Method for Triggering a Relay Terminal Device to Enter a Connected State and Related Devices

Abstract

The present disclosure provides a method for triggering a relay terminal device to enter a connected state and related devices, relating to the field of wireless communication technologies. The method includes: receiving a radio resource control (RRC) reconfiguration message sent by a network-side device; sending a first signaling message to the relay terminal device, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration. The present disclosure, while ensuring flexible network configuration, timely triggers the relay terminal device to enter the connected state, thereby implementing a multi-path communication function, reducing end-to-end latency, avoiding service interruption or rate reduction problems in scenarios where the non-direct connection path changes, improving network throughput and reliability, and enhancing the user experience.

Description

Background Art

[0002] In Release 16 of 3GPP, NR sidelink technology was introduced, mainly to implement road safety services related to V2X. On this basis, in order to further expand the coverage of the network and sidelink, and improve power efficiency, 3GPP carried out research on NR sidelink Relay technology in Release 17, introducing UE-to-Network Relay (U2N Relay) technology, enabling the remote terminal device to communicate with the base station through the relay terminal device. When the link quality between the remote terminal device and the base station deteriorates, the remote terminal device can select a suitable relay terminal device to ensure service continuity through UE-to-Network relay technology.

[0003] In the related art, when the remote terminal device performs U2N relay communication through the relay terminal device, if the relay terminal device is in the idle or inactive state, it will first initiate the establishment or restoration of a Radio Resource Control (RRC) connection and enter the connected state. However, for the path management scenario in the multi-path relay scenario, which involves the addition or change of the relay terminal device, when the newly added or changed relay terminal device is in the idle or inactive state at this time, how to trigger the relay terminal device to enter the connected state becomes a technical problem to be solved urgently.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] The present disclosure provides a method and related device for triggering a relay terminal device to enter the connected state, which at least to a certain extent overcomes the problem of how to trigger the relay terminal device to enter the connected state in the existing multi-path relay scenario.

[0006] Other features and advantages of the present disclosure will become apparent through the following detailed description, or be learned in part through the practice of the present disclosure.

[0007] According to one aspect of the present disclosure, there is provided a method for triggering a relay terminal device to enter the connected state, which is applied to a remote terminal device. The method includes: receiving an RRC reconfiguration message sent by a network-side device; and sending a first signaling message to the relay terminal device, where the first signaling message is used to trigger the relay terminal device in the RRC idle state to perform RRC connection establishment or trigger the relay terminal device in the RRC inactive state to perform RRC connection restoration.

[0008] In an embodiment of the present disclosure, the first signaling message includes at least one of a direct link interface PC5-RRC message or an RRC reconfiguration complete message; wherein, when the first signaling message includes a PC5-RRC message, the PC5-RRC message includes at least a first cell, and the first cell is used to trigger the relay terminal device to enter the RRC connected state; when the first signaling message includes an RRC reconfiguration complete message, the RRC reconfiguration complete message is sent by the remote terminal device through a default-configured direct link-radio link control SL-RLC1.

[0009] In an embodiment of the present disclosure, when the first signaling message includes an RRC reconfiguration complete message, sending the first signaling message to the relay terminal device includes: when the RRC reconfiguration message contains configuration information related to the signaling radio bearer SRB1 on the non-direct path, sending the RRC reconfiguration complete message to the relay terminal device through the default-configured SL-RLC1, so that the relay terminal device in the RRC idle state performs related operations for RRC connection establishment or the relay terminal device in the RRC inactive state performs related operations for RRC connection recovery.

[0010] In an embodiment of the present disclosure, the configuration information related to SRB1 on the non-direct path includes at least one of the following: an independent SRB1 is configured on the non-direct path, an SRB1 supporting separation is configured and the main RLC entity of the separated SRB1 is configured on the non-direct path, and an SRB1 supporting redundant transmission is configured.

[0011] In an embodiment of the present disclosure, when the first signaling message includes a PC5-RRC message, sending the first signaling message to the relay terminal device includes at least one of the following: when the RRC reconfiguration message contains a second cell, sending the PC5-RRC message to the relay terminal device; or when the SRB1 is not configured on the non-direct path in the RRC reconfiguration message, or an SRB1 supporting separation is configured and the main RLC entity of the separated SRB1 is not configured on the non-direct path, the remote terminal device sends the PC5-RRC message to the relay terminal device; or when it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, sending the PC5-RRC message to the relay terminal device.

[0012] In an embodiment of the present disclosure, when the RRC reconfiguration message contains a second cell, the second cell is used to indicate that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

[0013] In an embodiment of the present disclosure, when it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, sending a first signaling message to the relay terminal device includes at least one of the following: during the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the remote terminal device obtains the RRC status information of the relay terminal device, and the obtained RRC status information of the relay terminal device is in the RRC idle state or the RRC inactive state, sending the PC5-RRC message to the relay terminal device; or during the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the relay terminal device indicates that the remote terminal device needs to send a PC5-RRC message, sending the PC5-RRC message to the relay terminal device.

[0014] In an embodiment of the present disclosure, the method further includes: sending an RRC reconfiguration complete message to the network-side device through a direct path and / or an indirect path.

[0015] In an embodiment of the present disclosure, sending an RRC reconfiguration complete message to the network-side device through a direct path and / or an indirect path includes at least one of the following: when a split SRB1 supporting redundant transmission is configured in the RRC reconfiguration message, sending the RRC reconfiguration complete message to the network-side device through a direct path and an indirect path; when a split SRB1 is configured in the RRC reconfiguration message and the primary RLC entity of the split SRB1 is configured on the direct path, or an independent SRB1 is configured on the direct path, sending the RRC reconfiguration complete message to the network-side device through the direct path; when the remote terminal device needs to send a PC5-RRC message to the relay terminal device and an available SRB1 is configured on the direct path, sending the RRC reconfiguration complete message to the network-side device through the SRB1 on the direct path.

[0016] In an embodiment of the present disclosure, when the remote terminal device needs to send a PC5-RRC message to the relay terminal device and an available SRB1 is configured on the direct path, the available SRB1 configured on the direct path includes at least one of the following: an independent SRB1 is configured on the direct path, or a split SRB1 is configured and the primary RLC entity of the split SRB1 is configured on the direct path.

[0017] In an embodiment of the present disclosure, the RRC reconfiguration message includes at least one of the following information: local ID information of the remote terminal device; source layer 2 ID information of the relay terminal device; direct link relay adaptation protocol (SRAP) configuration information; SRB1-related configuration information, where the SRB1-related configuration information includes at least one of the following: configuring an independent SRB1 on the direct path and / or non-direct path, configuring an SRB1 supporting separation, configuring an SRB1 supporting redundant transmission; a second cell for indicating that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

[0018] According to another aspect of the present disclosure, there is provided a method for triggering a relay terminal device to enter a connected state, which is applied to a network-side device. The method includes: sending an RRC reconfiguration message to a remote terminal device, so that the remote terminal device sends a first signaling message to the relay terminal device according to the RRC reconfiguration message, and the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration.

[0019] According to another aspect of the present disclosure, there is provided a method for triggering a relay terminal device to enter a connected state, which is applied to a relay terminal device. The method includes: receiving a first signaling message sent by a remote terminal device; when the relay terminal device is in the RRC idle state, performing an operation of establishing an RRC connection; when the relay terminal device is in the RRC inactive state, performing an operation of restoring an RRC connection.

[0020] According to another aspect of the present disclosure, there is provided a remote terminal device, including: a configuration message receiving module, configured to receive an RRC reconfiguration message sent by a network-side device; a signaling message sending module, configured to send a first signaling message to a relay terminal device, and the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration.

[0021] According to another aspect of the present disclosure, there is provided a network-side device, including: a configuration message sending module, configured to send an RRC reconfiguration message to a remote terminal device, so that the remote terminal device sends a first signaling message to the relay terminal device according to the RRC reconfiguration message, and the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration.

[0022] According to another aspect of the present disclosure, there is provided a relay terminal device, including: a signaling message receiving module, configured to receive a first signaling message sent by a remote terminal device; an RRC connection module, configured to perform an operation of establishing an RRC connection when the relay terminal device is in the RRC idle state; and perform an operation of resuming an RRC connection when the relay terminal device is in the RRC inactive state.

[0023] According to another aspect of the present disclosure, there is provided a communication system, including a network-side device, a relay terminal device, and a remote terminal device, wherein the network-side device is configured to send an RRC reconfiguration message to the remote terminal device; the remote terminal device is configured to receive the radio resource control (RRC) reconfiguration message sent by the network-side device; and send a first signaling message to the relay terminal device, where the first signaling message is used to trigger the relay terminal device in the RRC idle state to perform RRC connection establishment or trigger the relay terminal device in the RRC inactive state to perform RRC connection resume; the relay terminal device is configured to receive the first signaling message sent by the remote terminal device; perform an operation of establishing an RRC connection when the relay terminal device is in the RRC idle state; and perform an operation of resuming an RRC connection when the relay terminal device is in the RRC inactive state.

[0024] According to another aspect of the present disclosure, there is provided an electronic device, including: a processor; and a memory, configured to store executable instructions of the processor; wherein the processor is configured to execute the method for triggering a relay terminal device to enter a connected state as described above by executing the executable instructions.

