CN111669779B

CN111669779B - Method and apparatus for link detection in device-to-device D2D

Info

Publication number: CN111669779B
Application number: CN201910172382.9A
Authority: CN
Inventors: 王俊伟; 黎超; 张兴炜
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-07
Filing date: 2019-03-07
Publication date: 2021-12-28
Anticipated expiration: 2039-03-07
Also published as: WO2020177740A1; CN111669779A

Abstract

The application provides a method and a device for link detection in device-to-device D2D, which can realize link quality detection of a sidelink by acquiring resource configuration of a reference signal. The method can be used in any of the following scenarios: unmanned driving, an automatic driving system, advanced auxiliary driving, intelligent driving, internet driving, intelligent internet driving and automobile sharing. The method comprises the following steps: a receiving end acquires first indication information, wherein the first indication information is used for indicating the configuration of a first reference signal resource, the first reference signal resource is used for transmitting a radio link measurement reference signal, and the radio link measurement reference signal is used for measuring the quality of a side link; and the receiving end performs the measurement of the quality of the side link according to the first reference signal resource.

Description

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

Technical Field

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

Background

The vehicle networking (V2X) is considered to be one of the fields with the most industrial potential and the most clear market demand in the internet of things system, has the characteristics of wide application space, large industrial potential and strong social benefit, and has important significance for promoting the innovative development of the automobile and information communication industry, constructing a new mode and new state of automobile and traffic service, promoting the innovation and application of the automatic driving technology and improving the traffic efficiency and the safety level.

The 3GPP international organization for standardization has conducted a well-established study on V2X since LTE R14. In the V2X communication architecture, a communication link between V2X UEs is defined as a Sidelink (SL). In the vehicle-all V2X scenario, V2X traffic may be transmitted directly between (UEs) over Sidelink (SL). The data transmission between the V2X devices can be carried out by broadcasting, multicasting or unicasting. With the abundance of data services, the quality of service guarantees are increasingly required. In order to guarantee the transmission quality of the data service, the quality of the sidelink needs to be tracked or detected. At present, no specific scheme for link detection in the V2X scenario is specified in the prior art.

Disclosure of Invention

In view of the above, the present application provides a method and an apparatus for link detection in device-to-device D2D, which enable link quality measurement of a sidelink by indicating resource configuration of a reference signal.

In a first aspect, a method for link detection in device-to-device D2D is provided, including: a receiving end acquires first indication information, where the first indication information is used to indicate 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 measurement reference signal is used to measure quality of a sidelink, and the sidelink is a radio link between the receiving end and a transmitting end in the D2D; and the receiving end carries out the measurement of the quality of the side link according to the first reference signal resource. Therefore, the receiving end can measure the quality of the side uplink based on the configuration of the first reference signal resource indicated by the first indication information.

In one possible implementation, the method further includes: the receiving end receives a side link shared channel from the transmitting end; wherein, the receiving end performs the measurement of the quality of the side link according to the first reference signal resource, and the measurement comprises: if the Cyclic Redundancy Check (CRC) check of the side-link shared channel is correct, the receiving end determines that the side-link shared channel is synchronous, and skips the measurement of a first radio link measurement reference signal, wherein the first radio link measurement reference signal meets a preset condition; or, if the CRC of the sidelink shared channel is checked incorrectly, the receiving end sends an out-of-step indication and skips the measurement of the first radio link measurement reference signal; or, if the CRC of the sidelink shared channel is incorrect, the receiving end measures the radio link measurement reference signal transmitted through the first reference signal resource and sends the measurement result.

Here, the receiving end demodulates, decodes, and CRC checks the sidelink shared channel. If the CRC is correct, the receiving end can avoid measuring the first radio link measurement reference signal, and the correct CRC result can be used as a synchronous indication, so that the measurement times are reduced. Of course, if the CRC check is erroneous, the receiving end may perform measurement on the radio link measurement reference signal transmitted through the first reference signal resource, or may skip measurement on the first radio link measurement reference signal and send the out-of-synchronization indication.

Optionally, the first rlc srs satisfies a preset condition, which is that: the first rlc is a reference signal transmitted in a preset time window after the rlc is transmitted in the rlc, or the first rlc refers to a reference signal transmitted in one or more first reference signal resources closest to the first resource after the first resource, where the first resource is used for receiving the rlc. Wherein, the reference signal transmitted in one or more first reference signal resources closest to the first resource may be understood as: and the reference signals are preset times after the side link shares the channel.

In one possible implementation, the method further includes: the receiving end receives a side link control channel from the transmitting end; the receiving end acquires New Data Indication (NDI) information, wherein the NDI information is used for indicating that the data is newly transmitted data or indicating that the data is retransmitted data; wherein, the receiving end performs the measurement of the quality of the side link according to the first reference signal resource, and the measurement comprises: if the NDI indicating data is newly transmitted data, the receiving end sends a synchronization indication and skips measurement of a second wireless link measurement reference signal, wherein the second wireless link measurement reference signal meets a preset condition; or, if the NDI indication data is retransmission data, the receiving end sends an out-of-synchronization indication and skips measurement on the second reference signal resource; or, if the NDI indicates that the data is retransmission data, the receiving end measures a radio link measurement reference signal transmitted through a first reference signal resource and transmits a measurement result.

Here, the receiving end acquires NDI information by demodulating the sidelink control channel. If the NDI information indicates that the data is newly transmitted data (or it is understood that the NDI is flipped), the receiving end can avoid measuring the second radio link sounding reference signal, and can use the flipping of the NDI as a synchronization indication, thereby reducing the number of measurements. Of course, if the NDI information indicates that the data is retransmission data (or it is understood that the NDI is not flipped), the receiving end may perform measurement on the radio link sounding reference signal transmitted through the first reference signal resource, or may skip measurement on the second radio link sounding reference signal and send the out-of-synchronization indication.

Optionally, the second radio link measurement reference signal meeting a preset condition refers to: the second rlc signal is a reference signal transmitted in a preset time window after the rlc channel, or the second rlc signal is a reference signal transmitted in one or more first rs resources closest to a second resource after the second resource, where the second resource is used for receiving the rlc channel. Wherein, the reference signal transmitted in one or more first reference signal resources closest to the first resource may be understood as: and the reference signal is preset times behind the side-link control channel.

In one possible implementation, the method further includes: the receiving end determines that the side link fails; the receiving end sends failure information to the first device, wherein the failure information is used for indicating that the sidelink fails, and the failure information comprises 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. Therefore, if the sidelink fails, the receiving end may send failure information to the first device, so as to facilitate data communication between the receiving end and the transmitting end through the first device.

Optionally, the method further comprises: and the receiving end transmits data with the transmitting end through the first equipment. That is, the receiving end implements data transmission with the transmitting end through the first device.

Optionally, the transmitting, by the receiving end, data transmission between the transmitting end and the receiving end through the first device includes: the receiving end establishes a first forwarding link with the first device, and the first forwarding link is used for transmitting data between the first device and the receiving end; the receiving end sends data to the first equipment through the first forwarding link; and the receiving end receives data sent by the sending end through first equipment, wherein a second forwarding link is established between the first equipment and the sending end. Specifically, the receiving end may establish a first forwarding link with the first device; and the sending end establishes a second forwarding link with the first equipment. Therefore, the first device can transmit data with the receiving end through the first forwarding link and transmit data with the transmitting end through the second forwarding link, so that data forwarding can be realized, and normal transmission of the transmitting end and the receiving end can be ensured.

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

In one possible implementation, the method further includes: the receiving end determines that the side link is recovered from the failure; and the receiving end sends a link release request to the first equipment, wherein the link release request is used for informing the first equipment to release the first forwarding link and the second forwarding link. Therefore, during the first device serving as a forwarding node, the receiving end may synchronously measure the link quality of the sidelink, and after the measured sidelink is recovered, may send a link release request to the first device, so as to avoid occupying communication resources of the first device.

Optionally, the obtaining, by the receiving end, first indication information includes: the receiving end receives the first indication information from the network equipment. That is, the configuration of the first reference signal resource may be indicated to a receiving end by a network device.

Optionally, the obtaining, by the receiving end, first indication information includes: the receiving end determines first indication information. That is, the configuration of the first reference signal resource may be determined by the receiving end itself.

Optionally, the obtaining, by the receiving end, first indication information includes: and the receiving end receives the first indication information from the transmitting end. That is, the configuration of the first reference signal resource may be indicated by the transmitting end to the receiving end.

In one possible implementation, 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, the resource pool comprises at least one reference signal resource, and each reference signal resource in the at least one reference signal resource is used for transmitting 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: the method comprises the steps that a first device determines configuration of a first reference signal resource, wherein the first reference signal resource is used for measuring the quality of a side link, and the side link is a wireless link between a receiving end and a transmitting end in D2D; the first device sends first indication information, where the first indication information is used to indicate 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 measurement of the sidelink.

