Relay connection establishment method, electronic device, and storage medium

Abstract

The application discloses a relay connection establishment method, comprising the following steps: a relay terminal device sends a first connection establishment request message to a network device; a connection establishment reason value is carried in the first connection establishment request message, and the first connection establishment request message is used for requesting to establish a connection between the relay terminal device and the network device. The application also discloses another relay connection establishment method, an electronic device and a storage medium.

Description

[0001] This application is a divisional application of PCT International Patent Application No. PCT / CN2021 / 085459, filed on April 2, 2021, entitled “Relay Connection Establishment Method, Electronic Device and Storage Medium” and entering the Chinese national phase as Chinese Patent Application No. 202180083074.4. TECHNICAL FIELD

[0002] The present application relates to the technical field of sidelink transmission, and in particular to a relay connection establishment method, an electronic device and a storage medium. BACKGROUND

[0003] In a new radio-vehicle to everything (NR-V2X) system, a connection establishment procedure of a terminal device to a network device based on layer 2 relay has not been specified. SUMMARY

[0004] Embodiments of the present application provide a relay connection establishment method, an electronic device and a storage medium, which specify a connection establishment procedure of a terminal device to a network device based on layer 2 relay.

[0005] In a first aspect, embodiments of the present application provide a relay connection establishment method, comprising: a relay terminal device sending a first connection establishment request message to a network device.

[0006] The first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request to establish a connection between the relay terminal device and the network device.

[0007] In a second aspect, embodiments of the present application provide a relay connection establishment method, comprising: a remote terminal device sending first information to a relay terminal device; and causing the relay terminal device to send a first connection establishment request message to a network device.

[0008] In a third aspect, embodiments of the present application provide a relay connection establishment method, comprising: a network device receiving a first connection establishment request message sent by a relay terminal device, the first connection establishment request message carrying a connection establishment cause value, and the first connection establishment request message being used to request to establish a connection between the relay terminal device and the network device.

[0009] In a fourth aspect, embodiments of the present application provide a relay terminal device, comprising:

[0010] A first sending unit, configured to send a first connection establishment request message to a network device.

[0011] The first connection establishment request message carries a connection establishment reason value, and is used to request establishment of a connection between the relay terminal device and the network device.

[0012] In a fifth aspect, an embodiment of the present application provides a remote terminal device, which comprises:

[0013] A second sending unit is configured to send first information to a relay terminal device, so that the relay terminal device sends first connection establishment request information to a network device.

[0014] In a sixth aspect, an embodiment of the present application provides a network device, which comprises:

[0015] A sixth receiving unit is configured to receive first connection establishment request information sent by a relay terminal device, wherein the first connection establishment request information carries a connection establishment reason value, and is used to request establishment of a connection between the relay terminal device and the network device.

[0016] In a seventh aspect, an embodiment of the present application provides a relay terminal device, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein when the processor runs the computer program, the steps of the relay connection establishment method performed by the relay terminal device are executed.

[0017] In an eighth aspect, an embodiment of the present application provides a remote terminal device, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein when the processor runs the computer program, the steps of the relay connection establishment method performed by the remote terminal device are executed.

[0018] In a ninth aspect, an embodiment of the present application provides a network device, which comprises a processor and a memory for storing a computer program capable of running on the processor, wherein when the processor runs the computer program, the steps of the relay connection establishment method performed by the network device are executed.

[0019] In a tenth aspect, an embodiment of the present application provides a chip, which comprises a processor, configured to call and run a computer program from a memory, so that a relay terminal device installed with the chip executes the relay connection establishment method performed by the sending device.

[0020] In an eleventh aspect, an embodiment of the present application provides a chip, which comprises a processor, configured to call and run a computer program from a memory, so that a remote terminal device installed with the chip executes the relay connection establishment method performed by the receiving device.

[0021] In a twelfth aspect, an embodiment of the present application provides a chip, comprising: a processor configured to invoke and run a computer program from a memory, so that a network device in which the chip is installed performs the relay connection establishment method performed by the receiving device.

[0022] In a thirteenth aspect, an embodiment of the present application provides a storage medium storing an executable program, which, when executed by a processor, implements the relay connection establishment method performed by the relay terminal device.

[0023] In a fourteenth aspect, an embodiment of the present application provides a storage medium storing an executable program, which, when executed by a processor, implements the relay connection establishment method performed by the remote terminal device.

[0024] In a fifteenth aspect, an embodiment of the present application provides a storage medium storing an executable program, which, when executed by a processor, implements the relay connection establishment method performed by the network device.

[0025] In a sixteenth aspect, an embodiment of the present application provides a computer program product comprising computer program instructions, which cause a computer to perform the relay connection establishment method performed by the remote terminal device.

[0026] In a seventeenth aspect, an embodiment of the present application provides a computer program product comprising computer program instructions, which cause a computer to perform the relay connection establishment method performed by the relay terminal device.

[0027] In an eighteenth aspect, an embodiment of the present application provides a computer program product comprising computer program instructions, which cause a computer to perform the relay connection establishment method performed by the network device.

[0028] In a nineteenth aspect, an embodiment of the present application provides a computer program, which causes a computer to perform the relay connection establishment method performed by the relay terminal device.

[0029] In a twentieth aspect, an embodiment of the present application provides a computer program, which causes a computer to perform the relay connection establishment method performed by the remote terminal device.

