understood that, the downlink channel information mentioned in the present application is downlink channel information carried on one or more subcarriers, and the downlink reference signal mentioned in the present application is downlink reference signal carried on one or more subcarriers, where not specifically stated, the whole text is.

As can be seen, by the communication method provided in fig. 4, the access network device can improve the accuracy of downlink precoding according to the auxiliary information (the energy ratio or the amplitude ratio of the downlink reference signals received by each port of the terminal device), and further can improve the downlink throughput.

In one possible scenario, the hardware-borne non-idealities do not change over a certain time frame, i.e., the hardware-borne non-idealities have long-term stability. In this scenario, the access network device may send downlink data to the terminal device according to the same first vector within a certain time range, so as to reduce the number of times the terminal device reports the first vector, reduce the data volume reported by the terminal device, and further save transmission resources.

In other words, the access network device receives a first indication message from the terminal device at a first time, the first indication message being for indicating the first vector. At a second moment, the access network device sends downlink data to the terminal device based on the first vector. The second time is any time after the first time, and the time length between the second time and the first time is less than the first time length threshold. It should be noted that, the first time length threshold may be adjusted correspondingly according to a specific application scenario, so the value of the first time length threshold is not specifically limited herein; here, "time" is a broad concept, and one "time" may include S401 and S402 in fig. 4, and may also include S401, S402, and S403 in fig. 4.

Specifically, the access network device receives a first indication message and an SRS from the terminal device at a first time, and performs uplink channel estimation based on the SRS to obtain uplink channel information at the first time, where the first indication message is used to indicate a first vector. And at the second moment, the access network equipment receives the SRS from the terminal equipment and carries out uplink channel estimation based on the SRS to obtain uplink channel information at the second moment. Further, the access network device obtains 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 downlink data to the terminal device based on the downlink channel information.

The following describes downlink channel information in this scenario with reference to the four cases where the first indication message indicates the first vector in S301, taking the first time as the T time, the second time as the t+s time, and the first time length threshold as T as an example, where s=0, 1, …, and T.

In the case one and two of the cases where the first indication message of S301 indicates the first vector, when the number of the first vector is n elements, the first vector at the time t may be expressed as

Wherein (1)>

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

The following formula (3) is satisfied.

Wherein, the liquid crystal display device comprises a liquid crystal display device,

for the uplink channel information corresponding to the ith SRS port at the time t, the (I) is added>

And the ith SRS port corresponds to the ith port for receiving the downlink reference signal, and is the uplink channel information corresponding to the ith SRS port at the time t+s. The +.>

Is->

The +.>

Is->

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 the time t may be expressed as

Wherein (1)>

Corresponding to the km+j th port, j=0, 1, …, m-1, k=0, 1, …, q-1. In this case, downstream channel information at time t+s +.>

The following formula (4) is satisfied. />

for the uplink channel information corresponding to the jth SRS port at the t moment,/for the jth SRS port>

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

Is->

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

Is->

In the antenna selection scenario, since the power (or called energy) or the amplitude of the SRS for antenna selection is not necessarily identical every time the terminal device transmits, how the access network device performs accurate downlink precoding to improve the downlink throughput is a problem to be solved in this scenario. The foregoing first scenario is exemplified as an antenna selection scenario, in which case: the terminal equipment comprises n ports, wherein 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, the at least one SRS resource set being used for antenna selection. The at least one SRS resource set comprises q SRS resources, each SRS resource comprises m SRS ports, the at least one SRS resource set comprises n SRS ports, the n SRS ports and the terminal equipment comprise n ports in 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 scenario, please refer to fig. 5, fig. 5 is a schematic flow chart of a communication method according to an embodiment of the present application. As shown in fig. 5, the method execution body of the communication method may be an access network device or a chip in the access network device, or the execution body may be a terminal device or a chip in the terminal and the device. Fig. 5 illustrates an access network device and a terminal device as an execution body. Wherein:

s501, the access network device receives a first indication message from the terminal device, where the first indication message is used to indicate the first vector. The elements in the first vector are in one-to-one correspondence with the ports of the terminal equipment receiving the downlink reference signals, and the first vector is used for indicating the amplitude ratio or the energy ratio of the downlink reference signals received by each port.

The specific implementation manner of S501 may be referred to the description of the specific implementation manner of S301 or S401, and will not be described herein.

