WO2020177740A1 - Method and apparatus for device to device (d2d) link detection - Google Patents

Abstract

The present application provides a method and apparatus for device to device (D2D) link detection, capable of implementing link quality detection of a sidelink by obtaining resource configurations of a reference signal. The method can be applied to any one of the following scenarios: unmanned driving, self-piloting systems, advanced assisted driving, intelligent driving, connected driving, intelligent connected driving, and car-sharing. The method comprises: a receiving end obtains first indication information used for indicating configuration of a first reference signal resource, the first reference signal resource being used for transmitting a wireless link measurement reference signal, wherein the wireless link measurement reference signal is used for measuring the quality of the sidelink; and the receiving end measures the quality of the sidelink according to the first reference signal resource.

Description

Method and device for link detection in device-to-device D2D

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China, the application number is 201910172382.9, and the application name is "Method and Apparatus for Link Detection in Device-to-Device D2D" on March 7, 2019, and its entire contents Incorporated in this application by reference.

Technical field

This application relates to the field of communications, and more specifically, to a method and apparatus for link detection in device-to-device D2D.

Background technique

The Internet of Vehicles (vehicle to everything, V2X) is considered to be one of the fields with the most industrial potential and the clearest market demand in the Internet of Things system. It has the characteristics of wide application space, large industrial potential, and strong social benefits. The innovation and development of the communications industry, the construction of new models and business formats for automobiles and transportation services, the promotion of innovation and application of autonomous driving technology, and the improvement of transportation efficiency and safety are of great significance.

The 3GPP International Organization for Standardization has initiated research on V2X since LTE R14. Among them, in the V2X communication architecture, the communication link between V2X UEs is defined as a side link (SL). In vehicle-all V2X scenarios, V2X services can be directly transmitted between (user equipment, UE) through sidelinks (sidelink, SL). V2X devices can transmit data through broadcast, multicast or unicast. With the enrichment of data services, the required service quality assurance is getting higher and higher. In order to ensure the transmission quality of data services, it is necessary to track or detect the quality of the side link. At present, the specific scheme of link detection in the V2X scenario has not been clarified in the prior art.

Summary of the invention

In view of this, the present application provides a method and device for link detection in device-to-device D2D. By indicating the resource configuration of the reference signal, the link quality measurement of the side link can be implemented.

In a first aspect, a method for link detection in device-to-device D2D is provided, including: a receiving end obtains first indication information, where the first indication information is used to indicate a configuration of a first reference signal resource, and the first The reference signal resource is used to transmit the wireless link measurement reference signal, where the wireless link measurement reference signal is used to measure the quality of the side link, and the side link is the receiving end and the transmitting end in the D2D The wireless link at the end; the receiving end performs side link quality measurement according to the first reference signal resource. Therefore, the receiving end can measure the quality of the side link based on the configuration of the first reference signal resource indicated by the first indication information.

In a possible implementation manner, the method further includes: the receiving end receives a side link shared channel from the sending end; wherein, the receiving end performs side linking according to the first reference signal resource. Link quality measurement includes: if the CRC check of the side link shared channel cyclic redundancy check is correct, the receiving end determines that it is synchronized and skips the measurement of the first wireless link measurement reference signal, Wherein, the first wireless link measurement reference signal satisfies a preset condition; or, if the CRC check error on the side link shared channel is wrong, the receiving end sends an out-of-synchronization indication and skips the A measurement of a wireless link measurement reference signal; or, if the CRC check error on the side link shared channel is wrong, the receiving end measures the wireless link measurement reference signal transmitted through the first reference signal resource, and Send measurement results.

Here, the receiving end demodulates, decodes and CRC checks the shared channel of the side link. If the CRC check is correct, the receiving end can be exempt from measuring the first wireless link measurement reference signal, and the correct result of the CRC check can be used as a synchronization indication, which reduces the number of measurements. Of course, if the CRC check is wrong, the receiving end can perform measurement on the wireless link measurement reference signal transmitted through the first reference signal resource, or it can also skip the measurement of the first wireless link measurement reference signal, and the transmission is lost. Step instructions.

Optionally, that the first wireless link measurement reference signal satisfies a preset condition refers to that: the first wireless link measurement reference signal is a reference transmitted in a preset time window after the side link shared channel Signal, or, the first radio link measurement reference signal refers to a reference signal transmitted in one or more first reference signal resources that are closest to the first resource after the first resource, and the first The resource is used to receive the side link shared channel. Wherein, the reference signal transmitted in the one or more first reference signal resources closest to the first resource may be understood as: the reference signal of a preset number of times after the side link shared channel.

In a possible implementation manner, the method further includes: the receiving end receives the side link control channel from the sending end; the receiving end obtains new data to indicate NDI information, and the NDI information is used to indicate The data is newly transmitted data, or used to indicate that the data is retransmitted data; wherein, the receiving end performs sidelink quality measurement according to the first reference signal resource, including: if the NDI indicates that the data is new Data transmission, the receiving end sends a synchronization indication and skips the measurement of the second wireless link measurement reference signal, where the second wireless link measurement reference signal meets a preset condition; or, if the NDI indicates If the data is retransmitted data, the receiving end sends an out-of-synchronization indication and skips the measurement of the second reference signal resource; or, if the NDI indication data is retransmitted data, the receiving end pair passes the first The wireless link measurement reference signal transmitted by the reference signal resource performs measurement and sends the measurement result.

Here, the receiving end obtains NDI information by demodulating the side link control channel. If the NDI information indicates that the data is newly transmitted data (or understood as NDI has been reversed), then the receiving end can be exempted from measuring the measurement reference signal of the second wireless link, and the reversal of NDI can be used as a synchronization indicator, reducing the measurement frequency. Of course, if the NDI information indicates that the data is retransmitted data (or understood as NDI has not been flipped), the receiving end can perform measurement on the radio link measurement reference signal transmitted through the first reference signal resource, or it can skip the The second wireless link measures the measurement of the reference signal and sends the out-of-synchronization indication.

Optionally, that the second wireless link measurement reference signal satisfies a preset condition means that the second wireless link measurement reference signal is a reference transmitted in a preset time window after the side link control channel Signal, or, the second radio link measurement reference signal is a reference signal transmitted in one or more first reference signal resources that are closest to the second resource after the second resource, and the second resource For receiving the side link control channel. Wherein, the reference signal transmitted in the one or more first reference signal resources closest to the first resource may be understood as: a reference signal of a preset number of times after the side link control channel.

In a possible implementation manner, the method further includes: the receiving end determines that the side link fails; the receiving end sends failure information to the first device, and the failure information is used to indicate the side link When the uplink fails, the failure information includes one or more of the following information: identification information of the sending end, identification information of the services transmitted by the receiving end and the sending end, and priority information of the services. Therefore, if the side link fails, the receiving end can send failure information to the first device, so that the first device can implement data communication between the receiving end and the sending end.

Optionally, the method further includes: the receiving end transmits data to the sending end through the first device. In other words, the receiving end uses the first device to implement data transmission with the sending end.

Optionally, the transmission of data between the receiving end and the transmitting end through the first device includes: the receiving end establishes a first forwarding link with the first device, and the first The forwarding link is used to transmit data between the first device and the receiving end; the receiving end sends data to the first device through the first forwarding link; the receiving end receives the sending Data sent by the first device through the first device, wherein the first device establishes a second forwarding link with the sending end. Specifically, the receiving end can establish a first forwarding link with the first device; the sending end can establish a second forwarding link with the first device. In this way, the first device can transmit data with the receiving end through the first forwarding link, and transmit data with the sending end through the second forwarding link, which can realize data forwarding, thereby ensuring that the transmission between the sending end and the receiving end can proceed normally. .

Optionally, the first device is a network device, or a D2D device, or a roadside station unit.

In a possible implementation manner, the method further includes: the receiving end determines that the side link has recovered from failure; the receiving end sends a link release request to the first device, the The link release request is used to notify the first device to release the first forwarding link and the second forwarding link. Therefore, during the period when the first device is acting as a forwarding node, the receiving end can measure the link quality of the side link synchronously, and after measuring the recovery of the side link, it can send a link release request to the first device to avoid Occupy the communication resources of the first device.

Optionally, acquiring the first indication information by the receiving end includes: receiving the first indication information from a network device by the receiving end. In other words, the configuration of the first reference signal resource may be instructed by the network device to the receiving end.

Optionally, acquiring the first indication information by the receiving end includes: determining the first indication information by the receiving end. In other words, the configuration of the first reference signal resource may be determined by the receiving end itself.

Optionally, acquiring the first indication information by the receiving end includes: the receiving end receiving the first indication information from the sending end. That is, the configuration of the first reference signal resource may be instructed by the sending end to the receiving end.

In a possible implementation manner, the method further includes: the receiving end obtains configuration information of a resource pool, the first reference signal resource is a resource in the resource pool, and the resource pool includes at least one reference Signal resources, each of the at least one reference signal resource is used to transmit a radio link detection reference signal. That is, the receiving end may obtain the resource pool in advance, and then obtain the configuration of the first reference signal resource in the resource pool according to the first indication information.

In a second aspect, a method for link detection in device-to-device D2D is provided, including: a first device determines a configuration of a first reference signal resource, and the first reference signal resource is used to measure side link quality The side link is a wireless link between the receiving end and the transmitting end in the D2D; the first device sends first indication information, and the first indication information is used to indicate the configuration of the first reference signal resource . Therefore, the first device determines the configuration of the first reference signal resource, and then sends the first indication information to the receiving end to implement the side link measurement.

In a possible implementation manner, the method further includes: the first device receives failure information from the receiving end, the failure information is used to indicate that the side link fails, and the failure information includes One or more of the following information: identification information of the sending end, identification information of the service transmitted by the receiving end and the sending end, priority information of the service; the first device establishes a connection with the receiving end The first forwarding link is used to transmit data between the first device and the receiving end; the first device establishes a second forwarding link with the sending end A forwarding link, where the second forwarding link is used to transmit data between the first device and the sending end. Specifically, after receiving the failure information, the first device may establish a first forwarding link with the receiving end and a second forwarding link with the sending end. In this way, the first device can transmit data with the receiving end through the first forwarding link, and transmit data with the sending end through the second forwarding link, which can realize data forwarding, thereby ensuring that the transmission between the sending end and the receiving end can proceed normally. .

In a possible implementation manner, the method further includes: the first device receives a link release request from the receiving end, and the link release request is used by the first device to release the first device The established first forwarding link and the second forwarding link; the first device releases the first forwarding link; the first device releases the second forwarding link. Here, during the period when the first device is acting as a forwarding node, the receiving end can simultaneously measure the link quality of the side link, and after measuring that the side link is restored, it can send a link release request to the first device. In this way, after receiving the link release request, the first device can release corresponding resources to avoid occupying the communication resources of the first device.

Optionally, the first device is a network device, or the first device is a D2D device, or the first device is a roadside station unit RSU.

