WO2022027386A1

WO2022027386A1 - Antenna selection method and apparatus

Info

Publication number: WO2022027386A1
Application number: PCT/CN2020/107241
Authority: WO
Inventors: 于晓霞; 方凯
Original assignee: 华为技术有限公司
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2022-02-10

Abstract

Provided are an antenna selection method and apparatus, which relate to the technical field of communications. An uplink antenna is selected by means of a wireless access device on the basis of an uplink signal, such that the transmission performance of an uplink of the selected antenna can be better. The specific solution involves: an access network device determining a target antenna group on the basis of a target signal from a terminal device, wherein the terminal device comprises a plurality of antenna groups, each antenna group comprising one antenna or a combination of a plurality of antennas, and the target antenna group is used by the terminal device to send an uplink signal; and the access network device sending first information to the terminal device, wherein the first information is used for indicating the target antenna group. The embodiments of the present application are used for antenna selection.

Description

Antenna selection method and device

technical field

The present application relates to the field of communication technologies, and in particular, to an antenna selection method and apparatus.

Background technique

At present, more and more terminal devices have multiple antennas, and often only one of the multiple antennas can transmit signals. Due to various external reasons, for example, the positions of each antenna are different, and the signal quality of each antenna is unbalanced due to signal refraction or scattering. Therefore, if a certain antenna is fixed as the uplink transmit antenna, it is difficult for the base station to obtain complete channel information. .

In the prior art, the problem that it is difficult for the base station to obtain complete channel information is solved by the antenna selection technology. The terminal device transmits signals through multiple antennas in turn, so that the base station can obtain the channel information corresponding to the multiple antennas. Among them, transmit antenna switch (transmit antenna switch, TAS) is a commonly used scheme for selecting uplink transmit antennas. The terminal device calculates the corresponding reference channel received power (reference signal received power, RSRP) according to the channel state information reference signal (CSIRS) received by each antenna. If there is an antenna corresponding to the CSIRS RSRP than the last selected uplink If the CSIRS RSRP of the transmitting antenna is large, and the difference between the CSIRS RSRP corresponding to the antenna and the CSIRS RSRP of the last selected uplink transmitting antenna is greater than the threshold value, the terminal equipment performs antenna switching and determines the antenna as the uplink transmitting antenna.

This TAS scheme selects the uplink transmit antenna based on the RSRP of the downlink CSIRS, which may result in poor uplink transmission performance.

SUMMARY OF THE INVENTION

Embodiments of the present application provide an antenna selection method and apparatus, where a wireless access device selects an uplink antenna based on an uplink signal, which can make the uplink transmission performance of the selected antenna better.

In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:

In a first aspect, an embodiment of the present application provides an antenna selection method. The method includes: an access network device determines a target antenna group based on a target signal from a terminal device, wherein the terminal device includes multiple antenna groups, each antenna group includes one antenna or a combination of multiple antennas, and the target antenna group is used for The terminal device sends an uplink signal; the access network device sends first information to the terminal device, where the first information is used to indicate the target antenna group.

In the antenna selection method provided by the embodiment of the present application, the access network device determines the target antenna group based on the target signal from the terminal device. That is to say, in the technical solution of the present application, the access network device selects the antenna based on the uplink target signal, thereby solving the problem that the uplink transmission may be affected by the terminal selection of the antenna based on the RSRP of the downlink CSIRS in the prior art. The problem of loss can ensure the transmission performance of the uplink of the target antenna group.

In a possible design, the method further includes: the access network device acquires second information from the terminal device, where the second information is used to indicate that the terminal device supports the antenna selection capability.

Here, the access network device is made to know that the terminal device supports the antenna selection capability through the second information, so that the access network device can perform subsequent operations of antenna selection.

In a possible design, the access network device determines the target antenna group based on the target signal from the terminal device, including: the access network device calculates, based on the target signal from the terminal device, the target parameter; the access network device calculates the weight of each uplink antenna group in the multiple uplink antenna groups according to the target parameter; the access network device determines the target antenna group according to the weight of each uplink antenna group in the multiple uplink antenna groups.

In this solution, the access network device calculates the target parameter based on the target signal, and calculates the weight of each uplink antenna group according to the target parameter, so as to determine the target antenna group according to the weight.

In a possible design, the target parameters include one or more of the following: reference signal received power RSRP, channel capacity, path loss value or channel estimation matrix. The target antenna group satisfies one or more of the following preset conditions: maximum reference signal received power RSRP, maximum channel capacity, minimum path loss value, or minimum channel correlation within the antenna group.

In this solution, the access network device not only selects the target antenna group based on RSRP, but also selects the target antenna group based on the path loss value, channel capacity or channel estimation matrix. Since the path loss value, the channel capacity and the channel estimation matrix can reflect the mutual interference between the channels, the correlation between the channels can be obtained. Therefore, the scheme can ensure that the target antenna group with the best performance can still be selected under the coherent codebook transmission.

In a possible design, the weight of each uplink antenna group in the multiple uplink antenna groups determines the target antenna group, including: if there is a first antenna group in the multiple antenna groups, making the weight of the first antenna group equal to The difference between the weights of the second antenna group is greater than or equal to the target preset value, and the second antenna group is the uplink antenna group determined last time, then the first antenna group is determined as the target antenna group; otherwise, the second antenna group is determined group is the target antenna group.

In this solution, the first antenna group is determined as the target antenna group only if the difference between the weight of the first antenna group and the weight of the uplink antenna group determined last time is greater than or equal to the first preset value. Therefore, the antenna can be switched without significantly improving the channel quality when switching the antenna, thereby reducing power consumption and system complexity.

In a possible design, if the target parameter includes RSRP, the weight of each uplink antenna group in the multiple uplink antenna groups is calculated according to the target parameter, including: for each time in a statistical period calculated and obtained according to the target signal For the RSRP of each antenna group in the multiple antenna groups, add 1 to the weight of the antenna group corresponding to the maximum RSRP, and if the difference between the RSRP of the second antenna group and the maximum RSRP is less than or equal to the first preset value, then The weight of the second antenna group is increased by 1, and the weights of other antenna groups remain unchanged.

In this solution, the access network device calculates the weight of each uplink antenna group according to the RSRP. The greater the RSRP, the greater the signal strength transmitted by the corresponding antenna group and the better the channel quality. Therefore, the antenna group with the largest RSRP is preferentially selected, and the weight of the antenna group corresponding to the largest RSRP is increased by 1.

In another possible design, if the target parameter includes the channel capacity, calculating the weight of each uplink antenna group in the multiple uplink antenna groups according to the target parameter, including: for each time in a statistical period according to the target For the channel capacity of each antenna group in the multiple antenna groups obtained by signal calculation, add 1 to the weight of the antenna group corresponding to the maximum channel capacity, and if the difference between the channel capacity of the second antenna group and the maximum channel capacity If the value is less than or equal to the second preset value, the weight of the second antenna group is increased by 1, and the weights of other antenna groups remain unchanged.

In this solution, the access network device calculates the weight of each uplink antenna group according to the channel capacity. The larger the channel capacity is, the smaller the signal noise and the smaller the signal damage will be transmitted by the corresponding antenna group, that is, the better the channel quality. Therefore, the antenna group with the largest channel capacity is preferentially selected, and the weight of the antenna group corresponding to the largest channel capacity is increased by 1.

In another possible design, if the target parameter is the path loss value, the weight of each uplink antenna group in the multiple uplink antenna groups is calculated according to the target parameter, including: for each time in a statistical period according to the target signal Calculate the path loss value of each antenna group in the obtained multiple antenna groups, add 1 to the weight of the antenna group corresponding to the minimum path loss value, and if the difference between the path loss value of the second antenna group and the minimum path loss value If it is less than or equal to the third preset value, the weight of the second antenna group is increased by 1, and the weights of other antenna groups remain unchanged.

In this solution, the access network device calculates the weight of each uplink antenna group according to the path loss value. The smaller the path loss value is, the smaller the damage to the signal transmitted by the corresponding antenna group, the smaller the channel interference, that is, the better the channel quality. Therefore, the antenna group with the smallest path loss value is preferentially selected, and the weight of the antenna group corresponding to the smallest path loss value is increased by 1.

