Method, device and computer storage medium for handling radio link failure

Abstract

The embodiments of the present disclosure disclose a wireless link failure processing method and device and a computer storage medium, and the method comprises: determining that a sidelink, SL, unicast connection between one or more second user equipment, UE, and a wireless link failure; and performing SL data transmission with the second UE through a third UE.

Description

[0001] This disclosure claims priority to application No. 201980003398.5, filed with the State Intellectual Property Office of China on January 2, 2020, entitled "Method, Apparatus and Computer Storage Medium for Handling Wireless Link Failure", which further claims priority to PCT International Application No. PCT / CN2019 / 122482, filed on December 2, 2019, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to communication technology, and more particularly to a method, apparatus, and computer storage medium for handling wireless link failures. Background Technology

[0003] To support direct communication between User Equipment (UE) and UE, the Sidelink (SL) communication method was introduced. Sometimes, Sidelink is also referred to as a secondary link or side link.

[0004] When a direct link unicast connection is transmitted, the destination UE is unique, meaning it is meaningless to other UEs besides the destination UE. Therefore, data transmission is interrupted after the direct link unicast connection fails. Summary of the Invention

[0005] This disclosure provides a method, apparatus, and computer storage medium for handling wireless link failures.

[0006] According to a first aspect of the present disclosure, a method for handling wireless link failure is provided, performed by a first user equipment (UE), the method comprising: The direct link (SL) unicast connection radio link between the second UE and the second UE has been determined to be faulty. Based on the response information received from the third UE, a direct link SL connection is established with the third UE, wherein the response message is a response message to the connection message sent by the first UE; The third UE and the second UE perform SL data transmission.

[0007] In the above scheme, the SL connection between the third UE and the second UE is established after the third UE receives the connection message; or, the SL connection between the third UE and the second UE is established before the third UE receives the connection message.

[0008] In the above scheme, the connection message is sent by the first UE via broadcast.

[0009] In the above scheme, the response message carries the SL2 identifier of the third UE and the SL2 identifier of the currently relayed second UE.

[0010] In the above scheme, the connection message further includes: The SL layer 2 identifier of the first UE; The SL layer 2 identifier of the second UE; The SL data contains Quality of Service (QoS) information.

[0011] In the above scheme, the QoS information includes at least a QoS identifier; or, the QoS information includes a QoS identifier and parameters corresponding to the QoS identifier.

[0012] In the above scheme, the connection message is a Radio Resource Control (RRC) reconstruction message.

[0013] According to a second aspect of the present disclosure, a method for handling wireless link failure is provided, executed by a third UE, the method comprising: Send a response message, which is an acknowledgment message of the connection message sent by the first UE, indicating that the SL unicast connection radio link between the first UE and the second UE has failed; Establish an SL connection with the first UE; The SL connection is used to transmit SL data between the first UE and the second UE.

[0014] In the above scheme, the SL connection between the third UE and the second UE is established after the third UE receives the connection message; or, the SL connection between the third UE and the second UE is established before the third UE receives the connection message.

[0015] In the above scheme, sending the response message includes: Based on the connection message, it is determined whether the SL unicast connection radio link between the second UE and the third UE can meet the transmission requirements of the SL data. When it is determined that the transmission requirements of the SL data can be met, the response message is sent to the first UE.

[0016] In the above scheme, the response message carries the SL2 identifier of the third UE and the SL2 identifier of the currently relayed second UE.

[0017] In the above scheme, the connection message is sent by the first UE via broadcast.

[0018] In the above scheme, the connection message further includes: The SL layer 2 identifier of the first UE; The SL layer 2 identifier of the second UE; The QoS information of the SL data.

[0019] In the above scheme, the QoS information includes at least a QoS identifier; or, the QoS information includes a QoS identifier and parameters corresponding to the QoS identifier.

[0020] In the above scheme, the connection message is an RRC reconstruction message.

[0021] According to a third aspect of the present disclosure, a wireless link failure processing apparatus is provided, applied to a first UE, comprising: The determining unit is configured to determine that the SL unicast connection radio link between the second UE and the second UE has failed. The first processing unit is configured to establish a direct link (SL) connection with the third UE based on response information received from the third UE, wherein the response message is a response message to the connection message sent by the first UE; and to perform SL data transmission with the second UE through the third UE.

[0022] According to a fourth aspect of the present disclosure, a wireless link failure processing apparatus is provided, applied to a third UE, the apparatus comprising: The second processing unit is configured to establish an SL connection with the first UE after sending a response message; The communication unit is configured to send the response message, which is a response message to the connection message sent by the first UE, indicating that the SL unicast connection radio link between the first UE and the second UE has failed; and is further configured to transmit SL data between the first UE and the second UE through the SL connection after establishing an SL connection with the first UE.

[0023] According to a fifth aspect of the present disclosure, a wireless link failure processing apparatus is provided, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to implement any of the aforementioned wireless link failure handling methods applied to the first UE side technical solution by executing the executable instructions.