In a possible implementation manner, the first device sends configuration information of a resource pool, where the resource pool includes at least one reference signal resource, and each reference signal resource in the at least one reference signal resource is used for transmitting wireless The link detection reference signal, wherein the wireless link detection reference signal is used to measure the quality of the side link. Therefore, the first device may pre-send the configuration information of the resource pool to the receiving end or the sending end, so that the receiving end or the sending end can select the configuration of the first reference signal resource in the resource pool.

In a third aspect, a method for link detection in device-to-device D2D is provided, including: a sending end obtains first indication information, where the first indication information is used to indicate a first reference signal resource, and the first reference signal The resource is used to transmit the wireless link measurement reference signal, where the wireless link measurement reference signal is used to measure the quality of the side link, and the side link is the wireless link between the receiving end and the sending end in the D2D. Link; the sending end uses the first reference signal resource to send a wireless link detection reference signal to the receiving end. Therefore, the sending end sends the wireless link detection reference signal to the receiving end based on the configuration of the first reference signal resource indicated by the first indication information, so that the receiving end can measure the quality of the side link based on the wireless link detection reference signal .

In a possible implementation manner, the method further includes: the sending end sends a side uplink shared channel to the receiving end. The side link shared channel may be PSSCH. In this way, the transmitting end sends the PSSCH to the receiving end, so that the receiving end demodulates, decodes, and CRC check the PSSCH, thereby determining whether to measure the wireless link measurement reference signal based on the CRC check result.

In a possible implementation manner, the method further includes: the sending end sends a side link control channel to the receiving end, the side link control information carries new data indicating NDI information, and the The NDI information is used to indicate that the data is newly transmitted data, or is used to indicate that the data is retransmitted data; wherein, the sending end uses the first reference signal resource to send a radio link detection reference signal to the receiving end, Including: if the NDI information is used to indicate that the data is newly transmitted data, the sending end cancels the transmission of the wireless link measurement reference signal within a preset time window, or cancels the transmission after the side link control channel Transmission of one or more wireless link measurement reference signals; or, if the NDI information is used to indicate that the data is retransmitted data, the sending end uses the first reference signal resource to send the wireless link to the receiving end Road detection reference signal. The side link control channel may be PSCCH. In this way, the transmitting end sends the PSCCH to the receiving end, so that the receiving end demodulates the PSCCH to obtain NDI information, thereby determining whether to measure the wireless link measurement reference signal based on the content indicated by the NDI information.

Optionally, acquiring the first indication information by the sending end includes: receiving the first indication information from a network device by the sending end. In other words, the configuration of the first reference signal resource may be instructed by the network device to the sending end.

Optionally, acquiring the first indication information by the sending end includes: determining the first indication information by the sending end. In other words, the configuration of the first reference signal resource may be determined by the sending end itself.

Optionally, acquiring the first indication information by the sending end includes: the sending end receiving the first indication information from the receiving end. That is, the configuration of the first reference signal resource may be instructed by the receiving end to the sending end.

In a possible implementation, the method further includes: the sending end obtains configuration information of a resource pool, the first reference signal resource is a resource in the resource pool, and the resource pool includes at least one reference Signal resources, each of the at least one reference signal resource is used to transmit a radio link detection reference signal. That is, the receiving end may obtain the resource pool in advance, and then obtain the configuration of the first reference signal resource in the resource pool according to the first indication information.

In a fourth aspect, a communication device is provided, and the communication device includes a module for executing the foregoing first aspect or any possible implementation of the first aspect.

In a fifth aspect, a communication device is provided, and the communication device includes a module for executing the foregoing second aspect or any possible implementation of the second aspect.

In a sixth aspect, a communication device is provided, the communication device including a module for executing the foregoing third aspect or any possible implementation manner of the third aspect.

In a seventh aspect, a communication device is provided. The communication device may be a receiving end (such as a terminal device or a D2D device) in the above method design, or a chip provided in the receiving end. The communication device includes a processor, which is coupled with a memory, and can be used to execute instructions in the memory to implement the method executed by the receiving end in the first aspect and any one of its possible implementation manners. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled with the communication interface.

When the communication device is the receiving end, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip set in the receiving end, the communication interface may be an input/output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In an eighth aspect, a communication device is provided. The communication device may be the first device (such as a network device, a terminal device, or a D2D device) in the aforementioned method design, or a chip set in the first device. The communication device includes a processor, coupled with a memory, and can be used to execute instructions in the memory to implement the method executed by the first device in the first aspect and any one of its possible implementation manners. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled with the communication interface.

When the communication device is the first device, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip provided in the first device, the communication interface may be an input/output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In a ninth aspect, a communication device is provided. The communication device may be the sending end (such as a terminal device or a D2D device) in the above method design, or a chip set in the sending end. The communication device includes a processor, which is coupled to a memory, and can be used to execute instructions in the memory to implement the method executed by the sending end in the first aspect and any one of its possible implementation manners. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled with the communication interface.

When the communication device is the transmitting end, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip set in the sending end, the communication interface may be an input/output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In a tenth aspect, a program is provided, when the program is executed by a processor, it is used to execute any method in the first aspect or its possible implementation manners.

In an eleventh aspect, a program is provided, when the program is executed by a processor, it is used to execute the second aspect or any method in its possible implementation manners.

The twelfth aspect provides a program, which is used to execute any method in the third aspect or its possible implementation manners when the program is executed by a processor.

In a thirteenth aspect, a program product is provided, the program product includes: program code, when the program code is run by a communication unit, a processing unit or a transceiver, or a processor of a communication device (for example, a receiving end), The communication device is caused to execute any method in the above-mentioned first aspect and its possible implementation manners.

In a fourteenth aspect, a program product is provided, the program product includes: program code, when the program code is run by a communication unit, a processing unit or a transceiver, or a processor of a communication device (for example, a first device) , Causing the communication device to execute any method in the foregoing second aspect and possible implementation manners thereof.

In a fifteenth aspect, a program product is provided, the program product includes: program code, when the program code is run by a communication unit, a processing unit or a transceiver, or a processor of a communication device (for example, a sending end), The communication device is caused to execute any method in the foregoing second aspect and its possible implementation manners.

In a sixteenth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores a program that enables a communication device (for example, a receiving end) to execute the above-mentioned first aspect and possible implementations thereof Any method.

In a seventeenth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores a program that enables a communication device (for example, a first device) to execute the second aspect and possible implementations thereof Any method in.

In an eighteenth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores a program that enables a communication device (for example, a sending end) to execute the third aspect and its possible implementations. Any method.

Description of the drawings

Fig. 1 is an example diagram of a system architecture to which an embodiment of the present application is applied.

Fig. 2 is a schematic flowchart of a method for link detection in D2D according to an embodiment of the present application.

FIG. 3 is a schematic diagram of an example of a method for link detection in D2D according to an embodiment of the present application.

FIG. 4 is a schematic diagram of another example of applying the method for link detection in D2D according to an embodiment of the present application.

Fig. 5 is a schematic interaction diagram of a link recovery method according to an embodiment of the present application.

Fig. 6 is a schematic interaction diagram of an example of a link recovery method according to an embodiment of the present application.

Figure 7 is an architecture diagram of a multicast link scenario.

Fig. 8 is a schematic interaction diagram of another example of a link recovery method according to an embodiment of the present application.

Fig. 9 is an example diagram of data merging according to an embodiment of the present application.

Fig. 10 is a schematic block diagram of a device for link detection in D2D according to an embodiment of the present application.

FIG. 11 is a schematic structural diagram of a device for link detection in D2D according to an embodiment of the present application.

FIG. 12 is a schematic block diagram of a device for link detection in D2D according to another embodiment of the present application.

FIG. 13 is a schematic structural diagram of a device for link detection in D2D according to another embodiment of the present application.

FIG. 14 is a schematic block diagram of a device for link detection in D2D according to still another embodiment of the present application.

FIG. 15 is a schematic structural diagram of a device for link detection in D2D according to still another embodiment of the present application.

detailed description

The technical solution in this application will be described below in conjunction with the drawings.

In the description of the embodiments of the present application, unless otherwise specified, "multiple" or "multiple" means two or more.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, broadband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, the future fifth generation (5th generation, 5G) system or new radio (NR), vehicle to everything (V2X) system, device to device (D2D), etc. Optionally, the V2X system may specifically be any of the following systems: vehicle-to-network (V2N), vehicle-to-vehicle (V2V), vehicle-to-pedestrian (V2P), and Vehicle to infrastructure communication (V2I), etc.

V2N is currently the most widely used form of car networking. Its main function is to connect vehicles to a cloud server through a mobile network, thereby providing navigation, entertainment, and anti-theft functions through the cloud server.

V2V can be used as a reminder of information interaction between vehicles, and the most typical application is for anti-collision safety systems between vehicles.

V2P is used to provide safety warnings to pedestrians or non-motorized vehicles on the road.

V2I is used for communication between vehicles and infrastructure. For example, infrastructure can be roads, traffic lights, roadblocks, etc., and road management information such as traffic light signal timing can be obtained.

In the embodiment of the present application, the receiving end and the sending end in D2D may both be D2D devices, V2X devices, such as terminal devices; or, the receiving end is a terminal device, and the sending end is a network device; or, the receiving end is a network device , The sending end is terminal equipment, etc.

Taking the receiving end and the sending end as terminal devices as an example, the propagation mode between the receiving end and the sending end can be broadcast, multicast, and unicast.

The broadcast mode means that the sender uses a broadcast mode for data transmission, and all receivers can parse side link control information (SCI) and service channel information (side link shared channel, SSCH). In the side link, the way to ensure that all terminal devices can parse the control information is: the control information data is not scrambled or the known scrambling code of all terminal devices is used.

The multicast mode is similar to the broadcast mode, and also uses the broadcast mode for data transmission, and all receivers can parse SCI and SSCH.

The unicast mode is that one terminal device (such as a vehicle-mounted module) sends data to another terminal device, and other terminal devices do not need or cannot parse the data.

The terminal equipment in the embodiments of this application can refer to user equipment (UE), subscriber station (SS), customer premise equipment (CPE), access terminal, subscriber unit, subscriber station, mobile Station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device can 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), and a wireless communication Functional handheld devices, computing devices, or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., this embodiment of the present application does not limit this. The terminal device may also be a software and/or hardware module deployed in an autonomous vehicle, smart vehicle, digital vehicle, or vehicle network vehicle. The terminal equipment in the embodiments of the present application may refer to D2D equipment, V2X equipment, and roadside unit (RSU).

The network device in the embodiment of the application may be a device used to communicate with terminal devices. The network device may be a global system for mobile communications (GSM) system or code division multiple access (CDMA) The base transceiver station (BTS) in the LTE system can also be the base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, or the evolved base station (evolved) in the LTE system. NodeB, eNB or eNodeB), it can also be a wireless controller in a cloud radio access network (CRAN) scenario, or the network device can be a relay station, access point, vehicle-mounted device, wearable device, and future The network equipment (gNB) in the 5G network or the network equipment in the future evolved PLMN network, etc., are not limited in the embodiment of the present application.

