Relay connection establishment method, electronic device and storage medium

Abstract

The present application discloses a relay connection establishment method, the method including: a relay terminal device sending a first connection establishment request message to a network device, the first connection establishment request message carrying a connection establishment cause value, the first connection establishment request message being used to request a connection establishment between the relay terminal device and the network device. The present application further discloses another relay connection establishment method, an electronic device, and a storage medium.

Description

[Technical Field]

[0001] The present application relates to the field of sidelink transmission technology, and in particular to a relay connection establishment method, an electronic device, and a storage medium. [Background technology]

[0002] In NR-V2X (New Radio-Vehicle to Everything) systems, the process of establishing a connection from terminal equipment to network equipment based on Layer 2 relay is not yet clear. Summary of the Invention [Problem to be solved by the invention]

[0003] The embodiments of the present application provide a relay connection establishment method, an electronic device, and a storage medium that clarify the process of establishing a connection from a terminal device to a network device based on Layer 2 relay. [Means for solving the problem]

[0004] In a first aspect, an embodiment of the present application provides a relay connection establishment method, the method including: a relay terminal device sending a first connection establishment request message to a network device; The first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request the establishment of a connection between the relay terminal device and the network device.

[0005] In a second aspect, an embodiment of the present application provides a relay connection establishment method, the method including: a remote terminal device transmitting first information to a relay terminal device, such that the relay terminal device transmits first connection establishment request information to a network device.

[0006] In a third aspect, an embodiment of the present application provides a relay connection establishment method, the method including: a network device receiving a first connection establishment request message sent from a relay terminal device, the first connection establishment request message carrying a connection establishment cause value, the first connection establishment request message being used to request connection establishment between the relay terminal device and the network device.

[0007] In a fourth aspect, an embodiment of the present application provides a relay terminal device, the relay terminal device comprising: a first sending unit configured to send a first connection establishment request message to the network device; The first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request the establishment of a connection between the relay terminal device and the network device.

[0008] In a fifth aspect, embodiments of the present application provide a remote terminal device, the remote terminal device comprising: The network device further comprises a second sending unit configured to send first information to the relay terminal device, so that the relay terminal device sends first connection establishment request information to the network device.

[0009] In a sixth aspect, embodiments of the present application provide a network device, the network device comprising: and a sixth receiving unit configured to receive a first connection establishment request message sent from a relay terminal device, the first connection establishment request message carrying a connection establishment cause value, the first connection establishment request message being used to request the establishment of a connection between the relay terminal device and the network device.

[0010] In a seventh aspect, an embodiment of the present application provides a relay terminal device, the relay terminal device comprising: a processor; and a memory for storing a computer program executable by the processor, the processor performing steps of a relay connection establishment method executed by the relay terminal device when the computer program is executed.

[0011] In an eighth aspect, an embodiment of the present application provides a remote terminal device, the remote terminal device comprising: a processor; and a memory storing a computer program executable by the processor, the processor performing steps of the relay connection establishment method executed by the remote terminal device when the computer program is executed.

[0012] In a ninth aspect, an embodiment of the present application provides a network device, the network device comprising: a processor; and a memory storing a computer program executable by the processor, the processor performing steps of a relay connection establishment method executed by the network device when the computer program is executed.

[0013] In a tenth aspect, an embodiment of the present application provides a chip, the chip comprising a processor, the processor calling and executing a computer program from a memory, thereby causing a relay terminal device equipped with the chip to perform the relay connection establishment method performed by the above-mentioned transmitting device.

[0014] In an eleventh aspect, an embodiment of the present application provides a chip, the chip comprising a processor, the processor calling and executing a computer program from a memory, thereby causing a remote terminal device equipped with the chip to perform the relay connection establishment method performed by the receiving device described above.

[0015] In a twelfth aspect, an embodiment of the present application provides a chip, the chip comprising a processor, the processor calling and executing a computer program from a memory, thereby causing a network device equipped with the chip to perform the relay connection establishment method performed by the receiving device described above.

[0016] In a thirteenth aspect, an embodiment of the present application provides a storage medium, the storage medium storing an executable program, and when the executable program is executed by a processor, realizing the relay connection establishment method performed by the relay terminal device described above.

[0017] In a fourteenth aspect, an embodiment of the present application provides a storage medium, the storage medium storing an executable program, the executable program, when executed by a processor, realizing the relay connection establishment method performed by the remote terminal device described above.

[0018] In a fifteenth aspect, an embodiment of the present application provides a storage medium, the storage medium storing an executable program, and when the executable program is executed by a processor, realizing the relay connection establishment method performed by the above-mentioned network device.

[0019] In a sixteenth aspect, an embodiment of the present application provides a computer program product, the computer program product including computer program instructions causing a computer to perform the relay connection establishment method executed by the remote terminal equipment described above.

[0020] In a seventeenth aspect, an embodiment of the present application provides a computer program product, the computer program product including computer program instructions causing a computer to execute the relay connection establishment method executed by the relay terminal device described above.

[0021] In an eighteenth aspect, an embodiment of the present application provides a computer program product, the computer program product including computer program instructions causing a computer to execute the relay connection establishment method executed by the network device described above.

[0022] In a nineteenth aspect, an embodiment of the present application provides a computer program, which causes a computer to execute the relay connection establishment method executed by the relay terminal device described above.

[0023] In a twentieth aspect, an embodiment of the present application provides a computer program, which causes a computer to execute the relay connection establishment method executed by the remote terminal device described above.

[0024] In a twenty-first aspect, an embodiment of the present application provides a computer program, which causes a computer to execute the relay connection establishment method executed by the network device described above. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a flowchart of a transmission resource selection in a first mode of the present application; [Figure 2] 4 is a flowchart of a transmission resource selection in a second mode of the present application; [Figure 3] 1 is a flow chart of establishing a connection in a relay network according to an embodiment of the present application; [Figure 4] 4 is an optional process flowchart of a relay connection establishment method according to an embodiment of the present application; [Figure 5] 10 is a process flowchart of another option of a relay connection establishment method according to an embodiment of the present application; [Figure 6] 10 is a process flowchart of yet another option of a relay connection establishment method according to an embodiment of the present application; [Figure 7] 1 is a detailed process flowchart of establishing a relay connection according to an embodiment of the present application; [Figure 8] FIG. 2 is a schematic diagram of an optional configuration structure of a relay terminal device according to an embodiment of the present application; [Figure 9] FIG. 2 is a schematic diagram of an optional configuration structure of a remote terminal device according to an embodiment of the present application; [Figure 10] FIG. 2 is a schematic diagram of an optional configuration structure of a network device according to an embodiment of the present application; [Figure 11] 1 is a schematic diagram of a hardware configuration of an electronic device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to understand the features and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application will be described in detail below with reference to the drawings, and the accompanying drawings are for reference purposes only and are not intended to limit the embodiments of the present application.

