Information transmission method and apparatus, terminal and network device

Abstract

The present disclosure provides an information transmission method and apparatus, a terminal and a network device. The method comprises: sending a first message to a network device by means of at least one second relay terminal, wherein the first message at least carries a layer-2 identifier of a remote terminal; and receiving a second message sent by the network device, wherein the second message comprises at least one of the following: the layer-2 identifier of the remote terminal; a local identifier of the remote terminal; and an egress radio resource control channel used by a first relay terminal to forward an SRB of the remote terminal.

Description

Information transmission method and device, terminal and network device

[0001] The present disclosure claims priority to the Chinese patent application No. 202411000212.X, filed on July 24, 2024, and entitled "Information transmission method and device, terminal and network device", the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present disclosure relates to the technical field of communication, in particular to an information transmission method and device, terminal and network device. BACKGROUND

[0003] In order to expand network coverage, a relay can be considered to be introduced. The relay itself is also a terminal, that is, a terminal with a relay function. According to the different target nodes of a remote terminal accessed through a relay, the relay can have different names, such as a terminal-to-network relay (UE-to-Network Relay, U2N Relay) if the remote terminal accesses a network device through a relay. If the remote terminal cannot connect to the network through one relay, then multiple-hop relays can be introduced. In a multiple-hop U2N Relay scenario, multiple relays are needed. How to establish an end-to-end connection between a remote terminal and a network device in a multiple-hop relay scenario to ensure terminal communication reliability is a problem to be considered. SUMMARY

[0004] Embodiments of the present disclosure provide an information transmission method and device, terminal and network device to realize smooth establishment of an end-to-end connection between a remote terminal and a network device in a multiple-hop relay scenario, and ensure communication reliability between the remote terminal and the network device.

[0005] To solve the above technical problem, an information transmission method is provided in embodiments of the present disclosure, applied to a first relay terminal, comprising:

[0006] sending, by the first relay terminal, a first message to a network device through at least one second relay terminal, the first message carrying at least a layer two identifier of a remote terminal;

[0007] receiving a second message sent by the network device, the second message comprising at least one of:

[0008] the layer two identifier of the remote terminal;

[0009] a local identifier of the remote terminal;

[0010] forwarding, by the first relay terminal, an exit radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal;

[0011] The first relay terminal is connected with the remote terminal through a direct communication interface, and the remote terminal is connected with the network device through the first relay terminal and the at least one second relay terminal.

[0012] In some embodiments, the first relay terminal forwards an outgoing radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal includes at least one of:

[0013] In a transmission direction from the remote terminal to the network device, the first relay terminal forwards a direct communication interface outgoing radio resource control channel used by a SRB of the remote terminal;

[0014] In a transmission direction from the network device to the remote terminal, the first relay terminal forwards a direct communication interface outgoing radio resource control channel used by a SRB of the remote terminal.

[0015] In some embodiments, the method further comprises:

[0016] Before sending the first message, establishing an end-to-end radio resource control (RRC) connection with the network device through the at least one second relay terminal.

[0017] In some embodiments, after receiving the second message sent by the network device, the method further comprises:

[0018] If receiving information sent by the remote terminal through a first relay radio link control (RLC) channel, performing at least one of the following operations:

[0019] According to the second message, determining, in a transmission direction from the remote terminal to the network device, an outgoing radio resource control channel to be forwarded for a first type of signaling radio bearer of the remote terminal;

[0020] According to the second message, determining, in a transmission direction from the remote terminal to the network device, a layer 2 identifier or a local identifier of the remote terminal carried in a direct communication link relay adaptation protocol (SRAP) header when the first relay terminal forwards the first type of signaling radio bearer of the remote terminal;

[0021] The first relay RLC channel includes SL-RLC0 and / or SL-RLC1, and the first type of signaling radio bearer includes a signaling radio bearer (SRB) 0 numbered 0 and / or a SRB 1 numbered 1.

[0022] In some embodiments, after receiving the second message sent by the network device, the method further comprises:

[0023] In a transmission direction from the network device to the remote terminal, at least one of the following is used to forward the RRC connection setup message to the remote terminal:

[0024] forwarding using a second relay radio link control channel, the second relay radio link control channel including SL-RLC0 and / or SL-RLC1;

[0025] forwarding through a first target egress radio resource control channel, the first target egress radio resource control channel being determined according to a target identifier of the remote terminal included in an SRAP header of information received by the first relay terminal, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel used by the first relay terminal to forward SRBs of the remote terminal included in the second message, the target identifier including a layer two identifier or a local identifier.

[0026] In some embodiments, the method further comprises:

[0027] after an end-to-end RRC connection is established between the remote terminal and the network device, receiving a third message sent by the network device, the third message including at least one of the following:

[0028] a layer two identifier of the remote terminal;

[0029] a local identifier of the remote terminal;

[0030] an egress radio resource control channel used by the first relay terminal to forward SRBs and / or data radio bearers DRBs of the remote terminal.

[0031] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward SRBs and / or data radio bearers DRBs of the remote terminal includes at least one of the following:

[0032] in a transmission direction from the remote terminal to the network device, the first relay terminal forwards a direct communication interface egress radio resource control channel used by the remote terminal for SRBs and / or DRBs;

[0033] in a transmission direction from the network device to the remote terminal, the first relay terminal forwards a direct communication interface egress radio resource control channel used by the remote terminal for SRBs and / or DRBs.

[0034] Embodiments of the present disclosure also provide an information transmission method applied to a second relay terminal, including:

[0035] receiving a first message sent by a first relay terminal, the first message carrying at least a layer two identifier of a remote terminal;

[0036] sending the first message to a network device;

[0037] receiving a fourth message sent by the network device, the fourth message comprising at least one of:

[0038] a layer two identity of the remote terminal;

[0039] a local identity of the remote terminal;

[0040] forwarding, by the second relay terminal, an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal;

[0041] In some embodiments, the first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; the remote terminal is connected with the network device through the first relay terminal and the second relay terminal.

[0042] In some embodiments, the second relay terminal forwards an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal, comprising at least one of:

[0043] In a transmission direction from the remote terminal to the network device, the second relay terminal forwards an egress radio resource control channel used by the SRB of the remote terminal;

[0044] In a transmission direction from the network device to the remote terminal, the second relay terminal forwards an egress radio resource control channel used by the SRB of the remote terminal;

[0045] In some embodiments, if there exists a Uu interface between the second relay terminal and the network device, in the transmission direction from the remote terminal to the network device, the egress radio resource control channel is a Uu interface egress radio resource control channel, and in the transmission direction from the network device to the remote terminal, the egress radio resource control channel is a direct communication interface egress radio resource control channel; if there does not exist a Uu interface between the second relay terminal and the network device, the egress radio resource control channel is a direct communication interface radio resource control channel.

[0046] In some embodiments, after the receiving the fourth message sent by the network device, the method further comprises:

[0047] In a transmission direction from the remote terminal to the network device, an egress radio resource control channel for forwarding the information is determined according to a target identifier of the remote terminal contained in a SRAP header of the received information, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel for forwarding SRB of the remote terminal used by the second relay terminal in the fourth message.

[0048] The target identifier includes a layer two identifier or a local identifier.

[0049] In some embodiments, after the receiving of the fourth message sent by the network device, the method further includes:

[0050] In a transmission direction from the remote terminal to the network device, an egress radio resource control channel for forwarding the information is determined according to a target identifier of the remote terminal contained in a SRAP header of the received information, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel for forwarding SRB of the remote terminal used by the second relay terminal in the fourth message.

[0051] The target identifier includes a layer two identifier or a local identifier.

[0052] In some embodiments, the method further includes:

[0053] After an end-to-end RRC connection between the remote terminal and the network device is established, a fifth message sent by the network device is received, and the fifth message includes at least one of:

[0054] A layer two identifier of the remote terminal;

[0055] A local identifier of the remote terminal;

[0056] An egress radio resource control channel for forwarding SRB and / or data radio bearer (DRB) of the remote terminal used by the second relay terminal.