In yet another possible design, if the target parameter includes a channel estimation matrix, calculating the weight of each uplink antenna group in the multiple uplink antenna groups according to the target parameter includes: for each time in a statistical period according to For the channel estimation matrix of each of the multiple antenna groups obtained by the target signal calculation, add 1 to the weight of the antenna group corresponding to the channel estimation matrix with the largest rank, and if the target antenna group of the second antenna group is the same as the rank If the difference between the antenna groups corresponding to the largest channel estimation matrix is less than or equal to the fourth preset value, the weight of the second antenna group is increased by 1, and the weights of other antenna groups remain unchanged.

In this solution, the access network device calculates the weight of each uplink antenna group according to the channel estimation matrix. The larger the rank of the channel estimation matrix, the larger the number of channels that can be selected for the signal transmitted by the corresponding antenna group, the smaller the correlation between the channels, the better the channel quality, and the larger the channel multiplexing gain. Therefore, the antenna group with the largest rank of the channel estimation matrix is preferentially selected, and 1 is added to the weight of the antenna group corresponding to the channel estimation matrix with the largest rank.

In a possible design, the target signal includes a channel sounding reference signal SRS or a demodulation reference signal DMRS.

In this solution, the target signal is an uplink signal sent from the terminal device to the access network device.

In a possible design, the first information includes downlink control information DCI, medium access control control element MAC CE or radio resource control RRC signaling.

In this solution, the access network device can send the first information to the terminal device when DCI, MAC CE or RRC has idle resources.

In a possible design, the second information includes uplink control information UCI, medium access control control element MAC CE or radio resource control RRC signaling.

In this solution, the terminal device can send the second information to the access network device when the UCI, MAC CE or RRC has idle resources.

In a second aspect, an embodiment of the present application provides an antenna selection method, which is applied to a terminal device. The method includes: a terminal device sends second information to an access network device, where the second information is used to indicate that the terminal device supports an antenna selection capability; the terminal device sends a target signal to the access network device; The first information of the access network device, where the first information is used to indicate the target antenna group. The terminal device includes multiple antenna groups, each antenna group includes one antenna or a combination of multiple antennas, and the target antenna group is used for the terminal device to send uplink signals.

In this solution, the terminal device sends the second information and the target signal to the access network device, so that the access network device selects the target antenna group according to the target signal. This solves the problem in the prior art that the terminal may select an antenna based on the RSRP of the downlink CSIRS, which may cause the impairment of the uplink transmission, and can ensure the uplink transmission performance of the target antenna group.

In a third aspect, an embodiment of the present application provides a communication device. The communication device includes a transceiver module and a processing module. The processing module is configured to: determine a target antenna group based on a target signal from a terminal device, the terminal device includes multiple antenna groups, each antenna group includes one antenna or a combination of multiple antennas, and the target antenna group is used for the terminal The device sends an uplink signal. The processing module is further configured to send first information to the terminal device through the transceiver module, where the first information is used to indicate the target antenna group.

In a possible design, the processing module is further configured to obtain second information from the terminal device through the transceiver module, where the second information is used to instruct the terminal device to support the antenna selection capability.

In a possible design, the processing module is further configured to: calculate the target parameter of each uplink antenna group in the multiple uplink antenna groups based on the target signal from the terminal device; calculate each uplink antenna group in the multiple uplink antenna groups according to the target parameter The weight of the antenna group; the target antenna group is determined according to the weight of each uplink antenna group in the multiple uplink antenna groups.

In a possible design, the processing module is further configured to: if the first antenna group exists in the multiple antenna groups, make the difference between the weight of the first antenna group and the weight of the second antenna group greater than or equal to the target prediction If the value is set, the second antenna group is the uplink antenna group determined last time, and the target antenna group of the first antenna group is determined; otherwise, the second antenna group is determined as the target antenna group.

In a possible design, the processing module is further configured to: for the RSRP of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, calculate the RSRP of the antenna group corresponding to the maximum RSRP The weight is increased by 1, and if the difference between the RSRP of the second antenna group and the maximum RSRP is less than or equal to the first preset value, then the weight of the second antenna group is increased by 1, and the weights of other antenna groups are constant.

In a possible design, the processing module is further configured to: for the channel capacity of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, assign the maximum channel capacity to the corresponding channel capacity. The weight of the antenna group is increased by 1, and if the difference between the channel capacity of the second antenna group and the maximum channel capacity is less than or equal to the second preset value, then the weight of the second antenna group is increased by 1, The weights of other antenna groups remain unchanged.

In a possible design, the processing module is further configured to: for the path loss value of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, assign the antenna corresponding to the minimum path loss value The weight of the second antenna group is increased by 1, and if the difference between the path loss value of the second antenna group and the minimum path loss value is less than or equal to the third preset value, the weight of the second antenna group is increased by 1, and the weights of the other antenna groups are The weight remains unchanged.

In a possible design, the processing module is further configured to: for the channel estimation matrix of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, estimate the channel with the largest rank The weight of the antenna group corresponding to the matrix is increased by 1, and if the difference between the target antenna group of the second antenna group and the antenna group corresponding to the channel estimation matrix with the largest rank is less than or equal to the fourth preset value, the second The weight of the antenna group is increased by 1, and the weights of other antenna groups remain unchanged.

In another possible design, the second information includes uplink control information UCI, medium access control control element MAC CE or radio resource control RRC signaling.

In a fourth aspect, an embodiment of the present application provides a communication device. The communication device includes a transceiver module and a processing module. Wherein, the processing module is used for: sending second information to the access network equipment through the transceiver module, the second information is used to instruct the terminal equipment to support the antenna selection capability; the processing module is further used for: sending the target signal to the access network equipment through the transceiver module The processing module is further configured to: receive first information from the access network device through the transceiver module, the first information is used to indicate a target antenna group, and the target antenna group is used for the terminal device to send an uplink signal.

In a fifth aspect, an embodiment of the present application provides a communication device. The communication device includes a processor and a memory. The memory is used to store computer instructions, and when the communication device is running, the processor executes the computer instructions stored in the memory to implement the antenna selection method in any possible design of the first aspect or the antenna selection method of the second aspect.

In a sixth aspect, an embodiment of the present application provides an antenna selection system, which is characterized in that it includes the communication device in any possible design of the third aspect, and the communication device in the fourth aspect.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, comprising computer instructions, when the computer instructions are executed on a computer or a processor, the computer or the processor is made to execute any one of the first aspect to the second aspect Antenna selection methods in possible designs.

In an eighth aspect, the embodiments of the present application provide a computer program product, when the computer program product is run on a computer or a processor, the computer or processor can perform any one of the possible designs of the first aspect to the second aspect. antenna selection method.

For the beneficial effects corresponding to the above-mentioned other aspects, reference may be made to the description of the beneficial effects of the method, which will not be repeated here.

Description of drawings

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

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

FIG. 3 is another schematic diagram of a communication device according to an embodiment of the present application;

FIG. 4 is a flowchart of an antenna selection method provided by an embodiment of the present application;

FIG. 5 is another flowchart of an antenna selection method provided by an embodiment of the present application;

FIG. 6 is another schematic diagram of a communication system provided by an embodiment of the present application;

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

detailed description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Wherein, in the description of the embodiments of the present application, unless otherwise stated, “/” means or means, for example, A/B can mean A or B; “and/or” in this document is only a description of the associated object The association relationship of , indicates that there can be three kinds of relationships, for example, A and/or B, can indicate that A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "plurality" refers to two or more than two.

Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of this embodiment, unless otherwise specified, "plurality" means two or more.

This embodiment of the present application provides an antenna selection method, which can be applied to the communication system 100 shown in FIG. 1 . Referring to FIG. 1, the communication system 100 may include a terminal device 101, an access network device 102, and the like.