[0025] According to another aspect of the present disclosure, there is provided a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for triggering a relay terminal device to enter a connected state as described above is implemented.

[0026] According to another aspect of the present disclosure, there is provided a computer program product, including executable instructions, where the executable instructions are stored in a computer-readable storage medium, and a processor of an electronic device reads the executable instructions from the computer-readable storage medium, and the processor executes the executable instructions, so that the electronic device executes the method for triggering a relay terminal device to enter a connected state as described above.

[0027] In an embodiment of the present disclosure, an RRC reconfiguration message sent by a network-side device is received; a first signaling message is sent to a relay terminal device, and the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection recovery. While ensuring flexible network configuration, the relay terminal device is timely triggered to enter the connected state, thereby implementing the multipath communication function, reducing the end-to-end delay, avoiding service interruption or rate reduction in the case of non-direct path change scenarios, improving network throughput and reliability, and enhancing the user experience.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0030] Figure 1 A schematic diagram showing an exemplary system architecture of a method for triggering a relay terminal device to enter the connected state in an embodiment of the present disclosure.

[0031] Figure 2 A flowchart showing a method for triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0032] Figure 3 A flowchart showing another method for triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0033] Figure 4 A flowchart showing yet another method for triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0034] Figure 5 A flowchart showing still another method for triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0035] Figure 6 A flowchart showing a method for triggering a relay terminal device to enter the connected state applied to a network-side device provided in an embodiment of the present disclosure.

[0036] Figure 7 A flowchart showing a method for triggering a relay terminal device to enter the connected state applied to a relay terminal device provided in an embodiment of the present disclosure.

[0037] Figure 8 An interaction diagram showing the first example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0038] Figure 9 An interaction diagram showing the second example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0039] Figure 10 An interaction diagram showing the third example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0040] Figure 11 An interaction diagram showing the fourth example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0041] Figure 12 An interaction diagram showing the fifth example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0042] Figure 13 An interaction diagram showing the sixth example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0043] Figure 14 An interaction diagram showing the seventh example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0044] Figure 15 An interaction diagram showing the eighth example of triggering a relay terminal device to enter the connected state provided in an embodiment of the present disclosure.

[0045] Figure 16 A schematic structural diagram of a remote terminal device provided in an embodiment of the present disclosure.

[0046] Figure 17 A schematic structural diagram of a network-side device provided in an embodiment of the present disclosure.

[0047] Figure 18 A schematic structural diagram of a relay terminal device provided in an embodiment of the present disclosure.

[0048] Figure 19 A structural block diagram of an electronic device provided in an embodiment of the present disclosure. Detailed implementation manners

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0050] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0051] Figure 1 A schematic diagram of an exemplary system architecture to which a method for triggering a relay terminal device to enter a connected state or a device for triggering a relay terminal device to enter a connected state according to an embodiment of the present disclosure can be applied is shown.

[0052] As Figure 1 shown, the system architecture 100 may include a remote terminal device 101, a relay terminal device 102, and a network-side device 103.

[0053] The network can be a medium that provides communication links between the remote terminal device 101 and the relay terminal device 102, and between the remote terminal device 101 and the network-side device 103. It can be a wired network or a wireless network.

[0054] The user can use the remote terminal device 101 to interact with the network-side device 103 through the network to receive or send messages. The user can also use the remote terminal device 101 to interact with the network-side device 103 through the relay terminal device 102 to receive or send messages.

[0055] Optionally, the above-mentioned wireless network uses standard communication technologies and / or protocols. The wireless network is typically the Internet, but can also be any network, including but not limited to any combination of a local area network (LAN), a metropolitan area network (MAN), a wide area network (WAN), a mobile, wired or wireless network, a private network or a virtual private network. In some embodiments, technologies and / or formats including Hyper Text Mark-up Language (HTML), Extensible Markup Language (XML), etc. are used to represent data exchanged through the network. Additionally, conventional encryption technologies such as Secure Socket Layer (SSL), Transport Layer Security (TLS), Virtual Private Network (VPN), Internet Protocol Security (IPsec), etc. can be used to encrypt all or some of the links. In other embodiments, custom and / or proprietary data communication technologies can be used to replace or supplement the above data communication technologies.

[0056] It can be understood that a wireless communication system is a network that provides wireless communication functions. The communication system can adopt different communication technologies, such as Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency-division Multiple Access (OFDMA), Single Carrier FDMA (SC-FDMA), Carrier Sense Multiple Access with Collision Avoidance. According to factors such as the capacity, rate, and latency of different networks, the network can be divided into 2G (generation) network, 3G network, 4G network, 5G network, or future evolved networks, such as 5G-A network, 6G network, which are simply referred to as network or system. In the present disclosure, the network-side device 103 can be a base station. The radio access network can provide network services for the terminal device through the base station. Different operators can provide different network services for the terminal device, or it can be understood that different operators correspond to different operator networks.

[0057] The remote terminal device (User Equipment, UE) 101 and the relay terminal device 102 can be various electronic devices, also known as user equipment, terminals, etc., including but not limited to smartphones, tablets, laptop computers, desktop computers, wearable devices, augmented reality devices, virtual reality devices, etc.

[0058] Optionally, the clients of the application programs installed in different remote terminal devices 101 and relay terminal devices 102 are the same, or the clients of the same type of application programs based on different operating systems. Based on the differences in the terminal platforms, the specific forms of the clients of the application programs can also be different. For example, the client of the application program can be a mobile client, a PC client, etc.

[0059] Those skilled in the art can know that Figure 1 the numbers of the remote terminal device 101, the relay terminal device 102, and the network-side device 103 in are only illustrative. According to actual needs, there can be any number of remote terminal devices, relay terminal devices, and network-side devices. The embodiments of the present disclosure do not limit this.

[0060] The remote terminal device 101 can communicate directly with the base station through the Uu interface, which is called the direct path; the remote terminal device 101 can communicate with the network-side device 103 through the PC5 interface between the remote terminal device 101 and the relay terminal device 102 and the Uu interface between the relay terminal device 102 and the network-side device 103, which is called the non-direct path.

[0061] In R17, the terminal device can communicate with the network side through the direct path or the non-direct path, but does not support the terminal device to communicate through the direct path and the non-direct path at the same time, that is, it does not support the multi-path relay communication technology (multi-path Relay).

[0062] In order to further improve the network throughput and reliability, 3GPP introduced the Multi-Path Relay technology in the R18 Sidelink Relay enhancement project and supports the following path management scenarios.

[0063] Scenario A: The remote terminal device first works on the direct path and then adds the non-direct path;

[0064] Scenario B: The remote terminal device first works on the non-direct path and then adds the direct path;

[0065] Scenario C: The remote terminal device first works in the multi-path mode and then deletes the non-direct path;

[0066] Scenario D: The remote terminal device first works in the multi-path mode and then deletes the direct path;

[0067] Scenario E: The remote terminal device works in the multi-path mode, keeps the direct path unchanged, and changes the non-direct path (re-selects a new relay terminal device);

[0068] Scenario F: The remote terminal device works in the multi-path mode, keeps the non-direct path unchanged, and changes to the direct path to a different cell.

[0069] In the related technology, when the remote terminal device performs U2N relay communication through the relay terminal device, if the relay terminal device is in the RRC idle state or the RRC inactive state, it will first initiate an RRC connection establishment or connection recovery and enter the RRC connected state. The method to trigger the relay terminal device to enter the connected state is when the relay terminal device receives an RRC message sent by the remote terminal device through a specific default configuration (SL-RLC0 or SL-RLC1) (the message carried by SRB0 or SRB1), triggering the RRC connection establishment process or connection recovery process and entering the connected state.

[0070] For the R17 U2N relay scenario, the remote terminal device has only a direct path or a non-direct path at the same time. When switching from the direct path to the non-direct path, the RRC reconfiguration complete message (the message carried by SRB1) can only be forwarded by the relay terminal device. Therefore, when the relay terminal device is in the RRC idle state or the RRC inactive state, receiving the RRC reconfiguration complete message sent by the remote terminal device can trigger the RRC connection establishment process or the connection restoration process of the relay terminal device.

[0071] For path management scenarios A and E in the multi-path relay scenario, which involve the addition or change of the relay terminal device. When the newly added or changed relay terminal device is in the RRC idle state or the RRC inactive state at this time, it is also necessary to solve the problem of how to trigger the relay terminal device to enter the connected state.

[0072] Different from the R17 U2N relay scenario, in the multi-path relay scenario, the remote terminal device will maintain the direct path, and the RRC reconfiguration complete message used to indicate the completion of the addition or change of the relay terminal device can be directly sent through the direct path. Therefore, the method of R17 cannot be directly used to trigger the relay terminal device to enter the connected state, and thus the function of multi-path communication cannot be realized.

[0073] If it is restricted that the remote terminal device must still send the RRC message carried by SRB1 through the non-direct path when the direct path is available, it will severely limit the configuration of the network-side device, which is not conducive to the flexible deployment of the network-side device, affects the network performance. If the relay terminal device in the RRC idle state or the RRC inactive state cannot enter the connected state in time, when the remote terminal device needs to send data through multiple paths, it will cause serious delay, affecting the user experience and the performance of multi-path communication.