In one possible implementation, the method further includes: the first device receives failure information from the receiving end, where the failure information is used to indicate that the sidelink 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; the first equipment establishes a first forwarding link with the receiving end, and the first forwarding link is used for transmitting data between the first equipment and the receiving end; and the first equipment establishes a second forwarding link with the sending end, and the second forwarding link is used for transmitting data between the first equipment 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. Therefore, the first device can transmit data with the receiving end through the first forwarding link and transmit data with the transmitting end through the second forwarding link, so that data forwarding can be realized, and normal transmission of the transmitting end and the receiving end can be ensured.

In one possible implementation, the method further includes: the first device receives a link release request from the receiving end, where the link release request is used for the first device to release the first forwarding link and the second forwarding link established by the first device; the first device releases the first forwarding link; the first device releases the second forwarding link. Here, the receiving end may simultaneously measure the link quality of the sidelink while the first device is acting as a forwarding node, and may send a link release request to the first device after measuring that the sidelink is restored. In this way, after receiving the link release request, the first device may release the corresponding resource to avoid occupying the communication resource 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 of the at least one reference signal resource is used for transmitting a radio link detection reference signal, where the radio link detection reference signal is used for measuring a quality of a sidelink. Therefore, the first device may send the configuration information of the resource pool to the receiving end or the transmitting end in advance, so that the receiving end or the transmitting end may 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 acquires first indication information, wherein the first indication information is used for indicating a first reference signal resource, the first reference signal resource is used for transmitting a radio link measurement reference signal, the radio link measurement reference signal is used for measuring the quality of a side link, and the side link is a radio link between a receiving end and the sending end in the D2D; and the sending end sends a wireless link detection reference signal to the receiving end by using the first reference signal resource. Therefore, the transmitting end transmits the radio 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 measures the quality of the sidelink based on the radio link detection reference signal.

In one possible implementation, the method further includes: and the sending end sends a side link shared channel to the receiving end. The sidelink shared channel may be a PSSCH. In this way, the transmitting end transmits the PSSCH to the receiving end, so that the receiving end demodulates, decodes and checks the PSSCH, and determines whether to measure the reference signal for radio link measurement based on the result of the CRC check.

In one possible implementation, the method further includes: the sending end sends a side link control channel to the receiving end, the side link control channel carries New Data Indication (NDI) information, and the NDI information is used for indicating that the data is newly transmitted data or indicating that the data is retransmitted data; wherein, the sending end uses the first reference signal resource to send the radio link detection reference signal to the receiving end, and the method includes: if the NDI information is used for indicating that the data is newly transmitted data, the sending end cancels the sending of the radio link measurement reference signals in a preset time window, or cancels the sending of one or more radio link measurement reference signals behind the sidelink control channel; or, if the NDI information is used to indicate that the data is retransmission data, the transmitting end transmits a radio link detection reference signal to the receiving end using the first reference signal resource. The sidelink control channel may be a PSCCH. In this way, the sending end sends the PSCCH to the receiving end, so that the receiving end demodulates the PSCCH to obtain the NDI information, thereby determining whether to measure the radio link sounding reference signal based on the content indicated by the NDI information.

Optionally, the obtaining, by the sending end, first indication information includes: the sending end receives the first indication information from the network equipment. That is, the configuration of the first reference signal resource may be indicated to the transmitting end by the network device.

Optionally, the obtaining, by the sending end, first indication information includes: the sending end determines the first indication information. That is, the configuration of the first reference signal resource may be determined by the transmitting end itself.

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

In one 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, the resource pool comprises at least one reference signal resource, and each reference signal resource in the at least one reference signal resource is used for transmitting 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, there is provided a communication device comprising means for performing the method of the first aspect or any possible implementation manner of the first aspect.

In a fifth aspect, there is provided a communication device comprising means for performing the method of the second aspect or any possible implementation manner of the second aspect.

In a sixth aspect, there is provided a communication device comprising means for performing the method of the third aspect or any possible implementation manner of the third aspect.

In a seventh aspect, a communication apparatus is provided, where the communication apparatus may be a receiving end (e.g., a terminal device or a D2D device) designed in the method above, or a chip disposed in the receiving end. The communication device includes: a processor, coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the receiving end in the first aspect and any one of the possible implementations of the first aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

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

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

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In an eighth aspect, a communication apparatus is provided, which may be a first device (e.g., a network device, a terminal device or a D2D device) designed in the above method, or a chip disposed in the first device. The communication device includes: a processor, coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the first device in the first aspect and any one of the possible implementations. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

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

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

In a ninth aspect, a communication apparatus is provided, which may be a transmitting end (for example, a terminal device or a D2D device) designed in the method, or a chip disposed in the transmitting end. The communication device includes: a processor, coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the sending end in the first aspect and any one of the possible implementations of the first aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

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

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

A tenth aspect provides a program for performing the method of the first aspect or any of its possible embodiments when executed by a processor.

In an eleventh aspect, there is provided a program which, when executed by a processor, is adapted to perform the method of the second aspect or any of its possible embodiments.

In a twelfth aspect, there is provided a program which, when executed by a processor, is adapted to perform the method of the third aspect or any of its possible embodiments.

In a thirteenth aspect, a program product is provided, the program product comprising: program code for causing a communication device to perform the method of any of the above first aspect and its possible embodiments, when the program code is run by a communication unit, a processing unit or a transceiver, a processor of a communication apparatus (e.g. a receiving end).

In a fourteenth aspect, a program product is provided, the program product comprising: program code which, when executed by a communication unit, processing unit or transceiver, processor of a communication apparatus (e.g. a first device), causes the communication device to perform any of the methods of the second aspect and its possible embodiments described above.

In a fifteenth aspect, a program product is provided, the program product comprising: program code which, when executed by a communication unit, processing unit or transceiver, processor of a communication device (e.g. a transmitting end), causes a communication apparatus to perform any of the methods of the second aspect and its possible embodiments described above.

In a sixteenth aspect, a computer-readable storage medium is provided, which stores a program that causes a communication apparatus (e.g., a receiving end) to perform the method of the first aspect and any of its possible embodiments.

In a seventeenth aspect, a computer-readable storage medium is provided, which stores a program that causes a communication apparatus (e.g., a first device) to perform the method of any of the second aspect and its possible embodiments.

In an eighteenth aspect, there is provided a computer readable storage medium storing a program for causing a communication apparatus (e.g., a transmitting end) to perform the method of any one of the third aspect and its possible embodiments.

Drawings

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

Fig. 2 is a schematic flow chart 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 detecting a link in D2D according to an embodiment of the present application.

Fig. 4 is a schematic diagram of another example of a method for detecting a link 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.

Fig. 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 a diagram of an example of data consolidation according to an embodiment of the present application.

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

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

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

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

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

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

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

In the description of the embodiments of the present application, the meaning of "plurality" or "items" is two or more unless otherwise specified.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE frequency division duplex (frequency division duplex, FDD) system, a LTE Time Division Duplex (TDD), a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a fifth generation (5G) or new generation (5G) system in the future, a wireless radio system (NR 2, 3583), a device for a global radio access (WiMAX) communication system, a radio access (NR 2, 352) and so on. Alternatively, the V2X system may be embodied as any of the following systems: vehicle-to-internet (V2N), vehicle-to-vehicle (V2V), vehicle-to-vehicle (V2P), and vehicle-to-infrastructure (V2I), among others.

V2N is the most widely used form of car networking, and its main function is to connect the vehicle to the cloud server through the mobile network, so as to provide navigation, entertainment, anti-theft functions through the cloud server.

V2V may be used as an inter-vehicle information interaction reminder, the most typical application being for inter-vehicle collision avoidance safety systems.

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

V2I is used for vehicle-to-infrastructure communication, for example, the infrastructure may be roads, traffic lights, roadblocks, etc., and road management information such as timing of traffic light signals may be acquired.

In this embodiment of the application, both the receiving end and the sending end in D2D may be D2D devices, V2X devices, for example, 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, and the transmitting end is a terminal device, etc.

Taking the example that both the receiving end and the sending end are terminal devices, the transmission mode between the receiving end and the sending end can be a broadcast mode, a multicast mode and a unicast mode.

The broadcast mode is that a sending end transmits data in a broadcast mode, and all receiving ends can analyze side link control information (SCI) and traffic channel information (SSCH). In the sidelink, the way of ensuring that all terminal devices can analyze the control information is: the control information data is not scrambled or uses a scrambling code known to all terminal devices.

The multicast mode is similar to the broadcast mode, and also adopts the broadcast mode to transmit data, and all receiving ends can analyze SCI and SSCH.

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

The terminal device in this embodiment may refer to a User Equipment (UE), a Subscriber Station (SS), a Client Premise Equipment (CPE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user Equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment. The terminal device may also be a software and/or hardware module deployed in an autonomous automobile, a smart automobile, a digital automobile, or a vehicle network automobile. The terminal device in the embodiment of the present application may refer to a D2D device, a V2X device, and a Road Side Unit (RSU).

