Communication method and communication apparatus

Abstract

Provided in the present application is a communication method. On the basis of configuration information of an SRS indicated by a first network device and a first SRS sent by a first terminal device, a second network device can determine information of a downlink channel from the second network device to the first terminal device, and can thus perform interference avoidance during communication with the first terminal device, thereby reducing the impact on downlink transmission to the first terminal device.

Description

A communication method and a communication apparatus

[0001] The present application claims priority to the Chinese Patent Application No. 202410840545.7, filed on June 26, 2024, and entitled "A communication method and a communication apparatus", 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 communication method and a communication apparatus. BACKGROUND

[0003] In a conventional mobile communication system, such as a long term evolution (LTE) system or a new radio (NR) system, a terminal device communicates with a network device, and interference occurs between the terminal device and a communication system using the same frequency band.

[0004] For example, urban air mobility (UAM) can communicate with a mobile communication base station (gNB) through a new air interface on the ground, and can use the same frequency band as the ground network, that is, the same frequency spectrum can serve both ground users and air users at the same time, thereby saving spectrum resources. However, the ground communication system can affect the UAM system, for example, the sidelobe leakage of the ground base station can interfere with the air base station in the UAM system, thereby interfering with the downlink transmission of the air user in the UAM system and reducing the throughput, reliability, and other communication performance of the downlink transmission of the air user.

[0005] Therefore, when at least two communication systems use the same frequency band to communicate, how to reduce the interference between different communication systems is a problem to be solved. SUMMARY

[0006] The present application provides a communication method, which can perform interference avoidance when communication systems using the same frequency band communicate, thereby reducing the influence of co-directional transmission.

[0007] In a first aspect, a communication method is provided, which can be executed by a network device, or can be executed by a chip or circuit or processor or chip system configured in the network device, or can be executed by a logic module or software capable of realizing all or part of the functions of the network device, and the present application does not make any limitation. Hereinafter, the second network device will be mainly taken as an example for description.

[0008] The method comprises: receiving first indication information from a first network device, the first indication information being used for indicating configuration information of at least one sounding reference signal (SRS), the configuration information of the at least one SRS being configured by the first network device for a first terminal device, the first network device being used for providing services for the first terminal device; and receiving a first SRS from the first terminal device, the first SRS belonging to the at least one SRS; wherein the first indication information and the first SRS are used for the second network device to determine information of a first channel, the information of the first channel being information of a downlink channel between the second network device and the first terminal device.

[0009] The first network device is used for providing services for the first terminal device. In other words, the first terminal device comprises a serving cell corresponding to the first network device.

[0010] The second network device is used for providing services for the second terminal device. In other words, the second terminal device comprises a serving cell corresponding to the second network device.

[0011] The first channel is used for interference avoidance.

[0012] In the above technical solution, the second network device can determine the information of the downlink channel between the second network device and the first terminal device according to the configuration information of the SRS indicated by the first network device and the first SRS sent by the first terminal device, so that interference avoidance can be performed when communicating with the first terminal device, and the influence on the downlink transmission of the first terminal device is reduced.

[0013] With reference to the first aspect, in some implementations of the first aspect, the second network device communicates with the second terminal device based on the configuration information of the at least one SRS and the first SRS.

[0014] With reference to the first aspect, in some implementations of the first aspect, second indication information is received, the second indication information being used for indicating a transmission occasion of a first downlink transmission, the first downlink transmission being a transmission between the first network device and the first terminal device.

[0015] With reference to the first aspect, in some implementations of the first aspect, the second indication information comprises at least one of the following: time window length information of the first downlink transmission, periodicity information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission.

[0016] With reference to the first aspect, in some implementations of the first aspect, the first indication information and the second indication information are the same indication information.

[0017] With reference to the first aspect, in some implementations of the first aspect, the first indication information comprises an index of the at least one SRS; or the first indication information comprises configuration information of the at least one SRS.

[0018] In this application, the configuration information of the at least one SRS can be predefined or indicated by the first network device.

[0019] With reference to the first aspect, in some implementations of the first aspect, the first indication information comprises an index of the at least one SRS, and the index of the at least one SRS corresponds to the configuration information of the at least one SRS.

[0020] In this technical solution, for the predefined configuration information of the SRS, the configuration information of each SRS corresponds to an index of the SRS.

[0021] With reference to the first aspect, in some implementations of the first aspect, the configuration information of the at least one SRS comprises at least one of the following: a time domain period, a time domain symbol, a frequency domain resource block number, a frequency domain comb interval, a group number, a group hop switch, a sequence number, a sequence hop switch, a code domain index, a comb number, a cyclic shift.

[0022] With reference to the first aspect, in some implementations of the first aspect, the second network device is configured to serve the second terminal device, and the method further comprises: determining a second SRS set, the second SRS set comprising resource mapping information of at least one SRS used by the second terminal device, and the resources of the SRSs in the second SRS set being orthogonal to the resources of the SRSs in the at least one SRS.

[0023] In this technical solution, the resources of the SRSs used by the first terminal device are orthogonal to the resources of the SRSs used by the second terminal device. In other words, the time domain, frequency domain and code domain information used by the first terminal device and the second terminal device are not completely the same. In other words, the configuration information of the SRSs used by the first terminal device and the configuration information of the SRSs used by the second terminal device are not completely the same, or in other words, the configuration information of the SRSs used by the first terminal device and the resources of the SRSs used by the second terminal device do not overlap. When the resources of the SRSs used by the first terminal device and the second terminal device remain orthogonal, the interference between the SRSs can be reduced.

[0024] The second aspect provides a communication method, which can be executed by a network device, or by a chip or circuit or processor or chip system configured in the network device, or by a logic module or software capable of implementing all or part of the functions of the network device, and the present application does not make any limitation in this regard. In the following, the first network device will be mainly taken as an example for description.

[0025] The method comprises: determining first indication information, the first indication information being used to indicate configuration information of at least one channel sounding reference signal (SRS) configured to a first terminal device, the first network device being used to provide services for the first terminal device; and sending the first indication information to a second network device, the second network device being used to provide services for a second terminal device.

[0026] The first network device is used to provide services for the first terminal device. In other words, the first terminal device comprises a serving cell corresponding to the first network device.

[0027] The second network device is used to provide services for the second terminal device. In other words, the second terminal device comprises a serving cell corresponding to the second network device.

[0028] The first channel is used for interference avoidance.

[0029] In the above technical solution, the first network device can indicate the configuration information of the SRS configured to the first terminal device to the second network device, so that the second network device can determine the information of the downlink channel from the second network device to the first terminal device in combination with the first SRS sent by the first terminal device, thereby performing interference avoidance when communicating with the first terminal device and reducing the influence on the downlink transmission of the first terminal device.

[0030] With reference to the second aspect, in some implementations of the second aspect, the second indication information is sent, the second indication information being used to indicate a transmission occasion of the first downlink transmission, the first downlink transmission being a transmission between the first network device and the first terminal device.

[0031] With reference to the second aspect, in some implementations of the second aspect, the second indication information comprises at least one of the following: time window length information of the first downlink transmission, period information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission.

[0032] With reference to the second aspect, in some implementations of the second aspect, the first indication information and the second indication information are the same indication information.

[0033] With reference to the second aspect, in some implementations of the second aspect, the first indication information comprises an index of the at least one SRS; or the first indication information comprises configuration information of the at least one SRS.

[0034] With reference to the second aspect, in some implementations of the second aspect, the first indication information comprises an index of the at least one SRS, and the index of the at least one SRS corresponds to configuration information of the at least one SRS.

[0035] With reference to the second aspect, in some implementations of the second aspect, the configuration information of the at least one SRS comprises at least one of a time domain period, a time domain symbol, a frequency domain resource block number, a frequency domain comb interval, a group number, a group hop switch, a sequence number, a sequence hop switch, a code domain index, a comb number, and a cyclic shift.

[0036] With reference to the first aspect and the second aspect, in some implementations of the first aspect or the second aspect, the first network device and the first terminal device belong to a first communication system, the second network device and the second terminal device belong to a second communication system, and the first communication system and the second communication system use a same frequency band for communication.

[0037] With reference to the first aspect and the second aspect, in some implementations of the first aspect or the second aspect, the first communication system is a UAM system, and the second communication system is a ground communication system.

[0038] Based on the above technical solution, for the UAM system and the ground communication system using the same frequency band for communication, the ground access network device in the ground communication system can determine the downlink channel information to the air user in the UAM system, so as to perform interference avoidance based on the downlink channel information and reduce the influence on the downlink transmission of the air user.

