Communication method and apparatus

Abstract

The present application provides a communication method and apparatus, which are capable of achieving consistency between an uplink channel and a downlink channel. The method comprises: a network device uses a first precoding matrix to respectively send a first reference signal and a second reference signal, and a terminal device uses a second precoding matrix to respectively receive the first reference signal and the second reference signal; the terminal device uses the second precoding matrix to respectively send a third reference signal and a fourth reference signal, and the network device uses the first precoding matrix to respectively receive the third reference signal and the fourth reference signal, a weight used by an element of a reflecting device when the first reference signal and the third reference signal are transmitted being the opposite of a weight used by an element of the reflecting device when the second reference signal and the fourth reference signal are transmitted; the terminal device sends, to the network device, first information comprising the first reference signal and the second reference signal received by the terminal device; and the network device sends second information to the reflecting device, the second information indicating the ratio of a first power amplification factor to a second power amplification factor.

Description

Method and apparatus of communication

[0001] This application claims priority to the Chinese patent application No. 202411046392.5, filed on July 31, 2024, and entitled "Method and apparatus of communication", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and more particularly, to a method and apparatus of communication. BACKGROUND

[0003] An active reconfigurable intelligent surface (RIS) is an array surface composed of multiple weight-adjustable elements and power amplifiers (PAs) for uplink and downlink reflection respectively; the active RIS includes A surface and B surface, one surface of the active RIS is used for communication with a base station, and the other surface is used for communication with a terminal device. In addition, the active RIS is also equipped with a mobile terminal for receiving control signaling of the base station, and the base station can adjust the weight of each element by sending signaling to the active RIS, so as to reflect the received signal at the active RIS to the desired direction, to realize functions such as channel enhancement and channel rank enhancement in weak coverage areas.

[0004] Generally, the line-of-sight (LOS) path of the direct signal from the base station to the terminal device will be blocked by buildings and the like, and in the absence of the active RIS, the signal transmitted by the base station can only reach the terminal device through the non-line-of-sight (NLOS) path, and the received signal at the terminal device is weak. After deploying the active RIS, the base station can reasonably adjust the weights of the elements of the active RIS and the power of the PA to form a beam, and construct a stronger path on the base station-active RIS-terminal device path, thereby realizing coverage enhancement in weak coverage areas.

[0005] Since the uplink PA and the downlink PA of the active RIS are different, it is difficult for the uplink PA and the downlink PA to maintain the same power amplification factor and phase rotation coefficient during uplink channel transmission and downlink channel transmission; in addition, the powers of the signals received by the active RIS during uplink transmission and downlink transmission are different, causing the uplink PA and the downlink PA to work in different regions, even if the uplink PA and the downlink PA are the same PA, they cannot maintain the same amplification factor under the same parameter setting. Therefore, the uplink channel and the downlink channel of the base station-active RIS-terminal device are inconsistent / non-reciprocal, and the base station cannot estimate the downlink channel by receiving the reference signal sent by the terminal device. SUMMARY

[0006] The application provides a method and device for communication, which can realize consistency of uplink and downlink channels of a network device, a reflector and a terminal device.

[0007] In a first aspect, a method for communication is provided, which can be executed by a network device or a chip or chip system in the network device. The method comprises: the network device respectively transmits a first reference signal and a second reference signal using a first precoding matrix, an array element of a reflector uses a first weight value in a process of transmitting the first reference signal, and uses a second weight value in a process of transmitting the second reference signal, the first weight value being an opposite number of the second weight value; the network device respectively receives a third reference signal and a fourth reference signal transmitted by a terminal device using a second precoding matrix, the array element of the reflector uses the first weight value in a process of transmitting the third reference signal, and uses the second weight value in a process of transmitting the fourth reference signal; the network device receives first information from the terminal device, the first information comprising the first reference signal and the second reference signal respectively received by the terminal device using the second precoding matrix; and the network device transmits second information to the reflector, the second information indicating a ratio of a first power amplification factor of the reflector in uplink transmission to a second power amplification factor of the reflector in downlink transmission, for the reflector to adjust the first power amplification factor and / or the second power amplification factor, the ratio of the first power amplification factor to the second power amplification factor being determined according to the first information, the third reference signal and the fourth reference signal received.

[0008] Based on the above technical solution, the network device can determine the ratio of the first power amplification factor of the reflector in uplink transmission to the second power amplification factor of the reflector in downlink transmission according to the first reference signal and the second reference signal respectively received by the terminal device using the second precoding matrix, and the third reference signal and the fourth reference signal respectively received by the network device using the first precoding matrix, and transmit second information indicating the ratio of the first power amplification factor to the second power amplification factor to the reflector; the reflector can adjust the first power amplification factor and / or the second power amplification factor according to the ratio of the first power amplification factor to the second power amplification factor indicated by the second information, so that the adjusted first power amplification factor is the same as the second power amplification factor, thereby realizing consistency of uplink and downlink channels of the network device, the reflector and the terminal device.

[0009] With reference to the first aspect, in some implementations of the first aspect, the method further includes: determining, by the network device, the ratio of the first power amplification factor to the second power amplification factor according to the first information, the received third reference signal and the received fourth reference signal.

[0010] With reference to the first aspect, in some implementations of the first aspect, the first reference signal comprises a first CSI-RS, and the second reference signal comprises a second CSI-RS; the third reference signal comprises a first sounding reference signal (SRS), and the fourth reference signal comprises a second SRS.

[0011] With reference to the first aspect, in some implementations of the first aspect, the first information further includes CSI-RS resource indexes and SRS resource indexes corresponding to the first CSI-RS received by the terminal device, and CSI-RS resource indexes and SRS resource indexes corresponding to the second CSI-RS received by the terminal device.

[0012] With reference to the first aspect, in some implementations of the first aspect, the method further includes: sending, by the network device, configuration information to the terminal device, the configuration information indicating resources for sending the first reference signal, the second reference signal, the third reference signal and the fourth reference signal, and resource indexes of the resources.

[0013] The second aspect provides a method of communication, which can be executed by a terminal device or a chip or chip system in the terminal device. The method includes: receiving, by the terminal device, a first reference signal and a second reference signal sent by a network device using a first precoding matrix using a second precoding matrix, the weight used by an array element of a reflecting device in transmitting the first reference signal being a first weight, the weight used by the array element of the reflecting device in transmitting the second reference signal being a second weight, the first weight being the opposite of the second weight; sending, by the terminal device, a third reference signal and a fourth reference signal using the second precoding matrix, the weight used by the array element of the reflecting device in transmitting the third reference signal being the first weight, the weight used by the array element of the reflecting device in transmitting the fourth reference signal being the second weight; and sending, by the terminal device, first information to the network device, the first information including the first reference signal and the second reference signal received using the second precoding matrix, for the network device to determine the ratio of a first power amplification factor of the reflecting device in uplink transmission to a second power amplification factor of the reflecting device in downlink transmission.

[0014] The method provided by the second aspect is a terminal device side method corresponding to the first aspect, and the beneficial effects can be referred to the first aspect.

[0015] With reference to the second aspect, in some implementations of the second aspect, the first reference signal comprises a first CSI-RS, the second reference signal comprises a second CSI-RS; the third reference signal comprises a first SRS, and the fourth reference signal comprises a second SRS.

[0016] With reference to the second aspect, in some implementations of the second aspect, the first information further comprises CSI-RS resource indices and SRS resource indices corresponding to the received first CSI-RS and the received second CSI-RS.

[0017] With reference to the second aspect, in some implementations of the second aspect, the method further comprises: receiving, by the terminal device, configuration information from the network device, the configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indices of the resources.

[0018] In a third aspect, a method of communication is provided that can be performed by a network device or a chip or chip system in the network device. The method includes: the network device transmitting, using a first precoding matrix, a first reference signal and a second reference signal respectively, a weight used by an element of a reflector device during transmission of the first reference signal being a first weight, a weight used by the element of the reflector device during transmission of the second reference signal being a second weight, the first weight being an opposite number of the second weight; the network device receiving, using the first precoding matrix, a third reference signal and a fourth reference signal transmitted by a terminal device using a second precoding matrix respectively, a weight used by the element of the reflector device during transmission of the third reference signal being the first weight, a weight used by the element of the reflector device during transmission of the fourth reference signal being the second weight; the network device sending, to the terminal device, third information, the third information including the third reference signal and the fourth reference signal received respectively using the first precoding matrix; the network device receiving, from the terminal device, fourth information indicating a ratio of a first power amplification factor of the reflector device in uplink transmission to a second power amplification factor of the reflector device in downlink transmission, the ratio of the first power amplification factor to the second power amplification factor being determined by the terminal device according to the third information and the first reference signal and the second reference signal received by the terminal device using the second precoding matrix respectively; and the network device sending, to the reflector device, second information indicating the ratio of the first power amplification factor to the second power amplification factor, for the reflector device to adjust the first power amplification factor and / or the second power amplification factor.

[0019] Based on the above technical solution, the terminal device can determine the ratio of the first power amplification factor of the reflector device in uplink transmission to the second power amplification factor of the reflector device in downlink transmission according to the first reference signal and the second reference signal received by the terminal device using the second precoding matrix respectively and the third reference signal and the fourth reference signal received by the network device, and send, to the network device, fourth information indicating the ratio of the first power amplification factor to the second power amplification factor; the network device sends, to the reflector device, second information indicating the ratio of the first power amplification factor to the second power amplification factor; and the reflector device can adjust the first power amplification factor and / or the second power amplification factor according to the ratio of the first power amplification factor to the second power amplification factor indicated by the second information, so that the adjusted first power amplification factor and the second power amplification factor are the same, thereby achieving consistency of uplink and downlink channels of the network device- reflector device-terminal device.

[0020] In some implementations of the third aspect, in combination with the third aspect, the first reference signal comprises a first CSI-RS, and the second reference signal comprises a second CSI-RS; the third reference signal comprises a first SRS, and the fourth reference signal comprises a second SRS.

