CN111757375A

CN111757375A - Wireless communication method, terminal equipment and access network equipment

Info

Publication number: CN111757375A
Application number: CN201910253415.2A
Authority: CN
Inventors: 王俊伟; 黎超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2020-10-09

Abstract

The application provides a method of wireless communication, wherein a first terminal device generates a first radio link monitoring reference signal (RLM-RS), and the first RLM-RS is used for monitoring a sidelink between the first terminal device and a second terminal device; and the first terminal equipment sends the first RLM-RS to second terminal equipment. The embodiment of the application provides an effective wireless link monitoring mode for data transmission of sidelines under the conditions of unmanned driving, remote operation, smart grid, transportation safety, smart city, smart home and the like, and can be applied to vehicle networking, such as V2X, LTE-V, V2V and the like.

Description

Wireless communication method, terminal equipment and access network equipment

Technical Field

The present application relates to the field of communications, and in particular, to a method and an apparatus for wireless communication.

Background

With the rapid development of wireless communication technology, the fifth Generation (5th Generation, 5G) wireless communication technology has been a hot spot in the industry. The 5G will support diverse application requirements including access capability supporting higher rate experience and larger bandwidth, lower latency and highly reliable information interaction, and access and management of larger-scale and low-cost machine type communication devices, etc. In addition, 5G can support various vertical industry application scenes such as vehicle networking, emergency communication, industrial internet and the like. In the face of the performance requirements and application scenarios of 5G, the 5G network needs to be closer to the specific requirements of users, and the customization capability needs to be further improved.

In order to better support the transmission of upper layer service data, enable the dense wireless networks to cooperate more efficiently, and reduce the mutual interference of signals, it is necessary to evaluate and monitor the transmission quality of the wireless link, so as to ensure that the data transmission is performed on a high-quality data link.

In a scenario where device to device (D2D) and the like may perform direct communication between devices, a link for transmitting data between devices is called a sidelink. For data transmission of the sidelink, there is no effective Radio Link Monitoring (RLM) method.

Disclosure of Invention

The embodiment of the application provides a wireless communication method, terminal equipment and access network equipment, and provides an effective wireless link monitoring method, so that service data can be transmitted on a high-quality data link.

In a first aspect, a method of wireless communication is provided, including: a first terminal device generates a first radio side link monitoring reference signal (RLM-RS), wherein the first side link RLM-RS is used for monitoring a side link between the first terminal device and a second terminal device; and the first terminal equipment sends the first RLM-RS to second terminal equipment.

The first terminal equipment sends a radio link monitoring reference signal RLM-RS to the second terminal equipment, so that the monitoring of a sidelink between the first terminal equipment and the second terminal equipment can be realized.

With reference to the first aspect, in a possible implementation manner, before the first terminal device sends the first RLM-RS to the second terminal device, the method includes: the first terminal device receives resource indication information from a first access network device, wherein the resource indication information is used for indicating first time-frequency resources, and the first time-frequency resources are used for sending the first RLM-RS.

The access network equipment configures the resource for bearing the RLM-RS, so that the possibility of interference between signals can be reduced, the influence of the RLM process on data transmission is reduced, and the reasonable utilization of the resource is realized.

With reference to the first aspect, in a possible implementation manner, before the first terminal device sends the first RLM-RS to the second terminal device, the method includes: the first terminal device determines a first time-frequency resource from a resource set, wherein the first time-frequency resource is used for sending the first RLM-RS, and the resources in the resource set are used for transmitting the RLM-RS in a side uplink.

With reference to the first aspect, in a possible implementation manner, the method further includes: the first terminal equipment receives indication information of the resource set from the first access network equipment; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

The access network equipment configures the resource set for bearing the RLM-RS, so that the possibility of interference between signals can be reduced, the influence of the RLM process on data transmission is reduced, and the reasonable utilization of resources is realized.

With reference to the first aspect, in a possible implementation manner, before the first terminal device sends the first RLM-RS to the second terminal device, the method includes: the first terminal equipment sends zero power RLM-RS resource configuration information to the second terminal equipment, wherein the zero power RLM-RS resource configuration information is used for indicating resources used for zero power RLM-RS, the resources of the zero power RLM-RS belong to the resource set, and the zero power RLM-RS is used for interference measurement; the first terminal equipment receives second resource indication information from the second terminal equipment, wherein the second resource indication information is used for indicating a first time-frequency resource with smaller interference, and the smaller interference comprises minimum interference and/or interference smaller than a preset value.

With reference to the first aspect, in a possible implementation manner, before the first terminal device sends the first RLM-RS to the second terminal device, the method includes: the first terminal equipment receives first activation information from first access network equipment or the second terminal equipment, wherein the first activation information is used for indicating the first terminal equipment to send RLM-RS.

The first terminal equipment starts to send the first RLM-RS after receiving the first activation information, so that the frequency of sending RLM-RS signals by the first terminal equipment is reduced, resources occupied by the RLM-RS signals are reduced, interference among the signals can be reduced, and the data transmission efficiency is improved.

With reference to the first aspect, in a possible implementation manner, after the first terminal device sends the first RLM-RS to the second terminal device, the method includes: the first terminal device receives first deactivation information from a first access network device or the second terminal device, wherein the first activation information is used for indicating the first terminal device to stop sending RLM-RS.

With reference to the first aspect, in a possible implementation manner, before the first terminal device sends the first RLM-RS to the second terminal device, the method includes: and the first terminal equipment sends second activation information to the second terminal equipment, wherein the second activation information is used for indicating the second terminal equipment to measure the RLM-RS.

And the second terminal equipment starts to measure the first RLM-RS after receiving the second activation information, so that the power consumption of the second terminal equipment for RLM can be reduced, and the waste of resources is reduced.

With reference to the first aspect, in a possible implementation manner, after the first terminal device sends the first RLM-RS to the second terminal device, the method includes: and the first terminal equipment sends second deactivation information to the second terminal equipment, wherein the second deactivation information is used for indicating the second terminal equipment to stop the measurement of the RLM-RS.

With reference to the first aspect, in a possible implementation manner, before the first terminal device sends the first RLM-RS to the first terminal device on the first RLM-RS resource, the method includes: the first terminal device receives sending indication information from a first access network device, wherein the sending indication information is used for indicating that the first terminal device sends the first RLM-RS to the second terminal device in a radio link monitoring process.

The first access network equipment indicates the sending end of the first RLM-RS, so that the complexity of the process caused by coordination among terminal equipment can be reduced. Meanwhile, effective monitoring can be guaranteed according to the capability of the terminal equipment and the condition of the sidelink.

With reference to the first aspect, in a possible implementation manner, the sending, by the first terminal device, the first RLM-RS to the second terminal device includes: and the first terminal equipment repeatedly sends the first RLM-RS to second terminal equipment in a time domain.

By the first terminal device repeatedly transmitting the first RLM-RS to the second terminal device in the time domain, the amplitude of the received signal or the high and low level thresholds of the analog-to-digital conversion can be adjusted. The same signal is repeatedly sent, so that the method is simple and easy to realize.

With reference to the first aspect, in a possible implementation manner, an interval of the first RLM-RS that is repeatedly transmitted is 0 symbol.

With reference to the first aspect, in a possible implementation manner, the first RLM-RS includes at least one of the following signals: the channel state information reference signal CSI-RS of the side link, the synchronizing signal of the side link and the demodulation reference signal DMRS of the side link.

In the case that the system resources are tight, for example, when the channel occupancy rate available for the RLM is high, the first access network device may use at least one of the CSI-RS resource, the synchronization signal resource, and the DMRS resource in the first RLM-RS resource set as the first RLM-RS resource. The occupation of system resources can be reduced.

In a second aspect, a method of wireless communication is provided, comprising: a second terminal device receives a first radio link monitoring reference signal (RLM-RS) from a first terminal device, wherein the first RLM-RS is used for monitoring a side link between the first terminal device and the second terminal device; and the second terminal equipment measures the first RLM-RS.

With reference to the second aspect, in a possible implementation manner, before the second terminal device receives the first RLM-RS from the first terminal device, the method includes: the second terminal device receives resource indication information from a first access network device or the first terminal device, where the resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

With reference to the second aspect, in a possible implementation manner, before the second terminal device receives the first RLM-RS from the first terminal device, the method includes: the first terminal equipment receives indication information of the resource set from the first access network equipment; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

With reference to the second aspect, in a possible implementation manner, before the second terminal device receives the first RLM-RS from the first terminal device, the method includes: the second terminal device receiving zero power RLM-RS resource configuration information from the first terminal device, the zero power RLM-RS resource configuration information being used for indicating resources for reference signals of zero power, the resources of the zero power RLM-RS belonging to the resource set, the zero power RLM-RS being used for interference measurement; the second terminal equipment measures the interference of the resource of the reference signal with zero power; and at least one resource with small interference is the first RLM-RS resource, and the small interference comprises minimum interference and/or interference smaller than a preset value.

With reference to the second aspect, in a possible implementation manner, before the second terminal device receives the first RLM-RS from the first terminal device, the method includes: the second terminal equipment receives first activation information from first access network equipment or the first terminal equipment, and the first activation information is used for indicating the second terminal equipment to measure the RLM-RS.

With reference to the second aspect, in a possible implementation manner, the method further includes: the second terminal equipment receives first deactivation information from first access network equipment or the first terminal equipment, wherein the first activation information is used for indicating the second terminal equipment to stop the measurement of RLM-RS.

With reference to the second aspect, in a possible implementation manner, before the second terminal device receives the first RLM-RS from the first terminal device, the method includes: and the second terminal equipment sends second activation information to the first terminal equipment, wherein the second activation information is used for indicating the first terminal equipment to send the RLM-RS.

With reference to the second aspect, in a possible implementation manner, the method further includes: and the second terminal equipment sends second deactivation information to the first terminal equipment, wherein the second activation information is used for indicating the first terminal equipment to stop sending the RLM-RS.

With reference to the second aspect, in a possible implementation manner, before the second terminal device receives the first RLM-RS from the first terminal device, the method includes: and the second terminal equipment receives transmission indication information from first access network equipment, wherein the transmission indication information is used for indicating that the first terminal equipment transmits the first RLM-RS to the second terminal equipment in a radio link monitoring process.

With reference to the second aspect, in a possible implementation manner, the receiving, by the second terminal device, the first RLM-RS from the first terminal device includes: the second terminal device receives the first RLM-RS repeatedly transmitted in the time domain from the first terminal device.

With reference to the second aspect, in a possible implementation manner, the first RLM-RS includes at least one of the following signals: the channel state information reference signal CSI-RS of the side link, the synchronizing signal of the side link and the demodulation reference signal DMRS of the side link.

In a third aspect, a method of wireless communication is provided, including: first access network equipment generates first indication information, and the first access network equipment sends the first indication information to first terminal equipment; the first indication information comprises at least one of the following information: first resource indication information, configured to indicate a first time-frequency resource, where the first time-frequency resource is used to transmit a first RLM-RS, and the first RLM-RS is used for sidelink monitoring between the first terminal device and the second terminal device; resource set indication information for indicating a resource set, wherein resources in the resource set are used for transmitting RLM-RS, and the first time-frequency resource belongs to the resource set; first activation information for instructing the first terminal device to transmit an RLM-RS; first deactivation information for instructing the first terminal device to stop transmission of the RLM-RS; and sending indication information for indicating that the first terminal equipment sends the first RLM-RS to the second terminal equipment in a radio link monitoring process.

With reference to the third aspect, in a possible implementation manner, the first indication information includes the resource set indication information and zero power position indication information, where the zero power position indication information is used to indicate a position of a zero-power reference signal in each resource of the resource set, and the zero-power reference signal is used for measuring interference of the resource; and the first access network equipment receives second resource indication information from the second terminal equipment, and the second resource indication information is used for indicating at least one resource with smaller interference as the first time-frequency resource.

With reference to the third aspect, in a possible implementation manner, the first indication information includes the first resource indication information, and the resource indication information includes an identifier of the first time-frequency resource.

With reference to the third aspect, in a possible implementation manner, the first access network device sends the second indication information to the second terminal device; the first indication information comprises at least one of the following information: the first resource indication information, the resource set indication information, the first activation information, the first deactivation information, and the transmission indication information.

With reference to the third aspect, in a possible implementation manner, the first RLM-RS includes at least one of the following signals: the channel state information comprises a channel state information reference signal CSI-RS, a synchronous signal block SSB and a demodulation reference signal DMRS.

In a fourth aspect, a terminal device is provided, including: a generating module, configured to generate a first radio link monitoring reference signal RLM-RS, where the first RLM-RS is used for monitoring a sidelink between the terminal device and the second terminal device; and the transceiver module is used for transmitting the first RLM-RS to second terminal equipment.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to receive first resource indication information from a first access network device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

With reference to the fourth aspect, in a possible implementation manner, the first resource indication information includes an identifier of the first time-frequency resource.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to determine a first time-frequency resource from a set of resources, where the first time-frequency resource is used to transmit the first RLM-RS, and resources in the set of resources are used to transmit the RLM-RS in the sidelink.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to receive, from the first access network device, indication information of the resource set; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to send zero power RLM-RS resource configuration information to the second terminal device, where the zero power RLM-RS resource configuration information is used to indicate resources for a zero power RLM-RS, the resources of the zero power RLM-RS belong to the resource set, and the zero power RLM-RS is used for interference measurement; the transceiver module is further configured to receive second resource indication information from the second terminal device, where the second resource indication information is used to indicate at least one resource with less interference as the first time-frequency resource, and the interference is less including minimum interference and/or interference smaller than a preset value.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to receive first activation information from the first access network device or the second terminal device, where the first activation information is used to instruct the terminal device to transmit the RLM-RS.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to receive first deactivation information from the first access network device or the second terminal device, where the first activation information is used to instruct the terminal device to stop sending the RLM-RS.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to send second activation information to the second terminal device, where the second activation information is used to instruct the second terminal device to measure the RLM-RS.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to send second deactivation information to the second terminal device, where the second deactivation information is used to instruct the second terminal device to stop measuring the RLM-RS.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module is further configured to receive, from the first access network device, transmission indication information, where the transmission indication information is used to indicate that the terminal device transmits the first RLM-RS to the second terminal device in a radio link monitoring process.

With reference to the fourth aspect, in a possible implementation manner, the transceiver module 1920 is further configured to repeatedly transmit the first RLM-RS to the second terminal device in the time domain.

With reference to the fourth aspect, in a possible implementation manner, an interval of the first RLM-RS that is repeatedly transmitted is 0 symbol.

With reference to the fourth aspect, in a possible implementation manner, the first RLM-RS includes at least one of the following signals: the channel state information reference signal CSI-RS of the side link, the synchronizing signal of the side link and the demodulation reference signal DMRS of the side link.