[0057] In some embodiments, the egress radio resource control channel for forwarding SRB and / or data radio bearer (DRB) of the remote terminal used by the second relay terminal includes at least one of:

[0058] In a transmission direction from the remote terminal to the network device, an egress radio resource control channel for forwarding SRB and / or DRB of the remote terminal used by the second relay terminal;

[0059] In a transmission direction from the network device to the remote terminal, an egress radio resource control channel for forwarding SRB and / or DRB of the remote terminal used by the second relay terminal;

[0060] If there is a Uu interface between the second relay terminal and the network device, the egress radio resource control channel is a Uu interface egress radio resource control channel in the transmission direction from the remote terminal to the network device, and is a direct communication interface egress radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the egress radio resource control channel is a direct communication interface radio resource control channel.

[0061] The embodiments of the present disclosure further provide an information transmission method applied to a network device, comprising:

[0062] receiving a first message sent by a first relay terminal through at least one second relay terminal, the first message carrying at least a layer two identifier of a remote terminal;

[0063] sending a second message to the first relay terminal and sending a fourth message to the at least one second relay terminal respectively;

[0064] The second message comprises at least one of:

[0065] The layer two identifier of the remote terminal;

[0066] The local identifier of the remote terminal;

[0067] The first relay terminal forwards an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal;

[0068] The fourth message comprises at least one of:

[0069] The layer two identifier of the remote terminal;

[0070] The local identifier of the remote terminal;

[0071] The second relay terminal forwards an egress radio resource control channel used by the SRB of the remote terminal;

[0072] The first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; the remote terminal is connected with the network device through the first relay terminal and the at least one second relay terminal.

[0073] In some embodiments, the first relay terminal forwards an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal comprises at least one of:

[0074] In a transmission direction from the remote terminal to the network device, the first relay terminal forwards an outgoing radio resource control channel used by the SRB of the remote terminal;

[0075] In a transmission direction from the network device to the remote terminal, the first relay terminal forwards an outgoing radio resource control channel used by the SRB of the remote terminal.

[0076] In some embodiments, the second relay terminal forwarding the outgoing radio resource control channel used by the SRB of the remote terminal comprises at least one of:

[0077] In a transmission direction from the remote terminal to the network device, the second relay terminal forwards an outgoing radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal;

[0078] In a transmission direction from the network device to the remote terminal, the second relay terminal forwards an outgoing radio resource control channel used by the SRB of the remote terminal.

[0079] If there is a Uu interface between the second relay terminal and the network device, in a transmission direction from the remote terminal to the network device, the outgoing radio resource control channel is a Uu interface outgoing radio resource control channel, and in a transmission direction from the network device to the remote terminal, the outgoing radio resource control channel is a direct communication interface outgoing radio resource control channel; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is a direct communication interface radio resource control channel.

[0080] In some embodiments, the method further comprises:

[0081] In a process of establishing an end-to-end radio resource control (RRC) connection between the first relay terminal and the network device, information of at least one second relay terminal through which the first relay terminal accesses the network device is stored.

[0082] In some embodiments, the fourth message sent to the at least one second relay terminal respectively comprises:

[0083] Each second relay terminal is determined according to the at least one second relay terminal through which the first relay terminal accesses the network device.

[0084] The fourth message is sent to each determined second relay terminal respectively.

[0085] In some embodiments, the method further comprises:

[0086] If the RRC connection setup complete message sent by the remote terminal is received, at least one of the following operations is performed:

[0087] sending a third message to the first relay terminal;

[0088] sending a fifth message to the at least one second relay terminal respectively;

[0089] sending a sixth message to the remote terminal;

[0090] The third message includes at least one of the following:

[0091] a layer two identifier of the remote terminal;

[0092] a local identifier of the remote terminal;

[0093] The first relay terminal forwards an egress radio resource control channel used by SRB and / or data radio bearer DRB of the remote terminal;

[0094] The fifth message includes at least one of the following:

[0095] a layer two identifier of the remote terminal;

[0096] a local identifier of the remote terminal;

[0097] The second relay terminal forwards an egress radio resource control channel used by SRB and / or DRB of the remote terminal;

[0098] The sixth message includes at least one of the following:

[0099] a layer two identifier of the remote terminal;

[0100] a local identifier of the remote terminal;

[0101] In the transmission direction of the remote terminal to the network device, the remote terminal sends an egress radio resource control channel used by SRB and / or DRB.

[0102] In some embodiments, the first relay terminal forwards an egress radio resource control channel used by SRB and / or data radio bearer DRB of the remote terminal includes at least one of the following:

[0103] In the transmission direction of the remote terminal to the network device, the first relay terminal forwards a direct communication interface egress radio resource control channel used by SRB and / or DRB of the remote terminal;

[0104] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards an exit radio resource control channel used by the SRB and / or DRB of the remote terminal.

[0105] In some embodiments, the exit radio resource control channel forwarded by the second relay terminal for the SRB and / or DRB of the remote terminal comprises at least one of:

[0106] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards an exit radio resource control channel used by the SRB and / or DRB of the remote terminal;

[0107] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards an exit radio resource control channel used by the SRB and / or DRB of the remote terminal;

[0108] If there is a Uu interface between the second relay terminal and the network device, in the transmission direction from the remote terminal to the network device, the exit radio resource control channel is a Uu interface exit radio resource control channel, and in the transmission direction from the network device to the remote terminal, the exit radio resource control channel is a direct communication interface exit radio resource control channel. If there is no Uu interface between the second relay terminal and the network device, the exit radio resource control channel is a direct communication interface radio resource control channel.

[0109] The embodiments of the present disclosure also provide an information transmission method applied to a remote terminal, comprising:

[0110] The end-to-end radio resource control (RRC) connection establishment completion message between the remote terminal and the network device is sent to the first relay terminal in at least one of the following ways:

[0111] The second type signaling radio bearer is used for sending, and the second type signaling radio bearer comprises a signaling radio bearer (SRB) 0 numbered 0 and / or a signaling radio bearer (SRB) 1 numbered 1.

[0112] The second target exit radio link control channel is sent, and the second target exit radio link control channel is determined according to indication information contained in the RRC connection establishment message received by the remote terminal from the network device, and the indication information is used to indicate an exit radio link control channel used by the remote terminal for sending the RRC connection establishment completion message.

[0113] In some embodiments, the method further comprises:

[0114] The sixth message sent by the network device is received.

[0115] wherein the sixth message comprises at least one of:

[0116] a layer two identity of the remote terminal;

[0117] a local identity of the remote terminal;

[0118] In a transmission direction from the remote terminal to the network device, the remote terminal transmits an egress radio resource control channel used by a signaling radio bearer (SRB) and / or a data radio bearer (DRB) of the remote terminal.

[0119] The embodiments of the present disclosure further provide a relay terminal, which is a first relay terminal, comprising a memory, a transceiver, and a processor.

[0120] The memory is configured to store a computer program; the transceiver is configured to transceive data under control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0121] transmit, to a network device through at least one second relay terminal, a first message carrying at least a layer two identity of a remote terminal;

[0122] receive a second message transmitted by the network device, the second message comprising at least one of:

[0123] a layer two identity of the remote terminal;

[0124] a local identity of the remote terminal;

[0125] forward, by the first relay terminal, an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal;

[0126] wherein the first relay terminal is connected to the remote terminal through a direct communication interface, and the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal.

[0127] In some embodiments, the first relay terminal forwarding an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal comprises at least one of:

[0128] In a transmission direction from the remote terminal to the network device, the first relay terminal forwards a direct communication interface egress radio resource control channel used by a SRB of the remote terminal;

[0129] In a transmission direction from the network device to the remote terminal, the first relay terminal forwards a direct communication interface egress radio resource control channel used by a SRB of the remote terminal.

[0130] In some embodiments, the processor, configured to read the computer program in the memory, is further configured to perform the following operations:

[0131] Before sending the first message, establishing an end-to-end radio resource control (RRC) connection with a network device through the at least one second relay terminal.

[0132] In some embodiments, the processor, configured to read the computer program in the memory, is further configured to perform the following operations:

[0133] If receiving information sent by the remote terminal through a first relay radio link control (RLC) channel, performing at least one of the following operations:

[0134] According to the second message, determining an egress RRC channel used by a first type of signaling radio bearer (SRB) of the remote terminal in a transmission direction from the remote terminal to the network device;

[0135] According to the second message, determining a layer 2 identifier or a local identifier of the remote terminal carried in a sidelink relay adaptation protocol (SRAP) header of the first relay terminal when forwarding the first type of SRB of the remote terminal in a direct communication link in a transmission direction from the remote terminal to the network device;

[0136] The first relay RLC channel includes SL-RLC0 and / or SL-RLC1, and the first type of SRB includes a signaling radio bearer (SRB) 0 and / or a SRB 1.