[0027] Before describing the embodiments of the present application, a brief description of the related content will be given.

[0028] Device-to-device (D2D) communication is a transmission technology based on sidelink (SL). Unlike conventional cellular systems, which transmit and receive communication data via network equipment, D2D communication has higher spectral efficiency and lower transmission delay. Therefore, the vehicle Internet system adopts a D2D communication method (i.e., a direct device-to-device communication method). In a New Radio (NR) system, for D2D communication, the Third Generation Partnership Project (3GPP) defines two transmission modes: Mode 1 (also called Mode A) and Mode 2 (also called Mode B). Mode 1 is a mode in which a network device allocates transmission resources to a terminal device, and Mode 2 is a mode in which the terminal device autonomously selects transmission resources.

[0029] First mode: As shown in Figure 1, the transmission resources of the terminal device are allocated by the network device, and the terminal device transmits data on the sidelink based on the resources allocated by the network device. The network device may allocate resources to the terminal device for one-time transmission or for semi-static transmission.

[0030] Second mode: As shown in FIG. 2, the terminal device selects one transmission resource from the resource pool to transmit data.

[0031] The terminal device may acquire transmission resources using the first mode, may acquire transmission resources using the second mode, or may acquire transmission resources using both the first mode and the second mode. Here, the acquisition of transmission resources may be indicated in the form of a sidelink grant, for example, indicating the time-frequency locations of corresponding sidelink control channel (PSCCH) resources and sidelink shared channel (PSSCH) resources.

[0032] In NR V2X, terminal devices can autonomously initiate Hybrid Automatic Repeat reQuest (HARQ) retransmissions, and as an example, feedback-based HARQ retransmissions can be introduced for both unicast and multicast NR V2X communications.

[0033] In 3GPP version (Rel) 12 / 13, for ProSe (Proximity based Service), the location of the resource pool in the time domain, for example, the discontinuity of the resource pool in the time domain, is configured to enable the terminal device to transmit and / or receive data on the sidelink discontinuously, thereby achieving power saving effects.

[0034] In R14 / 15, the vehicular internet system is required for vehicle-to-vehicle communication scenarios, and is primarily aimed at services for communication between vehicles moving at relatively high speeds and communication between vehicles and people.

[0035] In V2X systems, the main problem to be solved is data transmission delay, since the in-vehicle system has a continuous power supply, so the system design requires continuous transmission and reception for the terminal equipment.

[0036] In R14, we study scenarios where wearable devices (FeD2D) access networks via mobile phones, especially in scenarios with low mobility and low power consumption. In the case of FeD2D, the network device can configure DRX for a remote device via a relay device.

[0037] The following briefly describes the connection establishment process of the terminal device.

[0038] Before initiating a call, a terminal device must first perform access control. Access control can be classified into two types from the perspective of the executor. The first type is performed by the terminal device itself, collectively referred to as Unified Access Control (UAC) in the NR system. The second type is performed by the network device based on an "RRC Establishment Cause" in a Radio Resource Control (RRC) Setup Request message. The key to the second type of access control is that when initiating a call in the terminal device's Non Access Stratum (NAS), a single "RRC Establishment Cause" can be obtained by mapping based on the access ID and access category. The "RRC Establishment Cause" is encoded in an RRC Setup Request message by the RRC layer and transmitted to the network device. How the network device performs access control based on the "RRC Establishment Cause" belongs to the internal algorithm of the network device and is implemented by the network device. If the network equipment accepts the RRCSetupRequest message initiated by the terminal equipment, it responds by sending an RRCSetup message, otherwise it rejects by sending an RRCReject message.

[0039] R13 introduces a Layer 3 relay-based UE-to-network relay function, i.e., a remote terminal device accesses a network through a relay terminal device. The relay terminal device performs the relay function of the network protocol (IP: Internet Protocol) layer and transmits data between the remote terminal device and the network device, and the remote terminal device and the relay terminal device are connected by a sidelink. The connection establishment process of the relay network is shown in Figure 3. In step 5, the relay terminal device reports the identification (ID) and IP information of the remote terminal device to the network device. Based on the report message, the network device learns the association relationship between the relay terminal device and the remote terminal device, and thereby performs corresponding bearer / session management and configuration so that the remote terminal device is connected to the network through the relay terminal device.

[0040] In the case of a UE-to-network relay function based on Layer 2 relaying, a remote terminal device accesses a network through a relay terminal device. The relay terminal device performs the relay function of the adaptation layer and transmits data between the remote terminal device and the network device, and the remote terminal device and the relay terminal device are connected by a sidelink. Here, the adaptation layer is located above the Radio Link Control (RLC) layer and below the Packet Data Convergence Protocol (PDCP) layer. However, the UE-to-network connection establishment process based on Layer 2 relaying has not been clarified in the related art.

[0041] In each embodiment of the present application, the magnitude of the number of each implementation process does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not be construed as any restriction on the implementation process of the embodiment of the present application.

[0042] The embodiments of the present application provide a relay connection establishment method that clarifies the connection establishment process based on Layer 2 relaying.

[0043] The optional processing process of the relay connection establishment method according to the embodiment of the present application, as shown in FIG. 4, includes the following steps:

[0044] In step S201, a relay terminal device sends a first connection establishment request message to a network device, where the first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request the establishment of a connection between the relay terminal device and the network device.

[0045] In some embodiments, when a relay UE needs to relay an uplink transmission for a remote UE or when a relay UE needs to relay a downlink transmission for a network device, the relay UE needs to enter an RRC connected state. As an example, the relay UE sends an RRC Setup Request message to the network device.

[0046] In some embodiments, the connection establishment cause value (establishmentCause) may be "relay", i.e., "establishmentCause=relay", which indicates that the connection requested to be established is used to perform transmission relay. In the embodiments of the present application, the specific format and content of the connection establishment cause value are not limited.