The network device in this embodiment may be a device for communicating with a terminal device, and the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB ) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved NodeB (eNB, or eNodeB) in an LTE system, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay station, an access point, a vehicle-mounted device, a wearable device, and a network device (gbb) in a future 5G network or a network device in a PLMN network of the future, and the like, and the embodiment of the present invention is not limited.

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

In addition, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

Fig. 1 is a diagram of an example of a system architecture to which an embodiment of the present application is applied. As shown in fig. 1, the communication system includes: V2X application server (application server), V2X devices (including V2X device 1 and V2X device 2), and network devices. The V2X devices communicate with each other through a 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 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 sends the data to the receiving end V2X device; for downstream, the V2X application server sends V2X data to the network device, which sends V2X data to the V2X device over 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 be further understood that the flow direction of the arrow in fig. 1 is only exemplarily described with the V2X device 1, and is not limited to the embodiment of the present application, and in fact, the communication between the V2X device 1 and the V2X device 2 may be bidirectional, and the V2X device 2 may also perform uplink communication with the network device, which is not particularly limited.

Currently, there is no relevant scheme for the measurement of the quality of the sidelink. In order to ensure that data can be transmitted on a high-quality data link, the application provides a link detection method in a D2D device to measure the quality of a sidelink and provide a scheme for ensuring data transmission at a transceiver in case of sidelink failure.

The method for detecting the link in the D2D according to the embodiment of the present application can be applied to any of the following scenarios: unmanned driving, Automatic Driving System (ADS), Advanced Driver Assistance System (ADAS), Intelligent driving (interactive driving), internet driving (connected driving), Intelligent network driving (Intelligent network driving), and vehicle sharing (car sharing).

The method for detecting a link in D2D according to the embodiment of the present application will be described below with reference to fig. 2 to 9.

Fig. 2 shows a schematic flow chart 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, a receiving end obtains first indication information, where the first indication information is used to indicate 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 measurement reference signal is used to measure quality of a sidelink, and the sidelink is a radio link between the receiving end and a transmitting end in D2D.

Similarly, the transmitting end may also obtain the first indication information.

Here, the first indication information is used to indicate which reference signal resource is used for transmitting the radio link measurement reference signal, for example, the first indication information may indicate a resource configuration of the first reference signal resource, and the resource configuration includes one or more of the following information: time domain information of the resource, frequency domain information, code domain information, a transmission period of a radio link measurement reference signal, reference signal density, transmission signal power, a reporting period (for example, a period for reporting an out-of-step indication or a synchronization indication), and the like. Alternatively, the first reference signal resource may be a periodic resource.

In the embodiment of the present application, the radio link measurement reference signal is a reference signal for measuring sidelink quality, but the embodiment of the present application does not specifically limit the specific form of the radio link measurement reference signal, and for example, the radio link measurement reference signal (RLM-RS) or the V2X RLM-RS may be used, or other reference signals for measuring sidelink quality may also be used. For example, the first reference signal resource refers to a resource for transmitting the RLM-RS, and may be referred to as an RLM-RS resource.

It should be understood that the concept "measurement procedure of sidelink", or "V2X RLM procedure" appearing hereinafter may be equivalently replaced, both meaning that the quality of the sidelink is measured.

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

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

If the first indication information is sent by the network device, the network device may determine which one or more terminal devices send the radio link measurement reference signal, and accordingly, may determine which one or more terminal devices perform the sidelink quality measurement. The benefits of direct network device assignment are: the overhead due to coordination among terminal devices is avoided. In addition, if only one unidirectional link quality measurement is made when two terminal devices transmit and receive data to and from each other, the amount of transmission of radio link measurement reference signals can be reduced, and the amount of reception calculation by the terminal devices can be reduced.

Taking the receiving end as an example, if the first indication information is determined by the receiving end, that is, the receiving end selects which reference signal resource the wireless link measurement reference signal is transmitted in, the receiving end can select an idle resource by using an energy detection method, and send the selected resource to the transmitting end. Optionally, the sending end may obtain a plurality of reference signal resources, and then send the plurality of reference signal resources to the receiving end, so that the receiving end selects an optimal resource from the plurality of reference signal resources. The benefits of this are: the receiving end can select the reference signal resource with the minimum interference to carry out the side link quality measurement.

It should be understood that, if the first indication information is determined by the sending end, the behavior of the sending end may refer to the behavior of the receiving end when the "first indication information is determined by the receiving end," and for brevity, details are not described here.

It should also be understood that the receiving end and the transmitting end may be terminal devices or D2D devices, which is not limited in particular.

Optionally, before the receiving end obtains the first indication information, the receiving end may obtain configuration information of a resource pool (or called a resource group), where the configuration information may include one or more resource locations for V2X to perform sidelink detection. I.e. the resource pool comprises at least one reference signal resource, each reference signal resource being for transmitting a radio link detection reference signal. The receiving end can select a first reference signal resource in the resource pool to measure the sidelink quality according to the first indication information. The configuration information of the resource pool may be sent by the network device in a broadcast manner, or may be predefined by a protocol, which is not limited to this. The first reference signal resource is a resource in the resource pool.

Optionally, if the resource pool is configured to be empty, the receiving end may also use a reference signal in a sidelink control channel (e.g., a Physical Sidelink Control Channel (PSCCH) (or referred to as a physical sidelink control channel)) or a data channel (e.g., a physical sidelink shared channel (PSCCH) (or referred to as 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 a corresponding resource location, thereby enabling detection of the sidelink quality.

It should be understood that the measurement procedure of the sidelink may be an activation/deactivation procedure performed by a network device or a terminal device, which is not limited in this application. Alternatively, the network device and the terminal device may start the measurement process of the sidelink according to the requirements of the communication environment and the service communication quality.

For example, if the sending end is denoted as UE TX, the UE TX may determine whether to start the measurement procedure of the sidelink according to a priority level of a service or a transmission quality requirement level (e.g., a packet priority (PPPP) threshold or a QoS Flow Identity (QFI) threshold). Specifically, the method comprises the following steps: if the QCI priority threshold of a service exceeds a certain numerical value in the current data transmission, the UE TX sends a message for activating the measurement of the side link to the opposite terminal UE; and after the priority of the QCLs of all the current services is lower than a certain threshold, the UE TX sends a message for deactivating the sidelink measurement to the opposite terminal UE.

For example, the base station may turn off or on all or a part of the sidelink link measurement procedure through a broadcast message, and when the sidelink measurement procedure is turned off, the corresponding resources (such as RLM-RS resources) for making the measurement are released, and the UE TX stops transmitting the reference signal (such as RLM-RS signal) for making the measurement.

After the measurement process of the sidelink is started in the above manner, the receiving end may perform measurement of the sidelink quality on the first reference signal resource based on the indication of the first indication information. Here, the first reference signal resource may be a plurality of resources periodically, and the receiving end needs to perform measurement on the radio link sounding reference signal on the corresponding resources.

Optionally, in the sidelink measurement process, the following two ways are provided in the embodiments of the present application to reduce the number of times that the receiving end measures the reference signal for the radio link measurement, thereby saving power consumption.

In a first mode

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 by the receiving end, which is described in detail below.

The method 200 further comprises: the transmitting end transmits a side uplink shared channel to the receiving end. Correspondingly, the receiving end receives the side link shared channel from the transmitting 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, demodulates data, decodes the channel and performs CRC check, if the final CRC check is correct, the receiving end determines that the side link shared channel is synchronous, sends a synchronous instruction and skips measurement of a first radio link measurement reference signal, wherein the first radio link measurement reference signal meets a preset condition;

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

or, if the CRC of the sidelink shared channel is incorrect, 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 a physical side uplink shared channel PSSCH transmitted by the transmitting end, and then demodulates, decodes and Cyclic Redundancy Check (CRC) the PSSCH. Then, the receiving end can judge whether the side link is synchronous or not based on the CRC check result, if the check is correct, a measurement process can be replaced to serve as a synchronous indication, and therefore the receiving and operation amount of the reference signal of the wireless link is reduced, and the calculation power consumption is reduced.

If the CRC check is correct, the receiving end can determine that the sidelink is synchronous. After determining synchronization, the receiving end may report a synchronization indication to higher layers. Further, the receiving end may skip the measurement of the first rlc srs. The first rlc refers to a type of reference signal (including one or more rlc signals) that satisfies a predetermined condition, for example, the first rlc is a reference signal transmitted in a predetermined time window after the rlc is received, or the first rlc is a reference signal transmitted in one or more rlc resources closest to a first resource after the first resource of the rlc is received (the one or more rlc resources may be understood as resources used for transmitting rlc signals a predetermined number of times). That is, if the CRC check is correct, the receiving end may skip the measurement of the radio link sounding reference signal within the preset time window after the sidelink shared channel, or skip the measurement of the radio link sounding reference signal for the preset number of times after the sidelink shared channel.