[0024] According to a sixth aspect of the present disclosure, a wireless link failure processing apparatus is provided, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to implement any of the aforementioned wireless link failure handling methods applied to the third UE side technical solution by executing the executable instructions.

[0025] According to a seventh aspect of the present disclosure, a computer storage medium is provided, wherein executable instructions are stored in the computer storage medium, and after being executed by a processor, the executable instructions are able to implement any of the aforementioned wireless link failure handling methods applied to the first UE side technical solution.

[0026] According to an eighth aspect of the present disclosure, a computer storage medium is provided, wherein executable instructions are stored in the computer storage medium, and after being executed by a processor, the executable instructions are able to implement any of the aforementioned wireless link failure handling methods applied to the third UE-side technical solutions.

[0027] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: The SL unicast connection radio link between the first UE and the second UE is determined to be invalid; SL data transmission is performed between the first UE and the second UE via the third UE; compared to doing nothing when the SL unicast connection radio link between the first UE and the second UE is invalid, using the third UE as a relay device to forward the SL data between the first UE and the second UE can achieve the purpose of restoring data transmission through the relay UE after the SL unicast connection radio link fails.

[0028] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0030] Figure 1 This is a schematic diagram illustrating the structure of a wireless communication system according to an exemplary embodiment; Figure 2 This is a schematic diagram of the protocol stack for a direct link communication method according to an exemplary embodiment; Figure 3 This is a flowchart illustrating a wireless link failure handling method according to an exemplary embodiment. Figure 1 ; Figure 4 This is a flowchart illustrating a wireless link failure handling method according to an exemplary embodiment. Figure 2 ; Figure 5 This is a flowchart illustrating the process of forwarding data via a relay UE according to an exemplary embodiment; Figure 6 This is a block diagram of a wireless link failure processing apparatus according to an exemplary embodiment. Figure 1 ; Figure 7 This is a block diagram of a wireless link failure processing apparatus according to an exemplary embodiment. Figure 2 ; Figure 8 This is a block diagram illustrating an apparatus 800 for handling wireless link failures according to an exemplary embodiment; Figure 9 This is a block diagram illustrating an apparatus 900 for handling wireless link failures according to an exemplary embodiment. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0032] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a,” “an,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0033] It should be understood that although the terms first, second, third, etc., may be used to describe various information in embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of embodiments of this disclosure, and similarly, second information may also be referred to as first information. Depending on the context, the words “if” and “suppose” as used herein may be interpreted as “when”, “when”, or “in response to a determination”.

[0034] Please refer to Figure 1 This illustration shows a schematic diagram of the structure of a wireless communication system provided in an embodiment of this disclosure. Figure 1As shown, the wireless communication system is a communication system based on cellular mobile communication technology. The wireless communication system may include: a number of terminals 11 and a number of base stations 12.

[0035] Terminal 11 can be a device that provides voice and / or data connectivity to a user. Terminal 11 can communicate with one or more core networks via a Radio Access Network (RAN). Terminal 11 can be an Internet of Things (IoT) terminal, such as a sensor device, a mobile phone (or "cellular" phone), and a computer with an IoT terminal. For example, it can be a fixed, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted device. Examples include a station (STA), subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, or user equipment (UE). Alternatively, terminal 11 can also be a device in an unmanned aerial vehicle (UAV). Alternatively, terminal 11 can also be a vehicle-mounted device, such as a vehicle computer with wireless communication capabilities, or a wireless communication device connected to an external vehicle computer. Alternatively, terminal 11 can also be a roadside device, such as a street light, traffic light, or other roadside device with wireless communication capabilities.

[0036] Base station 12 can be a network-side device in a wireless communication system. This wireless communication system can be a 4G system (also known as Long Term Evolution, LTE); or it can be a 5G system (also known as New Radio, NR, or 5G NR); or it can be the next generation after 5G. In this case, the access network in the 5G system can be called NG-RAN (New Generation-Radio Access Network) or a Machine-Type Communication (MTC) system.

[0037] In this embodiment, base station 12 can be an evolved NB (eNB) used in a 4G system. Alternatively, base station 12 can also be a gNB (gNB) using a centralized-distributed architecture in a 5G system. When base station 12 adopts a centralized-distributed architecture, it typically includes a Central Unit (CU) and at least two Distributed Units (DUs). The Central Unit is equipped with a protocol stack of Packet Data Convergence Protocol (PDCP), Radio Link Control (RLC), and Media Access Control (MAC) layers; the Distributed Units are equipped with a Physical (PHY) layer protocol stack. This disclosure does not limit the specific implementation of base station 12.

[0038] Base station 12 and terminal 11 can establish a wireless connection via a wireless air interface. In different implementations, the wireless air interface is a wireless air interface based on the fourth-generation mobile communication network technology (4G) standard; or, the wireless air interface is a wireless air interface based on the fifth-generation mobile communication network technology (5G) standard, such as a new air interface; or, the wireless air interface can also be a wireless air interface based on a next-generation mobile communication network technology standard based on 5G.