The terminal device 101 is an entity on the user side that is used for receiving a signal, or sending a signal, or receiving a signal and sending a signal. The terminal device 101 has at least one antenna through which signals are transmitted or received. For example, the terminal device 101 shown in FIG. 1 has four antennas in total: Antenna 0 , Antenna 1 , Antenna 2 , and Antenna 3 . The terminal equipment 101 may also be referred to as user equipment (UE), terminal, access terminal equipment, subscriber unit, subscriber station, mobile station, remote station, remote terminal equipment, mobile equipment, user terminal equipment, wireless communication equipment , user agent or user device. The terminal device 101 may be an electricity meter, a water meter, or the like. The terminal device can also be a V2X device, such as smart car (smart car or intelligent car), digital car (digital car), unmanned car (unmanned car or driverless car or pilotless car or automobile), self-driving car (self-driving car) or autonomous car), pure EV (pure EV or Battery EV), hybrid electric vehicle (HEV), range extended EV (REEV), plug-in HEV (plug-in HEV) , PHEV), new energy vehicle (new energy vehicle), roadside unit (road site unit, RSU). The terminal device 101 may also be a B2C device or a B2B device or the like. In addition, the terminal device 101 in this embodiment of the present application may also be a mobile station (mobile station, MS), a subscriber unit (subscriber unit), an unmanned aerial vehicle, an internet of things (Internet of things, IoT) device, a station in a WLAN ( station, ST), cellular phone (cellular phone), smart phone (smart phone), cordless phone, wireless data card, tablet computer, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop) , WLL) station, personal digital assistant (PDA) device, laptop computer (laptop computer), AR device, VR device or machine type communication (machine type communication, MTC) terminal device. The terminal device 101 may also be a handheld device with a wireless communication function, a computing device, or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, or the like.

The access network device 102 is a device that provides a wireless communication function for the terminal device 101 . The access network device 102 includes, but is not limited to, a next-generation base station (gnodeB, gNB) in 5G, an evolved node B (evolved node B, eNB), a radio network controller (radio network controller, RNC), a node B ( node B, NB), base station controller (BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved nodeB, or home node B, HNB), baseband unit (baseBand unit) , BBU), transmission point (transmitting and receiving point, TRP), transmitting point (transmitting point, TP), mobile switching center, etc.

Exemplarily, FIG. 2 shows a schematic diagram of a hardware structure of a communication apparatus 200 provided by an embodiment of the present application. In this embodiment of the present application, the communication apparatus 200 may be an access network device, and the communication apparatus 200 may also be a terminal device. The communication device 200 includes a processor 201, a communication line 202, a memory 203 and at least one communication interface (in FIG. 2, the communication interface 204 is used as an example for illustration).

The processor 201 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors for controlling the execution of the programs of the present application. integrated circuit.

The communication link 202 may include a path to communicate information between the components described above.

Communication interface 204, using any transceiver-like device, for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. . It will be appreciated that the communication interface 204 may be an antenna.

Memory 203 may be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM) or other types of information and instructions It can also be an electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being executed by a computer Access any other medium without limitation. The memory may exist independently and be connected to the processor through the communication line 202 . The memory can also be integrated with the processor.

The memory 203 is used for storing computer-executed instructions for executing the solution of the present application, and the execution is controlled by the processor 201 . The processor 201 is configured to execute the computer-executed instructions stored in the memory 203, thereby implementing the access methods provided by the following embodiments of the present application.

Optionally, the computer-executed instructions in the embodiment of the present application may also be referred to as application code, which is not specifically limited in the embodiment of the present application.

In a specific implementation, as an embodiment, the processor 201 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 2 .

In a specific implementation, as an embodiment, the communication apparatus 200 may include multiple processors, such as the processor 201 and the processor 208 in FIG. 2 . Each of these processors can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).

In a specific implementation, as an embodiment, the communication apparatus 200 may further include an output device 205 and an input device 206 . The output device 205 is in communication with the processor 201 and can display information in a variety of ways. For example, the output device 205 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector (projector) Wait. Input device 206 is in communication with processor 201 and can receive user input in a variety of ways. For example, the input device 206 may be a mouse, a keyboard, a touch screen device, a sensor device, or the like.

Exemplarily, FIG. 3 shows another schematic structural diagram of a communication apparatus provided by an embodiment of the present application. Referring to FIG. 3, the communication device 300 at least includes a physical (PHY) layer 303, a media access control (MAC) layer 302, and a radio resource control (radio resource control, RRC) layer 301, which are respectively denoted as L1 layers , L2 and L3 layers.

Among them, the PHY layer is used to handle coding and decoding, modulation and demodulation, multi-antenna mapping and other telecommunication physical layer functions. The PHY layer provides a reliable environment for data transmission, ensuring that the original data can be transmitted over various physical media. The PHY layer serves the MAC layer in the form of transport channels. For example, referring to FIG. 6 , the PHY layer of the access network device may receive the target signal sent by the PHY layer of the terminal device, such as a channel sounding reference signal (sounding reference signal, SRS) or a demodulation reference signal (demodulation reference signal, DMRS).

The MAC layer is used to provide access control capabilities for the PHY layer, such as addressing mode, access coordination, frame check sequence generation and checking, etc. The MAC layer is also used to provide services to the next layer, such as the RRC layer, in the form of logical channels. For example, referring to FIG. 6 , the MAC layer of the wireless access device may select the target antenna group according to the information reported by the PHY layer, and report the target antenna group to the next layer.

The RRC layer is used for broadcasting system information, establishing, maintaining and releasing RRC connections, establishing, reconfiguring and releasing radio bearers, allocating, reconfiguring and releasing radio resources for RRC connections. It can be considered that the RRC layer is the control center of all lower layers in each system, such as the control center of the PHY layer and the MAC layer, to control all the radio resources of the lower layers, so that the communication between the terminal equipment and the access network equipment become possible. For example, referring to FIG. 6 , the RRC layer of the terminal device may send information that the terminal device supports antenna selection capability to the RRC layer of the access network device, and receive information indicating the target antenna combination from the RRC layer of the access network device.

Taking the communication system shown in FIG. 1 as an example, in an uplink antenna selection scheme in the prior art, the terminal device 101 calculates the corresponding reference signal according to the channel state information reference signal (CSIRS) received by each antenna. The channel received power (reference signal received power, RSRP) is used to select the uplink transmit antenna. Taking a 1T4R terminal device as an example, the 1T4R terminal device means that the terminal device has 4 antennas, and only 1 antenna is selected from the 4 antennas as an uplink transmission antenna. Assuming that the terminal device selected antenna 0 as the uplink transmission antenna for data transmission last time, then in the process of this antenna selection, antenna 0, antenna 1, antenna 2 and antenna 3 on the terminal device receive the downlink transmission respectively. After CSIRS, the terminal device measures the CSIRS RSRP corresponding to each antenna respectively, and selects the antenna with the largest CSIRS RSRP value among antenna 1, antenna 2 and antenna 3, and counts it as antenna M. If the CSIRS RSRP corresponding to antenna M is larger than the last selected uplink transmission antenna, that is, the CSIRS RSRP corresponding to antenna 0 is larger, and the difference between the CSIRS RSRP corresponding to antenna M and the CSIRS RSRP of antenna 0 is greater than the threshold value, for example, 3dB～6dB , then the antenna M is the optimal antenna in this antenna selection, and the terminal device performs antenna switching, and determines the antenna M as the uplink transmission antenna, that is, the target antenna.

The present application provides an antenna selection method. In the antenna selection method provided by this application, the access network device determines the target antenna group based on the uplink target signal from the terminal device, and then the access network device sends information indicating the target antenna group to the terminal device, so that the terminal device can Determines the uplink transmit antenna group used in the uplink transmission. Therefore, it is possible to ensure that the uplink transmission performance is better.

The antenna selection scheme adopted in the prior art is based on the downlink CSIRS, and the terminal device calculates the RSRP value of the CSIRS received by each antenna to select the target antenna group. Since the channel in actual use is not an ideal channel, there may be factors such as insertion loss or reduction of the specific absorption rate (SAR) of electromagnetic waves. Therefore, the process of selecting the target antenna group by the terminal equipment may lead to the destruction of the reciprocity of the uplink and downlink channels. , so that the RSRP of the downlink CSIRS continues to be used to select the target antenna group for uplink transmission, which may damage the uplink transmission performance.