[0137] In some embodiments, the processor, configured to read the computer program in the memory, is further configured to perform the following operations:

[0138] In a transmission direction from the network device to the remote terminal, forwarding an RRC connection establishment message to the remote terminal by using at least one of the following:

[0139] Forwarding by using a second relay RLC channel, the second relay RLC channel including SL-RLC0 and / or SL-RLC1;

[0140] Forwarding by using a first target egress RRC channel, the first target egress RRC channel being determined according to a target identifier of the remote terminal included in an SRAP header of the information received by the first relay terminal, an end-to-end bearer identifier between the remote terminal and the network device, and an egress RRC channel used by the first relay terminal to forward an SRB of the remote terminal included in the second message, the target identifier including a layer 2 identifier or a local identifier.

[0141] In some embodiments, the processor, configured to read the computer program in the memory, is further configured to perform the following operations:

[0142] After the end-to-end RRC connection between the remote terminal and the network device is established, a third message sent by the network device is received, and the third message includes at least one of the following:

[0143] The Layer 2 identifier of the remote terminal;

[0144] The local identifier of the remote terminal;

[0145] The first relay terminal forwards an egress radio resource control channel used by the SRB and / or data radio bearer DRB of the remote terminal.

[0146] In some embodiments, the first relay terminal forwards an egress radio resource control channel used by the SRB and / or data radio bearer DRB of the remote terminal includes at least one of the following:

[0147] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards a direct communication interface egress radio resource control channel used by the SRB and / or DRB of the remote terminal;

[0148] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards a direct communication interface egress radio resource control channel used by the SRB and / or DRB of the remote terminal.

[0149] The embodiments of the present disclosure also provide a relay terminal, which is a second relay terminal, comprising a memory, a transceiver, and a processor:

[0150] The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0151] A first message sent by a first relay terminal is received, and the first message carries at least a Layer 2 identifier of a remote terminal;

[0152] The first message is sent to a network device;

[0153] A fourth message sent by the network device is received, and the fourth message includes at least one of the following:

[0154] The Layer 2 identifier of the remote terminal;

[0155] The local identifier of the remote terminal;

[0156] The second relay terminal forwards an egress radio resource control channel used by the signaling radio bearer SRB of the remote terminal.

[0157] The first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; and the remote terminal is connected with the network device through the first relay terminal and the second relay terminal.

[0158] In some embodiments, the second relay terminal forwards an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal, including at least one of the following:

[0159] In a transmission direction from the remote terminal to the network device, the second relay terminal forwards an egress radio resource control channel used by a SRB of the remote terminal;

[0160] In a transmission direction from the network device to the remote terminal, the second relay terminal forwards an egress radio resource control channel used by a SRB of the remote terminal;

[0161] If there is a Uu interface between the second relay terminal and the network device, in the transmission direction from the remote terminal to the network device, the egress radio resource control channel is a Uu interface egress radio resource control channel, and in the transmission direction from the network device to the remote terminal, the egress radio resource control channel is a direct communication interface egress radio resource control channel; if there is no Uu interface between the second relay terminal and the network device, the egress radio resource control channel is a direct communication interface radio resource control channel.

[0162] In some embodiments, the processor, for reading the computer program in the memory, further performs the following operations:

[0163] In the transmission direction from the remote terminal to the network device, according to a target identifier of the remote terminal contained in a SRAP header of the received information and an end-to-end bearer identifier between the remote terminal and the network device, and the egress radio resource control channel forwarded by the second relay terminal for the SRB of the remote terminal in the fourth message, the egress radio resource control channel for forwarding the information is determined.

[0164] The target identifier includes a layer two identifier or a local identifier.

[0165] In some embodiments, the processor, for reading the computer program in the memory, further performs the following operations:

[0166] determining, in a transmission direction from the network device to the remote terminal, an egress radio resource control channel for forwarding the information according to a target identifier of the remote terminal contained in an SRAP header of the received information, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel for forwarding SRB of the remote terminal used by the second relay terminal in the fourth message;

[0167] wherein the target identifier comprises a layer two identifier or a local identifier.

[0168] In some embodiments, the processor, configured to read the computer program in the memory, is further configured to perform the following operations:

[0169] receiving a fifth message sent by the network device after an end-to-end RRC connection between the remote terminal and the network device is established, the fifth message comprising at least one of:

[0170] a layer two identifier of the remote terminal;

[0171] a local identifier of the remote terminal;

[0172] an egress radio resource control channel for forwarding SRB and / or data radio bearer (DRB) of the remote terminal used by the second relay terminal.

[0173] In some embodiments, the egress radio resource control channel for forwarding SRB and / or data radio bearer (DRB) of the remote terminal used by the second relay terminal comprises at least one of:

[0174] in a transmission direction from the remote terminal to the network device, forwarding an egress radio resource control channel for SRB and / or DRB of the remote terminal used by the second relay terminal;

[0175] in a transmission direction from the network device to the remote terminal, forwarding an egress radio resource control channel for SRB and / or DRB of the remote terminal used by the second relay terminal;

[0176] wherein, if there exists a Uu interface between the second relay terminal and the network device, in the transmission direction from the remote terminal to the network device, the egress radio resource control channel is a Uu interface egress radio resource control channel, and in the transmission direction from the network device to the remote terminal, the egress radio resource control channel is a direct communication interface egress radio resource control channel; and if there does not exist a Uu interface between the second relay terminal and the network device, the egress radio resource control channel is a direct communication interface radio resource control channel.

[0177] This disclosure also provides a network device, including a memory, a transceiver, and a processor:

[0178] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0179] Receive a first message sent by a first relay terminal through at least one second relay terminal, wherein the first message carries at least a Layer 2 identifier of the remote terminal;

[0180] Send a second message to the first relay terminal and a fourth message to each of the at least one second relay terminal;

[0181] The second message includes at least one of the following:

[0182] The layer 2 identifier of the remote terminal;

[0183] The local identifier of the remote terminal;

[0184] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's signaling radio bearer (SRB).

[0185] The fourth message includes at least one of the following:

[0186] The layer 2 identifier of the remote terminal;

[0187] The local identifier of the remote terminal;

[0188] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0189] The first relay terminal is connected to the remote terminal via a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal.

[0190] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the signaling radio bearer (SRB) of the remote terminal includes at least one of the following:

[0191] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB.

[0192] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0193] In some embodiments, the second relay terminal forwards an egress radio resource control channel used by the remote terminal for SRB in the transmission direction from the remote terminal to the network device comprises at least one of:

[0194] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards an egress radio resource control channel used by the remote terminal for SRB;

[0195] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards an egress radio resource control channel used by the remote terminal for SRB;

[0196] If there is a Uu interface between the second relay terminal and the network device, in the transmission direction from the remote terminal to the network device, the egress radio resource control channel is a Uu interface egress radio resource control channel, and in the transmission direction from the network device to the remote terminal, the egress radio resource control channel is a direct communication interface egress radio resource control channel; if there is no Uu interface between the second relay terminal and the network device, the egress radio resource control channel is a direct communication interface radio resource control channel.

[0197] In some embodiments, the processor, for reading the computer program in the memory, further performs the following operations:

[0198] In the process of establishing an end-to-end radio resource control (RRC) connection between the first relay terminal and the network device, the information of at least one second relay terminal through which the first relay terminal accesses the network device is stored.

[0199] In some embodiments, the processor, for reading the computer program in the memory, further performs the following operations:

[0200] According to the at least one second relay terminal through which the first relay terminal accesses the network device, each second relay terminal is determined.

[0201] A fourth message is sent to each determined second relay terminal respectively.

[0202] In some embodiments, the processor, for reading the computer program in the memory, further performs the following operations:

[0203] If the RRC connection establishment completion message sent by the remote terminal is received, at least one of the following operations is performed:

[0204] A third message is sent to the first relay terminal;

[0205] sending a fifth message to the at least one second relay terminal respectively;

[0206] sending a sixth message to the remote terminal;

[0207] The third message includes at least one of:

[0208] The Layer 2 identifier of the remote terminal;

[0209] The local identifier of the remote terminal;

[0210] The first relay terminal forwards an egress radio resource control channel used by SRB and / or data radio bearer DRB of the remote terminal;

[0211] The fifth message includes at least one of:

[0212] The Layer 2 identifier of the remote terminal;

[0213] The local identifier of the remote terminal;

[0214] The second relay terminal forwards an egress radio resource control channel used by SRB and / or DRB of the remote terminal;

[0215] The sixth message includes at least one of:

[0216] The Layer 2 identifier of the remote terminal;

[0217] The local identifier of the remote terminal;

[0218] In the transmission direction of the remote terminal to the network device, the remote terminal sends an egress radio resource control channel used by SRB and / or DRB.