[0039] In some embodiments, terminals 11 can also establish E2E (End to End) connections. Examples include V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure), and V2P (Vehicle to Pedestrian) communication scenarios in Vehicle to Everything (V2X) communication.

[0040] In some embodiments, the wireless communication system described above may further include a network management device 13.

[0041] Several base stations 12 are connected to network management device 13. Network management device 13 can be a core network device in a wireless communication system, such as a Mobility Management Entity (MME) in an Evolved Packet Core (EPC). Alternatively, it can be other core network devices, such as a Serving Gateway (SGW), a Public Data Network Gateway (PGW), a Policy and Charging Rules Function (PCRF), or a Home Subscriber Server (HSS). The implementation of network management device 13 is not limited in this embodiment.

[0042] In the 4G era, to support direct communication between UEs (User Equipments), the Sidelink communication method was introduced. The protocol stack for Sidelink communication is as follows: Figure 2 As shown, the interface between UEs is a PC-5 interface.

[0043] Direct link transmission uses source and destination identifiers at the MAC layer for addressing, and no connection needs to be established before transmission. When transmitting direct link data, a direct link layer 2 source and destination identifier is added to the MAC layer Protocol Data Unit (PDU) to achieve addressing.

[0044] In the 5G era, to support the transmission characteristics and Quality of Service (QoS) of different services, unicast / broadcast / multicast transmission mechanisms have been introduced. Unicast transmission supports feedback, RadioLink Monitoring (RLM) measurements, transmit power control, and connection control. Each unicast connection corresponds to a pair of source direct link Layer 2 identifiers and destination direct link Layer 2 identifiers. Before unicast transmission, UEs need to establish a unicast Radio Resource Control (RRC) connection. UEs can send PC5 RRC messages to convey UE capabilities and radio bearer configurations, including the Radio Link Control (RLC) transmission mode, sequence number length, logical channel identifier, etc. After the unicast connection is established, similar to Uu communication, the physical layer indicates to the higher layers whether synchronization has been lost based on the measurement of the direct link reference signal. When synchronization is lost continuously for a period of time, the RRC layer will announce that the corresponding direct link unicast connection has failed, delete the corresponding Layer 2 destination identifier, and inform the higher layers that the corresponding Layer 2 destination identifier radio link has failed.

[0045] When transmitting via a direct link unicast connection, the destination UE is unique, meaning it is meaningless to other UEs besides the destination UE. Therefore, after a direct link unicast connection radio link failure occurs, data transmission cannot be resumed by re-establishing a direct link unicast connection with other UEs, resulting in data transmission interruption.

[0046] Based on the aforementioned wireless communication system, this disclosure proposes various embodiments of a method to restore direct link unicast connection data transmission and increase direct link coverage when the direct link unicast connection fails.

[0047] Figure 3 This is a flowchart illustrating a wireless link failure handling method according to an exemplary embodiment. Figure 1 ,like Figure 3 As shown, the method for handling radio link failures is applied in a first user equipment (UE) and includes the following steps: In step S11, it is determined that the direct link (SL) unicast connection radio link between the user equipment (UE) and one or more second user equipments (UEs) has failed; In step S12, SL data transmission is performed between the third UE and the second UE.

[0048] The second UE is a UE other than the first UE and the third UE.

[0049] The number of the second UE can be one or more.

[0050] In other words, the SL unicast radio link between the first UE and multiple second UEs may fail at the same time.

[0051] When the SL unicast connection radio link between the first UE and a second UE fails in step S11, the second UE in step S12 refers to the unique second UE in step S11.

[0052] When the SL unicast connection radio link between the first UE and multiple second UEs fails in step S11, the second UE in step S12 refers to one of the multiple second UEs in step S11, and this second UE is capable of establishing an SL unicast connection with the third UE.

[0053] Thus, it is determined that the SL unicast connection radio link between the SL unicast connection and one or more second UEs has failed; SL data transmission is performed between the third UE and the second UE; compared to doing nothing when the SL unicast connection radio link fails, using the third UE as a relay device to forward the SL data between the first UE and the second UE supported by it can restore the SL unicast connection data transmission when the SL unicast connection radio link fails, thereby increasing the coverage of the direct link.

[0054] In some implementations, the method further includes sending a connection message to the third UE indicating that the SL unicast connection radio link with the second UE has failed.

[0055] In this way, the third UE can learn about the failure information of the SL unicast connection radio link between the first UE and the second UE through the connection message, and then detect whether it can provide relay service for the first UE and the second UE.

[0056] In some embodiments, SL data transmission between the third UE and the second UE includes: Receive the response message returned by the third UE based on the connection message to establish an SL connection with the third UE; wherein, an SL connection is established between the third UE and the second UE; The third UE and the second UE perform SL data transmission.