[0039] In a third aspect, a communication method is provided, which can be executed by a first terminal device, or can be executed by a chip or circuit or processor or chip system configured in the first terminal device, or can be executed by a logic module or software capable of implementing all or part of the functions of the first terminal device, and the present application does not make any limitation in this regard.

[0040] The method comprises: sending a first SRS to a second network device, the first SRS belonging to at least one SRS, and configuration information of the at least one SRS being configured by a first network device to the first terminal device; wherein the first SRS and the configuration information of the at least one SRS are used by the second network device to determine information of a first channel, and the information of the first channel is information of a downlink channel between the second network device and the first terminal device.

[0041] In the technical solution, the first terminal device can send the first SRS to the second network device, so that the second network device can determine information of a downlink channel from the second network device to the first terminal device according to configuration information of the SRS configured by the first network device to the first terminal device, and thus the second network device can perform interference avoidance when communicating with the first terminal device, and reduce the influence on the downlink transmission of the first terminal device.

[0042] In a fourth aspect, a communication apparatus is provided. The apparatus can be a network device, or a chip, circuit, processor or chip system configured in the network device, or a logic module or software capable of implementing all or part of the functions of the network device, which is not limited in the application. Hereinafter, the second network device is taken as an example for description.

[0043] The apparatus includes: a transceiver configured to receive first indication information from a first network device, the first indication information being used to indicate configuration information of at least one channel sounding reference signal (SRS), the configuration information of the at least one SRS being configured by the first network device to a first terminal device, and the first network device being used to provide services for the first terminal device; and the transceiver is further configured to receive a first SRS from the first terminal device, the first SRS belonging to the at least one SRS; wherein the first indication information and the first SRS are used by the second network device to determine information of a first channel, the information of the first channel being information of a downlink channel between the second network device and the first terminal device.

[0044] With reference to the fourth aspect, in some implementations of the fourth aspect, the apparatus further includes a processing unit configured to communicate with a second terminal device based on the configuration information of the at least one SRS and the first SRS.

[0045] With reference to the fourth aspect, in some implementations of the fourth aspect, the transceiver is further configured to receive second indication information, the second indication information being used to indicate a transmission occasion of a first downlink transmission, and the first downlink transmission being a transmission between the first network device and the first terminal device.

[0046] With reference to the fourth aspect, in some implementations of the fourth aspect, the second indication information includes at least one of the following: time window length information of the first downlink transmission, periodicity information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission.

[0047] With reference to the fourth aspect, in some implementations of the fourth aspect, the first indication information and the second indication information are the same indication information.

[0048] In some implementations of the fourth aspect, the first indication information includes an index of the at least one SRS; or the first indication information includes configuration information of the at least one SRS.

[0049] In the present application, the configuration information of the at least one SRS can be predefined or indicated by the first network device.

[0050] In some implementations of the fourth aspect, the first indication information includes an index of the at least one SRS, and the index of the at least one SRS corresponds to the configuration information of the at least one SRS.

[0051] In the technical solution, for the predefined configuration information of the SRS, the configuration information of each SRS corresponds to an index of the SRS.

[0052] In some implementations of the fourth aspect, the configuration information of the at least one SRS includes at least one of the following: a time domain period, a time domain symbol, a frequency domain resource block number, a frequency domain comb interval, a group number, a group hop switch, a sequence number, a sequence hop switch, a code domain index, a comb number, and a cyclic shift.

[0053] In some implementations of the fourth aspect, the method further includes: the processing unit is further configured to determine a second SRS set, the second SRS set includes resource mapping information of at least one SRS used by the second terminal device, and the resources of the SRSs in the second SRS set are orthogonal to the resources of the SRSs in the at least one SRS.

[0054] In the fifth aspect, a communication device is provided, which can be a network device, or a chip or circuit or processor or chip system configured in the network device, or a logic module or software capable of realizing all or part of the functions of the network device, and the present application does not make any limitation in this regard. In the following, the first network device is mainly taken as an example for description.

[0055] The device includes: a processing unit configured to determine first indication information, the first indication information being used to indicate configuration information of at least one channel sounding reference signal (SRS) configured to a first terminal device, and the first network device being used to provide services to the first terminal device; and a transceiver unit configured to send the first indication information to a second network device, the second network device being used to provide services to a second terminal device.

[0056] In some implementations of the fifth aspect, in conjunction with the fifth aspect, the transceiving unit is further configured to send second indication information, the second indication information being used to indicate a transmission occasion of the first downlink transmission, the first downlink transmission being a transmission between the first network device and the first terminal device.

[0057] In some implementations of the fifth aspect, in conjunction with the fifth aspect, the second indication information includes at least one of time window length information of the first downlink transmission, periodicity information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission.

[0058] In some implementations of the fifth aspect, in conjunction with the fifth aspect, the first indication information and the second indication information are the same indication information.

[0059] In some implementations of the fifth aspect, in conjunction with the fifth aspect, the first indication information includes an index of the at least one SRS; or the first indication information includes configuration information of the at least one SRS.

[0060] In some implementations of the fifth aspect, in conjunction with the fifth aspect, the first indication information includes an index of the at least one SRS, and the index of the at least one SRS corresponds to configuration information of the at least one SRS.

[0061] In some implementations of the fifth aspect, in conjunction with the fifth aspect, the configuration information of the at least one SRS includes at least one of a time domain periodicity, a time domain symbol, a frequency domain resource block number, a frequency domain comb interval, a group number, a group hop switch, a sequence number, a sequence hop switch, a code domain index, a comb number, a cyclic shift of the at least one SRS.

[0062] In some implementations of the fourth aspect or the fifth aspect, in conjunction with the fourth aspect and the fifth aspect, the first network device and the first terminal device belong to a first communication system, the second network device and the second terminal device belong to a second communication system, and the first communication system and the second communication system use the same frequency band for communication.

[0063] In some implementations of the fourth aspect or the fifth aspect, in conjunction with the fourth aspect and the fifth aspect, the first communication system is an urban air traffic system, and the second communication system is a ground communication system.

[0064] A sixth aspect provides a communication apparatus, which can be a first terminal device, or can be a chip or circuit or processor or chip system configured in the first terminal device, or can be a logic module or software capable of realizing all or part of the functions of the first terminal device, and the present application does not make any limitation in this regard.

[0065] The apparatus comprises a transceiver configured to send a first SRS to a second network device, the first SRS belonging to at least one SRS, configuration information of the at least one SRS being configured by a first network device to the first terminal device; wherein the first SRS and the configuration information of the at least one SRS are used by the second network device to determine information of a first channel, the information of the first channel being information of a downlink channel between the second network device and the first terminal device.

[0066] In a seventh aspect, a communication apparatus is provided, which is configured to execute the method in any of the first aspect to the third aspect. Specifically, the communication apparatus can include units and / or modules configured to execute the method in any of the first aspect to the third aspect and / or any of the implementation manners of the first aspect to the third aspect, such as a processing unit and / or a communication unit.

[0067] In an implementation manner, the communication apparatus includes a communication unit and a processing unit. The communication unit can be a transceiver, or an input / output interface. The processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0068] In another implementation manner, the communication apparatus is a chip, a chip system or a circuit in a network device. When the communication apparatus is a chip, a chip system or a circuit in a network device, the communication unit can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip, the chip system or the circuit, etc. The processing unit can be at least one processor, a processing circuit or a logic circuit, etc.

[0069] In an eighth aspect, a communication apparatus is provided, which includes a processor and optionally a memory. The processor is configured to control a transceiver to transceive signals. The memory is configured to store a computer program. The processor is configured to invoke and run the computer program from the memory, so that the sending device executes the method in any of the implementation manners of the first aspect to the third aspect.

[0070] Optionally, the processor is one or more processors, and the memory is one or more memories.

[0071] Optionally, the memory can be integrated with the processor, or the memory is arranged separately from the processor.

[0072] Optionally, the network device further includes a transceiver, which specifically can be a transmitter (transmitter) and a receiver (receiver).

[0073] In a ninth aspect, a computer-readable storage medium is provided, which stores a computer program or code, which, when executed on a computer, causes the computer to perform the method in any possible implementation of any of the first aspect to the third aspect.