[0219] In some embodiments, the first relay terminal forwards an egress radio resource control channel used by SRB and / or data radio bearer DRB of the remote terminal includes at least one of:

[0220] In the transmission direction of the remote terminal to the network device, the first relay terminal forwards a direct communication interface egress radio resource control channel used by SRB and / or DRB of the remote terminal;

[0221] In the transmission direction of the network device to the remote terminal, the first relay terminal forwards a direct communication interface egress radio resource control channel used by SRB and / or DRB of the remote terminal.

[0222] In some embodiments, the second relay terminal forwards an egress radio resource control channel used by SRB and / or DRB of the remote terminal includes at least one of:

[0223] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards an egress radio resource control channel used by the SRB and / or DRB of the remote terminal;

[0224] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards an egress radio resource control channel used by the SRB and / or DRB of the remote terminal;

[0225] If there is a Uu interface between the second relay terminal and the network device, in the transmission direction from the remote terminal to the network device, the egress radio resource control channel is a Uu interface egress radio resource control channel, and in the transmission direction from the network device to the remote terminal, the egress radio resource control channel is a direct communication interface egress radio resource control channel; if there is no Uu interface between the second relay terminal and the network device, the egress radio resource control channel is a direct communication interface radio resource control channel.

[0226] The embodiments of the present disclosure further provide a remote terminal, comprising a memory, a transceiver, and a processor:

[0227] The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations:

[0228] The first relay terminal is sent the end-to-end radio resource control (RRC) connection establishment completion message between the remote terminal and the network device in at least one of the following manners:

[0229] Using a second type of signaling radio bearer, which includes a signaling radio bearer (SRB) 0 numbered 0 and / or a signaling radio bearer (SRB) 1 numbered 1;

[0230] Through a second target egress radio link control channel determined according to indication information contained in the RRC connection establishment message received by the remote terminal from the network device, the indication information being used to indicate the egress radio link control channel used by the remote terminal to send the RRC connection establishment completion message.

[0231] In some embodiments, the processor, configured to read the computer program in the memory, further performs the following operations:

[0232] Receiving a sixth message sent by the network device;

[0233] The sixth message includes at least one of the following:

[0234] a layer two identifier of the remote terminal;

[0235] a local identifier of the remote terminal;

[0236] In a transmission direction from the remote terminal to the network device, the remote terminal sends an outgoing radio resource control channel used by an SRB and / or a data radio bearer DRB.

[0237] The embodiments of the present disclosure further provide an information transmission apparatus applied to a first relay terminal, comprising:

[0238] a first sending unit configured to send a first message to a network device through at least one second relay terminal, the first message carrying at least a layer two identifier of a remote terminal;

[0239] a first receiving unit configured to receive a second message sent by the network device, the second message comprising at least one of:

[0240] a layer two identifier of the remote terminal;

[0241] a local identifier of the remote terminal;

[0242] the first relay terminal forwards an outgoing radio resource control channel used by a signaling radio bearer SRB of the remote terminal;

[0243] wherein the first relay terminal is connected to the remote terminal through a direct communication interface, and the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal.

[0244] The embodiments of the present disclosure further provide an information transmission apparatus applied to a second relay terminal, comprising:

[0245] a second receiving unit configured to receive a first message sent by a first relay terminal, the first message carrying at least a layer two identifier of a remote terminal;

[0246] a second sending unit configured to send the first message to a network device;

[0247] a third receiving unit configured to receive a fourth message sent by the network device, the fourth message comprising at least one of:

[0248] a layer two identifier of the remote terminal;

[0249] a local identifier of the remote terminal;

[0250] the second relay terminal forwards an outgoing radio resource control channel used by a signaling radio bearer SRB of the remote terminal;

[0251] The first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and a network device; and the remote terminal is connected with the network device through the first relay terminal and the second relay terminal.

[0252] The present disclosure further provides an information transmission apparatus applied to a network device, comprising:

[0253] The fourth receiving unit is configured to receive a first message sent by the first relay terminal through at least one second relay terminal, wherein the first message carries at least a layer-two identifier of the remote terminal.

[0254] The third sending unit is configured to send a second message to the first relay terminal and send a fourth message to the at least one second relay terminal respectively.

[0255] The second message comprises at least one of:

[0256] The layer-two identifier of the remote terminal.

[0257] The local identifier of the remote terminal.

[0258] The first relay terminal forwards an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal.

[0259] The fourth message comprises at least one of:

[0260] The layer-two identifier of the remote terminal.

[0261] The local identifier of the remote terminal.

[0262] The second relay terminal forwards an egress radio resource control channel used by a SRB of the remote terminal.

[0263] The first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and a network device; and the remote terminal is connected with the network device through the first relay terminal and the at least one second relay terminal.

[0264] The present disclosure further provides an information transmission apparatus applied to a remote terminal, comprising:

[0265] The fourth sending unit is configured to send an end-to-end radio resource control (RRC) connection setup completion message between the remote terminal and a network device to a first relay terminal in at least one of the following ways:

[0266] The first type signaling radio bearer is transmitted by using a first type signaling radio bearer, and the second type signaling radio bearer is transmitted by using a second type signaling radio bearer, wherein the second type signaling radio bearer comprises a signaling radio bearer 0 (SRB0) numbered 0 and / or a signaling radio bearer 1 (SRB1) numbered 1.

[0267] The second target egress radio link control channel is transmitted by using a second target egress radio link control channel, wherein the second target egress radio link control channel is determined according to indication information contained in an RRC connection establishment message received by the remote terminal from the network device, and the indication information is used to indicate an egress radio link control channel used by the remote terminal to transmit an RRC connection establishment completion message.

[0268] The present disclosure further provides a processor-readable storage medium, which stores a program for causing a processor to execute the method described above.

[0269] The present disclosure further provides a computer program product, which comprises computer instructions, and the computer instructions are executed by a processor to implement the steps of the method described above.

[0270] The present disclosure has the following beneficial effects:

[0271] The above scheme, after at least one second relay terminal transmits a first message to a network device, receives a second message transmitted by the network device, to obtain an egress radio resource control channel used by the first relay terminal to forward an SRB of the remote terminal, ensures that the forwarding of the SRB of the remote terminal can be successfully performed, and thus the end-to-end RRC connection of the remote terminal and the network device is successfully established, and the communication reliability of the remote terminal and the network device is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0272] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments described in the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0273] FIG. 1 shows a multi-hop U2N relay schematic diagram;

[0274] FIG. 2 shows a structure diagram of a network system suitable for the embodiments of the present disclosure;

[0275] FIG. 3 shows one of flow schematic diagrams of information transmission methods of the embodiments of the present disclosure;

[0276] FIG. 4 shows a detailed flow schematic diagram of the embodiments of the present disclosure;

[0277] FIG. 5 shows another of flow schematic diagrams of information transmission methods of the embodiments of the present disclosure;

[0278] Figure 6 shows a third flowchart of the information transmission method according to an embodiment of the present disclosure;

[0279] Figure 7 shows a fourth flowchart of the information transmission method according to an embodiment of the present disclosure;

[0280] Figure 8 shows a first unit diagram of the information transmission device according to an embodiment of the present disclosure;

[0281] Figure 9 shows a structure diagram of the relay terminal according to an embodiment of the present disclosure;

[0282] Figure 10 shows a second unit diagram of the information transmission device according to an embodiment of the present disclosure;

[0283] Figure 11 shows a third unit diagram of the information transmission device according to an embodiment of the present disclosure;

[0284] Figure 12 shows a structure diagram of the network device according to an embodiment of the present disclosure;

[0285] Figure 13 shows a fourth unit diagram of the information transmission device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0286] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present disclosure.

[0287] The terms "first", "second", and the like in the specification and claims of the present disclosure are used to distinguish similar objects, and do not necessarily indicate a specific order or a chronological sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein can be implemented in other sequences than those illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product, or device.