[0057] In this way, after receiving the response message returned by the third UE based on the connection message, the third UE is used as a relay device to send the SL data to the second UE, avoiding the problem that the SL data will not be successfully transmitted due to the selection of an unsuitable relay UE.

[0058] It should be noted that the third UE has established an SL unicast direct connection with the second UE before sending a response message to the first UE. Specifically, the third UE establishes an SL unicast direct connection with the second UE after receiving the connection message. Alternatively, the third UE has established an SL unicast direct connection with the second UE before receiving the connection message.

[0059] In the above scheme, the connection message further includes: The current UE's direct link layer 2 identifier; The direct link layer 2 identifier of the second UE; The QoS information of the SL data; Here, the current UE is the first UE.

[0060] This allows the third UE to determine whether it can provide relay services to the first and second UEs based on the information carried in the connection message.

[0061] In some embodiments, the QoS information includes at least a QoS identifier.

[0062] For example, when the QoS identifier of the SL data belongs to the standardized QoS identifier, the QoS information is the QoS identifier.

[0063] This allows the third UE to determine the QoS requirements of the SL data based on the QoS identifier, and thus determine whether it has the capability to forward the SL data between the first UE and the second UE.

[0064] In some embodiments, the QoS information includes at least a QoS identifier and parameters corresponding to the QoS identifier.

[0065] For example, when the QoS identifier of the SL data is a private QoS identifier, the QoS information includes the QoS identifier and the parameters corresponding to the QoS identifier.

[0066] In this way, the third UE can determine the QoS requirements of the SL data based on the QoS identifier and the parameters corresponding to the QoS identifier, such as performance index parameters, and thus determine whether it has the ability to forward the SL data between the first UE and the second UE.

[0067] In some embodiments, the connection message includes an identifier indicating that the SL unicast connection radio link with a second UE has failed.

[0068] This allows the third UE to easily obtain information about the failure of a single SL unicast direct radio link through connection messages, and also enables it to quickly determine whether the third UE supports the object of that SL unicast direct radio link.

[0069] In some embodiments, the connection message includes N identifiers indicating N unicast connection radio link failures (SLs) corresponding to N second UEs, and each identifier corresponds to one unicast connection radio link failure (SL). Here, N is a positive integer.

[0070] For example, when the SL unicast connection radio link between the first UE and multiple second UEs fails, the connection message carries radio link failure information of each SL unicast direct radio link in groups. Each group of radio link failure information includes the direct link layer 2 identifier of the first UE; the direct link layer 2 identifier of the second UE; and the QoS information of the SL data.

[0071] In this way, the third UE can obtain the wireless link failure information of multiple SL unicast direct wireless links at one time through the connection message, and can identify the specific failure information of each SL unicast direct wireless link by identifying each group of wireless link failure information, thereby facilitating the search for the objects of SL unicast direct wireless links supported by the third UE.

[0072] In some embodiments, the connection message includes M identifiers for indicating N unicast connection radio link failures (SLs) corresponding to N second UEs, and each identifier corresponds to one unicast connection radio link failure (SL) or multiple unicast connection radio link failures (SLs).

[0073] For example, N LS correspond to M identifiers, where M is less than N. Some of these LS correspond to one LS, while others correspond to multiple LS.

[0074] In this way, the third UE can obtain the wireless link failure information of multiple SL unicast direct wireless links at one time through the connection message, and can identify the specific failure information of each SL unicast direct wireless link by identifying each group of wireless link failure information, thereby quickly finding the objects of SL unicast direct wireless links supported by the third UE.

[0075] In some embodiments, the connection message indicating the failure of the SL unicast connection wireless link is sent via broadcast.

[0076] This helps to quickly locate the third UE as a relay device.

[0077] For example, the connection message is a Radio Resource Control (RRC) reconstruction message. This allows for full utilization of the RRC reconstruction message, saving signaling overhead.

[0078] Of course, the connection message can also be a message that all UEs can support or recognize.

[0079] The technical solution described in this disclosure determines that the direct link SL unicast connection wireless link between the first UE and one or more second UEs has failed; SL data transmission is performed between the second UE and the third UE; compared to not doing anything when the SL unicast connection wireless link between the first UE and the second UE fails, using the third UE as a relay device to forward the SL data between the first UE and the second UE can achieve the purpose of restoring data transmission through the relay UE after the SL unicast connection wireless link fails.

[0080] Figure 4 This is a flowchart illustrating a wireless link failure handling method according to an exemplary embodiment. Figure 2 ,like Figure 4 As shown, the method for handling wireless link failures is applied to a third UE and includes the following steps.

[0081] In step S21, SL unicast wireless links are established with the first UE and the second UE respectively; In step S22, SL data transmission between the first UE and the second UE is sent through the SL unicast wireless link.