[0030] In a twenty-first aspect, an embodiment of the present application provides a computer program, which causes a computer to perform the relay connection establishment method performed by the network device. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 Flowchart of the process of selecting transmission resources in the first mode of the present application;

[0032] Figure 2Flowchart of the process of selecting transmission resource in the second mode of the present application;

[0033] Figure 3 Flowchart of the process of establishing connection of relay network in the embodiment of the present application;

[0034] Figure 4 Flowchart of an optional process of the method of establishing relay connection provided in the embodiment of the present application;

[0035] Figure 5 Flowchart of another optional process of the method of establishing relay connection provided in the embodiment of the present application;

[0036] Figure 6 Flowchart of still another optional process of the method of establishing relay connection provided in the embodiment of the present application;

[0037] Figure 7 Flowchart of a detailed process of establishing relay connection provided in the embodiment of the present application;

[0038] Figure 8 Flowchart of an optional component structure of the relay terminal device provided in the embodiment of the present application;

[0039] Figure 9 Flowchart of an optional component structure of the remote terminal device provided in the embodiment of the present application;

[0040] Figure 10 Flowchart of an optional component structure of the network device provided in the embodiment of the present application;

[0041] Figure 11 Flowchart of the hardware component structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to be able to understand the features and technical contents of the embodiments of the present application more thoroughly, the implementation of the embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present application.

[0043] Before the embodiments of the present application are described, the related contents will be briefly described.

[0044] Device to Device (D2D) communication is a sidelink (SL) based transmission technology, which is different from the way of receiving or sending communication data through network equipment in the traditional cellular system, so it has higher spectrum efficiency and lower transmission delay, and the vehicle-to-everything system adopts the D2D communication mode (i.e. the device-to-device direct communication mode). In the New Radio (NR) system, for D2D communication, the Third Generation Partnership Project (3GPP) defines two transmission modes: the first mode (also referred to as mode A) and the second mode (also referred to as mode B). The first mode is that the network equipment allocates transmission resources for the terminal equipment, and the second mode is that the terminal equipment selects transmission resources autonomously.

[0045] For the first mode: as shown in Figure 1 , the transmission resource of the terminal equipment is allocated by the network equipment, and the terminal equipment sends data on the sidelink according to the resource allocated by the network equipment; the network equipment can allocate single transmission resources for the terminal equipment, or semi-static transmission resources for the terminal equipment.

[0046] For the second mode: as shown in Figure 2 , the terminal equipment selects a transmission resource in the resource pool to send data.

[0047] The terminal equipment can use the first mode to obtain transmission resources, or use the second mode to obtain transmission resources, or use both the first mode and the second mode to obtain transmission resources. Among them, the acquisition of transmission resources can be indicated by the way of sidelink authorization, as an example, the sidelink authorization indicates the time-frequency location of the corresponding Pysical Sidelink Control Channel (PSCCH) resource and Physical Sidelink Shared CHannel (PSSCH) resource.

[0048] In NR V2X, the terminal equipment can autonomously initiate Hybrid Automatic Repeat reQuest (HARQ) retransmission; as an example, feedback-based HARQ retransmission can be introduced in the unicast communication and groupcast communication of NR V2X.

[0049] In 3GPP Release (Rel) 12 / 13, for proximity based service (ProSe), a resource pool can be configured to indicate the location in time domain, for example, the resource pool is discontinuous in time domain, so that the terminal device discontinuously transmits and / or receives data on sidelink, thereby achieving the effect of power saving.

[0050] In R14 / 15, the vehicle-to-everything system has requirements for the scenario of vehicle-to-vehicle communication, which mainly faces the scenario of vehicle-to-vehicle and vehicle-to-person communication with relatively high speed.

[0051] In the V2X system, since the vehicle-mounted system has continuous power supply, the delay of data transmission is the main problem to be solved, so the terminal device is required to continuously transmit and receive in the system design.

[0052] In R14, the scenario of wearable device (FeD2D) accessing the network through a mobile phone is studied, especially for the scenario of low moving speed and low power access. For FeD2D, the network device can configure the DRX parameter of the remote terminal through a relay terminal.

[0053] The connection establishment process of the terminal device is briefly described below.

[0054] Before initiating a call, the terminal device first needs to perform access control. From the perspective of the performer, the access control can be divided into two types, the first type is performed by the terminal device itself, which is collectively referred to as unified access control (UAC) in the NR system, and the second type is performed by the network device according to the "RRC establishment cause" in the radio resource control (RRC) setup request (SetupRequest) message. The key of the second type of access control lies in that the non-access stratum (NAS) layer of the terminal device will obtain an "RRC establishment cause" according to the access identifier and the access category mapping when initiating a call. The "RRC establishment cause" is encoded by the RRC layer in the RRC SetupRequest message and sent to the network device. How the network device performs access control according to the "RRC establishment cause" is the internal algorithm of the network device, which is implemented by the network device. If the network device accepts the RRCSetupRequest message initiated by the terminal device, the network device will send an RRCSetup message in response, otherwise it will send an RRCReject (RRC rejection) message to reject.

[0055] The terminal device-to-network (UE-to-network) relay function based on layer 3 relay is introduced in R13, that is, a remote terminal device accesses a network through a relay terminal device. The relay terminal device undertakes the function of Internet Protocol (IP) layer relay and transmits data between the remote terminal device and the network device. The remote terminal device and the relay terminal device are connected through a sidelink. The connection establishment process of the relay network can be as shown in Figure 3 In step 5, the relay terminal device reports the identity (ID) of the remote terminal device and IP information to the network device. The network device learns the association relationship between the relay terminal device and the remote terminal device according to the report message, and then performs corresponding bearer / session management and configuration, so that the remote terminal device is connected to the network through the relay terminal device.

[0056] For the UE-to-network relay function based on layer 2 relay, that is, a remote terminal device accesses a network through a relay terminal device. The relay terminal device undertakes the function of adaptation layer relay and transmits data between the remote terminal device and the network device. The remote terminal device and the relay terminal device are connected through a sidelink. The adaptation layer is located above the Radio Link Control (RLC) layer and below the Packet Data Convergence Protocol (PDCP) layer. However, the connection establishment process of the UE-to-network based on layer 2 relay has not been clearly defined in the related art.

[0057] It should be understood that, in various embodiments of the present application, the size of the serial 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 inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0058] The embodiments of the present application provide a relay connection establishment method, which clearly defines the connection establishment process based on layer 2.