S502, the access network equipment receives SRS from the terminal equipment, wherein the SRS port of the terminal equipment for sending the SRS corresponds to the port of the terminal equipment for receiving the downlink reference signal one by one.

The specific implementation manner of S502 may be referred to the description of the specific implementation manner of S402, and will not be described herein.

S503, the access network device receives a second indication message from the terminal device, wherein the second indication message is used for indicating a second vector, and the second vector is used for indicating a power ratio or an amplitude ratio of SRS sent by the terminal device on each SRS resource for antenna selection.

The SRS power ratio (or amplitude ratio) may be understood as a 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 SRS on q SRS resources for antenna selection, sends a second indication message for indicating the second vector to the access network device. Wherein elements in the second vector are associated with SRS resources for antenna selection, the second vector being used to indicate a power ratio or an amplitude ratio of SRS transmitted on the associated SRS resources.

In one possible implementation, the elements in the second vector are in one-to-one correspondence with SRS resources for antenna selection, and the second vector is used to indicate an amplitude ratio or an energy ratio transmitted on each SRS resource for antenna selection. It can be understood that if the access network device configures q SRS resources for antenna selection for the terminal device, 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 explanation of the second vector will be described below taking the foregoing antenna selection scenario as an example.

Mode one: the fourth information in the second indication message indicates q elements of the second vector. It is 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 for indicating 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 can directly obtain the second vector according to the fourth information. By the method, the step of processing the fourth information to obtain the second vector is reduced at the access network equipment side, and the operation complexity at the access network equipment side is reduced.

Specifically, after the terminal device transmits SRS on q SRS resources for antenna selection, according to the power (or amplitude) of the SRS transmitted on each SRS resource for antenna selection and the fifth reference amount, determining a value of a corresponding element of each SRS resource for antenna selection in the second vector. In one possibility, the terminal device directly sends the value (i.e. the fourth information) of the corresponding element in the second vector of each SRS resource for antenna selection to the access network device, and further, the access network device corresponds to the element in the second vector according to each SRS resource for antenna selection Is processed (e.g., combined) to obtain a second vector. Alternatively, in another possibility, the terminal device processes (e.g. combines) the values of the corresponding elements in the second vector based on each SRS resource for antenna selection, and further, the terminal device sends the second vector (i.e. the fourth information) to the access network device. In this case, the second vector determined by the access network device from the second indication message may be denoted as [ alpha ] ₀ … α _l … α _q-1 ]Wherein alpha is _l Corresponding to the power or amplitude of the SRS transmitted by the terminal device on the first SRS resource for antenna selection, l=0, 1, …, q-1.

The fifth reference amount may be a maximum value of power (or amplitude) of the q SRS transmitted on the SRS resources for antenna selection. Alternatively, the fifth reference amount may be a minimum value of the power (or amplitude) of the q SRS transmitted on the SRS resources for antenna selection. Alternatively, the fifth reference amount may be the power (or amplitude) of SRS transmitted on any one of the q SRS resources for antenna selection. Alternatively, the fifth reference amount may be a common divisor, a greatest common divisor, or a preset value of the power (or amplitude) of the q SRS transmitted on the SRS resources for antenna selection. The preset value may be specified by a communication protocol between the terminal device and the access network device, or may be agreed upon by the access network device and the terminal device, which is not specifically illustrated herein. When the second vector is used to indicate the power of the SRS transmitted on each SRS resource for antenna selection, the preset value of the corresponding fifth reference may be the same or different from the preset value of the corresponding fifth reference when the second vector is used to indicate the amplitude ratio of the SRS transmitted on each SRS resource for antenna selection, which is not particularly limited in this application.

For example, in an antenna selection scenario, one set of resources configured by the access network device for terminal device for antenna selection includes 3 SRS resources: SRS resource 0, SRS resource 1 and SRS resource 2, wherein the power (or amplitude) of the SRS transmitted by the terminal equipment on SRS resource 0 is 2, and the terminal equipment on SRS resource 1The power (or amplitude) of the transmitted SRS is 4, and the power (or amplitude) of the SRS transmitted by the terminal device on the SRS resource 2 is

Further, the terminal device determines the values of the corresponding elements of the 3 SRS resources in the second vector by taking the maximum value of the power (or amplitude) of the SRS transmitted on the 3 SRS resources as a fifth reference amount, so as to obtain that the value of the corresponding element of the SRS resource 0 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 one example, the terminal device sends a second indication message carrying fourth information to the access network device, the fourth information comprising the 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, the fourth information being a second vector +.>

Mode two: the fourth information in the second indication message indicates q-1 elements in the second vector.