[0082] Thus, by acting as a relay UE to forward SL data between the first UE and the second UE, the purpose of restoring data transmission can be achieved after the failure of the SL unicast connection radio link between the first UE and the second UE.

[0083] In some embodiments, prior to establishing an SL unicast connection radio link with the first UE, the method further includes: Receive a connection message sent by the first UE indicating that the SL unicast connection radio link between the first UE and the second UE has failed; A response message is sent to the first UE based on the connection message; wherein, an SL connection is established between the third UE and the second UE.

[0084] This avoids the problem of data transmission failure due to inappropriate timing of sending response messages.

[0085] In some embodiments, before sending a response message to the first UE based on the connection message, the method further includes: Based on the connection message, it is determined whether the SL unicast connection radio link with the second UE can meet the transmission requirements of the SL data. When it is determined that the transmission requirements of the SL data can be met, a response message is sent to the first UE.

[0086] For example, the QoS requirements of the SL data are determined based on the QoS information in the connection message; the channel status of the SL unicast connection radio link with the second UE is used to determine whether the QoS requirements of the SL data can be met; when it is determined that the QoS requirements of the SL data can be met, a response message is sent to the first UE.

[0087] In this way, the problem of failure to restore data transmission due to the inability to forward SL data between the first UE and the second UE can be avoided.

[0088] In the above scheme, the connection message further includes: The direct link layer 2 identifier of the first UE; The direct link layer 2 identifier of the second UE; The QoS information of the SL data.

[0089] In this way, the third UE can determine the first UE and the second UE that experienced the SL unicast connection radio link failure based on the information also carried in the connection message, and whether it can provide relay services to the first UE and the second UE.

[0090] In the above scheme, the QoS information includes at least a QoS identifier; or The QoS information includes at least a QoS identifier and parameters corresponding to the QoS identifier.

[0091] In the above scheme, the connection message includes an identifier indicating that the SL unicast connection radio link with a second UE has failed; or The connection message includes N identifiers for indicating N unicast connection radio link failures (SLs) between the N second UEs, and each identifier corresponds to a unicast connection radio link failure (SL).

[0092] This allows the third UE to determine the QoS requirements of the SL data based on the connection message from the first UE, and thus determine whether it has the capability to forward the SL data between the first UE and the second UE.

[0093] In some embodiments, the connection message may be a connection message sent by the first UE via broadcast. This helps to quickly locate the third UE acting as a relay device.

[0094] For example, the connection message is an RRC reconstruction message. In this way, the RRC reconstruction message can be fully utilized, saving signaling overhead.

[0095] In the above scheme, the response message carries the direct link layer 2 identifier of the third UE and the direct link layer 2 identifier of the currently relayed second UE.

[0096] Thus, when the connection message of the first UE indicates that the SL unicast connection radio link between the first UE and multiple second UEs has failed, the first UE is informed of the second UEs that it can support relaying through this response message, so as to prevent the first UE from failing to restore data transmission due to forwarding SL data that the third UE does not support through the third UE.

[0097] The technical solution described in this disclosure allows the third UE to act as a relay device to forward SL data from the first UE and the second UE when the unicast connection radio link fails, thereby achieving the goal of restoring data transmission through the relay UE after the SL unicast connection radio link fails.

[0098] Figure 5 This is a flowchart illustrating a process for forwarding data via a relay UE according to an exemplary embodiment, the process including the following steps.

[0099] Step 501: UE1 and UE2 establish an SL unicast connection, and the QoS identifier of the SL data used for transmission is 4.

[0100] The QoS identifier is 4, which is a non-standard QoS identifier. Its corresponding performance parameters include: data rate of 1Mb / s and latency of 50ms.

[0101] Step 502: UE3 and UE2 have established an SL unicast connection.

[0102] Step 503: When the SL unicast connection between UE1 and UE2 fails due to a radio link failure, UE1 sends a connection message.

[0103] The connection message includes the following information: Source UE identifier: Layer 2 identifier of UE1's direct link; The identifier of the failed UE: the direct link layer 2 identifier of UE2; QoS information: Rate 1MB / s, latency 50ms.

[0104] Step 504: After UE3 receives the connection message sent by UE1, it finds that an SL unicast connection has been established with UE2; based on QoS and channel conditions, it determines that it can support relay service transmission, and then sends a connection response message to UE1.

[0105] The connection response message includes the following information: The identifier of the failed UE: the direct link layer 2 identifier of UE2; Source UE identifier: The direct link layer 2 identifier of UE3.

[0106] Step 505: After receiving the connection response message from UE3, UE1 establishes an SL unicast connection with UE3 and sends data and control signaling to UE2 through UE3 as a relay.

[0107] In the scheme described in this embodiment, when the SL unicast connection wireless link between UE1 and UE2 fails, UE3 acts as a relay device to forward the SL data between UE1 and UE2, which enables the SL unicast connection data transmission to be restored through UE3 after the SL unicast connection wireless link between UE1 and UE2 fails.