[0059] An optional processing flow of the relay connection establishment method provided by the embodiments of the present application is shown in Figure 4 The method comprises the following steps:

[0060] In step S201, a relay terminal device sends a first connection establishment request message to a network device. The first connection establishment request message carries a connection establishment reason value, and the first connection establishment request message is used to request to establish a connection between the relay terminal device and the network device.

[0061] In some embodiments, if the relay UE needs to relay the uplink transmission of the remote UE, or the relay UE needs to relay the downlink transmission of the network device, the relay UE needs to enter the RRC connected state; for example, the relay UE sends an RRCSetupRequest message to the network device.

[0062] In some embodiments, the connection establishment cause value (establishmentCause) can be "relay", i.e., establishmentCause = relay, indicating that the connection to be established is used for relaying transmission. In the embodiments of the present application, the specific form and content of the connection establishment cause value are not limited.

[0063] In some embodiments, the connection establishment cause value can be sent by the remote terminal device to the relay terminal device; for example, the connection establishment cause value can be sent by the remote terminal device to the AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value is determined by the AS layer entity of the relay terminal device according to the protocol; for example, the connection establishment cause value corresponds to the relay mode of the relay terminal device; for example, connection establishment cause value 1 corresponds to layer 2-based relay, and connection establishment cause value 2 corresponds to layer 3-based relay. Alternatively, the connection establishment cause value is sent by the remote terminal device to the NAS layer entity of the relay terminal device, and then sent by the NAS layer entity to the AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value is determined by the NAS layer entity of the relay terminal device according to the protocol, and then sent by the NAS layer entity to the AS layer entity of the relay terminal device.

[0064] In some embodiments, the method can further include:

[0065] Step S202, the relay terminal device receives the first information sent by the remote terminal device.

[0066] In some embodiments, the first information can be an RRC message; for example, the remote terminal device sends an RRC message to the relay terminal device, and the RRC message can carry the connection establishment cause value.

[0067] In some embodiments, the first information can be indication information triggering the relay terminal device to establish an RRC connection with the network device, and the indication information triggering the relay terminal device to establish an RRC connection with the network device can carry a connection establishment cause value. As an example, the remote terminal device sends indication information to the relay terminal device, and the indication information is used to instruct the relay terminal device to establish an RRC connection with the network device; then the relay terminal device receives the indication information and sends a first connection establishment request message to the network device. In this scenario, the relay terminal device needs to fill in the connection establishment cause value in the first connection establishment request message.

[0068] In some embodiments, the method can further include:

[0069] In step S203, a remote (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 instruct the non-access layer entity to establish a non-access layer connection.

[0070] In some embodiments, the NAS layer entity of the relay terminal device delivers the establishmentCause value to the AS layer entity of the relay terminal device and triggers 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 in an RRC connection establishment request message.

[0071] In some embodiments, the method can further include:

[0072] In step S204, the relay terminal device receives connection establishment success indication information sent by the network device.

[0073] In some embodiments, the connection establishment success indication information is used to indicate that the relay terminal device is successfully connected with the network device.

[0074] In some embodiments, the method can further include:

[0075] In step S205, the relay terminal device sends the connection establishment success indication information to the remote terminal device.

[0076] In some embodiments, if the relay terminal device is successfully connected with the network device, the method can further include:

[0077] In step S206, the relay terminal device sends first indication information to the network device, and the first indication information is used to indicate sidelink related information between the relay terminal device and the remote terminal device.

[0078] In some embodiments, the sidelink related information between the relay terminal device and the remote terminal device can comprise at least one of the following:

[0079] 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.

[0080] In some embodiments, the method can further comprise:

[0081] Step S207, the relay terminal device receives the first configuration information sent by the network device, and the first configuration information is used for the relay terminal device and the remote terminal device to transmit information.

[0082] In some embodiments, the first configuration information can be configuration information used for the relay terminal device and the remote terminal device to transmit; as an example, the first configuration information can be time-frequency resources used by the relay terminal device and the remote terminal device to transmit.

[0083] In some embodiments, if the connection between the relay terminal device and the network device is successfully established, the method can further comprise:

[0084] Step S208, the relay terminal device forwards at least one of the first information, the second information, the third information and the fourth information to the network device;

[0085] In some embodiments, the relay terminal device receives the first information sent by the remote terminal device, and forwards the first information to the network device.

[0086] In some embodiments, the relay terminal device sends second information to the network device, the second information being mapped from the first information by an adaption layer of the relay terminal.

[0087] In some embodiments, the relay terminal device receives the third information sent by the remote terminal device, and forwards the third information to the network device.

[0088] In some embodiments, the relay terminal receives the fourth information sent by the network device, and forwards the fourth information to the remote terminal device.

[0089] In some embodiments, the third information and the fourth information can both be RRC messages.

[0090] In some embodiments, 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.

[0091] In some embodiments, the method can further include:

[0092] Step S209: The relay terminal device receives connection establishment failure indication information sent by the network device.

[0093] In some embodiments, the connection establishment failure indication information is used to indicate the reason for the connection failure between the relay terminal device and the network device. As an example, the connection establishment failure indication information can also be referred to as connection establishment rejection information.

[0094] In some embodiments, the reason for the connection failure between the relay terminal device and the network device can be that the priority of the relay terminal device is low, or the network device does not support relay, or the number of relay terminal devices that have established relay connections with the network device reaches a threshold, etc.

[0095] In some embodiments, the method can further include:

[0096] Step S210: The relay terminal device sends the connection establishment failure indication information to the remote terminal device.

[0097] In some embodiments, the relay terminal device sends the connection establishment failure indication information to the remote terminal device, to inform the remote terminal device that the relay connection establishment has failed.

[0098] In the embodiments of the present application, the relay terminal device establishes a connection with the network device in a layer 2 relay manner; and the remote terminal device establishes a connection with the relay terminal device through a sidelink.