[0074] In a tenth aspect, a chip is provided, which comprises at least one processor coupled with a memory for storing a computer program, and the processor is configured to invoke and execute the computer program from the memory, so that a sending device installed with the chip system performs the method in any possible implementation of any of the first aspect to the third aspect.

[0075] The chip can comprise an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0076] In an eleventh aspect, a computer program product is provided, which comprises computer program code, which, when executed on a sending device, performs the method in any possible implementation of any of the first aspect to the third aspect.

[0077] The beneficial effects of the fourth aspect to the eleventh aspect can refer to the beneficial effects of the first aspect to the third aspect, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0078] FIG. 1 is an exemplary architecture diagram of a communication system 100 suitable for embodiments of the present application.

[0079] FIG. 2 is an application architecture diagram of a communication system suitable for embodiments of the present application.

[0080] FIG. 3 is an application architecture diagram of a communication system suitable for embodiments of the present application.

[0081] FIG. 4 is an application architecture diagram of a communication system suitable for embodiments of the present application.

[0082] FIG. 5 is a schematic flowchart of a communication method 500 suitable for embodiments of the present application.

[0083] FIG. 6 is a timing diagram of a periodic service suitable for embodiments of the present application.

[0084] FIG. 7 is a timing diagram of an aperiodic service suitable for embodiments of the present application.

[0085] FIG. 8 is a schematic flowchart of a communication method 800 suitable for embodiments of the present application.

[0086] FIG. 9 is a structural schematic diagram of a communication apparatus 900 provided in an embodiment of the present application.

[0087] FIG. 10 is a schematic diagram of a communication architecture 1000 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0088] The technical solutions in the present application will be described below with reference to the drawings.

[0089] The technical solutions provided in the present application can be applied to various communication systems, for example, a new radio (NR) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, and the like. The technical solutions provided in the present application can also be applied to future communication systems. The technical solutions provided in the present application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and internet of things (IoT) communication systems. The technical solutions provided in the present application can also be applied to low frequency scenarios, high frequency scenarios, terahertz, and the like.

[0090] The technical solutions provided in the present application can also be applied to non-terrestrial network (NTN) systems such as inter-satellite communication and satellite communication. As an example, a satellite communication system includes a satellite base station and a terminal device. The satellite base station provides communication services for the terminal device. The satellite base station can also communicate with a base station. The satellite can act as a base station or a terminal device. The satellite can refer to a drone, a hot air balloon, a low earth orbit satellite, a medium earth orbit satellite, a high earth orbit satellite, and the like. The satellite can also refer to a non-ground base station or a non-ground device, and the like.

[0091] A device in a communication system can send a signal to another device or receive a signal from another device. The signal can include information, signaling, data, and the like. The device can be replaced by an entity, a network entity, a network element, a communication device, a communication module, a node, a communication node, and the like. The present disclosure describes the device as an example. For example, the communication system can include at least one terminal device and at least one network device. The network device can send a downlink signal to the terminal device, and / or the terminal device can send an uplink signal to the network device.

[0092] The terminal device in the embodiments of the present application can be a device or module with corresponding communication functions for accessing the above-mentioned communication system. The terminal device can include various devices with wireless communication functions, which can be used to connect people, things, machines, etc. The terminal device can be widely used in various scenarios, such as cellular communication, D2D, V2X, peer to peer, M2M, MTC, IoT, virtual reality (VR), augmented reality (AR), industrial control, autonomous driving, remote medical treatment, smart power grid, smart furniture, smart office, smart wear, smart transportation, smart city UAV, robot, remote sensing, passive sensing, positioning, autonomous delivery, etc. The terminal device can be a terminal in any of the above scenarios, such as an MTC terminal, an IoT terminal, etc. The terminal device can be a user equipment (UE) of the 3rd generation partnership project (3GPP) standard, a terminal, a fixed device, a mobile station device or a mobile device, a subscriber unit, a handset, a vehicle-mounted device, a wearable device, a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a wireless data card, a personal digital assistant (PDA), a computer, a tablet computer, a notebook computer, a wireless modem, a handset, a laptop computer, a computer with wireless transceiver function, a smart book, a vehicle, a satellite, a global positioning system (GPS) device, an aircraft (such as a drone, a helicopter, a multi-copter, a quad-copter, or an airplane, etc.), a ship, a remote control device smart home device, an industrial device, a transport vehicle with wireless communication function, a communication module, a road side unit (RSU) with terminal function, or a device built-in in the above-mentioned device (such as a communication module, a modem or a chip in the above-mentioned device, etc.), or other processing devices connected to the wireless modem. For the convenience of description, the terminal device will be described as an example of a terminal or UE hereinafter.

[0093] It should be understood that in certain scenarios, the UE can also be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X, D2D, or end-to-end scenarios, etc.

[0094] In the embodiments of the present application, the device for realizing the function of the terminal device, i.e., the terminal device, can be a terminal device or a device capable of supporting the terminal device to realize the function, such as a chip system or a chip or a circuit or a communication module (i.e., a communication module performing a communication function), which can be installed in 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. In addition, program instructions for performing corresponding communication functions can also be configured in the device.

[0095] The network device in the embodiments of the present application can be a device or module with corresponding communication function. The network device can be a device for communicating with a terminal device, and the network device can also be referred to as an access network device or a radio access network device, for example, the network device can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) for accessing a terminal device to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmission point, primary station, secondary station, motor slide retainer (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip for being arranged in the foregoing device or apparatus. The base station can also be a mobile switching center and a device assuming a base station function in D2D, V2X, M2M communication, a device assuming a base station function in a future communication system, etc. The base station can support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0096] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, the helicopter or the drone can be configured to serve as a device communicating with another base station.

[0097] In some deployments, the network device mentioned by embodiments of the application can be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit-control plane (CU-CP)) and a user plane CU node (central unit-user plane (CU-UP)) and a DU node. For example, the network device can include a gNB-CU-CP, a gNB-CU-UP and a gNB-DU.

[0098] In some deployments, a plurality of RAN nodes cooperate to assist a terminal to implement wireless access, and different RAN nodes respectively implement part of the functions of a base station. For example, the RAN node can be a CU, a DU, a CU-CP, a CU-UP, or a radio unit (RU) (or radio frequency unit), etc. The CU and the DU can be separately arranged, or can be included in the same network element, such as a BBU. The RU can be included in a radio frequency device or a radio frequency unit, such as an RRU, an AAU or an RRH.

[0099] In some deployments, the CU is a logical node that carries the radio resource control (RRC) layer, the service data adaptation protocol (SDAP) layer, the packet data convergence protocol (PDCP) layer and other control functions of the access network device. The CU is connected to network nodes such as core networks through some interfaces, which can be E2 interfaces, etc. Optionally, the CU has part of the functions of the core network. The CU (such as the PDCP layer and higher layers) is connected to the DU (such as the radio link control (RLC) layer and lower layers) through some interfaces, which can be F1 interfaces, etc. In some examples, these interfaces (such as the F1 interface) can provide control plane (C-Plane) and user plane (U-Plane) functions (such as interface management, system information management, UE context management, RRC message transmission, etc.). The F1 application protocol (F1AP) is an application protocol of the F1 interface, which defines the signaling procedures of the F1 in some examples. The F1 interface supports the control plane (F1 control plane, F1-C), the user plane (F1 user plane, F1-U).

[0100] In some deployments, a CU can be split into a CU-CP and a CU-UP. The CU-CP is a logical node that carries the control plane part of PDCP (PDCP-C) layer and RRC layer, and is used to implement the control plane function of the CU. The CU-CP can interact with a network element in the core network that is used to implement the control plane function. The network element in the core network that is used to implement the control plane function can be an access and mobility function network element. The CU-UP is a logical node that carries the user plane part of PDCP (PDCP-U) layer and SDAP layer, and is used to implement the user plane function of the CU. The CU-UP can interact with a network element in the core network that is used to implement the user plane function. The network element in the core network that is used to implement the user plane function. The above configurations of the CU and the DU are merely examples, and the CU and the DU can have other functions according to needs. For example, the CU or the DU can be configured to have more protocol layer functions, or the CU or the DU can be configured to have partial processing functions of the protocol layers. For example, partial functions of the RLC layer and functions of the protocol layers above the RLC layer are arranged in the CU, and the remaining functions of the RLC layer and functions of the protocol layers below the RLC layer are arranged in the DU. For another example, the functions of the CU or the DU can be divided according to service types or other system requirements. For example, functions that need to meet a relatively short delay requirement in processing time are arranged in the DU, and functions that do not need to meet the delay requirement are arranged in the CU.