[0047] In some embodiments, the connection establishment cause value may be transmitted by a remote terminal device to a relay terminal device. For example, the connection establishment cause value may be transmitted by a remote terminal device to an AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value may be determined by an AS layer entity of the relay terminal device according to a protocol, and for example, the connection establishment cause value corresponds to a relaying method of the relay terminal device. For example, relaying based on Layer 2 corresponds to a connection establishment cause value of 1, and relaying based on Layer 3 corresponds to a connection establishment cause value of 2. Alternatively, the connection establishment cause value may be transmitted by the remote terminal device to a NAS layer entity of the relay terminal device, and then transmitted by the NAS layer entity to the AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value may be determined by a NAS layer entity of the relay terminal device according to a protocol, and then transmitted by the NAS layer entity to the AS layer entity of the relay terminal device.

[0048] In some embodiments, the relay connection establishment method may further include the following steps:

[0049] In step S202, the relay terminal device receives the first information transmitted from the remote terminal device.

[0050] In some embodiments, the first information may be an RRC message. As an example, the remote terminal device may send an RRC message to the relay terminal device, and the RRC message may carry a connection establishment cause value.

[0051] In some embodiments, the first information may be indication information for triggering the establishment of an RRC connection between the relay terminal device and the network device, and the indication information for triggering the establishment of an RRC connection between the relay terminal device and the network device may carry a connection establishment cause value. As an example, when a remote terminal device sends indication information to a relay terminal device, and the indication information is used to indicate the establishment of an RRC connection between the relay terminal device and the network device, the relay terminal device sends a first connection establishment request message to the network device after receiving the indication information. In this scenario, the relay terminal device needs to fill in the connection establishment cause value in the first connection establishment request message.

[0052] In some embodiments, the relay connection establishment method may further include the following steps:

[0053] In step S203, the prose layer entity or the PC5-RRC layer entity of the relay terminal device sends a notification message to the non-access layer entity, and the notification message is used to notify the non-access layer entity of the establishment of a non-access layer connection.

[0054] In some embodiments, the NAS layer entity of the relay terminal device conveys the establishmentCause value to the AS layer entity of the relay terminal device, triggering the AS layer entity of the relay terminal device to establish an RRC connection, and the AS layer entity of the relay terminal device fills an RRC connection establishment request message.

[0055] In some embodiments, the relay connection establishment method may further include the following steps:

[0056] In step S204, the relay terminal device receives the connection establishment success indication information transmitted from the network device.

[0057] In some embodiments, the connection establishment success indication information is used to indicate a successful connection between the relay terminal device and the network device.

[0058] In some embodiments, the relay connection establishment method may further include the following steps:

[0059] In step S205, the relay terminal device sends the connection establishment success indication information to the remote terminal device.

[0060] In some embodiments, if the connection between the relay terminal device and the network device is successful, the relay connection establishment method may further include the following steps:

[0061] In step S206, the relay terminal device sends first indication information to the network device, where the first indication information is used to indicate sidelink related information between the relay terminal device and the remote terminal device.

[0062] In some embodiments, the sidelink related information between the relay terminal device and the remote terminal device comprises: The sidelink radio link failure or sidelink RRC reconfiguration failure may include at least one of the following: QoS parameters and QoS profile(s) related to NR sidelink communication; a sidelink radio link failure or sidelink RRC reconfiguration failure has been detected; the sidelink UE capability information of the associated peer UE for unicast communication; and the RLC mode information of the sidelink data radio bearer(s) received from the associated peer UE for unicast communication.

[0063] In some embodiments, the relay connection establishment method may further include the following steps:

[0064] In step S207, the relay terminal device receives the first configuration information sent from the network device, and the first configuration information is used to transmit information between the relay terminal device and the remote terminal device.

[0065] In some embodiments, the first configuration information may be configuration information used for transmission between the relay terminal device and the remote terminal device. As an example, the first configuration information may be time-frequency resources used for transmission between the relay terminal device and the remote terminal device.

[0066] In some embodiments, if the connection establishment between the relay terminal device and the network device is successful, the relay connection establishment method may further include the following steps:

[0067] In step S208, the relay terminal device transfers at least one of the first information, the second information, the third information, and the fourth information to the network device.

[0068] In some embodiments, an intermediate terminal device receives first information transmitted from the remote terminal device, and the intermediate terminal device forwards the first information to the network device.

[0069] In some embodiments, the relay terminal device transmits second information to the network device, the second information being obtained from the first information by mapping in an adaptation layer of the relay terminal.

[0070] In some embodiments, an intermediate terminal device receives third information transmitted from the remote terminal device, and the intermediate terminal device forwards the third information to the network device.

[0071] In some embodiments, the relay terminal receives fourth information transmitted from the network device, and the relay terminal forwards the fourth information to the remote terminal device.

[0072] In some embodiments, the third information and the fourth information may both be RRC messages.

[0073] In some embodiments, the relay terminal device communicates the third information and / or the fourth information between the network device and the remote terminal device based on Layer 2 relaying and sidelink.

[0074] In some embodiments, the relay connection establishment method may further include the following steps:

[0075] In step S209, the relay terminal device receives the connection establishment failure instruction information transmitted from the network device.

[0076] In some embodiments, the connection establishment failure indication information is used to indicate a cause of the connection failure between the relay terminal device and the network device. As an example, the connection establishment failure indication information may be referred to as connection establishment refusal information.

[0077] In some embodiments, the reason for the failure of the connection between the relay terminal device and the network device may be because the relay terminal device has a low priority, or because the network device does not support relaying, or because the number of relay terminal devices that have already established a relay connection with the network device has reached a threshold.

[0078] In some embodiments, the relay connection establishment method may further include the following steps:

[0079] In step S210, the relay terminal device sends the connection establishment failure indication information to the remote terminal device.

[0080] In some embodiments, the relay terminal device transmits the connection establishment failure indication information to the remote terminal device, and the connection establishment failure indication information is used to notify the remote terminal device of a failure to establish a relay connection.

[0081] In the embodiment of the present application, the relay terminal device adopts a Layer 2 relay method to establish a connection with the network device, and the remote terminal device and the relay terminal device establish a connection via a side link.

[0082] Another optional processing process of the relay connection establishment method according to the embodiment of the present application, as shown in FIG. 5, includes the following steps:

[0083] In step S301, the remote terminal device transmits first information to the relay terminal device, so that the relay terminal device transmits first connection establishment request information to the network device.

[0084] In some embodiments, the first information may be an RRC message. As an example, a remote terminal device sends an RRC message to a relay terminal device, the RRC message carrying a connection establishment cause value.

[0085] In some embodiments, the first information may be indication information for triggering the establishment of an RRC connection between the relay terminal device and a network device. As an example, when a remote terminal device sends indication information to a relay terminal device, the indication information is used to indicate the establishment of an RRC connection between the relay terminal device and the network device, and the indication information can carry a connection establishment cause value, the relay terminal device sends first connection establishment request information to the network device after receiving the indication information.