In a fifth aspect, a terminal device is provided, which includes: a transceiver module, configured to receive a first radio link monitoring reference signal RLM-RS sent by a first terminal device, where the first RLM-RS is used for monitoring a sidelink between the first terminal device and the terminal device; a measurement module to measure the first RLM-RS.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is further configured to receive first resource indication information from a first access network device or the first terminal device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

With reference to the fifth aspect, in a possible implementation manner, the first resource indication information includes an identifier of the first time-frequency resource.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is configured to receive, from the first access network device, indication information of the resource set; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is further configured to receive, from the first terminal device, zero power RLM-RS resource configuration information, where the zero power RLM-RS resource configuration information is used to indicate resources used for a reference signal with zero power, and the resources of the zero power RLM-RS belong to the resource set, and the zero power RLM-RS is used for measuring interference; the terminal equipment is used for measuring the interference of the resource of the reference signal with zero power; the measuring module is further configured to measure interference of resources of the zero-power reference signal; the transceiver module is further configured to send second resource indication information to the first terminal device or the first access network device, where the second resource indication information is used to indicate that at least one resource with smaller interference is the first time-frequency resource, and the smaller interference includes minimum interference and/or interference smaller than a preset value.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is further configured to receive first activation information from a first access network device or the first terminal device, where the first activation information is used to instruct the terminal device to perform measurement on the RLM-RS.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is further configured to receive first deactivation information from a first access network device or the first terminal device, where the first activation information is used to instruct the terminal device to stop measuring RLM-RS.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is configured to send second activation information to the first terminal device, where the second activation information is used to instruct the first terminal device to start sending the RLM-RS.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is further configured to send second deactivation information to the first terminal device, where the second activation information is used to instruct the first terminal device to stop sending the RLM-RS.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is configured to receive transmission indication information sent by a first access network device, where the transmission indication information is used to indicate that the first terminal device sends the first RLM-RS to the terminal device in a radio link monitoring process.

With reference to the fifth aspect, in a possible implementation manner, the transceiver module is configured to repeatedly transmit the first RLM-RS to the terminal device in a time domain.

With reference to the fifth aspect, in a possible implementation manner, a time interval of the first RLM-RS that is repeatedly transmitted is 0 symbol.

With reference to the fifth aspect, in a possible implementation manner, the first RLM-RS includes at least one of the following signals: the channel state information reference signal CSI-RS of the side link, the synchronizing signal of the side link and the demodulation reference signal DMRS of the side link.

In a sixth aspect, an access network device is provided, which includes: the generating module is used for generating first indication information; the transceiver module is used for sending the first indication information to first terminal equipment; the first indication information comprises at least one of the following information: first resource indication information, configured to indicate a first time-frequency resource, where the first time-frequency resource is used to transmit a first RLM-RS, and the first RLM-RS is used for sidelink monitoring between the first terminal device and the second terminal device; first resource set indication information for indicating a resource set, wherein resources in the resource set are used for transmitting RLM-RS, and the first time-frequency resources belong to the resource set; first activation information for instructing the first terminal device to transmit an RLM-RS; first deactivation information for instructing the first terminal device to stop transmission of the RLM-RS; and sending indication information for indicating that the first terminal equipment sends the first RLM-RS to the second terminal equipment in a radio link monitoring process.

In combination with the sixth aspect, the first indication information includes the resource set indication information and zero power position indication information, the zero power position indication information is used to indicate a position of a zero power reference signal in each resource of the resource set, and the zero power reference signal is used for measurement of interference of the resource; the transceiver module is further configured to receive second resource indication information from the second terminal device, where the second resource indication information is used to indicate that at least one resource with less interference is the first time-frequency resource.

With reference to the sixth aspect, in a possible implementation manner, the first RLM-RS includes at least one of the following signals: the channel state information comprises a channel state information reference signal CSI-RS, a synchronous signal block SSB and a demodulation reference signal DMRS.

In a seventh aspect, a communication apparatus is provided, including: at least one processor and a communication interface for the communication device to interact with other communication devices, which when executed in the at least one processor causes the communication device to perform the above method.

In an eighth aspect, there is provided a computer program storage medium having program instructions which, when executed, cause the method above to be performed.

In a ninth aspect, a chip is provided, the chip system comprising at least one processor, which when program instructions are executed in the at least one processor causes the method in the above to be performed.

Drawings

Fig. 1 is a schematic diagram of a scenario of an inter-device communication method.

Fig. 2 is a schematic diagram of a scenario for radio link monitoring of the downlink.

Fig. 3 is a schematic diagram of a scenario for monitoring a radio link of a sidelink according to an embodiment of the present application.

Fig. 4 is a schematic flow chart of a method of wireless communication according to an embodiment of the present application.

Fig. 5 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 6 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 7 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 8 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 9 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 10 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 11 is a schematic flowchart of a method for determining an RLM status by an access network device according to an embodiment of the present application.

Fig. 12 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 13 is a schematic diagram of a scenario of sidelink wireless communication.

Fig. 14 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 15 is a diagram illustrating a format of an RLM-RS signal according to an embodiment of the present application.

Fig. 16 is a diagram illustrating a format of an RLM-RS signal according to another embodiment of the present application.

Fig. 17 is a diagram illustrating a format of an RLM-RS signal according to another embodiment of the present application.

Fig. 18 is a schematic flow chart of a method of wireless communication according to another embodiment of the present application.

Fig. 19 is a schematic structural diagram of a terminal device according to an embodiment of the present application.

Fig. 20 is a schematic structural diagram of a terminal device according to another embodiment of the present application.

Fig. 21 is a schematic structural diagram of an access network device according to an embodiment of the present application.

Fig. 22 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) or New Radio (NR) system, and the like.

Fig. 1 is a schematic diagram of a scenario of an inter-device communication scheme. In the scenario shown in fig. 1, a link in which the terminal device 121 transmits data to the access network device 110 is referred to as an uplink (uplink), and a link in which the terminal device 121 receives data transmitted by the access network device 110 is referred to as a downlink (downlink). A link for transmitting data between the terminal device 121 and the terminal device 122 is called a sidelink (sidelink). The sidelink is generally used in a scenario where vehicle-to-other devices (V2X), or device-to-device (D2D), and the like can perform direct communication between devices. V2X communication can be seen as a special case of D2D communication.

A New Radio (NR) access technology is a mainstream wireless communication technology at present, and can support V2X communication with lower delay and higher reliability according to the service characteristics of V2X and new service requirements. V2X is the basic and key technology for realizing intelligent automobile, automatic driving and intelligent transportation system. V2X may include Vehicle to internet (V2N), Vehicle to Vehicle (V2V), Vehicle to infrastructure (V2I), Vehicle to pedestrian (V2P), and the like. The V2N communication is the most widely used form of car networking at present, and its main function is to make the vehicle connect to the cloud server through the mobile network, and use the navigation, entertainment, anti-theft application functions provided by the cloud server. The V2V communication can be used for information interaction and reminding among vehicles, and the most typical application is for an inter-vehicle anti-collision safety system. Through the V2I communication, the vehicle can communicate with roads and other infrastructures, such as traffic lights, roadblocks and the like, and acquire road management information such as signal timing of the traffic lights and the like. The V2P communication may be used for safety warnings of pedestrians or non-motor vehicles on the road.

The terminal device in this embodiment may refer to a User Equipment (UE), an access terminal, a subscriber unit, a Subscriber Station (SS), a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a Customer Premises Equipment (CPE), a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment.

The access network device may be configured to access a terminal to a Radio Access Network (RAN). Thus, an access network device may sometimes also be referred to as an access device or an access network node. It will be appreciated that in systems employing different radio access technologies, the names of devices that function as base stations may differ. For convenience of description, in the embodiments of the present application, apparatuses that provide a terminal with a wireless communication access function are collectively referred to as an access network device. The access network device may be, for example, an evolved node B (eNB) in Long Term Evolution (LTE), or a next generation base station (gNB) in a fifth generation (5G) mobile communication system. The access network device may be a macro base station or a micro base station. The access network device may also be a road side device or a certain terminal with a wireless access function. In this embodiment of the present application, devices capable of implementing functions related to the access network device side in this embodiment of the present application are collectively referred to as access network devices.

In the embodiment of the present application, the terminal device or the access network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a Central Processing Unit (CPU), a Memory Management Unit (MMU), and a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (processes), such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a windows operating system. The application layer comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided in the embodiment of the present application, as long as the program recorded with the code of the method provided in the embodiment of the present application can be executed to perform communication according to the method provided in the embodiment of the present application, for example, the execution main body of the method provided in the embodiment of the present application may be a terminal device or an access network device, or a functional module capable of calling the program and executing the program in the terminal device or the access network device.

The transmission modes between the terminal devices include a broadcast mode, a multicast mode, and a unicast mode. The broadcast mode is a mode in which a transmitting end transmits data in a broadcast mode, and all receiving ends can analyze Sidelink Control Information (SCI) and traffic channel information (SSCH). In the sidelink, the way to guarantee that all terminals can analyze SCI is: the control information data is not scrambled or a scrambling code known to all terminals is used. The multicast mode is similar to the broadcast mode, the data transmission is carried out by adopting the broadcast mode, and all receiving ends can analyze SCI and SSCH. The terminal determines whether to parse the SSCH according to an Identifier (ID) in the SCI. Unicast mode is when one terminal sends data to another terminal that the other terminal does not need or is not able to parse.

Fig. 2 is a schematic diagram of a scenario for radio link monitoring of the downlink. Radio Link Monitoring (RLM) refers to the continuous tracking of the quality of the downlink by the terminal device in the connected state.

The terminal device 221, the terminal device 222, the terminal device 223, and the terminal device 224 respectively monitor a radio link monitoring reference signal (RLM-RS) transmitted by the access network device 210.

The terminal equipment enters a cell covered by the service access network equipment of the terminal equipment and is in a connected state, and the service access network equipment of the terminal equipment allocates a group of reference signal resources for RLM for the terminal equipment. It is also understood that the serving access network device is equipped with an RLM-RS for the terminal device. The resource in the embodiment of the present application may refer to a time-frequency resource.

The access network device 210 sends an RLM-RS signal, and 4 terminal devices in the cell can receive the RLM-RS signal, and monitor the link quality through measurement.

The access network device 210 periodically transmits the RLM-RS in a broadcast or multicast manner. Each of the terminal apparatus 221, the terminal apparatus 222, the terminal apparatus 223, and the terminal apparatus 224 measures the RLM-RS, and estimates a block error rate (BLER) of the downlink.

The radio link monitoring will be described by taking downlink monitoring by the terminal 221 as an example. The terminal device 221 may obtain a Received Signal Strength (RSSI), a signal-to-noise ratio (SNR), a signal-to-interference plus noise ratio (SINR), a first layer reference signal received power (L1-RSRP), and the like by receiving the RLM-RS and performing measurement in a physical layer. The terminal device may estimate the downlink BLER based on RSSI, SNR, SINR.

The physical layer of the terminal device 221 measures the RLM-RS, and transmits a synchronization instruction or an out-of-synchronization instruction to a Medium Access Control (MAC) layer according to the measurement result.

If the measurement result of the physical layer of the terminal device 221 for the RLM-RS satisfies a first preset condition, for example, the BLERs corresponding to the measurement result of the RLM-RS are all higher than a first preset value (for example, the BLER is higher than 10%), the physical layer of the terminal device 221 sends an out of synchronization indication to the MAC layer. If the measurement result of the physical layer of the terminal device 221 to the RLM-RS does not satisfy the second preset condition, for example, the BLER corresponding to the measurement result of the RLM-RS is lower than the second preset value (if the BLER is lower than 2%), the physical layer of the terminal device 221 sends a synchronization (synchronization) indication to the MAC layer.

If the MAC layer of the terminal device 221 continuously receives N1 out-of-sync messages, a timer is started. If the terminal device 221 fails to continuously receive N2 synchronization indications before the timer expires, the downlink is deemed to be in an out-of-synchronization state. The downlink is considered to be back in synchronization if the MAC is able to continuously receive N2 synchronization indications before the timer expires.

For wireless link monitoring, the wireless link may be in a synchronous state or an out-of-synchronization state by determining that the wireless link is in a synchronous state or an out-of-synchronization state. According to the above-mentioned results of monitoring the radio link, when the downlink is in an out-of-synchronization state, the terminal device 221 may perform cell reselection and random access.

The above-described method is a method of performing RLM for downlink. However, there is no effective RLM scheme for data transmission of the sidelink. In order to solve the problem of how to perform RLM on the sidelink, the present application proposes a method of wireless communication.

Fig. 3 is a schematic diagram of a scenario for monitoring a radio link of a sidelink according to an embodiment of the present disclosure.

A first sidelink is established between terminal device 221 and terminal device 224. A second sidelink is established between terminal device 222 and terminal device 223.

Terminal device 221 may transmit RLM-RS1 to terminal device 224. Terminal device 224 receives RLM-RS1 and performs monitoring of the first sidelink.

Terminal device 222 may send RLM-RS 2 to terminal device 223. The terminal device 223 receives the RLM-RS 2 and performs monitoring of the second sidelink.

The terminal device may be, for example, a wireless terminal in self driving (self driving), a wireless terminal in remote surgery (remote surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or the like.

Monitoring of the sidelink refers to a sending end and a receiving end of the sidelink service, sending the RLM-RS through one end, receiving and measuring the RLM-RS through the other end, measuring link quality and evaluating channel quality (for example, measuring a reference signal, calculating a first layer RSRP (layer 1RSRP, L1-RSRP), or RSRQ, or a signal-to-noise ratio), calculating a block error rate of a specific channel (for example, a control channel or a data channel) according to the measurement, making a judgment result of link synchronization or link desynchronization according to the block rate, and reporting the judgment result to a protocol high layer. The L1-RSRP may also be referred to as a physical layer RSRP.

Fig. 4 is a schematic flow chart of a method for wireless communication according to an embodiment of the present application.

In step S401, the first terminal device generates a first RLM-RS.

In step S402, the first terminal device transmits the first RLM-RS to the second terminal device.

In the time domain, the first terminal device may repeatedly transmit the first RLM-RS to the second terminal device. It should be understood that the first RLM-RS is the same over two time units that are equal in the time domain. The two repeated first RLM-RS may be transmitted continuously in time, and there may also be a time interval between two repeated first RLM-RS. The first RLM-RS may occupy two time-domain adjacent symbols. Symbol the symbol may also be a sub-symbol. That is, the interval symbol length between the repeated RLM-RSs is 0. In the time domain, the first preceding RLM-RS may be used for automatic gain control adjustment, and the first following RLM-RS may be used for RLM. For example, two first RLM-RSs may be respectively carried in two adjacent symbols in the time domain, where the symbol carrying the first RLM-RS serves as a signal for automatic gain control adjustment, and the second RLM-RS serves as a signal for side link quality measurement. And as a receiving end of the first RLM-RS, the second terminal equipment receives the two first RLM-RSs in different time domains, performs automatic gain control adjustment according to the previous first RLM-RS, and measures the subsequent first RLM-RS to perform RLM.

The signals received by the terminal equipment through the wireless link are analog signals. In order to determine the measurement results of SNR, SINR, RSRP, RSRQ, noise power, etc. of the received reference signal, the terminal device needs to convert the received analog signal into a digital signal in order to determine the noise in the signal. Converting an analog signal to a digital signal is also referred to as analog-to-digital conversion. In the process of analog-to-digital conversion of signals, the amplitude of the analog signals is too large or too small, so that the converted digital signals are wrong, and correct measurement results cannot be obtained. By sending the same signal in two equal time units, the terminal device can adjust the amplitude of the signal in the next time unit according to the signal in the previous time unit in terms of time, or adjust the high-low level threshold for performing analog-to-digital conversion on the signal in the next time unit, and can realize correct analog-to-digital conversion on the signal in the next time unit, that is, realize AGC.

In step S403, the second terminal device measures the first RLM-RS.