[0101] In some deployments, a DU is a logical node that carries an RLC layer, a medium access control (MAC) layer, a higher physical (Higher PHY) layer, and other functions. In some examples, a DU can control at least one RU. The DU is connected to the RU through some interfaces, which can be a front-haul interface. In some examples, the Higher PHY layer includes part of the PHY layer processing, such as forward error correction (FEC) encoding and decoding, scrambling, modulation and demodulation, and other processing functions.

[0102] In some deployments, a RU is a logical node that hosts lower physical layer (Lower PHY) and radio frequency (RF) processing. In some examples, a RU can be a TRP or a RRH or other similar functional entity. In some examples, a Low-PHY includes portions of PHY processing such as fast Fourier transform (FFT), inverse fast Fourier transformation (IFFT), digital beamforming and filtering, and other processing functions. A RU communicates with one or more UEs over a wireless link.

[0103] A DU and a RU can or can not be co-located. A DU and a RU exchange control plane and user plane information over a fronthaul link via a lower-layer split-control, user and synchronization (LLS-CUS) interface. The LLS-CUS can include interfaces and interfaces that provide control plane and user plane, respectively. In some examples, the control plane refers to real-time control between a DU and a RU. A DU and a RU have an interface of a fronthaul link (e.g., referred to as a LLS-M interface) to exchange management information, and the management plane (M-Plane) refers to non-real-time management operations between a DU and a RU.

[0104] A DU and a RU can cooperate to collectively implement the functionality of a PHY layer. A DU can be connected to one or more RUs. The functionality that a DU and a RU have can be configured in multiple ways according to design. For example, a DU is configured to implement baseband functionality and a RU is configured to implement mid- RF functionality. As another example, a DU is configured to implement high layer functionality in a PHY layer and a RU is configured to implement low layer functionality in the PHY layer or to implement the low layer functionality and RF functionality. The high layer functionality in a PHY layer can include a portion of functionality of a PHY layer that is closer to a MAC layer, and the low layer functionality in a PHY layer can include another portion of functionality of a PHY layer that is closer to a mid-RF side.

[0105] In one possible design, a processing unit in a BBU that implements baseband functionality is referred to as a base band high (BBH) unit, and a processing unit in a RRU / AAU / RRH that implements baseband functionality is referred to as a base band low (BBL) unit.

[0106] The CU (or CU-CP and CU-UP), DU, or RU can also have different names in different systems, but those skilled in the art can understand their meanings. For example, the radio access network can also be an open radio access network (O-RAN) architecture, in which the CU can also be referred to as an open CU (O-CU), the DU can also be referred to as an open DU (O-DU), the CU-CP can also be referred to as an open CU-CP (O-CU-CP), the CU-UP can also be referred to as an open CU-UP (O-CU-UP), and the RU can also be referred to as an open RU (O-RU). Any of the CUs (or CU-CPs, CU-UPs), DUs, and RUs in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0107] In the embodiments of the present application, the device for implementing the function of the network device can be a network device, or a device capable of supporting the network device to implement the function, such as a chip system or a chip or a circuit or a communication module (i.e., a communication module performing a communication function), which can be installed in the network 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. In addition, program instructions for performing corresponding communication functions can also be configured in the device. In the embodiments of the present application, only the device for implementing the function of the network device is taken as an example for description, and the scheme of the embodiments of the present application is not limited.

[0108] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water surface; and can also be deployed on aircraft, balloons, and satellites in the air. The embodiments of the present application do not limit the scenarios in which the network device and the terminal device are located. In addition, the terminal device and the network device can be hardware devices, or software functions running on special-purpose hardware, general-purpose hardware, such as virtualized functions instantiated on a platform (for example, a cloud platform), or entities including special-purpose or general-purpose hardware devices and software functions. The specific forms of the terminal device and the network device are not limited in the present application.

[0109] First, a communication system suitable for the embodiments of the present application is briefly introduced as follows.

[0110] Referring to FIG. 1, as an example, FIG. 1 is an exemplary architecture diagram of a communication system 100 applicable to embodiments of the present application. As shown in FIG. 1, the communication system 100 can include at least one network device, such as the network device 101 shown in FIG. 1. The communication system 100 can also include at least one terminal device, such as the terminal devices 102-107 shown in FIG. 1. The terminal devices 102-107 can be mobile or fixed. The network device 101 can provide communication coverage for a specific geographic area, and the terminal devices 102-107 can be terminal devices located within the coverage area. The network device 101 and one or more of the terminal devices 102-107 can communicate via wireless links.

[0111] Optionally, the terminal devices can communicate directly with each other. Direct communication between terminal devices can be implemented, for example, using device to device (D2D) technology. As shown in FIG. 1, the terminal device 105 and the terminal device 106, and the terminal device 105 and the terminal device 107 can communicate directly using D2D technology. The terminal device 106 and the terminal device 107 can communicate with the terminal device 105 separately or simultaneously.

[0112] The terminal devices 105-107 can also communicate with the network device 101 respectively. For example, the terminal devices 105 and 106 can communicate directly with the network device 101, and the terminal device 107 can communicate with the network device 101 indirectly via the terminal device 105.

[0113] Each of the communication devices in the communication system 100 shown in FIG. 1 can be configured with multiple antennas. For each communication device, the multiple antennas can include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Therefore, the communication devices in the communication system 100 can communicate with each other via multiple input multiple output (MIMO) technology.

[0114] It should be understood that FIG. 1 is a simplified schematic diagram shown by way of example for ease of understanding, and the communication system 100 can include other network devices or can include other terminal devices, which are not shown in FIG. 1.

[0115] It should also be understood that the communication system 100 shown in FIG. 1 is only an example of an application scenario of embodiments of the present application, and the present application can also be applicable to communication between any two devices, for example, communication between terminal devices or communication between network devices.

[0116] Referring to FIG. 2, as an example, FIG. 2 shows an application architecture diagram of a communication system. As an example, the architecture can include a RAN, a terminal device, a core network (CN), an external network, and the like. The external network can be a data network (DN), and the RAN refers to a wireless network device provided in the present application, or is referred to as a RAN device or an access network device, and the like.

[0117] The terminal device and the access network device can communicate with each other by using a certain air interface technology (such as NR or LTE technology, etc.). The terminal device and the terminal device can also communicate with each other by using a certain air interface technology (such as NR or LTE technology, etc.).

[0118] In the embodiments of the present application, the device for implementing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system or a chip, which can be installed in 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.

[0119] Referring to FIG. 3, as an example, FIG. 3 shows an application architecture diagram of a communication system. As an example, the architecture can include at least two communication systems, for example, the access network device 301 and the terminal device 302 in FIG. 3 form a communication system 310, and the access network device 303 and the terminal device 304 in FIG. 3 form a communication system 320.

[0120] In the communication system 310 and the communication system 320, the access network device 301 and the terminal device 302, and the access network device 303 and the terminal device 304 can transmit data and pilots through the air interface, and at the same time, the access network device 301 and the access network device 303 can not transmit information through the air interface.

[0121] The communication system 310 and the communication system 320 can be an NR system or a future communication system, and the embodiments of the present application do not limit this.

[0122] It should be understood that the above-mentioned communication system 310 and communication system 320 can also be understood as two subsystems in one communication system.

[0123] It should be understood that the above-mentioned communication system 310 and communication system 320 can use the same frequency band for communication, but will interfere with each other.

[0124] As an example, the communication system 310 is a UAM system, and the communication system 320 is a ground communication system.

[0125] Referring to FIG. 4, as an example, FIG. 4 shows a schematic diagram of an application architecture of a communication system. As an example, in the architecture, at least two communication systems can be included, for example, the access network device 401 and the user equipment 402 in FIG. 4 form a UAM system 410, and the access network device 403 and the user equipment 404 in FIG. 4 form a ground communication system 420.

[0126] It should be understood that FIG. 4 is only a simplified schematic diagram for example, and the UAM system 410 or the ground communication system 420 can further include other access network devices and user equipment, which are not shown in FIG. 4.

[0127] In the present application, in the UAM system 410, the access network device 401 can provide services to the aerial user (the user equipment 402) as an air-to-space access network device.

[0128] In the present application, in the UAM system 410, the access network device 401 can provide services to the aerial user (the user equipment 402) as an air-to-space access network device.

[0129] Therefore, the present application provides a communication method, which can perform interference avoidance when the communication systems using the same frequency band perform communication, and reduce the influence of the same direction transmission.