[0021] In some implementations of the third aspect, in combination with the third aspect, the third information further comprises a CSI-RS resource index and an SRS resource index corresponding to the received first SRS, and a CSI-RS resource index and an SRS resource index corresponding to the received second SRS.

[0022] In some implementations of the third aspect, in combination with the third aspect, the method further comprises: sending, by the network device, configuration information to the terminal device, the configuration information indicating resources for sending the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indexes of the resources.

[0023] In the fourth aspect, a method of communication is provided, which can be executed by a terminal device or a chip or chip system in a terminal device. The method comprises: receiving, by the terminal device, a first reference signal and a second reference signal sent by a network device using a first precoding matrix, respectively, using a second precoding matrix, the weight used by an array element of a reflecting device in the process of transmitting the first reference signal being a first weight, the weight used by the array element of the reflecting device in the process of transmitting the second reference signal being a second weight, the first weight being the opposite of the second weight; sending, by the terminal device, a third reference signal and a fourth reference signal using the second precoding matrix, respectively, the weight used by the array element of the reflecting device in the process of transmitting the third reference signal being the first weight, the weight used by the array element of the reflecting device in the process of transmitting the fourth reference signal being the second weight; receiving, by the terminal device, third information from the network device, the third information comprising the third reference signal and the fourth reference signal received by the network device using the first precoding matrix, respectively; and sending, by the terminal device, fourth information to the network device, the fourth information indicating a ratio of a first power amplification factor of the reflecting device in uplink transmission to a second power amplification factor of the reflecting device in downlink transmission, the ratio of the first power amplification factor to the second power amplification factor being determined according to the third information, the first reference signal and the second reference signal received using the second precoding matrix, respectively.

[0024] The method provided in the fourth aspect is a terminal device side method corresponding to the third aspect, and the beneficial effects can refer to the third aspect.

[0025] With reference to the fourth aspect, in some implementations of the fourth aspect, the method further includes: determining, by the terminal device, the ratio of the first power amplification factor to the second power amplification factor according to the third information, the received first reference signal and the received second reference signal.

[0026] With reference to the fourth aspect, in some implementations of the fourth aspect, the first reference signal includes a first CSI-RS, and the second reference signal includes a second CSI-RS; the third reference signal includes a first SRS, and the fourth reference signal includes a second SRS.

[0027] With reference to the fourth aspect, in some implementations of the fourth aspect, the third information further includes a CSI-RS resource index and an SRS resource index corresponding to the first SRS received by the network device, and a CSI-RS resource index and an SRS resource index corresponding to the second SRS received by the network device.

[0028] With reference to the fourth aspect, in some implementations of the fourth aspect, the method further includes: receiving, by the terminal device, configuration information from the network device, the configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indexes of the resources.

[0029] In a fifth aspect, a communication apparatus is provided, which can be applied in the network device of the first aspect. The apparatus comprises: a transceiver configured to transmit a first reference signal and a second reference signal using a first precoding matrix respectively, wherein the weights used by the array elements of the reflecting device in transmitting the first reference signal are first weights, and the weights used by the array elements of the reflecting device in transmitting the second reference signal are second weights, the first weights being the opposite of the second weights; the transceiver is further configured to receive a third reference signal and a fourth reference signal transmitted by a terminal device using a second precoding matrix respectively using the first precoding matrix, wherein the weights used by the array elements of the reflecting device in transmitting the third reference signal are the first weights, and the weights used by the array elements of the reflecting device in transmitting the fourth reference signal are the second weights; the transceiver is further configured to receive first information from the terminal device, the first information comprising the first reference signal and the second reference signal received by the terminal device using the second precoding matrix respectively; the transceiver is further configured to send second information to the reflecting device, the second information indicating a ratio of a first power amplification factor of the reflecting device in uplink transmission to a second power amplification factor of the reflecting device in downlink transmission, for the reflecting device to adjust the first power amplification factor and / or the second power amplification factor, the ratio of the first power amplification factor to the second power amplification factor being determined according to the first information, the received third reference signal and the received fourth reference signal.

[0030] With reference to the fifth aspect, in some implementations of the fifth aspect, the communication apparatus further comprises a processing module configured to determine the ratio of the first power amplification factor to the second power amplification factor according to the first information, the received third reference signal and the received fourth reference signal.

[0031] With reference to the fifth aspect, in some implementations of the fifth aspect, the first reference signal comprises a first channel state information reference signal (CSI-RS), and the second reference signal comprises a second CSI-RS; the third reference signal comprises a first sounding reference signal (SRS), and the fourth reference signal comprises a second SRS.

[0032] With reference to the fifth aspect, in some implementations of the fifth aspect, the first information further comprises a CSI-RS resource index and an SRS resource index corresponding to the first CSI-RS received by the terminal device, and a CSI-RS resource index and an SRS resource index corresponding to the second CSI-RS received by the terminal device.

[0033] With reference to the fifth aspect, in some implementations of the fifth aspect, the transceiver is further configured to send, to the terminal device, configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indices of the resources.

[0034] With reference to the sixth aspect, in some implementations of the sixth aspect, the first reference signal comprises a first CSI-RS, and the second reference signal comprises a second CSI-RS; the third reference signal comprises a first sounding reference signal (SRS), and the fourth reference signal comprises a second SRS.

[0035] With reference to the sixth aspect, in some implementations of the sixth aspect, the first information further comprises CSI-RS resource indices and SRS resource indices corresponding to the received first CSI-RS and the received second CSI-RS.

[0036] With reference to the sixth aspect, in some implementations of the sixth aspect, the first information further comprises CSI-RS resource indices and SRS resource indices corresponding to the received first CSI-RS and the received second CSI-RS.

[0037] With reference to the sixth aspect, in some implementations of the sixth aspect, the transceiver is further configured to receive, from the network device, configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indices of the resources.

[0038] In a seventh aspect, a communication apparatus is provided, which can be applied in the network device of the third aspect, and the apparatus includes: a transceiver configured to transmit a first reference signal and a second reference signal using a first precoding matrix respectively, wherein a weight used by an array element of a reflecting device during transmission of the first reference signal is a first weight, and a weight used by the array element of the reflecting device during transmission of the second reference signal is a second weight, and the first weight is an opposite number of the second weight; the transceiver is further configured to receive a third reference signal and a fourth reference signal transmitted by a terminal device using a second precoding matrix respectively using the first precoding matrix, wherein a weight used by the array element of the reflecting device during transmission of the third reference signal is the first weight, and a weight used by the array element of the reflecting device during transmission of the fourth reference signal is the second weight; the transceiver is further configured to send third information to the terminal device, wherein the third information includes the third reference signal and the fourth reference signal received using the first precoding matrix respectively; the transceiver is further configured to receive fourth information from the terminal device, wherein the fourth information indicates a ratio of a first power amplification factor of the reflecting device in uplink transmission to a second power amplification factor of the reflecting device in downlink transmission, and the ratio of the first power amplification factor to the second power amplification factor is determined by the terminal device according to the third information and the first reference signal and the second reference signal received by the terminal device using the second precoding matrix respectively; and the transceiver is further configured to send second information to the reflecting device, wherein the second information indicates the ratio of the first power amplification factor to the second power amplification factor, and is used by the reflecting device to adjust the first power amplification factor and / or the second power amplification factor.

[0039] With reference to the seventh aspect, in some implementations of the seventh aspect, the first reference signal includes a first CSI-RS, and the second reference signal includes a second CSI-RS; the third reference signal includes a first SRS, and the fourth reference signal includes a second SRS.

[0040] With reference to the seventh aspect, in some implementations of the seventh aspect, the third information further includes a CSI-RS resource index and an SRS resource index corresponding to the received first SRS, and a CSI-RS resource index and an SRS resource index corresponding to the received second SRS.

[0041] With reference to the seventh aspect, in some implementations of the seventh aspect, the transceiver is further configured to send configuration information to the terminal device, wherein the configuration information indicates resources used for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indexes of the resources.

[0042] In an eighth aspect, a communication apparatus is provided, which can be applied in the terminal device of the fourth aspect. The apparatus comprises: a transceiver configured to receive, using a second precoding matrix, a first reference signal and a second reference signal transmitted by a network device using a first precoding matrix, wherein a weight used by an array element of a reflecting device during transmission of the first reference signal is a first weight, and a weight used by the array element of the reflecting device during transmission of the second reference signal is a second weight, the first weight being an opposite number of the second weight; the transceiver is further configured to transmit, using the second precoding matrix, a third reference signal and a fourth reference signal, wherein a weight used by the array element of the reflecting device during transmission of the third reference signal is the first weight, and a weight used by the array element of the reflecting device during transmission of the fourth reference signal is the second weight; the transceiver is further configured to receive, from the network device, third information, the third information comprising the third reference signal and the fourth reference signal received by the network device using the first precoding matrix; and the transceiver is further configured to send, to the network device, fourth information indicating a ratio of a first power amplification factor of the reflecting device in uplink transmission to a second power amplification factor of the reflecting device in downlink transmission, the ratio of the first power amplification factor to the second power amplification factor being determined according to the third information, the first reference signal and the second reference signal received using the second precoding matrix.

[0043] With reference to the eighth aspect, in some implementations of the eighth aspect, the apparatus further comprises a processing module configured to determine the ratio of the first power amplification factor to the second power amplification factor according to the third information, the received first reference signal and the received second reference signal.

[0044] With reference to the eighth aspect, in some implementations of the eighth aspect, the first reference signal comprises a first CSI-RS, and the second reference signal comprises a second CSI-RS; the third reference signal comprises a first SRS, and the fourth reference signal comprises a second SRS.

[0045] With reference to the eighth aspect, in some implementations of the eighth aspect, the third information further comprises a CSI-RS resource index and an SRS resource index corresponding to the first SRS received by the network device, and a CSI-RS resource index and an SRS resource index corresponding to the second SRS received by the network device.