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

In this case, the second indication message includes fourth information for indicating 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 can directly obtain the second vector according to the fourth information.

Specifically, after the terminal device transmits SRS on q SRS resources for antenna selection, the terminal device transmits a second vector to the access network device according to the power (or amplitude) of the SRS transmitted on each SRS resource for antenna selection and the sixth reference amount. Wherein the sixth reference amount 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 for antenna selection; the second vector is used to indicate a power ratio or an amplitude ratio of the SRS transmitted on other SRS resources (i.e., other SRS resources than the first reference SRS resource among the q SRS resources for antenna selection).

In another possible implementation, the fourth information in the second indication message is used to indicate a second vector, the second vector comprising q elements. It is understood that in the case that the second vector comprises 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 q-1 elements in the second vector, which can be understood as the fourth information is used to indicate the values of q-1 elements in the second vector; alternatively, the fourth information is a vector including q-1 elements in the second vector.

In this case, after the access network device obtains 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 acquires fifth information, where 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 determines a second vector according to the fifth information and q-1 elements in the second vector. It should be appreciated that the fifth information may be carried in the second indication message; or the fifth information can be carried in other messages reported by the terminal equipment; alternatively, the fifth information may be obtained according to a communication protocol. By means of the method, compared with the mode one, the terminal equipment can reduce the data quantity reported to the access network equipment, and therefore communication transmission resources are saved.

Specifically, after the terminal device transmits SRS on q SRS resources for antenna selection, according to the power (or amplitude) of the SRS transmitted on each SRS resource for antenna selection and the sixth reference amount, determining a value of a corresponding element of each SRS resource for antenna selection in the second vector. The sixth reference amount is the power (or amplitude) of the SRS transmitted on the first reference SRS resource, the first reference SRS resource is any one of the q SRS resources for antenna selection, and the fifth information is an index of the first reference SRS resource. Further, the terminal device sends fourth information and fifth information to the access network device, the access network device determines a sixth vector containing q-1 elements according to the fourth information, and inserts an element value 1 at an element position indicated by an index of the first reference SRS resource in the sixth vector to obtain a second vector. In this case, the second vector determined by the access network device from the second indication message may be denoted as [ alpha ] ₀ … α _l … α _q-1 ]Wherein alpha is _l Corresponding to the power or amplitude of the SRS transmitted by the terminal device on the first SRS resource for antenna selection, l=0, 1, …, q-1.

The sixth reference amount may be the maximum value of the power (or amplitude) of the SRS transmitted on the q SRS resources for antenna selection, where the first reference SRS resource is an SRS resource corresponding to the maximum value of the power (or amplitude) of the SRS transmitted on the q SRS resources for antenna selection; alternatively, the sixth reference amount may be a minimum value of power (or amplitude) of the SRS transmitted on the q SRS resources for antenna selection, where the first reference SRS resource is an SRS resource corresponding to the minimum value of power (or amplitude) of the SRS transmitted on the q SRS resources for antenna selection; alternatively, the sixth reference amount may be the power (or amplitude) of the SRS transmitted on any one of the q SRS resources for antenna selection, where the first reference SRS resource is the SRS resource corresponding to the sixth reference amount. For ease of understanding, the following will exemplarily describe the case where the sixth reference amount is the maximum value of the power (or amplitude) of the SRS transmitted on the q SRS resources for antenna selection, and the first reference SRS resource is the SRS resource corresponding to the maximum value of the power (or amplitude) of the SRS transmitted on the q SRS resources for antenna selection.

Illustratively, in the antenna selection scenario, one set of resources configured by the access network device for terminal device for antenna selection includes 3 SRS resources: SRS resource 0, SRS resource 1 and SRS resource 2, the power (or amplitude) of the SRS transmitted by the terminal equipment on SRS resource 0 is 2, the power (or amplitude) of the SRS transmitted by the terminal equipment on SRS resource 1 is 4, and the power (or amplitude) of the SRS transmitted by the terminal equipment on SRS resource 2 is

Further, the terminal device determines the values of the corresponding elements of the 3 SRS resources in the second vector by taking the maximum value of the power (or amplitude) of the SRS transmitted on the 3 SRS resources as a sixth reference amount, so as to obtain that the value of the corresponding element of the SRS resource 0 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, the fourth information being a sixth vector +. >