[0130] Before introducing the scheme of the present application, the following points are explained.

[0131] (1) In the present application, “indication” can include direct indication, indirect indication, explicit indication, and implicit indication. When it is described that a certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0132] In the present application, the information indicated by the indication information is referred to as to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information, for example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or the index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, wherein the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be only indicated in part, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be realized by means of the arrangement order of each information agreed in advance (for example, the protocol stipulates), thereby reducing the indication overhead to a certain extent. In addition, the to-be-indicated information can be sent as a whole, or can be sent separately into multiple sub-information, and the sending period and / or sending opportunity of these sub-information can be the same or different.

[0133] (2) In the present application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as that the destination of the information is XX, which can include direct sending through the air interface, or indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as that the source of the information is YY, which can include direct receiving from YY through the air interface, or indirect receiving from YY through the air interface from other units or modules. "Sending" can also be understood as "output" of the chip interface, and "receiving" can also be understood as "input" of the chip interface. In other words, sending and receiving can be carried out between devices, for example, between network devices and terminal devices, or can be carried out within a device, for example, between components, modules, chips, software modules or hardware modules within a device through a bus, wire or interface.

[0134] (3) In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referenced if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0135] (4) In the present application, "first", "second", and "#1", "#2", and "#n1", "#n2" and the like are only for convenience of description and are used for distinguishing objects, and are not used to limit the scope of the embodiments of the present application. They are not used to describe the order or sequence of the characteristics. It should be understood that the objects thus described can be interchanged under appropriate circumstances, so as to be able to describe schemes other than the embodiments of the present application.

[0136] (5) In the present application, "predefined" can mean standard protocol predefined, or can also mean pre-agreed or pre-negotiated between devices.

[0137] (6) In this application, the words "example", "such as", and the like are used to mean example, illustration, or description. Any embodiment or design solution described as "example" in this application should not be interpreted as more preferred or more advantageous than other embodiments or design solutions. Rather, the word "example" is used to present the concept in a specific manner. In the embodiments of this application, "of", "corresponding" and "corresponding" are sometimes mixed. It should be pointed out that when their differences are not emphasized, their meanings expressed are consistent.

[0138] The method provided by the embodiments of the application will be described in detail below with reference to the drawings. The embodiments provided by the application can be applied to the communication system shown in Figure 1, without limitation.

[0139] In the following embodiments, the first network function and the communication device are exemplarily illustrated. The first network function can be replaced by a component (such as a chip or a chip system or a circuit) of the first network function, and the communication device can be replaced by a component (such as a chip or a chip system or a circuit) of the communication device.

[0140] The communication method provided by the embodiments of the application will be described in detail below with reference to the drawings. The embodiments provided by the application can be applied to the communication system shown in Figure 1, without limitation.

[0141] In the following embodiments, the interaction between the first network device and the second network device is exemplarily illustrated. The first network device can be replaced by a component (such as a chip or a chip system or a circuit) of the first network device, and the second network device can be replaced by a component (such as a chip or a chip system or a circuit) of the second network device.

[0142] Referring to Figure 5, as an example, Figure 5 is a schematic flowchart of a communication method 500 provided by an embodiment of the application. The method 500 shown in Figure 5 can include the following steps.

[0143] 510, the second network device receives the first indication information from the first network device. Correspondingly, the first network device sends the first indication information to the second network device.

[0144] The first network device is configured to provide services to the first terminal device. In other words, the service cell of the first network device serves the first terminal device. As an example, the first network function is the access network device 401 in the network structure shown in Figure 4, and the first terminal device is the user equipment 402 shown in Figure 4.

[0145] The second network device is configured to provide services to the second terminal device. In other words, the second terminal device comprises a service cell corresponding to the second network device. As an example, the second network device is the access network device 403 in the network structure shown in FIG. 4, and the second terminal device is the user equipment 404 shown in FIG. 4.

[0146] The first network device and the first terminal device belong to a first communication system, and the second network device and the second terminal device belong to a second communication system. The first communication system and the second communication system use the same frequency band for communication.

[0147] For example, the first communication system and the second communication system both use the n79 time division duplex (TDD) frequency band, and the frequency range corresponds to 4400 MHz (MHz) - 5000 MHz.

[0148] The first indication information is used to indicate configuration information of at least one SRS. The configuration information of the at least one SRS is configured by the first network device for the first terminal device.

[0149] It can be understood that the first network device can select appropriate configuration parameters for SRS configuration according to the capability of the first terminal device and the demand of the system. For example, the first network device sends these configuration parameters to the first terminal device through high layer signaling. After receiving these configuration parameters, the first terminal device can send SRS according to the parameters, so that the first network device can accurately estimate the uplink channel quality and perform resource scheduling and beam management. The configuration parameters can be a set of configuration parameters.

[0150] As an example, the configuration information of the at least one SRS includes at least one of the following: time domain period, time domain symbol, frequency domain resource block number, frequency domain comb interval, group number, group hop switch, sequence number, sequence hop switch, code domain index, comb number, cyclic shift, etc.

[0151] It can be understood that in the present application, the first network device not only sends the configuration information of the at least one SRS to the first terminal device, but also indicates the configuration information of the at least one SRS to the second network device.

[0152] As an example, the first network device can send the first indication information to the second network device through the Xn interface.

[0153] The following describes the manner in which the first indication information indicates the configuration information of the at least one SRS.

[0154] In the present application, the configuration information of the at least one SRS can be predefined or indicated by the first network device.

[0155] In a possible implementation, the first indication information includes an index of the at least one SRS.

[0156] In this implementation, the first network device, the second network device, and the first terminal device have predefined a set of SRSs (at least one SRS) of the first terminal device, and the first network device can indicate, to the second network device, an index of an SRS configured for the first terminal device through the first indication information. In this case, the at least one SRS index corresponds to configuration information of the at least one SRS, or in other words, one SRS index corresponds to configuration information of one SRS, or in other words, the second network device can determine the configuration information of the at least one SRS based on the at least one SRS index indicated by the first indication information.

[0157] For example, the at least one SRS index can be an SRS resource set index SRS-ResourceSetId, or an SRS resource index SRS-ResourceId, or another index used to distinguish SRSs. The embodiments of the present application do not limit this.

[0158] In another possible implementation, the first indication information includes configuration information of the at least one SRS.

[0159] In this implementation, the first network device, the second network device, and the first terminal device have predefined a set of SRSs (at least one SRS) of the first terminal device, and the first network device can indicate, to the first network device, configuration information of an SRS configured for the first terminal device through the first indication information. In other words, the first indication information can include time domain period, time domain symbol, frequency domain resource block number, frequency domain comb interval, group number, group hop switch, sequence number, sequence hop switch, code domain index, comb number, cyclic shift, and the like of the at least one SRS.

[0160] In an optional implementation, resources of SRSs in the first set of SRSs (the at least one SRS) are orthogonal to resources of SRSs in a second set of SRSs. In this case, the second set of SRSs is a set of SRSs used by a second terminal device. In other words, resources of SRSs used by the first terminal device are orthogonal to resources of SRSs used by the second terminal device. It can also be understood that time domain, frequency domain, and code domain information used by the first terminal device and the second terminal device are not completely the same. It can also be understood that configuration information of SRSs used by the first terminal device and configuration information of SRSs used by the second terminal device are not completely the same, or in other words, there is no overlap between resources of SRSs used by the first terminal device and resources of SRSs used by the second terminal device.

[0161] It can be understood that when resources of SRSs used by the first terminal device and the second terminal device are kept orthogonal, interference between SRSs can be reduced.

[0162] Optionally, the method 500 further comprises step 501.

[0163] 501, the second network device receives the second indication information from the first network device. Correspondingly, the first network device sends the second indication information to the second network device.

[0164] The second indication information is used to indicate a transmission occasion of the first downlink transmission, the first downlink transmission being a downlink transmission between the first network device and the first terminal device.

[0165] As an example, the second indication information can comprise at least one of the following: time window length information of the first downlink transmission, periodicity information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission.

[0166] The time window length information of the first downlink transmission indicates that the first terminal device and the first network device perform downlink transmission within the time window. As an example, the time window length information of the first downlink transmission can be M minimum time units, M being a positive integer greater than 1. The N minimum time units can be at least one of the following: M symbols, M time slots, M subframes, or M frames. The embodiments of the present application do not limit this.