Optionally, the duration 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 broadcasted through a broadcast message, or may be set when establishing a sidelink, which is not limited herein.

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

Describing by way of example in fig. 3, as shown in fig. 3, a0, a1, a2 and A3 are positions of the first reference signal resource indicated by the first indication information, and may be used for transmission of the V2X RLM-RS. The period of the first reference signal resource is T. The receiving end may perform a CRC check on the received psch and then decide whether the RLM-RS within the reception window P is exempt from measurement based on the check result. As can be seen from the upper part of the diagram in fig. 3, when a2 is in the receiving window P, the receiving end does not perform V2X RLM-RS reception or synchronization/out-of-synchronization evaluation on a2 due to correct CRC check, and can skip the measurement of V2X RLM-RS transmitted on a2 and directly report the synchronization indication to the higher layer at the corresponding reporting time. As can be seen from the lower diagram in fig. 3, if the CRC check is wrong, the receiving end needs to perform RLM-RS reception or synchronization/out-of-synchronization evaluation at a position a2, i.e. perform measurement on the V2X RLM-RS at a position a2, and report the measurement result (such as an in-synchronization indication or an out-of-synchronization indication) to a higher layer. In fig. 3, an example of a first radio link measurement reference signal of V2X RLM-RS transmitted at a 2.

Therefore, the receiving end uses the correct demodulation result of the data as the synchronous indication, the measurement times of the RLM-RS are reduced, the calculation power consumption can be reduced, and the power consumption of the equipment is saved.

Mode two

In data transmission, a sending end sends data for multiple times, so that the correct transmission rate of the data is improved. In order to indicate whether 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 new transmission is determined by the inversion of NDI, specifically: with respect to the NDI value of the previous transmission of the same HARQ process, if the NDI value of the current transmission is flipped, that is, the NDI indication of the current transmission is different from the NDI indication of the last transmission (for example, flipped from 0 to 1 (that is, the NDI indication of the last transmission is 0, the NDI of the current transmission is 1), or flipped from 1 to 0 (that is, the NDI indication of the last transmission is 1, the NDI of the current transmission is 0)), the current transmission is considered to be a new transmission, and if the NDI value of the local transmission is not flipped (for example, flipped from 0 to 0 (that is, the NDI indication of the last transmission is 0, the NDI of the current transmission is still 0), or flipped from 1 to 1 (that is, the NDI indication of the last transmission is 1, the NDI of the current transmission is still 1)), the current 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 flip), it can be used as a synchronization indication to reduce the number of measurements by the receiving end, which is described in detail below.

The method 200 further comprises: the transmitting end transmits a sidelink control channel to the receiving end. Correspondingly, the receiving end receives the sidelink control channel from the transmitting end. The receiving end demodulates and analyzes the sidelink control channel to acquire new data indication NDI information, wherein the NDI information is used for indicating that the data is newly transmitted data or indicating that the data is retransmitted data.

For a sending end, if the NDI indicates that the data is newly transmitted data, the sending end cancels sending of radio link measurement reference signals within a preset time window, or cancels sending of one or more radio link measurement reference signals (which may be understood as radio link measurement reference signals of a preset number of times) after the sidelink control channel.

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

or, if the NDI indication data is retransmission data, the receiving end sends an out-of-synchronization indication and skips measurement on the second radio link measurement reference signal;

or, if the NDI indicates that the data is retransmission data, the receiving end measures a radio link measurement reference signal transmitted through a first reference signal resource and transmits a measurement result.

Specifically, the receiving end receives the PSCCH sent by the sending end, demodulates the PSCCH, and may obtain the NDI. The receiving end can judge whether the sidelink is synchronous according to the specific content of the NDI indication, if the NDI indication data is newly transmitted data, the receiving end can replace a measuring process with the newly transmitted indication of the NDI as a synchronous indication, namely, measurement of the second wireless link measurement reference signal is skipped, so that the receiving and operation amount of the wireless link reference signal is reduced, and the calculation power consumption is reduced.

That is, if the NDI in the PSCCH is flipped (i.e., indicating that the data is a newly transmitted packet), the receiving end can determine that the sidelink is synchronized. The receiving end may report the synchronization indication to the higher layers. Further, the receiving end may skip the measurement of the second radio link measurement reference signal. For example, the second rlc signal is a reference signal transmitted in a preset time window after the sidelink control channel is received, or the second rlc signal is a reference signal transmitted in one or more first rlc signal resources (the one or more first rlc signal resources may be understood as resources used for transmitting rlc signals for a preset number of times) that are closest to a second resource of the sidelink control channel after the second resource of the sidelink control channel is received. In other words, if the NDI indicates a new transmission, the receiving end may skip the measurement of the rlc signal within a preset time window after the rlc channel, or skip the measurement of the rlc signal a preset number of times after the rlc 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 a higher layer of the receiving end. Optionally, the physical layer of the receiving end may also report an effective time of the synchronization indication to a higher layer of the receiving end, where the effective time refers to a transmission time of last data corresponding to the same HARQ process number as the newly transmitted data.

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

If the NDI in the PSCCH is not flipped (i.e., indicating that the data is a retransmitted packet), the receiving end may determine that the sidelink is out-of-sync. The receiving end may send an out-of-sync indication to higher layers and skip the measurement of the second radio link measurement reference signal. Or, if the NDI in the PSCCH is not inverted, the receiving end does not send the out-of-step indication, but performs measurement on the second radio link measurement reference signal, and then reports the measurement result to the higher layer.

Describing by way of example in fig. 4, as shown in fig. 4, a0, a1, a2 and A3 are positions of the first reference signal resource indicated by the first indication information, and may be used for transmission of the V2X RLM-RS. P1 and P2 are positions for transmitting 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 decide whether the V2X RLM-RS within the reception window P is free from measurement based on the specific content of the NDI indication. Optionally, the receiving window P may be the same as or different from the period T, which is not limited herein.

As can be seen from fig. 4, at the position of P1, the receiving end receives the PSCCH and demodulates it to obtain the NDI. Where a2 is within the receive window P. Because the NDI indication data is turned over, the receiving end does not receive the V2X RLM-RS or perform in-sync/out-of-sync evaluation any more at a2, and can skip the measurement of the V2X RLM-RS transmitted at a2 and directly report the sync indication to the higher layer at the corresponding reporting time. In fig. 4, an example of a second radio link measurement reference signal of V2X RLM-RS transmitted at a 2.

At the position of P2, the receiving end receives the PSCCH and demodulates it to obtain NDI. Since NDI indicates that data is not flipped, the receiving end needs to perform V2X RLM-RS reception or in-sync/out-of-sync evaluation at a position of a2, i.e. perform measurement on V2X RLM-RS at a position of a2, and report the measurement result (such as in-sync indication or out-of-sync indication) to a higher layer.

Therefore, the receiving end uses the NDI to indicate that the newly transmitted data is used as the synchronous indication, so that the measurement times of the RLM-RS are reduced, the calculation power consumption can be reduced, and the power consumption of the equipment is saved.

In summary, in the process of measuring the sidelink quality, if the receiving end adopts the above-mentioned first or second mode, the measurement of the radio link detection reference signal can be effectively reduced, and the calculation power consumption is reduced.

In the normal case: the reception of reference signals for measuring the quality of the sidelink and the evaluation process of the link quality are completed in the physical layer. After finishing a quality evaluation, the physical layer reports "in-sync/out-of-sync" information to a higher layer (such as a Media Access Control (MAC) layer or an RRC layer), and the higher layer finally determines a radio link failure (radio link failure) by counting information reported by the physical layer for many times and combining a determination method of the prior art.

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

Fig. 5 shows a schematic interaction diagram of a recovery method 500 according to an embodiment of the 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 sidelink fails, and the failure information includes one or more of the following information: the identification information of the sending end, the identification information (for example, a service ID) of a service transmitted between the receiving end and the sending end, and the priority information (for example, a priority identifier of a service) of a service. Correspondingly, the first device receives the failure information.

Specifically, the receiving end may send failure information to the first device in order to forward data transmitted between the receiving end and the transmitting end through the first device, when determining that the sidelink fails.

Optionally, the method 500 further comprises: s530, the receiving end performs data transmission with the transmitting end through the first device.

Specifically, the transmitting 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 forwarding link is used for the first device to receive data sent by the receiving end;

and the receiving end receives data sent by the sending end through first equipment, wherein a second forwarding link is established between the first equipment and the sending end.

That is, a first forwarding link (for example, a forwarding downlink) needs to be established between the receiving end and the first device, so that the first device receives the data sent by the receiving end to the transmitting end. Accordingly, a second forwarding link (e.g., a forwarding uplink) needs to be established between the first device and the transmitting end, so that the first device receives data sent by the transmitting end to the receiving end.