Optionally, the first terminal device may repeatedly transmit the first RLM-RS to the second terminal device in the time domain, so as to adjust the amplitude of the received signal or the high and low level thresholds of the analog-to-digital conversion. This process may also be referred to as Automatic Gain Control (AGC). The same signal is repeatedly sent, so that the method is simple and easy to realize.

Optionally, before step S402, the first terminal device and the second terminal device may determine a first RLM-RS resource for carrying the first RLM-RS. The RLM-RS resources may be time-frequency resources. The first terminal device and the second terminal device may determine an identity of the first RLM-RS resource, thereby determining the first RLM-RS resource.

For example, the first terminal device or the second terminal device may determine the first RLM-RS resource according to the pre-configuration information. The pre-configured information may be a set of resources. A collection of resources may also be referred to as a resource pool or group of resources. A plurality of RLM-RS resources may be included in the set of resources. Each RLM-RS resource may include a slot period, a period offset, a position of a symbol in a slot, frequency domain information, and the like.

For example, the first terminal device and/or the second terminal device may receive resource indication information sent by the first access network device, where the resource indication information is used to indicate the first RLM-RS resource. For example, the resource indication information may include an identification of the first RLM-RS resource. The identification may be an index number. The first access network device may indicate the first RLM-RS resources by sending an identification of the first RLM-RS resources so that the first access network device may determine the first RLM-RS resource time and/or frequency domain locations. The first terminal device receives the resource indication information sent by the first access network device, which may also be understood as the first terminal device receiving the resource indication information from the first access network device.

For example, the first terminal device and/or the second terminal device may receive resource set indication information sent by the first access network device, and determine one or more RLM-RS resources in a resource set indicated by the resource set indication information as the first RLM-RS resources. The first terminal device may select one or more RLM-RS resources from the set of resources as the first RLM-RS resource.

Further, one or more RLM-RS resources with the best performance in the resource set may be determined to be the first RLM-RS resource through a zero-power or non-zero-power reference signal. For example, one or more RLM-RS resources of the set of resources with less interference may be determined to be a first RLM-RS resource. For a reference signal with zero power, the interference is small may be that the measured interference signal is small, for example, smaller than a preset value. The reference signal interference for non-zero power may be that the measured interference signal is small, or that one or more of RSSI, SNR, SINR is large, for example, larger than a preset value.

The first terminal device may send zero power RLM-RS resource configuration information to the second terminal device, the zero power RLM-RS resource configuration information indicating resources for a zero power RLM-RS, the resources of the zero power RLM-RS belonging to the set of resources, the zero power RLM-RS being used for interference measurement; the first terminal equipment receives second resource indication information from the second terminal equipment, wherein the second resource indication information is used for indicating a first time-frequency resource with smaller interference, and the smaller interference comprises minimum interference and/or interference smaller than a preset value.

The access network equipment configures the resource or resource set for bearing the RLM-RS, so that the possibility of interference between signals can be reduced, the influence of the RLM process on data transmission is reduced, and the reasonable utilization of the resource is realized.

Alternatively, before step S402, the first terminal device and the second terminal device may determine the RLM activation state or the RLM deactivation state.

Illustratively, the RLM activation state or RLM deactivation state may be determined according to one or more of channel occupancy information, channel quality information, and traffic class information of a sidelink service of the sidelink between the first terminal device and the second terminal device.

For example, the first terminal device and/or the second terminal device may receive activation indication information sent by the first access network device to determine the activation status. The first terminal device and/or the second terminal device may receive the deactivation indication information sent by the first access network device to determine the deactivation status.

By determining the RLM activation state or the RLM deactivation state, the power consumption of the second terminal device for RLM can be reduced, and the waste of resources is reduced. After the deactivation, the first terminal equipment does not send the RLM-RS signal, so that resources occupied by the RLM-RS signal are reduced, interference among signals can be reduced, and the data transmission efficiency is improved.

And in the activated state, the first terminal equipment and the second terminal equipment perform RLM. The first terminal device may transmit the RLM-RS to the second terminal device, e.g., the first terminal device may transmit the first RLM-RS to the second terminal device. The first terminal device receives the activation indication information and may start transmitting the first RLM-RS to the second terminal device.

And in the activated state, the second terminal equipment can receive the RLM-RS transmitted by the first terminal equipment. In the active state, the second terminal device may perform measurement on the RLM-RS. The RLM-RS can be, for example, a first RLM-RS. The second terminal device receives the activation indication information and may start measuring the RLM-RS.

And in the deactivated state, the first terminal equipment and the second terminal equipment stop RLM.

In the deactivated state, the first terminal device may stop transmitting the RLM-RS to the second terminal device.

Optionally, the first terminal device may reserve resources for transmitting RLM-RS, i.e. the RLM-RS resource configuration remains in effect, e.g. the first RLM-RS resources remain in effect. When the terminal equipment is in the activated state again, the first terminal equipment transmits the RLM-RS on the configured RLM-RS resource, for example, the first terminal equipment transmits the first RLM-RS on the first RLM-RS resource.

Optionally, the first terminal device may not reserve the resource for transmitting the RLM-RS, and the RLM-RS resource configuration fails. When the first terminal device is in the active state again, the first terminal device re-determines the resources for transmitting the RLM-RS.

In the deactivated state, the first terminal device may transmit the RLM-RS to the second terminal device, and the second terminal device may stop the measurement of the RLM-RS.

Optionally, the first terminal device and the second terminal device may determine a transmitting end of the first RLM-RS.

For example, the first terminal device and the second terminal device may determine, according to the preconfigured information, a transmitting end of the sidelink service between the first terminal device and the second terminal device as a transmitting end of the first RLM-RS, or determine a receiving end of the sidelink service as a transmitting end of the first RLM-RS.

Illustratively, the first terminal device and/or the second terminal device may receive transmission indication information sent by the first access network device, where the transmission indication information is used to indicate that the first terminal device sends the first RLM-RS to the second terminal device in a radio link monitoring process. Thus, it is determined that the first RLM-RS is transmitted by the first terminal device, which is the transmitting end of the first RLM-RS. It is to be understood that the first RLM-RS is measured by the second terminal device, and the first terminal device is a receiving end of the first RLM-RS. The transmission indication information may also be referred to as transmission-end indication information.

The first access network device determines that the first terminal device is the sending end of the first RLM-RS, so that the complexity in the process caused by coordination among the terminal devices can be reduced. Meanwhile, effective monitoring can be guaranteed according to the capability of the terminal equipment and the condition of the sidelink.

It should be noted that at least two of the resource indication information, the resource set indication information, the transmission indication information, and the activation indication information sent by the first access network device may be carried in the same or different messages. Wherein the resource indication information and the resource set indication information may be carried in different messages.

The resource indication information, the resource set indication information, the sending indication information and the activation indication information are sent by the first access network device in sequence without limitation.

For example, the first access network device may send the activation indication information and the sending indication information to the first terminal device simultaneously. The activation indication information indicates an RLM activation status. And the sending indication information indicates that the first terminal equipment is the sending end of the first RLM-RS. And after receiving the two pieces of information, the first terminal equipment sends the first RLM-RS to the second terminal equipment.

The first access network device may also send the sending indication information to the first terminal device first. And the first terminal equipment receives the transmission indication information and determines that the first RLM-RS is transmitted by the first terminal equipment. And the first access network equipment sends activation indication information to the first terminal equipment. And after receiving the activation indication information, the first terminal equipment sends the first RLM-RS to the second terminal equipment.

The first access network device may also send activation indication information to the first terminal device first. After receiving the activation indication information, the first terminal device and/or the second terminal device starts to send the RLM-RS as a sending end of the RLM-RS, that is, starts to monitor the sidelink. The first access network device sends the originating indication information to the first terminal device. After the first terminal device receives the origination indication information, the first terminal device may serve as a sender of the first RLM-RS to send the first RLM-RS, and the second terminal device measures the first RLM-RS. The origination indication information may also be referred to as transmission indication information or sender indication information.

The following describes, in detail, methods for determining a first RLM-RS resource, determining an RLM activation state/an RLM deactivation state, determining a transmitting end of an RLM-RS signal, and implementing automatic gain control, respectively, with reference to specific embodiments.

The method for sending information to the terminal device by the access network device is not limited in the embodiments of the present application, and the information may be sent by a broadcast, multicast or unicast manner, and the access network device may send information to the terminal device by Radio Resource Control (RRC), media access control (MAC-CE) message, physical layer control message, and the like.

One or more of a channel state information reference signal (CSI-RS), a synchronization signal, and a demodulation reference signal (DMRS) may be used as the RLM-RS signal. That is, the set of RLM-RS resources may include one or more of the following resources: the system comprises RLM-RS special resources, CSI-RS resources, synchronous signal resources and DMRS resources. The synchronization signal resource may be, for example, a Synchronization Signal Block (SSB) or the like. Reference signals of other sidelink can also be used as RLM-RS signals. The embodiments of the present application do not limit this.

In the case that the system resources are relatively tight, for example, when the channel occupancy rate available for the RLM or the overall sidelink occupancy rate is relatively high, the first access network device may use at least one of the CSI-RS resource, the synchronization signal resource, and the DMRS resource in the first RLM-RS resource set as the first RLM-RS resource. The resources are not specially set for RLM measurement, and the terminal equipment uses the reference information for measurement, so that the occupation of system resources can be reduced, and if the system indicates that the DMRS of the PSCCH (side link control channel) is used as an RLM measurement signal, the receiving end measures the DMRS of the PSCCH and evaluates the channel.

The resource for carrying the RLM-RS signal may be represented by an RLM-RS resource Identification (ID). For example, the RLM-RS resource ID may include a CSI-RS resource ID, an SSB ID, a DMRS resource ID, and the like.

For the sidelink between the first terminal device and the second terminal device, the DMRS used for RLM may use DMRSs of all physical channels as RLM-RS signals, or may use DMRSs of one or some physical channels as RLM-RS signals, for example, only DMRSs of a Physical Sidelink Control Channel (PSCCH) are used, or DMRSs of a PSCCH, a physical sidelink shared channel (PSCCH), and a Physical Sidelink Feedback Channel (PSFCH) are used as RLM-RS signals.

When the access network device configures resources for RLM, it may be configured whether to monitor the sidelink with the DMRS as an RLM-RS signal, and may be configured which channel or channels of the DMRS are used as the RLM-RS signal for monitoring the sidelink. For example, the access network device may use 1 bit in the message sent to the first terminal device as whether to RLM with DMRS. If "0" indicates that DMRS is used for estimation, and "1" indicates that DMRS is not used for estimation.

A 1 bit (bit) may also be included in the SCI to indicate whether to use DMRS for RLM.

When the DMRS is used as the RLM-RS signal for RLM, the terminal device serving as the RLM-RS signal receiving end may identify the missed detection of the DMRS. For example, the DMRS of the PSCCH is used as the RLM-RS signal, and when the terminal device at the receiving end of the RLM-RS signal recognizes that one missed detection occurs to the PSCCH, 1 or more out-of-synchronization is recorded (the specific value may be configured by the access network device, or default to 1).

The DMRS of the physical channel is used as the RLM-RS signal, so that the RLM-RS resource is saved, and the related configuration process is reduced.

Fig. 5 is a method of wireless communication according to an embodiment of the present application.

In order to monitor the quality of the sidelink between the first terminal device and the second terminal device, RLM is performed, and the second terminal device may perform measurements on the first RLM-RS. For example, the second terminal device may measure SNR, SINR, noise power, Reference Signal Receiving Power (RSRP), Reference Signal Receiving Quality (RSRQ), etc. of the first RLM-RS to obtain the measurement result. The measurement result may be one or more of SNR, SINR, RSRP, RSRQ, and noise power, and may also be a deblocking rate calculated according to one or more of SNR, SINR, RSRP, RSRQ, and noise power. The process of calculating the resulting rate of the missing block may also be referred to as estimating the rate of the missing block.

And when the measurement result meets a first preset condition, the lower layer of the second terminal equipment sends an out-of-step indication to the upper layer. And when the measurement result does not meet a second preset condition, the lower layer of the second terminal equipment sends a synchronization instruction to the upper layer. The lower layer of the second terminal device may be, for example, the physical layer. The lower layer of the second terminal device may be, for example, the MAC layer. The lower layer of the second terminal device may perform measurements on the first RLM-RS. The first preset condition may be, for example, that SNR, SINR, noise power, or block error rate is greater than a first preset value. The second preset condition may be, for example, that SNR, SINR, noise power, or block error rate is greater than a second preset value. The first preset value may be greater than or equal to the second preset value.

The higher layer of the second terminal device may start a timer after N1 out-of-sync indications are received consecutively, the timer being timed to T2. The N1 out-of-sync indications may be received during the T1 time period. Before the timer is overtime, if the higher layer of the second terminal device continuously receives N2 synchronous indications, the side link quality between the first terminal device and the second terminal device is considered to meet the requirement, and the first terminal device and the second terminal device are in a synchronous state. The higher layer of the second terminal device may stop the timer. The second terminal device continues to monitor the sidelink between the first terminal device and the second terminal device. N1 and N2 are positive integers of 1 or more.

Before the timer is overtime, if the upper layer of the second terminal device does not continuously receive N2 synchronous indications, the first terminal device and the second terminal device are in an out-of-synchronization state, and the side link quality between the first terminal device and the second terminal device is considered not to meet the requirement. Optionally, the first terminal device and the second terminal device are in an out-of-synchronization state, and the second terminal device may send an out-of-synchronization state report to the first terminal device, where the out-of-synchronization state report is used to instruct the first terminal device to ensure data transmission between the first terminal device and the second terminal device by increasing signal transmission power or establishing a data forwarding path.

Fig. 6 is a schematic flow chart of a method for wireless communication according to an embodiment of the present application.

The first RLM-RS resource may carry the first RLM-RS. The first RLM-RS may be used for monitoring of a sidelink between the first terminal device and the second terminal device.

The first terminal device may determine the first RLM-RS resource according to the preconfigured information if the first terminal device is located outside the coverage of the first access network device. The first terminal device may transmit the first RLM-RS to the second terminal device on the first RLM-RS resource.

Exemplarily, the first terminal device determines the first RLM-RS resource. The resource pool may be configured on the first terminal device. That is, the first terminal device may be configured with a set of resources. The resources in the set of resources may be used for transmission of the RLM-RS. The first terminal device may also determine that one or more RLM-RS resources may be used as the first RLM-RS resource in the resource set by means of listening (sensing). The first terminal device may send resource indication information to the second terminal device, for indicating the first RLM-RS resource carrying the first RLM-RS.

A manner in which the first terminal device determines the first RLM-RS resource by listening (sensing) is explained.

In one possible implementation, the terminal device performing RLM, for example, the terminal device transmitting RLM-RS and/or the terminal device receiving RLM-RS, may periodically transmit RLM-RS indication information. The RLM-RS indication information is used for indicating the RLM-RS resource information occupied by the terminal equipment for RLM. The RLM-RS indication information may be, for example, an ID number in the resource set, scrambling code information, and the like.

And the first terminal equipment receives the RLM-RS indication information and takes one or more RLM-RS resources which are not occupied in the resource set as the first RLM-RS resources. The energy on the resources of the set of resources that are not occupied can be measured, i.e. the interference on these resources is measured. One or more RLM-RS resources with the smallest energy on the resources that are not occupied in the resource set, or one or more RLM-RS resources with energy less than a preset value, or one or more RLM-RS resources with energy less than the energy on the occupied resources may be used as the first RLM-RS resource.