[0288] The term "and / or" in the embodiments of the present disclosure describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects. The term "multiple" in the embodiments of the present disclosure means two or more, and other quantifiers are similar.

[0289] In the embodiments of the present disclosure, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration, at 99 least somebody (e.g., a method or implementation option) is described as "exemplary" or "for example" is not necessarily to "preferred" or "advantageous over other embodiments or options. In fact, "exemplary" or "for example" is primarily intended to convey the

[0290] The related concepts mentioned in the present disclosure are briefly described as follows.

[0291] 1. Cellular network communication

[0292] The conventional wireless communication adopts the cellular network communication mode, that is, the terminal and the network device perform uplink and downlink data / control information transmission through the Uu interface.

[0293] 2. Direct communication

[0294] Direct communication refers to a mode in which terminals in proximity can perform data transmission within a short distance range through a direct communication link (also referred to as a Sidelink (SL) or PC5 link). The wireless interface corresponding to the Sidelink is referred to as a direct communication interface (also referred to as a Sidelink interface or PC5 interface).

[0295] 3. Relay

[0296] For U2N relay, the interface between the relay and the network uses the Uu interface, and the interface between the relay and the terminal being relayed (referred to as a remote terminal in the present disclosure) uses the Sidelink interface (also referred to as a direct communication interface or a bypass interface or a PC5 interface). The link (Uu link) between the relay and the network can be referred to as a backhaul link for the remote terminal.

[0297] After introducing the relay, the following terms can be introduced for the purpose of simplifying the description:

[0298] Direct (Direct) connection: the terminal is directly connected to the network device through the Uu interface;

[0299] Indirect (Indirect) connection: the terminal is connected to the network device through the relay device.

[0300] In the multi-hop U2N relay scenario, multiple relays are needed. As shown in FIG. 1, generally, the first relay connected with the network device (relay 3 in FIG. 1) is the U2N relay. The other relays (relay 1 and relay 2 in FIG. 1) can be referred to as U2N relay, or can be referred to as terminal-to-terminal relay (U2U relay) according to their function (forwarding data between terminals), and in addition, can be referred to as intermediate relay according to their position in the multi-hop link.

[0301] How to establish an end-to-end connection between the remote terminal and the network device in the multi-hop relay scenario to ensure the reliability of terminal communication is a problem to be considered.

[0302] Embodiments of the present disclosure are described below with reference to the accompanying drawings. The information transmission method, apparatus, terminal and network device provided by the embodiments of the present disclosure can be applied in a wireless communication system. The wireless communication system can be a system adopting the fifth generation (5th Generation, 5G) mobile communication technology (hereinafter referred to as 5G system), and the skilled in the art can understand that the 5G NR system is only an example and is not limited.

[0303] Referring to FIG. 2, FIG. 2 is a structure diagram of a network system to which embodiments of the present disclosure can be applied, as shown in FIG. 2, including a plurality of user terminals 11 and a base station 12, wherein the user terminal 11 can be a user equipment (User Equipment, UE), for example, can be a terminal side device such as a mobile phone, a tablet personal computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a personal digital assistant (personal digital assistant, PDA), a mobile Internet device (Mobile Internet Device, MID) or a wearable device (Wearable Device), and it should be noted that the specific type of user terminal 11 is not limited in the embodiments of the present disclosure. The above-mentioned base station 12 can be a 5G and later version base station (for example: gNB, 5G NR NB), or a base station in other communication systems, or a node B, and it should be noted that the 5G base station is only taken as an example in the embodiments of the present disclosure, but the specific type of base station 12 is not limited.

[0304] The embodiments of the present disclosure provide an information transmission method, apparatus, terminal and network device to realize the smooth establishment of an end-to-end connection between a remote terminal and a network device in a multi-hop relay scenario, and ensure the communication reliability between the remote terminal and the network device.

[0305] The method and apparatus are based on the same concept of the application. Since the methods and apparatus solve problems in similar ways, the implementation of the apparatus and methods can refer to each other, and the repeated parts will not be described again.

[0306] To facilitate understanding of the embodiments of this disclosure, the sending order of the first to sixth messages involved in the embodiments of this disclosure will be explained as follows.

[0307] Before an end-to-end Radio Resource Control (RRC) connection is established between the remote terminal and the network device, the first relay terminal needs to send a first message to the network device. After receiving the first message, the network device needs to send a second message to the first relay terminal and a fourth message to the second relay terminal (the second and fourth messages are not strictly ordered). Then, the end-to-end RRC connection between the remote terminal and the network device is established through information transmission. After the end-to-end RRC connection between the remote terminal and the network device is established, the network device will send a third message to the first relay terminal, a fifth message to the second relay terminal, and a sixth message to the remote terminal (the third, fifth, and sixth messages are not strictly ordered) to ensure that the end-to-end information between the remote terminal and the network device can be transmitted smoothly.

[0308] It should also be noted that there will be a first relay terminal and at least one second relay terminal between the remote terminal and the network device. That is, the remote terminal connects to the network device through the first relay terminal and at least one second relay terminal. In other words, the end-to-end RRC connection messages between the remote terminal and the network device are forwarded through the first relay terminal and at least one second relay terminal.

[0309] As shown in Figure 3, this embodiment of the present disclosure provides an information transmission method, executed by a first relay terminal, including:

[0310] Step S301: Send a first message to the network device through at least one second relay terminal, wherein the first message carries at least the Layer 2 identifier of the remote terminal;

[0311] In some embodiments, the Layer 2 identifier (ID) can be a destination Layer 2 identifier (Destination L2 ID). This destination Layer 2 identifier is specific to the first relay terminal, meaning that the remote terminal is the target communication peer of the direct communication interface of the first relay terminal.

[0312] In some embodiments, the first message may be UE Assistance Information, Sidelink UE Information, or a newly introduced Radio Resource Control (RRC) message.

[0313] Step S302: Receive a second message sent by the network device, the second message including at least one of A11-A13:

[0314] A11, the Layer 2 identifier of the remote terminal;

[0315] A12, the local identifier of the remote terminal;

[0316] It should be noted that the local identifier can be understood as the local identifier corresponding to the Layer 2 identifier assigned by the network device to the remote terminal. The local identifier occupies fewer bits than the Layer 2 identifier. Transmitting the local identifier in the Sidelink Relay Adaptation Protocol (SRAP) header will have less overhead than transmitting the Layer 2 identifier.

[0317] A13. The first relay terminal forwards the Egress Radio Resource Control (RLC) channel used by the remote terminal's Signalalling Radio Bearer (SRB); where RLC stands for Radio Link Control.

[0318] It should be noted that by instructing the first relay terminal to forward the egress radio resource control channel used by the remote terminal's SRB, the egress radio resource control channel of the remote terminal's bearer can be clearly defined. That is, the correspondence or mapping relationship between the remote terminal's bearer and the first relay terminal's egress radio resource control channel can be clarified. In other words, different SRBs correspond to different egress radio resource control channels, thereby ensuring that the first terminal can accurately forward the remote terminal's information.

[0319] In some embodiments, A11 and / or A12 are used to identify which remote terminal A13 is configured for.

[0320] It should be noted that the egress radio resource control channel can be understood as the radio resource control channel used by the first relay terminal when forwarding the SRB of the remote terminal, that is, the radio resource control channel used by the first relay terminal to send the SRB of the remote terminal to the next hop relay terminal; in some embodiments, the egress radio resource control channel can also be replaced by a radio resource control channel or a radio resource control channel egress.

[0321] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the SRB of the remote terminal includes at least one of the following:

[0322] A131. In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0323] A132. In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0324] It should be noted that, regardless of whether the transmission direction is from the remote terminal to the network device or from the network device to the remote terminal, the next-hop node of the first relay terminal is always the terminal itself. In other words, the egress radio resource control channel used by the first relay terminal to forward the remote terminal's SRB is the direct communication interface egress radio resource control channel.

[0325] It should be noted that A131 and A132 above are respectively configured as the egress radio resource control channel for the first relay terminal to forward the remote terminal's SRB in the transmission direction from the remote terminal to the network device, and the egress radio resource control channel for the first relay terminal to forward the remote terminal's SRB in the transmission direction from the network device to the remote terminal, so that the first relay terminal can accurately transmit the remote terminal's SRB in different transmission directions, ensuring the reliability of information transmission.

[0326] It should be noted that in this embodiment, the first relay terminal and the remote terminal are connected via a direct communication interface.