[0099] Another optional processing procedure of the relay connection establishment method provided by the embodiments of the present application is shown in Figure 5

[0100] In step S301, the remote terminal device sends first information to the relay terminal device, so that the relay terminal device sends first connection establishment request information to the network device.

[0101] In some embodiments, the first information can be an RRC message. As an example, the remote terminal device sends an RRC message to the relay terminal device, and the RRC message carries a connection establishment cause value.

[0102] In some embodiments, the first information can be indication information for triggering the relay terminal device to establish an RRC connection with the network device. As an example, the remote terminal device sends indication information to the relay terminal device, and the indication information is used to instruct the relay terminal device to establish an RRC connection with the network device, and the indication information can carry a connection establishment cause value; and after receiving the indication information, the relay terminal device sends first connection establishment request information to the network device.

[0103] In some embodiments, the connection establishment cause value (establishmentCause) can be "relay", that is, "establishmentCause = ralay", indicating that the connection to be established is used for performing transmission relay. In the embodiments of the present application, the specific form and content of the connection establishment cause value are not limited.

[0104] In some embodiments, the connection establishment cause value can be sent by the remote terminal device to the relay terminal device; as an example, the connection establishment cause value can be sent by the remote terminal device to an AS layer entity or a NAS layer entity of the relay terminal device. As an example, the connection establishment cause value corresponds to a relay mode of the relay terminal device; for example, a layer 2-based relay corresponds to a connection establishment cause value 1, and a layer 3-based relay corresponds to a connection establishment cause value 2. Alternatively, the connection establishment cause value is sent by the remote terminal device to the NAS layer entity of the relay terminal device, and then sent by the NAS layer entity to the AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value is determined by the NAS layer entity of the relay terminal device according to a protocol, and then sent by the NAS layer entity to the AS layer entity of the relay terminal device.

[0105] ​In some embodiments, the method can further include:

[0106] In step S302, the remote terminal device sends a connection establishment cause value to the relay terminal device.

[0107] In some embodiments, the method can further include:

[0108] In step S303, the remote terminal device receives the connection establishment success indication information sent by the relay terminal device.

[0109] The connection establishment success indication information is used to indicate that the relay terminal device is successfully connected to the network device.

[0110] In some embodiments, if the relay terminal device is successfully connected to the network device, the method can further include:

[0111] In step S304, the remote terminal device sends third information to the relay terminal device, and the third information is sent to the network device through the relay terminal device.

[0112] In some embodiments, if the relay terminal device is successfully connected to the network device, the method can further include:

[0113] In step S305, the remote terminal device receives fourth information sent by the relay terminal device, and the fourth information is sent to the relay terminal device by the network device.

[0114] In steps S304 to 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.

[0115] In some embodiments, the method can further include:

[0116] In step S306, the remote terminal device receives connection establishment failure indication information sent by the relay terminal device.

[0117] In some embodiments, the connection establishment failure indication information is used to indicate the reason for the connection failure between the remote terminal device and the network device.

[0118] In the embodiments of the present application, the relay terminal device establishes a connection with the network device in a layer 2 relay manner, and the remote terminal device establishes a connection with the relay terminal device through sidelink.

[0119] Another optional processing flow of the relay connection establishment method provided by the embodiments of the present application is shown in Figure 6 The method includes the following steps:

[0120] Step S401, the network device receives a first connection establishment request message sent by a relay terminal device, wherein 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 connection between the relay terminal device and the network device.

[0121] In some embodiments, if the relay terminal device needs to relay uplink transmission of a remote terminal device or needs to relay downlink transmission of a network device, the relay terminal device needs to enter an RRC connected state; for example, the relay terminal device sends an RRCSetupRequest message to the network device.

[0122] In some embodiments, the connection establishment cause value (establishmentCause) can be "relay", i.e., establishmentCause = relay, indicating that the connection to be established is used to perform transmission relay. In the embodiments of the present application, the specific form and content of the connection establishment cause value are not limited.

[0123] In some embodiments, the connection establishment cause value can be sent by a remote terminal device to a relay terminal device; for example, the connection establishment cause value can be sent by the remote terminal device to an AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value is 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 relay mode of the relay terminal device; for example, layer 2-based relay corresponds to connection establishment cause value 1, and layer 3-based relay corresponds to connection establishment cause value 2. Alternatively, the connection establishment cause value is sent by the remote terminal device to a NAS layer entity of the relay terminal device, and then sent by the NAS layer entity to an AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value is determined by a NAS layer entity of the relay terminal device according to a protocol, and then sent by the NAS layer entity to an AS layer entity of the relay terminal device.

[0124] In some embodiments, the method can further include:

[0125] Step S402, the network device receives first information sent by the relay terminal device; or the network device receives second information sent by the relay terminal device based on the first information.

[0126] In some embodiments, the first information is sent by the remote terminal device to the relay terminal device.

[0127] In some embodiments, the first information can be an RRC message. As an example, the remote terminal device sends an RRC message to the relay terminal device, and the RRC message carries a connection establishment cause value.

[0128] In some embodiments, the first information can be indication information triggering the relay terminal device to establish an RRC connection with the network device. As an example, the remote terminal device sends indication information to the relay terminal device, and the indication information is used to instruct the relay terminal device to establish an RRC connection with the network device, and the indication information can carry a connection establishment cause value; then the relay terminal device receives the indication information and sends a first connection establishment request message to the network device.

[0129] In some embodiments, the method can further include:

[0130] 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.

[0131] In some embodiments, the network device can determine whether to establish a connection between the network device and the relay terminal device according to 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 relay, 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 relay, the network device does not establish a connection between the network device and the relay terminal device.

[0132] In some embodiments, if the network device determines to establish a connection between the network device and the remote terminal device in step S403, the method can further include:

[0133] Step S404: The network device sends connection establishment success indication information to the relay terminal device.

[0134] In some embodiments, the connection establishment success indication information is used to indicate that the relay terminal device is successfully connected to the network device.

[0135] In some embodiments, the method can further include:

[0136] Step S405: The network device receives first indication information sent by 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.