[0046] In a seventh aspect, in some implementations of the eighth aspect, the transceiver is further configured to receive configuration information from the network device, the configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indices of the resources.

[0047] A ninth aspect provides a communication apparatus, including a processor configured to implement a method in accordance with the first aspect to the fourth aspect or any possible implementation of the first aspect to the fourth aspect. Optionally, the communication apparatus further includes an interface circuitry configured to receive a signal from another communication apparatus and transmit it to the processor or send a signal from the processor to another communication apparatus.

[0048] A tenth aspect provides a communication system including a network device configured to implement a method in accordance with the first aspect, and a terminal device configured to implement a method in accordance with the second aspect, or a network device configured to implement a method in accordance with the third aspect, and a terminal device configured to implement a method in accordance with the fourth aspect.

[0049] An eleventh aspect provides a computer readable storage medium storing a computer program; the computer program, when executed by a processor, causing the method in the first aspect to the fourth aspect and any possible implementation of the first aspect to the fourth aspect to be performed.

[0050] A twelfth aspect provides a computer program product including a computer program that, when executed, causes the method in the first aspect to the fourth aspect and any possible implementation of the first aspect to the fourth aspect to be performed.

[0051] The solutions provided by the fifth aspect to the twelfth aspect are used to implement or assist in implementing the methods provided by the first aspect to the fourth aspect, and thus can achieve the same or corresponding beneficial effects as the first aspect to the fourth aspect. Therefore, no further elaboration is made here. BRIEF DESCRIPTION OF DRAWINGS

[0052] FIG. 1 is a schematic diagram of a network architecture to which embodiments of the present application are applicable.

[0053] FIG. 2 is a schematic diagram of a chip system architecture to which embodiments of the present application are applicable.

[0054] FIG. 3 is a schematic diagram of a structure of an active RIS.

[0055] FIG. 4 is a schematic diagram of an application scenario of an active RIS in a live network.

[0056] FIG. 5 is a schematic diagram of a working principle of an active RIS.

[0057] FIG. 6 is a schematic flow interaction diagram of a method of communication according to an embodiment of the present application.

[0058] FIG. 7 is a schematic diagram of uplink and downlink channels for a base station-active RIS-terminal device.

[0059] FIG. 8 is a flow interaction diagram of an example of a method of communication according to an embodiment of the present application.

[0060] FIG. 9 is a schematic flow interaction diagram of another method of communication according to an embodiment of the present application.

[0061] FIG. 10 is a flow interaction diagram of another example of a method of communication according to an embodiment of the present application.

[0062] FIGS. 11-15 are schematic block diagrams of communication apparatus according to embodiments of the present application. DETAILED DESCRIPTION

[0063] The technical solutions provided by the present application will be described below with reference to the accompanying drawings.

[0064] The embodiments of the present application can be applied to various communication systems, such as a wireless local area network (WLAN), a narrow band-internet of things (NB-IoT), a global system for mobile communications (GSM), an enhanced data rate for gsm evolution (EDGE), a wideband code division multiple access (WCDMA), a code division multiple access 2000 (CDMA2000), a time division-synchronization code division multiple access (TD-SCDMA), a long term evolution (LTE) system, a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) communication system, a satellite communication system, a 5th generation (5G) communication system, a 6th-generation (6G) communication system, or a new communication system to be developed in the future.

[0065] The terminal device involved in the embodiments of the present application can be a device with wireless transceiving function, and can specifically refer to a subscriber unit, a user equipment (UE), an access terminal, a cellular phone, a user station, a mobile station (MS), a customer-premises equipment (CPE), a remote station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent or a user apparatus. The terminal device can also be a satellite phone, a cellular phone, a smart phone, a wireless data card, a personal digital assistant (PDA) computer, a tablet computer, a wireless modulator demodulator (modem), a laptop computer, a machine type communication (MTC) device and a wireless terminal in self-driving, etc. The terminal device can also be a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a vehicle-mounted device, a wearable device, a computing device or other processing device connected to a wireless modem, a communication device carried on an airship, a drone, a robot, a smart point of sale (POS) machine, a terminal in device-to-device (D2D) communication, a terminal in vehicle to everything (V2X) communication, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home or a terminal device in future communication network, etc. The user equipment includes a vehicle user equipment.With the rise of the internet of things (IoT) technology, more and more devices that were previously not equipped with communication functions, such as but not limited to household appliances, vehicles, tool devices, service devices, and service facilities, start to obtain wireless communication functions by configuring wireless communication units, so as to access wireless communication networks and accept remote control. Such devices are equipped with wireless communication functions due to the configuration of wireless communication units, and thus also belong to the category of wireless communication devices. This application is not limited.

[0066] In the embodiments of the present application, the device for implementing the function of the terminal device can be a terminal device; or can be a device capable of supporting the terminal device to implement the function, such as a chip system. The device can be installed in the terminal device or used in matching with the terminal device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0067] The network device involved in the embodiments of the present application is a device in a wireless network, for example, a radio access network (RAN) node for accessing a terminal device to a wireless network. The network device can be a node in a radio access network, also can be referred to as a base station, and also can be referred to as a radio access network (RAN) node (or device). The network device can be a base transceiver station (BTS) in a GSM or CDMA network, a Node B (NB) in a WCDMA network, an evolved Node B (eNB or eNodeB) in an LTE network, or a next generation Node B (gNB) in a 5G network; the network device can be a base station in a future evolved public land mobile network (PLMN), or an access device in the 3rd generation partnership project (3GPP); the network device can also be a wireless controller in a cloud radio access network (CRAN) scenario.Optionally, the network device in the embodiments of the present application can include various forms of base stations, such as a relay station, an access point, a device implementing the function of a base station in a 5G or later evolved communication system, a mobile switching center, a home base station (home evolved NodeB or home Node B, HNB), a baseband unit (baseband unit, BBU), a device assuming the function of a base station in device-to-device (device to device, D2D), an access point (access point, AP) in a wireless fidelity (wireless fidelity, WIFI) system, a wireless relay node, a wireless backhaul node, a transmission point (transmission point, TP), or a transmission and reception point (transmission and reception point, TRP), and the like, a device assuming the function of a base station in vehicle-to-everything (vehicle-to-everything, V2X) and machine-to-machine (machine-to-machine, M2M) communication, and the like, and can also include a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU) in a cloud radio access network (cloud radio access network, C-RAN) system, a network device in a non-terrestrial network (non-terrestrial network, NTN) communication system, that is, can be deployed on a high-altitude platform or a satellite. It can also be a gNB or a transmission point in new radio (new radio, NR), one or a group (including multiple) of antenna panels of a base station in NR, or a network node constituting a gNB or a transmission point, or the network device can also be a vehicle-mounted device, a wearable device, and a network device in a 6G network, or a network device in a future evolved PLMN network, and the like, or a network device deployed on a satellite, and the embodiments of the present application are not limited thereto. In addition, according to the size of the service coverage area provided, the base station can be divided into a macro base station for providing a macro cell, a micro base station for providing a micro cell, and a femto base station for providing a femto cell. With the continuous evolution of wireless communication technology, future base stations can also use other names.

[0068] In the embodiments of the present application, the device for implementing the function of the network device can be a network device; or can be a device capable of supporting the network device to implement the function, such as a chip system. The device can be installed in the network device or used in combination with the network device.

[0069] The reflection device in the embodiments of the present application is used for reflecting signals transmitted by the network device or the terminal device.

[0070] FIG. 1 is a schematic diagram of a network architecture to which the embodiments of the present application are applicable. The network architecture includes a terminal device, a network device and a reflection device. The reflection device can be an active RIS, and the network device can be a base station. The terminal device is used for transmitting uplink signals to the network device or receiving downlink signals from the network device; the network device is used for receiving uplink signals from the terminal device or transmitting downlink signals to the terminal device; and the active RIS is used for reflecting signals transmitted by the network device or the terminal device, and can be a transmissive panel or a reflective panel. In a communication system, a module used for controlling the active RIS can be regarded as a mobile terminal (MT), and therefore, the reflection device can also be referred to as a network node, and the specific name is not limited in the embodiments of the present application.

[0071] The terminal device in the embodiments of the present application can refer to the terminal device itself, or a component (for example, a processor, a chip or a chip system) in the terminal device, or a logic module or software capable of realizing all or part of the terminal device functions. The network device in the embodiments of the present application can refer to the network device itself, or a component (for example, a processor, a chip or a chip system) in the network device, or a logic module or software capable of realizing all or part of the network device functions. FIG. 2 is a schematic diagram of an architecture of a chip system to which the embodiments of the present application are applicable. In the figure, A / D represents an analog-to-digital converter, and D / A represents a digital-to-analog converter. The chip system includes a baseband chip, a middle radio frequency chip, a radio frequency front end and an antenna. Table 1 shows the functions of different modules in the chip system.

[0072] Table 1

[0073] In order to facilitate the understanding of the embodiments of the present application, the concepts involved in the embodiments of the present application are first explained.

[0074] 1、port: antenna port is short for port. It can be understood as a transmitting antenna identified by a receiving end, or a transmitting antenna that can be distinguished in space, which can be a virtual antenna or a spatial resource. The receiving end can be a network device or a terminal device. Each virtual antenna or spatial resource can correspond to an antenna port, and each virtual antenna can be a weighted combination of multiple physical antennas. According to different signals carried, the antenna port can be divided into a reference signal port and a data port. The reference signal port can include but is not limited to a sounding reference signal (SRS) port, a demodulation reference signal (DMRS) port, a channel state information reference signal (CSI-RS) port, etc. For the DMRS port, each DMRS port corresponds to a spatial stream or a spatial layer, each DMRS port corresponds to a port index, each DMRS port corresponds to a DMRS sequence, and each DMRS port corresponds to one or more time-frequency resources. The corresponding DMRS sequence is mapped in the time-frequency resource unit contained in one or more time-frequency resources according to a rule; the DMRS sequence can also be referred to as a DMRS symbol sequence or a DMRS symbol vector; the time-frequency resource unit can be a frequency domain subcarrier, or an orthogonal frequency division multiplexing (OFDM) symbol, or a resource element (RE). For the SRS port, each SRS port corresponds to an antenna port; each SRS port corresponds to an SRS sequence, which is mapped in the corresponding time-frequency resource unit.