In the embodiment of the present application, the terminal device or the 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 memory (also referred to as main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating system, Unix operating system, Android operating system, iOS operating system, or windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, the embodiments of the present application do not specifically limit the specific structure of the execution subject of the methods provided in the embodiments of the present application, as long as the program that records the codes of the methods provided in the embodiments of the present application can be provided according to the embodiments of the present application. For example, the execution subject of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute the program.

In addition, various aspects or features of the present application can be implemented as methods, devices, or products using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, compact discs (CD), digital versatile discs (digital versatile disc, DVD)) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). In addition, various storage media described herein may represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

Fig. 1 is an example diagram of a system architecture to which an embodiment of the present application is applied. As shown in Figure 1, the communication system includes: V2X application server, V2X equipment (including V2X equipment 1 and V2X equipment 2), and network equipment. Communication between V2X devices is realized through the PC5 interface. The communication link between V2X devices is defined as a sidelink (SL). The communication between the V2X device and the V2X application server needs to be forwarded through the network device, specifically: for the uplink, the sending end V2X device sends the V2X data to the network device through the Uu interface, and the network device sends the data to the V2X application server for processing, and then The V2X application server delivers to the receiving V2X device; for the downlink, the V2X application server sends the V2X data to the network device, and the network device sends the V2X data to the V2X device through the Uu interface.

It should be understood that the V2X device in FIG. 1 is an Internet of Things device, such as a UE.

It should also be understood that the arrow flow direction in FIG. 1 is only exemplarily described with the V2X device 1 and does not limit the embodiment of the present application. In fact, the communication between the V2X device 1 and the V2X device 2 may be bidirectional, and the V2X device 2 Device 2 can also perform uplink communication with network devices, which is not specifically limited.

At present, there is no related scheme for measuring the quality of the side uplink. In order to ensure that data can be transmitted on a high-quality data link, this application proposes a method for link detection in a D2D device to measure the quality of the side link and provide information on how the side link fails. Plan to ensure data transmission at the receiving and sending end.

The method of link detection in D2D in the embodiments of this application can be applied to any of the following scenarios: unmanned driving, automated driving system (ADS), advanced driver assistance system (ADAS) , Intelligent driving, connected driving, intelligent network driving, car sharing.

The method for link detection in D2D in an embodiment of the present application will be described below in conjunction with FIG. 2 to FIG. 9.

FIG. 2 shows a schematic flowchart of a method 200 for link detection in D2D according to an embodiment of the present application. As shown in FIG. 2, the method 200 includes:

S210. The receiving end obtains first indication information, where the first indication information is used to indicate the configuration of a first reference signal resource, and the first reference signal resource is used to transmit a radio link measurement reference signal, where the radio link The path measurement reference signal is used to measure the quality of a side-line link, and the side-line link is a wireless link between the receiving end and the transmitting end in the D2D.

Similarly, the sending end may also obtain the foregoing first indication information.

Here, the first indication information is used to indicate which reference signal resource is used to transmit the radio link measurement reference signal. For example, the first indication information may indicate the resource configuration of the first reference signal resource, and the resource configuration includes one of the following information Or multiple: resource time domain information, frequency domain information, code domain information, wireless link measurement reference signal transmission cycle, reference signal density, transmission signal power, reporting cycle (such as reporting out-of-sync indication or synchronization indication cycle) and many more. Optionally, the first reference signal resource may be a periodic resource.

In the embodiment of the present application, the wireless link measurement reference signal is a reference signal used to measure the quality of the side link, but the embodiment of the present application does not specifically limit the specific form of the wireless link measurement reference signal. For example, it may be Radio link monitoring reference signal (RLM-RS) or V2X RLM-RS, or other reference signals used to measure the quality of the side link. For example, the first reference signal resource refers to a resource used to transmit RLM-RS, and may be referred to as an RLM-RS resource.

It should be understood that the concepts "measurement process of side link" or "V2X RLM process" appearing in the following can be equivalently replaced, and both indicate that the quality of the side link is measured.

For the receiving end, the foregoing first indication information may be determined by the receiving end itself, or sent to the receiving end by a network device (for example, a base station), or sent to the receiving end by the sending end, which is not limited.

For the sending end, the above-mentioned first indication information may be determined by the sending end itself, or sent by the network device to the sending end, or sent by the receiving end to the sending end, which is not limited.

If the first indication information is sent by a network device, the network device can determine which one or more terminal devices send the wireless link measurement reference signal, and accordingly, it can determine which one or more terminal devices perform sidelink quality measuring. The advantage of direct designation of network equipment is that it avoids the overhead caused by coordination between terminal equipment. In addition, if two terminal devices send and receive data to and from each other, only a one-way link quality measurement is performed, which can reduce the amount of wireless link measurement reference signals sent and the amount of receiving calculations of the terminal device.

Taking the receiving end as an example, if the first indication information is determined by the receiving end, that is, the receiving end chooses which reference signal resource to transmit the wireless link measurement reference signal in, the receiving end can select idle resources through the energy detection method, and Send the selected resource to the sender. Optionally, the sending end may obtain multiple reference signal resources, and then send the multiple reference signal resources to the receiving end, so that the receiving end selects the best resource among the multiple reference signal resources. The advantage of this is that the receiving end can select the reference signal resource with the least interference to measure the quality of the side link.

It should be understood that if the first indication information is determined by the sender, the behavior of the sender can refer to the behavior of the receiver when "the first indication information is determined by the receiver" described above. For brevity, details are not described here.

It should also be understood that the receiving end and the sending end may be terminal devices or D2D devices, which are not specifically limited.

Optionally, before the receiving end obtains the first indication information, the receiving end may obtain configuration information of the resource pool (or referred to as a resource group), and the configuration information may include one or more for V2X side link detection Resource location. That is, the resource pool includes at least one reference signal resource, and each reference signal resource is used to transmit a radio link detection reference signal. The receiving end may select the first reference signal resource in the resource pool to measure the quality of the side link according to the first indication information. The configuration information of the resource pool may be sent by the network device in the form of broadcast, or may also be predefined by the protocol, which is not limited. The aforementioned first reference signal resource is a resource in the resource pool.

Optionally, if the resource pool is configured to be empty, the receiving end can also use the side link control channel (for example, the physical side link control channel (PSCCH)) (or called the physical side link control channel). Channel)) or a reference signal in a data channel (for example, a physical sidelink shared channel (PSSCH) (or called a physical sidelink shared channel)) as the RLM-RS for measurement and reporting.

S220: The receiving end measures the quality of the side link according to the first reference signal resource.

Here, the configuration of the first reference signal resource may include one or more first reference signal resources, such as periodic resources, and the receiving end may receive the radio link measurement reference signal at the corresponding resource position, thereby realizing the side link Quality testing.

It should be understood that the measurement process of the side link may be activated/deactivated by a network device or a terminal device, which is not limited in the embodiment of the present application. Optionally, the network equipment and terminal equipment can start the side link measurement process according to the requirements of the communication environment and service communication quality.

For example, if the sending end is marked as UE TX, UE TX can be based on the priority of the service or the transmission quality requirement level (for example, the packet priority (prose-packet priority, PPPP) threshold), or the QoS data flow identifier ( QoS flow Identity (QFI) threshold) to determine whether to start the side link measurement process. Specifically: If the current data transmission, when the QCI priority threshold of a service exceeds a certain value, the UE TX sends a message to activate side link measurement to the opposite UE; the current QCL priority of all services is lower than After a certain threshold, the UE TX sends a message to deactivate the side uplink measurement to the peer UE.

For example, the base station can close or open all or part of the side link measurement process through broadcast messages. When the side link measurement process is closed, the corresponding resources used for measurement (such as RLM -RS resources) are released, and the UE TX stops sending reference signals (such as RLM-RS signals) for measurement.

After the measurement process of the side link is started in the above manner, the receiving end can perform the measurement of the side link quality on the first reference signal resource based on the indication of the first indication information. Here, the first reference signal resource may be multiple periodic resources, and the receiving end needs to measure the radio link measurement reference signal on the corresponding resource.

Optionally, during the side link measurement process, the embodiments of the present application provide the following two methods to reduce the number of times the receiving end measures the wireless link measurement reference signal, thereby saving power consumption.

method one

If the service data received by the receiving end is decoded correctly, it can be used as a synchronization indication to reduce the number of measurements at the receiving end. This method is described in detail below.

The method 200 further includes: the sending end sends the side uplink shared channel to the receiving end. Correspondingly, the receiving end receives the side link shared channel from the sending end.

The sending end may send the radio link measurement reference signal at the corresponding resource location according to the configuration of the first reference signal resource indicated by the first indication information. For the receiving end, S220 includes: the receiving end receives the side link shared channel, data demodulation and channel decoding, and performs a CRC check. If the final CRC check is correct, the receiving end determines that it is Synchronize, and send a synchronization instruction, and skip the measurement of the first wireless link measurement reference signal, where the first wireless link measurement reference signal meets a preset condition;

Or, if the CRC check error on the side link shared channel is incorrect, the receiving end sends an out-of-synchronization indication and skips the measurement of the first reference signal resource;

Or, if the CRC check error on the side link shared channel is wrong, the receiving end measures the wireless link measurement reference signal transmitted through the first reference signal resource, and sends the measurement result.

Specifically, the receiving end receives the physical side uplink shared channel PSSCH sent by the sending end, and then demodulates, decodes, and cyclic redundancy check CRC on the PSSCH. Then, the receiving end can judge whether the side link is synchronized based on the CRC check result. If the check is correct, it can replace a measurement process as a synchronization indication, thereby reducing the amount of wireless link reference signal reception and calculations, and To calculate the power consumption.

If the CRC check is correct, the receiving end can determine that the side link is synchronized. After the synchronization is determined, the receiving end can report the synchronization indication to the higher layer. Further, the receiving end may skip the measurement of the first wireless link measurement reference signal. The first wireless link measurement reference signal refers to a type of reference signal (including one or more wireless link measurement reference signals) that meets preset conditions. For example, the first wireless link measurement reference signal is The reference signal transmitted in the preset time window after the side link shared channel, or the first radio link measurement reference signal is the first resource of the side link shared channel after receiving the first resource of the side link shared channel, and the first resource A reference signal transmitted in the most recent one or more first reference signal resources (the one or more first reference signal resources may be understood as resources used to transmit a preset number of radio link measurement reference signals). That is to say, if the CRC check is correct, the receiving end can skip the measurement of the wireless link measurement reference signal within the preset time window after the sideline link shared channel, or skip the measurement on the sideline link. A preset number of radio link measurement reference signal measurements after the channel is shared.

Optionally, the length of the preset time window or the preset number of times may be configured through higher layer signaling, such as RRC signaling, or may be broadcast through a broadcast message, or may be when a side link is established There is no limit to the setting.