[0327] It should be noted that after sending the first message to the network device through at least one second relay terminal, the second message sent by the network device is received to obtain the egress radio resource control channel used by the first relay terminal to forward the remote terminal's SRB, ensuring that the remote terminal's SRB can be forwarded smoothly, thereby realizing the successful establishment of the end-to-end RRC connection between the remote terminal and the network device and ensuring the communication reliability between the remote terminal and the network device.

[0328] It should be noted that, in order to ensure smooth communication between the first relay terminal and the network device, in some embodiments, before sending the first message to the network device through at least one second relay terminal, the method further includes:

[0329] Before sending the first message, an end-to-end RRC connection is established with the network device through the at least one second relay terminal.

[0330] In some embodiments, during the process of establishing an end-to-end RRC connection between the first relay terminal and the network device, the network device needs to store information about at least one second relay terminal that the first relay terminal passes through when accessing the network device. In some embodiments, the network device may store the identifier of the second relay terminal, which may be a Layer 2 identifier.

[0331] In some embodiments, under one implementation, the network device not only needs to send a second message to the first relay terminal, but also needs to send a fourth message to at least one second relay terminal (in some embodiments, the second relay terminal is any relay terminal between the first relay terminal and the network device). In some embodiments, the fourth message includes at least one of B11-B13:

[0332] B11, the Layer 2 identifier of the remote terminal;

[0333] B12, the local identifier of the remote terminal;

[0334] B13. The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0335] It should be noted that the egress radio resource control channel can be understood as the radio resource control channel used by the second relay terminal when forwarding the SRB of the remote terminal, that is, the radio resource control channel used by the second relay terminal to send the SRB of the remote terminal to the next hop relay terminal or network device; in some embodiments, the egress radio resource control channel can also be replaced by a radio resource control channel or a radio resource control channel egress.

[0336] It should be noted that by instructing the second relay terminal to use the egress radio resource control channel for forwarding the remote terminal's SRB, the egress radio resource control channel for forwarding the remote terminal's bearer can be clearly defined. That is, the correspondence or mapping relationship between the remote terminal's bearer and the second relay terminal's egress radio resource control channel can be clarified. In other words, different SRBs correspond to different egress radio resource control channels, thereby ensuring that the second terminal can accurately forward the remote terminal's information.

[0337] In some embodiments, B11 and / or B12 described above are used to identify which remote terminal B13 is configured for.

[0338] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB, including at least one of the following:

[0339] B131. In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0340] B132. In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0341] It should be noted that if a Uu interface exists between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if no Uu interface exists between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0342] It should be noted that B131 and B132 above are respectively configured as the egress radio resource control channel for the second relay terminal to forward the remote terminal's SRB in the transmission direction from the remote terminal to the network device, and the egress radio resource control channel for the second relay terminal to forward the remote terminal's SRB in the transmission direction from the network device to the remote terminal. This enables the second relay terminal to accurately transmit the remote terminal's SRB in different transmission directions, ensuring the reliability of information transmission.

[0343] In some embodiments, the network device needs to determine each second relay terminal based on at least one second relay terminal that the first relay terminal passes through when accessing the network device; and send a fourth message to each determined second relay terminal.

[0344] In some embodiments, after receiving the second message sent by the network device, the method further includes:

[0345] If information is received from the remote terminal via the first relay wireless link control channel, perform at least one of the following operations:

[0346] C11. Based on the second message, determine the transmission direction from the remote terminal to the network device, and forward the egress radio resource control channel used by the first type of signaling radio bearer of the remote terminal;

[0347] In some embodiments, the first type of signaling radio bearer includes signaling radio bearer numbered 0 (SRB0) and / or signaling radio bearer numbered 1 (SRB1).

[0348] It should be noted that since the first relay terminal has already obtained the second message from the network device, it can know how to forward the SRB of the remote terminal based on the second message. Based on the correspondence between the SRB and the egress radio resource control channel of the first relay terminal, it can determine which egress radio resource control channel to use for information forwarding.

[0349] C12. According to the second message, in the transmission direction from the remote terminal to the network device, the first relay terminal forwards the Layer 2 identifier or local identifier of the remote terminal carried in the Direct Communication Link Relay Adaptation Layer (SRAP) header of the first type signaling radio bearer of the remote terminal.

[0350] In some embodiments, the first relay radio link control channel includes SL-RLC0 and / or SL-RLC1. It should be noted that SL-RLC0 and SL-RLC1 both refer to a radio link control channel, and SL-RLC0 and SL-RLC1 are the names of the radio link control channel.

[0351] It should be noted that, since the second message may include the Layer 2 identifier or local identifier of the remote terminal, when the first relay terminal forwards the signaling radio bearer of the remote terminal, it will carry the identifier of the remote terminal indicated by the second message in the SRAP.

[0352] In some embodiments, under one implementation, after receiving the fourth message sent by the network device, the second relay terminal further performs the following:

[0353] In the transmission direction from the remote terminal to the network device, the egress radio resource control channel for forwarding the information is determined based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, as well as the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message.

[0354] The target identifier includes a layer 2 identifier or a local identifier.

[0355] It should be noted that after the second relay terminal receives the information from the remote terminal forwarded by the first relay terminal, it needs to determine the egress radio resource control channel. By using the target identifier and bearer identifier of the remote terminal, it can determine which egress radio resource control channel to use, thereby enabling the smooth forwarding of the information from the remote terminal.

[0356] In some embodiments, under one implementation, after receiving the fourth message sent by the network device, the second relay terminal further performs the following:

[0357] In the transmission direction from the network device to the remote terminal, the egress radio resource control channel for forwarding the information is determined based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, as well as the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message.

[0358] It should be noted that this implementation method involves setting the egress radio resource control channel in the transmission direction from the network device to the remote terminal. The determination principle is the same as that in the transmission direction from the remote terminal to the network device, and will not be elaborated here.

[0359] In some embodiments, in one implementation, after receiving the second message sent by the network device, the method further includes:

[0360] In the transmission direction from the network device to the remote terminal, at least one of the following methods is used to forward the RRC connection establishment message to the remote terminal:

[0361] D11. Forward using the second relay radio link control channel, which includes SL-RLC0 and / or SL-RLC1;

[0362] It should be noted that when the first relay terminal receives the RRC connection establishment message sent by the network device, the first relay terminal can directly use SL-RLC0 and / or SL-RLC1 to forward the message. In this case, the first relay terminal does not need to determine the egress radio resource control channel based on the second message.

[0363] D12. Forwarded via the first target egress radio resource control channel, the first target egress radio resource control channel is determined based on the target identifier of the remote terminal, the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the information received by the first relay terminal, and the egress radio resource control channel used by the first relay terminal to forward the SRB of the remote terminal contained in the second message, the target identifier including a layer 2 identifier or a local identifier.

[0364] It should be noted that in this case, the egress radio resource control channel needs to be determined first based on the second message, and then the RRC connection establishment message needs to be forwarded based on the determined egress radio resource control channel.

[0365] It should be noted that, regarding the implementation of D11 and D12, the first relay terminal can choose either D11 or D12 based on the implementation, or it can adopt one of the implementation methods of D11 and D12 based on the protocol agreement or pre-configuration.

[0366] In some embodiments, under one implementation, the remote terminal sends an end-to-end RRC connection establishment completion message between the remote terminal and the network device to the first relay terminal using at least one of the following methods:

[0367] D21. Transmitted using a second type of signaling radio bearer, the second type of signaling radio bearer including SRB0 and / or SRB1;

[0368] It should be noted that when the remote terminal receives the RRC connection establishment message sent by the network device, it needs to send an RRC connection establishment completion message back to the network device. The remote terminal can directly use SRB0 and / or SRB1 to send the message. In this case, the remote terminal does not need to determine the egress radio resource control channel.

[0369] D22. Transmitted through the second target egress radio link control channel, the second target egress radio link channel being determined based on the indication information contained in the RRC connection establishment message received by the remote terminal from the network device, the indication information being used to instruct the remote terminal to use the egress radio link control channel when sending the RRC connection establishment completion message.

[0370] It should be noted that when it is necessary to send an RRC connection establishment complete message to the network device, the remote terminal needs to first determine the egress radio resource control channel based on the indication information contained in the RRC connection establishment message, and then send the RRC connection establishment complete message based on the determined egress radio resource control channel.