The receiving end can synchronously detect the quality of the side link while the first device forwards the data, and once the side link is detected to be restored to the synchronous state, a link release request can be sent to the first device. Optionally, the method 500 further comprises:

the receiving end determines that the side link is recovered from the failure; the receiving end sends a link release request to the first device, where the link release request is used for the first device to release the first forwarding link and the second forwarding link established by the first 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. Wherein "restore to normal" may be understood as a restoration of the link 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 recover the link by adjusting the transmission power. The failure information further comprises one or more of the following information: path loss information (e.g., path values) from a receiving end (e.g., receiving end UE) to a transmitting end (e.g., transmitting end UE) or other values (e.g., RSRP, RSRQ, or RSSI) capable of representing the quality of the V2X link, and geographical location information of the transmitting end. Correspondingly, after receiving the failure information, the first device (e.g., the base station) may send power adjustment information to the sending end, where the power adjustment information includes, for example, a control parameter for adjusting quality of sending power or updating sending power, so as to improve sending power of the sending end and improve 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, based on a trigger condition, the sending end (e.g., the sending end UE) and the receiving end (e.g., the receiving end UE) to terminate data transmission of the sidelink. The trigger condition may be: the distance between the sending end and the receiving end exceeds a certain threshold, or the sending 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, an RLM-RS resource), where the new reference signal resource may include: different RLM-RS resource positions on the same carrier, or RLM-RS resource positions of other carriers. Specifically, the transmitting end transmits a reference signal (e.g., RLM-RS) at an RLM-RS resource location of the channel, and 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 sidelink connection on the channel carrier.

Optionally, the first device may be a network device (e.g., a base station), a D2D device (e.g., a terminal device, or a terminal device in a specific group), or a Road Side Unit (RSU), which is not limited thereto.

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

For ease of understanding, the link recovery process in the unicast link scenario is described in detail below in conjunction with the example in fig. 6. As shown in fig. 6, taking the first device as a base station (e.g., a gNB), the receiving end as a UE1, and the transmitting end as a UE2 as an example, the method includes:

601: the UE1 reports failure information (or a forward link request) to the base station to request establishment of a sidelink data forward link.

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

602: the base station establishes a second forwarding link.

The second forwarding link refers to a link between the data source end and the base station. The process of establishing the forwarding uplink by the base station comprises the following steps: establishing a forwarding uplink according to the 'QOS uplink' transmission quality requirement; establishment and parameter configuration of relevant forwarding link logical channels/transport channels.

Optionally, before establishing the forwarding link, the base station needs to decompose the QOS transmission quality requirement of the sidelink, which may be a QOS uplink or a QOS downlink. Wherein QOS uplink refers to the transmission quality on the forwarding link between the UE2 and the base station (i.e., the second forwarding link), and QOS downlink refers to the QOS requirement of the forwarding link between the base station and the UE1 (i.e., the first forwarding link). Alternatively, the QOS result decomposed by the base station may be: the performances of uplink and downlink time delay and bit error rate are consistent with the performance of side link QOS.

603: the base station establishes a first forwarding link.

Wherein the first forwarding link refers to a link between the UE1 and a base station. The process of the base station for establishing the first forwarding link comprises the following steps: establishing a forwarding downlink according to the 'QOS downlink' transmission quality requirement; establishment and parameter configuration of relevant forwarding link logical channels/transport channels.

604: the UE2 sends the sidelink data to the base station.

That is, the UE2 may send the sidelink data to the base station over the second forwarding link, such that the base station forwards the sidelink data to the UE 1. Alternatively, the base station may forward the data transmitted by the UE1 to the UE2 through the second forwarding link.

605: the base station forwards the sidelink data to the UE 1.

Here, the base station may forward the sidelink data to the UE1 through the first forwarding link and may also receive data sent by the UE1 to the UE 2.

Optionally, the resource used by the base station to forward the sidelink data, or the scheduling resource used by the base station to communicate with the UE2 may use a resource in a resource pool of the sidelink, or may use a resource of the cellular Uu port, which is not limited herein.

606: the UE1 performs the sidelink RLM-RS procedure.

After the base station establishes the forward link, the UE1 may proceed with the measurement process of the sidelink, i.e., measure the quality of the sidelink between the UE1 and the UE 2. When the sidelink recovers from the failure state, the UE1 sends a forward link release request to request release of the forward link, and the transmission of the related data is switched from the forwarding of the Uu port to the sidelink transmission.

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

If the UE1 detects that the sidelink has been restored, a link release request is sent to the base station. The link release request is used for informing a 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 sidelink, so that the data transmission from the receiving end to the sending end can be effectively maintained, and the user experience is improved.

For example, if the failure information in step 601 includes the path loss information between the UE1 and the UE2, the base station may adjust the transmit power of the UE 2. Optionally, the example in fig. 6 may further include:

608: the base station sends power adjustment information to the UE 2.

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/PSCCH.

609: the base station sends the power parameters of the UE2 to the UE 1.

Here, the base station sends the power parameter of UE2 to UE1 so that UE1 knows the adjusted transmit power of UE 2. The UE1, upon receiving the power parameter of the UE2, may reset the power parameter during the sidelink detection process and use the new power parameter to calculate the road loss value of the sidelink.

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

Alternatively, 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 may be selected according to one or more of the following determination conditions: whether a channel between the terminal device and the receiving end is good enough (for example, whether the distance between the terminal device and the receiving end is smaller 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 is described in detail below in conjunction with the example in fig. 7. Fig. 7 shows an architecture diagram of a multicast link scenario. As shown in fig. 7, UE3 is the data source, i.e. the transmitting end of data, and simultaneously transmits V2X RLM-RS, UE1, UE2, UDE4, UE5, and UE6 are receiving UEs. If a link failure occurs between the UE2 and the UE3, data forwarding may be performed by the UE 1. As shown in fig. 8, taking the first device as a terminal device (e.g., UE1), the receiver as UE2, and the transmitter as UE3 as an example, the process in fig. 8 includes:

801: the UE2 sends failure information.

Alternatively, the UE2 may broadcast failure information (or forward a link request) within the group when it finds that the sidelink is out of synchronization.

802: the UE1 may establish a forwarding link after receiving the failure information. The forwarding link is a forwarding link between UE1 and UE 2.

Here, data communication may be conducted between the UE1 and the UE3, so the UE1 here needs to establish a forwarding link between the UE1 and the UE 2.

Optionally, the UE1 may need to determine whether it satisfies the forwarding node condition before establishing the forwarding link.

Alternatively, the determination condition may include whether the channel between the UE1 and the UE2 is good enough, such as whether the distance is smaller than a preset threshold (e.g., 100 meters), or whether the RSRP of the UE1 is larger than a certain threshold.

Assuming that the UE1 satisfies the conditions of the forwarding node, the UE1 can act as a forwarding node for performing sidelink data forwarding. The UE1 may respond to the UE2 and send the UE ID of the forwarding node, i.e., the ID of the UE1, to the UE 2.

803: the UE1 receives sidelink data.

The UE1 may receive the sidelink data transmitted by the UE 3. Specifically, the sidelink data receiving process means that the UE1 listens to the control channel transmitted by the UE3 and performs data analysis. Wherein, the control channel may include: HARQ-ID, group ID (group ID).

804: the UE1 forwards the sidelink data.

After establishing the forwarding link, the UE1 may forward the received sidelink data from the UE3 using the forwarding link established in step 802. Specifically, the procedure of forwarding the sidelink data refers to a procedure in which the UE1 forwards the received data (including the HARQ-DI of the control channel) to the UE 2.

805: the UE2 performs measurement procedures for the sidelink.

After the UE1 establishes the forwarding link, the UE2 may proceed with the measurement process of the link between the UE2 and the UE 3.

806: when the sidelink returns to normal from the failed state, the UE2 sends a forward link release request to the UE 1.

After receiving the link release request, the UE1 releases the forwarding link established in step 802. The transmission of the relevant data of the UE1 is switched to the side-link transmission by the forwarding of the UU interface.

Therefore, in this example, the UE in the group forwards data on the sidelink, so that data transmission from the receiving end to the transmitting end can be effectively maintained, and user experience is improved.

Alternatively, if the forwarding link is established based on the UE, the receiving end UE may combine the data sent by the sending end UE and the data of the forwarding UE. As illustrated by the example in fig. 9, as shown in fig. 9, the transmitting UE3 (i.e., data source) transmits TB1 to UE2 and UE1, and it is difficult to correctly demodulate TB1 alone due to the poor link performance of UE2 and UE 3. Thus, data between UE2 and UE3 is link forwarded by UE 1. After receiving the TB1 sent by the UE3, the UE2 buffers the data, and when receiving the TB1 forwarded by the UE1, merges the two paths of data, thereby demodulating the data as much as possible.