If the CRC check fails, the receiving end may send an out-of-synchronization indication to the higher layer, and skip the measurement of the first wireless link measurement reference signal. Or, if the CRC check fails, the receiving end does not send an out-of-synchronization indication, but performs measurement on the wireless link measurement reference signal transmitted through the first reference signal resource, and then reports the measurement result to the higher layer.

Take the example in FIG. 3 for description. As shown in FIG. 3, A0, A1, A2, and A3 are the positions of the first reference signal resources indicated by the first indication information, and can be used to transmit V2X RLM-RS. The period of the first reference signal resource is T. The receiving end can perform a CRC check on the received PSSCH, and then determine whether the RLM-RS in the receiving window P is exempt from measurement based on the check result. As can be seen from the upper part of the figure in Figure 3, A2 is in the receiving window P. Since the CRC check is correct, the receiving end will no longer perform V2X RLM-RS reception or synchronization/out-of-synchronization evaluation on A2, which can be skipped The measurement of V2X RLM-RS transmitted on A2, and directly report the synchronization indication to the higher layer at the corresponding report time. As can be seen from the lower part of the figure in Figure 3, if the CRC check is wrong, then the receiving end needs to perform RLM-RS reception or synchronization/out-of-synchronization evaluation at the position of A2, that is, the V2X RLM- at the position of A2 The RS performs measurement and reports the measurement result (such as synchronization indication or out-of-synchronization indication) to the higher layer. In FIG. 3, an example of the first radio link measurement reference signal of the V2X RLM-RS transmitted on A2.

Therefore, the receiving end uses the correct demodulation result of the data as a synchronization indication to reduce the number of RLM-RS measurements, which can reduce calculation power consumption, thereby saving device power consumption.

Way two

In data transmission, the sender sends data multiple times to improve the correct transmission rate of data. In order to indicate whether the data is newly transmitted data or retransmitted data, new data indication (NDI) information is generally added to the scheduling information. In the current standard, whether NDI indicates a new transmission is judged by the reversal of NDI, specifically: relative to the NDI value of the previous transmission in the same HARQ process, if the NDI value of this transmission is reversed, that is, this transmission The NDI indication is different from the NDI indication during the last transmission (for example, it flips from 0 to 1 (that is, the NDI indication was 0 in the last transmission, and the NDI in this transmission is 1), or it flips from 1 to 0 (that is, the last transmission). When the NDI indication is 1, this transmission NDI is 0)), this transmission is considered to be a new transmission, if the local transmission NDI value has not been reversed (for example, from 0 to 0 (that is, the NDI indication was 0 during the last transmission) If the NDI in this transmission is still 0), or from 1 to 1 (that is, the NDI indication was 1 in the previous transmission, and the NDI in this transmission is still 1)), the transmission is considered to be a retransmission.

If the NDI indication data acquired by the receiving end is newly transmitted data (or referred to as NDI flipping), it can be used as a synchronization indication to reduce the number of measurements at the receiving end. This method is described in detail below.

The method 200 further includes: the sending end sends a side uplink control channel to the receiving end. Correspondingly, the receiving end is receiving the side link control channel from the sending end. The receiving end obtains new data indicating NDI information by demodulating and analyzing the side link control channel, and the NDI information is used to indicate that the data is newly transmitted data or is used to indicate that the data is retransmitted data.

For the transmitting end, if the NDI indicates that the data is newly transmitted data, the transmitting end cancels the transmission of the wireless link measurement reference signal within a preset time window, or cancels the transmission of the radio link measurement reference signal after the side link control channel One or more wireless link measurement reference signals (which can be understood as a preset number of wireless link measurement reference signals) are sent.

For the receiving end, S220 includes: if the NDI indication data is newly transmitted data, the receiving end sends a synchronization indication and skips the measurement of the second wireless link measurement reference signal, wherein the second wireless link The link measurement reference signal meets the preset conditions;

Or, if the NDI indication data is retransmitted data, the receiving end sends an out-of-synchronization indication, and skips the measurement of the second wireless link measurement reference signal;

Alternatively, if the NDI indicates that the data is retransmitted data, the receiving end measures the radio link measurement reference signal transmitted through the first reference signal resource, and sends the measurement result.

Specifically, the receiving end receives the PSCCH sent by the sending end, and demodulates the PSCCH to obtain NDI. The receiving end can judge whether the side link is synchronized according to the specific content of the NDI indication. If the NDI indication data is newly transmitted data, the receiving end can replace a measurement process with the new transmission indication of the NDI as a synchronization indication, that is, skip The measurement of the second wireless link measurement reference signal reduces the amount of reception and calculation of the wireless link reference signal, and reduces calculation power consumption.

In other words, if the NDI in the PSCCH is reversed (that is, indicating that the data is a newly transmitted data packet), the receiving end can determine that the side link is synchronized. The receiving end can report the synchronization indication to the higher layer. Further, the receiving end may skip the measurement of the second wireless link measurement reference signal. Wherein, the second wireless link measurement reference signal refers to a type of reference signal (including one or more wireless link measurement reference signals) that meets preset conditions, for example, the second wireless link measurement reference signal is The reference signal transmitted in the preset time window after the side link control channel, or the second radio link measurement reference signal is connected to the second resource after receiving the second resource of the side link control channel The most recent one or more first reference signal resources (the one or more first reference signal resources may be understood as resources used to transmit a preset number of radio link measurement reference signals) transmitted in the reference signal. In other words, if NDI indicates a new transmission, the receiving end can skip the measurement of the radio link measurement reference signal within a preset time window after the side link control channel, or skip the measurement of the side link control channel. A preset number of radio link measurement reference signal measurements after the channel.

Optionally, if the NDI indicates that the data is newly transmitted data, the physical layer of the receiving end reports a synchronization indication to the higher layer of the receiving end. Optionally, the physical layer of the receiving end may also report the effective time of the synchronization indication to the higher layer of the receiving end, and the effective time refers to the last data transmission time of the same HARQ process number corresponding to the newly transmitted data.

Optionally, the length of the preset time window or the preset number of times may be configured through high-layer signaling, such as RRC signaling, which is not limited.

If the NDI in the PSCCH is not inverted (that is, indicating that the data is a retransmitted packet), then the receiving end can determine that the side link is out of synchronization. The receiving end may send an out-of-synchronization indication to the higher layer, and skip the measurement of the second wireless link measurement reference signal. Or, if the NDI in the PSCCH is not overturned, the receiving end does not send an out-of-synchronization indication, but performs measurement on the second wireless link measurement reference signal, and then reports the measurement result to the higher layer.

Take the example in FIG. 4 for description. As shown in FIG. 4, A0, A1, A2, and A3 are the positions of the first reference signal resources indicated by the first indication information, which can be used to transmit V2X RLM-RS. P1 and P2 are the positions used to transmit PSCCH. The period of the first reference signal resource is T. The receiving end may demodulate the received PSCCH to obtain the NDI indication in the PSCCH, and then determine whether the V2X RLM-RS in the receiving window P is exempt from measurement based on the specific content of the NDI indication. Optionally, the receiving window P and the period T may be the same or different, which is not limited.

It can be seen from Figure 4 that at the position of P1, the receiving end receives the PSCCH and demodulates it to obtain NDI. Among them, A2 is in the receiving window P. Since the NDI indicates that the data is inverted, the receiving end no longer performs V2X RLM-RS reception or synchronization/out-of-synchronization evaluation on A2, and can skip the measurement of V2X RLM-RS transmitted on A2 and report accordingly The time is directly reported to the higher level for synchronization instructions. In FIG. 4, an example of the second radio link measurement reference signal of the V2X RLM-RS transmitted on A2.

At the position of P2, the receiving end receives the PSCCH and performs demodulation to obtain NDI. Since the NDI indicates that the data has not been flipped, the receiving end needs to perform V2X RLM-RS reception or synchronization/out-of-synchronization evaluation at the position of A2, that is, perform measurement on the V2X RLM-RS at the position A2, and the measurement result (Such as synchronization instructions or out-of-synchronization instructions) are reported to the higher level.

Therefore, the receiving end uses the NDI to indicate that the newly transmitted data is used as a synchronization indication to reduce the number of RLM-RS measurements, which can reduce computing power consumption, thereby saving device power consumption.

To sum up, in the process of measuring the quality of the side link, if the receiving end adopts the above-mentioned method one or two, it can effectively reduce the measurement of the wireless link detection reference signal and reduce the calculation power consumption.

Normally: the reception of the reference signal used to measure the quality of the side link and the evaluation of the link quality are completed at the physical layer. After completing a quality evaluation, the physical layer reports the "in-sync/out-of-sync" information to the higher layers (such as the medium access control (MAC) layer, or the RRC layer) ), the higher layer counts the information reported by the physical layer multiple times, combined with the judgment method of the prior art, and finally can give a judgment of link failure (radio link failure).

If the side link fails, the side link needs to be restored. In cellular communication, a data connection can be established with a well-linked base station through cell reselection and random access procedures, but in a side link, the V2X device cannot know which UE can send the data information required by the UE. Therefore, this application also provides a method for restoring the side link. It should be understood that the recovery method described below can be used alone or in combination with the foregoing embodiments, which is not limited in the embodiments of the present application.

FIG. 5 shows a schematic interaction diagram of a restoration method 500 according to an embodiment of the present application. As shown in FIG. 5, the method 500 includes:

S510: The receiving end determines that the side link fails;

S520: The receiving end sends failure information to the first device, where the failure information is used to indicate that the side link fails, and the failure information includes one or more of the following information: the identifier of the sending end Information, identification information (for example, service ID) of the service transmitted by the receiving end and the sending end, and priority information of the service (for example, priority identification of the service). Correspondingly, the first device receives the failure information.

Specifically, in the case where the receiving end determines that the side link fails, the failure information may be sent to the first device, so as to facilitate the forwarding of the data transmitted between the transmitting end and the transmitting end through the first device.

Optionally, the method 500 further includes: S530. The receiving end transmits data to the transmitting end through the first device.

Specifically, the data transmission between the receiving end and the sending end through the first device includes:

Establishing a first forwarding link between the receiving end and the first device, where the first forwarding link is used by the first device to receive data sent by the receiving end;

The receiving end receives the data sent by the sending end through a first device, where the first device establishes a second forwarding link with the sending end.

That is, a first forwarding link (such as a forwarding downlink) needs to be established between the receiving end and the first device, so that the first device can receive the data sent by the receiving end to the sending end. Correspondingly, a second forwarding link (for example, a forwarding uplink) needs to be established between the first device and the sending end, so that the first device can receive the data sent by the sending end to the receiving end.

While the first device is forwarding data, the receiving end can synchronously detect the quality of the side link, and once it is measured that the side link returns to the synchronized state, it can send a link release request to the first device. Optionally, the method 500 further includes:

The receiving end determines that the side link has returned to normal from failure; the receiving end sends a link release request to the first device, and the link release request is used by the first device to release the first device. The first forwarding link and the second forwarding link established by a device. Correspondingly, the first device receives the link release request, and then releases the first forwarding link and the second forwarding link according to the link release request. Among them, "return to normal" can be understood as the link returns to a synchronized state.