[0075] 2、quantization: in the field of digital signal processing, it refers to the process of approximating the continuous value (or a large number of possible discrete values) of a signal to a finite number (or fewer) of discrete values.

[0076] 3、uniform quantization: it refers to the quantization of values equally spaced in their value range. For example: the phase value is [0, 2p), and the implementation of 2-bit uniform quantization is to divide the value range [0, 2p) into 4 (corresponding to 2 bits) quantized values, with an interval of 2p / 4, and the quantized values are 0, 2p / 4, 4p / 4, and 6p / 4. The usual quantization method is to quantize the value to the nearest quantized value, such as p / 8, which is quantized to 0, and 3p / 8, which is quantized to 2p / 4.

[0077] In order to facilitate the understanding of the embodiments of the present application, the technical solutions related to the embodiments of the present application are briefly introduced as follows.

[0078] There are various distributed multiple-input multiple-output (MIMO) modes in the network to provide coverage compensation or enhance performance for a cell. In the embodiments of the present application, active distributed MIMO nodes are mainly considered, such as network-controlled repeaters (NCRs), active RISs, and the like.

[0079] I. Active RIS

[0080] FIG. 3 is a schematic diagram of the structure of an active RIS. The active RIS is an array surface composed of multiple weight-adjustable array elements and PAs respectively used for uplink and downlink reflection. In FIG. 3, a single-channel active RIS is taken as an example. The single channel can be understood as that there is only one PA in one direction from one surface of the RIS to another surface. The active RIS includes a surface A and a surface B. One surface of the active RIS is used for communication with a base station, and the other surface is used for communication with a terminal device. In addition, the active RIS is also equipped with a mobile terminal for receiving control signaling of the base station. The base station can adjust the weight of each array element by sending signaling to the active RIS, so as to reflect the received signal at the active RIS to the desired direction, thereby realizing functions such as channel enhancement and channel rank enhancement in a weak coverage area.

[0081] FIG. 4 is a schematic diagram of an application scenario of the active RIS in a live network. In FIG. 4, the LOS path of the base station to the terminal device is blocked by a building or the like. Without the active RIS, the signal transmitted by the base station can only reach the terminal device through the NLOS path, and the received signal at the terminal device is weak. After the active RIS is deployed, the base station can reasonably adjust the weight of the array element of the active RIS and the power of the PA, form a beam, and construct a relatively strong path on the base station-active RIS-terminal device path, thereby realizing coverage enhancement in a weak coverage area.

[0082] FIG. 5 is a schematic diagram of the working principle of the active RIS. A simplified communication module / mobile terminal is configured on the active RIS to receive control information of the base station. When the base station needs to perform uplink and downlink data transmission, the base station will first send the weight information of the array element of the active RIS and the PA power, and the validity time slot of the weight to the active RIS through control signaling, such as downlink control information (DCI). When the corresponding uplink and downlink data is transmitted, the active RIS will switch the corresponding weight according to the indication of the base station at the corresponding time slot, so as to reflect the received signal to the desired direction.

[0083] II. Calibration of uplink and downlink reciprocity

[0084] The uplink-downlink reciprocity calibration of the active RIS refers to calibrating the uplink channel and the downlink channel of the base station-active RIS-terminal device, so as to keep the uplink channel and the downlink channel of the base station-active RIS-terminal device consistent. There are mainly two reasons for the inconsistency between the uplink channel and the downlink channel of the base station-active RIS-terminal device: first, because the uplink PA and the downlink PA of the active RIS are different, it is difficult for the uplink PA and the downlink PA to keep the same power amplification factor and phase rotation coefficient during uplink and downlink channel transmission; second, the power of the signals received by the active RIS during uplink transmission and downlink transmission is different, causing the uplink PA and the downlink PA to work in different regions, even if the uplink PA and the downlink PA are the same PA under the same parameter setting, the amplification factor cannot be kept consistent. For example, during downlink transmission, the power of the signal received by the active RIS from the base station is usually large, at this time the PA usually works in the nonlinear region; while during uplink transmission, the power of the signal received by the active RIS from the terminal device is usually small, at this time the PA usually works in the linear region.

[0085] In a time division duplexing (TDD) system, the transmission weight of the base station is usually determined by the following steps: (1) the terminal device sends SRS; (2) the base station receives the SRS and estimates the uplink channel between the base station and the terminal device according to the received SRS, since the uplink channel and the downlink channel have reciprocity, the base station determines the transmission weight through the estimated uplink channel. However, when there is an active RIS (active distributed MIMO node) in the system, the uplink channel and the downlink channel do not have reciprocity, and the terminal device served by the active RIS needs to feed back the downlink channel to the base station through the precoding matrix indicator (PMI), which is determined by the terminal device through measuring the downlink CSI-RS. The measurement resource overhead of the scheme for obtaining the downlink channel through PMI feedback and the overhead of feeding back the PMI are large; in addition, since the PMI feedback needs to be quantized, the estimation accuracy of the downlink channel is not high.

[0086] Therefore, an embodiment of the present application provides a communication method, which can realize the consistency of the uplink channel and the downlink channel.

[0087] FIG. 6 is a schematic flow interaction diagram of a method 600 of communication provided by an embodiment of the present application. The network device in the present application can be a network device or a module (such as a circuit, a chip, a chip system or a processor) in the network device, and can also be a logic node, a logic module or software capable of realizing all or part of the functions of the network device. The terminal device in the present application can be a terminal device or a module (such as a circuit, a chip, a chip system or a processor) in the terminal device, and can also be a logic node, a logic module or software capable of realizing all or part of the functions of the terminal device. The reflecting device in the present application can be an active RIS.

[0088] S610, the network device transmits the first reference signal and the second reference signal respectively using the first precoding matrix, the weight value used by the elements of the reflecting device in the process of transmitting the first reference signal is the first weight value, the weight value used by the elements of the reflecting device in the process of transmitting the second reference signal is the second weight value, and the first weight value is the opposite of the second weight value. Correspondingly, the terminal device receives the first reference signal and the second reference signal transmitted by the network device using the first precoding matrix respectively using the second precoding matrix. Wherein, the reflecting device is further configured to transmit the first reference signal and the second reference signal.

[0089] S610, the network device transmits the first reference signal and the second reference signal respectively using the first precoding matrix, the weight value used by the elements of the reflecting device in the process of transmitting the first reference signal is the first weight value, the weight value used by the elements of the reflecting device in the process of transmitting the second reference signal is the second weight value, and the first weight value is the opposite of the second weight value. Correspondingly, the terminal device receives the first reference signal and the second reference signal transmitted by the network device using the first precoding matrix respectively using the second precoding matrix. Wherein, the reflecting device is further configured to transmit the first reference signal and the second reference signal.

[0090] Optionally, the first reference signal comprises a first CSI-RS, and the second reference signal comprises a second CSI-RS. Illustratively, the first reference signal is a first CSI-RS, and the second reference signal is a second CSI-RS.

[0091] S620, the terminal device transmits the third reference signal and the fourth reference signal respectively using the second precoding matrix, the weight value used by the elements of the reflecting device in the process of transmitting the third reference signal is the first weight value, and the weight value used by the elements of the reflecting device in the process of transmitting the fourth reference signal is the second weight value. Correspondingly, the network device receives the third reference signal and the fourth reference signal transmitted by the terminal device using the second precoding matrix respectively using the first precoding matrix. Wherein, the reflecting device is further configured to transmit the third reference signal and the fourth reference signal.

[0092] Exemplarily, the terminal device transmits the third reference signal using the second precoding matrix, and the reflecting device uses the first weight value in the process of transmitting the third reference signal; correspondingly, the network device receives the third reference signal transmitted by the terminal device using the second precoding matrix using the first precoding matrix. The terminal device transmits the fourth reference signal using the second precoding matrix, and the reflecting device uses the second weight value in the process of transmitting the fourth reference signal; correspondingly, the network device receives the fourth reference signal transmitted by the terminal device using the second precoding matrix using the first precoding matrix.

[0093] Optionally, the third reference signal includes a first SRS, and the fourth reference signal includes a second SRS. Exemplarily, the third reference signal is the first SRS, and the fourth reference signal is the second SRS.

[0094] S630, the terminal device transmits first information to the network device, the first information including the first reference signal and the second reference signal received by the terminal device using the second precoding matrix respectively, for the network device to determine the ratio of the first power amplification factor of the reflecting device in the uplink transmission process to the second power amplification factor of the reflecting device in the downlink transmission process. Correspondingly, the network device receives the first information from the terminal device. In the present application, the power amplification factor is determined by the power amplification multiple and the phase rotation coefficient.

[0095] Optionally, the first information transmitted by the terminal device to the network device includes a floating point number. Alternatively, the first information transmitted by the terminal device to the network device includes a floating point number and information after uniform quantization processing. It should be noted that the first reference signal / second reference signal received by the terminal device is a matrix composed of one or more elements, each element is a complex number, each element has a corresponding real part and imaginary part, or each element has a corresponding amplitude and phase.

[0096] Exemplarily, the real part and the imaginary part of each element of the first reference signal and the second reference signal received by the terminal device included in the first information are floating point numbers. Exemplarily, the amplitude of each element of the first reference signal and the second reference signal received by the terminal device included in the first information is a floating point number, and the phase of each element is after uniform quantization processing. Exemplarily, the amplitude of the largest element of the first reference signal and the second reference signal received by the terminal device included in the first information is a floating point number, and the amplitudes of the remaining elements are normalized to the largest element and after uniform quantization processing, and the phase of each element is after uniform quantization processing.