Access networkThe device receives fifth information from the terminal device, where the fifth information is index 1 corresponding to SRS resource 1 (first reference SRS resource). Further, the access network device inserts an element value 1 in the element position indicated by the index of the first reference SRS resource in a sixth vector indicated by the fourth information, so as to obtain a second vector of +.>

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

And the access network equipment performs precoding on downlink data to be transmitted based on the SRS, the first vector and the second vector, and transmits the downlink data to the terminal equipment. Or the access network equipment determines a downlink precoding matrix based on the SRS, the first vector and the second vector, and further performs precoding on downlink data to be sent based on the downlink precoding matrix, and sends the downlink data to the terminal equipment.

In one possible implementation, 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 a plurality of ports, where the amplitude ratio or the energy ratio of the downlink channel information corresponding to the plurality of ports is associated with the amplitude ratio or the energy ratio of the downlink reference signal received by each port indicated by the first vector, and is also associated with the power ratio or the amplitude ratio of the SRS transmitted by the terminal device indicated by the second vector on each SRS resource used for antenna selection. Further, the access network equipment performs precoding on downlink data based on the downlink channel information; the access network device sends the downlink data to the terminal device. Illustratively, in the antenna selection scenario described above, the first vector may represent [ beta ] _km … β _km+j … β _(k+1)m-1 … β _km … β _km+j … β _(k+1)m-1 ]Wherein beta is _km+j Corresponding to the km+j th port, j=0, 1, …, m-1, k=0, 1, …, q-1. The second vector may be expressed as [ alpha ] ₀ … α _l … α _q-1 ]Wherein alpha is _l And alpha is _l Corresponding to the power or amplitude of the SRS transmitted by the terminal device on the first SRS resource for antenna selection, l=0, 1, …, q-1. In this case, the downlink channel information H ^DL The following formula (5) is satisfied.

Wherein H is _j ^UL The uplink channel information corresponding to the j-th SRS port; lambda when the first vector is used for indicating the energy ratio of the downlink reference signals received by each port _j Is that

Lambda when the first vector is used for indicating the amplitude ratio of the downlink reference signals received by each port _j Beta is _km+j . η when the second vector is used to indicate the power ratio of the SRS transmitted by the terminal device on each SRS resource for antenna selection _l Alpha is alpha _l The method comprises the steps of carrying out a first treatment on the surface of the η when the second vector is used to indicate the amplitude ratio of the SRS transmitted by the terminal device on each SRS resource for antenna selection _l Is->

The H is _j ^UL May be a numerical element, a vector or a matrix. />

By the communication method provided in fig. 5, in the scenario of antenna selection, 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 power ratio or amplitude ratio of the SRS transmitted by the terminal device on each SRS resource for antenna selection), the access network device can further improve the accuracy of downlink precoding compared with the communication method provided in fig. 4, and further can improve 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 apparatus shown in fig. 6 may be used to implement part or all of the functions of the access network device in the embodiment corresponding to the above-mentioned communication method, or the communication apparatus shown in fig. 6 may be used to implement part or all of the functions of the terminal device in the embodiment corresponding to the above-mentioned communication method.

In one embodiment, the communication apparatus shown in fig. 6 may be used to implement some or all of the functions of the access network device in the method embodiments described in fig. 3, fig. 4, or fig. 5; the device can be access network equipment, a device in the access network equipment or a device which can be matched with the access network equipment for use. The communication device may also be a chip system. The communication apparatus shown in fig. 6 may include a communication module 601 and a processing module 602, the processing module 602 for processing data communicated through the communication module 601, wherein:

a communication module 601, configured to receive a first indication message from a terminal device, where the first indication message is used to indicate a first vector, and an element in the first vector is associated with a port where the terminal device receives a downlink reference signal, and the first vector is used to indicate an amplitude ratio or an 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 of sounding reference signals to the terminal device, where the at least one SRS resource set is used for antenna selection. The at least one SRS resource set comprises q SRS resources, each SRS resource in the q SRS resources comprises m SRS ports, the at least one SRS resource set comprises n SRS ports, 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; the first indication message includes first information for indicating a first vector having any one 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. The SRS ports of the terminal equipment for sending SRS are in one-to-one correspondence with ports of the terminal equipment for receiving downlink reference signals; and sending downlink data to the terminal equipment based on the SRS and the first vector.