Optionally, as an implementation manner, if the first device receives the failure information reported by the receiving end, the first device may restore the link by adjusting the transmission power. The failure information also includes one or more of the following information: path loss information (such as path value) between the receiving end (such as the receiving end UE) and the transmitting end (such as the transmitting end UE) or other A value representing the quality of the V2X link (for example, RSRP, RSRQ or RSSI), and geographic location information of the sender. Correspondingly, after receiving the failure information, the first device (for example, the base station) may send power adjustment information to the sending end. For example, the power adjustment information includes adjusting the quality of the sending power or updating the control parameters of the sending power, thereby improving the sending end’s performance. Transmit power, improve the signal performance of the receiving end.

Optionally, as an implementation manner, if the first device receives the failure information reported by the receiving end, the first device may instruct the sending end (for example, the sending end UE) and the receiving end (for example, the receiving end UE) based on the trigger condition. ) Terminate data transmission on the side link. The trigger condition may be: the distance between the sending end and the receiving end exceeds a certain threshold, or the transmission power of the sending end exceeds a certain threshold.

Optionally, as an implementation manner, if the first device receives the failure information reported by the receiving end, the first device may reassign a new reference signal resource (for example, RLM-RS resource), and the new reference signal resource may Including: different RLM-RS resource positions on the same carrier, or RLM-RS resource positions of other carriers. Specifically, the transmitting end sends a reference signal (for example, RLM-RS) on the RLM-RS resource position of the channel, the receiving end measures the reference signal, and reports the measurement result to the first device. If the first device determines that the measurement result on the channel carrier is greater than a certain threshold, the first device instructs the receiving end and the transmitting end to establish a side link connection on the channel carrier.

Optionally, the first device may be a network device (such as a base station), a D2D device (specifically, a terminal device, or a terminal device in a specific group), or a roadside station unit. unit, RSU), this is not limited.

If the first device is a base station, the receiving end may report failure information to the base station through a physical layer control message, a medium access control control element (MAC CE), or an RRC message. Optionally, the failure information may include the identification of the data sender (such as UE-ID), service ID, service Qos (such as delay requirements, data error rate requirements) parameters, radio link layer control protocol (radio link) control, RLC) configuration parameters.

To facilitate understanding, the link recovery process in the unicast link scenario will be described in detail below with reference to the example in FIG. 6. As shown in Figure 6, the description is made by taking the first device as a base station (for example, gNB), UE1 as the receiving end, and UE2 as the sending end, including:

601: UE1 reports failure information (or forwarding link request) to the base station to request the establishment of a side-line data forwarding link.

After receiving the failure information, the base station can establish a forwarding link.

602: The base station establishes a second forwarding link.

Among them, the second forwarding link refers to the link between the data source end and the base station. The process of establishing a forwarding uplink by a base station includes: establishing a forwarding uplink according to the transmission quality requirements of "QOS Uplink"; establishing a logical channel/transmission channel of a related forwarding link and configuring parameters.

Optionally, before establishing the forwarding link, the base station needs to decompose the QOS transmission quality requirements of the side link, which can be decomposed into QOS uplink and QOS downlink. Among them, QOS uplink refers to the transmission quality on the forwarding link (ie, the second forwarding link) between UE2 and the base station, and QOS downlink refers to the transmission quality of the forwarding link (ie, the first forwarding link) between the base station and UE1. QOS requirements. Optionally, the QOS decomposed by the base station may be: uplink and downlink delay and bit error rate performance are consistent with the side link QOS performance.

603: The base station establishes the first forwarding link.

Wherein, the first forwarding link refers to the link between UE1 and the base station. The process of establishing the first forwarding link by the base station includes: establishing the forwarding downlink according to the transmission quality requirements of "QOS Downlink"; establishing the logical channel/transmission channel of the related forwarding link and configuring the parameters.

604: UE2 sends the side link data to the base station.

In other words, UE2 can send side link data to the base station through the second forwarding link, so that the base station forwards the side link data to UE1. Alternatively, the base station may forward the data sent by UE1 to UE2 through the second forwarding link.

605: The base station forwards the side link data to UE1.

Here, the base station may forward the side link data to UE1 through the first forwarding link, and may also receive data sent by UE1 to UE2.

Optionally, the resources used by the base station to forward side link data, or the scheduling resources used by the base station to communicate with UE2, can use resources in the side link resource pool, or the resources of the cellular Uu port. This is not limited.

606: UE1 performs the side link RLM-RS process.

After the base station establishes the forwarding link, UE1 can continue the measurement process of the side link, that is, measure the quality of the side link between UE1 and UE2. When the side link recovers from the failure state, the UE1 sends a forwarding link release request to request the release of the forwarding link, and the transmission of related data is switched from the Uu port forwarding to the side link transmission.

607: UE1 sends a link release request to the base station.

If UE1 detects that the side link has been restored, it sends a link release request to the base station. The link release request is used to notify the base station to release the first forwarding link and the second forwarding link.

Therefore, in this example, the base station forwards the data on the side link, which can effectively maintain the data transmission from the receiving end to the sending end, and improve the user experience.

For example, if the failure information in step 601 includes path loss information between UE1 and UE2, the base station can adjust the transmit power of UE2. Optionally, the example in FIG. 6 may also include:

608: The base station sends power adjustment information to UE2.

For example, the power adjustment information includes a control parameter for increasing the transmission power of the transmitting end, where the transmission power may include the transmission power of the RLM-RS signal, and the transmission power of the PSCCH/PSSCH.

609: The base station sends the power parameter of UE2 to UE1.

Here, the base station sends the power parameter of UE2 to UE1, so that UE1 learns the adjusted transmit power of UE2. After UE1 receives the power parameter of UE2, it can reset the power parameter in the side-link detection process, and use the new power parameter to calculate the path loss value of the side-link.

If the first device is a terminal device, the receiving end can report the out-of-sync information to the base station through a physical layer control message, MAC CE or RRC message. The out-of-synchronization information may include the UE-ID of the data sending end, the UE-ID of the receiving end, the geographic location information of the sending end UE, and the service ID.

Optionally, if the first device is a terminal device, the terminal device may be a terminal device in the same group as the receiving end and the sending end.

Optionally, if the first device is a terminal device, the terminal device can be selected according to one or more of the following judgment conditions: whether the channel between the terminal device and the receiving end is good enough (for example, the distance between the terminal device and the receiving end Is it less than a preset threshold), and whether the RSRP of the terminal device meets a certain threshold.

For ease of understanding, the link recovery process in the multicast link scenario will be described in detail below with reference to the example in FIG. 7. Figure 7 shows an architecture diagram of a multicast link scenario. As shown in Figure 7, UE3 is the data source, that is, the data sender, and simultaneously sends V2X RLM-RS, and UE1, UE2, UDE4, UE5, and UE6 are receiving UEs. If a link failure occurs between UE2 and UE3, UE1 can forward data. As shown in Figure 8, the first device is a terminal device (for example, UE1), the receiving end is UE2, and the sending end is UE3 as an example for description. The process in Figure 8 includes:

801: UE2 failed to send information.

Optionally, when UE2 finds that the side link is out of synchronization, it can broadcast failure information (or forward link request) in the group group.

802: After UE1 receives the failure information, it can establish a forwarding link. The forwarding link is the forwarding link between UE1 and UE2.

Here, data communication can be performed between UE1 and UE3, so UE1 needs to establish a forwarding link between UE1 and UE2 here.

Optionally, before establishing the forwarding link, UE1 needs to first determine whether it meets the condition of the forwarding node.

Optionally, the judgment condition may include whether the channel between UE1 and UE2 is good enough, for example, whether the distance is less than a preset threshold (for example, 100 meters), or whether the RSRP of UE1 is greater than a certain threshold.

Assuming that UE1 satisfies the condition of the forwarding node, UE1 can be used as a forwarding node to perform side link data forwarding. UE1 can respond to UE2 and send the UE ID of the forwarding node to UE2, that is, the ID of UE1.

803: UE1 receives side link data.

UE1 can receive the side link data sent by UE3. Specifically, the receiving process of sidelink data refers to that UE1 monitors the control channel sent by UE3 and performs data analysis. Among them, the control channel may include: HARQ-ID, group ID (group ID).

804: UE1 forwards the side link data.

After the forwarding link is established, UE1 can use the forwarding link established in step 802 to forward the received side link data from UE3. Specifically, the forwarding process of sidelink data refers to a process in which the UE1 forwards the received data (including the HARQ-DI of the control channel, group ID) to the UE2.

805: UE2 performs the side link measurement process.

After UE1 establishes the forwarding link, UE2 can continue the measurement process of the link between UE2 and UE3.

806: When the side link returns to normal from the failed state, UE2 sends a forwarding link release request to UE1.

After receiving the link release request, the UE1 releases the forwarding link established in step 802. The transmission of UE1 related data is switched from the UU port forwarding to the side link transmission.

Therefore, in this example, by forwarding the data on the side link by the UEs in the group, the data transmission from the receiving end to the sending end can be effectively maintained, and the user experience can be improved.

Optionally, if the forwarding link is established based on the UE, the receiving end UE may combine the data sent by the transmitting end UE and the data forwarded by the UE. Here, the example in Fig. 9 is illustrated. As shown in Fig. 9, the sending end UE3 (i.e., the data source) sends TB1 to UE2 and UE1. Because the link performance of UE2 and UE3 is relatively poor, it is difficult to correctly decode TB1 separately. Therefore, the data between UE2 and UE3 is forwarded on the link by UE1. After UE2 receives TB1 sent by UE3, it buffers the data, and when it receives TB1 forwarded by UE1, it combines the two channels of data to demodulate the data as far as possible.

In order to combine the two data channels, the signaling needs to be designed as follows: (1) When UE3 sends TB1, the HARQ-ID carried by the corresponding control channel is the same as the HARQ- carried when UE1 forwards TB1; that is, the labels are all TB1 Packet; (2) When UE1 forwards data, it needs to carry UE3's information, that is, indicate the forwarding UE3's information.

It should be understood that the examples in FIG. 3, FIG. 4, and FIG. 6 to FIG. 9 are only to facilitate those skilled in the art to understand the embodiments of the present application, and the embodiments of the present application are not limited to the specific scenarios illustrated. Those skilled in the art can obviously make various equivalent modifications or changes based on the examples in FIGS. 3, 4, and 6-9, and such modifications or changes also fall within the scope of the embodiments of the present application.

It should also be understood that the foregoing description is based on an example in which the first device is a base station or a UE. For related embodiments in which the first device is an RSU, reference may be made to the foregoing description. For brevity, details are not repeated here.

It should also be understood that the various solutions of the embodiments of the present application can be used in a reasonable combination, and the explanations or descriptions of various terms appearing in the embodiments can be referred to or explained in the various embodiments, which is not limited.

It should also be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not be implemented in this application. The implementation process of the example constitutes any limitation.