[0371] It should be noted that the remote relay terminal can choose between D21 and D22 based on the implementation, or it can adopt one of the implementation methods of D21 and D22 based on the protocol agreement or pre-configuration.

[0372] In some embodiments, under one implementation, the method further includes:

[0373] After the end-to-end RRC connection between the remote terminal and the network device is established, a third message is received from the network device, the third message including at least one of E11-E13:

[0374] E11, the Layer 2 identifier of the remote terminal;

[0375] E12, the local identifier of the remote terminal;

[0376] E13. The first relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or Data Radio Bearer (DRB).

[0377] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0378] E131. In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0379] E132. In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0380] It should be noted that after the end-to-end RRC connection between the remote terminal and the network device is established, configuring the egress radio resource control channel used by the first relay terminal to forward the SRB and / or DRB of the end terminal in different transmission directions can ensure smooth communication between the remote terminal and the network device after the end-to-end RRC connection is established, and ensure communication reliability.

[0381] In some embodiments, after the end-to-end RRC connection between the remote terminal and the network device is established, the network device not only needs to send a third message to the first relay terminal, but also needs to send a fifth message to at least one second relay terminal and a sixth message to the remote terminal.

[0382] In some embodiments, the fifth message includes at least one of E21-E23:

[0383] E21, the Layer 2 identifier of the remote terminal;

[0384] E22, the local identifier of the remote terminal;

[0385] E23. The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0386] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB, including at least one of the following:

[0387] E231. In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0388] E232. In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0389] It should be noted that if a Uu interface exists between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if no Uu interface exists between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0390] In some embodiments, the sixth message includes at least one of E31-E33:

[0391] E31, the Layer 2 identifier of the remote terminal;

[0392] E32, the local identifier of the remote terminal;

[0393] E33. In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or DRB.

[0394] In some embodiments, the egress radio resource control channel refers to the direct communication interface egress radio resource control channel.

[0395] The following example illustrates the specific application of this embodiment of the invention, using the example of a remote terminal connecting to a network device via a two-hop relay.

[0396] As shown in Figure 4, the detailed process of this embodiment mainly includes:

[0397] Step S41: The first relay terminal and the network device establish an end-to-end RRC connection.

[0398] It should be noted that in this step, the first relay terminal needs to establish an end-to-end RRC connection with the network device. Through the end-to-end RRC connection establishment process, the network device can obtain a list of second relay terminals used when the first relay terminal accesses the network device. The network device needs to store the list of second relay terminals used when the first relay terminal accesses the network device; in this application scenario, the list of second relay terminals includes one second relay terminal.

[0399] Step S42: The remote terminal and the first relay terminal establish a direct communication interface connection.

[0400] In this step, the remote terminal first performs a relay terminal discovery process, discovering one or more first relay terminals. Then, the remote terminal performs a relay terminal selection process, selecting one first relay terminal from the discovered first relay terminals. After the remote terminal selects a first relay terminal, it needs to establish a direct communication interface connection with the selected first relay terminal. Specifically, the direct communication interface connection refers to a PC5-S connection and / or a PC5-RRC connection.

[0401] Step S43: The remote terminal sends an RRC connection establishment request message to the first relay terminal through SL-RLC0.

[0402] In some embodiments, the RRC connection establishment request message is used to request the establishment of an end-to-end connection with the network device.

[0403] Step S44: The first relay terminal sends a first message to the network device through the second relay terminal.

[0404] In step S41, the first relay terminal has established an end-to-end RRC connection with the network device through the second relay terminal. Therefore, in step S44, the first relay terminal can send a first message to the network device through the second relay terminal. The first message carries at least the Layer 2 identifier of the remote terminal. Specifically, the first message may be UE Assistance Information, SidelinkUEInformation, or a newly introduced RRC message.

[0405] Step S45: The network device sends a second message to the first relay terminal.

[0406] Step S46: The network device sends a fourth message to the second relay terminal.

[0407] Specifically, upon receiving the first message, the network device determines each second relay terminal based on the list of second relay terminals used when the first relay terminal accesses the network device, stored in the network device's database. The network device then sends a second message and a fourth message to the first relay terminal and the second relay terminal, respectively. The second message contains at least one of the following information:

[0408] The layer 2 identifier of the remote terminal;

[0409] The local identifier of the remote terminal;

[0410] The Egress RLC channel used by the first relay terminal when forwarding the SRB (including SRB0 and / or SRB1) of the remote terminal may specifically include at least one of the following: the Egress RLC channel used by the first relay terminal when forwarding the SRB (including SRB0 and / or SRB1) of the remote terminal in the transmission direction from the remote terminal to the network device; and the Egress RLC channel used by the first relay terminal when forwarding the SRB (including SRB0 and / or SRB1) of the remote terminal in the transmission direction from the network device to the remote terminal.

[0411] The fourth message contains at least one of the following:

[0412] The layer 2 identifier of the remote terminal;

[0413] The local identifier of the remote terminal;

[0414] The Egress RLC channel used by the second relay terminal when forwarding the SRB (including SRB0 and / or SRB1) of the remote terminal may specifically include at least one of the following: the Egress RLC channel used by the second relay terminal when forwarding the SRB (including SRB0 and / or SRB1) of the remote terminal in the transmission direction from the remote terminal to the network device; and the Egress RLC channel used by the second relay terminal when forwarding the SRB (including SRB0 and / or SRB1) of the remote terminal in the transmission direction from the network device to the remote terminal.

[0415] Accordingly, the first relay terminal and the second relay terminal receive the second message and the fourth message from the network device, respectively.

[0416] Step S47: The first relay terminal sends the RRC connection establishment request message of the remote terminal to the network device.

[0417] In some embodiments, the RRC connection establishment request message is carried via SL-RLC0.

[0418] If the first relay terminal receives information from the remote terminal and the information is carried via SL-RLC0, then it performs at least one of the following operations:

[0419] According to the second message, it is determined that the remote terminal SRB0 uses the Egress RLC channel in the transmission direction from the remote terminal to the network device.

[0420] Based on the second message, determine the Layer 2 identifier or local identifier of the remote terminal carried in the SRAP header in the direction of transmission from the remote terminal to the network device.

[0421] In the transmission direction from the remote terminal to the network device, if the second relay terminal receives data from the previous hop relay terminal, it determines the Layer 2 identifier or local identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the data SRAP header, and determines the Egress RLC channel used by the combination of the Layer 2 identifier or local identifier and the bearer identifier of the remote terminal according to the second message.

[0422] Step S48: The network device sends an RRC connection establishment message to the remote terminal.

[0423] In the transmission direction from the network device to the remote terminal, when the second relay terminal forwards the data of the remote terminal, it determines the Layer 2 identifier or local identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the data SRAP header, and determines the Egress RLC channel used by the combination of the Layer 2 identifier or local identifier and the bearer identifier of the remote terminal according to the second message.

[0424] In the transmission direction from the network device to the remote terminal, when the first relay terminal forwards the RRC connection establishment message of the remote terminal to the remote terminal, it adopts one of the following operations:

[0425] Use SL-RLC0 for forwarding;

[0426] The layer 2 identifier or local identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header are determined, and the Egress RLC channel used by the combination of the layer 2 identifier or local identifier and the bearer identifier of the remote terminal is determined according to the second message.

[0427] Step S49: The remote terminal sends an RRC connection establishment complete message to the network device.

[0428] When the remote terminal sends an end-to-end RRC connection establishment completion message between the remote terminal and the network device to the first relay terminal, it may use at least one of the following methods:

[0429] Use SL-RLC1;

[0430] Based on the indication information contained in the RRC connection establishment message sent by the network device, determine the Egress RLC channel to be used. This indication information is used to instruct the remote terminal to use the egress radio link control channel when sending the RRC connection establishment completion message.

[0431] In the transmission direction from the remote terminal to the network device, if the second relay terminal receives information from the previous hop relay terminal, it determines the Layer 2 identifier or local identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the information, and determines the Egress RLC channel used by the combination of the Layer 2 identifier or local identifier of the remote terminal and the bearer identifier according to the second message.

[0432] Step S410: The network device sends a third message to the first relay terminal.