[0074] To solve the above technical problems, the solution provided by the embodiments of the present disclosure is to receive the RRC reconfiguration message sent by the network-side device; send a first signaling message to the relay terminal device, and the first signaling message is used to trigger the relay terminal device in the RRC idle state to perform RRC connection establishment or trigger the relay terminal device in the RRC inactive state to perform RRC connection restoration. While ensuring the flexible configuration of the network, it can timely trigger the relay terminal device to enter the connected state, thereby realizing the multi-path communication function, reducing the end-to-end delay, avoiding the problems of service interruption or rate reduction in the non-direct path change scenario, improving the network throughput and reliability, and enhancing the user experience. The specific description is as follows through the following embodiments:

[0075] First, in the embodiments of the present disclosure, a method for triggering a relay terminal device to enter the connected state is provided, and this method can be executed by any system with computing and processing capabilities. In a feasible implementation, the process corresponding to this method can be executed by a remote terminal device; in another feasible implementation, the process corresponding to this method can be executed by a network-side device; in other feasible implementations, the process corresponding to this method can be executed by a relay terminal device.

[0076] Figure 2 The flowchart of a method for triggering a relay terminal device to enter the connected state in the embodiments of the present disclosure is shown. As Figure 2 shown, the method for triggering a relay terminal device to enter the connected state provided in the embodiments of the present disclosure, when applied to a remote terminal device, includes the following steps:

[0077] S202. Receive the RRC reconfiguration message sent by the network-side device.

[0078] It should be noted that the RRC reconfiguration message in S202 may include at least one of the following information: local ID information of the remote terminal device; source layer 2 ID information of the relay terminal device; direct link relay adaptation protocol SRAP configuration information; SRB1-related configuration information; a second cell.

[0079] Among them, the remote terminal device can determine the relay terminal device on the non-direct connection path according to the source layer 2 ID information of the relay terminal device indicated by the network-side device. It should be noted that in the scenario of changing the non-direct connection path, the above-mentioned relay terminal device can be the target relay terminal device.

[0080] The above-mentioned SRB1-related configuration information includes at least one of the following: configuring an independent SRB1 on the direct connection path and / or the non-direct connection path, configuring an SRB1 that supports separation, and configuring an SRB1 that supports redundant transmission.

[0081] The above-mentioned second cell is used to indicate that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

[0082] S204. Send a first signaling message to the relay terminal device, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection recovery.

[0083] In one embodiment, the first signaling message may include at least one of a direct link interface PC5-RRC message or an RRC reconfiguration complete message.

[0084] Exemplarily, when the first signaling message includes a PC5-RRC message, the PC5-RRC message includes at least a first cell, and the first cell is used to trigger the relay terminal device to enter the RRC connected state. It should be noted that the PC5-RRC message can be a newly defined message or reuse the existing PC5-RRC message.

[0085] Exemplarily, when the first signaling message includes an RRC reconfiguration complete message, the RRC reconfiguration complete message is sent by the remote terminal device through the default-configured direct link - radio link control SL-RLC1.

[0086] After the remote terminal device sends the first signaling message to the relay terminal device, the relay terminal device receives the PC5-RRC message sent by the remote terminal device for triggering the relay terminal device to enter the connected state, or the relay terminal device receives the RRC reconfiguration complete message sent by the remote terminal device through a specific SL-RLC1 configuration. If the relay terminal device is in the RRC idle state or the RRC inactive state at this time, it performs the RRC connection establishment or RRC connection recovery process and enters the RRC connected state. That is, the relay terminal device in the RRC idle state performs the RRC connection establishment, and the relay terminal device in the RRC inactive state performs the RRC connection recovery.

[0087] It should be noted that for the scenario where the relay terminal device receives the RRC reconfiguration complete message sent by the remote terminal device through the SL-RLC configuration, after the relay terminal device enters the connected state, it forwards the RRC reconfiguration complete message sent by the remote terminal device to the network side device.

[0088] The network side device sends an RRC reconfiguration message to the relay terminal device to instruct the relay terminal device to add the remote terminal device, so as to enable multi-path uplink and downlink transmission between the remote terminal device and the network side device.

[0089] The solution provided by the embodiments of the present disclosure receives the RRC reconfiguration message sent by the network side device; sends the first signaling message to the relay terminal device, and the first signaling message is used to trigger the relay terminal device in the RRC idle state to perform RRC connection establishment or trigger the relay terminal device in the RRC inactive state to perform RRC connection recovery. While ensuring flexible network configuration, it timely triggers the relay terminal device to enter the connected state, thereby realizing the multi-path communication function, reducing the end-to-end delay, avoiding the problems of service interruption or rate reduction in the case of non-direct path change scenarios, improving the network throughput and reliability, and enhancing the user experience.

[0090] Figure 3The flowchart of another method for triggering a relay terminal device to enter the connected state provided in the embodiments of the present disclosure is shown. Based on the embodiment in FIG. 2, S204 is further refined into S2042 to define the case where the first signaling message includes an RRC reconfiguration complete message. As Figure 3 shown, in one embodiment, when the first signaling message includes an RRC reconfiguration complete message, sending the first signaling message to the relay terminal device in S204 above includes:

[0091] S2042. When the RRC reconfiguration message contains configuration information related to SRB1 on the non-direct path, send the RRC reconfiguration complete message to the relay terminal device through the default-configured SL-RLC1, so that the relay terminal device in the RRC idle state performs relevant operations for RRC connection establishment or the relay terminal device in the RRC inactive state performs relevant operations for RRC connection recovery.

[0092] It should be noted that the above configuration information related to SRB1 on the non-direct path includes at least one of the following: an independent SRB1 is configured on the non-direct path, an SRB1 supporting separation is configured and the main RLC entity of the separated SRB1 is configured on the non-direct path, and an SRB1 supporting redundant transmission is configured.

[0093] When an independent SRB1 is configured on the non-direct path, or an SRB1 supporting separation and the main RCL entity of the separated SRB1 is configured on the non-direct path, or an SRB1 supporting redundant transmission, it indicates that the RRC reconfiguration complete message can be sent to the network-side device on the non-direct path through the default-configured SL-RLC1, thereby triggering the relay terminal device to enter the connected state through the RRC reconfiguration complete message.

[0094] In the embodiment of the present disclosure, when the RRC reconfiguration message contains configuration information related to SRB1 on the non-direct path, the RRC reconfiguration complete message is sent to the relay terminal device through the default-configured SL-RLC1, thereby triggering the relay terminal device to enter the connected state through the RRC reconfiguration complete message, realizing multi-path communication, reducing the end-to-end delay, and improving the system performance and user experience.

[0095] Figure 4 The flowchart of yet another method for triggering a relay terminal device to enter the connected state provided in the embodiments of the present disclosure is shown. In Figure 2 the embodiment, S204 is further refined into S2044 to define the case where the first signaling message includes a PC5-RRC message. As Figure 4 shown, in one embodiment, when the first signaling message includes a PC5-RRC message, sending the first signaling message to the relay terminal device in S204 above includes at least one of the following:

[0096] S2044. When the RRC reconfiguration message contains a second cell, send a PC5-RRC message to the relay terminal device; or

[0097] When the SRB1 is not configured on the sidelink path in the RRC reconfiguration message, or when a separate SRB1 is configured and the primary RLC entity configuration of the separate SRB1 is not configured on the sidelink path, the remote terminal device sends a PC5-RRC message to the relay terminal device; or

[0098] When it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, send a PC5-RRC message to the relay terminal device.

[0099] It should be noted that when the RRC reconfiguration message contains a second cell, the second cell is used to indicate that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

[0100] In one embodiment, when it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, sending the first signaling message to the relay terminal device in S204 includes: during the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the remote terminal device obtains the RRC status information of the relay terminal device, and when the obtained RRC status information of the relay terminal device is in the RRC idle state or the RRC inactive state, send a PC5-RRC message to the relay terminal device; or during the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the relay terminal device indicates that the remote terminal device needs to send a PC5-RRC message, send a PC5-RRC message to the relay terminal device.

[0101] During the interaction between the remote terminal device and the relay terminal device, for example, the interaction information during the sidelink discovery or the PC5 connection establishment process, add relevant indication information, such as the RRC status indication information of the relay terminal device, or the information indicating that the relay terminal device needs to trigger entry into the connected state, etc.

[0102] Exemplarily, during the interaction process, the remote terminal device obtains the connection status information of the relay terminal device or the indication of whether a PC5-RRC message needs to be sent to trigger the relay terminal device to enter the connected state, etc. When the RRC status information indicated by the relay terminal device is in the RRC idle state or the RRC inactive state, or when the relay terminal device indicates that the remote terminal device needs to send a PC5-RRC message, the remote terminal device sends a PC5-RRC message, thereby triggering the relay terminal device to perform relevant operations to enter the connected state.

[0103] In the embodiments of the present disclosure, by carrying a second cell in the RRC reconfiguration message, or when the SRB1 is not configured on the sidelink path in the RRC reconfiguration message, or when the configured split SRB1 and the main RLC entity configuration of the split SRB1 are not configured on the sidelink path, and / or by determining that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, it is determined in multiple different ways that a PC5-RRC message needs to be sent to the relay terminal device, thereby triggering the relay terminal device to enter the connected state, implementing multi-path communication, reducing the end-to-end delay, and improving the system performance and user experience.