[0137] In some embodiments, the sidelink related information between the relay terminal device and the remote terminal device can comprise at least one of the following:

[0138] 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.

[0139] In some embodiments, the method can further comprise:

[0140] At step S406, the network device sends first configuration information to the relay terminal device, the first configuration information being used for the relay terminal device and the remote terminal device to transmit information.

[0141] In some embodiments, the first configuration information can be configuration information used for the relay terminal device and the remote terminal device to transmit; as an example, the first configuration information can be time-frequency resources used by the relay terminal device and the remote terminal device to transmit.

[0142] In some embodiments, if the relay terminal device is successfully connected with the network device, the method can further comprise:

[0143] Step S407. The network device receives the first information forwarded by 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 sent by the relay terminal device, the third information being sent by the remote terminal device to the relay terminal device.

[0144] In some embodiments, the first information can be sent by the remote terminal device to the relay terminal device before step S401 is performed; the first information can also be sent by the remote terminal device to the relay terminal device after the relay terminal device establishes a connection with the network device.

[0145] In some embodiments, the third information includes an RRC message.

[0146] In some embodiments, if the relay terminal device successfully connects with the network device, the method can further include:

[0147] Step S408. The network device sends fourth information to the relay terminal device, the fourth information being sent to the remote terminal device via the relay terminal device.

[0148] In some embodiments, the fourth information includes an RRC message.

[0149] In steps S407 and S408, the relay terminal device transmits 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.

[0150] In some embodiments, if the network device determines to establish a connection between the network device and the remote terminal device in step S403, the method can further include:

[0151] Step S409. The network device sends connection establishment failure indication information to the relay terminal device.

[0152] In some embodiments, the connection establishment failure indication information is used to indicate the reason for the connection failure between the remote terminal device and the network device. As an example, the connection establishment failure indication information can be referred to as the connection establishment rejection information.

[0153] In the embodiments of the present application, the relay terminal device establishes a connection with the network device in a layer 2 relay manner; and the remote terminal device establishes a connection with the relay terminal device through sidelink.

[0154] In the embodiments of the present application, the detailed process flow of the relay connection establishment is as shown in Figure 7 ​

[0155] Step S501, the remote terminal device sends first information to the relay terminal device.

[0156] In some embodiments, the description of the first information is the same as the description of the first indication information in the above embodiments, which is not repeated here.

[0157] Step S502, the relay terminal device determines an RRC connection establishment request message.

[0158] In some embodiments, the relay terminal device fills a connection establishment cause value in the RRC connection establishment request message.

[0159] In some embodiments, the connection establishment cause value can be sent by the remote terminal device to the AS layer entity of the relay terminal device; as an example, the connection establishment cause value can be sent by the remote terminal device to the AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value is determined by the AS layer entity of the relay terminal device according to a protocol; as an example, the connection establishment cause value corresponds to the relay mode of the relay terminal device; for example, connection establishment cause value 1 corresponds to layer 2-based relay, and connection establishment cause value 2 corresponds to layer 3-based relay. Alternatively, the connection establishment cause value is sent by the remote terminal device to the NAS layer entity of the relay terminal device, and then sent by the NAS layer entity to the AS layer entity of the relay terminal device. Alternatively, the connection establishment cause value is determined by the NAS layer entity of the relay terminal device according to a protocol, and then sent by the NAS layer entity to the AS layer entity of the relay terminal device.

[0160] Step S503, the relay terminal device sends the first connection establishment request message to the network device.

[0161] Step S504, the network device sends connection establishment success information or connection establishment rejection information to the terminal device.

[0162] Step S505, the relay terminal device sends the connection establishment success information or the connection establishment rejection information to the remote terminal device.

[0163] Step S506, after receiving the connection establishment success information, the relay terminal device sends 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.

[0164] In some embodiments, the sidelink related information between the relay terminal device and the remote terminal device can include at least one of the following:

[0165] 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.

[0166] At step S507, the network device receives the first configuration information from the relay terminal device, and the first configuration information is used for the relay terminal device and the remote terminal device to transmit information.

[0167] In some embodiments, the first configuration information can be configuration information used for the relay terminal device and the remote terminal device to transmit; for example, the first configuration information can be time-frequency resources used by the relay terminal device and the remote terminal device to transmit.

[0168] At step S508, after the relay terminal device receives the connection establishment success information, the relay terminal device enters a connected state. The relay terminal device 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; and 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.

[0169] The above embodiments of the present application explicitly describe a connection establishment procedure of a remote terminal device to a network device based on layer 2 relay; the remote terminal device establishes a connection with a relay terminal device based on sidelink, and the relay terminal device establishes a connection with the network device based on layer 2 relay. The present application also explicitly describes an acquisition manner of a connection establishment cause value carried in a connection establishment request message sent by the relay terminal device to the network device. As an example, the connection establishment cause value is sent by the remote terminal device to an access layer entity of the relay terminal device; or, the connection establishment cause value is determined by the access layer 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 layer entity of the relay terminal device, and then sent by the non-access layer entity to the access layer entity of the relay terminal device; or, the connection establishment cause value is determined by the non-access layer entity of the relay terminal device according to a protocol, and then sent by the non-access layer entity to the access layer entity of the relay terminal device.

[0170] To implement the relay connection establishment method provided in the embodiments of the present application, the embodiments of the present application further provide a relay terminal device. An optional component structure of the relay terminal device 600 is shown in FIG. 6, which includes: Figure 8

[0171] A first sending unit 601, configured to send a first connection establishment request message to a network device.

[0172] The first connection establishment request message carries a connection establishment cause value, and the first connection establishment request message is used to request to establish a connection between the relay terminal device and the network device.

[0173] In some embodiments, the relay terminal device 600 further includes:

[0174] A first receiving unit 602, configured to receive first information sent by a remote terminal device.

[0175] In some embodiments, the first information includes an RRC message, or indication information triggering the relay terminal device to establish an RRC connection with the network device.