[0097] Wherein, step S630 can be executed after step S620, or step S630 can be executed before step S620, which is not limited in the present application.

[0098] Exemplarily, taking the first reference signal as the first CSI-RS and the second reference signal as the second CSI-RS as an example, the first information further includes CSI-RS resource indexes and SRS resource indexes corresponding to the first CSI-RS received by the terminal device, and CSI-RS resource indexes and SRS resource indexes corresponding to the second CSI-RS received by the terminal device. Specifically, the first information further includes CSI-RS resource indexes and SRS resource indexes corresponding to different elements in the first CSI-RS received by the terminal device, and CSI-RS resource indexes and SRS resource indexes corresponding to different elements in the second CSI-RS received by the terminal device. For example, the network device includes 3 CSI-RS ports, and the terminal device includes 2 SRS ports, then the first CSI-RS received by the terminal device includes 3*2=6 elements, each element corresponds to a CSI-RS port and an SRS port. It should be noted that the CSI-RS port index can be determined according to the CSI-RS resource index and the configuration information of the CSI-RS; and the SRS port index can be determined according to the SRS resource index and the configuration information of the SRS.

[0099] Optionally, before the network device sends the first reference signal and the second reference signal, the network device sends configuration information to the terminal device, the configuration information indicating resources for sending the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and resource indexes of the resources. Exemplarily, the configuration information indicates resources for sending the first CSI-RS, the second CSI-RS, the first SRS, and the second SRS, and resource indexes of the resources. Correspondingly, the terminal device receives the configuration information from the network device. In this application, the resources for sending the XX signal include time, frequency, and code domain resources for sending the XX signal.

[0100] Optionally, S631, the network device determines, according to the first information, the received third reference signal, and the fourth reference signal, a ratio of a first power amplification factor of a power amplifier used by the reflecting device in the uplink transmission process to a second power amplification factor of a power amplifier used by the reflecting device in the downlink transmission process.

[0101] S640, the network device sends second information to the reflecting device, the second information indicating a ratio of a first power amplification factor of the reflecting device in the uplink transmission process to a second power amplification factor of the reflecting device in the downlink transmission process, for the reflecting device to adjust the first power amplification factor and / or the second power amplification factor, the ratio of the first power amplification factor to the second power amplification factor being determined according to the first information, the received third reference signal, and the fourth reference signal. Optionally, the second information is information after uniform quantization processing.

[0102] Correspondingly, the reflecting device receives the second information from the network device, and adjusts the first power amplification factor and / or the second power amplification factor according to the second information, so that the first power amplification factor is the same as the second power amplification factor, thereby realizing the consistency of the uplink channel and the downlink channel. For example, the reflecting device receives the second information from the network device, and adjusts the first power amplification factor according to the second information, and the adjusted first power amplification factor is the same as the second power amplification factor. For example, the reflecting device receives the second information from the network device, and adjusts the second power amplification factor according to the second information, and the adjusted second power amplification factor is the same as the first power amplification factor. For example, the reflecting device receives the second information from the network device, and adjusts the first power amplification factor and the second power amplification factor according to the second information, and the adjusted first power amplification factor is the same as the adjusted second power amplification factor.

[0103] Optionally, the second information indicates the first power amplification factor / second power amplification factor; or the second information indicates the second power amplification factor / first power amplification factor; or the second information indicates the minimum value of the first power amplification factor / second power amplification factor and the second power amplification factor / first power amplification factor, and the numerical range of the minimum value is 0-1.

[0104] In the technical scheme provided in the embodiments of the present application, the network device uses a first precoding matrix to respectively transmit a first reference signal and a second reference signal, the terminal device uses a second precoding matrix to respectively receive the first reference signal and the second reference signal, the weight used by the elements of the reflecting device in the process of transmitting the first reference signal is a first weight, the weight used by the elements of the reflecting device in the process of transmitting the second reference signal is a second weight, the first weight is the opposite of the second weight; the terminal device uses the second precoding matrix to respectively transmit a third reference signal and a fourth reference signal, the network device uses the first precoding matrix to respectively receive the third reference signal and the fourth reference signal, the weight used by the elements of the reflecting device in the process of transmitting the third reference signal is the first weight, and the weight used by the elements of the reflecting device in the process of transmitting the fourth reference signal is the second weight; the terminal device transmits first information to the network device, the first information comprising the first reference signal and the second reference signal received by the terminal device using the second precoding matrix; the network device determines the ratio of a first power amplification factor of the reflecting device in the uplink transmission process to a second power amplification factor of the reflecting device in the downlink transmission process according to the first information and the third reference signal and the fourth reference signal received by the network device, and transmits second information used for indicating the ratio of the first power amplification factor to the second power amplification factor to the reflecting device; the reflecting device can adjust the first power amplification factor and / or the second power amplification factor according to the second information, so that the adjusted first power amplification factor is the same as the second power amplification factor, thereby realizing the consistency of the uplink channel and the downlink channel of the network device-reflecting device-terminal device, and the network device no longer needs to obtain the downlink channel through PMI feedback.

[0105] The method of communication provided in FIG. 6 is described below in combination with a specific example. In this example, the network device is a base station, and the reflecting device is an active RIS. FIG. 7 is a schematic diagram of the uplink channel and the downlink channel of the base station-active RIS-terminal device.

[0106] Let the downlink channel from the base station to the terminal device be H d , then the uplink channel from the terminal device to the base station is Let the downlink channel from the base station to the active RIS be H BR , then the uplink channel from the active RIS to the base station is Let the downlink channel from the active RIS to the terminal device be H RU , then the uplink channel from the terminal device to the active RIS is Let the first precoding matrix of the base station be W B , the transmission non-ideal factor on the digital transmission port of the base station be T B , and the reception non-ideal factor on the digital reception port of the base station be R B , wherein the first precoding matrix WB Each column in T represents a weight. B and R B Let W be a diagonal matrix. Let W be the second precoding matrix of the terminal device. U The transmission non-ideal factor on the digital transmission port of the terminal device is T. U The reception non-ideal factor on the digital receiving port of the terminal device is R. U The second precoding matrix W U Each column in the table represents a weight. Let α be the power amplification factor of the downlink PA of the active RIS, and β be the power amplification factor of the uplink PA.

[0107] Figure 8 is a flowchart illustrating an example of a communication method provided in an embodiment of this application.

[0108] S810, the base station uses the first precoding matrix W B The first CSI-RS is transmitted, and one CSI-RS port uses the first precoding matrix W. B One of the weights; correspondingly, the terminal device uses the second precoding matrix W. U The first CSI-RS is received; during the transmission of the first CSI-RS, the weights of the array elements of the active RIS are set to Φ. Here, the first CSI-RS can be understood as the aforementioned first reference signal, and Φ can be understood as the aforementioned first weight. The terminal device uses the second precoding matrix W. U The first received CSI-RS can be represented by the following formula (1):

[0109] in, This indicates that the terminal device uses the second precoding matrix W. U The first CSI-RS received, This indicates the noise signal received by the terminal device.

[0110] S820, the base station uses the first precoding matrix W B The second CSI-RS is transmitted; correspondingly, the terminal device uses the second precoding matrix W. U The second CSI-RS is received; during the transmission of the second CSI-RS, the weights of the active RIS array elements are set to -Φ. Here, the second CSI-RS can be understood as the aforementioned second reference signal, and -Φ can be understood as the aforementioned second weight. The terminal device uses the second precoding matrix W. U The received second CSI-RS can be represented by the following formula (2):

[0111] in, This indicates that the terminal device uses the second precoding matrix W. UThe received second CSI-RS, denotes the noise signal received by the terminal device.

[0112] S830, the terminal device uses the second precoding matrix W U transmits the first SRS, one SRS port uses the second precoding matrix W U correspondingly, the base station uses the first precoding matrix W B receives the first SRS, the weights of the elements of the active RIS in the process of transmitting the first SRS are set to Φ. Wherein, the first SRS can be understood as the third reference signal described above. The base station uses the weight matrix W B The received first SRS can be represented by the following formula (3):

[0113] wherein, denotes that the base station uses the first precoding matrix W B The received first SRS, denotes the noise signal received by the base station.

[0114] S840, the terminal device uses the second precoding matrix W U transmits the second SRS; correspondingly, the base station uses the first precoding matrix W B receives the second SRS, the weights of the elements of the active RIS in the process of transmitting the second SRS are set to-Φ. Wherein, the second SRS can be understood as the fourth reference signal described above. The base station uses the first precoding matrix W B The received second SRS can be represented by the following formula (4):

[0115] wherein, denotes that the base station uses the first precoding matrix W B The received second SRS, denotes the noise signal received by the base station.

[0116] S850, the terminal device sends first information to the base station, the first information includes and Optionally, the first information includes Or, the first information includes The present application does not limit this; wherein, denotes element by element, for example, matrix A and matrix B are both 3 rows and 3 columns of matrix, denotes the element of the Nth row and the Nth column of matrix A divided by the element of the Nth row and the Nth column of matrix B, N is a positive integer less than or equal to 3. Correspondingly, the base station receives the first information from the terminal device.

[0117] It should be noted that step S850 can be executed after step S840, or after step S820 and before step S830. Steps S830 and S840 can be executed after steps S810 and S820, or before steps S810 and S820. This application does not impose any limitations on this.

[0118] S860, the base station uses the first precoding matrix W based on the first information. B The first SRS received and the first precoding matrix W B The received second SRS determines α / β.