[0104] Figure 5 Fig. shows a flowchart of another method for triggering a relay terminal device to enter the connected state provided in the embodiments of the present disclosure. Figure 2 On the basis of the embodiment, S502 is added after S204 to limit the sending manner of the RRC reconfiguration completion message. As Figure 5 shown, in one embodiment, the method for triggering a relay terminal device to enter the connected state provided in the embodiments of the present disclosure includes S202 to S204, and S502. Among them, the method includes:

[0105] S502. Send an RRC reconfiguration completion message to the network-side device through the sidelink path and / or the direct path.

[0106] It should be noted that the implementation manners of S202 to S204 in this embodiment are the same as those of S202 to S204 in the foregoing embodiments, and will not be elaborated here.

[0107] In one embodiment, the above S502 sends an RRC reconfiguration completion message to the network-side device through the sidelink path and / or the direct path, including at least one of the following:

[0108] When the split SRB1 supporting redundant transmission is configured in the RRC reconfiguration message, send an RRC reconfiguration completion message to the network-side device through the sidelink path and the direct path;

[0109] When the split SRB1 is configured in the RRC reconfiguration message and the main RLC entity configuration of the split SRB1 is configured on the direct path, or an independent SRB1 is configured on the direct path, send an RRC reconfiguration completion message to the network-side device through the direct path;

[0110] When the remote terminal device needs to send a PC5-RRC message to the relay terminal device and an available SRB1 is configured on the direct path, send an RRC reconfiguration completion message to the network-side device through the SRB1 on the direct path.

[0111] In one embodiment, when the remote terminal device needs to send a PC5-RRC message to the relay terminal device and the direct connection path is configured with an available SRB1, the direct connection path configured with an available SRB1 includes at least one of the following: the direct connection path is configured with an independent SRB1, or is configured with a supporting split SRB1 and the primary RLC entity of the split SRB1 is configured on the direct connection path.

[0112] In the embodiment of the present disclosure, by reasonably configuring the SRB1 of the direct connection path and the non-direct connection path in the RRC reconfiguration message, the RRC reconfiguration completion message is sent to the network side device through the direct connection path and / or the non-direct connection path, thereby realizing multi-path communication, reducing the end-to-end delay, and improving the system performance and user experience.

[0113] Figure 6 The flowchart of the method for triggering a relay terminal device to enter the connected state applied to the network side device provided in the embodiment of the present disclosure is shown. As Figure 6 shown, the method for triggering a relay terminal device to enter the connected state provided in the embodiment of the present disclosure, applied to the network side device, includes:

[0114] S602. Send an RRC reconfiguration message to the remote terminal device, so that the remote terminal device sends a first signaling message to the relay terminal device according to the RRC reconfiguration message, and the first signaling message is used to trigger the relay terminal device in the RRC idle state to perform RRC connection establishment or trigger the relay terminal device in the RRC inactive state to perform RRC connection recovery.

[0115] Figure 7 The flowchart of the method for triggering a relay terminal device to enter the connected state applied to the relay terminal device provided in the embodiment of the present disclosure is shown. As Figure 7 shown, the method for triggering a relay terminal device to enter the connected state provided in the embodiment of the present disclosure, applied to the relay terminal device, includes:

[0116] S702. Receive the first signaling message sent by the remote terminal device;

[0117] S704. When the relay terminal device is in the RRC idle state, perform the operation of RRC connection establishment; when the relay terminal device is in the RRC inactive state, perform the operation of RRC connection recovery.

[0118] It should be noted that the implementation manners of the network side device and the relay terminal device can refer to the embodiments in the remote terminal device, and will not be elaborated here.

[0119] To deepen the understanding of the method for triggering a relay terminal device to enter the connected state provided in the present disclosure, the following is combined with the attached Figures 8 - 15 for illustration.

[0120] The communication system includes a remote terminal device, a relay terminal device, and a network-side device. Herein, the network-side device is described by taking a base station as an example.

[0121] The remote terminal device first operates on the direct path and then adds a non-direct path, that is, scenario A. The processes of Embodiment 1 to Embodiment 4 can be used to trigger the relay terminal device to enter the connected state.

[0122] In the multi-path relay scenario, the remote terminal device first operates on the direct path, that is, directly communicates with the base station through the Uu interface; then, under the indication of the base station, a non-direct path is added to increase the path through the relay terminal device to the base station. When the relay terminal device selected by the base station is in the RRC idle state or the RRC inactive state, it is necessary to first trigger the relay terminal device to enter the connected state to enable uplink and downlink multi-path transmission.

[0123] Embodiment 1:

[0124] In this scenario, the base station only configures SRB1 on the direct path and instructs the remote terminal device not to send a PC5-RRC message to trigger the target relay terminal device to enter the connected state (that is, the relay terminal device is already in the connected state). As Figure 8 shown, the process of triggering the relay terminal device to enter the connected state is as follows:

[0125] S801. The remote terminal device performs uplink and downlink transmission with the base station through a single path, that is, the remote terminal device transmits uplink / downlink data with the base station through a single path. The above single path can be a direct path.

[0126] S802. The remote terminal device performs measurement configuration and measurement reporting according to the network configuration.

[0127] S803. According to the measurement results reported by the remote terminal device, the base station determines to add a non-direct path, selects the target relay terminal device, and sends an RRC reconfiguration message to the remote terminal device. The RRC reconfiguration message includes at least one or more of the following information: the local ID of the remote terminal, the source layer 2 L2ID information of the target relay terminal device, SRAP configuration information, SRB1-related configuration information, etc. The SRB1-related configuration information is that only SRB1 is configured on the direct path.

[0128] S804. The remote terminal device establishes a PC5 connection with the relay terminal device; according to the content of the RRC reconfiguration message, at this time, it is not necessary to send a PC5-RRC message to the target relay terminal device.

[0129] S805. The base station sends an RRC reconfiguration message to the target relay terminal device, instructing the target relay terminal device to add a remote terminal device. Among them, the RRC reconfiguration message received by the target relay terminal device at least includes the following content: the local ID and L2 ID information of the remote terminal device, SRAP-related configurations, etc.

[0130] S806. The remote terminal device determines to send an RRC reconfiguration complete message through a direct path or a non-direct path according to the content of the RRC reconfiguration message. If the base station does not configure SRB1 on the non-direct path, it is sent through the direct path.

[0131] S807. The remote terminal device and the base station perform uplink and downlink multipath transmission.

[0132] It should be noted that there is no sequential association between S804 and S805 above. For example, S804 can be executed before S805 or after S805, depending on the implementation of the terminal device and the network side device.

[0133] Embodiment 2:

[0134] The base station can configure SRB1 on the non-direct path (such as configuring split SRB1, SRB1 redundant transmission, or only configuring SRB1 on the non-direct path, etc.). The remote terminal device sends an SRB1 message (i.e., an RRC reconfiguration complete message) on the non-direct path to trigger the target relay terminal device to enter the connected state, without sending a PC5-RRC message. As Figure 9 shown, the process of triggering the relay terminal device to enter the connected state is as follows:

[0135] S901. The remote terminal device performs uplink and downlink transmission with the base station through a single path, that is, the remote terminal device and the base station transmit uplink / downlink data through a single path. The above single path can be a direct path. This step is the same as S801 in Embodiment 1.

[0136] S902. The remote terminal device performs measurement configuration and measurement reporting according to the network configuration. This step is the same as S802 in Embodiment 1.

[0137] S903. The base station determines to add a non-direct path according to the measurement results reported by the remote terminal device, and selects a target relay terminal device; the base station sends an RRC reconfiguration message to the remote terminal device. Among them, the RRC reconfiguration information at least includes one or more of the following information: the local ID information of the remote terminal device, the L2 ID information of the target relay terminal device, SRAP-related configurations, SRB1-related configuration information, etc. Among them, the SRB1-related configuration information is to configure SRB1 on the non-direct path.

[0138] S904. The remote terminal device establishes a PC5 connection with the relay terminal device. At this time, the remote terminal device determines according to the RRC reconfiguration message that it does not need to send a PC5-RRC message to the target relay terminal device to trigger the target relay terminal device to enter the connected state; the remote terminal device determines according to the content of the RRC reconfiguration message to send the RRC reconfiguration complete message through the non-direct connection path; the remote terminal device sends the RRC reconfiguration complete message to the relay terminal device through a specific default configuration (SL-RLC1).

[0139] S905. When the relay terminal device receives the RRC message sent by the remote terminal device through a specific default configuration (SL-RLC1), if the relay terminal device is not in the RRC connected state at this time, it performs relevant operations to enter the connected state. If the relay terminal device is in the RRC idle state at this time, it performs the RRC connection establishment process; if the relay terminal device is in the RRC inactive state at this time, it performs the RRC connection restoration process.

[0140] S906. The base station sends an RRC reconfiguration message to the target relay terminal device, instructing the target relay terminal device to add the remote terminal device. The content of the RRC reconfiguration message received by the target relay terminal device at least includes the following: the local ID and L2 ID information of the remote terminal device, SRAP-related configuration, etc.

[0141] S907. The relay terminal device sends the RRC message (i.e., the RRC reconfiguration complete message) sent by the remote terminal device to the base station according to the base station configuration.