In order to realize the two-way data combination, the signaling needs to be designed as follows: (1) when the UE3 sends the TB1, the HARQ-ID carried by the corresponding control channel is the same as the HARQ-ID carried by the UE1 when the TB1 is forwarded; packets labeled all TB 1; (2) when the UE1 forwards data, it needs to carry information of the UE3, i.e. information indicating the UE3 to be forwarded.

It should be understood that the examples in fig. 3, 4, 6 to 9 are only for facilitating the understanding of the embodiments of the present application by those skilled in the art, and are not intended to limit the embodiments of the present application to the specific scenarios illustrated. It will be apparent to those skilled in the art that various equivalent modifications or variations can be made based on the examples in fig. 3, 4, 6 to 9, and such modifications or variations also fall within the scope of the embodiments of the present application.

It should also be understood that the above description is given by taking the first device as a base station or a UE as an example, and reference may be made to the above description for related embodiments in which the first device is an RSU, which is not described herein for brevity.

It should also be understood that the various aspects of the embodiments of the present application can be combined and used reasonably, and the explanation or illustration of the various terms appearing in the embodiments can be mutually referred to or explained in the various embodiments, which is not limited.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method for detecting a link in D2D according to the embodiment of the present application is described in detail above with reference to fig. 1 to 9. An apparatus of a method for detecting a link in D2D according to an embodiment of the present application will be described below with reference to fig. 10 to 15. It should be understood that the technical features described in the method embodiments are equally applicable to the following apparatus 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 apparatus 1000 is configured to perform the method performed by the receiving end in the foregoing method embodiment. Alternatively, the specific form of the apparatus 1000 may be a receiving end or a chip in the receiving end. Alternatively, the receiving end may be a terminal device or a roadside station unit RSU. The embodiments of the present application do not limit this. The apparatus 1000 comprises:

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

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

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

receiving a side link shared channel from the transmitting end;

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

if the CRC of the side link shared channel is correct, determining that the side link shared channel is synchronous, and skipping measurement of a first radio link measurement reference signal, wherein the first radio link measurement reference signal meets a preset condition;

or, if the CRC of the sidelink shared channel is incorrect, the transceiver module 1010 is invoked to send an out-of-synchronization instruction, and measurement of the first radio link measurement reference signal is skipped;

or, if the CRC of the sidelink shared channel is in error, the radio link measurement reference signal transmitted through the first reference signal resource is measured, and the transceiver module 1010 is invoked to transmit the measurement result.

Optionally, the first rlc srs satisfies a preset condition, which is that: the first radio link measurement reference signal is a reference signal transmitted in a preset time window after the sidelink shared channel,

or, the first rlc srs refers to an srs transmitted in one or more first srs resources closest to a first resource after the first resource, where the first resource is used for receiving the sidelink shared channel.

receiving a sidelink control channel from the transmitting end;

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

if the NDI indication data is newly transmitted data, invoking the transceiver module 1010 to transmit a synchronization indication, and skipping measurement of a second radio link measurement reference signal, where the second radio link measurement reference signal meets a preset condition;

or, if the NDI indication data is retransmission data, the transceiver module 1010 is invoked to send an out-of-synchronization indication, and measurement of the second reference signal resource is skipped;

or, if the NDI indicates that the data is retransmission data, measuring a radio link measurement reference signal transmitted through a first reference signal resource, and transmitting a measurement result.

Optionally, the second radio link measurement reference signal meeting a preset condition refers to: the second radio link measurement reference signal is a reference signal transmitted in a preset time window after the sidelink control channel,

or, the second radio link measurement reference signal is a reference signal transmitted in one or more first reference signal resources closest to a second resource after the second resource, where the second resource is used for receiving the sidelink control channel.

In one possible implementation, the processing module 1020 is further configured to: determining that the sidelink failed;

the transceiver module 1010 is further configured to: sending failure information to a first device, wherein the failure information is used for indicating that the sidelink fails, and the failure information comprises 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 one possible implementation, the transceiver module 1010 is further configured to: and transmitting data with the transmitting end through the first equipment.

In a possible implementation manner, the transceiver module 1010 is configured to perform data transmission with the sending end through the first device, and specifically includes:

establishing a first forwarding link with the first device, wherein the first forwarding link is used for transmitting data between the first device and the receiving end;

transmitting data to the first device over the first forwarding link;

and receiving data sent by the sending end through first equipment, wherein the first equipment and the sending end establish a second forwarding link.

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

determining that the sidelink has recovered from failure;

correspondingly, the transceiver module 1010 is further configured to: and sending a link release request to the first device, wherein the link release request is used for informing the first device to release the first forwarding link and the second forwarding link.

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

Optionally, the transceiver module 1010 is configured to acquire the first indication information, and specifically includes: receiving the first indication information from the transmitting end.

Optionally, the transceiver module 1010 is further configured to: obtaining configuration information of a resource pool, wherein the first reference signal resource is a resource in the resource pool, the resource pool comprises at least one reference signal resource, and each reference signal resource in the at least one reference signal resource is used for transmitting a radio link detection reference signal.

It should be understood that the apparatus 1000 of the method for detecting a link in D2D according to the embodiment of the present application may correspond to the method at the receiving end in the foregoing method embodiment, for example, the method at the receiving end in fig. 2 or fig. 5, and the above and other management operations and/or functions of each module in the apparatus 1000 are respectively for implementing corresponding steps of the method at the receiving end in the foregoing method embodiment, so that beneficial effects in the foregoing method embodiment may also be implemented, and for brevity, no repeated description is provided herein.

It should also be understood that the various modules in the apparatus 1000 may be implemented in software and/or hardware, and are not particularly limited in this regard. In other words, the apparatus 1000 is presented in the form of a functional module. As used herein, a "module" may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the described functionality. Alternatively, in a simple embodiment, one skilled in the art will recognize that the device 1000 may take 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 illustrated in fig. 11. In particular, the processor is implemented by executing a computer program stored in the memory. Alternatively, when the apparatus 1000 is a chip, the functions and/or implementation processes of the transceiver module 1010 can be implemented by pins, circuits or the like. Optionally, the memory is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the computer device, such as the memory 1102 in fig. 11.

Fig. 11 is a schematic block diagram of an apparatus 1100 for a method of link detection in D2D according to an embodiment of the present application. Alternatively, 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 one possible implementation, the processor 1101 is configured to invoke an interface to perform the following actions: acquiring first indication information, where the first indication information is used to indicate 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 measurement reference signal is used to measure quality of a sidelink, and the sidelink is a radio link between the receiving end and the transmitting end in the D2D; the processor 1101 is further configured to perform a sidelink quality measurement based on the first reference signal resource.

It should be understood that the processor 1101 may invoke an interface to perform the transceiving action, wherein the invoked interface may be a logical interface or a physical interface, which is not limited thereto. Alternatively, the physical interface may be implemented by a transceiver. Optionally, the apparatus 1100 further comprises a transceiver 1103.

Optionally, the apparatus 1100 further comprises a memory 1102, and the memory 1102 may store the program codes in the above method embodiments, so as to be called by the processor 1101.

Specifically, if the apparatus 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 to transmit control and/or data signals through the internal connection path. In one possible design, the processor 1101, the memory 1102 and the transceiver 1103 may be implemented by chips, and the processor 1101, the memory 1102 and the transceiver 1103 may be implemented in the same chip, or may be implemented in different chips, or any two of the functions may be implemented in one chip. The memory 1102 may store program code, which the processor 1101 calls to the memory 1102 to implement the corresponding functions of the apparatus 1100.

It should be understood that the apparatus 1100 may also be used for performing other steps and/or operations on the receiving end side in the foregoing embodiments, and the description is omitted here for brevity.

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 apparatus 1200 is configured to execute the method performed by the transmitting end in the foregoing method embodiment. Optionally, the specific form of the apparatus 1200 may be a transmitting end or a chip in the transmitting end. Alternatively, the transmitting end may be a terminal device or a roadside station unit RSU. The embodiments of the present application do not limit this. The apparatus 1200 comprises:

a transceiver module 1210, 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, where the radio link measurement reference signal is used to measure quality of a sidelink, and the sidelink is a radio link between a receiving end and the transmitting end in the D2D;

the transceiver module 1210 is further configured to transmit a radio link detection reference signal to the receiving end by using the first reference signal resource.

In one possible implementation manner, the transceiver module 1210 is further configured to: and transmitting the side link shared channel to the receiving end.

In one possible implementation manner, the transceiver module 1210 is further configured to: sending a sidelink control channel to the receiving end, wherein the sidelink control information carries New Data Indication (NDI) information, and the NDI information is used for indicating that the data is newly transmitted data or indicating that the data is retransmitted data;

the transceiver module 1210 is configured to send a radio link detection reference signal to the receiving end by using the first reference signal resource, and specifically includes:

if the NDI information is used for indicating that the data is newly transmitted data, canceling the transmission of the radio link measurement reference signals in a preset time window, or canceling the transmission of one or more radio link measurement reference signals behind the sidelink control channel;

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

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

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

Optionally, the transceiver module 1210 is further configured to: obtaining configuration information of a resource pool, wherein the first reference signal resource is a resource in the resource pool, the resource pool comprises at least one reference signal resource, and each reference signal resource in the at least one reference signal resource is used for transmitting a radio link detection reference signal.