[0119] For example, the first information includes and Base station according to and Determine α / β. Specifically, the base station calculates... and And calculate It should be noted that,

[0120] For example, the first information includes Base station calculation And calculate

[0121] S870, the base station sends second information to the active RIS, which indicates α / β. Correspondingly, the active RIS receives α / β from the base station and adjusts α according to α / β so that the adjusted α is the same as β; or, the active RIS adjusts β according to α / β so that the adjusted β is the same as α; or, the active RIS adjusts α and β according to α / β so that the adjusted α is the same as the adjusted β. This embodiment of the application does not limit this. Optionally, the second information indicates β / α, or the second information indicates the minimum value between α / β and β / α.

[0122] Figure 9 is a schematic flowchart illustrating a communication method 900 provided in an embodiment of this application. The network device in this application can be a network device or a module within a network device (e.g., a circuit, chip, chip system, or processor), or it can be a logical node, logical module, or software capable of implementing all or part of the functions of a network device. The terminal device in this application can be a terminal device or a module within a terminal device (e.g., a circuit, chip, chip system, or processor), or it can be a logical node, logical module, or software capable of implementing all or part of the functions of a terminal device. The reflection device in this application can be an active RIS.

[0123] S910, the network device uses a first precoding matrix to transmit a first reference signal and a second reference signal, respectively. During the transmission of the first reference signal, the array elements of the reflecting device use a first weight, and during the transmission of the second reference signal, the array elements of the reflecting device use a second weight. The first weight is the inverse of the second weight. Correspondingly, the terminal device uses a second precoding matrix to receive the first reference signal and the second reference signal transmitted by the network device using the first precoding matrix, respectively. The reflecting device is used to transmit the first reference signal and the second reference signal.

[0124] For example, a network device transmits a first reference signal using a first precoding matrix, and the array elements of the reflecting device use a first weight value during the transmission of the first reference signal; correspondingly, a terminal device receives the first reference signal transmitted by the network device using a second precoding matrix. The network device also transmits a second reference signal using the first precoding matrix, and the array elements of the reflecting device use a second weight value during the transmission of the second reference signal; correspondingly, a terminal device receives the second reference signal transmitted by the network device using the first precoding matrix using a second precoding matrix.

[0125] Optionally, the first reference signal includes a first CSI-RS, and the second reference signal includes a second CSI-RS. For example, the first reference signal is the first CSI-RS, and the second reference signal is the second CSI-RS.

[0126] In step S920, the terminal device uses a second precoding matrix to transmit a third reference signal and a fourth reference signal, respectively. During the transmission of the third reference signal, the array elements of the reflecting device use a first weight, and during the transmission of the fourth reference signal, the array elements of the reflecting device use a second weight. Correspondingly, the network device uses a first precoding matrix to receive the third and fourth reference signals transmitted by the terminal device using the second precoding matrix, respectively. The reflecting device is also used to transmit the third and fourth reference signals.

[0127] For example, the terminal device transmits a third reference signal using a second precoding matrix, and the reflection device uses a first weight during the transmission of the third reference signal; correspondingly, the network device uses a first precoding matrix to receive the third reference signal transmitted by the terminal device using the second precoding matrix. The terminal device transmits a fourth reference signal using the second precoding matrix, and the reflection device uses a second weight during the transmission of the fourth reference signal; correspondingly, the network device uses a first precoding matrix to receive the fourth reference signal transmitted by the terminal device using the second precoding matrix.

[0128] Optionally, the third reference signal includes the first SRS, and the fourth reference signal includes the second SRS. For example, the third reference signal is the first SRS, and the fourth reference signal is the second SRS.

[0129] S930, the network device sends third information to the terminal device. This third information includes a third reference signal and a fourth reference signal received by the network device using the first precoding matrix, respectively. These signals are used by the terminal device to determine the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission. Correspondingly, the terminal device receives the third information from the network device.

[0130] Optionally, the third information sent by the network device to the terminal device includes floating-point numbers. Alternatively, the third information sent by the network device to the terminal device includes floating-point numbers and information processed by uniform quantization. It should be noted that the third reference signal / fourth reference signal received by the network device is a matrix composed of one or more elements, each element being a complex number, each element having a corresponding real part and an imaginary part, or each element having a corresponding amplitude and phase.

[0131] For example, in the third information, the real and imaginary parts of each element in the third and fourth reference signals received by the network device are floating-point numbers. For example, the amplitude of each element in the third and fourth reference signals received by the network device is a floating-point number, and the phase of each element is uniformly quantized. For example, the amplitude of the largest element in the third and fourth reference signals received by the network device is a floating-point number, the amplitudes of the remaining elements are normalized and uniformly quantized based on the largest element, and the phase of each element is uniformly quantized.

[0132] Step S930 can be executed after step S920 or before step S920; this application does not limit this.

[0133] Optionally, taking the third reference signal as the first SRS and the fourth reference signal as the second SRS as an example, the third information also includes the CSI-RS resource index and SRS resource index corresponding to the first SRS received by the network device, and the CSI-RS resource index and SRS resource index corresponding to the second SRS received by the network device. Specifically, the third information also includes the CSI-RS resource index and SRS resource index corresponding to different elements in the first SRS received by the network device, and the CSI-RS resource index and SRS resource index corresponding to different elements in the second SRS received by the network device.

[0134] Optionally, before transmitting the first reference signal and the second reference signal, the network device sends configuration information to the terminal device. This configuration information indicates the resources used to transmit the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, as well as the resource indexes of those resources. For example, the configuration information indicates the resources used to transmit the first CSI-RS, the second CSI-RS, the first SRS, and the second SRS, and the resource indexes of those resources. Correspondingly, the terminal device receives the configuration information from the network device.

[0135] Optionally, in S931, the terminal device determines the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission based on the third information, the first reference signal and the second reference signal received using the second precoding matrix, respectively.

[0136] S940, the terminal device sends fourth information to the network device, the fourth information indicating the ratio of the first power amplification factor to the second power amplification factor. Correspondingly, the network device receives the fourth information from the terminal device.

[0137] S950, the network device sends second information to the reflecting device, the second information indicating the ratio of the first power amplification factor to the second power amplification factor, for the reflecting device to adjust the first power amplification factor and / or the second power amplification factor.

[0138] Correspondingly, the reflection device receives second information from the network device and adjusts the first power amplification factor and / or the second power amplification factor according to the second information, making the first power amplification factor and the second power amplification factor the same, thereby achieving consistency between the uplink channel and the downlink channel. For example, the reflection device receives second information from the network device and adjusts the first power amplification factor according to the second information, making the adjusted first power amplification factor the same as the second power amplification factor. For example, the reflection device receives second information from the network device and adjusts the second power amplification factor according to the second information, making the adjusted second power amplification factor the same as the first power amplification factor. For example, the reflection device receives second information from the network device and adjusts the first power amplification factor and the second power amplification factor according to the second information, making the adjusted first power amplification factor the same as the adjusted second power amplification factor.

[0139] Optionally, the second information indicates the first power amplification factor / second power amplification factor; or, the second information indicates the second power amplification factor / first power amplification factor; or, the second information indicates the minimum value among the first power amplification factor / second power amplification factor and the second power amplification factor / first power amplification factor, wherein the minimum value ranges from 0 to 1.

[0140] In the technical solution provided in this application embodiment, the network device uses a first precoding matrix to transmit a first reference signal and a second reference signal respectively, and the terminal device uses a second precoding matrix to receive the first reference signal and the second reference signal respectively. During the transmission of the first reference signal, the array elements of the reflecting device use a first weight value, and during the transmission of the second reference signal, the array elements of the reflecting device use a second weight value. The first weight value is the inverse of the second weight value. The terminal device uses the second precoding matrix to transmit a third reference signal and a fourth reference signal respectively, and the network device uses the first precoding matrix to receive the third reference signal and the fourth reference signal respectively. During the transmission of the third reference signal, the array elements of the reflecting device use a first weight value, and during the transmission of the fourth reference signal, the array elements of the reflecting device use a second weight value. The network device sends third information to the terminal device, the third information including the network device's... The first precoding matrix receives the third reference signal and the fourth reference signal respectively; the terminal device determines the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission based on the third information and the first and second reference signals received by the terminal device, and sends fourth information indicating the ratio of the first power amplification factor to the second power amplification factor to the network device; the network device sends second information to the reflecting device to indicate the ratio of the first power amplification factor to the second power amplification factor; the reflecting device can adjust the first power amplification factor and / or the second power amplification factor according to the second information, so that the adjusted first power amplification factor is the same as the second power amplification factor, thereby achieving the consistency of the uplink and downlink channels of the network device, the reflecting device, and the terminal device, and the network device no longer needs to obtain the downlink channel through PMI feedback.

[0141] The communication method provided in Figure 9 will be described below with reference to a specific example. In this example, a network device is used as the base station, and an active RIS is used as the reflection device. Figure 10 is a flowchart illustrating another example of the communication method provided in the embodiments of this application.

[0142] S1010, the base station uses the first precoding matrix W B The first CSI-RS is transmitted, and one CSI-RS port uses the first precoding matrix W. B One of the weights; correspondingly, the terminal device uses the second precoding matrix W. U The first CSI-RS is received; during the transmission of the first CSI-RS, the weights of the array elements of the active RIS are set to Φ. Here, the first CSI-RS can be understood as the aforementioned first reference signal, and Φ can be understood as the aforementioned first weight. The terminal device uses the second precoding matrix W. U The first CSI-RS received can be represented by the above formula (1).

[0143] S1020, the base station uses the first precoding matrix W B The second CSI-RS is transmitted; correspondingly, the terminal device uses the second precoding matrix W. U The second CSI-RS is received; during the transmission of the second CSI-RS, the weights of the active RIS array elements are set to -Φ. Here, the second CSI-RS can be understood as the aforementioned second reference signal, and -Φ can be understood as the aforementioned second weight. The terminal device uses the second precoding matrix W. U The received second CSI-RS can be represented by the above formula (2).