The antenna selection method provided by the embodiments of the present application will be described below with reference to the structure of the communication device and the communication system described above. Referring to FIG. 4 , an antenna selection method is provided in an embodiment of the present application. The method includes:

401. The terminal device sends second information to the access network device, where the second information is used to indicate that the terminal device supports the antenna selection capability.

The second information may also be referred to as capability indication information or the like.

Wherein, the terminal equipment can send to the access network equipment by at least one of uplink control information (uplink control information, UCI), medium access control element (MAC control element, MAC CE) or radio resource control RRC signaling, etc. second information.

Exemplarily, if the terminal device supports the antenna selection capability, in the presence of idle UCI, MAC CE or RRC resources, the terminal device will send a second message to the access network device on the idle UCI, MAC CE or RRC resources. information to indicate to the access network device that the terminal device supports the antenna selection capability, so that the access network device can perform the antenna selection operation.

The description is given by taking the terminal device sending the second information to the access network device through the MAC CE as an example. If the terminal device can obtain an identifier such as a logical channel identification (LCID), that is, if there is an idle MAC CE that can send the second information, the terminal device can send the second information to the access network device through the LCID corresponding to the MAC CE. second information.

Correspondingly, after receiving the second information, the access network device can instruct the access network device that the terminal device supports the antenna selection capability. For example, after receiving the second information, the access network device may use RRC signaling to indicate to the access network device that the terminal device supports the antenna selection capability. Further, the access network device performs the operation of subsequent antenna selection.

Specifically, referring to FIG. 6 , the access network device can receive the second information through the L3 layer, and then the L3 layer sends RRC signaling to the L1 layer, instructing the terminal device to support the antenna selection capability, so that the access network device can perform subsequent antenna selection operations .

It should be noted that step 401 is optional, and the access network device can also learn that the terminal device supports the antenna selection capability in other ways; or, the access network device can also trigger itself to determine the target antenna group in other ways, which is implemented in this application. The example is not limited to this method.

402. The terminal device sends a target signal to the access network device.

The target signal is a signal sent by the terminal device to the access network device. For example, the target signal may be a system signal that is not used for data transmission. Exemplarily, the target signal includes a channel sounding reference signal SRS or a demodulation reference signal DMRS or the like. The terminal device sends the target signal to the access network device through each antenna.

Accordingly, the access network device receives the target signal from the terminal device.

Specifically, referring to FIG. 6 , the L1 layer of the access network device can receive the target signal from the terminal device.

403. The access network device determines a target antenna group based on the target signal from the terminal device.

Wherein, the target antenna group is used for the terminal equipment to send uplink signals. That is to say, the target antenna group is the optimal uplink antenna group selected by the access network device for the terminal device.

The uplink signal sent by the target antenna group may be a data signal, which is used for data transmission. For example, the uplink signal may be a signal capable of transmitting user service data, such as a service signal.

It can be understood that the terminal device may include multiple antenna groups, and each antenna group includes one antenna or a combination of multiple antennas. Thus, the target signal from the terminal device is the target signal from multiple antenna groups of the terminal device. That is, the terminal device in this embodiment of the present application may be an nTmR terminal device, where n and m are integers greater than or equal to 1, and n is less than or equal to m.

For example, for a 1T4R terminal device, the terminal device includes 4 antenna groups, and each antenna group has only one antenna. For example, the four antenna groups include Antenna 0, Antenna 1, Antenna 2, and Antenna 3, and Antenna 0, Antenna 1, Antenna 2, and Antenna 3 are respectively one antenna group. The target signal of each antenna group is the target signal transmitted by this antenna.

For another example, the 2T4R terminal device indicates that the terminal device has 4 antennas, and 2 antennas are selected from the 4 antennas as the uplink transmission antenna group. For 2T4R terminal equipment, the terminal equipment includes 4 antennas, 6 antenna groups, and each antenna group has 2 antennas. Assuming that the 4 antennas are Antenna 0, Antenna 1, Antenna 2 and Antenna 3, the 6 antenna groups are: Antenna Group 1 (Antenna 0 and Antenna 1), Antenna Group 2 (Antenna 2 and Antenna 3), Antenna Group 3 (Antenna 0 and Antenna 2), Antenna Group 4 (Antenna 1 and Antenna 3), Antenna Group 5 (Antenna 0 and Antenna 3), and Antenna Group 6 (Antenna 1 and Antenna 2). The target signal of each antenna group is the target signal transmitted by the two antennas respectively.

The process of step 403 is specifically described below by taking the target signal as an SRS as an example. Referring to Figure 5, step 403 specifically includes:

403a. The access network device calculates the target parameter of each uplink antenna group in the multiple uplink antenna groups based on the SRS from the terminal device.

After the access network device receives the second information and learns that the terminal device supports the antenna selection capability, the access network device may perform corresponding configuration to measure the SRS from the terminal device. For example, the access network equipment may measure the SRS from the terminal equipment including: RSRP measurement, signal to interference plus noise ratio (signal to interference plus noise ratio, SINR) measurement or channel matrix estimation measurement, etc.

The access network device may be configured through RRC signaling or other signaling to measure the SRS signal. This embodiment of the present application does not limit the configuration mode of the access network device.

Specifically, referring to FIG. 6 , the access network device may send RRC signaling from the L3 layer to the L1 layer to configure the L1 layer to measure the received SRS.

Optionally, the access network device L3 layer sends RRC signaling to the L1 layer, indicating that the terminal device supports the RRC signaling of the antenna selection capability, and the access network device sends RRC signaling from the L3 layer to the L1 layer to configure the L1 layer. The RRC signaling for SRS measurement can be sent together at the same time, or sent separately. This embodiment of the present application does not limit this.

It should be noted that the access network equipment may not send RRC signaling from the L3 layer to the L1 layer, indicating that the terminal equipment supports the ability of antenna selection; only the L3 sends the RRC signaling to the L1 layer to configure the L1 layer to the terminal equipment. SRS is measured.

After measuring the SRS from the terminal equipment, the access network equipment calculates the target parameters of each uplink antenna group in the multiple uplink antenna groups respectively.

The target parameters include one or more of the following: reference signal received power RSRP, channel capacity, path loss (path loss, PL) value or channel estimation matrix.

Specifically, for different target parameters, the access network device calculates the target parameters in different ways.

For example, referring to FIG. 6 , if the target parameter is RSRP, after the L3 layer of the access network device sends RRC signaling to the L1 layer, the L1 layer performs RSRP measurement on the received SRS signal to obtain the RSRP of each uplink antenna group . Next, the L1 layer sends the obtained RSRP to the L2 layer, so that the L2 layer calculates the weight of each antenna group.

For another example, referring to FIG. 6 , if the target parameter is a path loss value, after the L3 layer of the access network device sends RRC signaling to the L1 layer, the L1 layer performs RSRP measurement on the received SRS signal. After the L1 layer sends the measured RSRP to the L2 layer, the L2 layer can calculate the path loss value corresponding to each antenna group based on the RSRP, and calculate the weight value of each antenna group.

Among them, the path loss PL value can be calculated by formula (1):

PL=Pmax-10lgM-RSRP (1)

Among them, Pmax represents the maximum transmit power, and M represents the allocation number of resource blocks (RBs). The path loss value can reflect the channel damage.

For another example, referring to FIG. 6 , if the target parameter is channel capacity, after the L3 layer of the access network device sends RRC signaling to the L1 layer, the L1 layer performs SINR measurement on the received SRS signal. After the L1 layer sends the measured SINR to the L2 layer, the L2 layer can calculate the channel capacity corresponding to each antenna group based on the SINR, and calculate the weight of each antenna group.

Among them, the channel capacity can be continuously calculated by formula (2):

Thr=log2(1+SINR) (2)

Among them, Thr represents the channel capacity.

Since there is a corresponding relationship between the SINR and the channel matrix, the channel capacity calculated based on the SINR can reflect the channel performance of the corresponding antenna group.

For another example, referring to FIG. 6 , if the target parameter is a channel estimation matrix, after the L3 layer of the access network device sends RRC signaling to the L1 layer, the L1 layer measures the channel estimation matrix on the received SRS signal. After the L1 layer sends the obtained channel estimation matrix corresponding to each antenna group to the L2 layer, the L2 layer can calculate the rank of the channel estimation matrix based on the channel estimation matrix, and calculate the weight of each antenna group.