It should be understood that the apparatus 1200 of the method for detecting a link in D2D according to this embodiment 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 apparatus 1200 are respectively for implementing corresponding steps of the method of the sending end in the foregoing method embodiment, so that beneficial effects in the foregoing method embodiment may also be implemented, and for brevity, no further description is provided here.

It should also be understood that the various modules in the apparatus 1200 may be implemented in software and/or hardware, and are not particularly limited in this regard. In other words, the apparatus 1200 is presented in the form of a functional module. As used herein, a "module" may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the described functionality. Alternatively, in a simple embodiment, one skilled in the art will recognize that apparatus 1200 may take the form shown in FIG. 13. The transceiver module 1210 may be implemented by the transceiver 1303 shown in fig. 13. In particular, the processor is implemented by executing a computer program stored in the memory. Alternatively, when the apparatus 1200 is a chip, the functions and/or implementation procedures of the transceiver module 1210 may be implemented by pins, circuits or the like. Optionally, the memory is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the computer device, such as the memory 1302 in fig. 13.

Fig. 13 is a schematic block diagram of an apparatus 1300 for a method of link detection in D2D according to an embodiment of the present application. Alternatively, 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 one possible implementation, the processor 1301 is configured to invoke an interface to perform the following actions: acquiring 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, where the radio link measurement reference signal is used to measure the quality of a sidelink, and the sidelink is a radio link between a receiving end and the transmitting end in the D2D; and transmitting a radio link detection reference signal to the receiving end by using the first reference signal resource.

It should be understood that the processor 1301 may invoke an interface to perform the transceiving action, wherein the invoked interface may be a logical interface or a physical interface, which is not limited thereto. Alternatively, the physical interface may be implemented by a transceiver. Optionally, the apparatus 1300 further comprises a transceiver 1303.

Optionally, the apparatus 1300 further includes a memory 1302, and the memory 1302 may store the program codes in the above method embodiments, so as to be called by the processor 1301.

Specifically, if the apparatus 1300 includes the processor 1301, the memory 1302 and the transceiver 1303, the processor 1301, the memory 1302 and the transceiver 1303 may communicate with each other through the internal connection path to transmit control and/or data signals. In one possible design, the processor 1301, the memory 1302, and the transceiver 1303 may be implemented by chips, and the processor 1301, the memory 1302, and the transceiver 1303 may be implemented in the same chip, or may be implemented in different chips, or any two of the functions may be implemented in one chip. The memory 1302 may store program code, which the processor 1301 calls to implement the 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 transmitting end side in the foregoing embodiments, and therefore, for brevity, the detailed description is omitted 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 apparatus 1400 is configured to perform the method performed by the first device in the foregoing method embodiment. Alternatively, the specific form of the apparatus 1400 may be the first device or a chip in the first device. Alternatively, the first device may be a terminal device, a network device or a roadside station unit RSU. The embodiments of the present application do not limit this. The apparatus 1400 comprises:

a processing module 1410, configured to determine configuration of a first reference signal resource, where the first reference signal resource is used to perform measurement of quality of a sidelink, where the sidelink is a wireless link between a receiving end and a transmitting end in the D2D;

a transceiving module 1420, configured to send first indication information, where the first indication information is used to indicate a 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, wherein the failure information is used for indicating that the sidelink fails, and the failure information comprises 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;

correspondingly, the processing module 1410 is further configured to: establishing a first forwarding link with the receiving end, wherein the first forwarding link is used for transmitting data between the first device and the receiving end; and establishing a second forwarding link with the sending end, wherein the second forwarding link is used for transmitting data between the first device and the sending end.

receiving a link release request from the receiving end, where the link release request is used for 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: releasing the first forwarding link; releasing the second forwarding link.

It should be understood that the apparatus 1400 of the method for detecting a link 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 and other management operations and/or functions of each module in the apparatus 1400 are respectively for implementing corresponding steps of the method of the first device in the foregoing method embodiment, so that beneficial effects in the foregoing method embodiment may also be implemented, and for brevity, are not described herein again.

It should be further understood that the modules in the apparatus 1400 may be implemented in software and/or hardware, and are not particularly limited in this regard. In other words, the apparatus 1400 is presented in the form of a functional module. As used herein, a "module" may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the described functionality. Alternatively, in a simple embodiment, one skilled in the art may appreciate that the apparatus 1400 may take the form shown in FIG. 15. Processing module 1410 may be implemented by processor 1501 shown in fig. 15. The transceiver module 1420 may be implemented by the transceiver 1503 shown in fig. 15. In particular, the processor is implemented by executing a computer program stored in the memory. Alternatively, when the apparatus 1400 is a chip, the functions and/or implementation procedures of the transceiver module 1420 may also be implemented by pins or circuits, etc. Optionally, the memory is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the computer device, such as the memory 1502 in fig. 15.

Fig. 15 is a schematic block diagram of an apparatus 1500 of a method for link detection in D2D according to an embodiment of the present application. Alternatively, 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 a configuration of a first reference signal resource, where the first reference signal resource is used for performing measurement of a sidelink quality, and the sidelink is a radio link between a receiving end and a transmitting end in the D2D; the processor 1501 is configured to invoke an interface to perform the following actions: transmitting first indication information, wherein the first indication information is used for indicating the configuration of the first reference signal resource.

It should be understood that the processor 1501 may invoke an interface to perform the transceiving actions described above, wherein the invoked interface may be a logical interface or a physical interface, which is not limited thereto. Alternatively, the physical interface may be implemented by a transceiver. Optionally, the apparatus 1500 further comprises a transceiver 1503.

Optionally, the apparatus 1500 further comprises a memory 1502, wherein the memory 1502 may store the program codes of the above method embodiments for the processor 1501 to call.

Specifically, if the apparatus 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 via an internal connection path to transmit control and/or data signals. In one possible design, the processor 1501, the memory 1502 and the transceiver 1503 may be implemented by chips, and the processor 1501, the memory 1502 and the transceiver 1503 may be implemented in the same chip, or may be implemented in different chips, or any two functions may be combined and implemented in one chip. The memory 1502 may store program code that the processor 1501 calls stored by the memory 1502 to implement the 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 embodiments, and details are not described herein for brevity.

The method disclosed in the embodiments of the present application may be applied to a processor, or may be implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a Digital Signal Processor (DSP), a Microcontroller (MCU), a programmable logic controller (PLD), or other integrated chip. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in the embodiment of the present invention, the numbers "first" and "second" … are only used for distinguishing different objects, such as for distinguishing different resources, and do not limit the scope of the embodiment of the present application, and the embodiment of the present application is not limited thereto.

It should also be understood that some terms or concepts (such as synchronous indication, out-of-step indication, etc.) appearing in the embodiments of the present application may also be referred to by those skilled in the art, and are not described in detail herein.

It should also be understood that the term "and/or" herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

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

Items appearing in this application as similar to "include one or more of the following: the meaning of the expressions A, B, and C "generally means that the item may be any of the following, unless otherwise specified: 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 C, C and C; c, C and C, and other combinations of A, B and C. The above description is made by taking 3 elements of a, B and C as examples of optional items of the item, and when the expression "item" includes at least one of the following: a, B, … …, and X ", i.e., more elements in the expression, then the items to which the item may apply may also be obtained according to the aforementioned rules.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

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

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

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

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

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

Claims

1. A method of link detection in device-to-device D2D, comprising:

a receiving end acquires first indication information, where the first indication information is used to indicate 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 measurement reference signal is used to measure quality of a sidelink, and the sidelink is a radio link between the receiving end and a transmitting end in the D2D;

and the receiving end performs the sidelink quality measurement according to first information and the first reference signal resource, wherein the first information comprises a sidelink shared channel Cyclic Redundancy Check (CRC) check result or New Data Indication (NDI) information.

2. The method of claim 1, further comprising:

the receiving end receives a side link shared channel from the transmitting end;

wherein, the receiving end performs the measurement of the quality of the sidelink according to the first information and the first reference signal resource, and the measurement comprises:

if the CRC of the side link shared channel is correct, the receiving end determines that the side link shared channel is synchronous, and skips the measurement of a first radio link measurement reference signal, wherein the first radio link measurement reference signal meets a preset condition;

or, if the CRC of the sidelink shared channel is checked incorrectly, the receiving end sends an out-of-step indication and skips the measurement of the first radio link measurement reference signal;

3. The method of claim 2, wherein the first rlc srs satisfies a predetermined condition: the first radio link measurement reference signal is a reference signal transmitted in a preset time window after the sidelink shared channel,

4. The method of claim 1, further comprising:

the receiving end receives a side link control channel from the transmitting end;

the receiving end acquires the NDI information, wherein the NDI information is used for indicating that the data is newly transmitted data or indicating that the data is retransmitted data;

if the NDI indicating data is newly transmitted data, the receiving end sends a synchronization indication and skips measurement of a second wireless link measurement reference signal, wherein the second wireless link measurement reference signal meets a preset condition;

5. The method according to claim 4, wherein the second RLC RS meeting the predetermined condition is: the second radio link measurement reference signal is a reference signal transmitted in a preset time window after the sidelink control channel,

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

the receiving end determines that the side link fails;

the receiving end sends failure information to the first device, wherein the failure information is used for indicating that the sidelink fails, and the failure information comprises 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.