[0086] In some embodiments, the connection establishment cause value (establishmentCause) may be "relay", i.e., "establishmentCause=relay", which indicates that the connection requested to be established is used to perform transmission relay. In the embodiments of the present application, the specific format and content of the connection establishment cause value are not limited.

[0087] In some embodiments, the connection establishment cause value may be transmitted by a remote terminal device to a relay terminal device. For example, the connection establishment cause value may be transmitted by a remote terminal device to an AS layer entity or a NAS layer entity of the relay terminal device. For example, the connection establishment cause value corresponds to a relaying method of the relay terminal device. For example, relaying based on Layer 2 corresponds to a connection establishment cause value of 1, and relaying based on Layer 3 corresponds to a connection establishment cause value of 2. Alternatively, the connection establishment cause value may be transmitted by the remote terminal device to a NAS layer entity of the relay terminal device, and then transmitted by the NAS layer entity to an AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value may be determined by a NAS layer entity of the relay terminal device according to a protocol, and then transmitted by the NAS layer entity to an AS layer entity of the relay terminal device.

[0088] In some embodiments, the relay connection establishment method may further include the following steps:

[0089] In step S302, the remote terminal device sends a connection establishment cause value to the intermediate terminal device.

[0090] In some embodiments, the relay connection establishment method may further include the following steps:

[0091] In step S303, the remote terminal device receives connection establishment success indication information sent from the relay terminal device.

[0092] The connection establishment success indication information is used to indicate the success of the connection between the relay terminal device and the network device.

[0093] In some embodiments, if the connection between the relay terminal device and the network device is successful, the relay connection establishment method may further include the following steps:

[0094] In step S304, the remote terminal device transmits third information to the relay terminal device, and the third information is transmitted to the network device via the relay terminal device.

[0095] In some embodiments, if the connection between the relay terminal device and the network device is successful, the relay connection establishment method may further include the following steps:

[0096] In step S305, the remote terminal device receives the fourth information transmitted from the relay terminal device, and the fourth information is transmitted to the relay terminal device by the network device.

[0097] In steps S304 and S305, the relay terminal device transmits the third information and / or the fourth information between the network device and the remote terminal device based on Layer 2 relay and sidelink.

[0098] In some embodiments, the relay connection establishment method may further include the following steps:

[0099] In step S306, the remote terminal device receives the connection establishment failure indication information sent from the relay terminal device.

[0100] In some embodiments, the connection establishment failure indication information is used to indicate the cause of the connection failure between the remote terminal device and the network device.

[0101] In the embodiment of the present application, the relay terminal device adopts a Layer 2 relay method to establish a connection with the network device, and the remote terminal device and the relay terminal device establish a connection via a side link.

[0102] Another optional processing process of the relay connection establishment method according to the embodiment of the present application, as shown in FIG. 6, includes the following steps:

[0103] In step S401, the network device receives a first connection establishment request message sent from a relay terminal device, the first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request the establishment of a connection between the relay terminal device and the network device.

[0104] In some embodiments, when a relay UE needs to relay an uplink transmission for a remote UE or when a relay UE needs to relay a downlink transmission for a network device, the relay UE needs to enter an RRC connected state. As an example, the relay UE sends an RRC Setup Request message to the network device.

[0105] In some embodiments, the connection establishment cause value (establishmentCause) may be "relay", i.e., "establishmentCause=relay", which indicates that the connection requested to be established is used to perform transmission relay. In the embodiments of the present application, the specific format and content of the connection establishment cause value are not limited.

[0106] In some embodiments, the connection establishment cause value may be transmitted by a remote terminal device to a relay terminal device. For example, the connection establishment cause value may be transmitted by a remote terminal device to an AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value may be determined by an AS layer entity of the relay terminal device according to a protocol, and for example, the connection establishment cause value corresponds to a relaying method of the relay terminal device. For example, relaying based on Layer 2 corresponds to a connection establishment cause value of 1, and relaying based on Layer 3 corresponds to a connection establishment cause value of 2. Alternatively, the connection establishment cause value may be transmitted by the remote terminal device to a NAS layer entity of the relay terminal device, and then transmitted by the NAS layer entity to the AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value may be determined by a NAS layer entity of the relay terminal device according to a protocol, and then transmitted by the NAS layer entity to the AS layer entity of the relay terminal device.

[0107] In some embodiments, the relay connection establishment method may further include the following steps:

[0108] In step S402, the network device receives first information transmitted from the relay terminal device, or receives second information transmitted by the relay terminal device based on the first information.

[0109] In some embodiments, the first information is transmitted by the remote terminal equipment to the relay terminal equipment.

[0110] In some embodiments, the first information may be an RRC message. As an example, a remote terminal device sends an RRC message to a relay terminal device, the RRC message carrying a connection establishment cause value.

[0111] In some embodiments, the first information may be indication information for triggering the establishment of an RRC connection between the relay terminal device and the network device. As an example, the remote terminal device sends indication information to the relay terminal device, and if the indication information is used to indicate the establishment of an RRC connection between the relay terminal device and the network device, and the indication information can carry a connection establishment cause value, the relay terminal device sends a first connection establishment request message to the network device after receiving the indication information.

[0112] In some embodiments, the relay connection establishment method may further include the following steps:

[0113] In step S403, the network device determines whether to establish a connection between the network device and the relay terminal device based on the first connection establishment request message.

[0114] In some embodiments, the network device may determine whether to establish a connection between the network device and the relay terminal device based on a connection establishment cause value carried in the first connection establishment request message. As an example, if the connection establishment cause value is "relay" and the network device supports relaying, the network device establishes a connection between the network device and the relay terminal device. As an example, if the connection establishment cause value is "relay" and the network device does not support relaying, the network device does not establish a connection between the network device and the relay terminal device.

[0115] In some embodiments, if in step S403 the network device determines to establish a connection between the network device and a remote device, the relayed connection establishment method may further include the following steps:

[0116] In step S404, the network device transmits connection establishment success indication information to the relay terminal device.

[0117] In some embodiments, the connection establishment success indication information is used to indicate a successful connection between the relay terminal device and the network device.

[0118] In some embodiments, the relay connection establishment method may further include the following steps:

[0119] In step S405, the network device receives first indication information sent from the relay terminal device, and the first indication information is used to indicate sidelink related information between the relay terminal device and the remote terminal device.