The method for link detection in D2D according to the embodiments of the present application is described in detail above with reference to FIGS. 1 to 9. The apparatus of the method for link detection in D2D according to an embodiment of the present application will be described below in conjunction with FIG. 10 to FIG. 15. It should be understood that the technical features described in the method embodiments are also applicable to the following device embodiments.

FIG. 10 shows a schematic block diagram of an apparatus 1000 of a method for link detection in D2D according to an embodiment of the present application. The device 1000 is configured to execute the method executed by the receiving end in the foregoing method embodiment. Optionally, the specific form of the device 1000 may be a receiving end or a chip in the receiving end. Optionally, the receiving end may be a terminal device or a roadside station unit RSU. The embodiments of this application do not limit this. The device 1000 includes:

The transceiver module 1010 is configured to obtain first indication information, where the first indication information is used to indicate the configuration of a first reference signal resource, and the first reference signal resource is used to transmit a radio link measurement reference signal, wherein the The wireless link measurement reference signal is used to measure the quality of a side link, where the side link is a wireless link between the receiving end and the transmitting end in the D2D;

The processing module 1020 is configured to perform sidelink quality measurement according to the first reference signal resource.

In a possible implementation manner, the transceiver module 1010 is further configured to:

Receiving the side link shared channel from the sending end;

Correspondingly, the processing module 1020 is configured to perform sidelink quality measurement according to the first reference signal resource, which specifically includes:

If the CRC check of the side link shared channel is correct, it is determined to be synchronized, and the measurement of the first wireless link measurement reference signal is skipped, wherein the first wireless link measurement reference signal meets the preset condition ；

Or, if the CRC check error on the side link shared channel is wrong, call the transceiver module 1010 to send an out-of-synchronization indication, and skip the measurement of the first wireless link measurement reference signal;

Or, if the CRC check error on the side link shared channel is wrong, the wireless link measurement reference signal transmitted through the first reference signal resource is measured, and the transceiver module 1010 is called to send the measurement result.

Optionally, that the first wireless link measurement reference signal satisfies a preset condition refers to that: the first wireless link measurement reference signal is a reference transmitted in a preset time window after the side link shared channel signal,

Alternatively, the first radio link measurement reference signal refers to a reference signal transmitted in one or more first reference signal resources that are closest to the first resource after the first resource, and the first resource is used To receive the side link shared channel.

In a possible implementation manner, the transceiver module 1010 is further configured to:

Receiving the side link control channel from the sending end;

The processing module 1020 is further configured to obtain new data indicating NDI information, where the NDI information is used to indicate that the data is newly transmitted data, or used to indicate that the data is retransmitted data;

Correspondingly, the processing module 1020 is configured to perform sidelink quality measurement according to the first reference signal resource, which specifically includes:

If the NDI indicates that the data is newly transmitted data, call the transceiver module 1010 to send a synchronization instruction, and skip the measurement of the second wireless link measurement reference signal, where the second wireless link measurement reference signal meets the predetermined Set conditions

Or, if the NDI indicates that the data is retransmitted data, call the transceiver module 1010 to send an out-of-synchronization indication, and skip the measurement of the second reference signal resource;

Or, if the NDI indicates that the data is retransmitted data, measure the radio link measurement reference signal transmitted through the first reference signal resource, and send the measurement result.

Optionally, that the second wireless link measurement reference signal satisfies a preset condition means that the second wireless link measurement reference signal is a reference transmitted in a preset time window after the side link control channel signal,

Alternatively, the second radio link measurement reference signal is a reference signal transmitted in one or more first reference signal resources that are closest to the second resource after the second resource, and the second resource is used for Receiving the side link control channel.

In a possible implementation manner, the processing module 1020 is further configured to: determine that the side link fails;

The transceiver module 1010 is further configured to send failure information to the first device, where the failure information is used to indicate that the side link fails, and the failure information includes one or more of the following information: The identification information of the sending end, the identification information of the service transmitted by the receiving end and the sending end, and the priority information of the service.

In a possible implementation manner, the transceiver module 1010 is further configured to: transmit data to the sending end through the first device.

In a possible implementation, the transceiving module 1010 is configured to transmit data to the sending end through the first device, which specifically includes:

Establishing a first forwarding link with the first device, where the first forwarding link is used to transmit data between the first device and the receiving end;

Sending data to the first device through the first forwarding link;

Receiving data sent by the sending end through a first device, where the first device and the sending end have established a second forwarding link.

In a possible implementation manner, the processing module 1020 is further configured to:

Determining that the side link has recovered from failure;

Correspondingly, the transceiver module 1010 is further configured to send a link release request to the first device, and the link release request is used to notify the first device to release the first forwarding link and the first forwarding link. 2. Forwarding link.

Optionally, the first device is a network device, or a D2D device, or a roadside station unit.

Optionally, that the transceiver module 1010 is configured to obtain the first indication information specifically includes: receiving the first indication information from a network device.

Optionally, that the transceiver module 1010 is configured to obtain the first indication information specifically includes: receiving the first indication information from the sending end.

Optionally, the transceiver module 1010 is further configured to obtain configuration information of a resource pool, the first reference signal resource is a resource in the resource pool, the resource pool includes at least one reference signal resource, and the at least Each reference signal resource in one reference signal resource is used to transmit a radio link detection reference signal.

It should be understood that the device 1000 of the method for link detection in D2D according to the embodiment of the present application may correspond to the method of the receiving end in the foregoing method embodiment, for example, the method of the receiving end in FIG. 2 or FIG. 5, and each module in the device 1000 The foregoing and other management operations and/or functions are respectively intended to implement the corresponding steps of the receiving end method in the foregoing method embodiment, and therefore, the beneficial effects in the foregoing method embodiment can also be achieved. For brevity, details are not described here.

It should also be understood that each module in the device 1000 can be implemented in the form of software and/or hardware, which is not specifically limited. In other words, the device 1000 is presented in the form of functional modules. The "module" here may refer to application-specific integrated circuits ASIC, circuits, processors and memories that execute one or more software or firmware programs, integrated logic circuits, and/or other devices that can provide the above-mentioned functions. Optionally, in a simple embodiment, those skilled in the art can imagine that the device 1000 may adopt the form shown in FIG. 11. The processing module 1020 may be implemented by the processor 1101 shown in FIG. 11. The transceiver module 1010 may be implemented by the transceiver 1103 shown in FIG. 11. Specifically, the processor is implemented by executing a computer program stored in the memory. Optionally, when the device 1000 is a chip, the function and/or implementation process of the transceiver module 1010 may also be implemented through pins or circuits. Optionally, the memory is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the computer device, as shown in FIG. 11 1102.

FIG. 11 shows a schematic structural diagram of an apparatus 1100 of a method for link detection in D2D according to an embodiment of the present application. Optionally, the apparatus 1100 may be a terminal device or a roadside station unit RSU. As shown in FIG. 11, the apparatus 1100 includes: a processor 1101.

In a possible implementation manner, the processor 1101 is configured to call an interface to perform the following actions: obtain first indication information, where the first indication information is used to indicate the configuration of a first reference signal resource, and the first reference The signal resource is used to transmit the wireless link measurement reference signal, where the wireless link measurement reference signal is used to measure the quality of the side link, and the side link is the difference between the receiving end and the sending end in the D2D Wireless link; the processor 1101 is further configured to perform side link quality measurement according to the first reference signal resource.

It should be understood that the processor 1101 may call an interface to perform the above-mentioned transceiving action, where the called interface may be a logical interface or a physical interface, which is not limited. Optionally, the physical interface can be implemented by a transceiver. Optionally, the device 1100 further includes a transceiver 1103.

Optionally, the device 1100 further includes a memory 1102, and the memory 1102 can store the program codes in the foregoing method embodiments, so that the processor 1101 can call them.

Specifically, if the device 1100 includes the processor 1101, the memory 1102, and the transceiver 1103, the processor 1101, the memory 1102, and the transceiver 1103 communicate with each other through internal connection paths, and transfer control and/or data signals. In a possible design, the processor 1101, the memory 1102, and the transceiver 1103 may be implemented by chips. The processor 1101, the memory 1102, and the transceiver 1103 may be implemented on the same chip or may be implemented on different chips. Or any combination of two functions can be implemented in one chip. The memory 1102 may store program codes, and the processor 1101 calls the program codes stored in the memory 1102 to implement corresponding functions of the apparatus 1100.

It should be understood that the apparatus 1100 may also be used to perform other steps and/or operations on the receiving end side in the foregoing embodiment, and for the sake of brevity, details are not described here.

FIG. 12 shows a schematic block diagram of an apparatus 1200 of a method for link detection in D2D according to an embodiment of the present application. The device 1200 is configured to execute the method executed by the sending end in the foregoing method embodiment. Optionally, the specific form of the apparatus 1200 may be a sending end or a chip in the sending end. Optionally, the sending end may be a terminal device or a roadside station unit RSU. The embodiments of this application do not limit this. The device 1200 includes:

The transceiver module 1210 is configured to obtain first indication information, where the first indication information is used to indicate a first reference signal resource, and the first reference signal resource is used to transmit a wireless link measurement reference signal, wherein the wireless link The path measurement reference signal is used to measure the quality of the side-link, where the side-link is the wireless link between the receiving end and the transmitting end in the D2D;

The transceiver module 1210 is further configured to use the first reference signal resource to send a wireless link detection reference signal to the receiving end.

In a possible implementation manner, the transceiver module 1210 is further configured to send a side uplink shared channel to the receiving end.

In a possible implementation, the transceiver module 1210 is further configured to send a side link control channel to the receiving end, and the side link control information carries new data indicating NDI information, and the NDI Information is used to indicate that the data is newly transmitted data, or used to indicate that the data is retransmitted data;

Wherein, the transceiver module 1210 is configured to use the first reference signal resource to send a wireless link detection reference signal to the receiving end, which specifically includes:

If the NDI information is used to indicate that the data is newly transmitted data, cancel the transmission of the wireless link measurement reference signal within the preset time window, or cancel one or more wireless links after the side link control channel Channel measurement reference signal transmission;

Alternatively, if the NDI information is used to indicate that the data is retransmitted data, the first reference signal resource is used to send a radio link detection reference signal to the receiving end.

Optionally, that the transceiver module 1210 is configured to obtain the first indication information specifically includes: receiving the first indication information from a network device.

Optionally, that the transceiver module 1210 is configured to obtain the first indication information specifically includes: receiving the first indication information from the receiving end.

Optionally, the transceiver module 1210 is further configured to obtain configuration information of a resource pool, the first reference signal resource is a resource in the resource pool, the resource pool includes at least one reference signal resource, and the at least Each reference signal resource in one reference signal resource is used to transmit a radio link detection reference signal.

It should be understood that the device 1200 of the method for link detection in D2D according to the embodiment of the present application may correspond to the method of the sending end in the foregoing method embodiment, and the above and other management operations and/or functions of each module in the device 1200 are respectively for The corresponding steps of the method at the sending end in the foregoing method embodiment are implemented, and therefore, the beneficial effects in the foregoing method embodiment can also be achieved. For brevity, details are not described here.