7. The method of claim 6, further comprising:

and the receiving end transmits data with the transmitting end through the first equipment.

8. The method of claim 7, wherein the transmitting of data from the receiving end to the transmitting end through the first device comprises:

the receiving end establishes a first forwarding link with the first device, and the first forwarding link is used for transmitting data between the first device and the receiving end;

the receiving end sends data to the first equipment through the first forwarding link;

9. The method of claim 8, further comprising:

the receiving end determines that the side link is recovered from the failure;

and the receiving end sends a link release request to the first equipment, wherein the link release request is used for informing the first equipment to release the first forwarding link and the second forwarding link.

10. A method of link detection in device-to-device D2D, comprising:

a sending end acquires first indication information, wherein the first indication information is used for indicating a first reference signal resource, the first reference signal resource is used for transmitting a radio link measurement reference signal, the first information and the first reference signal resource are used for performing sidelink quality measurement, the radio link measurement reference signal is used for measuring the quality of a sidelink, the sidelink is a radio link between a receiving end and the sending end in D2D, and the first information comprises a sidelink shared channel Cyclic Redundancy Check (CRC) check result or New Data Indication (NDI) information;

and the sending end sends a wireless link detection reference signal to the receiving end by using the first reference signal resource.

11. The method of claim 10, further comprising:

and the sending end sends a side link shared channel to the receiving end.

12. The method of claim 10, further comprising:

the sending end sends a side link control channel to the receiving end, the side link control channel carries the NDI information, and the NDI information is used for indicating that data is newly transmitted data or indicating that the data is retransmitted data;

wherein, the sending end uses the first reference signal resource to send the radio link detection reference signal to the receiving end, and the method includes:

if the NDI information is used for indicating that the data is newly transmitted data, the sending end cancels the sending of the radio link measurement reference signals in a preset time window, or cancels the sending of one or more radio link measurement reference signals behind the sidelink control channel;

or, if the NDI information is used to indicate that the data is retransmission data, the transmitting end transmits a radio link detection reference signal to the receiving end using the first reference signal resource.

13. A method of link detection in device-to-device D2D, comprising:

the method comprises the steps that a first device determines configuration of a first reference signal resource, the first reference signal resource and first information are used for measuring the quality of a side link, the side link is a wireless link between a receiving end and a sending end in the D2D, and the first information comprises a side link shared channel Cyclic Redundancy Check (CRC) check result or New Data Indication (NDI) information;

the first device sends first indication information, where the first indication information is used to indicate configuration of the first reference signal resource.

14. The method of claim 13, further comprising:

the first device receives failure information from the receiving end, where the failure information is used to indicate that the sidelink 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;

the first equipment establishes a first forwarding link with the receiving end, and the first forwarding link is used for transmitting data between the first equipment and the receiving end;

and the first equipment establishes a second forwarding link with the sending end, and the second forwarding link is used for transmitting data between the first equipment and the sending end.

15. The method of claim 14, further comprising:

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

the first device releases the first forwarding link;

the first device releases the second forwarding link.

16. An apparatus for link detection in device-to-device D2D, comprising:

a transceiver module, configured to obtain first indication information, where the first indication information is used to indicate 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 measurement reference signal is used to measure quality of a sidelink, and the sidelink is a radio link between the apparatus and a transmitting end in D2D;

and the processing module is further configured to perform sidelink quality measurement according to the first reference signal resource and first information, where the first information includes a sidelink shared channel Cyclic Redundancy Check (CRC) check result, or New Data Indication (NDI) information.

17. The apparatus of claim 16, wherein the transceiver module is further configured to:

receiving a side link shared channel from the transmitting end;

correspondingly, the processing module is configured to perform sidelink quality measurement according to the first reference signal resource, and specifically includes:

or, if the side link shared channel CRC is checked incorrectly, the transceiver module is called to send out an out-of-step indication, and the measurement of the first radio link measurement reference signal is skipped;

or, if the side link shared channel CRC is checked incorrectly, measuring the wireless link measurement reference signal transmitted by the first reference signal resource, and calling the transceiver module to send the measurement result.

18. The apparatus of claim 17, wherein the first rlc srs satisfies a predetermined condition: the first radio link measurement reference signal is a reference signal transmitted in a preset time window after the sidelink shared channel,

19. The apparatus of claim 16, wherein the transceiver module is further configured to:

receiving a sidelink control channel from the transmitting end;

the processing module is further configured to acquire the NDI information, where the NDI information is used to indicate that data is newly transmitted data or indicate that data is retransmitted data;

if the NDI indication data is newly transmitted data, calling the transceiver module to send a synchronization indication, and skipping measurement of a second radio link measurement reference signal, wherein the second radio link measurement reference signal meets a preset condition;

or, if the NDI indication data is retransmission data, invoking the transceiver module to send an out-of-synchronization indication, and skipping measurement of a second reference signal resource;

or, if the NDI indicates that the data is retransmission data, measuring a radio link sounding reference signal transmitted through the first reference signal resource, and transmitting a measurement result.

20. The apparatus of claim 19, wherein the second rlc rs signal satisfying a predetermined condition is: the second radio link measurement reference signal is a reference signal transmitted in a preset time window after the sidelink control channel,

21. The apparatus of any of claims 16 to 20, wherein the processing module is further configured to: determining that the sidelink failed;

the transceiver module is further configured to: sending failure information to the first device, the failure information indicating the sidelink failure, the failure information including one or more of: the identification information of the sending end, the identification information of the service transmitted by the device and the sending end, and the priority information of the service.

22. The apparatus of claim 21, wherein the transceiver module is further configured to: and transmitting data with the transmitting end through the first equipment.

23. The apparatus according to claim 22, wherein the transceiver module is configured to perform data transmission with the sending end through the first device, and specifically includes:

establishing a first forwarding link with the first device, the first forwarding link being used for transmitting data between the first device and the apparatus;

transmitting data to the first device over the first forwarding link;

24. The apparatus of claim 23, wherein the processing module is further configured to:

determining that the sidelink has recovered from failure;

correspondingly, the transceiver module is further configured to: and sending a link release request to the first device, wherein the link release request is used for informing the first device to release the first forwarding link and the second forwarding link.

25. An apparatus for link detection in device-to-device D2D, comprising:

a transceiver module, configured to obtain first indication information, where the first indication information is used to indicate a first reference signal resource, the first reference signal resource is used to transmit a radio link measurement reference signal, and the first information and the first reference signal resource are used to perform a sidelink quality measurement, where the radio link measurement reference signal is used to measure a quality of a sidelink, the sidelink is a radio link between a receiving end and the apparatus in D2D, and the first information includes a sidelink shared channel cyclic redundancy check CRC result, or new data indication NDI information;

the transceiver module is further configured to send a radio link detection reference signal to the receiving end using the first reference signal resource.

26. The apparatus of claim 25, wherein the transceiver module is further configured to: and transmitting the side link shared channel to the receiving end.

27. The apparatus of claim 25, wherein the transceiver module is further configured to: sending a sidelink control channel to the receiving end, wherein the sidelink control channel carries the NDI information, and the NDI information is used for indicating that the data is newly transmitted data or indicating that the data is retransmitted data;

wherein, the transceiver module is configured to send a radio link detection reference signal to the receiving end by using the first reference signal resource, and specifically includes:

28. An apparatus for link detection in device-to-device D2D, comprising:

a processing module, configured to determine configuration of a first reference signal resource, where the first reference signal resource and first information are used to perform measurement of a sidelink quality, where the sidelink is a radio link between a receiving end and a transmitting end in the D2D, and the first information includes a sidelink shared channel cyclic redundancy check, CRC, check result, or new data indicator, NDI, information;

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

29. The apparatus of claim 28, wherein the transceiver module is further configured to:

correspondingly, the processing module is further configured to: establishing a first forwarding link with the receiving end, wherein the first forwarding link is used for transmitting data between the device and the receiving end; and establishing a second forwarding link with the sending end, wherein the second forwarding link is used for transmitting data between the device and the sending end.

30. The apparatus of 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 for the device to release the first forwarding link and the second forwarding link established by the device;

correspondingly, the processing module is further configured to: releasing the first forwarding link; releasing the second forwarding link.