[0120] In some embodiments, the sidelink related information between the relay terminal device and the remote terminal device comprises: The sidelink radio link failure or sidelink RRC reconfiguration failure may include at least one of the following: QoS parameters and QoS profile(s) related to NR sidelink communication; a sidelink radio link failure or sidelink RRC reconfiguration failure has been detected; the sidelink UE capability information of the associated peer UE for unicast communication; and the RLC mode information of the sidelink data radio bearer(s) received from the associated peer UE for unicast communication.

[0121] In some embodiments, the relay connection establishment method may further include the following steps:

[0122] In step S406, the network device sends first configuration information to the relay terminal device, and the first configuration information is used to transmit information between the relay terminal device and the remote terminal device.

[0123] In some embodiments, the first configuration information may be configuration information used for transmission between the relay terminal device and the remote terminal device. As an example, the first configuration information may be time-frequency resources used for transmission between the relay terminal device and the remote terminal device.

[0124] In some embodiments, if the connection between the relay terminal device and the network device is successful, the relay connection establishment method may further include the following steps:

[0125] In step S407, the network device receives first information transferred from the relay terminal device, or the network device receives second information obtained by the relay terminal device based on the first information, or the network device receives third information transmitted from the relay terminal device, and the third information is transmitted to the relay terminal device by the remote terminal device.

[0126] In some embodiments, the first information may be transmitted from the remote terminal device to the relay terminal device before performing step S401, or the first information may be transmitted by the remote terminal device to the relay terminal device after the relay terminal device and the network device establish a connection.

[0127] In some embodiments, the third information comprises an RRC message.

[0128] In some embodiments, if the connection between the relay terminal device and the network device is successful, the relay connection establishment method may further include the following steps:

[0129] In step S408, the network device transmits fourth information to the relay terminal device, and the fourth information is transmitted by the relay terminal device to the remote terminal device.

[0130] In some embodiments, the fourth information comprises an RRC message.

[0131] In steps S407 and S408, the relay terminal device transfers at least one of the first information, the second information, the third information, and the fourth information between the network device and the remote terminal device based on Layer 2 relay and sidelink.

[0132] In some embodiments, if in step S403 the network device determines to establish a connection between the network device and a remote device, the relayed connection establishment method may further include the following steps:

[0133] In step S409, the network device transmits connection establishment failure instruction information to the relay terminal device.

[0134] In some embodiments, the connection establishment failure indication information is used to indicate a cause of a connection failure between the remote terminal device and a network device. As an example, the connection establishment failure indication information may also be referred to as connection establishment rejection information.

[0135] In the embodiment of the present application, the relay terminal device adopts a Layer 2 relay method to establish a connection with the network device, and the remote terminal device and the relay terminal device establish a connection via a side link.

[0136] In the embodiment of the present application, the detailed processing process of establishing a relay connection, as shown in FIG. 7, includes the following steps:

[0137] In step S501, the remote terminal device transmits first information to the relay terminal device.

[0138] In some embodiments, the description of the first information is similar to the description of the first indication information in each of the above embodiments, and will not be repeated here.

[0139] In step S502, the relay terminal device determines an RRC connection establishment request message.

[0140] In some embodiments, the relay terminal device fills an RRC connection establishment request message with a connection establishment cause value.

[0141] In some embodiments, the connection establishment cause value may be transmitted by a remote terminal device to a relay terminal device. For example, the connection establishment cause value may be transmitted by a remote terminal device to an AS layer entity of the relay terminal device. Or, the connection establishment cause value may be determined by an AS layer entity of the relay terminal device according to a protocol. For example, the connection establishment cause value corresponds to a relaying method of the relay terminal device. For example, relaying based on Layer 2 corresponds to a connection establishment cause value of 1, and relaying based on Layer 3 corresponds to a connection establishment cause value of 2. Or, the connection establishment cause value may be transmitted by the remote terminal device to a NAS layer entity of the relay terminal device, and then transmitted by the NAS layer entity to the AS layer entity of the relay terminal device. Or, the connection establishment cause value may be determined by a NAS layer entity of the relay terminal device according to a protocol, and then transmitted by the NAS layer entity to the AS layer entity of the relay terminal device.

[0142] In step S503, the relay terminal device transmits a first connection establishment request message to the network device.

[0143] In step S504, the network device transmits connection establishment success information or connection establishment rejection information to the terminal device.

[0144] In step S505, the relay terminal device transmits connection establishment success information or connection establishment reject information to the remote terminal device.

[0145] In step S506, after receiving the connection establishment success information, the relay terminal device sends first indication information to the network device, where the first indication information is used to indicate sidelink related information between the relay terminal device and the remote terminal device.

[0146] In some embodiments, the sidelink related information between the relay terminal device and the remote terminal device comprises: The sidelink radio link failure or sidelink RRC reconfiguration failure may include at least one of the following: QoS parameters and QoS profile(s) related to NR sidelink communication; a sidelink radio link failure or sidelink RRC reconfiguration failure has been detected; the sidelink UE capability information of the associated peer UE for unicast communication; and the RLC mode information of the sidelink data radio bearer(s) received from the associated peer UE for unicast communication.

[0147] In step S507, the network device transmits the first configuration information to a relay terminal device, and the first configuration information is used to transmit information between the relay terminal device and the remote terminal device.

[0148] In some embodiments, the first configuration information may be configuration information used for transmission between the relay terminal device and the remote terminal device. As an example, the first configuration information may be time-frequency resources used for transmission between the relay terminal device and the remote terminal device.

[0149] In step S508, after receiving the connection establishment success information, the relay terminal device enters a connection state, and can perform at least one of the following information forwarding operations: the relay terminal device forwards first information to the network device for the remote terminal device; the relay terminal device sends second information to the network device based on the first information; the remote terminal device sends third information to the relay terminal device, and the relay terminal device sends the third information to the network device; the network device sends fourth information to the relay terminal device, and the relay terminal device forwards the fourth information to the remote terminal device.

[0150] The above embodiments of the present application clarify a process for establishing a connection from a remote terminal device to a network device based on Layer 2 relaying, where the remote terminal device and the relay terminal device establish a connection based on a sidelink, and the relay terminal device and the network device establish a connection based on Layer 2 relaying. The embodiments of the present application also clarify a method for acquiring a connection establishment cause value carried in a connection establishment request message sent from the relay terminal device to the network device. For example, the connection establishment cause value is sent by the remote terminal device to an access stratum entity of the relay terminal device, or the connection establishment cause value is determined by the access stratum entity of the relay terminal device according to a protocol, or the connection establishment cause value is sent by the remote terminal device to a non-access stratum entity of the relay terminal device and then transmitted by the non-access stratum entity to the access stratum entity of the relay terminal device, or the connection establishment cause value is determined by the non-access stratum entity of the relay terminal device according to a protocol and then transmitted by the non-access stratum entity to the access stratum entity of the relay terminal device.