In a possible implementation manner, the processing module 602 is configured to obtain downlink channel information based on the SRS and the first vector; the downlink channel information comprises downlink channel information corresponding to a plurality of ports, and the amplitude ratio or the energy ratio of the downlink channel information corresponding to the ports is related to the amplitude ratio or the energy ratio indicated by the first vector; the access network device performs precoding on downlink data based on the downlink channel information. A communication module 601, configured to send downlink data to a terminal device.

downlink channel information H ^DL The following formula is satisfied:

In one possible embodiment, the first vector is [ beta ] _km … β _km+j … β _(k+1)m-1 … β _km … β _km+j … β _(k+1)m-1 ]，β _km+j Corresponding to the km+j th port, j=0, 1, …, m-1, k=0, 1, …, q-1;

downlink channel information H ^DL The following formula is satisfied:

Lambda when the first vector is used for indicating the amplitude ratio of the downlink reference signals received by each port _j Beta is _km+j 。/>

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 an element in the second vector is associated with SRS resources used for antenna selection; the second vector is to indicate a power ratio or an amplitude ratio of SRS transmitted on the associated SRS resource; and transmitting downlink data to the terminal equipment based on the SRS, the first vector and the second vector.

In a possible implementation manner, the processing module 602 is further configured to obtain downlink channel information based on the SRS, the first vector, and the second vector; the downlink channel information comprises downlink channel information corresponding to a plurality of ports, and the amplitude ratio or the energy ratio of the downlink channel information corresponding to the ports is associated with the amplitude ratio or the energy ratio indicated by the first vector and the power ratio or the amplitude ratio indicated by the second vector; and precoding downlink data based on the downlink channel information. Further, the communication module 601 is further configured to send downlink data to the terminal device.

In one possible implementationIn this way, the second vector is [ alpha ] ₀ … α _l … α _q-1 ]Wherein alpha is _l Corresponding to the power or amplitude of SRS transmitted by the terminal device on the first SRS resource for antenna selection, l=0, 1, …, q-1;

downlink channel information H ^DL The following formula is satisfied:

For a more detailed description of the communication module 601 and the processing module 602, reference may be made to the related description of the access network device in the above method embodiment, which is not described here.

Alternatively, in another embodiment, the communications apparatus shown in fig. 6 may be configured to implement some or all of the functions of the terminal device in the method embodiments described above in fig. 3, 4, or 5. The device can be a terminal device, a device in the terminal device or a device which can be matched with the terminal device for use. The communication device may also be a chip system. The communication apparatus shown in fig. 6 may include a communication module 601 and a processing module 602, the processing module 602 for processing 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 a port at which the terminal device receives the downlink reference signal; the first vector is used to indicate the amplitude ratio or energy ratio of the downstream reference signals received by the associated ports,

in one possible implementation manner, the elements in the first vector are in one-to-one correspondence with ports of the terminal device for receiving the downlink reference signals; the first vector is used to indicate the amplitude ratio or the energy ratio of the downlink reference signals received by the respective ports.

In a possible implementation manner, the communication module 601 is further configured to receive a configuration of at least one sounding reference signal SRS resource set by the access network device, where the at least one SRS resource set is used for antenna selection, the at least one SRS resource set includes q SRS resources, each SRS resource in the q SRS resources includes m SRS ports, where the at least one SRS resource set includes n SRS ports, 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; the first indication message includes first information for indicating a first vector having any one of n, n-1, m, or m-1 elements.

In a possible implementation manner, the communication module 601 is further configured to send an SRS to the access network device, where an SRS port for the terminal device to send the SRS corresponds to a port for the terminal device to receive the downlink reference signal one to one; the terminal device receives downlink data from the access network 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 an element in the second vector is associated with SRS resources used for antenna selection; the second vector is to indicate a power ratio or an amplitude ratio of SRS transmitted 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 description of the terminal device in the above method embodiment, which is not described here.

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

When the communication device 700 is used to implement the method in the above-described method embodiment, the processor 710 is configured to perform the functions of the above-described processing module 602, and the interface circuit 720 is configured to perform the functions of the above-described communication module 601.

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

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

It is to be appreciated that the processor in embodiments of the present application may be a central processing unit (central processing unit, CPU), but may also be other general purpose processors, digital signal processors (digital signal processor, DSP), application specific integrated circuits (application specific integrated circuit, ASIC), field programmable gate arrays (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.