[0176] In some embodiments, the connection establishment cause value is sent by the remote terminal device to an access layer entity of the relay terminal device.

[0177] Or, the connection establishment cause value is determined by the access layer entity of the relay terminal device according to a protocol.

[0178] Or, the connection establishment cause value is sent by the remote terminal device to a non-access layer entity of the relay terminal device, and then sent by the non-access layer entity to the access layer entity of the relay terminal device.​

[0179] Alternatively, the connection establishment cause value is determined by a non-access stratum entity of the relay terminal device according to a protocol, and is sent by the non-access stratum entity to an access stratum entity of the relay terminal device.

[0180] In some embodiments, a remote stratum entity or a PC5-RRC stratum entity of the relay terminal device sends a notification message to the non-access stratum entity, and the notification message is used to notify the non-access stratum entity to establish a non-access stratum connection.

[0181] In some embodiments, the connection establishment cause value corresponds to a relay mode of the relay terminal device.

[0182] In some embodiments, the relay terminal device 600 further includes:

[0183] The second receiving unit 603 is configured to receive the connection establishment success indication information sent by the network device.

[0184] In some embodiments, the first sending unit 601 is further configured to send the connection establishment success indication information to the remote terminal device.

[0185] In some embodiments, the connection establishment success indication information is used to indicate that the relay terminal device is successfully connected to the network device.

[0186] In some embodiments, the first sending unit 601 is further configured to send first indication information to the network device, and the first indication information is used to indicate sidelink related information between the relay terminal device and the remote terminal device.

[0187] In some embodiments, the second receiving unit 603 is further configured to receive first configuration information sent by the network device, and the first configuration information is used for the relay terminal device and the remote terminal device to transmit information.

[0188] In some embodiments, the first sending unit 601 is further configured to send the first information to the network device.

[0189] Alternatively, the relay terminal device sends second information to the network device based on the first information.

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

[0191] In some embodiments, the first receiving unit 602 is configured to receive third information sent by the remote terminal device, and the relay terminal device sends the third information to the network device.

[0192] And / or, the first receiving unit 602 is configured to receive fourth information sent by the network device, and the relay terminal sends the fourth information to the remote terminal device.

[0193] In some embodiments, the third information comprises: an RRC message; and / or, the fourth information comprises: an RRC message.

[0194] In some embodiments, the first receiving unit 602 is further configured to receive connection establishment failure indication information sent by the network device.

[0195] In some embodiments, the first sending unit 601 is further configured to send the connection establishment failure indication information to the remote terminal device.

[0196] In some embodiments, the connection establishment failure indication information is used to indicate the reason for the connection failure between the relay terminal device and the network device.

[0197] In some embodiments, the relay terminal device establishes a connection with the network device in a layer 2 relay manner; and / or, the remote terminal device establishes a connection with the relay terminal device through a sidelink.

[0198] To implement the relay connection establishment method provided by the embodiments of the present application, the embodiments of the present application further provide a remote terminal device. An optional component structure of the remote terminal device 800 is shown in Figure 9 , and the remote terminal device 800 comprises:

[0199] A second sending unit 801 is configured to send first information to a relay terminal device, so that the relay terminal device sends first connection establishment request information to a network device.

[0200] In some embodiments, the second sending unit 801 is further configured to send a connection establishment reason value to the relay terminal device.

[0201] In some embodiments, the connection establishment reason value can be sent by the remote terminal device to a non-access layer entity of the relay terminal device.

[0202] Or, the connection establishment reason value can be sent by the remote terminal device to an access layer entity of the terminal device.

[0203] In some embodiments, the remote terminal device 800 further comprises a fourth receiving unit 802 configured to receive connection establishment success indication information sent by the relay terminal device.

[0204] In some embodiments, the connection establishment success indication information is used to indicate that the relay terminal device has successfully connected to the network device.

[0205] In some embodiments, the second sending unit is configured to send third information to the relay terminal device, and the third information is sent to the network device through the relay terminal device.

[0206] In some embodiments, the fourth receiving unit 802 is further configured to receive fourth information sent by the relay terminal device, and the fourth information is sent to the relay terminal device by the network device.

[0207] In some embodiments, the remote terminal device 800 further includes:

[0208] The fifth receiving unit 803 is configured to receive connection establishment failure indication information sent by the relay terminal device.

[0209] In some embodiments, the connection establishment failure indication information is used to indicate a reason for connection failure between the remote terminal device and the network device.

[0210] In some embodiments, the connection establishment reason value corresponds to a relay mode of the relay terminal device.

[0211] In some embodiments, the first information includes an RRC message, or indication information for triggering the relay terminal device to establish an RRC connection with the network device.

[0212] In some embodiments, the relay terminal device establishes a connection with the network device in a layer 2 relay mode, and / or the remote terminal device establishes a connection with the relay terminal device through sidelink.

[0213] To implement the relay connection establishment method provided in the embodiments of the present application, the embodiments of the present application further provide a remote terminal device. An optional component structure of the network device 900 is shown in FIG. 8, which includes: Figure 10

[0214] The sixth receiving unit 901 is configured to receive a first connection establishment request message sent by a relay terminal device, and the first connection establishment request message carries a connection establishment reason value. The first connection establishment request message is used to request to establish a connection between the relay terminal device and the network device.

[0215] In some embodiments, the connection establishment reason value is sent to an access layer entity of the relay terminal device by a remote terminal device.

[0216] Alternatively, the connection establishment reason value is determined by an access layer entity of the relay terminal device according to a protocol.

[0217] ​Alternatively, the connection establishment cause value is sent by the remote terminal device to a non-access layer entity of the relay terminal device, and then sent by the non-access layer entity to an access layer entity of the relay terminal device.

[0218] Alternatively, the connection establishment cause value is determined by a non-access layer entity of the relay terminal device according to a protocol, and then sent by the non-access layer entity to an access layer entity of the relay terminal device.