Optionally, to guarantee listening to a situation that the RLM-RS may be sent on a resource in the resource set, a duration of the listening may be greater than or equal to a maximum period of the RLM-RS resource configured in the resource set.

In another possible implementation, the terminal device measures the energy on each resource according to a pre-configured set of resources. And one or more RLM-RS resources with energy lower than a preset value are used as the first RLM-RS. The terminal device may use one or more RLM-RS resources, for which the first determined energy is lower than a preset value, as the first RLM-RS.

If the first terminal device is located within the coverage of the first access network device, the first terminal device may determine the first RLM-RS resource according to the preconfigured information, and may also perform steps S601-S602.

As shown in fig. 2, for the RLM of the downlink, in one cell, the terminal device 221, the terminal device 222, the terminal device 223, and the terminal device 224 respectively measure the RLM-RS transmitted by the access network device 210. That is, in one cell, the number of RLM-RSs transmitted for RLM is small, and the occupied resources are small. However, in the case of RLM for the sidelink as shown in fig. 3, there may be multiple terminal devices in one cell, i.e., there may be multiple sidelinks. As shown in fig. 3, there are a sidelink between terminal device 221 and terminal device 224, and a sidelink between terminal device 222 and terminal device 223. Monitoring the two sidelink requires occupying different resources. By using the resource corresponding to RLM-RS1, the sidelink between terminal device 221 and terminal device 224 may be monitored; the sidelink between terminal device 221 and terminal device 224 may be monitored using the resources corresponding to RLM-RS 2. To reduce interference between RLM-RS1 and RLM-RS 2, RLM-RS1 and RLM-RS 2 need to be orthogonal to each other. The mutual orthogonality of the RLM-RS1 and the RLM-RS 2 can be realized by adopting a frequency division, time division or code division mode. In a cell covered by the access network equipment, there may be multiple sidelink. The terminal device transmits a large number of RLM-RSs for performing RLM for a plurality of sidelink. The terminal equipment determines the resource carrying the RLM-RS according to the pre-configured information, which may cause interference between signals, so that the monitoring result of the RLM is inconsistent with the actual situation.

In step S601, the first terminal device receives first resource indication information sent by the first access network device, and is used to indicate that the first RLM-RS is carried on the first RLM-RS resource.

Optionally, before step S601, the first access network device may determine the first RLM-RS resource set. A collection of resources may also be referred to as a resource pool or group of resources. The first set of RLM-RS resources includes one or more RLM-RS resources that may be used for RLMs for the sidelink.

Optionally, one or more of a channel state information reference signal (CSI-RS), a synchronization signal in a Synchronization Signal Block (SSB), and a demodulation reference signal (DMRS) may also be used as the first RLM-RS. That is, the first set of RLM-RS resources may include one or more of the following resources: the system comprises RLM-RS special resources, CSI-RS resources, synchronous signal resources and DMRS resources. The reference signals of other sidelink can also be used as the first RLM-RS. The embodiments of the present application do not limit this. The RLM-RS dedicated resource signal is transmitted on the RLM-RS dedicated resource.

In the case that system resources are tight, for example, when the channel occupancy rate available for RLM is high, the first RLM-RS resource set configured by the first access network device may include at least one of a resource of CSI-RS, a resource of synchronization signal, and a resource of DMRS. One or more of the CSI-RS resource, the synchronization signal resource and the DMRS resource are used as the first RLM-RS resource, so that the occupation of the system resource by RLM can be reduced.

Prior to step S601, the first access network device may send resource set indication information to the first terminal device. The resource set indication information is used to indicate the first set of RLM-RS resources.

The first access network device may use one or more RLM-RS resources of the resources corresponding to the first RLM-RS resource set as the first RLM-RS resources. The first access network device may randomly or according to a certain rule use one or more RLM-RS resources in the resources corresponding to the first RLM-RS resource set as the first RLM-RS resources. The following description will be made in conjunction with specific embodiments, which will not be described in detail herein.

Before step S601, the first terminal device or the second terminal device may send resource request information to the first access network device. The resource request information is for requesting the first resource indication information.

Optionally, after step S601, the first terminal device may send second resource indication information to the second terminal device, where the second resource indication information is used to indicate the first RLM-RS resource.

Optionally, before, after, or simultaneously with step S601, the first access network device may send third resource indication information to the second terminal device, where the third resource indication information is used to indicate the first RLM-RS resource.

In step S602, the first terminal device transmits the first RLM-RS to the second terminal device on the first RLM-RS resource.

For example, the first access network device may also send the first resource indication information to the second terminal device, and the second terminal device sends the third resource indication information to the first terminal device. The first resource indication information and the third resource indication information are used for indicating the first RLM-RS resource.

Before step S602, the first terminal device and the second terminal device receive the resource indication information, and determine the first RLM-RS resource.

Through steps S601-S602, the access network device configures the resource carrying the RLM-RS, so that the possibility of interference between signals can be reduced, the influence on service transmission is reduced, and errors in the monitoring result of the RLM are reduced. The first access network equipment can allocate resources in a cell covered by the first access network equipment, reduce interference among different signals, reduce the influence of an RLM process on data transmission, and realize reasonable utilization of the resources.

Fig. 7 is a schematic flow chart of a method for wireless communication according to an embodiment of the present application.

The first RLM-RS resource may carry the first RLM-RS. The first RLM-RS may be used for sidelink monitoring between the first terminal device and the second terminal device.

If the first terminal device is located within the coverage of the first access network device, the first terminal device may determine the first RLM-RS resource according to the preconfigured information, and may also perform steps S701 to S702. The first terminal device and the second terminal device may determine the first RLM-RS resource before step S702.

As shown in fig. 2, for the RLM of the downlink, in one cell, the terminal device 221, the terminal device 222, the terminal device 223, and the terminal device 224 respectively measure the RLM-RS transmitted by the access network device 210. That is, in one cell, the number of RLM-RSs transmitted for RLM is small, and the occupied resources are small. However, in the case of performing RLM on the sidelink as shown in fig. 3, since there may be multiple terminal devices in one cell, that is, there may be multiple sidelinks, the terminal device transmits a large number of RLM-RSs for performing RLM on the multiple sidelinks. The terminal equipment determines the resource carrying the RLM-RS according to the pre-configured information, which may cause interference between signals, so that the monitoring result of the RLM is inconsistent with the actual situation.

Prior to step S701, the first access network device may determine a first set of RLM-RS resources. A collection of resources may also be referred to as a resource pool or group of resources. The first set of RLM-RS resources may include one or more RLM-RS resources that may be used for RLMs for the sidelink. The resources in the set of resources may be used for transmission of the RLM-RS.

Optionally, one or more of CSI-RS of the sidelink, synchronization signal of the sidelink, and DMRS of the sidelink may also be used as the first RLM-RS. That is, the first set of RLM-RS resources may include one or more of the following resources: the system comprises RLM-RS special resources, CSI-RS resources, resources for bearing synchronous signals and DMRS resources. The resource carrying the synchronization signal may be, for example, an SSB, and a reference signal of other sidelink may also be used as the first RLM-RS. The embodiments of the present application do not limit this.

Prior to step S701, the first terminal device or the second terminal device may request information from the first access network device for the set of resources.

In step S701, the first terminal device receives first resource set indication information sent by the first access network device. The first resource set indication information may be used to indicate a first set of RLM-RS resources. The first set of RLM-RS resources may include one or more RLM-RS resources that may be used for sidelink monitoring between the first terminal device and the second terminal device. The first set of RLM-RS resources may include first RLM-RS resources. In other words, the first RLM-RS resource belongs to a first set of RLM-RS resources.

The first terminal device may treat one or more RLM-RS resources of the first set of RLM-RS resources as the first RLM-RS resources. The first terminal device may use one or more RLM-RS resources in the first set of RLM-RS resources as the first RLM-RS resources at random or according to a certain rule. The embodiment of the present application does not limit this.

Optionally, the first access network device may send the second resource set indication information to the second terminal device. The set of resources indicated by the second set of resources indication information may be the same as or different from the set of resources indicated by the first set of resources indication information. The resources indicated by the second set of resources indication information may include more or less resources. The second terminal device may use one or more RLM-RS resources in the first set of RLM-RS resources as the first RLM-RS resources at random or according to a certain rule. For example, the second terminal device may pre-measure the resources indicated by the first RLM-RS resource set, and use one or more RLM-RS resources whose interference meets a preset condition as the first RLM-RS resources. The embodiment of the present application does not limit this. The following detailed description is to be read in connection with specific embodiments, which are not intended to be exhaustive.

Optionally, before step S702, the first terminal device may send resource indication information to the second terminal device, where the resource indication information is used to indicate that the first RLM-RS is carried on the first RLM-RS resource.

In step S702, the first terminal device transmits the first RLM-RS to the second terminal device on the first RLM-RS resource.

Through steps S701 to S702, the access network device configures the resource set carrying the RLM-RS, so that the possibility of inter-signal interference can be reduced, and errors in the monitoring result of the RLM can be reduced or even avoided. The first access network equipment can allocate resources in a cell covered by the first access network equipment, reduce interference among different signals, reduce the influence of an RLM process on data transmission, and realize reasonable utilization of the resources.

Fig. 8 is a schematic flow chart of a method for wireless communication according to an embodiment of the present application.

The terminal equipment has limited processing capacity, and the terminal equipment performs RLM on the sidelink and occupies the resources of the terminal equipment.

As shown in fig. 2, for the RLM of the downlink, in one cell, the terminal device 221, the terminal device 222, the terminal device 223, and the terminal device 224 respectively measure the RLM-RS transmitted by the access network device 210. That is, in one cell, the number of RLM-RSs transmitted for RLM is small, and the occupied resources are small. However, in the case of RLM for the sidelink as shown in fig. 3, there may be multiple terminal devices in one cell, i.e., there may be multiple sidelinks. That is, the terminal device has a large number of RLM-RSs to transmit for RLM for a plurality of sidelink, and therefore occupies a large amount of resources. Excessive resource occupation by the RLM-RS may result in a reduction in the resources available for data transmission, thereby affecting the sidelink transmission efficiency.

The first RLM-RS may be used for sidelink monitoring between the first terminal device and the second terminal device. The first terminal device may perform steps S801-S803, regardless of whether the first terminal device is located outside the coverage of the first access network device or within the coverage of the first access network device.

For the sidelink between the first terminal device and the second terminal device, the first terminal device may be a sending end or a receiving end of the sidelink service.

In step S801, the first terminal device transmits activation instruction information to the second terminal device. The activation indication information may be used to indicate to the second terminal device to start measuring said first RLM-RS.

The first terminal device may send activation indication information to the second terminal device when a sidelink service between the first terminal device and the second terminal device meets a first preset condition.

The first terminal device may determine the RLM activation status when a sidelink service between the first terminal device and the second terminal device satisfies a first preset condition.

And receiving the activation indication information sent by the first terminal equipment, and the second terminal equipment can determine the RLM activation state.

There may be multiple sidelink services between the first terminal device and the second terminal device, and the first terminal device may send the activation indication information to the second terminal device when at least one of the sidelink services satisfies a first preset condition. For example, when at least one of all the sidelink services satisfies a first preset condition, or when at least one of all the sidelink services of the first terminal device as the transmitting end satisfies the first preset condition, the first terminal device sends activation indication information to the second terminal device.

The first preset condition may include a condition related to service level information of the service, a condition related to channel occupancy information of a sidelink transmitting the service, and a condition related to channel quality information of a sidelink transmitting the service.

The channel occupancy information of the sidelink may include occupancy rate, congestion rate, and the like of the channel, for example, occupancy rate, congestion rate, and the like of all channel resources configured by the access network device for the first terminal device, or occupancy rate, congestion rate, and the like of all channel resources configured by the access network device. The first preset condition may be, for example, that the occupancy or the congestion rate is lower than a preset value. The occupancy or congestion rate is high, and RLM may have a large influence on the transmission of traffic. Therefore, RLM may not be performed when the channel occupancy is high.

The traffic class information may include a traffic priority class, a transmission quality requirement class, and the like. The service priority includes a proximity services packet priority (PPPP) and the like. The transmission quality requirement may also be referred to as quality of service (QoS) information of the service, etc. The QoS information may include a 5G QoS identifier (5G QoS identification, 5QI), a V2X QoS identifier (V2X QoS identification, VQI), a QoS Flow Identifier (QFI), a QoS Class Identifier (QCI), and the like. The first preset condition may be, for example, that the PPPP of the sidelink traffic is greater than or equal to a first preset value. In the case of low requirement of the service on the channel quality, RLM may not be performed.

The channel quality information of the sidelink may include RSRP, RSRQ, path loss, etc. In the process of performing sidelink service transmission, a reference signal is sent on a sidelink, and a receiving end of the sidelink service can measure the reference signal to obtain information such as RSRP, RSRQ, path loss and the like. The receiving end of the sidelink service can measure the sidelink service to obtain the path loss. The path loss may also be referred to as path loss or propagation loss. When RSRP and RSRQ are large or path loss is low, the channel quality of the sidelink is good, the communication quality between the terminal devices can be guaranteed, and RLM may not be performed.

Prior to step S802, the first terminal device may determine a first RLM-RS resource. That is, if the first terminal device is in the coverage area, before step S802, or further, before step S801, the first terminal device may receive the first resource set indication information and/or the first resource indication information sent by the first access network device. The first resource indication information is shown in fig. 6. The first resource set indication information is described with reference to fig. 7.

Prior to step S802, the second terminal device may determine the first RLM-RS resource. That is, if the second terminal device is in the coverage area, before step S802, or further before step S801, the second terminal device may receive the third resource indication information sent by the first access network device or the second resource indication information sent by the first terminal device. The second resource indication information and the third resource indication information refer to the description of fig. 6.

In step S802, the first terminal device transmits a first RLM-RS to the second terminal device.

The first terminal device may transmit the first RLM-RS to the second terminal device after step S801 or simultaneously with step S801.

The second terminal device may perform measurement on the first RLM-RS after receiving the activation indication information.

In one possible implementation, before step S801, the first terminal device does not transmit a signal for RLM to the second terminal device, e.g., does not transmit the first RLM-RS. In step S801, the first terminal device starts to transmit the first RLM-RS to the second terminal device.

In another possible implementation, before step S801, the first terminal device transmits a signal for RLM to the second terminal device, but the second terminal device may not perform measurement. For example, before step S801, the first terminal device transmits the first RLM-RS to the second terminal device, and the second terminal device does not perform measurement for RLM on the first RLM-RS. After receiving the transmission activation indication information, the second terminal device may perform measurement for RLM on the first RLM-RS.

In step S803, the first terminal device transmits the deactivation instruction information to the second terminal device. The deactivation indication information may be used to instruct the second terminal device to stop the measurement of the first RLM-RS.

The first terminal device may send the deactivation indication information to the second terminal device when the sidelink service does not satisfy the second preset condition.

When the sidelink service between the first terminal device and the second terminal device does not satisfy the second preset condition, the first terminal device may determine the RLM deactivation state.

And receiving the deactivation indication information sent by the first terminal equipment, and the second terminal equipment can determine the RLM deactivation state.

There may be multiple sidelink services between the first terminal device and the second terminal device, and the first terminal device may send the activation indication information to the second terminal device when at least one of the sidelink services does not satisfy the second preset condition. For example, when all the sidelink services do not satisfy the second preset condition, or all the sidelink services taking the first terminal device or the second terminal device as the transmitting end do not satisfy the second preset condition, the first terminal device sends the activation indication information to the second terminal device.