The method steps in the embodiments of the present application may be implemented by hardware, or may be implemented by a processor executing software instructions. The software instructions may be comprised of corresponding software modules that may be stored in random access Memory (random access Memory, RAM), flash Memory, read-Only Memory (ROM), programmable ROM (PROM), erasable Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in an access network device or a terminal device. The processor and the storage medium may reside as discrete components in an access network device or terminal device.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer program or instructions may be stored in or transmitted across 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 that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; but also optical media such as DVD; but also semiconductor media such as Solid State Disks (SSDs).

In the various embodiments of the application, if there is no specific description or logical conflict, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments according to their inherent logical relationships.

It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application. The sequence number of each process does not mean the sequence of the execution sequence, and the execution sequence of each process should be determined according to the function and the internal logic.

The embodiment of the application also provides a computer readable storage medium, in which computer executable instructions are stored, which when executed, cause the method executed by the access network device or the terminal device in the above method embodiment to be implemented.

The embodiments of the present application also provide a computer program product, which comprises a computer program, which when executed causes the method performed by the access network device or the terminal device in the above-mentioned method embodiments to be implemented.

The embodiment of the application also provides a communication system, which comprises access network equipment or terminal equipment. The access network device is configured to execute the method executed by the access network device in the method embodiment. The terminal device is configured to execute the method executed by the terminal device in the method embodiment.

It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.

The descriptions of the embodiments provided in the present application may be referred to each other, and the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments. For convenience and brevity of description, for example, reference may be made to the relevant descriptions of the method embodiments of the present application with respect to the functions and execution steps of the apparatus, devices, and methods provided in the embodiments of the present application, and reference may also be made to each other, combined, or cited between the method embodiments, and between the apparatus embodiments.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of communication, wherein a terminal device comprises a plurality of ports, the method comprising:

the method comprises the steps that an access network device receives a first indication message from a terminal device, wherein the first indication message indicates a first vector, and elements in the first vector are associated with a port of the terminal device for receiving a downlink reference signal; the first vector is used to indicate an amplitude ratio or an energy ratio of the downstream reference signals received by the associated ports.

2. The method of claim 1, wherein the elements in the first vector are in one-to-one correspondence with ports of the terminal device that receive downlink reference signals; the first vector is used for indicating the amplitude ratio or the energy ratio of the downlink reference signals received by each port.

3. The method according to claim 1 or 2, characterized in that the method further comprises:

the access network equipment configures at least one Sounding Reference Signal (SRS) resource set to the terminal equipment, wherein the at least one SRS resource set is used for antenna selection, the at least one SRS resource set comprises q SRS resources, each SRS resource in the q SRS resources comprises m SRS ports, the at least one SRS resource set comprises 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;

The first indication message includes first information, where 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.

4. A method according to claim 3, wherein the method further comprises:

the access network equipment receives SRS from the terminal equipment, and the SRS port of the terminal equipment for sending the SRS corresponds to the port of the terminal equipment for receiving the downlink reference signal one by one;

and the access network equipment sends downlink data to the terminal equipment based on the SRS and the first vector.

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

the access network equipment obtains downlink channel information based on the SRS and the first vector; the downlink channel information comprises downlink channel information corresponding to a plurality of ports, and the amplitude ratio or the energy ratio of the downlink channel information corresponding to the ports is related to the amplitude ratio or the energy ratio indicated by the first vector;

The access network equipment performs precoding on downlink data based on the downlink channel information;

and the access network equipment sends downlink data to the terminal equipment.

6. The method according to claim 5, characterized in thatThe first vector is [ beta ] ₀ …β _i …β _n-1 ]Said beta _i Corresponding to the i-th port, the i=0, 1, …, n-1;

the downlink channel information H ^DL The following formula is satisfied:

wherein the H is _i ^UL Uplink channel information corresponding to the ith SRS port; the lambda is used to indicate the energy ratio of the downlink reference signals received by each port when the first vector _i Is that

The lambda is used to indicate the amplitude ratio of the downlink reference signals received by each port when the first vector _i Beta is _i 。

7. The method of claim 5, wherein the first vector is [ beta ] _km …β _km+j …β _(k+1)m-1 …β _km …β _km+j …β _(k+1)m-1 ]Said beta _km+j Corresponding to the (km+j) th port, j=0, 1, …, m-1, k=0, 1, …, q-1;

the downlink channel information H ^DL The following formula is satisfied:

wherein the H is _j ^UL The uplink channel information corresponding to the j-th SRS port; the lambda is used to indicate the energy ratio of the downlink reference signals received by each port when the first vector _j Is that