[0219] In some embodiments, the network device 900 further includes:

[0220] The processing unit 902 is configured to determine whether to establish the connection between the network device and the relay terminal device based on the first connection establishment request message.

[0221] In some embodiments, the network device 900 further includes:

[0222] The third sending unit 903 is configured to send connection establishment success indication information to the relay terminal device.

[0223] In some embodiments, the connection establishment success indication information is used to indicate that the relay terminal device is successfully connected with the network device.

[0224] In some embodiments, the sixth receiving unit 901 is further configured to receive first indication information sent by 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.

[0225] In some embodiments, the network device 900 further includes:

[0226] The fourth sending unit 904 is configured to send first configuration information to the relay terminal device, and the first configuration information is used for the relay terminal device to transmit information with the remote terminal device.

[0227] In some embodiments, the sixth receiving unit 901 is further configured to receive first information sent by the relay terminal device;

[0228] Alternatively, second information sent by the relay terminal device based on the first information is received.

[0229] The first information is sent by the remote terminal device to the relay terminal device.

[0230] In some embodiments, the second information includes an RRC message.

[0231] In some embodiments, the sixth receiving unit is further configured to receive third information sent by the relay terminal device, wherein the third information is sent by the remote terminal device to the relay terminal device.

[0232] The third sending unit is further configured to send fourth information to the relay terminal device, wherein the fourth information is sent to the remote terminal device via the relay terminal device.

[0233] In some embodiments, the third information comprises an RRC message, and / or the fourth information comprises an RRC message.

[0234] In some embodiments, the network device 900 further comprises:

[0235] A fifth sending unit 905 configured to send connection establishment failure indication information to the relay terminal device.

[0236] In some embodiments, the connection establishment failure indication information is used to indicate a reason for connection failure between the remote terminal device and the network device.

[0237] In some embodiments, the connection establishment reason value corresponds to a relay mode of the relay terminal device.

[0238] In some embodiments, the relay terminal device establishes a connection with the network device in a layer 2 relay mode, and / or the remote terminal device establishes a connection with the relay terminal device through a sidelink.

[0239] Embodiments of the present application also provide a relay terminal device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein when the processor runs the computer program, it performs the steps of the relay connection establishment method performed by the relay terminal device.

[0240] Embodiments of the present application also provide a remote terminal device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein when the processor runs the computer program, it performs the steps of the relay connection establishment method performed by the remote terminal device.

[0241] Embodiments of the present application also provide a network device comprising a processor and a memory for storing a computer program capable of running on the processor, wherein when the processor runs the computer program, it performs the steps of the relay connection establishment method performed by the network device.

[0242] The embodiment of the present application further provides a chip, comprising: a processor, configured to call and run a computer program from a memory, so that a relay terminal device installed with the chip executes the relay connection establishment method executed by the sending device.

[0243] The embodiment of the present application further provides a chip, comprising: a processor, configured to call and run a computer program from a memory, so that a relay terminal device installed with the chip executes the relay connection establishment method executed by the sending device.

[0244] The embodiment of the present application further provides a chip, comprising: a processor, configured to call and run a computer program from a memory, so that a relay terminal device installed with the chip executes the relay connection establishment method executed by the sending device.

[0245] The embodiment of the present application further provides a storage medium, which stores an executable program, and the executable program is executed by a processor to implement the relay connection establishment method executed by the relay terminal device.

[0246] The embodiment of the present application further provides a storage medium, which stores an executable program, and the executable program is executed by a processor to implement the relay connection establishment method executed by the relay terminal device.

[0247] The embodiment of the present application further provides a storage medium, which stores an executable program, and the executable program is executed by a processor to implement the relay connection establishment method executed by the relay terminal device.

[0248] The embodiment of the present application further provides a computer program product, comprising computer program instructions, which make a computer execute the relay connection establishment method executed by the relay terminal device.

[0249] The embodiment of the present application further provides a computer program product, comprising computer program instructions, which make a computer execute the relay connection establishment method executed by the relay terminal device.

[0250] The embodiment of the present application further provides a computer program product, comprising computer program instructions, which make a computer execute the relay connection establishment method executed by the relay terminal device.

[0251] The embodiment of the present application further provides a computer program, which makes a computer execute the relay connection establishment method executed by the relay terminal device.

[0252] The embodiment of the present application further provides a computer program, which makes a computer execute the relay connection establishment method executed by the relay terminal device.

[0253] The embodiment of the present application further provides a computer program, which enables a computer to execute the relay connection establishment method executed by the network device.

[0254] Figure 11 Fig. 7 is a schematic diagram of a hardware composition structure of an electronic device (a relay terminal device, a remote terminal device or a network device) according to an embodiment of the present application. The electronic device 700 comprises at least one processor 701, a memory 702 and at least one network interface 704. The various components in the electronic device 700 are coupled together by a bus system 705. It can be understood that the bus system 705 is used to realize the connection communication between the components. The bus system 705 comprises, in addition to a data bus, a power supply bus, a control bus and a status signal bus. However, in order to make the description clear, all the buses are marked as the bus system 705 in Fig. 7. Figure 11 Fig. 7 is a schematic diagram of a hardware composition structure of an electronic device (a relay terminal device, a remote terminal device or a network device) according to an embodiment of the present application. The electronic device 700 comprises at least one processor 701, a memory 702 and at least one network interface 704. The various components in the electronic device 700 are coupled together by a bus system 705. It can be understood that the bus system 705 is used to realize the connection communication between the components. The bus system 705 comprises, in addition to a data bus, a power supply bus, a control bus and a status signal bus. However, in order to make the description clear, all the buses are marked as the bus system 705 in Fig. 7.