Wherein, the access network device can calculate the channel estimation matrix according to formula (3):

Wherein, XP represents the SRS transmitted by one antenna group of the terminal device, and Y _P represents the SRS received by the access network device _. The channel estimation matrix can reflect the correlation between channels.

It can be understood that, each antenna group can calculate its corresponding channel estimation matrix through the above formula.

It should be noted that if each antenna group includes multiple antennas, the SRS of each antenna group in the multiple antenna groups is the SRS transmitted by the multiple antennas respectively. Therefore, the target parameter of each antenna group is the access network. Calculated after the device receives the SRS transmitted from each antenna in each antenna group.

403b. The access network device calculates the weight of each uplink antenna group in the multiple uplink antenna groups according to the target parameter.

The access network device may calculate the weight of each uplink antenna group in the multiple uplink antenna groups according to the target parameter, such as RSRP, channel capacity, path loss value or at least one target parameter in the channel estimation matrix.

For example, the weight of each uplink antenna group may also be a count value corresponding to each uplink antenna group. Specifically, step 403b is performed by the L2 layer of the access network device.

Step 403b is specifically described below based on different target parameters.

plan 1

If the target parameter includes RSRP, the access network device calculates the weight of each uplink antenna group in the multiple uplink antenna groups according to the RSRP, including:

For the RSRP of each antenna group in the multiple antenna groups calculated according to the SRS each time in a statistical period, the access network device adds 1 to the weight of the antenna group corresponding to the maximum RSRP, and if the uplink antenna determined last time If the difference between the RSRP of the group and the maximum RSRP is less than or equal to the first preset value, the access network device also adds 1 to the weight of the uplink antenna group determined last time, and the weights of other antenna groups remain unchanged.

The uplink antenna group determined last time is the target antenna group determined in the last statistical period.

In a statistical period, each antenna group of the terminal device sends SRS to the access network device multiple times in a polling manner, and accordingly, the access network device receives the SRS sent by each antenna group multiple times, so as to calculate the weight multiple times. value. In a statistical period, each antenna group of the terminal equipment polls at least once, and sends the SRS to the access network equipment.

For example, according to the above content, the 2T4R terminal device has 6 antenna groups. In a statistical period, the 6 antenna groups of the 2T4R terminal equipment send SRS to the access network equipment in sequence. Sending SRS by each antenna group to the access network device means that two antennas in each antenna group simultaneously send SRS to the access network device. In a statistical period, if the 6 antenna groups poll and send the SRS 4 times in total, the access network device calculates the weight once after the 6 antenna groups all send the SRS once. That is to say, the access network device calculates the weights four times in total.

Optionally, the statistical period may be configured in advance, or may be set by the user according to requirements. This embodiment of the present application does not limit the configuration mode and specific duration of the statistics period.

Optionally, the first preset value may be configured in advance, or may be set by the user according to requirements. The embodiment of the present application does not limit the configuration manner of the first preset value.

It should be noted that, in order to improve the accuracy of antenna selection and ensure timely selection of the optimal antenna group, the first preset value is usually set to a small value. For example, the first preset value may be 0.5dB or 0.6dB or the like. The specific value of the first preset value is not limited in this embodiment of the present application.

Among them, the maximum RSRP indicates that the signal strength transmitted by the corresponding antenna group is the maximum, and the channel quality is the best. Therefore, the antenna group with the largest RSRP is preferentially selected, and the weight of the antenna group corresponding to the largest RSRP is increased by 1.

It can be understood that if the difference between the RSRP of the last determined uplink antenna group and the maximum RSRP is less than or equal to the first preset value, it indicates that although the antenna group corresponding to the maximum RSRP is currently the optimal choice, because the maximum RSRP is different from the maximum RSRP. The difference in RSRP of the uplink antenna group determined last time is small, and the beneficial effect of switching antennas is limited, and switching antennas means that the terminal needs to perform more operations, which may lead to greater power consumption and system complexity. Therefore, for the principle of saving, the weight of the uplink antenna group determined last time is also increased by 1. That is to say, when the difference between the RSRP of the uplink antenna group determined last time and the maximum RSRP value is less than or equal to the first preset value, the antenna group determined last time is preferentially selected, and the weight of the antenna group determined last time is given priority. The value is incremented by 1.

Scenario 2

If the target parameter includes the path loss value, the access network device calculates the weight of each uplink antenna group in the multiple uplink antenna groups according to the path loss value, including:

For the path loss value of each antenna group in the multiple antenna groups calculated according to the SRS each time in a statistical period, the access network device adds 1 to the weight of the antenna group corresponding to the minimum path loss value, and if the last time The difference between the determined path loss value of the uplink antenna group and the minimum path loss value is less than or equal to the second preset value, then the access network device also adds 1 to the weight of the uplink antenna group determined last time, and the weights of other antenna groups are increased by 1. The weight remains unchanged.

Optionally, the second preset value may be configured in advance, or may be set by the user according to requirements. This embodiment of the present application does not limit the configuration manner of the second preset value.

It should be noted that, in order to improve the accuracy of antenna selection and ensure timely selection of the optimal antenna group, the second preset value is usually set to a smaller value. For example, the second preset value may be 0.5dB or 0.6dB or the like. The specific value of the second preset value is not limited in this embodiment of the present application.

Among them, the minimum path loss value indicates that the signal transmitted by the corresponding antenna group is the least damaged, and the channel interference is the least, that is, the channel quality is the best. Therefore, the antenna group with the smallest path loss value is preferentially selected, and the weight of the antenna group corresponding to the smallest path loss value is increased by 1.

It can be understood that, if the difference between the path loss value of the uplink antenna group determined last time and the minimum path loss value is less than or equal to the second preset value, it means that although the antenna group corresponding to the minimum path loss value is currently the best choice , but because the difference between the minimum path loss value and the path loss value of the uplink antenna group determined last time is small, the beneficial effect of switching antennas is limited, and switching antennas means that the terminal needs to perform more operations, which may lead to larger Power consumption and system complexity. Therefore, for the principle of saving, the weight of the uplink antenna group determined last time is also increased by 1. That is to say, when the difference between the path loss value of the last determined uplink antenna group and the minimum path loss value is less than or equal to the second preset value, the last determined antenna group is preferentially selected, and the last determined antenna group is The weight of the antenna group is increased by 1.

Scenario 3

If the target parameter includes the channel capacity, the access network device calculates the weight of each uplink antenna group in the multiple uplink antenna groups according to the channel capacity, including:

For the channel capacity of each antenna group in the multiple antenna groups calculated according to the SRS each time in a statistical period, the access network device adds 1 to the weight of the antenna group corresponding to the maximum channel capacity, and if the last determined channel capacity If the difference between the channel capacity of the uplink antenna group and the maximum channel capacity is less than or equal to the third preset value, the access network device also adds 1 to the weight of the uplink antenna group determined last time, and the weights of other antenna groups remain unchanged. .

Optionally, the third preset value may be configured in advance, or may be set by the user according to requirements. This embodiment of the present application does not limit the configuration manner of the third preset value.

It should be noted that, in order to improve the accuracy of antenna selection and ensure timely selection of the optimal antenna group, the third preset value is usually set to a small value. For example, the third preset value may be 0.5dB or 0.6dB or the like. The specific value of the third preset value is not limited in this embodiment of the present application.

Among them, the maximum channel capacity indicates that the corresponding antenna group can bring the best performance for transmitting signals. Therefore, the antenna group with the largest channel capacity is preferentially selected, and the weight of the antenna group corresponding to the largest channel capacity is increased by 1.

It can be understood that, if the difference between the channel capacity of the uplink antenna group determined last time and the maximum channel capacity is less than or equal to the third preset value, it means that although the antenna group corresponding to the maximum channel capacity is currently the best choice, due to The difference between the maximum channel capacity and the channel capacity of the uplink antenna group determined last time is small, and the beneficial effect of switching antennas is limited. Switching antennas means that the terminal needs to perform more operations, which may lead to greater power consumption and system complexity. Spend. Therefore, for the principle of saving, the weight of the uplink antenna group determined last time is also increased by 1. That is to say, when the difference between the channel capacity of the uplink antenna group determined last time and the maximum channel capacity is less than or equal to the third preset value, the antenna group determined last time is preferentially selected, so that the maximum channel capacity corresponds to In the case of adding 1 to the weight of the antenna group of 1, the weight of the last determined antenna group is also increased by 1.