The second preset condition may include a condition related to service level information of the service, a condition related to channel occupancy information of a sidelink that also transmits the service, and a condition related to channel quality information of a sidelink that transmits the service. The second preset condition may be the same as or different from the first preset condition.

The second terminal device may not measure the first RLM-RS after receiving the transmission activation indication information.

In one possible implementation, after step S803, the first terminal device does not send any more signals for RLM to the second terminal device, e.g., does not send the first RLM-RS.

In some embodiments, the first terminal device may no longer reserve resources for carrying the first RLM-RS. And when the side link service meets the first preset condition, re-determining the resource for bearing the RLM-RS signal.

In other embodiments, the first terminal device may reserve resources for carrying the first RLM-RS. And when the first preset condition is met, sending an RLM-RS signal on the resource corresponding to the first RLM-RS.

In another possible implementation, after step S803, the first terminal device sends a signal for RLM to the second terminal device, but the second terminal device may not perform measurement. For example, after step S803, the first terminal device transmits the first RLM-RS to the second terminal device, and the second terminal device does not perform measurement for RLM on the first RLM-RS.

The monitoring capabilities of the terminal device are limited. Through steps S801 to S803, power consumption of the second terminal device for RLM is reduced, and waste of resources is reduced. After the deactivation, the first terminal equipment does not send the RLM-RS signal, so that resources occupied by the RLM-RS signal are reduced, interference among signals can be reduced, and the data transmission efficiency is improved.

Fig. 9 is a schematic flow chart of a method for wireless communication according to an embodiment of the present application.

For the sidelink between the first terminal device and the second terminal device, the first terminal device may be a sending end or a receiving end of the sidelink service. The first RLM-RS may be used for sidelink monitoring between the first terminal device and the second terminal device.

When the sidelink service between the first terminal device and the first terminal device meets a first preset condition, the second terminal device can perform RLM measurement on the first RLM-RS; when the sidelink service between the first terminal device and the first terminal device does not meet the second preset condition, the second terminal device may not perform measurement for RLM on the first RLM-RS.

Or, when the sidelink service between the first terminal device and the first terminal device meets the first preset condition, the second terminal device may perform step 901; when the sidelink service between the first terminal device and the first terminal device does not satisfy the second preset condition, the second terminal device may perform step 903.

Steps S901-S903 may be performed no matter the first terminal device and/or the second terminal device is located outside the coverage of the first access network device or within the coverage of the first access network device.

In step S901, the second terminal device transmits activation instruction information to the first terminal device. The activation indication information may be used to indicate to the first terminal device to start transmitting the first RLM-RS.

The second terminal device may send activation indication information to the first terminal device when a sidelink service between the first terminal device and the second terminal device meets a first preset condition.

The second terminal device may determine the RLM activation status when the sidelink service between the first terminal device and the second terminal device satisfies a first preset condition.

And receiving the activation indication information sent by the second terminal equipment, and the first terminal equipment can determine the RLM activation state.

There may be multiple sidelink services between the first terminal device and the second terminal device, and the second terminal device may send the activation indication information to the first terminal device when at least one of the sidelink services satisfies a first preset condition. For example, when at least one of all the sidelink services satisfies a first preset condition, or when at least one of all the sidelink services of the second terminal device as the transmitting end satisfies the first preset condition, the second terminal device sends activation indication information to the first terminal device.

The traffic information may include a traffic priority level, a transmission quality requirement level, etc. The service priority includes a proximity services packet priority (PPPP) and the like. The transmission quality requirement may also be referred to as quality of service (QoS) information of the service, etc. The QoS information may include a 5G QoS identifier (5G QoS identification, 5QI), a V2X QoS identifier (V2X QoS identification, VQI), a QoS Flow Identifier (QFI), a QoS Class Identifier (QCI), and the like. The first preset condition may be, for example, that the PPPP of the sidelink traffic is greater than or equal to a first preset value. In the case of low requirement of the service on the channel quality, RLM may not be performed.

Prior to step S902, the first terminal device may determine the first RLM-RS resource. That is, if the first terminal device is in the coverage area, before step S902, or further before step S901, the first terminal device may receive the first resource set indication information and/or the first resource indication information sent by the first access network device. The first resource indication information is shown in fig. 6. The first resource set indication information is described with reference to fig. 7.

Prior to step S902, the second terminal device may determine the first RLM-RS resource. That is, if the second terminal device is in the coverage area, before step S902, or further before step S901, the second terminal device may receive the third resource indication information sent by the first access network device or the second resource indication information sent by the first terminal device. The second resource indication information and the third resource indication information refer to the description of fig. 6.

In step S902, the first terminal device transmits the first RLM-RS to the second terminal device.

The first terminal device may transmit the first RLM-RS to the second terminal device after step S901. Alternatively, the first terminal device may start to transmit the first RLM-RS to the second terminal device after step S901.

The second terminal device may perform measurement on the first RLM-RS after step S901.

Prior to step S901, the first terminal device does not transmit a signal for RLM to the second terminal device, e.g., does not transmit the first RLM-RS. In step S901, the first terminal device starts to transmit the first RLM-RS to the second terminal device.

In step S903, the first terminal device sends deactivation instruction information to the second terminal device. The deactivation indication information may be used to instruct the first terminal device to stop sending the first RLM-RS to the second terminal device. After step S903, the first terminal device does not send the first RLM-RS to the second terminal device any more.

The second terminal device may send the deactivation indication information to the first terminal device when the sidelink service does not satisfy the second preset condition.

And receiving the deactivation indication information sent by the second terminal equipment, and the first terminal equipment can determine the RLM deactivation state.

There may be multiple sidelink services between the first terminal device and the second terminal device, and the second terminal device may send the activation indication information to the first terminal device when at least one of the sidelink services does not satisfy the second preset condition. For example, when all the sidelink services do not satisfy the second preset condition, or all the sidelink services taking the first terminal device or the second terminal device as the transmitting end do not satisfy the second preset condition, the second terminal device sends the activation indication information to the first terminal device.

After step S903, the first terminal device may no longer transmit the first RLM-RS to the second terminal device.

The monitoring capabilities of the terminal device are limited. Through steps S901 to S903, power consumption of the second terminal device for RLM is reduced, and waste of resources is reduced. After the deactivation, the first terminal equipment does not send the RLM-RS signal, so that resources occupied by the RLM-RS signal are reduced, interference among signals can be reduced, and the data transmission efficiency is improved.

Fig. 10 is a schematic flow chart of a wireless communication method according to an embodiment of the present application.

For the sidelink between the first terminal device and the second terminal device, the first terminal device may be a sending end or a receiving end of the sidelink service. The first RLM-RS may be used for sidelink monitoring between the first terminal device and the second terminal device. The first RLM-RS may be used for sidelink monitoring between the first terminal device and the second terminal device.

In step S1001, the first access network device sends first activation instruction information to the first terminal device.

The first access network device may send the first activation instruction information to the first terminal device when a sidelink service between the first terminal device and the second terminal device meets a first preset condition.

Receiving the first activation indication information sent by the first access network device, the first terminal device may determine the RLM activation status.

There may be multiple sidelink services between the first terminal device and the second terminal device, and the first access network device may send the first activation indication information to the first terminal device when at least one of the sidelink services satisfies a first preset condition. For example, when all sidelink services satisfy a first preset condition, or all sidelink services with the first terminal device as a transmitting end satisfy the first preset condition, the first access network device sends the first activation indication information to the first terminal device.

The first preset condition may include a condition related to service level information of the service, a condition related to channel occupancy information of a sidelink that also transmits the service, and a condition related to channel quality information of a sidelink that transmits the service.

The traffic class information may include a traffic priority class, a transmission quality requirement class, and the like. The service priority includes a proximity services packet priority (PPPP) and the like. The transmission quality requirement may also be referred to as quality of service (QoS) information of the service, etc. The QoS information may include a 5G QoS identifier (5G QoS identification, 5QI), a V2X QoS identifier (V2X QoS identification, VQI), a QoS Flow Identifier (QFI), a QoS Class Identifier (QCI), and the like. The first preset condition may be, for example, that the channel occupancy is greater than or equal to a first preset value, or that the PPPP of the sidelink traffic is greater than or equal to a first preset value. In the case of low requirement of the service on the channel quality, RLM may not be performed.

Before step S1002, further, before step S1001, the first terminal device may receive the first resource set indication information and/or the first resource indication information sent by the first access network device. The first resource indication information is shown in fig. 6. The first resource indication information is explained with reference to fig. 7. The first activation indication information may be carried in the same or different message as the first resource indication information. The first activation indication information may be carried in the same or different message as the first resource set indication information.

Before step S1002, further, before step S1001, the second terminal device may receive third resource indication information sent by the first access network device or second resource indication information sent by the first terminal device. The second resource indication information and the third resource indication information refer to the description of fig. 6.

Optionally, the first access network device may send the second activation indication information to the second terminal device. The second activation indication information may be carried in the same or different message as the third resource indication information. And receiving second activation indication information sent by the first access network equipment, and the second terminal equipment can determine the RLM activation state.

Alternatively, before step S1001, the first terminal device may transmit third activation instruction information to the second terminal device. The third activation indication information may be carried in the same or different message as the third resource indication information. The third activation indication information may be used to indicate the second terminal device to start measurement of the first RLM-RS. And receiving second activation indication information sent by the first terminal equipment, and the second terminal equipment can determine the RLM activation state.

In step S1002, the first terminal device transmits the first RLM-RS to the second terminal device.

The first terminal device may transmit the first RLM-RS to the second terminal device after step S1001.

The second terminal device may perform measurement on the first RLM-RS after step S1001.

In one possible implementation, before step S1001, the first terminal device does not transmit a signal for RLM to the second terminal device, e.g., does not transmit the first RLM-RS.

In another possible implementation, before step S1001, the first terminal device transmits a signal for RLM to the second terminal device, but the second terminal device may not perform measurement for RLM. For example, before step S1001, the first terminal device transmits the first RLM-RS to the second terminal device, and the second terminal device does not perform measurement for RLM on the first RLM-RS. After receiving and transmitting the first activation indication information, the second terminal device may perform measurement for RLM on the first RLM-RS.

In step S1003, the first access network device sends the first deactivation indication information to the second terminal device.

The first access network device may send the first deactivation indication information to the first terminal device when the sidelink service does not satisfy the second preset condition.

Receiving the first deactivation indication information sent by the first access network device, the first terminal device may determine the RLM deactivation status.

There may be multiple sidelink services between the first terminal device and the second terminal device, and the first access network device may send the first deactivation indication information to the first terminal device when at least one of the sidelink services does not satisfy the second preset condition. For example, when all the sidelink services do not satisfy the second preset condition, or all the sidelink services taking the first terminal device or the second terminal device as the transmitting end do not satisfy the second preset condition, the first access network device sends the first deactivation indication information to the first terminal device.

In one possible implementation manner, after step S1003, the first terminal device does not send the first RLM-RS to the second terminal device any more.

In another possible implementation, after step S1003, the first terminal device transmits a signal for RLM to the second terminal device, but the second terminal device may not perform measurement for RLM.

Optionally, before step S1001, the first terminal device and/or the second terminal device may send, to the first access network device, the sidelink information between the first terminal device and the second terminal device. The sidelink traffic information may include traffic information and/or channel information.

The monitoring capabilities of the terminal device are limited. Through steps S1001-S1003, the power consumption of the second terminal equipment for RLM is reduced, and the waste of resources is reduced. After the deactivation, the first terminal equipment does not send the RLM-RS signal, so that resources occupied by the RLM-RS signal are reduced, interference among signals can be reduced, and the data transmission efficiency is improved.

Optionally, the first access network device may send the second deactivation indication information to the second terminal device. And receiving second deactivation indication information sent by the first access network equipment, and the second terminal equipment can determine the RLM deactivation state.

After step S1003, the first terminal apparatus may transmit third deactivation indication information to the second terminal apparatus. And receiving the third deactivation indication information sent by the first access network equipment, and the second terminal equipment can determine the RLM deactivation state.

The activation indication information, the first activation indication information, the second activation indication information, and the third activation indication information in the above may be used to indicate that the sidelink is in a condition that needs to be RLM. The case where RLM is required may be referred to as RLM active status, RLM on, or RLM enabled. The deactivation indication information, the first deactivation indication information, the second deactivation indication information, and the third activation indication information in the foregoing may be used to indicate that the sidelink is in a condition that RLM does not need to be performed. The case where RLM is not needed may be referred to as RLM deactivation status, RLM off, or RLM disable.

It should be noted that the first deactivation indication information may be carried in the same message or different messages as the first resource indication information and/or the first resource set indication information. For example, the first deactivation indication information and the first resource indication information are carried in the same message, and the first terminal device may store the resource indicated by the first resource indication information, and send the first RLM-RS on the resource when receiving the first activation message next time.

In this embodiment of the application, RLM status information related to BLM activation and deactivation, for example, activation indication information, first activation indication information, second activation indication information, third activation indication information, deactivation indication information, first deactivation indication information, second deactivation indication information, third deactivation indication information, and the like, sent between different devices may be referred to in table 1.

Table 1 is an illustration of RLM status information and meaning.

TABLE 1

The first access network device may send the activation indication information and the deactivation indication information in a broadcast, multicast or unicast manner.

The first access network device sends the first activation indication information in a broadcast manner, and may instruct all terminal devices in one or more cells covered by the first access network device to determine an RLM activation state, and start sending or measuring RLM-RS.

The first access network device sends the first deactivation indication information in a broadcast manner, which may indicate all terminal devices in one or more cells covered by the first access network device to determine the RLM deactivation state. And the terminal equipment at the sending end of the RLM-RS continues to send or stops sending the RLM-RS according to the indication of the first access network equipment, and the resource configuration of the RLM-RS is invalid or keeps in effect. And the receiving terminal equipment of the RLM-RS stops the measurement of the RLM-RS according to the instruction of the first access network equipment.

The first access network device may send the first activation indication information in a multicast or unicast manner, and activate the RLM status for one or more sidelink. For example, the first access network device may send, by means of unicast, the first activation indication information to the first terminal device, where the first activation indication information is used to indicate an RLM activation state of a sidelink between the first terminal device and the second terminal device. The first access network device may send, in a unicast manner, first activation indication information to the first terminal device, where the first activation indication information is used to indicate RLM activation states of sidelink between the first terminal device and all other terminal devices.

The first access network device may send the first deactivation indication information in a multicast or unicast manner.

Fig. 11 is a method for determining an RLM status by an access network device according to an embodiment of the present application. Steps S1101-S1104 may be performed by an access network device or a terminal device.

In step S1101, an RLM activation condition is set.

Before step S1102, sidelink setup information or sidelink release information may be received. The sidelink establishment information is used for indicating the sidelink establishment between the first terminal equipment and the second terminal equipment. The sidelink release information is used for indicating the sidelink release between the first terminal equipment and the second terminal equipment.

Before step S1102, one or more of traffic level information, channel quality information, and channel occupancy information of the sidelink may also be received.

Before step S1102, a sidelink may be established between the first terminal device and the second terminal device.

Before step S1102, there may be a sidelink service setup between the first terminal device and the second terminal device. That is, there may be sidelink traffic transmission between the first terminal device and the second terminal device.