[0151] In order to realize the relay connection establishment method provided by the embodiment of the present application, the embodiment of the present application further provides a relay terminal device, and the optional configuration structure of the relay terminal device 600 is as shown in FIG. 8: a first sending unit 601 configured to send a first connection establishment request message to a network device; The first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request the establishment of a connection between the relay terminal device and the network device.

[0152] In some embodiments, the relay terminal equipment 600 includes: It further comprises a first receiving unit 602 configured to receive first information transmitted from a remote terminal device.

[0153] In some embodiments, the first information comprises an RRC message or instruction information that triggers the establishment of an RRC connection between the relay terminal device and the network device.

[0154] In some embodiments, the connection establishment cause value is transmitted by the remote terminal to an access stratum entity of the relay terminal; Or, the connection establishment cause value is determined by an access layer entity of the relay terminal device according to a protocol; or the connection establishment cause value is transmitted by the remote terminal device to a non-access stratum entity of the relay terminal device, and then transmitted by the non-access stratum entity to an access stratum entity of the relay terminal device; Alternatively, the connection establishment cause value is determined by a non-access stratum entity of the relay terminal equipment according to a protocol, and then sent by the non-access stratum entity to an access stratum entity of the relay terminal equipment.

[0155] In some embodiments, a prose layer entity or a PC5-RRC layer entity of the relay terminal device sends a notification message to the non-access layer entity, and the notification message is used to notify the non-access layer entity of the establishment of a non-access layer connection.

[0156] In some embodiments, the connection establishment cause value corresponds to a relaying method of the relay terminal equipment.

[0157] In some embodiments, the relay terminal equipment 600 includes: The second receiving unit 603 is configured to receive a connection establishment success indication sent from the network device.

[0158] In some embodiments, the first sending unit 601 is further configured to send the connection establishment success indication information to the remote terminal device.

[0159] In some embodiments, the connection establishment success indication information is used to indicate a successful connection between the relay terminal device and the network device.

[0160] In some embodiments, the first transmitting unit 601 is further configured to transmit first indication information to the network device, the first indication information being used to indicate sidelink related information between the relay terminal device and the remote terminal device.

[0161] In some embodiments, the second receiving unit 603 is further configured to receive first configuration information sent from the network device, and the first configuration information is used to transmit information between the relay terminal device and the remote terminal device.

[0162] In some embodiments, the first sending unit 601 further sends the first information to the network device; Alternatively, the relay terminal device transmits second information to the network device based on the first information.

[0163] In some embodiments, the second information comprises an RRC message.

[0164] In some embodiments, the first receiving unit 602 is configured to receive third information transmitted from the remote terminal device, and the relay terminal device transmits the third information to the network device; And / or, the first receiving unit 602 is configured to receive fourth information transmitted from the network device, and the relay terminal transmits the fourth information to the remote terminal device.

[0165] In some embodiments, the third information comprises an RRC message and / or the fourth information comprises an RRC message.

[0166] In some embodiments, the first receiving unit 602 is further configured to receive connection establishment failure indication information sent from the network device.

[0167] In some embodiments, the first sending unit 601 is further configured to send the connection establishment failure indication information to the remote terminal device.

[0168] In some embodiments, the connection establishment failure indication information is used to indicate the cause of the connection failure between the relay terminal device and the network device.

[0169] In some embodiments, the relay terminal device establishes a connection with the network device using a Layer 2 relay method, and / or the remote terminal device and the relay terminal device establish a connection via a sidelink.

[0170] To realize the relay connection establishment method provided by the embodiment of the present application, the embodiment of the present application further provides a remote terminal device, and the optional configuration structure of the remote terminal device 800 is as shown in FIG. 9: The network device includes a second sending unit 801 configured to send first information to the relay terminal device, so that the relay terminal device sends first connection establishment request information to the network device.

[0171] In some embodiments, the second sending unit 801 is further configured to send a connection establishment cause value to the relay terminal device.

[0172] In some embodiments, the connection establishment cause value is transmitted by the remote terminal equipment to a non-access stratum entity of the relay terminal equipment; Alternatively, the connection establishment cause value is transmitted by the remote terminal equipment to an access stratum entity of the terminal equipment.

[0173] In some embodiments, the remote terminal device 800 further comprises a fourth receiving unit 802 configured to receive a connection establishment success indication sent from the relay terminal device.

[0174] In some embodiments, the connection establishment success indication information is used to indicate a successful connection between the relay terminal device and the network device.

[0175] In some embodiments, the second transmitting unit is configured to transmit third information to the relay terminal device, and the third information is transmitted to the network device via the relay terminal device.

[0176] In some embodiments, the fourth receiving unit 802 is further configured to receive fourth information transmitted from the relay terminal equipment, and the fourth information is transmitted to the relay terminal equipment by the network equipment.

[0177] In some embodiments, the remote terminal device 800 includes: The fifth receiving unit 803 is configured to receive connection establishment failure indication information sent from the relay terminal device.

[0178] In some embodiments, the connection establishment failure indication information is used to indicate the cause of the connection failure between the remote terminal device and the network device.

[0179] In some embodiments, the connection establishment cause value corresponds to a relaying method of the relay terminal equipment.

[0180] In some embodiments, the first information comprises an RRC message or instruction information that triggers the establishment of an RRC connection between the relay terminal device and the network device.

[0181] In some embodiments, the relay terminal device establishes a connection with the network device using a Layer 2 relay method, and / or the remote terminal device and the relay terminal device establish a connection via a sidelink.

[0182] To realize the relay connection establishment method provided by the embodiment of the present application, the embodiment of the present application further provides a remote terminal device, and the optional configuration structure of the network device 900 is as shown in FIG. 10 : and a sixth receiving unit 901 configured to receive a first connection establishment request message sent from a relay terminal device, the first connection establishment request message carrying a connection establishment cause value, the first connection establishment request message being used to request the establishment of a connection between the relay terminal device and the network device.