[0142] S908. The remote terminal device and the base station perform uplink and downlink multi-path transmission.

[0143] Embodiment Three:

[0144] The base station adds a second cell in the RRC reconfiguration message to instruct the remote terminal device to send a PC5-RRC message to trigger the target relay terminal device to enter the connected state. As Figure 10 shown, the process of triggering the relay terminal device to enter the connected state is as follows:

[0145] S1001 - S1002 are the same as S801 - S802 in Embodiment One and will not be elaborated here.

[0146] S1003. The base station determines to add a non-direct connection path based on the measurement results reported by the remote terminal device, and selects a target relay terminal device. The base station sends an RRC reconfiguration message to the remote terminal device, and the RRC reconfiguration message includes at least one or more of the following information: the local ID information of the remote terminal device, the L2 ID information of the target relay terminal device, SRAP-related configuration, and a second cell, where the second cell is used to indicate that the remote terminal device needs to send a PC5-RRC message to the relay terminal device, thereby triggering the relay terminal device to enter the connected state.

[0147] S1004. The remote terminal device establishes a PC5 connection with the relay terminal device. The remote terminal device determines that it needs to send a PC5-RRC message to the target relay terminal device according to the second cell in the RRC reconfiguration message, which is used to trigger the target relay terminal device to enter the RRC connected state.

[0148] S1005. The remote terminal device sends a PC5-RRC message to the relay terminal device. The PC5-RRC message includes at least a first cell, which is used to trigger the relay terminal device to enter the RRC connected state.

[0149] S1006. The relay terminal device receives the PC5-RRC message sent by the remote terminal device. If the relay terminal device is not in the RRC connected state at this time, it performs relevant operations to enter the RRC connected state according to the first cell. If the relay terminal device is in the RRC idle state at this time, it performs the RRC connection establishment process. If the relay terminal device is in the RRC inactive state at this time, it performs the RRC connection recovery process.

[0150] S1007. The base station sends an RRC reconfiguration message to the target relay terminal device, instructing the target relay terminal device to add the remote terminal device. The message content includes at least the following: the local ID and L2 ID information of the remote terminal device, SRAP-related configuration, etc.

[0151] S1008. The remote terminal device sends an RRC reconfiguration complete message to the base station through a direct connection path (or a non-direct connection path) according to the base station configuration.

[0152] S1009. Multi-path transmission in the uplink and downlink is performed between the remote terminal device and the base station.

[0153] It should be noted that the execution order of S1008 has nothing to do with that of S1004 - S1007, and it only needs to be after S1003, specifically depending on the implementation of the terminal device.

[0154] Embodiment 4:

[0155] Based on the implementation or relevant indication information obtained during the interaction with the relay terminal device, the remote terminal device independently determines to send a PC5-RRC message to trigger the target relay terminal device to enter the connected state. As Figure 11 shown, a method for triggering a relay terminal device to enter the connected state includes the following steps:

[0156] S1101 to S1102 are the same as S801 to S802 in Embodiment 1, and will not be elaborated here.

[0157] S1103: The base station determines to add a non-direct connection path based on the measurement results reported by the remote terminal device, and selects a target relay terminal device; the base station sends an RRC reconfiguration message to the remote terminal device, and the RRC reconfiguration message includes at least one or more of the following information: the local ID information of the remote terminal device, the L2ID information of the target relay terminal device, and the SRAP-related configuration.

[0158] S1104: The remote terminal device establishes a PC5 connection with the relay terminal device and obtains relevant indication information during the interaction, such as the RRC status indication information of the relay terminal device, or the information indicating that the relay terminal device needs to be triggered to enter the connected state, etc.; the remote terminal device determines that it needs to send a PC5-RRC message to the target relay terminal device to trigger the target relay terminal device to enter the RRC connected state according to the relevant indication information.

[0159] S1105 to S1108 are the same as S1005 to S1008 in Embodiment 3.

[0160] S1109: The remote terminal device performs uplink and downlink multi-path transmission with the base station.

[0161] It should be noted that S1108 has no sequential relationship with S1104 to S1107, and it can be after S1003, specifically depending on the implementation of the terminal device.

[0162] For scenario E, the remote terminal device operates in the multi-path mode, keeps the direct connection path unchanged, and changes the non-direct connection path, that is, re-selects a new relay terminal device.

[0163] In scenario E, in the multi-path mode, the remote terminal device operates in the multi-path mode, and then changes the non-direct connection path under the indication of the base station to select a new relay terminal device. When the relay terminal device selected by the base station is in the RRC idle state or the RRC inactive state, it is necessary to first trigger the relay terminal device to enter the RRC connected state before the uplink and downlink multi-path transmission can be realized. In this scenario, the processes of Embodiment 5 to Embodiment 8 can be adopted.

[0164] Embodiment 5:

[0165] The base station configures only SRB1 on the direct connection path, and the remote terminal device does not need to send a PC5-RRC message to trigger the target relay terminal device to enter the RRC connected state. At this time, the target relay terminal device is already in the RRC connected state. As Figure 12 shown, a method for triggering a relay terminal device to enter the connected state includes the following steps:

[0166] S1201. The remote terminal device performs uplink and downlink multipath transmission with the base station.

[0167] S1202. The remote terminal device performs measurement and reporting according to network configuration.

[0168] S1203. The base station determines to change the non-direct connection path according to the measurement results reported by the terminal device, and selects a target relay terminal device; the base station sends an RRC reconfiguration message to the remote terminal device, which includes at least one or more of the following information: the local ID information of the remote terminal device (if an update is required), the L2 ID information of the target relay terminal device, the SRAP related configuration (configuring only SRB1 on the direct connection path), etc.

[0169] S1204. The remote terminal device establishes a PC5 connection with the target relay terminal device; the remote terminal device determines that it does not need to send a PC5-RRC message to the target relay terminal device according to the content of the RRC reconfiguration message, for triggering the relay terminal device to enter the RRC connected state.

[0170] S1205. The base station sends an RRC reconfiguration message to the target relay terminal device, instructing the target relay terminal device to add the remote terminal device; the message content includes at least the following: the local ID information and L2 ID information of the remote terminal device, the SRAP related configuration, etc.

[0171] S1206. The remote terminal device determines to send an RRC reconfiguration complete message through the direct connection path or the non-direct connection path according to the content of the RRC reconfiguration message. If the base station does not configure SRB1 on the non-direct connection path, it is sent through the direct connection path.

[0172] S1207. The base station sends an RRC reconfiguration message to the source relay terminal device, instructing the source relay terminal device to release the remote terminal device.

[0173] S1208. The remote terminal device releases the PC5 connection with the source terminal device.

[0174] S1209. The remote terminal device performs uplink and downlink multipath transmission with the base station.

[0175] Among them, steps S1204 and S1205 have no sequential association and depend on the implementation of the terminal device and the network side device.

[0176] Embodiment Six:

[0177] The base station configures SRB1 on the non-direct connection path (such as configuring split SRB1, SRB1 redundant transmission, or only configuring SRB1 on the non-direct connection path, etc.), indicating that the remote terminal device does not need to send a PC5-RRC message, and triggering the target relay terminal device to enter the connected state by sending an SRB1 message (i.e., the RRC reconfiguration completion message) on the non-direct connection path. As Figure 13 shown, a method for triggering a relay terminal device to enter the connected state includes the following steps:

[0178] S1301 - S1302 are the same as S1201 - S1202 in Embodiment Five.

[0179] S1303: The base station determines to change the non-direct connection path according to the measurement results reported by the terminal device, and selects the target relay terminal device; the base station sends an RRC reconfiguration message to the remote terminal device, and the RRC reconfiguration message includes at least one or more of the following information: the local ID information of the remote terminal device (if it needs to be updated), the L2 ID information of the target relay terminal device, the SRAP-related configuration (including configuring SRB1 on the non-direct connection path), etc.

[0180] S1304: The remote terminal device establishes a PC5 connection with the target relay terminal device; the remote terminal device determines according to the content of the RRC reconfiguration message that it does not need to send a PC5-RRC message to the target relay terminal device to trigger the target relay terminal device to enter the RRC connected state; the remote terminal device determines according to the content of the RRC reconfiguration message that it needs to send an RRC reconfiguration completion message through the non-direct connection path; the remote terminal device sends the RRC reconfiguration completion message to the target relay terminal device through a specific default configuration (SL-RLC1).

[0181] S1305: When the target relay terminal device receives the RRC message sent by the remote terminal device through a specific default configuration (SL-RLC1), if the relay terminal device is not in the RRC connected state at this time, it performs relevant operations to enter the RRC connected state. If the relay terminal device is in the RRC idle state at this time, it performs the RRC connection establishment process; if the relay terminal device is in the RRC inactive state at this time, it performs the RRC connection recovery process.

[0182] S1306: The base station sends an RRC reconfiguration message to the target relay terminal device, instructing the target relay terminal device to add the remote terminal device; the message content includes at least the following content: the local ID information and L2 ID information of the remote terminal device, the SRAP-related configuration, etc.

[0183] S1307. The target relay terminal device sends the RRC message (i.e., the RRC reconfiguration complete message) sent by the remote terminal device to the base station according to the base station configuration.

[0184] S1308 - S1310 are the same as S1207 - S1209 in Embodiment 5 and will not be elaborated here.