It should also be understood that each module in the device 1200 can be implemented in the form of software and/or hardware, which is not specifically limited. In other words, the apparatus 1200 is presented in the form of functional modules. The "module" here may refer to application-specific integrated circuits ASIC, circuits, processors and memories that execute one or more software or firmware programs, integrated logic circuits, and/or other devices that can provide the above-mentioned functions. Optionally, in a simple embodiment, those skilled in the art can imagine that the apparatus 1200 may adopt the form shown in FIG. 13. The transceiver module 1210 may be implemented by the transceiver 1303 shown in FIG. 13. Specifically, the processor is implemented by executing a computer program stored in the memory. Optionally, when the device 1200 is a chip, the function and/or implementation process of the transceiver module 1210 can also be implemented through pins or circuits. Optionally, the memory is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the computer device, such as the memory shown in FIG. 13 1302.

FIG. 13 shows a schematic structural diagram of an apparatus 1300 of a method for link detection in D2D according to an embodiment of the present application. Optionally, the apparatus 1300 may be a terminal device or a roadside station unit RSU. As shown in FIG. 13, the apparatus 1300 includes: a processor 1301.

In a possible implementation manner, the processor 1301 is configured to call an interface to perform the following actions: obtain first indication information, where the first indication information is used to indicate a first reference signal resource, and the first reference signal resource Used to transmit a wireless link measurement reference signal, where the wireless link measurement reference signal is used to measure the quality of a side link, and the side link is a wireless link between the receiving end and the transmitting end in the D2D Way; using the first reference signal resource to send a wireless link detection reference signal to the receiving end.

It should be understood that the processor 1301 may call an interface to perform the above-mentioned transceiving action, where the called interface may be a logical interface or a physical interface, which is not limited. Optionally, the physical interface can be implemented by a transceiver. Optionally, the device 1300 further includes a transceiver 1303.

Optionally, the device 1300 further includes a memory 1302, and the memory 1302 may store the program code in the foregoing method embodiment, so that the processor 1301 can call it.

Specifically, if the device 1300 includes the processor 1301, the memory 1302, and the transceiver 1303, the processor 1301, the memory 1302, and the transceiver 1303 communicate with each other through internal connection paths, and transfer control and/or data signals. In a possible design, the processor 1301, the memory 1302, and the transceiver 1303 may be implemented by chips. The processor 1301, the memory 1302, and the transceiver 1303 may be implemented on the same chip or may be implemented on different chips. Or any combination of two functions can be implemented in one chip. The memory 1302 may store program codes, and the processor 1301 calls the program codes stored in the memory 1302 to implement corresponding functions of the apparatus 1300.

It should be understood that the apparatus 1300 may also be used to perform other steps and/or operations on the sending end side in the foregoing embodiment, and for the sake of brevity, details are not described here.

FIG. 14 shows a schematic block diagram of an apparatus 1400 of a method for link detection in D2D according to an embodiment of the present application. The device 1400 is used to execute the method executed by the first device in the foregoing method embodiment. Optionally, the specific form of the apparatus 1400 may be the first device or a chip in the first device. Optionally, the first device may be a terminal device, a network device, or a roadside station unit RSU. The embodiments of this application do not limit this. The device 1400 includes:

The processing module 1410 is configured to determine the configuration of the first reference signal resource, where the first reference signal resource is used to measure the quality of the side-link, and the side-link is the wireless connection between the receiving end and the transmitting end in the D2D. link;

The transceiver module 1420 is configured to send first indication information, where the first indication information is used to indicate the configuration of the first reference signal resource.

In a possible implementation manner, the transceiver module 1420 is further configured to:

Receiving failure information from the receiving end, where the failure information is used to indicate that the side link has failed, and the failure information includes one or more of the following information: identification information of the transmitting end, the receiving Identification information of the service transmitted between the terminal and the sending terminal, and priority information of the service;

Correspondingly, the processing module 1410 is further configured to: establish a first forwarding link with the receiving end, and the first forwarding link is used to transmit the communication between the first device and the receiving end. Data; establishing a second forwarding link with the sending end, where the second forwarding link is used to transmit data between the first device and the sending end.

In a possible implementation manner, the transceiver module 1420 is further configured to:

Receiving a link release request from the receiving end, where the link release request is used by the first device to release the first forwarding link and the second forwarding link established by the first device;

Correspondingly, the processing module 1410 is further configured to: release the first forwarding link; and release the second forwarding link.

It should be understood that the device 1400 of the method for link detection in D2D according to the embodiment of the present application may correspond to the method of the first device in the foregoing method embodiment, for example, the method in FIG. 5, and the above-mentioned of each module in the device 1400 The other management operations and/or functions are used to implement the corresponding steps of the method of the first device in the foregoing method embodiment, so that the beneficial effects in the foregoing method embodiment can also be achieved. For brevity, details are not described here.

It should also be understood that each module in the device 1400 can be implemented in the form of software and/or hardware, which is not specifically limited. In other words, the apparatus 1400 is presented in the form of functional modules. The "module" here may refer to application-specific integrated circuits ASIC, circuits, processors and memories that execute one or more software or firmware programs, integrated logic circuits, and/or other devices that can provide the above-mentioned functions. Optionally, in a simple embodiment, those skilled in the art can imagine that the device 1400 may adopt the form shown in FIG. 15. The processing module 1410 may be implemented by the processor 1501 shown in FIG. 15. The transceiver module 1420 may be implemented by the transceiver 1503 shown in FIG. 15. Specifically, the processor is implemented by executing a computer program stored in the memory. Optionally, when the device 1400 is a chip, the function and/or implementation process of the transceiver module 1420 may also be implemented by pins or circuits. Optionally, the memory is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the computer device, as shown in FIG. 15 1502.

FIG. 15 shows a schematic structural diagram of an apparatus 1500 of a method for link detection in D2D according to an embodiment of the present application. Optionally, the apparatus 1500 may be a terminal device, a network device, or a roadside station unit RSU. As shown in FIG. 15, the apparatus 1500 includes a processor 1501.

In a possible implementation manner, the processor 1501 is configured to determine the configuration of a first reference signal resource, the first reference signal resource is used to measure the quality of a side link, and the side link is The wireless link between the receiving end and the transmitting end in the D2D; the processor 1501 is configured to call an interface to perform the following actions: send first indication information, where the first indication information is used to indicate the configuration of the first reference signal resource .

It should be understood that the processor 1501 may call an interface to perform the above-mentioned transceiving action, where the called interface may be a logical interface or a physical interface, which is not limited. Optionally, the physical interface can be implemented by a transceiver. Optionally, the device 1500 further includes a transceiver 1503.

Optionally, the device 1500 further includes a memory 1502, and the memory 1502 can store the program code in the foregoing method embodiment, so that the processor 1501 can call it.

Specifically, if the device 1500 includes the processor 1501, the memory 1502, and the transceiver 1503, the processor 1501, the memory 1502, and the transceiver 1503 communicate with each other through internal connection paths, and transfer control and/or data signals. In a possible design, the processor 1501, the memory 1502, and the transceiver 1503 may be implemented by chips. The processor 1501, the memory 1502, and the transceiver 1503 may be implemented on the same chip or may be implemented on different chips. Or any combination of two functions can be implemented in one chip. The memory 1502 may store program codes, and the processor 1501 calls the program codes stored in the memory 1502 to implement corresponding functions of the apparatus 1500.

It should be understood that the apparatus 1500 may also be used to perform other steps and/or operations on the first device side in the foregoing embodiment, and for the sake of brevity, details are not described here.

The methods disclosed in the above embodiments of the present application may be applied to a processor or implemented by a processor. The processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software. The aforementioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components can also be system on chip (SoC), central processor unit (CPU), or network processor (network processor). processor, NP), can also be a digital signal processing circuit (digital signal processor, DSP), can also be a microcontroller (microcontroller unit, MCU), can also be a programmable controller (programmable logic device, PLD) or other Integrated chip. The methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (synchlink DRAM, SLDRAM) ) And direct memory bus random access memory (direct rambus RAM, DR RAM). It should be noted that the memories of the systems and methods described herein are intended to include, but are not limited to, these and any other suitable types of memories.

It should be understood that in the embodiments of the present invention, the numbers "first", "second"... are only used to distinguish different objects, for example, to distinguish different resources, and do not limit the scope of the embodiments of the present application. Not limited to this.

It should also be understood that for some terms or concepts (such as synchronization indication, out-of-synchronization indication, etc.) appearing in the embodiments of the present application, those skilled in the art can also refer to the description in the prior art, and the embodiments of the present application will not repeat them.

It should also be understood that the term "and/or" in this text is only an association relationship describing associated objects, indicating that three relationships can exist. For example, A and/or B can mean that A alone exists, and both A and B, there are three cases of B alone. In addition, the character "/" in this text generally indicates that the associated objects before and after are in an "or" relationship.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

In this application, similar to the meaning of "item includes one or more of the following: A, B, and C", unless otherwise specified, it usually means that the item can be any of the following: A; B ; C; A and B; A and C; B and C; A, B and C; A and A; A, A and A; A, A and B; A, A and C, A, B and B; A , C and C; B and B, B, B and B, B, B and C, C and C; C, C and C, and other combinations of A, B and C. The above is an example of three elements A, B and C to illustrate the optional items of the item. When expressed as "the item includes at least one of the following: A, B,..., and X", it means When there are more elements, then the applicable items of the item can also be obtained according to the aforementioned rules.