[0183] In some embodiments, the connection establishment cause value is transmitted by a remote terminal device to an access stratum entity of the relay terminal device; Or, the connection establishment cause value is determined by an access layer entity of the relay terminal device according to a protocol; or the connection establishment cause value is transmitted by the remote terminal device to a non-access stratum entity of the relay terminal device, and then transmitted by the non-access stratum entity to an access stratum entity of the relay terminal device; Alternatively, the connection establishment cause value is determined by a non-access stratum entity of the relay terminal equipment according to a protocol, and then sent by the non-access stratum entity to an access stratum entity of the relay terminal equipment.

[0184] In some embodiments, the network device 900 comprises: The network device further comprises a processing unit 902 configured to determine whether to establish a connection between the network device and the relay terminal device based on the first connection establishment request message.

[0185] In some embodiments, the network device 900 comprises: The apparatus further includes a third sending unit 903 configured to send a connection establishment success indication information to the relay terminal device.

[0186] In some embodiments, the connection establishment success indication information is used to indicate a successful connection between the relay terminal device and the network device.

[0187] In some embodiments, the sixth receiving unit 901 is further configured to receive first indication information transmitted from the relay terminal device, the first indication information being used to indicate sidelink related information between the relay terminal device and the remote terminal device.

[0188] In some embodiments, the network device 900 comprises: The system further includes a fourth transmitting unit 904 configured to transmit first configuration information to the relay terminal device, the first configuration information being used to transmit information between the relay terminal device and the remote terminal device.

[0189] In some embodiments, the sixth receiving unit 901 further receives first information transmitted from the relay terminal device; Alternatively, the relay terminal device is configured to receive second information transmitted based on the first information, Here, the first information is transmitted by the remote terminal device to the relay terminal device.

[0190] In some embodiments, the second information comprises an RRC message.

[0191] In some embodiments, the sixth receiving unit is further configured to receive third information transmitted from the relay terminal equipment, the third information being transmitted by the remote terminal equipment to the relay terminal equipment; The third transmitting unit is further configured to transmit fourth information to the relay terminal equipment, and the fourth information is transmitted by the relay terminal equipment to the remote terminal equipment.

[0192] In some embodiments, the third information comprises an RRC message and / or the fourth information comprises an RRC message.

[0193] In some embodiments, the network device 900 comprises: It further comprises a fifth sending unit 905, configured to send connection establishment failure indication information to the relay terminal device.

[0194] In some embodiments, the connection establishment failure indication information is used to indicate the cause of the connection failure between the remote terminal device and the network device.

[0195] In some embodiments, the connection establishment cause value corresponds to a relaying method of the relay terminal equipment.

[0196] In some embodiments, the relay terminal device establishes a connection with the network device using a Layer 2 relay method, and / or the remote terminal device and the relay terminal device establish a connection via a sidelink.

[0197] An embodiment of the present application further provides a relay terminal device, the relay terminal device comprising a processor and a memory for storing a computer program executable by the processor, the processor performing steps of the relay connection establishment method executed by the above-mentioned relay terminal device when the computer program is executed.

[0198] An embodiment of the present application further provides a remote terminal device, the remote terminal device comprising: a processor; and a memory for storing a computer program executable by the processor, the processor performing steps of the relay connection establishment method executed by the remote terminal device when the computer program is executed.

[0199] An embodiment of the present application further provides a network device, the network device comprising: a processor; and a memory for storing a computer program executable by the processor, the processor performing steps of the relay connection establishment method executed by the network device when the computer program is executed.

[0200] An embodiment of the present application further provides a chip, the chip having a processor, and the processor calls and executes a computer program from a memory, thereby causing a relay terminal device equipped with the chip to perform the relay connection establishment method performed by the above-mentioned transmitting device.

[0201] An embodiment of the present application further provides a chip, the chip including a processor, which calls and executes a computer program from a memory, thereby causing a remote terminal device equipped with the chip to perform the relay connection establishment method performed by the receiving device described above.

[0202] An embodiment of the present application further provides a chip, the chip including a processor, which calls and executes a computer program from a memory, thereby causing a remote terminal device equipped with the chip to perform the relay connection establishment method performed by the above-mentioned network device.

[0203] An embodiment of the present application further provides a storage medium, in which an executable program is stored, and when the executable program is executed by a processor, the relay connection establishment method executed by the above-mentioned relay terminal device is realized.

[0204] An embodiment of the present application further provides a storage medium, in which an executable program is stored, and when the executable program is executed by a processor, the above-mentioned remote terminal device implements the relay connection establishment method.

[0205] An embodiment of the present application further provides a storage medium, the storage medium storing an executable program, and when the executable program is executed by a processor, realizing the relay connection establishment method performed by the above-mentioned network device.

[0206] An embodiment of the present application further provides a computer program product, the computer program product including computer program instructions, which cause a computer to execute the relay connection establishment method executed by the relay terminal device described above.

[0207] An embodiment of the present application further provides a computer program product, the computer program product including computer program instructions, which cause a computer to execute the relay connection establishment method executed by the above remote terminal equipment.

[0208] An embodiment of the present application further provides a computer program product, the computer program product including computer program instructions, which cause a computer to execute the relay connection establishment method executed by the above network device.

[0209] An embodiment of the present application further provides a computer program, which causes a computer to execute the relay connection establishment method executed by the relay terminal device described above.

[0210] An embodiment of the present application further provides a computer program, which causes a computer to execute the relay connection establishment method executed by the above remote terminal device.

[0211] An embodiment of the present application further provides a computer program, which causes a computer to execute the relay connection establishment method executed by the above network device.

[0212] FIG. 11 is a schematic diagram showing the hardware configuration of an electronic device (relay terminal device, remote terminal device, or network device) according to an embodiment of the present application. The electronic device 700 includes at least one processor 701, a memory 702, and at least one network interface 704. The components in the electronic device 700 are coupled together via a bus system 705. The bus system 705 is used to realize communication between these components. In addition to a data bus, the bus system 705 further includes a power bus, a control bus, and a status signal bus. However, for clarity, various buses are represented as the bus system 705 in FIG. 11.

[0213] Memory 702 may be volatile or nonvolatile, or may include both volatile and nonvolatile memory. Nonvolatile memory may be ROM, programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), ferromagnetic random access memory (FRAM), flash memory, magnetic memory, compact disk, or compact disc read-only memory (CD-ROM), and magnetic memory may be magnetic disk memory or magnetic tape memory. Volatile memory may be random access memory (RAM) used as an external cache.By way of illustrative, but not limiting example, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), SyncLink dynamic random access memory (SLDRAM), direct memory bus random access memory (DRRAM), etc. Memory 702 as described in embodiments herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0214] The memory 702 in the present embodiment is configured to store various types of data to support operation by the electronic device 700. Examples of this data include any computer program used to operate on the electronic device 700, such as an application program 7022. Programs for implementing methods in accordance with the present embodiment may be included in the application program 7022.