[0255] It is to be understood that the memory 702 can be volatile or nonvolatile memory, or both. In one embodiment, the nonvolatile memory can be ROM, programmable ROM (PROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), ferroelectric random access memory (FRAM), flash memory, a magnetic storage disk, a magnetic tape, or a compact disk (CD-ROM). The magnetic storage disk can be a magnetic hard disk or a magnetic tape. The volatile memory can be random access memory (RAM) used as an external cache. By way of example, and not limitation, 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 (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Sync Link Dynamic Random Access Memory (SLDRAM), and Direct Rambus Random Access Memory (DRRAM). The memory 702 described herein is intended to include, without being limited to, these and any other suitable types of memory.

[0256] The memory 702 in the embodiments of the present application is configured to store various types of data to support the operation of the electronic device 700. Examples of the data include any computer programs, such as the application programs 7022, for operating on the electronic device 700. The programs for implementing the method of the embodiments of the present application can be included in the application programs 7022.

[0257] The method disclosed in the embodiments of the present application can be applied to the processor 701 or implemented by the processor 701. The processor 701 can be an integrated circuit chip having a signal processing capability. In the implementation process, each step of the above method can be completed by an integrated logic circuit or an instruction in the form of software in the processor 701. The processor 701 described above can be a general-purpose processor, a digital signal processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The processor 701 can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiments of the present application, the execution can be directly embodied as a hardware coding processor, or a combination of hardware and software modules in the coding processor. The software module can be located in a storage medium, and the storage medium is located in the memory 702. The processor 701 reads the information in the memory 702 and combines the hardware to complete the steps of the above method.

[0258] In the exemplary embodiments, the 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, for executing the above method.

[0259] The present application is described with reference to flowcharts and / or block diagrams of the method, device (system) and computer program product according to the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows 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 general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device for implementing the functions described in the flowcharts and / or block diagrams.Figure 1 one or more processes and / or blocks Figure 1 an apparatus for performing the functions specified in the flowchart

[0260] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flowchart Figure 1 one or more processes and / or blocks Figure 1 an apparatus for performing the functions specified in the flowchart

[0261] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart Figure 1 one or more processes and / or blocks Figure 1 an apparatus for performing the functions specified in the flowchart

[0262] It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and / or" in this application merely describes an associated relationship between associated objects, which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects.

[0263] The above description is only a preferred embodiment of the present application, and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for establishing a relay connection, the method comprising: The relay terminal device sends a first connection establishment request message to the network device; The first connection establishment request message carries a connection establishment reason value and is used to request the establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device. The method further includes: The relay terminal device receives first information sent by the remote terminal device, wherein the first information triggers the relay terminal device to establish an RRC connection with the network device; The connection establishment reason value is sent directly from the remote terminal device to the access layer entity of the relay terminal device; The method further includes: The access layer entity of the relay terminal device directly fills the connection establishment reason value into the first connection establishment request message.

2. The method according to claim 1, wherein, The first information includes: RRC message.

3. The method according to claim 1 or 2, wherein, The method includes: The relay terminal device receives a connection establishment success indication message sent by the network device.

4. The method according to claim 3, wherein, The method further includes: The relay terminal device sends a 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.

5. The method according to claim 4, wherein, The side link related information includes at least one of the following: The QoS parameters and QoS files related to NR sidelink communication, the detected sidelink radio link failure or sidelink RRC reconfiguration failure, the capability information of the sidelink terminal equipment related to the point-to-point terminal equipment in unicast communication, and the radio link control mode information for receiving the sidelink data radio bearer of the point-to-point terminal equipment in unicast communication.

6. The method according to claim 3, wherein, The method further includes: The relay terminal device receives first configuration information sent by the network device, and the first configuration information is used for the relay terminal device to transmit information with the remote terminal device.

7. The method according to claim 1 or 2, wherein, The method further includes: The relay terminal device sends the second information to the network device based on the first information.

8. The method according to claim 1 or 2, wherein, The method includes: The relay terminal device receives a connection establishment failure indication message sent by the network device.

9. The method according to claim 8, wherein, The method further includes: The relay terminal device sends a connection establishment failure indication message to the remote terminal device.

10. The method according to claim 1 or 2, wherein, 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 through a side link.

11. A method for establishing a relay connection, the method comprising: The remote terminal device sends the first information to the relay terminal device; The relay terminal device sends a first connection establishment request message to the network device. The first connection establishment request message carries a connection establishment reason value and is used to request the establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device. The first information triggers the relay terminal device to establish an RRC connection with the network device. The connection establishment reason value is directly sent by the remote terminal device to the access layer entity of the relay terminal device. The connection establishment reason value is also directly filled into the first connection establishment request message by the access layer entity of the relay terminal device.

12. A method for establishing a relay connection, the method comprising: The network device receives a first connection establishment request message sent by the relay terminal device. The first connection establishment request message carries a connection establishment reason value and is used to request the establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device. Wherein, the connection establishment reason value is sent directly from the remote terminal device to the access layer entity of the relay terminal device; and the connection establishment reason value is directly filled into the first connection establishment request message by the access layer entity of the relay terminal device.

13. A relay terminal device, the relay terminal device comprising: The first sending unit is configured to send a first connection establishment request message to the network device; The first connection establishment request message carries a connection establishment reason value and is used to request the establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device. The relay terminal equipment further includes: The first receiving unit is configured to receive first information sent by a remote terminal device, wherein the first information triggers the relay terminal device to establish an RRC connection with the network device; Wherein, the connection establishment reason value is directly sent by the remote terminal device to the access layer entity of the relay terminal device; and the connection establishment reason value is directly filled into the first connection establishment request message by the access layer entity of the relay terminal device.

14. A network device, the network device comprising: The sixth receiving unit is configured to receive a first connection establishment request message sent by the relay terminal device. The first connection establishment request message carries a connection establishment reason value and is used to request the establishment of a Radio Resource Control (RRC) connection between the relay terminal device and the network device. Wherein, the connection establishment reason value is sent directly from the remote terminal device to the access layer entity of the relay terminal device; and the connection establishment reason value is directly filled into the first connection establishment request message by the access layer entity of the relay terminal device.

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