If the sidelink release can be established between the first terminal device and the second terminal device, step S1102 may not be performed. If no sidelink service transmission is possible between the first terminal device and the second terminal device, step S1102 may not be performed.

In step S1102, it is determined whether the sidelink satisfies the RLM activation condition.

The RLM activation condition may include, for example, a condition related to service level information of the service, a condition related to channel occupancy information of a sidelink that also transmits the service, and a condition related to channel quality information of a sidelink that transmits the service.

If the RLM activation condition is satisfied, go to step S1103; if the RLM activation condition is not satisfied, step S1104 is performed.

In step S1103, the RLM activation status is determined.

After step S1103, steps S1101-1104 are performed by the access network device, and the access network device may send activation indication information to the first terminal device and/or the second terminal device. When entering the RLM activated state from the RLM deactivated state, the access network device may send activation indication information to the first terminal device and/or the second terminal device.

After step S1103, steps S1101-1104 are performed by the first terminal device, which may send activation indication information to the second terminal device. For example, when entering the RLM activated state from the RLM deactivated state, the first terminal device may transmit activation indication information to the second terminal device.

In step S1104, an RLM deactivation status is determined.

After step S1104, steps S1101-1104 are performed by the access network device, and the access network device may send the deactivation indication information to the first terminal device and/or the second terminal device. When entering the RLM activated state from the RLM deactivated state, the access network device may send deactivation indication information to the first terminal device and/or the second terminal device.

After step S1103, steps S1101-1104 are performed by the first terminal device, which may send the deactivation indication information to the second terminal device. For example, when entering the RLM activated state from the RLM deactivated state, the first terminal device may send the deactivation indication information to the second terminal device.

After step S1103 or step S1104, step S1102 may be performed.

Fig. 12 is a method of wireless communication provided herein.

The terminal device may determine the transmitting end of the first RLM-RS according to the pre-configuration information if the terminal device is located outside the coverage of the first access network device. For example, for a sidelink between a first terminal device and a second terminal device, a transmitting end of a sidelink service between the first terminal device and the second terminal device may be determined as a transmitting end of the first RLM-RS, or a receiving end of the service may be determined as a transmitting end of the first RLM-RS. And the transmitting end of the first RLM-RS transmits the first RLM-RS. The first RLM-RS may be used for sidelink monitoring between the first terminal device and the second terminal device.

If the terminal device is located within the coverage of the first access network device, the terminal device may determine the sending end of the first RLM-RS according to the preconfigured information, and may also perform steps S1201-S1202.

In some cases, there may be a plurality of different services between the first terminal device and the second terminal device. For a sidelink between a first terminal device and a second terminal device, the first terminal device may be both a service transmitting end and a service receiving end.

If the sending end of the sidelink service between the first terminal device and the second terminal device is determined to be used as the sending end of the first RLM-RS, the first terminal device and the second terminal device both need to send the first RLM-RS and measure the first RLM-RS, and system resources are wasted.

The second terminal device may establish a sidelink with the plurality of first terminal devices and act as a receiving end for sidelink traffic. If it is determined that the sending end of the sidelink service between the first terminal device and the second terminal device is used as the sending end of the first RLM-RS, the second terminal device needs to measure the first RLM-RS sent by the plurality of first terminal devices. Due to the limited capability of the second terminal device, the RLM monitoring cannot be guaranteed.

The terminal device that is the transmitting end of the RLM-RS signal may be determined by the conditions of the first RLM-RS transmitting end. For example, the condition may be a terminal device with stronger transmitting capability, a terminal device with weaker monitoring capability, a terminal device that is used as a receiving end of the sidelink service with higher requirement on transmission quality, and the like. The first terminal device may determine the terminal device serving as the sending end of the RLM-RS signal through information interaction of the terminal device regarding sending capability, monitoring capability, requirements for transmission quality of sidelink service, and the like.

To solve the above problem, steps S1201-S1202 may be performed.

In step S1201, the first access network device sends the first sender indication information to the first terminal device. The first sending end indication information is used for indicating the first terminal equipment as a sending end of the first RLM-RS.

Optionally, the first access network device may further send second sending-end indication information to the second terminal device. The first sending end indication information is used for indicating the first terminal equipment as a sending end of the first RLM-RS.

Alternatively, after step S1201, the first terminal device may transmit third transmitting-end indication information to the second terminal device. The first sending end indication information is used for indicating the first terminal equipment as a sending end of the first RLM-RS.

That is, the first access network device may send the sender indication information to the first terminal device, and the first terminal device sends the sender indication information to the second terminal device. The first access network equipment sends the sending end indication information to the first terminal equipment and the second terminal equipment. The first terminal equipment and the second terminal equipment receive the indication information of the sending end, namely, the first terminal equipment and the second terminal equipment can know whether the first terminal equipment and the second terminal equipment are one end for sending RLM-RS signals or one end for receiving the RLM-RS signals. The sending end indication information may include first sending end indication information, second sending end indication information, and third sending end indication information.

The access network device may send the sending end indication information to the terminal device in a broadcast, multicast, or unicast manner.

Table 2 provides fields and their meanings included in a message sent by a first access network device.

TABLE 2

The first access network device may also send parameters of the period, bandwidth, density, etc. of the first RLM-RS. The density of the RLM-RS signals may refer to the number of Resource Elements (REs) occupied by the RLM-RS signals in one Resource Block (RB). For example, if 1RE is allocated with a reference signal in every 1 RB (12 REs), the density is considered to be 1. In every 1 RB (12 REs), 3 REs are allocated with reference signals, and the density is considered to be 3. In 2 RBs (12 REs), 1RE is allocated a reference signal, and the density is considered to be 0.5.

The destination address may indicate the device that receives the information. The first RLM-RS resource ID may represent a first RLM-RS resource carrying the first RLM-RS. The first RLM-RS sender ID may indicate a terminal device that is the first RLM-RS sender. The first RLM-RS receiver ID may indicate a terminal device that is the first RLM-RS receiver.

The transmitting end indication information may include a first identifier, and a terminal device corresponding to the first identifier may serve as a transmitting end of the first RLM-RS, that is, the terminal device transmits the first RLM-RS. The transmitting end indication information may also include a second identifier, and a terminal device corresponding to the second identifier may be used as a receiving end of the first RLM-RS, that is, the terminal device measures the first RLM-RS.

And the first access network equipment indicates the terminal equipment as a first RLM-RS sending end and a first RLM-RS receiving end in an explicit indication mode or an implicit indication mode.

In the explicit indication mode, the first sending end indication information may include information of a terminal device serving as the first RLM-RS sending end and/or receiving end, for example, an identifier or an address of the terminal device. The explicit indication may refer to the messages shown in table 2.

The implicit indication manner may be, for example, that a terminal device receiving the first resource indication information is used as the first RLM-RS sending terminal, or that a terminal device receiving the first resource set indication information is used as the first RLM-RS sending terminal, and that a terminal device receiving the first activation indication information is used as the first RLM-RS sending terminal. First resource indication information referring to fig. 6, first resource set indication information referring to fig. 7, and first activation indication information referring to fig. 9.

In an implicit indication mode, the first access network device may further send indication information of a to-be-sent end to the first terminal device and/or the second terminal device, where the indication information is used to indicate that the first terminal device and/or the second terminal device determines the terminal device to be used as the first RLM-RS sending end. Optionally, the negotiation indication information may include a condition of the first RLM-RS sending end, for example, the condition may be a terminal device with a stronger sending capability, a terminal device with a weaker monitoring capability, a terminal device serving as a side link service receiving end with a higher transmission quality requirement, and the like.

In step S1202, the first terminal device transmits the first RLM-RS to the second terminal device.

Through steps S1201-1202, the configuration of the access network device for the first RLM-RS transmitting end may be implemented. And the control of the access network equipment on the side uplink monitoring is enhanced.

Fig. 13 is a schematic diagram of a scenario of sidelink wireless communication. The scenario is a multicast scenario, that is, a certain terminal device in the group is a sending end of the sidelink service, and other terminal devices are receiving ends of the sidelink service. In order to ensure the reliability of data reception of the sidelink service by other terminal devices, it is necessary that one or more terminal devices in the group can perform data forwarding.

As shown in fig. 13, a terminal device 1301 is a transmitting end of a sidelink service, and a terminal device 1302, a terminal device 1303, and a terminal device 1304 are receiving ends of the sidelink service. Terminal device 1302 can forward received sidelink traffic data. For example, the link quality between terminal device 1303 and terminal device 1301 is poor, and terminal device 1302 forwards the received sidelink data. At this time, RLM is performed on a first sidelink between the second terminal device and the first terminal device and a second sidelink between the second terminal device and the first terminal device, so as to ensure that one of the first sidelink and the second sidelink meets the service requirement of the sidelink.

Fig. 14 is a schematic flow chart of a wireless communication method according to an embodiment of the present application.

And side link service transmission is carried out between the first terminal equipment and the second terminal equipment. The first terminal device may serve as a sending end of the sidelink service, and the second terminal device may serve as a receiving end of the sidelink service. The sidelink service transmission is also carried out between the first terminal equipment and the second terminal equipment. The second terminal device may also act as a forwarding node for the sidelink traffic from the third terminal device. The third terminal device may serve as a sending end of the sidelink service, and the second terminal device may serve as a receiving end of the sidelink service.

For a first sidelink between the second terminal device and the first terminal device, and a second sidelink between the second terminal device and the third terminal device, only one of them can ensure the transmission of the sidelink service. Therefore, RLM needs to be performed for the first sidelink and the second sidelink separately.

RLM for the first sidelink and the second sidelink may refer to the methods of fig. 4-12.

The first access network device may send one or more of the first resource indication information, the first resource set indication information, the first activation indication information, and the first sending end indication information terminal to the first terminal device or the second terminal device.

The first access network device may indicate the sending end of the first RLM-RS in an explicit or implicit manner.

The first access network device may send a similar message to the third terminal device or the second terminal device instructing the third terminal device or the second terminal device to RLM the second downlink.

Table 3 provides fields and their meanings included in a message sent by a first access network device.

TABLE 3

The first access network device may also send parameters of the period, bandwidth, density, etc. of the first RLM-RS. The first access network equipment can also send parameters such as the period, the bandwidth and the density of the second RLM-RS signal. The density of the RLM-RS signals may refer to the number of REs occupied by the RLM-RS signals in one RB.

The second RLM-RS signal is used for sidelink monitoring between the third terminal device and the second terminal device.

Illustratively, the first sidelink and the second sidelink may be measured by the same RLM-RS signal.

In step S1401, the first terminal device and the third terminal device transmit a first RLM-RS;

in step S1402, the second terminal device measures the first RLM-RS.

The first RLM-RS is used for sidelink monitoring between the first terminal device and the second terminal device.

The first terminal device and the third terminal device may send the first RLM-RS to be carried on the same resource, that is, may be carried on the first RLM-RS resource.

The purpose of sidelink monitoring is to ensure the transmission of sidelink traffic between terminal devices. Therefore, for the case that the second terminal device can receive the same sidelink service from the first terminal device or the third terminal device, for the first sidelink between the second terminal device and the first terminal device, and the second sidelink between the second terminal device and the first terminal device, only one of them can guarantee the transmission of the sidelink service. Therefore, through steps S1401-S1402, it is able to ensure effective monitoring of the sidelink by the second terminal device, and reduce waste of resources.

RLM between the second terminal device and the third terminal device may refer to the methods of fig. 4-12.

The first access network device indicates the RLM between the second terminal device and the third terminal device and between the second terminal device and the first terminal device, so that the complexity in the process and the signaling overhead caused by the complex information interaction between the terminal devices can be avoided.

Optionally, the first terminal device may send the indication information to the first terminal device and the third terminal device. The indication information may include one or more of first resource indication information, first resource set indication information, first activation indication information, and first sender indication information terminal.

Illustratively, the second terminal device transmits a first RLM-RS; the first terminal device and the third terminal device measure the first RLM-RS.

Fig. 15 is a schematic diagram of a format of an RLM-RS signal according to an embodiment of the present application.

In some possible implementations, the amplitude of the received signal or the high and low level thresholds of the analog-to-digital conversion need to be adjusted by the AGC for RLM.

The signals received by the terminal equipment through the wireless link are analog signals. In order to determine the measurement results of SNR, SINR, RSRP, RSRQ, noise power, etc. of the received reference signal, the terminal device needs to convert the received analog signal into a digital signal in order to determine the noise in the signal. Converting an analog signal to a digital signal is also referred to as analog-to-digital conversion. In the process of analog-to-digital conversion of signals, the amplitude of the analog signals is too large or too small, so that the converted digital signals are wrong, and correct measurement results cannot be obtained.

In order to solve the above problem, the present application proposes a format of an RLM-RS signal. The first RLM-RS is the same over two time units that are equal in the time domain.

By sending the same signal in two equal time units, the terminal device can adjust the amplitude of the signal in the next time unit according to the signal in the previous time unit in terms of time, or adjust the high-low level threshold for performing analog-to-digital conversion on the signal in the next time unit, and can realize correct analog-to-digital conversion on the signal in the next time unit, that is, realize AGC.

The RLM-RS signal occupies RLM-RS resources. The RLM-RS resource includes at least two symbols, and signals in the two symbols are the same. Where the signal on the temporally preceding symbol is used for AGC and the signal on the temporally following symbol is used for RLM. For example, the first RLM-RS resource, denoted as 1, may occupy resources of symbol #3 and symbol #4 in fig. 15. The contents of #3 and #4 are the same, where the signal at #3 can be used as the AGC adjustment symbol at the receiving end, and #4 is used as the measurement signal of RLM. The symbol lengths of #3 and #4 are the same as the symbol length of the non-RLM-RS (e.g. PSCCH/PSSCH channel resources), i.e. the same subcarrier spacing (SCS) is used. The time length represented by the symbol is not limited in the embodiments of the present application. In general, time (T) 10 milliseconds (ms) may represent one frame, time 1ms may represent one subframe, one subframe may include 2 slots, and each slot may include 6 or 7 symbols.

Fig. 16 is a schematic diagram of a format of an RLM-RS signal according to an embodiment of the present application.

The RLM-RS signal occupies RLM-RS resources. The RLM-RS resource includes at least one symbol. This one symbol time length comprises two sub-time units. The signals in the two sub-time units are identical. Where the signal on a sub-time unit preceding in time is used for AGC and the signal on a sub-time unit following in time is used for RLM. For example, the first RLM-RS resource is identified as 1, occupying symbol #3, where the time length of #3 is divided into two sub-time units, respectively #3-1 and #3-2, each sub-time unit is a new sub-symbol, the sub-symbol length is half of the symbol length, and the SCS of the corresponding sub-symbol is 2 times the SCS of the symbol. Such as: the SCS for symbol #0 is 15KHz, and the resource SCS for RLM-RS transmission is 30 KHz. And the symbol on #3-1 is the same as the information carried on #3-2, or #3-1 is the content of repetition # 3-2.

Fig. 17 is a schematic diagram of a format of an RLM-RS signal according to an embodiment of the present application.