[0167] The periodicity information of the first downlink transmission can be a transmission periodicity of the first network device sending downlink data to the first terminal device, or a reception periodicity of the first terminal device receiving downlink data of the first network device. As an example, the periodicity information of the first downlink transmission can be N minimum time units, N being a positive integer greater than 1. The N minimum time units can be at least one of the following: N symbols, N time slots, N subframes, or N frames. The embodiments of the present application do not limit this.

[0168] The time point information of the first downlink transmission can be a transmission time point of the first network device sending downlink data to the first terminal device, or a reception time point of the first terminal device receiving downlink data of the first network device. As an example, the time point information of the first downlink transmission can be the i-th minimum time unit, i being a positive integer greater than 0. The i-th minimum time unit can be at least one of the following: the i-th symbol, the i-th time slot, the i-th subframe, or the i-th frame. The embodiments of the present application do not limit this.

[0169] The duration information of the first downlink transmission can be a duration of sending downlink data by the first network device to the first terminal device, or a duration of receiving downlink data of the first network device by the first terminal device. As an example, the duration information of the first downlink transmission can be n minimum time units, where n is a positive integer greater than 1. The n minimum time units can be at least one of n symbols, n slots, n subframes, or n frames. The embodiments of the present application do not limit this.

[0170] Referring to FIG. 6, as an example, FIG. 6 shows a timing diagram of a periodic service. The first terminal device receives downlink data of the first network device at the i, i+1, …, i+(n-1) time units, or in other words, at the N+i, N+i+1, …, N+i+(n-1) time units.

[0171] Optionally, for the aperiodic service, when the second indication information includes the length information of the time window of the first downlink transmission, the second indication information can further include the effective time information of the time window of the first downlink transmission, or in other words, the time information of receiving downlink data by the first terminal device, or the time information of sending downlink data by the first network device.

[0172] Referring to FIG. 7, as an example, FIG. 7 shows a timing diagram of an aperiodic service. The second indication information indicates a time at which the first terminal device starts to receive downlink data of the first network device within a time window, and the first terminal device receives downlink data of the first network device from the time at which the first terminal device starts to receive downlink data of the first network device within the time window until the end of the time window.

[0173] Optionally, the first indication information and the second indication information are two indication information carried in one information, or can be the same indication information carried in one information. They can also be two indication information carried in different information. The embodiments of the present application do not limit this.

[0174] It should be noted that the transmission occasion of the first downlink transmission can be predefined, or can be indicated by the second indication information, and the embodiments of the present application do not limit this.

[0175] 520, the second network device receives the first SRS from the first terminal device. Correspondingly, the first terminal device sends the first SRS to the second network device. The first SRS belongs to the at least one SRS.

[0176] It can be understood that the first terminal device sends the first SRS to the second network device based on the configuration information of the at least one SRS configured by the first network device.

[0177] In the above method, the first indication information and the first SRS received by the second network device are used by the second network device to determine information of the first channel, and the information of the first channel is information of a downlink channel between the second network device and the first terminal device.

[0178] The first channel is used for interference avoidance.

[0179] Optionally, the method 500 can further include step 530.

[0180] 530, the second network device communicates with the second terminal device based on the first indication information and the first SRS.

[0181] The second network device can determine information of the first channel according to the first indication information and the first SRS, and can perform interference avoidance on the first channel when the second network device communicates with the second terminal device.

[0182] In one possible implementation, the second network device can determine the SRS original sequence sent by the first terminal device based on the first indication information, and estimate the downlink channel (the first channel) between the second network device and the first terminal device based on the first SRS after channel compensation and the channel reciprocity of the TDD system.

[0183] When the second network device communicates with the second terminal device, the second network device can perform interference avoidance on the first channel, for example, the second network device performs digital precoding and zero forcing on the first terminal device according to the determined downlink channel information, or changes the analog beam weight value of the transmission, or does not transmit downlink data to perform interference avoidance on the first terminal device, thereby reducing the downlink interference on the first terminal device. The embodiments of the present application are not limited to the specific interference avoidance scheme.

[0184] The first communication system and the second communication system can also refer to different subsystems of the same system. For example, in the above method 500, in one possible implementation, the first communication system is an urban air traffic system (UAM system), and the second communication system is a ground communication system.

[0185] In one possible implementation, for the UAM system and the ground communication system using the same frequency band for communication, the ground access network device in the ground communication system can determine the downlink channel information to the air user in the UAM system, and perform interference avoidance based on the downlink channel information to reduce the impact on the downlink transmission of the air user. The scheme is described in detail below.

[0186] In the following embodiments, the interaction between the first access network device and the second access network device is exemplarily illustrated. The first access network device is an aerial access network device, serving aerial users. The first access network device can be replaced by a component (e.g., a chip or a chip system or a circuit) of the first access network device. The second access network device is a ground access network device, serving ground users. The second access network device can be replaced by a component (e.g., a chip or a chip system or a circuit) of the second access network device.

[0187] Referring to FIG. 8, as an example, FIG. 8 is a schematic flowchart of a communication method 800 provided by the embodiments of the present application. The method 800 shown in FIG. 8 can include the following steps.

[0188] 810, the first access network device sends indication information #1 to the second access network device. Correspondingly, the second access network device receives the indication information #1 from the first access network device.

[0189] The indication information #1 is used to indicate the configuration information of the at least one SRS configured by the first access network device to the aerial user.

[0190] The configuration information of the at least one SRS and the specific configuration method can refer to the description in the method 500, and will not be repeated here.

[0191] In a possible implementation, the indication information #1 includes the index of the at least one SRS.

[0192] In this scheme, the first access network device, the second access network device and the aerial user predefine the SRS set of the aerial user. The second access network device can determine the configuration information of the SRS of the aerial user based on the predefined SRS set and the indication information #1.

[0193] In another possible implementation, the indication information #1 includes the configuration information of the at least one SRS.

[0194] In an optional implementation, the resource of the at least one SRS used by the aerial user is orthogonal to the resource of the SRS used by the ground user, so as to reduce the interference between the SRS of the ground user and the SRS of the aerial user.

[0195] The understanding of the specific resource orthogonality can refer to the description in the method 500, and will not be repeated here.

[0196] 801, the first access network device sends indication information #2 to the second access network device. Correspondingly, the second access network device receives the indication information #2 from the first access network device.

[0197] The indication information #2 is used to indicate a transmission occasion of the first downlink transmission, which is a downlink transmission between the first access network device and the aerial user.

[0198] As an example, the indication information #2 can include at least one of time window length information of the first downlink transmission, periodicity information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission. For details, refer to the description in the method 500, which will not be repeated here.

[0199] 820, the aerial user sends the first SRS to the second access network device. Correspondingly, the second access network device receives the first SRS from the aerial user. The first SRS belongs to the at least one SRS.

[0200] Optionally, the method 800 can further include step 830.

[0201] 830, the second access network device communicates with the ground user based on the indication information #1 and the first SRS.

[0202] The second access network device can determine information of the channel #1 according to the indication information #1 and the first SRS, and can perform interference avoidance on the channel #1 when communicating with the ground user.

[0203] In a possible implementation, the second access network device can determine the original sequence of the SRS sent by the aerial device based on the indication information #1, and estimate the downlink channel (channel #1) between the second access network device and the aerial user based on the first SRS after channel estimation and the channel reciprocity of the time division duplex (TDD) system.

[0204] The embodiments of the present application are not limited to a specific interference avoidance scheme.

[0205] Based on the above technical solutions, for the UAM system and the ground communication system using the same frequency band for communication, the ground access network device in the ground communication system can determine the downlink channel information to the aerial user in the UAM system, so as to perform interference avoidance based on the downlink channel information and reduce the influence on the downlink transmission of the aerial user.

[0206] It should be understood that other possible implementations of the embodiments of the present application are similar to the above method 500 or 800, and refer to the description in the method 500 or 800, which will not be repeated here.

[0207] It should be understood that the size of the serial number of each process does not mean the order of execution, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0208] The above describes the scheme provided by the embodiments of the present application mainly from the perspective of interaction between network elements. It can be understood that each network element, such as a transmitting end device or a receiving end device, includes a hardware structure and / or a software module for performing each function in order to implement the above functions. Those skilled in the art should appreciate that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is implemented in the form of hardware or computer software driving hardware 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 the present application.

[0209] The embodiments of the present application can divide the function modules of the transmitting end device or the receiving end device according to the above method examples. For example, each function module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software function module. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division. Actual implementation can have another division manner. The following takes dividing each function module according to each function as an example for description.