[0215] The above-described methods disclosed in the embodiments of the present application may be applied to or realized by the processor 701. The processor 701 may be an integrated circuit chip with signal processing functions. In the implementation process, each step of the above-described method embodiments may be completed by an integrated logic circuit in the form of hardware in the processor 701 or instructions in the form of software. The processor 701 may be a general-purpose processor, a digital signal processor (DSP) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc. The processor 701 may implement or execute each method, step, and logic block diagram disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application may be directly executed by a hardware decoding processor or by a combination of hardware and software modules in the decoding processor. The software modules may be located in a storage medium, which may be located in the memory 702. The processor 701 reads information stored in the memory 702 and completes the above-described method steps in combination with the hardware.

[0216] In an exemplary embodiment, electronic device 700 can be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, Programmable Logic Devices (PLDs), Complex Programmable Logic Devices (CPLDs), FPGAs, general-purpose processors, controllers, MCUs, MPUs, or other electronic elements to perform the methods described above.

[0217] The present application is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. Each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, whereby the instructions, when executed by the processor of the computer or other programmable data processing device, produce an apparatus for implementing the functionality specified in one or more processes in the flowcharts and / or one or more blocks in the block diagrams.

[0218] These computer program instructions may further be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to operate in a particular manner, thereby producing an article of manufacture that includes an instruction apparatus with the instructions stored in the computer-readable memory, the instruction apparatus implementing the functions specified in one or more processes of the flowcharts and / or one or more blocks of the block diagrams.

[0219] These computer program instructions may also be loaded into a computer or other programmable data processing device, which causes the computer or other programmable data processing device to perform a series of operational steps to generate a computer-implemented process, whereby the instructions executed on the computer or other programmable data processing device provide steps for implementing the functions specified in one or more processes of the flowcharts and / or one or more blocks of the block diagrams.

[0220] It should be noted that the terms "system" and "network" are always used interchangeably in this specification. The term "and / or" in this specification describes only an associated relationship and indicates that three relationships can exist. For example, A and / or B can indicate three cases: A exists independently, A and B both exist, and B exists independently. In addition, the symbol " / " in this specification usually indicates that the relationship between associated objects is an "or" relationship.

[0221] The above are merely preferred embodiments of the present disclosure and are not intended to limit the scope of protection of the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure should all be included in the scope of protection of the present disclosure.

Claims

1. A relay connection establishment method, comprising: The relay terminal device transmits a first connection establishment request message to the network device; the first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device; The relay connection establishment method includes: The method further includes receiving, by a relay terminal device, first information transmitted from a remote terminal device, the first information being indication information, the indication information being used to indicate establishment of an RRC connection between the relay terminal device and the network device; A method for establishing a relayed connection, wherein the connection establishment cause value is sent by the remote terminal directly to an access stratum entity of the relay terminal.

2. The relay connection establishment method includes: the relay terminal device receives connection establishment success indication information transmitted from the network device; The method of claim 1 .

3. The relay connection establishment method includes: The method further includes the relay terminal device sending first indication information to the network device, the first indication information being used to indicate sidelink related information between the relay terminal device and the remote terminal device. The method of claim 2 .

4. The side link related information includes: The information includes at least one of QoS parameters and a QoS file for NR sidelink communication, detection of a sidelink radio link failure or a sidelink RRC reconfiguration failure, capability information of a sidelink terminal device for a peer-to-peer terminal device in unicast communication, and radio link control mode information for receiving a sidelink data radio bearer of a peer-to-peer terminal device in unicast communication. The method for establishing a relay connection according to claim 3.

5. The relay connection establishment method includes: The method further includes receiving first configuration information transmitted by the relay terminal device from the network device, the first configuration information being used to transmit information between the relay terminal device and the remote terminal device. The relay connection establishment method according to any one of claims 2 to 4.

6. The relay connection establishment method includes: The relay terminal device may further transmit second information to the network device based on the first information. The relay connection establishment method according to any one of claims 1 to 5.

7. The relay connection establishment method includes: receiving, by the relay terminal device, connection establishment failure indication information transmitted from the network device; The method of claim 1 .

8. The relay connection establishment method includes: the relay terminal device further includes transmitting the connection establishment failure indication information to the remote terminal device. The method of claim 7, wherein the relay connection is established.

9. the relay terminal device establishes a connection with the network device by adopting a Layer 2 relay method; and / or the remote terminal device and the relay terminal device establish a connection via a side link; The method for establishing a relay connection according to any one of claims 1 to 8.

10. A relay connection establishment method, comprising:

1. A method for establishing a relay connection, comprising: a remote terminal device transmitting first information to a relay terminal device, such that the relay terminal device transmits connection establishment request information to a network device; the first connection establishment request message carries a connection establishment cause value; the first connection establishment request message is used to request establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device; the first information is indication information, the indication information is used to indicate establishment of an RRC connection between the relay terminal device and the network device; and the connection establishment cause value is transmitted by the remote terminal device directly to an access stratum entity of the relay terminal device.

11. A relay connection establishment method, comprising:

1. A method for establishing a relay connection, comprising: a network device receiving a first connection establishment request message sent from a relay terminal device, the first connection establishment request message carrying a connection establishment cause value, the first connection establishment request message being used to request establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device, the connection establishment cause value being sent directly by a remote terminal device to an access stratum entity of the relay terminal device, and the RRC connection being established based on indication information sent by the relay terminal device from the remote terminal device.

12. A relay terminal device, a first sending unit configured to send a first connection establishment request message to the network device; the first connection establishment request message carries a connection establishment cause value, the first connection establishment request message is used to request establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device, the connection establishment cause value being sent directly by a remote terminal device to an access stratum entity of the relay terminal device; The relay terminal device includes: The relay terminal device further comprises a first receiving unit configured to receive first information transmitted from a remote terminal device, the first information being indication information used to indicate establishment of an RRC connection between the relay terminal device and the network device.

13. A network device, a sixth receiving unit configured to receive a first connection establishment request message sent from a relay terminal device, the first connection establishment request message carrying a connection establishment cause value, the first connection establishment request message being used to request establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device, the connection establishment cause value being sent directly by a remote terminal device to an access stratum entity of the relay terminal device, and the RRC connection being established based on indication information sent by the relay terminal device from the remote terminal device.

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