The multiplexing relationship among different RLM-RS resources can be frequency division multiplexing, time division multiplexing or code division multiplexing. The multiplexed reference signal is also repeatedly transmitted. Fig. 17 is a case of frequency division multiplexing of different RLM-RS resources. On symbol #4, the first RLM-RS occupies the first RLM-RS resource, and is identified as 1. And the second RLM-RS occupies a second RLM-RS resource and is marked as 2. The RLM-RS resource 1 and the RLM-RS resource 2 are frequency division multiplexed, and the contents of the symbol #4 after frequency division multiplexing are repeatedly transmitted on the symbol # 3. The first and second RLM-RSs may be reference signals for RLM for different sidelink. That is, reference signals for RLMs of different sidelink can be configured on different frequencies in a frequency division manner, so as to implement RLMs of different sidelinks. For example, each RLM-RS occupies one RE, and a first RLM-RS transmitted by the first terminal device and a second RLM-RS transmitted by the third terminal device may be located in the same symbol and different subcarriers. The second terminal device may receive the first RLM-RS transmitted by the first terminal device and the second RLM-RS transmitted by the third terminal device in the same symbol.

The first and second RLM-RSs may be transmitted on the same time domain. The second terminal device may receive the first RLM-RS and the second RLM-RS. The second terminal device may use the first RLM-RS and the second RLM-RS received earlier in time as signals for AGC and the first RLM-RS and the second RLM-RS received later in time as signals for RLM. The second terminal device uses the first RLM-RS and the second RLM-RS as signals for AGC, and the amplitude of the received signal or the high-low level threshold of analog-to-digital conversion can be adjusted according to the power or amplitude of the first RLM-RS and the second RLM-RS.

Through the manner shown in fig. 15-17, the sending end of the RLM-RS signal repeatedly sends the same signal, which is simpler and easier to implement, simplifies the implementation complexity of the terminal device, and solves the problem that there is no AGC reference signal in the RLM-RS signal. As shown in fig. 16, AGC and RLM can be implemented by one symbol. That is, the RLM-RS may employ a larger SCS (shorter time length unit), thereby being able to reduce waste of system resources.

Fig. 18 is a schematic flow chart of a wireless communication method according to an embodiment of the present application.

In step S1801, the second terminal device receives the second resource set indication information. The second resource set indication information corresponds to at least one candidate resource. The candidate resource may be used for sidelink monitoring between the first terminal device and the second terminal device.

In one possible implementation, the first terminal device may send the second resource set indication information to the second terminal device.

Before step S1801, the first terminal device may receive the first resource set indication information sent by the first access network device. The first resource set indication information is shown in fig. 7. The resource corresponding to the second resource set indication information may include one or more of the resources corresponding to the first resource set indication information. The resource corresponding to the second resource set indication information may be the same as the resource corresponding to the first resource set indication information, or may include more or less resources.

In another possible implementation manner, the first access network device may send the second resource set indication information to the second terminal device.

The first terminal device may transmit the second resource set indication information to the second terminal device through a MAC Control Element (CE) or through physical layer control channel information.

Prior to step S1802, the first terminal device may transmit measurement signal indication information to the second terminal device. The measurement signal indication information is used for indicating that the first terminal equipment transmits a signal with zero power or a signal with non-zero power on at least one candidate resource. The zero-power signal transmitted by the first terminal device on at least one candidate resource may be understood as a zero-power reference signal configured on the resource indicated by the resource set, and the zero-power reference signal is used for measuring interference of the resource. Likewise, the non-zero power signal transmitted by the first terminal device on at least one candidate resource may be understood as that a non-zero power reference signal is configured on the resource indicated by the resource set, and the non-zero power reference signal is used for measuring interference, SNR, SINR, and the like of the resource.

Prior to step S1802, the second terminal apparatus may receive zero power RLM-RS resource configuration information. The zero-power RLM-RS resource configuration information may also be referred to as zero-power location indication information. The zero power RLM-RS resource configuration information is used for indicating resources used for the zero power RLM-RS. The resources of the zero-power RLM-RS belong to the set of resources. The zero-power RLM-RS resource configuration information may be sent by the first access network device to the first terminal device and the second terminal device. The first access network device may configure the information to configure resources occupied by the zero-power reference signal. The zero-power RLM-RS resource configuration information may also be transmitted by the first terminal device. The first terminal device may also configure the resources occupied by the reference signal of zero power.

In step S1802, the second terminal device performs measurement on at least one candidate resource.

The second terminal device may measure the energy on the at least one candidate resource if the first terminal device transmits a reference signal of zero power. This energy is the interference signal energy. The first terminal device transmits a reference signal with zero power, which can be understood as that the first terminal device does not transmit a signal on the resource. The second terminal device measures the interference at the location.

The second terminal device may measure interference, SINR or SNR on the at least one candidate resource if the first terminal device transmits a non-zero power signal.

In step S1803, the second terminal device sends fourth resource indication information to the first terminal device or the first access network device. The fourth resource indication information is used for indicating the first RLM-RS resource.

The first RLM-RS resource may be one or more of the resources corresponding to the first resource set indication information, which have a higher SINR or a higher SNR or a lower interference signal energy.

If the second terminal device sends the fourth resource indication information to the first access network device, the first access network device may send the first resource indication information to the first terminal device before step S1804. The first resource indication information may be referred to fig. 6.

In step S1804, the first terminal device transmits the first RLM-RS to the second terminal device. The first RLM-RS is carried on the first RLM-RS resource.

Through steps S1801 to S1804, at least one candidate resource may be selected, and a resource with small interference is selected as a resource for sending the RLM-RS, which is beneficial to reducing interference of the RLM-RS and improving accuracy of monitoring channel quality. In addition, by measuring the zero-power signal, the interference to other signals can be reduced, and the influence on the system can be reduced.

It should be noted that the measurement on the at least one candidate resource may also be performed by the transmitting end of the first RLM-RS.

The first terminal device may receive the first resource set indication information. The second resource set indication information corresponds to at least one candidate resource. The candidate resource may be used for sidelink monitoring between the first terminal device and the second terminal device. The first resource set indication information may be seen in fig. 7.

The second terminal device may transmit measurement signal indication information to the first terminal device for indicating whether the second terminal device transmits a signal of zero power or a signal of non-zero power on the at least one candidate resource.

The first terminal device may perform measurements on at least one candidate resource.

The first terminal device may send the fourth resource indication information to the second terminal device. The fourth resource indication information is used for indicating the first RLM-RS resource. The first RLM-RS resource may be one or more RLM-RS resources with the highest SINR, the highest SNR, or the lowest interfering signal energy among the resources corresponding to the first resource set indication information, where SINR, SNR, or interference satisfy a preset value.

The first terminal device sends the first RLM-RS to the second terminal device. The first RLM-RS is carried on the first RLM-RS resource.

Method embodiments of the present application are described above in conjunction with fig. 1-18, and apparatus embodiments of the present application are described below in conjunction with fig. 19-22. It is to be understood that the description of the method embodiments corresponds to the description of the apparatus embodiments, and therefore reference may be made to the preceding method embodiments for parts not described in detail.

Fig. 19 is a schematic structural diagram of a terminal device according to an embodiment of the present application. Terminal device 1900 includes:

a generating module 1910 configured to generate a first radio link monitoring reference signal RLM-RS, where the first RLM-RS is used for monitoring a sidelink between the terminal device 1900 and the second terminal device;

a transceiver module 1920 configured to send the first RLM-RS to a second terminal device.

Optionally, the transceiver module 1920 is further configured to receive first resource indication information from a first access network device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to transmit the first RLM-RS.

Optionally, the first resource indication information includes an identifier of the first time-frequency resource.

Optionally, the terminal device 1900 further includes a determining module configured to determine a first time-frequency resource from a set of resources, where the first time-frequency resource is used for transmitting the first RLM-RS, and the resource in the set of resources is used for transmitting the RLM-RS in the sidelink.

Optionally, the transceiver module 1920 is further configured to receive indication information of the resource set from the first access network device; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

Optionally, the transceiver module 1920 is further configured to transmit zero-power RLM-RS resource configuration information to the second terminal device, where the zero-power RLM-RS resource configuration information is used to indicate a resource for a zero-power RLM-RS, where the resource of the zero-power RLM-RS belongs to the resource set, and the zero-power RLM-RS is used for interference measurement; the transceiver module 1920 is further configured to receive second resource indication information from the second terminal device, where the second resource indication information is used to indicate that at least one resource with smaller interference is the first time-frequency resource, and the interference is smaller and/or is smaller than a preset value.

Optionally, the transceiver module 1920 is further configured to receive first activation information from the first access network device or the second terminal device, where the first activation information is used to instruct the terminal device 1900 to transmit the RLM-RS.

Optionally, the transceiver module 1920 is further configured to receive first deactivation information from the first access network device or the second terminal device, where the first activation information is used to instruct the terminal device 1900 to stop RLM-RS transmission.

Optionally, the transceiver module 1920 is further configured to send second activation information to the second terminal device, where the second activation information is used to instruct the second terminal device to perform measurement on RLM-RS.

Optionally, the transceiver module 1920 is further configured to send second deactivation information to the second terminal device, where the second deactivation information is used to instruct the second terminal device to stop the measurement of the RLM-RS.

Optionally, the transceiver module 1920 is further configured to receive, from a first access network device, transmission indication information, where the transmission indication information is used to indicate that the terminal device 1900 transmits the first RLM-RS to the second terminal device in a radio link monitoring procedure.

Optionally, the transceiver module 1920 is further configured to repeatedly transmit the first RLM-RS to the second terminal device in the time domain.

Optionally, the interval of the first RLM-RS repeatedly transmitted is 0 symbol.

Optionally, the first RLM-RS comprises at least one of the following signals: the channel state information reference signal CSI-RS of the side link, the synchronizing signal of the side link and the demodulation reference signal DMRS of the side link.

Fig. 20 is a schematic structural diagram of a terminal device according to an embodiment of the present application. Terminal device 2000, comprising:

a transceiver module 2010, configured to receive a first radio link monitoring reference signal RLM-RS from a first terminal device, where the first RLM-RS is used for monitoring a sidelink between the first terminal device and the terminal device 2000;

a measurement module 2020 for measuring the first RLM-RS.

Optionally, the transceiver module 2010 is further configured to receive first resource indication information from a first access network device or the first terminal device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

Optionally, the transceiver module 2010 is further configured to receive indication information of the resource set from the first access network device; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

Optionally, the transceiver module 2010 is further configured to receive, from the first terminal device, zero-power RLM-RS resource configuration information, where the zero-power RLM-RS resource configuration information is used to indicate a resource of a reference signal for zero power, where the resource of the zero-power RLM-RS belongs to the resource set, and the zero-power RLM-RS is used for interference measurement;

the measuring module 2020 is further configured to measure interference of the resource of the zero-power reference signal;

the transceiver module 2010 is further configured to send second resource indication information to the first terminal device or the first access network device, where the second resource indication information is used to indicate that at least one resource with smaller interference is the first time-frequency resource, and the interference with smaller interference includes minimum interference and/or interference smaller than a preset value.

Optionally, the transceiver module 2010 is further configured to receive first activation information from a first access network device or the first terminal device, where the first activation information is used to instruct the terminal device 2000 to measure the first RLM-RS.

Optionally, the transceiver module 2010 is further configured to receive first deactivation information from a first access network device or the first terminal device, where the first activation information is used to instruct the terminal device 2000 to stop the measurement on the first RLM-RS.

Optionally, the transceiver module 2010 is further configured to send second activation information to the first terminal device, where the second activation information is used to instruct the first terminal device to send an RLM-RS.

Optionally, the transceiver module 2010 is further configured to send second deactivation information to the first terminal device, where the second activation information is used to instruct the first terminal device to stop sending the RLM-RS.

Optionally, the transceiver module 2010 is further configured to receive, from a first access network device, transmission indication information, where the transmission indication information is used to indicate that the first terminal device transmits the first RLM-RS to the terminal device 2000 in a radio link monitoring process.

Optionally, the transceiver module 2010 is further configured to receive the first RLM-RS repeatedly transmitted in the time domain from the first terminal device.

Optionally, the time interval of the first RLM-RS repeatedly transmitted is 0 symbol.

Fig. 21 is a schematic structural diagram of an access network device according to an embodiment of the present application. An access network apparatus 2100, comprising:

a generating module 2110 for generating first indication information;

a transceiver module 2120, configured to send the first indication information to a first terminal device;

the first indication information comprises at least one of the following information:

first resource indication information, configured to indicate a first time-frequency resource, where the first time-frequency resource is used to transmit a first RLM-RS, and the first RLM-RS is used for sidelink monitoring between the first terminal device and the second terminal device;

first resource set indication information for indicating a resource set, wherein resources in the resource set are used for transmitting RLM-RS, and the first time-frequency resources belong to the resource set;

first activation information for instructing the first terminal device to transmit an RLM-RS;

first deactivation information for instructing the first terminal device to stop transmission of the RLM-RS;

and sending indication information for indicating that the first terminal equipment sends the first RLM-RS to the second terminal equipment in a radio link monitoring process.

Optionally, the first indication information includes the resource set indication information and zero-power RLM-RS resource configuration information, where the zero-power RLM-RS resource configuration information is used to indicate resources for a reference signal with zero power, and the resources for the zero-power RLM-RS belong to the resource set, and the zero-power RLM-RS is used for interference measurement;

optionally, the first access network device 2100 includes a measuring module configured to measure interference of resources of the zero-power reference signal;

the transceiver module 2120 is further configured to send second resource indication information to the first terminal device or the first access network device, where the second resource indication information is used to indicate that at least one resource with smaller interference is the first time-frequency resource, and the smaller interference includes minimum interference and/or interference smaller than a preset value. .

Optionally, the first indication information includes the first resource indication information, and the resource indication information includes an identifier of the first time-frequency resource.

Optionally, the transceiver module 2120 is further configured to send the second indication information to the second terminal device;

the first indication information comprises at least one of the following information: the first resource indication information, the resource set indication information, the first activation information, the first deactivation information, and the transmission indication information.

Optionally, the first RLM-RS comprises at least one of the following signals: the channel state information reference signal CSI-RS, the synchronizing signal and the demodulation reference signal DMRS.

Fig. 22 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication means 2200 shown in fig. 22 may correspond to the terminal device or the access network device described earlier. The communication device 2200 may include: at least one processor 2210 and a communication interface 2220, the communication interface 2220 being usable for the communication apparatus 2200 to perform information interaction with other communication apparatuses, when the program instructions are executed in the at least one processor 2210, the communication apparatus 2200 is enabled to implement the respective steps or methods or operations or functions performed by the network device in the foregoing.

An embodiment of the application provides a terminal device, which includes at least one processor and a communication interface.

A processor configured to generate a first radio link monitoring reference signal, RLM-RS, for monitoring of a sidelink between the terminal device and the second terminal device;

a communication interface for transmitting the first RLM-RS to a second terminal device.

Optionally, the communication interface is further configured to receive first resource indication information from a first access network device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to transmit the first RLM-RS.

Optionally, the terminal device further includes a determining module, configured to determine a first time-frequency resource from a set of resources, where the first time-frequency resource is used for transmitting the first RLM-RS, and the resource in the set of resources is used for transmitting the RLM-RS in the sidelink.

Optionally, the communication interface is further configured to receive, from the first access network device, information indicative of the set of resources; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

Optionally, the communication interface is further configured to send zero power RLM-RS resource configuration information to the second terminal device, where the zero power RLM-RS resource configuration information is used to indicate a resource for a zero power RLM-RS, where the resource of the zero power RLM-RS belongs to the resource set, and the zero power RLM-RS is used for interference measurement; the communication interface is further configured to receive second resource indication information from the second terminal device, where the second resource indication information is used to indicate that at least one resource with smaller interference is the first time-frequency resource, and the interference is smaller and includes minimum interference and/or interference smaller than a preset value.