[0185] Embodiment 7:

[0186] The base station adds direct indication information in the RRC reconfiguration message to indicate that the remote terminal device sends a PC5 - RRC message to trigger the target relay terminal device to enter the RRC connected state. As Figure 14 shown, a method for triggering a relay terminal device to enter the connected state includes the following steps:

[0187] S1401 - S1402 are the same as S1201 - S1202 in Embodiment 5 and will not be elaborated here.

[0188] S1403. The base station determines to change the non - direct connection path according to the measurement results reported by the terminal device and selects a target relay terminal device; the base station sends an RRC reconfiguration message to the remote terminal device, and the RRC reconfiguration message includes at least one or more of the following information: the local ID information of the remote terminal device (if it needs to be updated), the L2 ID information of the target relay terminal device, SRAP - related configuration, and a second cell, where the second cell is used to indicate that the remote terminal device sends a PC5 - RRC message to the relay terminal device to trigger the target relay terminal device to enter the RRC connected state.

[0189] S1404. The remote terminal device establishes a PC5 connection with the target relay terminal device; the remote terminal device determines that it needs to send a PC5 - RRC message to the target relay terminal device to trigger the target relay terminal device to enter the RRC connected state according to the second cell in the RRC reconfiguration message.

[0190] S1405. The remote terminal device sends a PC5 - RRC message to the target relay terminal device, and the PC5 - RRC message includes at least a first cell, where the first cell is used to trigger the relay terminal device to enter the RRC connected state.

[0191] S1406. The target relay terminal device receives the PC5 - RRC message sent by the remote terminal device. If the relay terminal device is not in the RRC connected state at this time, it performs relevant operations to enter the RRC connected state according to the first cell: if the relay terminal device is in the RRC idle state at this time, it performs the RRC connection establishment process; if the relay terminal device is in the RRC inactive state at this time, it performs the RRC connection restoration process.

[0192] S1407. The base station sends an RRC reconfiguration message to the target relay terminal device, instructing the target relay terminal device to add a remote terminal device. The message content includes at least the following: the local ID of the remote terminal device and the L2 ID information, SRAP-related configurations, etc.

[0193] S1408. The remote terminal device sends an RRC reconfiguration complete message to the base station through a direct connection path (or non-direct connection path) according to the base station configuration.

[0194] S1409 - S1411 are the same as S1207 - S1209 in Embodiment 5 and will not be elaborated here.

[0195] Among them, S1408 has no sequential relationship with S1404 - S1407 and can be after S1403, specifically depending on the implementation of the terminal device.

[0196] Embodiment 8:

[0197] Based on the implementation or relevant indication information obtained during the interaction with the target relay terminal device, the remote terminal device independently determines to send a PC5 - RRC message to trigger the target relay terminal device to enter the RRC connected state. As Figure 15 shown, a method for triggering a relay terminal device to enter the connected state includes the following steps:

[0198] S1501 - S1502 are the same as S1201 - S1202 in Embodiment 5 and will not be elaborated here.

[0199] S1503. The base station determines to change the non-direct connection path according to the measurement results reported by the terminal device and selects a target relay terminal device. The base station sends an RRC reconfiguration message to the remote terminal device, and the RRC reconfiguration message includes at least one or more of the following information: the local ID information of the remote terminal device (if an update is required), the L2 ID information of the target relay terminal device, SRAP-related configurations, etc.

[0200] S1504. The remote terminal device establishes a PC5 connection with the target relay terminal device and obtains relevant indication information during the interaction, such as the RRC status indication information of the target relay terminal device, or the information indicating that the target relay terminal device needs to be triggered to enter the RRC connected state, etc. The remote terminal device determines that it needs to send a PC5 - RRC message to the target relay terminal device to trigger the target relay terminal device to enter the RRC connected state according to the relevant indication information.

[0201] S1505 - S1511 are the same as S1405 - S1411 in Embodiment 7 and will not be elaborated here;

[0202] Among them, S1508 has no sequence relationship with S1504 to S1507, and it can be after S1503, specifically depending on the implementation of the terminal device.

[0203] Based on the same inventive concept, related devices such as a remote terminal device, a relay terminal device, and a communication system are also provided in the embodiments of the present disclosure, as described in the following embodiments. Since the principle of solving problems in the embodiments of the related devices is similar to that of the above method embodiments, the implementation of the embodiments of the related devices can refer to the implementation of the above method embodiments, and the repeated parts will not be described again.

[0204] Figure 16 The structural schematic diagram of a remote terminal device in the embodiments of the present disclosure is shown, as Figure 16 As shown, the remote terminal device provided in the embodiments of the present disclosure includes: a configuration message receiving module 1610 and a signaling message sending module 1620.

[0205] Among them, the configuration message receiving module 1610 is used to receive the RRC reconfiguration message sent by the network side device;

[0206] The signaling message sending module 1620 is used to send a first signaling message to the relay terminal device, and the first signaling message is used to trigger the relay terminal device in the RRC idle state to perform RRC connection establishment or trigger the relay terminal device in the RRC inactive state to perform RRC connection restoration.

[0207] It should be noted that the first signaling message includes at least one of a direct link interface PC5 - RRC message or an RRC reconfiguration complete message; among them, when the first signaling message includes a PC5 - RRC message, the PC5 - RRC message includes at least a first cell, and the first cell is used to trigger the relay terminal device to enter the RRC connected state; when the first signaling message includes an RRC reconfiguration complete message, the RRC reconfiguration complete message is sent by the remote terminal device through the default configured direct link - radio link control SL - RLC1.

[0208] In an embodiment of the present disclosure, when the first signaling message includes an RRC reconfiguration complete message, the signaling message sending module 1620 is used to, when the RRC reconfiguration message contains the relevant configuration information of SRB1 on the non - direct path, send the RRC reconfiguration complete message to the relay terminal device through the default configured SL - RLC1, so that the relay terminal device in the RRC idle state performs the relevant operations of RRC connection establishment or the relay terminal device in the RRC inactive state performs the relevant operations of RRC connection restoration.

[0209] It should be noted that the relevant configuration information of SRB1 on the non-direct connection path includes at least one of the following: an independent SRB1 is configured on the non-direct connection path, an SRB1 supporting separation is configured and the primary RLC entity of the separated SRB1 is configured on the non-direct connection path, or an SRB1 supporting redundant transmission is configured.

[0210] In an embodiment of the present disclosure, when the first signaling message includes a PC5-RRC message, the signaling message sending module 1620 is configured to send a PC5-RRC message to the relay terminal device when the RRC reconfiguration message includes a second cell; or when SRB1 is not configured on the non-direct connection path in the RRC reconfiguration message, or an SRB1 supporting separation is configured and the primary RLC entity of the separated SRB1 is not configured on the non-direct connection path, the remote terminal device sends a PC5-RRC message to the relay terminal device; or when it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, a PC5-RRC message is sent to the relay terminal device.

[0211] It should be noted that when the RRC reconfiguration message includes a second cell, the second cell is used to indicate that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

[0212] In an embodiment of the present disclosure, when it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, the signaling message sending module 1620 is configured to, during the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the remote terminal device obtains the RRC status information of the relay terminal device and the obtained RRC status information of the relay terminal device is in the RRC idle state or the RRC inactive state, send a PC5-RRC message to the relay terminal device; or during the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the relay terminal device indicates that the remote terminal device needs to send a PC5-RRC message, send a PC5-RRC message to the relay terminal device.

[0213] In an embodiment, the remote terminal device further includes a configuration message completion sending module not shown in the drawings, which is configured to send an RRC reconfiguration completion message to the network side device through the direct connection path and / or the non-direct connection path.

[0214] In an embodiment of the present disclosure, a configuration message sending module is configured to send an RRC reconfiguration complete message to a network-side device via a direct path and a non-direct path when a split SRB1 supporting redundant transmission is configured in the RRC reconfiguration message; send an RRC reconfiguration complete message to the network-side device via the direct path when a split SRB1 is configured in the RRC reconfiguration message and the primary RLC entity of the split SRB1 is configured on the direct path, or an independent SRB1 is configured on the direct path; and send an RRC reconfiguration complete message to the network-side device via the direct path SRB1 when the remote terminal device needs to send a PC5-RRC message to the relay terminal device and an available SRB1 is configured on the direct path.

[0215] It should be noted that when the remote terminal device needs to send a PC5-RRC message to the relay terminal device and an available SRB1 is configured on the direct path, the available SRB1 configured on the direct path includes at least one of the following: an independent SRB1 is configured on the direct path, or a split SRB1 is configured and the primary RLC entity of the split SRB1 is configured on the direct path.

[0216] It should be noted that the RRC reconfiguration message includes at least one of the following information: local ID information of the remote terminal device; source layer 2 ID information of the relay terminal device; straight-through link relay adaptation protocol SRAP configuration information; SRB1-related configuration information, and the SRB1-related configuration information includes at least one of the following: an independent SRB1 is configured on the direct path and / or the non-direct path, a split SRB1 is configured, or an SRB1 supporting redundant transmission is configured; and a second cell for indicating that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

[0217] In an embodiment of the present disclosure, an RRC reconfiguration message sent by a network-side device is received; a first signaling message is sent to the relay terminal device, and the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection recovery. While ensuring flexible network configuration, the relay terminal device is timely triggered to enter the connected state, thereby implementing a multi-path communication function, reducing end-to-end latency, avoiding service interruption or rate reduction problems in the case of non-direct path change scenarios, improving network throughput and reliability, and enhancing the user experience.