[0108] It should be noted that this process and QoS information are illustrative and can be set or adjusted according to actual conditions or design requirements.

[0109] Figure 6 This is a block diagram of a wireless link failure processing device according to an exemplary embodiment. Figure 1 The wireless link failure handling device is applied to the first UE side, as shown in the reference. Figure 6 The device includes a determining unit 10 and a first processing unit 20.

[0110] The determining unit 10 is configured to determine that the direct link (SL) unicast connection radio link between the user equipment (UE) and one or more second user equipments (UEs) has failed. The first processing unit 20 is configured to perform SL data transmission with the second UE through the third UE.

[0111] In the above scheme, the first processing unit 20 is further configured to send a connection message to the third UE indicating that the SL unicast connection radio link between the third UE and the second UE has failed.

[0112] In the above scheme, the first processing unit 20 is further configured to: send the connection message indicating the failure of the SL unicast connection wireless link via broadcast.

[0113] In the above scheme, the first processing unit 20 is configured as follows: Receive the response message returned by the third UE based on the connection message to establish an SL connection with the third UE; wherein, an SL connection is established between the third UE and the second UE; The third UE and the second UE perform SL data transmission.

[0114] In the above scheme, the connection message further includes: The current UE's direct link layer 2 identifier; The direct link layer 2 identifier of the second UE; The SL data contains Quality of Service (QoS) information.

[0115] In the above scheme, the QoS information includes at least a QoS identifier; or The QoS information includes at least a QoS identifier and parameters corresponding to the QoS identifier.

[0116] In the above scheme, the connection message includes an identifier indicating that the SL unicast connection radio link with a second UE has failed; or The connection message includes N identifiers for indicating N unicast connection radio link failures (SLs) between the N second UEs, and each identifier corresponds to a unicast connection radio link failure (SL).

[0117] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0118] In practical applications, the specific structures of the aforementioned determining unit 10 and the first processing unit 20 can be implemented by the wireless link failure processing device or the central processing unit (CPU), microprocessor (MCU), digital signal processor (DSP), or programmable logic controller (PLC) in the first UE to which the wireless link failure processing device belongs.

[0119] The wireless link failure handling device described in this embodiment can be located on the first UE side.

[0120] Those skilled in the art should understand that the functions of each processing module in the wireless link failure processing apparatus of this disclosure embodiment can be understood with reference to the relevant description of the wireless link failure processing method applied to the first UE side. Each processing module in the wireless link failure processing apparatus of this disclosure embodiment can be implemented by an analog circuit that implements the functions described in the embodiments of this disclosure, or by running software that performs the functions described in the embodiments of this disclosure on a terminal.

[0121] The wireless link failure processing apparatus described in this embodiment can, after an SL unicast connection wireless link failure occurs, use a third UE as a relay device to forward the SL data of the first UE and the second UE when the unicast connection wireless link fails, thereby achieving the purpose of restoring data transmission through the relay UE after an SL unicast connection wireless link failure occurs.

[0122] Figure 7 This is a block diagram of a wireless link failure processing device according to an exemplary embodiment. Figure 2 The wireless link failure handling device is applied to the third UE side; see reference. Figure 7 The device includes a second processing unit 30 and a communication unit 40.

[0123] The second processing unit 30 is configured to establish SL unicast connection radio links with the first UE and the second UE respectively; The communication unit 40 is configured to transmit SL data between the first UE and the second UE via the SL unicast wireless link.

[0124] In the above scheme, the communication unit 40 is further configured as follows: Receive a connection message sent by the first UE indicating that the SL unicast connection radio link between the first UE and the second UE has failed; A response message is sent to the first UE based on the connection message; wherein, an SL connection is established between the third UE and the second UE.

[0125] In the above scheme, the communication unit 40 is further configured as follows: Based on the connection message, it is determined whether the SL unicast connection radio link with the second UE can meet the transmission requirements of the SL data. When it is determined that the transmission requirements of the SL data can be met, a response message is sent to the first UE.

[0126] In the above scheme, the connection message is a connection message sent by the first UE via broadcast.

[0127] In the above scheme, the connection message further includes: The direct link layer 2 identifier of the first UE; The direct link layer 2 identifier of the second UE; The QoS information of the SL data.

[0128] In the above scheme, the QoS information includes at least a QoS identifier; or The QoS information includes at least a QoS identifier and parameters corresponding to the QoS identifier.

[0129] In the above scheme, the connection message includes an identifier indicating that the SL unicast connection radio link with a second UE has failed; or The connection message includes N identifiers for indicating N unicast connection radio link failures (SLs) between the N second UEs, and each identifier corresponds to a unicast connection radio link failure (SL).

[0130] In the above scheme, the connection message is an RRC reconstruction message.

[0131] In the above scheme, the response message carries the direct link layer 2 identifier of the third UE and the direct link layer 2 identifier of the currently relayed second UE.