Scenario 4

If the target parameter includes the channel estimation matrix, the access network device calculates the weight of each uplink antenna group in the multiple uplink antenna groups according to the channel estimation matrix, including:

For the channel estimation matrix of each antenna group in the multiple antenna groups calculated according to the SRS each time in a statistical period, the access network device adds 1 to the weight of the antenna group corresponding to the channel estimation matrix with the largest rank, and if If the difference between the rank of the channel estimation matrix of the uplink antenna group determined last time and the maximum rank is less than or equal to the fourth preset value, the access network device also adds 1 to the weight of the uplink antenna group determined last time, and other antennas The weights of the groups remain unchanged.

The fourth preset value may be configured in advance, or may be set by the user according to requirements. This embodiment of the present application does not limit the configuration manner of the fourth preset value.

It should be noted that, in order to improve the accuracy of antenna selection and ensure timely selection of the optimal antenna group, the fourth preset value is usually set to a small value. For example, the fourth preset value may be 0.5dB or 0.6dB or the like. The specific value of the fourth preset value is not limited in this embodiment of the present application.

Among them, the maximum rank of the channel estimation matrix indicates that the correlation between the channels is the minimum, and the multiplexing gain of the channels is the maximum. Therefore, the antenna group with the largest RSRP is preferentially selected, and 1 is added to the weight of the antenna group corresponding to the channel estimation matrix with the largest rank.

It can be understood that, if the difference between the rank of the channel estimation matrix of the uplink antenna group determined last time and the maximum rank is less than or equal to the fourth preset value, it means that although the antenna group corresponding to the channel estimation matrix with the largest rank is currently the highest. However, due to the small difference between the maximum rank and the rank of the channel estimation matrix of the uplink antenna group determined last time, the beneficial effect of switching antennas is limited, and switching antennas means that the terminal needs to perform more operations, which may lead to more Large power consumption and system complexity. Therefore, for the principle of saving, the weight of the uplink antenna group determined last time is also increased by 1. That is to say, when the difference between the rank of the channel estimation matrix of the uplink antenna group determined last time and the maximum rank is less than or equal to the fourth preset value, the antenna group determined last time is preferentially selected, and the The weight of the antenna group is increased by 1.

It can be understood that, the above description mainly takes as an example that the access network device determines the target antenna group based on each of the above-mentioned target parameters and the corresponding preset conditions. The access network device may also calculate the weight of each uplink antenna group in the multiple uplink antenna groups based on multiple target parameters in the foregoing target parameters, so as to determine the target antenna group based on multiple preset conditions. This embodiment of the present application does not limit this.

After calculating the weight of each uplink antenna group according to step 403b, the method executes step 403c.

403c. The access network device determines the target antenna group according to the weight of each uplink antenna group in the multiple uplink antenna groups.

Wherein, the access network device determines the target antenna group according to the weight of each uplink antenna group, including:

If the first antenna group exists in the multiple antenna groups, so that the difference between the weight of the first antenna group and the weight of the uplink antenna group determined last time is greater than or equal to the target preset value, the access network device determines the first antenna group. The antenna group is the target antenna group; otherwise, the access network device determines the last determined uplink antenna group as the target antenna group.

Optionally, the target preset value may be configured in advance, or may be set by the user according to requirements. This embodiment of the present application does not limit the setting manner of the target preset value.

where the target preset value is a small integer, such as 1 or 2. The present application does not limit the specific value of the target preset value in the embodiment.

The target antenna group is the optimal antenna group selected by the access network device, and then the terminal device sends the uplink signal through the target antenna group.

It can be understood that if the difference between the weight of the first antenna group and the weight of the uplink antenna group determined last time is greater than or equal to the target preset value, it means that within a statistical period, the channel corresponding to the first antenna group The number of times with the best quality is the most, that is to say, the first antenna group is the currently optimal uplink antenna group as a whole.

It can also be understood that if the weight of the first antenna group is smaller than the weight of the uplink antenna group determined last time, it indicates that the uplink antenna group determined last time is the optimal uplink antenna group, and antenna switching is not required; The weight of the first antenna group is greater than the weight of the uplink antenna group determined last time, and the difference between the weight of the first antenna group and the weight of the uplink antenna group determined last time is smaller than the target preset value, indicating that although On the whole, the first antenna group is the target-optimized uplink antenna group, but compared with the uplink antenna group determined last time, the channel quality of the first antenna group is not significantly improved. However, since antenna switching requires more operations by the terminal equipment, power consumption and system complexity are increased. Therefore, in this case, the access network equipment still selects the last determined uplink antenna group as the target antenna group.

After step 403, the antenna selection method provided by this embodiment of the present application further includes step 404:

404. The access network device sends first information to the terminal device, where the first information is used to indicate the target antenna group.

The first information may also be referred to as antenna indication information or the like.

Wherein, the access network device can send the first information to the terminal device by at least one of downlink control information (downlink control information, DCI), medium access control control unit MAC CE or radio resource control RRC signaling.

Since the target parameters include one or more of the following: reference signal received power RSRP, channel capacity, path loss value or channel estimation matrix, the target antenna group satisfies one or more of the following preset conditions: reference signal received power RSRP is the largest, The channel capacity is the largest, the path loss value is the smallest, or the channel correlation within the antenna group is the smallest. Wherein, these preset conditions may also be referred to as the reference for the access network device to select the antenna. For example, the RSRP maximum reference, the channel capacity maximum reference, the path loss value minimum reference, and the antenna correlation minimum reference. The target antenna group can also be regarded as an uplink antenna group that satisfies the antenna selection criteria.

Correspondingly, after receiving the first information, the terminal device can determine the target antenna group, and then perform uplink transmission through the target antenna group.

According to the above content, in the antenna selection method provided by the embodiment of the present application, the terminal device sends the target signal to the access network device, the access network device determines the target antenna group based on the target signal, and sends the target antenna group to the terminal device to Causes the end device to perform uplink transmission through the target antenna group. In this method, as shown in FIG. 6 , it can be seen that the signal transmission between the terminal device and the access network device forms a closed loop. Therefore, this method can also be called a closed-loop antenna method.

Further, since the access network device not only selects the target antenna group based on RSRP, but also can select the target antenna group based on various other target parameters, such as selecting the target antenna group based on the path loss value, channel capacity or channel estimation matrix, and The path loss value, channel capacity and channel estimation matrix can reflect the mutual interference between channels, so as to obtain the correlation between channels. Therefore, the antenna selection method provided by the embodiment of the present application can also ensure that the target antenna group with the best performance can still be selected under coherent codebook transmission.

In addition, the antenna selection method provided in the embodiments of the present application is applicable to all terminal devices, has good universality, and can be applied to terminal devices with nTmR; and can be applied to far-point users as well as near-point users.

To sum up, in the embodiments of the present application, the access network device may select and configure the terminal device's maximum antenna selection capability in combination with the antenna selection capability report of the terminal device, the selection criteria of the target antenna group, and the delivery method of the target antenna group. Excellent uplink antenna group.

The antenna selection method provided by the embodiment of the present application is described below for the 1T4R terminal equipment and the 2T4R terminal equipment, respectively, taking the target parameter as the path loss value, the target signal as the SRS, and the access network equipment as the base station.

For example, for a 1T4R terminal device, the terminal device includes 4 antenna groups, and each antenna group has only one antenna. After acquiring the information indicating that the terminal device supports the antenna selection capability from the terminal device, the base station will determine the target antenna group based on the SRS from the terminal device. Since there is only one antenna in each antenna group for a 1T4R terminal device, the antenna group can also be called an antenna, and the target antenna group can also be called a target antenna.