[0210] The above describes the scheme provided by the embodiments of the present application mainly from the perspective of interaction between network elements. It can be understood that each network element, such as a transmitting end device or a receiving end device, includes a hardware structure and / or a software module for performing each function in order to implement the above functions. Those skilled in the art should appreciate that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is implemented in the form of hardware or computer software driving hardware 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 the present application.

[0211] FIG. 9 is a structural schematic diagram of a communication device provided by an embodiment of the present application.

[0212] The device 900 includes a transceiver unit 910 and a processing unit 920, wherein the transceiver unit 910 can be used to implement corresponding communication functions, and the processing unit 920 can be used for data processing.

[0213] Optionally, the transceiver unit 910 can also be referred to as a communication interface or a communication unit, including a sending unit and / or a receiving unit. The transceiver unit 910 can be a transceiver (including a transmitter and / or a receiver), an input / output interface (including an input and / or an output interface), a pin or a circuit, etc. The transceiver unit 910 can be used to perform the steps of sending and / or receiving in the above method embodiments.

[0214] Optionally, the processing unit 920 can be a processor (which can include one or more), a processing circuitry with processor functions, etc., which can be configured to perform the steps of the above-described method embodiments other than the sending and receiving.

[0215] Optionally, the apparatus 900 further includes a storage unit, which can be a memory, an internal storage unit (e.g., a register, a cache, etc.), an external storage unit (e.g., a read-only memory, a random access memory, etc.), etc. The storage unit is configured to store instructions, which the processing unit 920 executes to cause the communication apparatus to perform the above-described methods.

[0216] In one design, the apparatus 900 can be configured to perform the actions of the second network device in the above-described various method embodiments, e.g., the apparatus 900 can be configured to perform the actions of the second network device in the above-described method 500. In this case, the apparatus 900 can be a component of the second network device, the transceiver unit 910 can be configured to perform the transceiver-related operations of the second network device in the above-described method embodiments, and the processing unit 920 can be configured to perform the processing-related operations of the second network device in the above-described method embodiments.

[0217] For example, the transceiver unit 910 is configured to receive first indication information from a first network device, the first indication information being used to indicate configuration information of at least one SRS (Sounding Reference Signal), the configuration information of the at least one SRS being configured by the first network device to a first terminal device, the first network device being used to provide services to the first terminal device; and the transceiver unit 910 is further configured to receive a first SRS from the first terminal device, the first SRS belonging to the at least one SRS; wherein the first indication information and the first SRS are used by the second network device to determine information of a first channel, the information of the first channel being information of a downlink channel between the second network device and the first terminal device.

[0218] For another example, the transceiver unit 910 is further configured to receive second indication information, the second indication information being used to indicate a transmission occasion of a first downlink transmission, the first downlink transmission being a transmission between the first network device and the first terminal device.

[0219] For yet another example, the processing unit 920 is configured to determine a second SRS set, the second SRS set including resource mapping information of at least one SRS for use by the second terminal device, resources of SRSs in the second SRS set being orthogonal to resources of SRSs in the at least one SRS.

[0220] It should be understood that the transceiver unit 910 and the processing unit 920 can also perform other operations performed by the second network device in the above method 500, which will not be repeated here.

[0221] In one design, the apparatus 900 can be configured to perform the actions performed by the first network device in the various method embodiments above, e.g., the apparatus 900 can be configured to perform the actions performed by the first network device in the method 500 above. In this case, the apparatus 900 can be a component of the first network device, the transceiver unit 910 can be configured to perform the transceiver-related operations performed by the first network device in the various method embodiments above, and the processing unit 920 can be configured to perform the processing-related operations performed by the first network device in the various method embodiments above.

[0222] For example, the processing unit 920 can be configured to determine first indication information, the first indication information being used to indicate configuration information of at least one SRS configured to a first terminal device, the first network device being configured to provide service to the first terminal device; and the transceiver unit can be configured to send the first indication information to a second network device, the second network device being configured to provide service to a second terminal device.

[0223] For another example, the transceiver unit 910 can be further configured to send second indication information, the second indication information being used to indicate a transmission occasion of a first downlink transmission, the first downlink transmission being a transmission between the first network device and the first terminal device.

[0224] It should be understood that the transceiver unit 910 and the processing unit 920 can also perform other operations performed by the first network device in the above method 500, which will not be repeated here.

[0225] In one design, the apparatus 900 can be configured to perform the actions performed by the first terminal device in the various method embodiments above, e.g., the apparatus 900 can be configured to perform the actions performed by the first terminal device in the method 500 above. In this case, the apparatus 900 can be a component of the first terminal device, the transceiver unit 910 can be configured to perform the transceiver-related operations performed by the first terminal device in the various method embodiments above, and the processing unit 920 can be configured to perform the processing-related operations performed by the first terminal device in the various method embodiments above.

[0226] For example, the transceiver unit 910 can be configured to send a first SRS to a second network device, the first SRS belonging to at least one SRS, configuration information of the at least one SRS being configured to the first terminal device by the first network device; and wherein the first SRS and the configuration information of the at least one SRS are used by the second network device to determine information of a first channel, the information of the first channel being information of a downlink channel between the second network device and the first terminal device.

[0227] It should be understood that the transceiver unit 910 and the processing unit 920 can also perform other operations performed by the first terminal device in the method 500 described above, which will not be repeated here.

[0228] It should also be understood that the apparatus 900 here is embodied in the form of functional units. The term "unit" here can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor, or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combination of logical circuits, and / or other suitable components that support the described functions. In an optional example, those skilled in the art can understand that the apparatus 900 can be embodied as the network device in the above-described embodiments, and can be used to perform the respective processes and / or steps corresponding to the network device in the above-described method embodiments. To avoid repetition, details will not be repeated here.

[0229] The apparatus 900 of each of the above-described schemes has a function of implementing the respective steps performed by the terminal device in the above-described methods, or the apparatus 900 of each of the above-described schemes has a function of implementing the respective steps performed by the first network device or the second network device in the above-described methods. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions; for example, the transceiver unit can be replaced by a transceiver (for example, the transmitting unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units such as the processing unit can be replaced by a processor, which respectively performs the transceiving operations and related processing operations in the respective method embodiments.

[0230] In addition, the above-described transceiver unit 910 can also be a transceiver circuit (for example, which can include a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit.

[0231] It should be noted that the apparatus in FIG. 9 can be a network element or device in the foregoing embodiments, or can be a chip or chip system, such as a system on chip (SoC). The transceiver unit can be an input / output circuit, a communication interface; and the processing unit can be a processor or microprocessor integrated on the chip or an integrated circuit. Here, no limitation is made.

[0232] FIG. 10 is a schematic diagram of a communication architecture according to an embodiment of the present application. The communication apparatus 1000 shown in FIG. 10 includes a processor 1010 and a transceiver 1020. Optionally, the processor 1010 and the transceiver 1020 can be connected to each other through a bus 1030. The communication apparatus 1000 can be a terminal device or a network device.

[0233] Optionally, the communication apparatus 1000 can further include a memory 1040. The memory 1040 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read only memory (EPROM), or a compact disc read-only memory (CD-ROM). The memory 1040 is used to store relevant instructions and data.

[0234] The processor 1010 is coupled to the memory 1040, and used for executing instructions stored in the memory 1040, so as to control the transceiver 1020 to send and / or receive signals.

[0235] It should be understood that the processor 1010 and the memory 1040 described above can be combined into one processing device, and the processor 1010 is used to execute program codes stored in the memory 1040 to implement the above functions. In specific implementation, the memory 1040 can also be integrated in the processor 1010, or independent of the processor 1010. It should be understood that the processor 1010 can also correspond to each processing unit in the communication apparatus, and the transceiver 1020 can correspond to each receiving unit and transmitting unit in the communication apparatus.

[0236] It should also be understood that the transceiver 1020 can include a receiver (or receiver) and a transmitter (or transmitter). The transceiver can further include an antenna, and the number of antennas can be one or more. The transceiver can also be a communication interface or interface circuit.