The lambda is used to indicate the amplitude ratio of the downlink reference signals received by each port when the first vector _j Beta is _km+j 。

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

the access network device receives a second indication message from the terminal device, wherein the second indication message is used for indicating 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 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:

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

9. The method of claim 8, wherein elements in the second vector correspond one-to-one to SRS resources for antenna selection; the second vector is used to indicate a power ratio or an amplitude ratio of SRS transmitted on each SRS resource for antenna selection.

10. The method according to claim 8 or 9, wherein the access network device sending downlink data to the terminal device based on the SRS, the first vector and the second vector, comprises:

The access network equipment obtains downlink channel information based on the SRS, the first vector and the second vector; the downlink channel information comprises downlink channel information corresponding to a plurality of ports, and the amplitude ratio or the energy ratio of the downlink channel information corresponding to the ports is associated with the amplitude ratio or the energy ratio indicated by the first vector and the power ratio or the amplitude ratio indicated by the second vector;

and the access network equipment sends downlink data to the terminal equipment.

11. The method of claim 10, wherein the second vector is [ alpha ] ₀ …α _l …α _q-1 ]Wherein the alpha is _l Corresponding to the power or amplitude of SRS transmitted on the l-th SRS resource for antenna selection, the l=0, 1, …, q-1;

the downlink channel information H ^DL The following formula is satisfied:

wherein the H is _j ^UL The uplink channel information corresponding to the j-th SRS port; the eta when the second vector is used for indicating the power ratio of the SRS transmitted by the terminal equipment on each SRS resource for antenna selection _l Alpha is alpha _l The method comprises the steps of carrying out a first treatment on the surface of the The eta when the second vector is used for indicating the amplitude ratio of the SRS transmitted by the terminal equipment on each SRS resource for antenna selection _l Is that

12. A method of communication, the method comprising:

the method comprises the steps that terminal equipment sends a first indication message to access network equipment, wherein the first indication message indicates a first vector, and elements in the first vector are associated with a port of the terminal equipment for receiving downlink reference signals; the first vector is used to indicate an amplitude ratio or an energy ratio of the downstream reference signals received by the associated ports.

13. The method of claim 12, wherein the elements in the first vector are in one-to-one correspondence with ports of the terminal device that receive the downlink reference signal; the first vector is used for indicating the amplitude ratio or the energy ratio of the downlink reference signals received by each port.

14. The method according to claim 12 or 13, characterized in that the method further comprises:

the terminal equipment receives at least one Sounding Reference Signal (SRS) resource set from the access network equipment, wherein the at least one SRS resource set is used for antenna selection, the at least one SRS resource set comprises q SRS resources, each SRS resource in the q SRS resources comprises m SRS ports, the at least one SRS resource set comprises 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;

15. The method of claim 14, wherein the method further comprises:

the terminal equipment sends SRS to the access network equipment, and the SRS port of the terminal equipment for sending the SRS corresponds to the port of the terminal equipment for receiving the downlink reference signal one by one;

and the terminal equipment receives the downlink data from the access network equipment.

16. The method of claim 14, wherein the method further comprises:

the terminal equipment sends a second indication message to the access network equipment, wherein the second indication message is used for indicating 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 SRS transmitted on the associated SRS resource;

17. The method of claim 16, wherein elements in the second vector correspond one-to-one to SRS resources for antenna selection; the second vector is used to indicate a power ratio or an amplitude ratio of SRS transmitted on each SRS resource for antenna selection.

18. A communication device comprising means for performing the method of any of claims 1-11; or comprises means for performing the method of any of claims 12-17.

19. A communication device comprising a processor and interface circuitry for receiving signals from other communication devices than the communication device and transmitting signals from the processor to the processor or sending signals from the processor to other communication devices than the communication device, the processor being configured to implement the method of any of claims 1-11 or 12-17 by logic circuitry or executing code instructions.

20. A computer readable storage medium, characterized in that the storage medium has stored therein a computer program or instructions which, when executed by a communication device, implement the method of any of claims 1-11 or 12-17.

21. A computer program product, characterized in that the computer is caused to perform the method of any of claims 1-11 or 12-17 when the computer reads and executes the computer program product.