The specific process for the base station to determine the target antenna is as follows: after the base station obtains information from the terminal equipment indicating that the terminal equipment supports the antenna selection capability, the base station configures the L1 layer to perform RSRP measurement. In a statistical period, the base station measures the RSRP of each of the four antennas according to the SRS received each time. The L1 layer sends the measured RSRP to the L2 layer. The L2 layer calculates the path loss value corresponding to each antenna based on RSRP, adds 1 to the weight of the antenna corresponding to the minimum path loss value, and if the difference between the path loss value of the uplink antenna determined last time and the minimum path loss value is less than or If it is equal to 0.5dB, the weight of the uplink antenna determined last time is also increased by 1, and the weights of other antennas remain unchanged. It is assumed that the uplink antenna determined by the base station last time is antenna 0. In this statistical period, if there is antenna 1 in the four antennas, and the difference between the weight of antenna 1 and the weight of antenna 0 is greater than or equal to a preset value, such as 1, the base station determines antenna 1 as the target antenna this time. . Otherwise, the base station still determines antenna 0 as the target antenna.

For another example, for a 2T4R terminal device, the terminal device includes 6 antenna groups, and each antenna group has only 2 antennas. After acquiring the information indicating that the terminal device supports the antenna selection capability from the terminal device, the base station will determine the target antenna group based on the SRS from the terminal device.

The specific process for the base station to determine the target antenna group is as follows: after the base station obtains information from the terminal equipment indicating that the terminal equipment supports the antenna selection capability, the base station configures the L1 layer to perform RSRP measurement. Within a statistical period, the base station measures the RSRP of each of the six antenna groups according to the SRS received each time. The L1 layer sends the measured RSRP to the L2 layer. The L2 layer calculates the path loss value corresponding to each antenna group based on RSRP, adds 1 to the weight of the antenna group corresponding to the minimum path loss value, and if the difference between the path loss value of the last determined uplink antenna group and the minimum path loss value If the value is less than or equal to 0.5dB, the weight of the uplink antenna group determined last time is also increased by 1, and the weights of other antenna groups remain unchanged. It is assumed that the uplink antenna group determined by the base station last time is antenna group 1. In this statistical period, if there is antenna group 2 in the 6 antenna groups, and the difference between the weight of antenna group 2 and the weight of antenna group 1 is greater than or equal to the preset value, such as 1, the base station will use the antenna group this time. 2 is determined as the target antenna group. Otherwise, the base station still determines antenna group 1 as the target antenna group.

The antenna selection method according to the embodiment of the present application is mainly described above, and the following describes the communication device provided by the embodiment of the present application for executing the above method. Those skilled in the art can understand that the methods and apparatuses can be combined and referenced with each other, and the communication apparatus provided by the embodiments of the present application can perform the steps performed by the terminal device or the access network device in the above antenna selection method.

For example, in the case of dividing each functional module in an integrated manner, FIG. 7 shows a schematic structural diagram of a communication device 70 . The communication device 70 includes: a transceiver module 701 and a processing module 702 .

In some embodiments, the communication apparatus 70 is an access network device or is located on an access network device, and the transceiver module 701 may be configured to support the communication apparatus 70 to perform step 404 shown in FIG. 4 in the foregoing embodiments. The processing module 702 may be configured to support the communication apparatus 70 to perform step 403 shown in FIG. 4 in the above embodiment, steps 403a, 403b and 403c shown in FIG. 5, and/or other steps performed by the terminal device in the above method embodiments or Features. The transceiver module 701 and the processing module 702 are further configured to support the communication apparatus 70 to perform other steps or functions performed by the access network equipment in the above method embodiments.

In other embodiments, the communication apparatus 70 is a terminal device or is located on the terminal device, and the transceiver module 701 may be used to support the communication apparatus 70 to perform steps 401 and 402 shown in FIG. 4 in the above embodiments, and/or the above Other steps or functions performed by the terminal device in the method embodiment. Thus, the second information and the target signal are sent to the access network device.

Wherein, all relevant contents of the steps involved in the above method embodiments can be cited in the functional descriptions of the corresponding functional modules, which will not be repeated here.

In the embodiment of the present application, the communication apparatus 70 is presented in the form of dividing each functional module in an integrated manner. "Module" herein may refer to a specific ASIC, circuit, processor and memory executing one or more software or firmware programs, integrated logic circuit, and/or other device that may provide the functions described above. In a simple embodiment, those skilled in the art can imagine that the communication device 70 can take the form shown in FIG. 2 .

For example, the processor 201 in FIG. 2 can cause the communication apparatus 70 to perform the actions performed by the terminal device or the access network device in the foregoing method embodiments by invoking the computer instructions stored in the memory 203 .

Specifically, the functions/implementation process of the transceiver module 701 and the processing module 702 in FIG. 7 may be implemented by the processor 201 in FIG. 2 calling computer instructions stored in the memory 203 . Alternatively, the function/implementation process of the transceiver module 701 in FIG. 7 can be implemented through the communication interface 204 in FIG. 2 , and the function/implementation process of the processing module 702 in FIG. 7 can be implemented through the processor 201 in FIG. 2 to call the memory 203 computer instructions stored in it.

Optionally, the embodiments of the present application further provide a computer-readable storage medium, where computer instructions are stored in the computer-readable storage medium, and when the computer instructions are executed on the communication device, the communication device is made to execute the above-mentioned related methods. The steps implement the antenna selection method in the above embodiment. For example, the communication apparatus may be the terminal device in the foregoing method embodiment. Alternatively, the communication apparatus may be the access network device in the foregoing method embodiment.

Optionally, the embodiments of the present application further provide a computer program product, which, when running on a computer, causes the computer to execute the above-mentioned relevant steps, so as to implement the antenna selection method executed by the communication device in the above-mentioned embodiment. For example, the communication apparatus may be the terminal device in the foregoing method embodiment. Alternatively, the communication apparatus may be the access network device in the foregoing method embodiment.

Optionally, the embodiments of the present application further provide an apparatus, and the apparatus may specifically be a chip, a component, a module, or a system on a chip. The device may include a processor and a memory connected together; wherein the memory is used for storing computer instructions, and when the device is running, the processor can execute the computer instructions stored in the memory, so that the chip executes the antenna executed by the communication device in the above method embodiments Method of choosing. For example, the communication apparatus may be the terminal device in the foregoing method embodiment. Alternatively, the communication apparatus may be the access network device in the foregoing method embodiment.

Optionally, an embodiment of the present application further provides an antenna selection system, where the antenna selection system includes a terminal device and an access network device. The terminal equipment and the access network equipment in the antenna selection system system can respectively execute the antenna selection methods performed by the terminal equipment and the access network equipment in the foregoing embodiments.

The communication device, computer-readable storage medium, computer program product, chip or system-on-chip provided by the embodiments of the present application are all used to execute the corresponding methods provided above. Therefore, for the beneficial effects that can be achieved, please refer to the above The beneficial effects in the corresponding method provided in this article will not be repeated here.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. Computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server, or data center over a wire (e.g. Coaxial cable, optical fiber, digital subscriber line (DSL) or wireless (such as infrared, wireless, microwave, etc.) means to transmit to another website site, computer, server or data center. Computer-readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc., that can be integrated with the media. Useful media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, DVD), or semiconductor media (eg, solid state disk (SSD)), and the like.

Although the application is described herein in conjunction with various embodiments, in practicing the claimed application, those skilled in the art can understand and implement the disclosure by reviewing the drawings, the disclosure, and the appended claims Other variations of the embodiment. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that these measures cannot be combined to advantage.