[0237] Specifically, the communication apparatus 1000 can correspond to the first network device or the second network device in the method 500 according to the embodiments of the present application. The communication apparatus 1000 can include the units of the method executed by the first network device or the second network device in the method 500. It should be understood that the specific process of each unit executing the corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0238] Specifically, the communication apparatus 1000 can correspond to the first terminal device in the method 500 according to the embodiments of the present application. The communication apparatus 1000 can include the units of the method executed by the first terminal device in the method 500. It should be understood that the specific process of each unit executing the corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0239] When the communication device 1000 is a chip, the chip includes an interface unit and a processing unit. The interface unit can be an input / output circuit or a communication interface; and the processing unit can be a processor or a microprocessor integrated on the chip or an integrated circuit.

[0240] In the implementation process, the steps of the above method can be completed by the integrated logic circuit of hardware in the processor or the instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as hardware processor execution completion, or executed by the combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0241] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capability. In the implementation process, the steps of the above method embodiments can be completed by the integrated logic circuit of hardware in the processor or the instructions in the form of software. The above processor can be a general processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. The disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can be any conventional processor. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as hardware decoding processor execution completion, or executed by the combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method.

[0242] The present application also provides a computer readable medium having a computer program stored thereon, which, when executed by a computer, implements the functions of any of the above method embodiments.

[0243] The present application also provides a computer program product, which, when executed by a computer, implements the functions of any of the above method embodiments.

[0244] In the embodiments described above, all or some of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or some of the embodiments can be implemented by one or more computer programs, and can be stored in one or more computer readable storage media. When implemented by software, all or some of the embodiments can be implemented by one or more computer programs, and can be stored in one or more computer readable storage media. The computer readable storage media can be a magnetic disk, a floppy disk, a read-only memory (ROM), a random access memory (RAM), a flash memory, or any other suitable computer readable storage medium. The computer readable storage media can be fixed in place or can be removable and / or transportable. The computer readable storage media can be loaded into one or more computers, servers, or other programmable devices to cause the one or more computers, servers, or other programmable devices to execute the computer program instructions to implement all or some of the embodiments described above.

[0245] In the embodiments of the present application, the words "example" and "exemplary" are used to mean serving as an example, instance, or illustration. Any implementation described as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Rather, use of the terms is intended to present concepts in a concrete manner.

[0246] It is to be understood that the terminology "example" used throughout this specification intends that a particular feature, structure, or characteristic in some embodiments is included in at least one embodiment. Therefore, various embodiments as described throughout the specification are not necessarily all referring to the same embodiments. Furthermore, these particular features, structures, or characteristics can be incorporated in one or more embodiments in any suitable combination.

[0247] It should be understood that the magnitude of the serial number of each process described above does not mean the order of execution in various embodiments of the present application, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The names of all nodes and messages in the present application are only names set by the present application for convenience of description, and the names in the actual network can be different, and the present application should not be understood as limiting the names of various nodes and messages. On the contrary, any name with the same or similar function as the nodes or messages used in the present application is considered as a method or equivalent replacement of the present application, and is within the protection scope of the present application.

[0248] It should also be understood that in the present application, "when", "if" and "if" all refer to the corresponding processing of the UE or the base station under certain objective circumstances, not the time limit, and it is not required that the UE or the base station must have a judgment action when implementing, nor does it mean that there are other limitations.

[0249] In addition, the terms "system" and "network" are often used interchangeably in this paper. The term "and / or" in this paper is only a description of the association between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, B exists alone.

[0250] The term "at least one" or "at least one" in this paper means all or any combination of the listed items, for example, "at least one of A, B and C" can mean that A exists alone, B exists alone, C exists alone, A and B exist together, B and C exist together, A, B and C exist together. "At least one" in this paper means one or more. "Multiple" means two or more.

[0251] It should be understood that in various embodiments of the present application, the terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0252] It should be understood that in various embodiments of the present application, the first, second and various numerical numbers are only distinguished for convenience of description, and are not used to limit the scope of the embodiments of the present application. For example, to distinguish different information, etc.

[0253] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed 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 the present application.

[0254] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0255] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0256] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0257] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically independently, or two or more units can be integrated into one unit.

[0258] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0259] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: The method is applied to a second network device, and the second network device is configured to provide services for a second terminal device, and the method comprises the following steps of: receiving first indication information from a first network device, wherein the first indication information is used to indicate configuration information of at least one channel sounding reference signal (SRS), and the configuration information of the at least one SRS is configured by the first network device for a first terminal device, and the first network device is configured to provide services for the first terminal device; receiving a first SRS from the first terminal device, wherein the first SRS belongs to the at least one SRS; wherein the first indication information and the first SRS are used by the second network device to determine information of a first channel, and the information of the first channel is information of a downlink channel between the second network device and the first terminal device.

2. The method of claim 1, wherein, The method further comprises the following steps of: receiving second indication information, wherein the second indication information is used to indicate a transmission opportunity of a first downlink transmission, and the first downlink transmission is a transmission between the first network device and the first terminal device.

3. The method of claim 2, wherein, The second indication information comprises at least one of the following: time window length information of the first downlink transmission, periodicity information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission.

4. The method according to claim 2 or 3, characterized in that, The first indication information and the second indication information are the same indication information.

5. The method of any one of claims 1-4, wherein: the first indication information comprises an index of the at least one SRS; or the first indication information comprises configuration information of the at least one SRS.

6. The method of claim 5, wherein, The first indication information comprises an index of the at least one SRS, and the index of the at least one SRS corresponds to the configuration information of the at least one SRS.

7. The method of claim 5 or 6, wherein: the configuration information of the at least one SRS comprises at least one of the following: a time domain period, a time domain symbol, a frequency domain resource block number, a frequency domain comb interval, a group number, a group hop switch, a sequence number, a sequence hop switch, a code domain index, a comb number, a cyclic shift of the at least one SRS.

8. The method according to any one of claims 1-7, characterized in that, The method further comprises the following steps of: determining a second SRS set, wherein the second SRS set comprises resource mapping information of at least one SRS used by the second terminal device, and resources of SRSs in the second SRS set are orthogonal to resources of SRSs in the at least one SRS.

9. The method according to any one of claims 1-8, characterized in that, The first network device and the first terminal device belong to a first communication system, and the second network device and the second terminal device belong to a second communication system, and the first communication system and the second communication system use the same frequency band for communication.

10. A communication method characterized by comprising: The method is applied to a first network device, and the method comprises the following steps of: determining first indication information, wherein the first indication information is used to indicate configuration information of at least one channel sounding reference signal (SRS) configured for a first terminal device, and the first network device is configured to provide services for the first terminal device; sending the first indication information to a second network device, wherein the second network device is configured to provide services for a second terminal device.

11. The method of claim 10, wherein, The method further comprises the following steps of: transmit second indication information, the second indication information being used for indicating a transmission occasion of a first downlink transmission, the first downlink transmission being a transmission between the first network device and the first terminal device.

12. The method of claim 11, wherein, The second indication information comprises at least one of the following: time window length information of the first downlink transmission, periodicity information of the first downlink transmission, time point information of the first downlink transmission, or duration information of the first downlink transmission.

13. The method according to claim 11 or 12, characterized in that, The first indication information and the second indication information are the same indication information.

14. The method of any one of claims 10-13, wherein, The first indication information comprises an index of the at least one SRS; or The first indication information comprises configuration information of the at least one SRS.

15. The method of claim 14, wherein, The first indication information comprises an index of the at least one SRS, and the index of the at least one SRS corresponds to configuration information of the at least one SRS.

16. The method according to claim 14 or 15, characterized in that The configuration information of the at least one SRS comprises at least one of the following: time domain period, time domain symbol, frequency domain resource block number, frequency domain comb interval, group number, group hop switch, sequence number, sequence hop switch, code domain index, comb number, and cyclic shift of the at least one SRS.

17. The method according to any one of claims 10-16, characterized by, The first network device and the first terminal device belong to a first communication system, and the second network device and the second terminal device belong to a second communication system, wherein the first communication system and the second communication system use the same frequency band for communication.

18. The method of claim 17, wherein, The first communication system is an urban air traffic system, and the second communication system is a ground communication system.

19. A communications device, characterized by The apparatus comprises a module or unit for performing the method of any one of claims 1-18.

20. A communications device, characterized by The apparatus comprises a processor configured to perform the method of any one of claims 1-18.

21. A computer-readable storage medium, characterized in that, The computer program or instructions are stored on a computer readable storage medium, and when executed on a communication device, cause the communication device to perform the method of any one of claims 1-18.

22. A computer program product, characterised in that, The computer program product comprises computer program or instructions for performing the method of any one of claims 1-18. The computer program product comprises computer program or instructions for performing the method of any one of claims 1-18.

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