[0132] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0133] In practical applications, the specific structures of the second processing unit 30 and the communication unit 40 can be implemented by the CPU, MCU, DSP or PLC of the wireless link failure processing device or the third UE to which the wireless link failure processing device belongs.

[0134] The wireless link failure handling device described in this embodiment can be located on the third UE side.

[0135] Those skilled in the art should understand that the functions of each processing module in the wireless link failure processing apparatus of this disclosure embodiment can be understood with reference to the relevant description of the wireless link failure processing method applied to the third UE side. Each processing module in the wireless link failure processing apparatus of this disclosure embodiment can be implemented by an analog circuit that implements the functions described in the embodiments of this disclosure, or by running software that performs the functions described in the embodiments of this disclosure on a terminal.

[0136] The wireless link failure processing apparatus described in this embodiment can act as a relay device to forward SL data of the first UE and the second UE when the unicast connection wireless link fails, and can achieve the purpose of restoring data transmission by relaying the UE after the SL unicast connection wireless link fails.

[0137] Figure 8This is a block diagram illustrating an apparatus 800 for implementing wireless link failure processing according to an exemplary embodiment. For example, apparatus 800 may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, fitness equipment, personal digital assistant, etc.

[0138] Reference Figure 8 The device 800 may include one or more of the following components: a processing component 802, a memory 804, a power component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0139] Processing component 802 typically controls the overall operation of device 800, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 802 may include one or more processors 820 to execute instructions to perform all or part of the steps of the methods described above. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0140] Memory 804 is configured to store various types of data to support the operation of device 800. Examples of such data include instructions for any application or method operating on device 800, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random-Access Memory (SRAM), Electrically Erasable Programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0141] The power supply component 806 provides power to the various components of the device 800. The power supply component 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power to the device 800.

[0142] Multimedia component 808 includes a screen that provides an output interface between the device 800 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a Touch Panel, the screen may be implemented as a touchscreen to receive input signals from the user. The Touch Panel includes one or more touch sensors to sense touches, swipes, and gestures on the Touch Panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the device 800 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0143] Audio component 810 is configured to output and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when device 800 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

[0144] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0145] Sensor assembly 814 includes one or more sensors for providing state assessments of various aspects of device 800. For example, sensor assembly 814 may detect the on / off state of device 800, the relative positioning of components such as the display and keypad of device 800, changes in the position of device 800 or a component of device 800, the presence or absence of user contact with device 800, the orientation or acceleration / deceleration of device 800, and temperature changes of device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include an optical sensor, such as a complementary metal-oxide-semiconductor (CMOS) or charge-coupled device (CCD) image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, a gyroscope, a magnetometer, a pressure sensor, or a temperature sensor.

[0146] Communication component 816 is configured to facilitate wired or wireless communication between device 800 and other devices. Device 800 can access wireless networks based on communication standards, such as Wi-Fi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wide Band (UWB), Bluetooth (BT), and other technologies.

[0147] In an exemplary embodiment, the device 800 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described wireless link failure handling method applied to the user equipment side.

[0148] In an exemplary embodiment, a non-transitory computer storage medium including executable instructions is also provided, such as a memory 804 including executable instructions, which can be executed by a processor 820 of the device 800 to perform the above-described method. For example, the non-transitory computer storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0149] Figure 9 This is a block diagram illustrating an apparatus 900 for handling wireless link failures according to an exemplary embodiment. For example, apparatus 900 may be provided as a server. (Refer to...) Figure 9 The apparatus 900 includes a processing component 922, which further includes one or more processors, and memory resources represented by a memory 932 for storing instructions, such as application programs, that can be executed by the processing component 922. The application programs stored in the memory 932 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processing component 922 is configured to execute instructions to perform the aforementioned wireless link failure handling method applied to the base station side.

[0150] Device 900 may also include a power supply component 926 configured to perform power management of device 900, a wired or wireless network interface 950 configured to connect device 900 to a network, and an input / output (I / O) interface 958. Device 900 may operate on an operating system stored in memory 932, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, or similar.

[0151] The technical solutions described in the embodiments of this disclosure can be combined arbitrarily without conflict.

[0152] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0153] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for handling wireless link failure, executed by a first user equipment (UE), the method comprising: The direct link SL unicast connection radio link between the second UE and the second UE has been determined to be faulty. Send a connection message to a third UE, wherein the connection message includes the Quality of Service (QoS) information of the SL unicast connection radio link between the first UE and the second UE; The system receives a response message sent by the third UE, which is sent when the third UE determines, at least based on the QoS information, that the SL unicast radio link between the second UE and the third UE supports relay service transmission between the first UE and the second UE. Based on the response message, a direct link SL connection is established between the first UE and the third UE. The response message is a response message to the connection message sent by the first UE. The third UE and the second UE perform SL data transmission.

2. The method according to claim 1, wherein, The SL connection between the third UE and the second UE is established after the third UE receives the connection message; or, the SL connection between the third UE and the second UE is established before the third UE receives the connection message.