Although the application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined by the appended claims, and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of this application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

An antenna selection method, applied to access network equipment, characterized in that the method includes:

A target antenna group is determined based on a target signal from a terminal device, the terminal device including a plurality of antenna groups, each of the antenna groups including an antenna or a combination of antennas, the target antenna group being used for the terminal device send an uplink signal;

Send first information to the terminal device, where the first information is used to indicate the target antenna group.
The method according to claim 1, wherein the method further comprises:

Acquire second information from the terminal device, where the second information is used to indicate that the terminal device supports the antenna selection capability.
The method according to claim 1 or 2, wherein the determining the target antenna group based on the target signal from the terminal device comprises:

calculating the target parameter of each uplink antenna group in the plurality of uplink antenna groups based on the target signal from the terminal device;

Calculate the weight of each uplink antenna group in the multiple uplink antenna groups according to the target parameter;

The target antenna group is determined according to the weight of each uplink antenna group in the plurality of uplink antenna groups.
The method according to claim 3, wherein the target parameter comprises one or more of the following: reference signal received power (RSRP), channel capacity, path loss value or channel estimation matrix;

The target antenna group satisfies one or more of the following preset conditions: maximum reference signal received power RSRP, maximum channel capacity, minimum path loss value, or minimum channel correlation within the antenna group.
The method according to claim 3 or 4, wherein the weight of each uplink antenna group in the multiple uplink antenna groups determines the target antenna group, comprising:

If there is a first antenna group in the multiple antenna groups, so that the difference between the weight of the first antenna group and the weight of the second antenna group is greater than or equal to the target preset value, the second antenna group is the last determined uplink antenna group, then determine that the first antenna group is the target antenna group;

Otherwise, the second antenna group is determined to be the target antenna group.
The method according to claim 5, wherein the target parameter comprises RSRP, and the calculating the weight of each uplink antenna group in the plurality of uplink antenna groups according to the target parameter comprises:

For the RSRP of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the largest RSRP, and if the If the difference between the RSRP of the second antenna group and the maximum RSRP is less than or equal to the first preset value, then add 1 to the weight of the second antenna group, and the weights of other antenna groups remain unchanged .
The method according to claim 5, wherein the target parameter includes a channel capacity, and the calculating the weight of each uplink antenna group in the plurality of uplink antenna groups according to the target parameter comprises:

For the channel capacity of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the maximum channel capacity, and If the difference between the channel capacity of the second antenna group and the maximum channel capacity is less than or equal to a second preset value, add 1 to the weight of the second antenna group, and add 1 to the weight of the other antenna groups. The weight remains unchanged.
The method according to claim 5, wherein the target parameter comprises a path loss value, and the calculating the weight of each uplink antenna group in the plurality of uplink antenna groups according to the target parameter comprises:

For the path loss value of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the minimum path loss value, and if the If the difference between the path loss value of the second antenna group and the minimum path loss value is less than or equal to the third preset value, then add 1 to the weight of the second antenna group, and the weights of other antenna groups remain unchanged .
The method according to claim 5, wherein the target parameter comprises a channel estimation matrix, and the calculating the weight of each uplink antenna group in the plurality of uplink antenna groups according to the target parameter comprises:

For the channel estimation matrix of each of the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the channel estimation matrix with the largest rank , and if the difference between the target antenna group of the second antenna group and the antenna group corresponding to the channel estimation matrix with the largest rank is less than or equal to a fourth preset value, the weight of the second antenna group is The value is increased by 1, and the weights of other antenna groups remain unchanged.
The method according to any one of claims 1-9, wherein the target signal comprises a channel sounding reference signal SRS or a demodulation reference signal DMRS.
The method according to any one of claims 1-10, wherein the first information comprises downlink control information DCI, medium intervention control control element MAC CE or radio resource control RRC signaling.
The method according to any one of claims 1-11, wherein the second information includes uplink control information UCI, medium access control control element MAC CE or radio resource control RRC signaling.
An antenna selection method, applied to a terminal device, the terminal device includes multiple antenna groups, each of the antenna groups includes one antenna or a combination of multiple antennas, wherein the method includes:

sending second information to the access network device, where the second information is used to indicate that the terminal device supports the antenna selection capability;

sending a target signal to the access network device;

Receive first information from the access network device, where the first information is used to indicate a target antenna group, and the target antenna group is used for the terminal device to send an uplink signal.
A communication device, comprising a transceiver module and a processing module:

The processing module is configured to: determine a target antenna group based on a target signal from a terminal device, the terminal device includes multiple antenna groups, each of the antenna groups includes one antenna or a combination of multiple antennas, the The target antenna group is used for the terminal device to send an uplink signal;

The processing module is further configured to: send first information to the terminal device through the transceiver module, where the first information is used to indicate the target antenna group.
The apparatus according to claim 14, wherein the processing module is further configured to:

Obtain second information from the terminal device through the transceiver module, where the second information is used to indicate that the terminal device supports the antenna selection capability.
The device according to claim 14 or 15, wherein the processing module is further configured to:

Calculate the target parameter of each uplink antenna group in the plurality of uplink antenna groups based on the target signal from the terminal device;

Calculate the weight of each uplink antenna group in the multiple uplink antenna groups according to the target parameter;

The target antenna group is determined according to the weight of each uplink antenna group in the plurality of uplink antenna groups.
The apparatus according to claim 16, wherein the target parameter comprises one or more of the following: reference signal received power (RSRP), channel capacity, path loss value or channel estimation matrix;

The target antenna group satisfies one or more of the following preset conditions: maximum reference signal received power RSRP, maximum channel capacity, minimum path loss value, or minimum channel correlation within the antenna group.
The device according to claim 16 or 17, wherein the processing module is further configured to:

If there is a first antenna group in the multiple antenna groups, so that the difference between the weight of the first antenna group and the weight of the second antenna group is greater than or equal to the target preset value, the second antenna group is the last determined uplink antenna group, then determine that the first antenna group is the target antenna group;

Otherwise, the second antenna group is determined to be the target antenna group.
The device according to claim 18, wherein the processing module is further configured to:

For the RSRP of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the largest RSRP, and if the first The difference between the RSRP of the two antenna groups and the maximum RSRP is less than or equal to the first preset value, then the weight of the second antenna group is increased by 1, and the weights of other antenna groups remain unchanged.
The device according to claim 18, wherein the processing module is further configured to:

For the channel capacity of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the largest channel capacity, and if all If the difference between the channel capacity of the second antenna group and the maximum channel capacity is less than or equal to a second preset value, then add 1 to the weight of the second antenna group, and the weights of other antenna groups constant.
The device according to claim 18, wherein the processing module is further configured to:

For the path loss value of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the minimum path loss value, and if the first The difference between the path loss value of the two antenna groups and the minimum path loss value is less than or equal to the third preset value, then the weight of the second antenna group is increased by 1, and the weights of other antenna groups remain unchanged.
The device according to claim 18, wherein the processing module is further configured to:

For the channel estimation matrix of each antenna group in the multiple antenna groups calculated and obtained according to the target signal each time in a statistical period, add 1 to the weight of the antenna group corresponding to the channel estimation matrix with the largest rank, and If the difference between the target antenna group of the second antenna group and the antenna group corresponding to the channel estimation matrix with the largest rank is less than or equal to a fourth preset value, add the weight of the second antenna group to 1. The weights of other antenna groups remain unchanged.
The apparatus according to any one of claims 14-22, wherein the target signal comprises a channel sounding reference signal SRS or a demodulation reference signal DMRS.
The apparatus according to any one of claims 14-23, wherein the first information comprises downlink control information DCI, medium intervention control control element MAC CE or radio resource control RRC signaling.
The apparatus according to any one of claims 14-24, wherein the second information includes uplink control information UCI, medium intervention control control element MAC CE or radio resource control RRC signaling.
A communication device, characterized in that it includes a transceiver module and a processing module:

The processing module is configured to: send second information to the access network device through the transceiver module, where the second information is used to instruct the communication apparatus to support the antenna selection capability;

The processing module is further configured to: send a target signal to the access network device through the transceiver module;

The processing module is further configured to: receive first information from the access network device through the transceiver module, where the first information is used to indicate a target antenna group, and the target antenna group is used for sending by the communication device up signal.
A communication device, comprising: a processor and a memory; wherein, the memory is used to store computer instructions, and when the communication device operates, the processor executes the computer instructions stored in the memory, A method as claimed in any one of claims 1-12, or a method as claimed in claim 13 is implemented.
An antenna selection system, characterized by comprising the communication device according to any one of claims 14-25, and the communication device according to claim 26.
A computer-readable storage medium, characterized by comprising computer instructions, which, when the computer instructions are executed on a computer or a processor, cause the computer or the processor to perform any one of claims 1-13. Antenna selection method described above.
A computer program product, characterized in that, when the computer program product runs on a computer or a processor, the computer or the processor is made to execute the antenna selection method according to any one of claims 1-13 .