[0144] S1030, the terminal device uses the second precoding matrix W U Send the first SRS, one SRS port uses the second precoding matrix W U One of the weights; correspondingly, the base station uses the first precoding matrix W. B The first SRS is received, and the weights of the active RIS array elements are set to Φ during the transmission of the first SRS. The first SRS can be understood as the aforementioned third reference signal. The base station uses the first precoding matrix W. B The first SRS received can be represented by the above formula (3).

[0145] S1040, the terminal device uses the second precoding matrix W U The second SRS is transmitted; correspondingly, the base station uses the first precoding matrix W. B The second SRS is received, and the weights of the active RIS array elements are set to -Φ during the transmission of the second SRS. The second SRS can be understood as the aforementioned fourth reference signal. The base station uses the first precoding matrix W. B The received second SRS can be represented by the above formula (4).

[0146] S1050, the base station sends third information to the terminal device, the third information including and Optionally, the third information includes Alternatively, the third information includes This application does not impose any limitations on this. Correspondingly, the terminal device receives third information from the base station.

[0147] It should be noted that step S1050 can be executed after step S1040, or after step S1020 and before step S1030. Steps S1030 and S1040 can be executed after steps S1010 and S1020, or before steps S1010 and S1020. This application does not impose any limitations on this.

[0148] S1060, the terminal device uses the second precoding matrix W based on the third information. U The first CSI-RS received and the second precoding matrix W U The received second CSI-RS determines α / β.

[0149] For example, the third information includes and Terminal equipment according to and Determine α / β. Specifically, the terminal device calculates... and And calculate It should be noted that,

[0150] For example, the third information includes Terminal device computing And calculate

[0151] S1070, the terminal device sends fourth information to the base station, which indicates α / β. Correspondingly, the base station receives the fourth information from the terminal device.

[0152] S1080, the base station sends second information to the active RIS, which indicates α / β. Correspondingly, the active RIS receives α / β from the base station and adjusts α according to α / β so that the adjusted α is the same as β; or, the active RIS adjusts β according to α / β so that the adjusted β is the same as α; or, the active RIS adjusts α and β according to α / β so that the adjusted α is the same as the adjusted β. This embodiment of the application does not limit this. Optionally, the fourth information and the second information indicate β / α, or the fourth information and the second information indicate the minimum value between α / β and β / α.

[0153] The communication method provided in the embodiments of this application has been described above. The execution subject for performing the above communication method will be described below.

[0154] Figure 11 is a schematic block diagram of a communication device 1100 provided in an embodiment of this application. The communication device 1100 can be applied to / deployed in the network device of the method embodiment of Figure 6 or in the base station of the method embodiment of Figure 8. The communication device 1100 includes:

[0155] Transceiver module 1110 is used to transmit a first reference signal and a second reference signal using a first precoding matrix. During the transmission of the first reference signal, the array element of the reflector uses a first weight value, and during the transmission of the second reference signal, the array element of the reflector uses a second weight value. The first weight value is the opposite of the second weight value.

[0156] The transceiver module 1110 is further configured to receive, using the first precoding matrix, a third reference signal and a fourth reference signal sent by the terminal device using a second precoding matrix, respectively, wherein the array element of the reflecting device uses the first weight value during the transmission of the third reference signal, and the array element of the reflecting device uses the second weight value during the transmission of the fourth reference signal.

[0157] The transceiver module 1110 is further configured to receive first information from the terminal device, the first information including the first reference signal and the second reference signal respectively received by the terminal device using the second precoding matrix;

[0158] The transceiver module 1110 is further configured to send second information to the reflecting device, the second information indicating the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission, for the reflecting device to adjust the first power amplification factor and / or the second power amplification factor, the ratio of the first power amplification factor to the second power amplification factor being determined based on the first information, the received third reference signal, and the fourth reference signal.

[0159] Optionally, the communication device 1100 further includes a processing module 1120, configured to determine the ratio of the first power amplification factor to the second power amplification factor based on the first information, the received third reference signal, and the fourth reference signal.

[0160] Optionally, the first reference signal includes a first channel state information reference signal (CSI-RS), the second reference signal includes a second CSI-RS, the third reference signal includes a first detection reference signal (SRS), and the fourth reference signal includes a second SRS.

[0161] Optionally, the first information may further include the CSI-RS resource index and SRS resource index corresponding to the first CSI-RS received by the terminal device, and the CSI-RS resource index and SRS resource index corresponding to the second CSI-RS received by the terminal device.

[0162] Optionally, the transceiver module 1110 is further configured to send configuration information to the terminal device, the configuration information indicating resources for sending the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, as well as resource indexes of the resources.

[0163] Figure 12 is a schematic block diagram of another communication device 1200 provided in an embodiment of this application. This communication device 1200 can be applied to / deployed in the terminal device of the method embodiment of Figure 6 or the terminal device of the method embodiment of Figure 8. The communication device 1200 includes:

[0164] The transceiver module 1210 is used to receive a first reference signal and a second reference signal sent by a network device using a first precoding matrix, respectively, using a second precoding matrix. During the transmission of the first reference signal, the array element of the reflecting device uses a first weight value, and during the transmission of the second reference signal, the array element of the reflecting device uses a second weight value. The first weight value is the opposite of the second weight value.

[0165] The transceiver module 1210 is further configured to transmit a third reference signal and a fourth reference signal using the second precoding matrix, wherein the array element of the reflecting device uses the first weight value during the transmission of the third reference signal, and the array element of the reflecting device uses the second weight value during the transmission of the fourth reference signal.

[0166] The transceiver module 1210 is further configured to send first information to the network device, the first information including the first reference signal and the second reference signal received using the second precoding matrix, respectively, for the network device to determine the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission.

[0167] Optionally, the first reference signal includes a first CSI-RS, the second reference signal includes a second CSI-RS; the third reference signal includes a first detection reference signal SRS, and the fourth reference signal includes a second SRS.

[0168] Optionally, the first information may further include the CSI-RS resource index and SRS resource index corresponding to the first CSI-RS received, and the CSI-RS resource index and SRS resource index corresponding to the second CSI-RS received.

[0169] Optionally, the transceiver module 1210 is further configured to receive configuration information from the network device, the configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and a resource index of the resources.

[0170] Figure 13 is a schematic block diagram of another communication device 1300 provided in an embodiment of this application. This communication device 1300 can be applied to / deployed in the network device of the method embodiment of Figure 9 or in the base station of the method embodiment of Figure 10. The communication device 1300 includes:

[0171] The transceiver module 1310 is used to transmit a first reference signal and a second reference signal using a first precoding matrix. During the transmission of the first reference signal, the array element of the reflector device uses a first weight value, and during the transmission of the second reference signal, the array element of the reflector device uses a second weight value. The first weight value is the opposite of the second weight value.

[0172] The transceiver module 1310 is further configured to receive, using the first precoding matrix, a third reference signal and a fourth reference signal sent by the terminal device using a second precoding matrix, respectively, wherein the array element of the reflecting device uses the first weight value during the transmission of the third reference signal, and the array element of the reflecting device uses the second weight value during the transmission of the fourth reference signal.

[0173] The transceiver module 1310 is further configured to send third information to the terminal device, the third information including the third reference signal and the fourth reference signal received using the first precoding matrix respectively;

[0174] The transceiver module 1310 is further configured to receive fourth information from the terminal device, the fourth information indicating the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission, the ratio of the first power amplification factor to the second power amplification factor being determined by the terminal device based on the third information and the first reference signal and the second reference signal received by the terminal device using the second precoding matrix respectively;

[0175] The transceiver module 1310 is further configured to send second information to the reflecting device, the second information indicating the ratio of the first power amplification factor to the second power amplification factor, for the reflecting device to adjust the first power amplification factor and / or the second power amplification factor.

[0176] Optionally, the first reference signal includes a first CSI-RS, the second reference signal includes a second CSI-RS; the third reference signal includes a first SRS, and the fourth reference signal includes a second SRS.

[0177] Optionally, the third information may further include the CSI-RS resource index and SRS resource index corresponding to the first SRS received, and the CSI-RS resource index and SRS resource index corresponding to the second SRS received.

[0178] Optionally, the transceiver module 1310 is further configured to send configuration information to the terminal device, the configuration information indicating resources for sending the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, as well as resource indexes of the resources.

[0179] Figure 14 is a schematic block diagram of another communication device 1400 provided in an embodiment of this application. This communication device 1400 can be applied to / deployed in the terminal device of the method embodiment of Figure 9 or the terminal device of the method embodiment of Figure 10. The communication device 1400 includes:

[0180] The transceiver module 1410 is used to receive a first reference signal and a second reference signal sent by a network device using a first precoding matrix using a second precoding matrix. During the transmission of the first reference signal, the array element of the reflecting device uses a first weight value, and during the transmission of the second reference signal, the array element of the reflecting device uses a second weight value. The first weight value is the opposite of the second weight value.

[0181] The transceiver module 1410 is further configured to transmit a third reference signal and a fourth reference signal using the second precoding matrix, wherein the array element of the reflecting device uses the first weight value during the transmission of the third reference signal, and the array element of the reflecting device uses the second weight value during the transmission of the fourth reference signal.

[0182] The transceiver module 1410 is further configured to receive third information from the network device, the third information including the third reference signal and the fourth reference signal respectively received by the network device using the first precoding matrix;

[0183] The transceiver module 1410 is further configured to send fourth information to the network device, the fourth information indicating the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission, the ratio of the first power amplification factor to the second power amplification factor being determined based on the third information and the first reference signal and the second reference signal received using the second precoding matrix, respectively.

[0184] Optionally, the communication device 1400 further includes a processing module 1420, configured to determine the ratio of the first power amplification factor to the second power amplification factor based on the third information, the received first reference signal, and the second reference signal.

[0185] Optionally, the first reference signal includes a first CSI-RS, the second reference signal includes a second CSI-RS; the third reference signal includes a first SRS, and the fourth reference signal includes a second SRS.