Optionally, the communication interface is further configured to receive first activation information from the first access network device or the second terminal device, where the first activation information is used to instruct the terminal device to send the RLM-RS.

Optionally, the communication interface is further configured to receive first deactivation information from the first access network device or the second terminal device, where the first activation information is used to instruct the terminal device to stop sending the RLM-RS.

Optionally, the communication interface is further configured to send second activation information to the second terminal device, where the second activation information is used to instruct the second terminal device to perform measurement on the RLM-RS.

Optionally, the communication interface is further configured to send second deactivation information to the second terminal device, where the second deactivation information is used to instruct the second terminal device to stop the measurement of the RLM-RS.

Optionally, the communication interface is further configured to receive, from the first access network device, transmission indication information, where the transmission indication information is used to indicate that the terminal device transmits the first RLM-RS to the second terminal device in a radio link monitoring process.

Optionally, the communication interface is further configured to repeatedly transmit the first RLM-RS to the second terminal device in a time domain.

A communication interface configured to receive a first radio link monitoring reference signal, RLM-RS, from a first terminal device, the first RLM-RS being used for monitoring of a sidelink between the first terminal device and the terminal device;

a processor configured to perform measurements on the first RLM-RS.

Optionally, the communication interface is further configured to receive first resource indication information from a first access network device or the first terminal device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

Optionally, the communication interface is further configured to receive, from the first terminal device, zero power RLM-RS resource configuration information, where the zero power RLM-RS resource configuration information is used to indicate resources for reference signals of zero power, and the resources of the zero power RLM-RS belong to the resource set, and the zero power RLM-RS is used for interference measurement;

the processor is further configured to measure interference of resources of the zero-power reference signal;

the communication interface is further configured to send second resource indication information to the first terminal device or the first access network device, where the second resource indication information is used to indicate that at least one resource with smaller interference is the first time-frequency resource, and the smaller interference includes minimum interference and/or interference smaller than a preset value.

Optionally, the communication interface is further configured to receive first activation information from a first access network device or the first terminal device, where the first activation information is used to instruct the terminal device to perform measurement on RLM-RS.

Optionally, the communication interface is further configured to receive first deactivation information from a first access network device or the first terminal device, where the first activation information is used to instruct the terminal device to stop the RLM-RS measurement.

Optionally, the communication interface is further configured to send second activation information to the first terminal device, where the second activation information is used to instruct the first terminal device to send the RLM-RS.

Optionally, the communication interface is further configured to send second deactivation information to the first terminal device, where the second activation information is used to instruct the first terminal device to stop sending the RLM-RS.

Optionally, the communication interface is further configured to receive, from the first access network device, transmission indication information, where the transmission indication information is used to indicate that the first terminal device transmits the first RLM-RS to the terminal device in a radio link monitoring process.

Optionally, the communication interface is further configured to receive, from the first terminal device, the first RLM-RS repeatedly transmitted in the time domain.

One embodiment of the present application provides an access network device comprising at least one processor and a communication interface.

A processor for generating first indication information;

a communication interface, configured to send the first indication information to a first terminal device;

Optionally, the first indication information includes the resource set indication information and zero power position indication information, the zero power position indication information is used to indicate a position of a zero power reference signal in each resource of the resource set, and the zero power reference signal is used for measurement of interference of the resource;

the communication interface is further configured to receive second resource indication information from the second terminal device, where the second resource indication information is used to indicate that at least one resource with less interference is the first time-frequency resource.

Optionally, the communication interface is further configured to send the second indication information to the second terminal device;

An embodiment of the present application further provides a communication system, which includes one or more of the foregoing network devices.

Embodiments of the present application further provide a computer program storage medium, which is characterized by having program instructions, when executed, cause the method in the foregoing to be performed.

An embodiment of the present application further provides a chip system, where the chip system includes at least one processor, and when the program instructions are executed in the at least one processor, the method in the foregoing is performed.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiments of the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple. It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of wireless communication, comprising:

a first terminal device generates a first radio link monitoring reference signal (RLM-RS), wherein the first RLM-RS is used for monitoring a side link between the first terminal device and a second terminal device;

and the first terminal equipment sends the first RLM-RS to second terminal equipment.

2. The method of claim 1, wherein before the first terminal device sends the first RLM-RS to the second terminal device, comprising:

the first terminal device receives first resource indication information from a first access network device, wherein the first resource indication information is used for indicating first time-frequency resources, and the first time-frequency resources are used for sending the first RLM-RS.

3. The method of claim 2, wherein the first resource indication information comprises an identification of the first time-frequency resource.

4. The method of claim 1, wherein before the first terminal device sends the first RLM-RS to the second terminal device, comprising:

the first terminal device determines a first time-frequency resource from a resource set, wherein the first time-frequency resource is used for sending the first RLM-RS, and the resources in the resource set are used for transmitting the RLM-RS in a side uplink.

5. The method according to any one of claims 1-4, further comprising:

the first terminal equipment receives indication information of the resource set from the first access network equipment; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

6. The method according to claim 4 or 5, wherein before the first terminal device sends the first RLM-RS to the second terminal device, comprising:

the first terminal equipment sends zero power RLM-RS resource configuration information to the second terminal equipment, wherein the zero power RLM-RS resource configuration information is used for indicating resources used for zero power RLM-RS, the resources of the zero power RLM-RS belong to the resource set, and the zero power RLM-RS is used for interference measurement;

the first terminal equipment receives second resource indication information from the second terminal equipment, wherein the second resource indication information is used for indicating a first time-frequency resource with smaller interference, and the smaller interference comprises minimum interference and/or interference smaller than a preset value.

7. The method according to any of claims 1-6, wherein before the first terminal device sends the first RLM-RS to the second terminal device, comprising:

the first terminal equipment receives first activation information from first access network equipment or the second terminal equipment, wherein the first activation information is used for indicating the first terminal equipment to send RLM-RS.

8. The method according to any of claims 1-7, comprising, after the first terminal device sends the first RLM-RS to the second terminal device:

the first terminal device receives first deactivation information from a first access network device or the second terminal device, wherein the first activation information is used for indicating the first terminal device to stop sending RLM-RS.

9. The method according to any of claims 1-6, wherein before the first terminal device sends the first RLM-RS to the second terminal device, comprising:

and the first terminal equipment sends second activation information to the second terminal equipment, wherein the second activation information is used for indicating the second terminal equipment to measure the first RLM-RS.

10. The method according to any of claims 1-9, comprising, before the first terminal device transmits the first RLM-RS to the first terminal device on the first time-frequency resource:

the first terminal device receives sending indication information from a first access network device, wherein the sending indication information is used for indicating that the first terminal device sends the first RLM-RS to the second terminal device in a radio link monitoring process.

11. A method of wireless communication, comprising:

a second terminal device receives a first radio link monitoring reference signal (RLM-RS) from a first terminal device, wherein the first RLM-RS is used for monitoring a side link between the first terminal device and the second terminal device;

and the second terminal equipment measures the first RLM-RS.

12. The method of claim 11, wherein prior to the second terminal device receiving the first RLM-RS from the first terminal device, comprising:

the second terminal device receives first resource indication information from a first access network device or the first terminal device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

13. The method of claim 12, wherein the first resource indication information comprises an identification of the first time-frequency resource.

14. The method according to any of claims 11-13, comprising, before the second terminal device receives the first RLM-RS from the first terminal device:

the second terminal equipment receives the indication information of the resource set from the first access network equipment; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

15. The method of claim 14, wherein prior to the second terminal device receiving the first RLM-RS from the first terminal device, comprising:

the second terminal device receiving, from the first terminal device or the first access network device, zero power RLM-RS resource configuration information, the zero power RLM-RS resource configuration information indicating resources for a reference signal of zero power, the resources of the zero power RLM-RS belonging to the set of resources, the zero power RLM-RS being used for measurement of interference;

the second terminal equipment measures the interference of the resource of the reference signal with zero power;

and the second terminal equipment sends second resource indication information to the first terminal equipment or the first access network equipment, and the second resource indication information is used for indicating at least one resource with smaller interference as the first time-frequency resource, wherein the smaller interference comprises the smallest interference and/or the interference smaller than a preset value.

16. The method according to any of claims 11-15, comprising, before the second terminal device receives the first RLM-RS from the first terminal device:

the second terminal device receives first activation information from a first access network device or the first terminal device, wherein the first activation information is used for instructing the second terminal device to measure the first RLM-RS.

17. The method according to any one of claims 11-16, further comprising:

the second terminal device receives first deactivation information from a first access network device or the first terminal device, wherein the first activation information is used for instructing the second terminal device to stop measuring the first RLM-RS.

18. The method according to any of claims 11-17, comprising, before the second terminal device receives the first RLM-RS from the first terminal device:

and the second terminal equipment sends second activation information to the first terminal equipment, wherein the second activation information is used for indicating the first terminal equipment to send the first RLM-RS.

19. The method according to any of claims 11-18, wherein before the second terminal device receives the first RLM-RS from the first terminal device, comprising:

and the second terminal equipment receives transmission indication information from first access network equipment, wherein the transmission indication information is used for indicating that the first terminal equipment transmits the first RLM-RS to the second terminal equipment in a radio link monitoring process.

20. A method of wireless communication, comprising:

the first access network equipment generates first indication information;

the first access network equipment sends the first indication information to first terminal equipment;

resource set indication information for indicating a resource set, wherein resources in the resource set are used for transmitting RLM-RS, and the first time-frequency resource belongs to the resource set;

first activation information for instructing the first terminal device to transmit a first RLM-RS;

first deactivation information for instructing the first terminal device to stop transmission of the first RLM-RS;

21. The method of claim 20, wherein the first indication information comprises the resource set indication information and zero power position indication information,

the zero power position indication information is used for indicating the position of a zero power reference signal in each resource of the resource set, and the zero power reference signal is used for measuring the interference of the resource;

and the first access network equipment receives second resource indication information from the second terminal equipment, and the second resource indication information is used for indicating at least one resource with smaller interference as the first time-frequency resource.

22. A terminal device, comprising:

a generating module, configured to generate a first radio link monitoring reference signal RLM-RS, where the first RLM-RS is used for monitoring a sidelink between the terminal device and the second terminal device;

and the transceiver module is used for transmitting the first RLM-RS to second terminal equipment.

23. The terminal device of claim 22,

the transceiver module is further configured to receive, before the terminal device sends the first RLM-RS to the second terminal device, first resource indication information from the first access network device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

24. The terminal device according to claim 22, comprising:

a determining module, configured to determine, before the terminal device sends a first RLM-RS to a second terminal device, a first time-frequency resource from a resource set, where the first time-frequency resource is used for sending the first RLM-RS, and resources in the resource set are used for transmitting the RLM-RS in a sidelink.

25. The terminal device of any of claims 22-24, wherein the transceiver module is further configured to receive information indicative of the set of resources from the first access network device; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

26. The terminal device of claim 24 or 25, wherein the transceiver module is further configured to, before the terminal device sends the first RLM-RS to the second terminal device,

transmitting zero-power RLM-RS resource configuration information to the second terminal equipment, wherein the zero-power RLM-RS resource configuration information is used for indicating resources used for zero-power RLM-RS, the resources of the zero-power RLM-RS belong to the resource set, and the zero-power RLM-RS is used for interference measurement;

and receiving second resource indication information from the second terminal equipment, wherein the second resource indication information is used for indicating the first time-frequency resource with smaller interference, and the smaller interference comprises the smallest interference and/or the interference smaller than a preset value.

27. The terminal device of any one of claims 22-26, wherein the transceiver module is further configured to receive first activation information from a first access network device or a second terminal device before the terminal device sends a first RLM-RS to the second terminal device, and wherein the first activation information is used to instruct the terminal device to send the RLM-RS.

28. The terminal device of any one of claims 22-27, wherein the transceiver module is further configured to receive, before the terminal device transmits the first RLM-RS to the terminal device on the first time-frequency resource, transmission indication information from a first access network device, wherein the transmission indication information indicates that the first RLM-RS is transmitted by the terminal device to the second terminal device in a radio link monitoring procedure.

29. A terminal device, comprising:

a transceiver module, configured to receive a first radio link monitoring reference signal RLM-RS from a first terminal device, where the first RLM-RS is used for monitoring a sidelink between the first terminal device and the terminal device;

a measurement module to measure the first RLM-RS.

30. The terminal device of claim 29,

the transceiver module is further configured to receive, before the terminal device receives the first RLM-RS from the first terminal device, first resource indication information from the first access network device or the first terminal device, where the first resource indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is used to send the first RLM-RS.

31. A terminal device according to claim 29 or 30, wherein the transceiver module is further configured to receive information indicative of the set of resources from the first access network device before the terminal device receives the first RLM-RS from the first terminal device; the resource set is used for transmitting RLM-RS in a sidelink, a first time-frequency resource belongs to the resource set, and the first time-frequency resource is used for transmitting the first RLM-RS.

32. The terminal device of claim 31,

the transceiver module is further configured to receive, before a terminal device receives a first RLM-RS from a first terminal device, zero-power RLM-RS resource configuration information from the first terminal device or the first access network device, where the zero-power RLM-RS resource configuration information is used to indicate resources for a reference signal with zero power, and the resources for the zero-power RLM-RS belong to the resource set, and the zero-power RLM-RS is used for interference measurement;

the measuring module is further configured to measure interference of resources of the zero-power reference signal;

the transceiver module is further configured to send second resource indication information to the first terminal device or the first access network device, where the second resource indication information is used to indicate that at least one resource with smaller interference is the first time-frequency resource, and the smaller interference includes minimum interference and/or interference smaller than a preset value.

33. The terminal device of any one of claims 29-32, wherein the transceiver module is further configured to receive first activation information from a first access network device or a first terminal device before the terminal device receives the first RLM-RS from the first terminal device, and wherein the first activation information is used to instruct the terminal device to perform measurements on the first RLM-RS.

34. The terminal device of any one of claims 29-33, wherein the transceiver module is further configured to receive first deactivation information from a first access network device or the first terminal device, wherein the first deactivation information is configured to instruct the terminal device to stop RLM-RS measurement.

35. The terminal device of any one of claims 29-34, wherein the transceiver module is further configured to send second activation information to the first terminal device before the terminal device receives the first RLM-RS from the first terminal device, and wherein the second activation information is used to instruct the first terminal device to send the first RLM-RS.

36. The terminal device of any one of claims 29-35, wherein the transceiver module is further configured to receive transmission indication information from a first access network device before the terminal device receives the first RLM-RS from the first terminal device, wherein the transmission indication information indicates that the first RLM-RS is transmitted by the first terminal device to the terminal device during a radio link monitoring procedure.

37. An access network device, comprising:

the generating module is used for generating first indication information;

the transceiver module is used for sending the first indication information to first terminal equipment;

38. A communication apparatus, characterized in that the communication apparatus comprises: at least one processor and a communication interface for the communication device to interact with other communication devices, the program instructions when executed in the at least one processor causing the communication device to perform the method of any of claims 1 to 21.

39. A computer program storage medium having program instructions which, when executed, cause the method of any one of claims 1 to 21 to be performed.

40. A chip, characterized in that the chip comprises at least one processor, which when program instructions are executed in the at least one processor causes the method according to any one of claims 1 to 21 to be performed.