[0218] Figure 17 FIG. shows a schematic structural diagram of a network-side device provided in an embodiment of the present disclosure. As Figure 17As shown, in one embodiment, the network-side device provided by the embodiments of the present disclosure includes a configuration message sending module 1710, configured to send an RRC reconfiguration message to a remote terminal device, so that the remote terminal device sends a first signaling message to a relay terminal device according to the RRC reconfiguration message, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration.

[0219] Figure 18 FIG. shows a schematic structural diagram of a relay terminal device provided in the embodiments of the present disclosure. As Figure 18 shown, in one embodiment, the relay terminal device provided by the embodiments of the present disclosure includes a signaling message receiving module 1810, configured to receive a first signaling message sent by a remote terminal device; an RRC connection module 1820, configured to perform an RRC connection establishment operation when the relay terminal device is in the RRC idle state; and perform an RRC connection restoration operation when the relay terminal device is in the RRC inactive state.

[0220] In addition, in one embodiment, the embodiments of the present disclosure further provide a communication system, including a network-side device, a relay terminal device, and a remote terminal device, where the network-side device is configured to send an RRC reconfiguration message to the remote terminal device; the remote terminal device is configured to receive the radio resource control (RRC) reconfiguration message sent by the network-side device; send a first signaling message to the relay terminal device, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration, and the remote terminal device is based on the RRC reconfiguration message; the relay terminal device is configured to receive the first signaling message sent by the remote terminal device; perform an RRC connection establishment operation when the relay terminal device is in the RRC idle state; and perform an RRC connection restoration operation when the relay terminal device is in the RRC inactive state.

[0221] Those skilled in the art to which the present invention pertains can understand that various aspects of the present invention can be implemented as a system, a method, or a program product. Therefore, various aspects of the present invention can be specifically implemented in the following forms, namely: a complete hardware implementation manner, a complete software implementation manner (including firmware, microcode, etc.), or an implementation manner combining hardware and software aspects, which can be collectively referred to as "circuit", "module", or "system" here.

[0222] Next, reference is made to Figure 19 to describe the electronic device 1900 according to this embodiment of the present invention. Figure 19 The electronic device 1900 shown is merely an example and should not impose any limitation on the functions and usage scope of the embodiments of the present invention.

[0223] As shown Figure 19 in the figure, the electronic device 1900 is presented in the form of a general computing device. The components of the electronic device 1900 may include, but are not limited to: at least one of the above-mentioned processing units 1910, at least one of the above-mentioned storage units 1920, and a bus 1930 connecting different system components (including the storage unit 1920 and the processing unit 1910).

[0224] Among them, the storage unit stores program code, and the program code can be executed by the processing unit 1910, so that the processing unit 1910 executes the steps according to various exemplary embodiments of the present invention described in the "Exemplary Method" section of the present specification above. For example, the processing unit 1910 may execute as shown Figure 2 in the figure to receive a Radio Resource Control (RRC) reconfiguration message sent by a network-side device; and send a first signaling message to a relay terminal device, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection recovery.

[0225] For example, the processing unit 1910 may execute as shown Figure 6 in the figure to send an RRC reconfiguration message to a remote terminal device, so that the remote terminal device sends a first signaling message to the relay terminal device according to the RRC reconfiguration message, and the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection recovery.

[0226] For example, the processing unit 1910 may execute as shown Figure 7 in the figure to receive the first signaling message sent by the remote terminal device; when the relay terminal device is in the RRC idle state, perform the operation of RRC connection establishment; when the relay terminal device is in the RRC inactive state, perform the operation of RRC connection recovery.

[0227] The storage unit 1920 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 19201 and / or a cache storage unit 19202, and may further include a read-only storage unit (ROM) 19203.

[0228] The storage unit 1920 may further include a program / utility 19204 having a set (at least one) of program modules 19205. Such program modules 19205 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0229] The bus 1930 can represent one or more of several types of bus structures, including a memory unit bus or a memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of the various bus structures.

[0230] The electronic device 1900 can also communicate with one or more external devices 1940 (such as a keyboard, a pointing device, a Bluetooth device, etc.), and can also communicate with one or more devices that enable a user to interact with the system, and / or communicate with any device that enables the electronic device 1900 to communicate with one or more other computing devices (such as a router, a modem, etc.). Such communication can be carried out through the input / output (I / O) interface 1950. Moreover, the system can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) through the network adapter 1960. As Figure 19 shown, the network adapter 1960 communicates with other modules of the electronic device 1900 through the bus 1930. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 1900, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0231] Through the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software, or can be implemented by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product, and the software product can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.

[0232] In an exemplary embodiment of the present disclosure, there is also provided a computer-readable storage medium, on which a program product capable of implementing the above method of this specification is stored. In some possible implementation manners, various aspects of the present invention can also be implemented in the form of a program product, which includes program code. When the program product runs on a terminal device, the program code is used to enable the terminal device to execute the steps according to various exemplary embodiments of the present invention described in the above "Exemplary Method" section of this specification.

[0233] A program product for implementing the above method according to an embodiment of the present invention is described. It can be a portable compact disc read-only memory (CD-ROM) and includes program code, and can run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited to this. In this document, a readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in combination with an instruction execution system, device, or component.

[0234] The program product can adopt any combination of one or more readable media. The readable media can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or component, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0235] The computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which the readable program code is carried. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable signal medium can also be any readable medium other than the readable storage medium, and this readable medium can send, propagate, or transmit a program for use by or in combination with an instruction execution system, device, or component.

[0236] The program code contained on the readable medium can be transmitted by any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination of the above.

[0237] The program code for performing the operations of the present invention can be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, C++, etc., and also including conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, executed as a stand-alone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user's computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (e.g., by connecting through the Internet using an Internet service provider).

[0238] It should be noted that although several modules or units of a device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more of the above-described modules or units can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0239] In addition, although the steps of the methods in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in that specific order, or that all of the steps shown must be performed to achieve the desired result. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step for execution, and / or one step may be decomposed into multiple steps for execution, etc.

[0240] From the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein can be implemented by software, or by a combination of software and necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to cause a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the methods according to the embodiments of the present disclosure.

[0241] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A method for triggering a relay terminal device to enter a connected state, characterized in that, Applied to a remote terminal device, the method includes: Receiving a Radio Resource Control (RRC) reconfiguration message sent by a network-side device; Sending a first signaling message to a relay terminal device, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration; Wherein, when the first signaling message includes an RRC reconfiguration completion message, the sending the first signaling message to the relay terminal device includes: when the RRC reconfiguration message contains configuration information related to Signaling Radio Bearer 1 (SRB1) on the non-direct path, sending the RRC reconfiguration completion message to the relay terminal device through the default-configured SL-RLC1, so that a relay terminal device in the RRC idle state performs related operations for RRC connection establishment or a relay terminal device in the RRC inactive state performs related operations for RRC connection restoration, and the configuration information related to SRB1 on the non-direct path includes SRB1 with redundant transmission configured on the non-direct path; When the first signaling message includes a PC5-RRC message, sending the first signaling message to the relay terminal device includes: when the RRC reconfiguration message does not configure SRB1 on the non-direct path, the remote terminal device sends a PC5-RRC message to the relay terminal device.

2. The method according to claim 1, wherein The first signaling message includes at least one of a ProSe Radio Resource Control (PC5-RRC) message or an RRC reconfiguration completion message; Wherein, when the first signaling message includes a PC5-RRC message, the PC5-RRC message includes at least a first cell, and the first cell is used to trigger the relay terminal device to enter the RRC connected state; When the first signaling message includes an RRC reconfiguration completion message, the RRC reconfiguration completion message is sent by the remote terminal device through the default-configured direct link - Radio Link Control (SL-RLC1).

3. The method according to claim 1, wherein The configuration information related to SRB1 on the non-direct path includes at least one of the following: SRB1 configured independently on the non-direct path, SRB1 configured to support separation and the primary RLC entity of the separated SRB1 is configured on the non-direct path.

4. The method according to claim 1 or 2, characterized in that When the first signaling message includes a PC5-RRC message, the sending the first signaling message to the relay terminal device includes at least one of the following: When the RRC reconfiguration message contains a second cell, sending a PC5-RRC message to the relay terminal device; or When the RRC reconfiguration message configures a separated SRB1 and the primary RLC entity configuration of the separated SRB1 is not configured on the non-direct path, the remote terminal device sends a PC5-RRC message to the relay terminal device; Or When it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, sending a PC5-RRC message to the relay terminal device.

5. The method according to claim 4, wherein When the RRC reconfiguration message contains a second cell, the second cell is used to indicate that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

6. The method according to claim 4, characterized in that, When it is determined that a PC5-RRC message needs to be sent during the interaction between the remote terminal device and the relay terminal device, sending a first signaling message to the relay terminal device includes at least one of the following: During the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the remote terminal device obtains the RRC status information of the relay terminal device and the obtained RRC status information of the relay terminal device is in the RRC idle state or the RRC inactive state, send a PC5-RRC message to the relay terminal device; Or During the direct link discovery process or the PC5 connection establishment process between the remote terminal device and the relay terminal device, when the relay terminal device indicates that the remote terminal device needs to send a PC5-RRC message, send a PC5-RRC message to the relay terminal device.