[0186] Optionally, the third information may further include the CSI-RS resource index and SRS resource index corresponding to the first SRS received by the network device, and the CSI-RS resource index and SRS resource index corresponding to the second SRS received by the network device.

[0187] Optionally, the transceiver module 1410 is further configured to receive configuration information from the network device, the configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, and a resource index of the resources.

[0188] Figure 15 is a schematic block diagram of another communication device 1500 provided in an embodiment of this application. The communication device 1500 can be the aforementioned network device or terminal device, or it can be applied to the aforementioned network device or terminal device. The communication device 1500 includes a processor 1510, which implements the communication method provided in the embodiment of this application through logic circuits or executing code instructions.

[0189] Optionally, the communication device 1500 may also include interface circuitry 1520. Processor 1510 and interface circuitry 1520 are coupled to each other. It is understood that interface circuitry 1520 may be a transceiver or an input / output interface.

[0190] Optionally, the communication device 1500 may also include a memory 1530 for storing instructions executed by the processor 1510, or storing input data required by the processor 1510 to execute instructions, or storing data generated after the processor 1510 executes instructions.

[0191] The aforementioned processor 1510 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by software instructions. The aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0192] This application also provides a communication system, including a network device, a terminal device, and a reflection device in the communication method provided in this application.

[0193] This application also provides a computer-readable storage medium storing a computer program for implementing the methods in the above-described method embodiments. When the computer program is run on a computer, the computer can implement the methods in the above-described method embodiments.

[0194] This application also provides a computer program product, which includes a computer program that, when run on a computer, causes the methods in the above method embodiments to be executed.

[0195] This application also provides a chip, including a processor connected to a memory for storing computer programs, and the processor for executing the computer programs stored in the memory, so that the chip performs the methods described in the above method embodiments.

[0196] It should be understood that, in the embodiments of this application, for a technical feature, the technical features in that technical feature are distinguished by "first", "second" and "third", and there is no order of precedence or size among the technical features described by "first", "second" and "third".

[0197] Furthermore, the term "and / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. The term "at least one" in this application can represent "one" and "two or more." For example, A, B, and C can represent: A existing alone, B existing alone, C existing alone, A and B existing simultaneously, A and C existing simultaneously, C and B existing simultaneously, and A, B, and C existing simultaneously.

[0198] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0199] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0200] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0201] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0202] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0203] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0204] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, Applied to network devices, the method includes: A first reference signal and a second reference signal are transmitted using a first precoding matrix. During the transmission of the first reference signal, the array elements of the reflective device use a first weight value, and during the transmission of the second reference signal, the array elements of the reflective device use a second weight value. The first weight value is the opposite of the second weight value. The first precoding matrix is ​​used to receive the third reference signal and the fourth reference signal sent by the terminal device using the second precoding matrix, respectively. During the transmission of the third reference signal, the array element of the reflective device uses the first weight value, and during the transmission of the fourth reference signal, the array element of the reflective device uses the second weight value. Receive first information from the terminal device, the first information including the first reference signal and the second reference signal respectively received by the terminal device using the second precoding matrix; A second message is sent to the reflecting device, the second message indicating the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission, for the reflecting device to adjust the first power amplification factor and / or the second power amplification factor, the ratio of the first power amplification factor to the second power amplification factor being determined based on the first message, the received third reference signal, and the fourth reference signal.

2. The method according to claim 1, characterized in that, The method further includes: Based on the first information, the received third reference signal, and the fourth reference signal, the ratio of the first power amplification factor to the second power amplification factor is determined.

3. The method according to claim 1 or 2, characterized in that, The first reference signal includes a first channel state information reference signal (CSI-RS), and the second reference signal includes a second CSI-RS. The third reference signal includes a first detection reference signal (SRS), and the fourth reference signal includes a second SRS.

4. The method according to claim 3, characterized in that, The first information also includes the CSI-RS resource index and SRS resource index corresponding to the first CSI-RS received by the terminal device, and the CSI-RS resource index and SRS resource index corresponding to the second CSI-RS received by the terminal device.

5. The method according to any one of claims 1 to 4, characterized in that, The method further includes: The terminal device is sent configuration information, which indicates the resources used to send the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, as well as the resource index of the resources.

6. A communication method, characterized in that, Applied to a terminal device, the method includes: The first reference signal and the second reference signal sent by the network device using the first precoding matrix are received using the second precoding matrix. During the transmission of the first reference signal, the array element of the reflection device uses the first weight value, and during the transmission of the second reference signal, the array element of the reflection device uses the second weight value. The first weight value is the opposite of the second weight value. The second precoding matrix is ​​used to transmit the third reference signal and the fourth reference signal respectively. During the transmission of the third reference signal, the array elements of the reflective device use the first weight value, and during the transmission of the fourth reference signal, the array elements of the reflective device use the second weight value. The network device sends first information, which includes the first reference signal and the second reference signal received using the second precoding matrix, respectively, for the network device to determine the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission.

7. The method according to claim 6, characterized in that, The first reference signal includes a first CSI-RS, and the second reference signal includes a second CSI-RS; The third reference signal includes the first SRS, and the fourth reference signal includes the second SRS.

8. The method according to claim 7, characterized in that, The first information also includes the CSI-RS resource index and SRS resource index corresponding to the first CSI-RS received, and the CSI-RS resource index and SRS resource index corresponding to the second CSI-RS received.

9. The method according to any one of claims 6 to 8, characterized in that, The method further includes: The system receives configuration information from the network device, the configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, as well as resource indexes of the resources.

10. A method of communication, characterized in that, Applied to network devices, the method includes: A first reference signal and a second reference signal are transmitted using a first precoding matrix. During the transmission of the first reference signal, the array elements of the reflective device use a first weight value, and during the transmission of the second reference signal, the array elements of the reflective device use a second weight value. The first weight value is the opposite of the second weight value. The first precoding matrix is ​​used to receive the third reference signal and the fourth reference signal sent by the terminal device using the second precoding matrix, respectively. During the transmission of the third reference signal, the array element of the reflective device uses the first weight value, and during the transmission of the fourth reference signal, the array element of the reflective device uses the second weight value. Send third information to the terminal device, the third information including the third reference signal and the fourth reference signal received using the first precoding matrix respectively; The terminal device receives fourth information, which indicates the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission. The ratio of the first power amplification factor to the second power amplification factor is determined by the terminal device based on the third information and the first reference signal and the second reference signal received by the terminal device using the second precoding matrix, respectively. A second message is sent to the reflecting device, the second message indicating the ratio of the first power amplification factor to the second power amplification factor, for the reflecting device to adjust the first power amplification factor and / or the second power amplification factor.

11. The method according to claim 10, characterized in that, The first reference signal includes a first CSI-RS, and the second reference signal includes a second CSI-RS; The third reference signal includes the first SRS, and the fourth reference signal includes the second SRS.

12. The method according to claim 11, characterized in that, The third information also includes the CSI-RS resource index and SRS resource index corresponding to the first SRS received, as well as the CSI-RS resource index and SRS resource index corresponding to the second SRS received.

13. The method according to any one of claims 10 to 12, characterized in that, The method further includes: The terminal device is sent configuration information, which indicates the resources used to send the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, as well as the resource index of the resources.

14. A method of communication, characterized in that, Applied to a terminal device, the method includes: The first reference signal and the second reference signal sent by the network device using the first precoding matrix are received using the second precoding matrix. During the transmission of the first reference signal, the array element of the reflection device uses the first weight value, and during the transmission of the second reference signal, the array element of the reflection device uses the second weight value. The first weight value is the opposite of the second weight value. The second precoding matrix is ​​used to transmit the third reference signal and the fourth reference signal respectively. During the transmission of the third reference signal, the array elements of the reflective device use the first weight value, and during the transmission of the fourth reference signal, the array elements of the reflective device use the second weight value. Receive third information from the network device, the third information including the third reference signal and the fourth reference signal received by the network device using the first precoding matrix; A fourth message is sent to the network device, the fourth message indicating the ratio of the first power amplification factor of the reflecting device during uplink transmission to the second power amplification factor of the reflecting device during downlink transmission, the ratio of the first power amplification factor to the second power amplification factor being determined based on the third message and the first reference signal and the second reference signal received using the second precoding matrix, respectively.

15. The method according to claim 14, characterized in that, The method further includes: Based on the third information, the received first reference signal, and the second reference signal, the ratio of the first power amplification factor to the second power amplification factor is determined.

16. The method according to claim 14 or 15, characterized in that, The first reference signal includes a first CSI-RS, and the second reference signal includes a second CSI-RS; The third reference signal includes the first SRS, and the fourth reference signal includes the second SRS.

17. The method according to claim 16, characterized in that, The third information also includes the CSI-RS resource index and SRS resource index corresponding to the first SRS received by the network device, and the CSI-RS resource index and SRS resource index corresponding to the second SRS received by the network device.

18. The method according to any one of claims 14 to 17, characterized in that, The method further includes: The system receives configuration information from the network device, the configuration information indicating resources for transmitting the first reference signal, the second reference signal, the third reference signal, and the fourth reference signal, as well as resource indexes of the resources.

19. A communication device, characterized in that, Includes a module for performing the method as described in any one of claims 1 to 18.

20. A communication device, characterized in that, Includes a processor for implementing the method as described in any one of claims 1 to 18.

21. A communication system, characterized in that, The method includes a network device and a terminal device, wherein the network device is configured to perform the method as described in any one of claims 1 to 5, and the terminal device is configured to perform the method as described in any one of claims 6 to 9; or, the network device is configured to perform the method as described in any one of claims 10 to 13, and the terminal device is configured to perform the method as described in any one of claims 14 to 18.

22. A computer-readable storage medium, characterized in that, include: The computer-readable medium stores a computer program; When the computer program is run by the processor, the method of any one of claims 1 to 18 is performed.

23. A computer program product, characterized in that, Includes a computer program, which, when executed, causes the method as described in any one of claims 1 to 18 to be performed.

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