3. The method according to claim 1 or 2, wherein, The connection message is sent by the first UE via broadcast.

4. The method according to claim 3, wherein, The response message carries the SL2 identifier of the third UE and the SL2 identifier of the currently relayed second UE.

5. The method according to claim 1 or 2, wherein, The connection message includes: The SL layer 2 identifier of the first UE; The SL layer 2 identifier of the second UE; The QoS information of the SL data.

6. The method according to claim 5, wherein, The QoS information includes a QoS identifier; or, the QoS information includes a QoS identifier and parameters corresponding to the QoS identifier.

7. The method according to claim 1 or 2, wherein, The connection message is a Radio Resource Control (RRC) Reconstruction Message.

8. A method for handling radio link failure, executed by a third user equipment (UE), the method comprising: Receive a connection message sent by a first UE, wherein the connection message is sent by the first UE when it determines that the direct link SL unicast connection radio link between the first UE and the second UE has failed, and the connection message includes the quality of service (QoS) information of the SL unicast connection radio link between the first UE and the second UE. Based at least on the QoS information, it is determined that the SL unicast radio link between the second UE and the third UE supports relay service transmission between the first UE and the second UE; Send a response message to the first UE, wherein the response message is an acknowledgment message of the connection message sent by the first UE; Establish an SL connection with the first UE; The SL connection is used to transmit SL data between the first UE and the second UE.

9. The method according to claim 8, wherein, The SL connection between the third UE and the second UE is established after the third UE receives the connection message; or, the SL connection between the third UE and the second UE is established before the third UE receives the connection message.

10. The method according to claim 9, wherein, The sending of the response message includes: Based on the connection message, it is determined whether the SL unicast connection radio link between the second UE and the third UE can meet the transmission requirements of the SL data. When it is determined that the transmission requirements of the SL data can be met, the response message is sent to the first UE.

11. The method according to any one of claims 8 to 10, wherein, The response message carries the SL2 identifier of the third UE and the SL2 identifier of the currently relayed second UE.

12. The method according to any one of claims 8 to 10, wherein, The connection message is sent by the first UE via broadcast.

13. The method according to any one of claims 8 to 10, wherein, The connection message includes: The SL layer 2 identifier of the first UE; The SL layer 2 identifier of the second UE; The QoS information of the SL data.

14. The method according to claim 13, wherein, The QoS information includes a QoS identifier; or, the QoS information includes a QoS identifier and parameters corresponding to the QoS identifier.

15. The method according to any one of claims 8 to 10, wherein, The connection message is a Radio Resource Control (RRC) Reconstruction Message.

16. A wireless link failure processing apparatus, applied to a first user equipment (UE), the apparatus comprising a determining unit and a first processing unit; The determining unit is configured to: determine that the direct link SL unicast connection radio link between the second UE and the second UE has failed; The first processing unit is configured to: send a connection message to the third UE, wherein, The connection message includes the Quality of Service (QoS) information of the SL unicast connection radio link between the first UE and the second UE. The system receives a response message sent by the third UE, which is sent when the third UE determines, at least based on the QoS information, that the SL unicast radio link between the second UE and the third UE supports relay service transmission between the first UE and the second UE; establishes a direct link SL connection with the third UE based on the response message, which is a response message to the connection message sent by the first UE; and performs SL data transmission with the second UE through the third UE.

17. A wireless link failure processing apparatus, applied to a third user equipment (UE), the apparatus comprising a second processing unit and a communication unit; The second processing unit is configured to: establish a direct link SL connection with the first UE after sending a response message; The communication unit is configured to: receive a connection message sent by the first UE, wherein... The connection message is sent by the first UE when it determines that the SL unicast connection radio link between the first UE and the second UE has failed. The connection message includes the Quality of Service (QoS) information of the SL unicast connection radio link between the first UE and the second UE. Based at least on the QoS information, it is determined that the SL unicast radio link between the second UE and the third UE supports relay service transmission between the first UE and the second UE; the response message is sent to the first UE, the response message being an acknowledgment message of the connection message sent by the first UE; after establishing an SL connection with the first UE, SL data between the first UE and the second UE is transmitted through the SL connection.

18. A wireless link failure processing apparatus, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to implement the wireless link failure handling method according to any one of claims 1 to 7 when executing the executable instructions.

19. A wireless link failure processing apparatus, comprising: processor; Memory used to store processor-executable instructions; The processor is configured to implement the wireless link failure handling method according to any one of claims 8 to 15 when executing the executable instructions.

20. A computer storage medium storing executable instructions, which, when executed by a processor, cause the processor to perform the wireless link failure handling method according to any one of claims 1 to 7.

21. A computer storage medium storing executable instructions, wherein when executed by a processor, the executable instructions cause the processor to perform the wireless link failure handling method according to any one of claims 8 to 15.

Images