7. The method according to claim 1, wherein The method further includes: Sending an RRC reconfiguration complete message to the network side device through a direct path and / or an indirect path.

8. The method according to claim 7, characterized in that, The sending of the RRC reconfiguration complete message to the network side device through a direct path and / or an indirect path includes at least one of the following: When a split SRB1 supporting redundant transmission is configured in the RRC reconfiguration message, send the RRC reconfiguration complete message to the network side device through a direct path and an indirect path; When a split SRB1 is configured in the RRC reconfiguration message and the primary RLC entity of the split SRB1 is configured on the direct path, or an independent SRB1 is configured on the direct path, send the RRC reconfiguration complete message to the network side device through the direct path; When the remote terminal device needs to send a PC5-RRC message to the relay terminal device and an available SRB1 is configured on the direct path, send the RRC reconfiguration complete message to the network side device through the SRB1 on the direct path.

9. The method according to claim 8, characterized in that When the remote terminal device needs to send a PC5-RRC message to the relay terminal device and an available SRB1 is configured on the direct path, the configuration of the available SRB1 on the direct path includes at least one of the following: an independent SRB1 is configured on the direct path, or a split SRB1 is configured and the primary RLC entity of the split SRB1 is configured on the direct path.

10. The method according to claim 1, characterized in that, The RRC reconfiguration message includes at least one of the following information: Local ID information of the remote terminal device; Source layer 2 ID information of the relay terminal device; Direct link relay adaptation protocol SRAP configuration information; SRB1 related configuration information, where the SRB1 related configuration information includes at least one of the following: an independent SRB1 is configured on the direct path and / or the indirect path, a split SRB1 is configured, a SRB1 supporting redundant transmission is configured; A second cell for indicating that the remote terminal device needs to send a PC5-RRC message to the relay terminal device.

11. A method for triggering a relay terminal device to enter a connected state, characterized in that, Applied to the network side device, the method includes: Send an RRC reconfiguration message to the remote terminal device, so that the remote terminal device sends a first signaling message to the relay terminal device according to the RRC reconfiguration message. The first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection resume. When the first signaling message includes an RRC reconfiguration complete message, when the RRC reconfiguration message contains configuration information related to the signaling radio bearer SRB1 on the non-direct path, send the RRC reconfiguration complete message to the relay terminal device through the default-configured SL-RLC1, so that a relay terminal device in the RRC idle state performs related operations for RRC connection establishment or a relay terminal device in the RRC inactive state performs related operations for RRC connection resume. The configuration information related to SRB1 on the non-direct path includes SRB1 configured with redundant transmission on the non-direct path; when the first signaling message includes a PC5-RRC message, when the RRC reconfiguration message does not configure SRB1 on the non-direct path, the remote terminal device sends a PC5-RRC message to the relay terminal device.

12. A method for triggering a relay terminal device to enter a connected state, characterized in that, Applied to a relay terminal device, the method includes: Receive a first signaling message sent by a remote terminal device. When the first signaling message includes an RRC reconfiguration complete message, when the RRC reconfiguration message received by the remote terminal device from the network-side device contains configuration information related to the signaling radio bearer SRB1 on the non-direct path, receive the RRC reconfiguration complete message sent by the remote terminal device through the default-configured SL-RLC1, so that a relay terminal device in the RRC idle state performs related operations for RRC connection establishment or a relay terminal device in the RRC inactive state performs related operations for RRC connection resume. The configuration information related to SRB1 on the non-direct path includes SRB1 configured with redundant transmission on the non-direct path; when the first signaling message includes a PC5-RRC message, when the RRC reconfiguration message does not configure SRB1 on the non-direct path, receive the PC5-RRC message sent by the remote terminal device; When the relay terminal device is in the RRC idle state, perform an operation of establishing an RRC connection; When the relay terminal device is in the RRC inactive state, perform an operation of resuming an RRC connection.

13. A remote terminal device, characterized in that, Includes: A configuration message receiving module, configured to receive an RRC reconfiguration message sent by a network-side device; A signaling message sending module, configured to send a first signaling message to a relay terminal device, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration; when the first signaling message includes an RRC reconfiguration completion message, and when the RRC reconfiguration message includes configuration information related to the signaling radio bearer SRB1 on the non-direct path, the RRC reconfiguration completion message is sent to the relay terminal device through the default-configured SL-RLC1, so that a relay terminal device in the RRC idle state performs related operations for RRC connection establishment or a relay terminal device in the RRC inactive state performs related operations for RRC connection restoration, and the configuration information related to SRB1 on the non-direct path includes SRB1 configured with redundant transmission on the non-direct path; when the first signaling message includes a PC5-RRC message, and when the RRC reconfiguration message does not configure SRB1 on the non-direct path, the remote terminal device sends the PC5-RRC message to the relay terminal device.

14. A network-side device, characterized in that, including: A configuration message sending module, configured to send an RRC reconfiguration message to a remote terminal device, so that the remote terminal device sends a first signaling message to a relay terminal device according to the RRC reconfiguration message, where the first signaling message is used to trigger a relay terminal device in the RRC idle state to perform RRC connection establishment or trigger a relay terminal device in the RRC inactive state to perform RRC connection restoration; when the first signaling message includes an RRC reconfiguration completion message, and when the RRC reconfiguration message includes configuration information related to the signaling radio bearer SRB1 on the non-direct path, the RRC reconfiguration completion message is sent to the relay terminal device through the default-configured SL-RLC1, so that a relay terminal device in the RRC idle state performs related operations for RRC connection establishment or a relay terminal device in the RRC inactive state performs related operations for RRC connection restoration, and the configuration information related to SRB1 on the non-direct path includes SRB1 configured with redundant transmission on the non-direct path; when the first signaling message includes a PC5-RRC message, and when the RRC reconfiguration message does not configure SRB1 on the non-direct path, the remote terminal device sends the PC5-RRC message to the relay terminal device.

15. A relay terminal device, characterized in that, including: A signaling message receiving module, configured to receive a first signaling message sent by a remote terminal device. When the first signaling message includes an RRC reconfiguration complete message, and when the RRC reconfiguration message sent by the network-side device to the remote terminal device contains configuration information related to signaling radio bearer SRB1 on the non-direct path, the RRC reconfiguration complete message sent by the remote terminal device is received through the default-configured SL-RLC1, so that the relay terminal device in the RRC idle state performs related operations for RRC connection establishment or the relay terminal device in the RRC inactive state performs related operations for RRC connection restoration. The configuration information related to SRB1 on the non-direct path includes SRB1 with redundant transmission configured on the non-direct path. When the first signaling message includes a PC5-RRC message, and when SRB1 is not configured on the non-direct path in the RRC reconfiguration message, the PC5-RRC message sent by the remote terminal device is received. An RRC connection module, configured to perform an RRC connection establishment operation when the relay terminal device is in the RRC idle state; and perform an RRC connection restoration operation when the relay terminal device is in the RRC inactive state.

16. A communication system, characterized in that, It includes a network-side device, a relay terminal device, and a remote terminal device, where the network-side device is configured to send an RRC reconfiguration message to the remote terminal device; the remote terminal device is configured to receive the radio resource control (RRC) reconfiguration message sent by the network-side device; send a first signaling message to the relay terminal device, where the first signaling message is used to trigger the relay terminal device in the RRC idle state to perform RRC connection establishment or trigger the relay terminal device in the RRC inactive state to perform RRC connection restoration; when the first signaling message includes an RRC reconfiguration complete message, and when the RRC reconfiguration message contains configuration information related to signaling radio bearer SRB1 on the non-direct path, the RRC reconfiguration complete message is sent to the relay terminal device through the default-configured SL-RLC1, so that the relay terminal device in the RRC idle state performs related operations for RRC connection establishment or the relay terminal device in the RRC inactive state performs related operations for RRC connection restoration. The configuration information related to SRB1 on the non-direct path includes SRB1 with redundant transmission configured on the non-direct path. When the first signaling message includes a PC5-RRC message, and when SRB1 is not configured on the non-direct path in the RRC reconfiguration message, the remote terminal device sends the PC5-RRC message to the relay terminal device; the relay terminal device is configured to receive the first signaling message sent by the remote terminal device; perform an RRC connection establishment operation when the relay terminal device is in the RRC idle state; and perform an RRC connection restoration operation when the relay terminal device is in the RRC inactive state.

17. An electronic device, characterized in that, It includes: a processor; and a memory, configured to store executable instructions of the processor; Wherein, the processor is configured to execute the method for triggering the relay terminal device to enter the connected state according to any one of claims 1 to 10 by executing the executable instructions, or execute the method for triggering the relay terminal device to enter the connected state according to claim 11, or execute the method for triggering the relay terminal device to enter the connected state according to claim 12.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for triggering the relay terminal device to enter the connected state according to any one of claims 1 to 10, or implements the method for triggering the relay terminal device to enter the connected state according to claim 11, or implements the method for triggering the relay terminal device to enter the connected state according to claim 12.

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