A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

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

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (30)

A method for link detection in device-to-device D2D, characterized in that it includes: The receiving end obtains first indication information, where the first indication information is used to indicate the configuration of a first reference signal resource, and the first reference signal resource is used to transmit a radio link measurement reference signal, wherein the radio link measurement The reference signal is used to measure the quality of the side link, where the side link is a wireless link between the receiving end and the transmitting end in the D2D; The receiving end performs sidelink quality measurement according to the first reference signal resource. The method of claim 1, wherein the method further comprises: The receiving end receives the side link shared channel from the sending end; Wherein, the receiving end performing sidelink quality measurement according to the first reference signal resource includes: If the CRC check of the side link shared channel cyclic redundancy check is correct, the receiving end determines that it is synchronized and skips the measurement of the first wireless link measurement reference signal, wherein the first wireless link The link measurement reference signal meets the preset conditions; Or, if the CRC check error on the side link shared channel is wrong, the receiving end sends an out-of-synchronization indication and skips the measurement of the first wireless link measurement reference signal; Or, if the CRC check error on the side link shared channel is wrong, the receiving end measures the wireless link measurement reference signal transmitted through the first reference signal resource, and sends the measurement result. The method according to claim 2, wherein the first wireless link measurement reference signal meeting a preset condition means that: the first wireless link measurement reference signal is a shared channel on the side link The reference signal transmitted in the preset time window, Alternatively, the first radio link measurement reference signal refers to a reference signal transmitted in one or more first reference signal resources that are closest to the first resource after the first resource, and the first resource is used To receive the side link shared channel. The method of claim 1, wherein the method further comprises: The receiving end receives the side link control channel from the sending end; The receiving end acquires new data indicating NDI information, where the NDI information is used to indicate that the data is newly transmitted data, or is used to indicate that the data is retransmitted data; Wherein, the receiving end performing sidelink quality measurement according to the first reference signal resource includes: If the NDI indication data is newly transmitted data, the receiving end sends a synchronization indication and skips the measurement of the second wireless link measurement reference signal, where the second wireless link measurement reference signal satisfies a preset condition ； Or, if the NDI indicates that the data is retransmitted data, the receiving end sends an out-of-synchronization indication and skips the measurement of the second reference signal resource; Alternatively, if the NDI indicates that the data is retransmitted data, the receiving end measures the radio link measurement reference signal transmitted through the first reference signal resource, and sends the measurement result. The method according to claim 4, wherein the second wireless link measurement reference signal meeting a preset condition means that: the second wireless link measurement reference signal is in the side link control channel The reference signal transmitted in the preset time window, Alternatively, the second radio link measurement reference signal is a reference signal transmitted in one or more first reference signal resources that are closest to the second resource after the second resource, and the second resource is used for Receiving the side link control channel. The method according to any one of claims 1 to 5, wherein the method further comprises: The receiving end determines that the side link fails; The receiving end sends failure information to the first device, where the failure information is used to indicate that the side link fails, and the failure information includes one or more of the following information: identification information of the sending end, Identification information of the service transmitted by the receiving end and the sending end, and priority information of the service. The method according to claim 6, wherein the method further comprises: The receiving end transmits data to the sending end through the first device. 8. The method according to claim 7, wherein the transmitting of data between the receiving end and the transmitting end through the first device comprises: Establishing a first forwarding link between the receiving end and the first device, where the first forwarding link is used to transmit data between the first device and the receiving end; The receiving end sends data to the first device through the first forwarding link; The receiving end receives the data sent by the sending end through a first device, where the first device establishes a second forwarding link with the sending end. The method according to any one of claims 6 to 8, wherein the method further comprises: The receiving end determines that the side link has recovered from failure; The receiving end sends a link release request to the first device, where the link release request is used to notify the first device to release the first forwarding link and the second forwarding link. A method for link detection in device-to-device D2D, characterized in that it includes: The sending end obtains first indication information, where the first indication information is used to indicate a first reference signal resource, and the first reference signal resource is used to transmit a radio link measurement reference signal, wherein the radio link measurement reference signal Used to measure the quality of a side link, where the side link is a wireless link between the receiving end and the sending end in the D2D; The sending end uses the first reference signal resource to send a radio link detection reference signal to the receiving end. The method according to claim 10, wherein the method further comprises: The sending end sends a side link shared channel to the receiving end. The method according to claim 10, wherein the method further comprises: The sending end sends a side link control channel to the receiving end, and the side link control information carries new data indicating NDI information, and the NDI information is used to indicate that the data is newly transmitted data, or for Indicates that the data is retransmitted data; Wherein, the sending end using the first reference signal resource to send a radio link detection reference signal to the receiving end includes: If the NDI information is used to indicate that the data is newly transmitted data, the sending end cancels the transmission of the wireless link measurement reference signal within a preset time window, or cancels one or the following after the side link control channel Transmission of multiple wireless link measurement reference signals; Alternatively, if the NDI information is used to indicate that the data is retransmitted data, the sending end uses the first reference signal resource to send a radio link detection reference signal to the receiving end. A method for link detection in device-to-device D2D, characterized in that it includes: The first device determines a configuration of a first reference signal resource, where the first reference signal resource is used to measure the quality of a sideline link, and the sideline link is a wireless link between a receiving end and a transmitting end in the D2D; The first device sends first indication information, where the first indication information is used to indicate the configuration of the first reference signal resource. The method of claim 13, wherein the method further comprises: The first device receives failure information from the receiving end, where the failure information is used to indicate that the side link has failed, and the failure information includes one or more of the following information: the identifier of the transmitting end Information, identification information of the service transmitted by the receiving end and the sending end, and priority information of the service; Establishing a first forwarding link between the first device and the receiving end, where the first forwarding link is used to transmit data between the first device and the receiving end; The first device establishes a second forwarding link with the sending end, and the second forwarding link is used to transmit data between the first device and the sending end. The method of claim 14, wherein the method further comprises: The first device receives a link release request from the receiving end, and the link release request is used by the first device to release the first forwarding link and the second forwarding established by the first device link; Releasing the first forwarding link by the first device; The first device releases the second forwarding link. A device for device-to-device D2D link detection, which is characterized in that it comprises: The transceiver module is configured to obtain first indication information, where the first indication information is used to indicate the configuration of a first reference signal resource, and the first reference signal resource is used to transmit a radio link measurement reference signal. The link measurement reference signal is used to measure the quality of the side link, where the side link is a wireless link between the receiving end and the sending end in the D2D; The processing module is further configured to perform sidelink quality measurement according to the first reference signal resource. The device according to claim 16, wherein the transceiver module is further configured to: Receiving the side link shared channel from the sending end; Correspondingly, the processing module is configured to perform sidelink quality measurement according to the first reference signal resource, which specifically includes: If the CRC of the side link shared channel cyclic redundancy check is correct, it is determined to be synchronized, and the measurement of the first wireless link measurement reference signal is skipped, wherein the first wireless link measurement reference The signal meets the preset conditions; Or, if the CRC check error on the side link shared channel is wrong, call the transceiver module to send an out-of-synchronization indication, and skip the measurement of the first wireless link measurement reference signal; Or, if the CRC check error on the side link shared channel is wrong, measure the wireless link measurement reference signal transmitted through the first reference signal resource, and call the transceiver module to send the measurement result. The apparatus according to claim 17, wherein the first wireless link measurement reference signal meeting a preset condition means that: the first wireless link measurement reference signal is a shared channel on the side link The reference signal transmitted in the preset time window, Alternatively, the first radio link measurement reference signal refers to a reference signal transmitted in one or more first reference signal resources that are closest to the first resource after the first resource, and the first resource is used To receive the side link shared channel. The device according to claim 16, wherein the transceiver module is further configured to: Receiving the side link control channel from the sending end; The processing module is further configured to obtain new data indicating NDI information, where the NDI information is used to indicate that the data is newly transmitted data, or used to indicate that the data is retransmitted data; Correspondingly, the processing module is configured to perform sidelink quality measurement according to the first reference signal resource, which specifically includes: If the NDI indicates that the data is newly transmitted data, call the transceiver module to send a synchronization instruction, and skip the measurement of the second wireless link measurement reference signal, where the second wireless link measurement reference signal satisfies the preset condition; Or, if the NDI indicates that the data is retransmitted data, call the transceiver module to send an out-of-synchronization indication, and skip the measurement of the second reference signal resource; Or, if the NDI indicates that the data is retransmitted data, measure the radio link measurement reference signal transmitted through the first reference signal resource, and send the measurement result. The apparatus according to claim 19, wherein the second wireless link measurement reference signal meeting a preset condition means that: the second wireless link measurement reference signal is in the side link control channel The reference signal transmitted in the preset time window, Alternatively, the second radio link measurement reference signal is a reference signal transmitted in one or more first reference signal resources that are closest to the second resource after the second resource, and the second resource is used for Receiving the side link control channel. The device according to any one of claims 16 to 20, wherein the processing module is further configured to: determine that the side link fails; The transceiver module is further configured to send failure information to the first device, where the failure information is used to indicate that the side link fails, and the failure information includes one or more of the following information: Identification information, identification information of the service transmitted by the receiving end and the sending end, and priority information of the service. The apparatus according to claim 21, wherein the transceiver module is further configured to: transmit data to the sending end through the first device. The apparatus according to claim 22, wherein the transceiver module is configured to transmit data to the sending end through the first device, and specifically comprises: Establishing a first forwarding link with the first device, where the first forwarding link is used to transmit data between the first device and the receiving end; Sending data to the first device through the first forwarding link; Receiving data sent by the sending end through a first device, where the first device and the sending end have established a second forwarding link. The device according to any one of claims 21 to 23, wherein the processing module is further configured to: Determining that the side link has recovered from failure; Correspondingly, the transceiver module is further configured to: send a link release request to the first device, and the link release request is used to notify the first device to release the first forwarding link and the second forwarding link. Forwarding link. A device for device-to-device D2D link detection, which is characterized in that it comprises: The transceiver module is configured to obtain first indication information, where the first indication information is used to indicate a first reference signal resource, and the first reference signal resource is used to transmit a radio link measurement reference signal, wherein the radio link The measurement reference signal is used to measure the quality of a side link, where the side link is a wireless link between the receiving end and the transmitting end in the D2D; The transceiver module is further configured to use the first reference signal resource to send a wireless link detection reference signal to the receiving end. The apparatus according to claim 25, wherein the transceiver module is further configured to send a side uplink shared channel to the receiving end. The device according to claim 25, wherein the transceiver module is further configured to: send a side link control channel to the receiving end, and the side link control information carries new data indicating NDI information, The NDI information is used to indicate that the data is newly transmitted data, or used to indicate that the data is retransmitted data; Wherein, the transceiver module is configured to use the first reference signal resource to send a wireless link detection reference signal to the receiving end, which specifically includes: If the NDI information is used to indicate that the data is newly transmitted data, cancel the transmission of the wireless link measurement reference signal within the preset time window, or cancel one or more wireless links after the side link control channel Channel measurement reference signal transmission; Alternatively, if the NDI information is used to indicate that the data is retransmitted data, the first reference signal resource is used to send a radio link detection reference signal to the receiving end. A device for device-to-device D2D link detection, which is characterized in that it comprises: The processing module is configured to determine the configuration of the first reference signal resource, the first reference signal resource is used to measure the quality of the side-link, the side-link is the wireless link between the receiving end and the transmitting end in the D2D road; The transceiver module is configured to send first indication information, where the first indication information is used to indicate the configuration of the first reference signal resource. The device according to claim 28, wherein the transceiver module is further configured to: Receiving failure information from the receiving end, where the failure information is used to indicate that the side link has failed, and the failure information includes one or more of the following information: identification information of the transmitting end, the receiving Identification information of the service transmitted between the terminal and the sending terminal, and priority information of the service; Correspondingly, the processing module is further configured to: establish a first forwarding link with the receiving end, and the first forwarding link is used to transmit data between the first device and the receiving end Establish a second forwarding link with the sending end, where the second forwarding link is used to transmit data between the first device and the sending end. The device according to claim 29, wherein the transceiver module is further configured to: Receiving a link release request from the receiving end, where the link release request is used by the first device to release the first forwarding link and the second forwarding link established by the first device; Correspondingly, the processing module is further configured to: release the first forwarding link; and release the second forwarding link.

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