[0433] Specifically, the third message includes at least one of the following:

[0434] The layer 2 identifier of the remote terminal;

[0435] The local identifier of the remote terminal;

[0436] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB, specifically including at least one of the following: in the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB and / or DRB; in the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0437] Step S411: The network device sends a fifth message to the second relay terminal;

[0438] Specifically, the fifth message includes at least one of the following:

[0439] The layer 2 identifier of the remote terminal;

[0440] The local identifier of the remote terminal;

[0441] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB, specifically including at least one of the following: in the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB; in the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0442] Step S412: The network device sends the sixth message to the remote terminal;

[0443] Specifically, the sixth message includes at least one of the following:

[0444] The layer 2 identifier of the remote terminal;

[0445] The local identifier of the remote terminal;

[0446] In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or DRB.

[0447] In some embodiments, when a network device receives an RRC connection establishment completion message from a remote terminal, it performs RRC connection reconfiguration and executes at least one of the steps S410-S412 described above.

[0448] It should be noted that at least one embodiment of this disclosure provides a method for establishing an end-to-end connection between a remote terminal and a network device in a multi-hop U2N relay scenario. This method enables the remote terminal to establish an end-to-end connection with the network device through a multi-hop approach.

[0449] The technical solutions provided in this disclosure are applicable to a variety of systems, especially 5G systems. For example, applicable systems may include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), 5G New Radio (NR) and its evolutionary communication systems, and the 6th Generation Mobile Communication Technology (6G), etc. All of these systems include terminals (also referred to as terminal equipment) and network equipment. The system may also include a core network component, such as an evolved packet system (EPS) or a 5G system (5GS).

[0450] The terminal involved in the embodiments of this disclosure, also referred to as a terminal device, can be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connectivity, or other processing devices connected to a wireless modem. The name of the terminal device may differ in different systems; for example, in a 5G system, the terminal device may be called User Equipment (UE). The wireless terminal device can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). The wireless terminal device can be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device, for example, a portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile device, which exchanges voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but is not limited to these terms in the embodiments disclosed herein.

[0451] The network device disclosed in this embodiment may be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, the base station may also be called an access point, or a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network equipment involved in this disclosure can be a base transceiver station (BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA) system, a NodeB in a wide-band Code Division Multiple Access (WCDMA) system, an evolved Node B (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in this disclosure. In some network structures, the network equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may be geographically separated.

[0452] Network devices and terminal devices can each use one or more antennas for Multiple Input Multiple Output (MIMO) transmission. MIMO transmission can be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D MIMO, 3D MIMO, Full Dimension MIMO (FD-MIMO), or Massive MIMO, or it can be diversity transmission, pre-coded transmission, or beamforming transmission, etc.

[0453] As shown in Figure 5, this embodiment of the present disclosure provides an information transmission method, executed by a second relay terminal, including:

[0454] Step S501: Receive a first message sent by the first relay terminal, wherein the first message carries at least the Layer 2 identifier of the remote terminal;

[0455] Step S502: Send the first message to the network device;

[0456] Step S503: Receive a fourth message sent by the network device, the fourth message including at least one of the following:

[0457] The layer 2 identifier of the remote terminal;

[0458] The local identifier of the remote terminal;

[0459] The second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal.

[0460] The first relay terminal is connected to the remote terminal via a direct communication interface; the second relay terminal is any one of the relay terminals between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the second relay terminal.

[0461] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal, including at least one of the following:

[0462] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0463] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0464] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0465] In some embodiments, after receiving the fourth message sent by the network device, the method further includes:

[0466] In the transmission direction from the remote terminal to the network device, the egress radio resource control channel for forwarding the information is determined based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, as well as the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message.

[0467] The target identifier includes a layer 2 identifier or a local identifier.

[0468] In some embodiments, after receiving the fourth message sent by the network device, the method further includes:

[0469] In the transmission direction from the network device to the remote terminal, the egress radio resource control channel for forwarding the information is determined based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, as well as the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message.

[0470] The target identifier includes a layer 2 identifier or a local identifier.

[0471] In some embodiments, the method further includes:

[0472] After the end-to-end RRC connection between the remote terminal and the network device is established, a fifth message is received from the network device, the fifth message including at least one of the following:

[0473] The layer 2 identifier of the remote terminal;

[0474] The local identifier of the remote terminal;

[0475] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0476] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or data radio bearer DRB, including at least one of the following:

[0477] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0478] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0479] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0480] It should be noted that all the implementation methods in the above embodiments are applicable to the embodiments of the information transmission method applied to the second relay terminal side, and can achieve the same technical effect, so they will not be described again here.

[0481] As shown in Figure 6, this embodiment of the present disclosure provides an information transmission method, executed by a network device, including:

[0482] Step S601: Receive a first message sent by the first relay terminal through at least one second relay terminal, wherein the first message carries at least the Layer 2 identifier of the remote terminal.

[0483] Step S602: Send a second message to the first relay terminal and a fourth message to each of the at least one second relay terminal;

[0484] The second message includes at least one of the following:

[0485] The layer 2 identifier of the remote terminal;

[0486] The local identifier of the remote terminal;

[0487] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's signaling radio bearer (SRB).

[0488] The fourth message includes at least one of the following:

[0489] The layer 2 identifier of the remote terminal;

[0490] The local identifier of the remote terminal;

[0491] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0492] The first relay terminal is connected to the remote terminal via a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal.

[0493] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the signaling radio bearer (SRB) of the remote terminal includes at least one of the following:

[0494] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB.

[0495] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0496] In some embodiments, the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal includes at least one of the following:

[0497] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal.

[0498] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0499] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0500] In some embodiments, the method further includes:

[0501] During the process of establishing an end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device, information about at least one second relay terminal that the first relay terminal passes through when accessing the network device is stored.

[0502] In some embodiments, sending a fourth message to each of the at least one second relay terminal includes:

[0503] Each second relay terminal is determined based on at least one second relay terminal that the first relay terminal passes through when accessing the network device.

[0504] Send a fourth message to each of the identified second relay terminals.

[0505] In some embodiments, the method further includes:

[0506] If an RRC connection establishment complete message is received from the remote terminal, perform at least one of the following operations:

[0507] Send a third message to the first relay terminal;

[0508] Send a fifth message to each of the at least one second relay terminal;

[0509] Send a sixth message to the remote terminal;

[0510] The third message includes at least one of the following:

[0511] The layer 2 identifier of the remote terminal;

[0512] The local identifier of the remote terminal;

[0513] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0514] The fifth message includes at least one of the following:

[0515] The layer 2 identifier of the remote terminal;

[0516] The local identifier of the remote terminal;

[0517] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB;

[0518] The sixth message includes at least one of the following:

[0519] The layer 2 identifier of the remote terminal;

[0520] The local identifier of the remote terminal;

[0521] In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or DRB.

[0522] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0523] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0524] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0525] In some embodiments, the egress radio resource control channel used by the second relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0526] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0527] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0528] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0529] It should be noted that all the implementation methods in the above embodiments are applicable to the embodiments of the information transmission method applied to the network device side, and can achieve the same technical effect, so they will not be described again here.

[0530] As shown in Figure 7, this embodiment of the present disclosure provides an information transmission method, executed by a remote terminal, including:

[0531] Step S701: Send an end-to-end Radio Resource Control (RRC) connection establishment completion message between the remote terminal and the network device to the first relay terminal using at least one of the following methods:

[0532] Transmitted using a second type of signaling radio bearer, which includes signaling radio bearer SRB0 numbered 0 and / or signaling radio bearer SRB1 numbered 1;

[0533] The message is sent via a second target egress radio link control channel, which is determined based on indication information contained in the RRC connection establishment message received by the remote terminal from the network device. The indication information is used to instruct the remote terminal to use the egress radio link control channel when sending the RRC connection establishment completion message.

[0534] In some embodiments, the method further includes:

[0535] Receive the sixth message sent by the network device;

[0536] The sixth message includes at least one of the following:

[0537] The layer 2 identifier of the remote terminal;

[0538] The local identifier of the remote terminal;

[0539] In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or the data radio bearer DRB.

[0540] It should be noted that all the implementation methods in the above embodiments are applicable to the embodiments of the information transmission method applied to the remote terminal side and can achieve the same technical effect, so they will not be described again here.

[0541] As shown in Figure 8, this embodiment of the present disclosure provides an information transmission device 800, applied to a first relay terminal, comprising:

[0542] The first sending unit 801 is configured to send a first message to a network device through at least one second relay terminal, wherein the first message carries at least a Layer 2 identifier of the remote terminal.

[0543] The first receiving unit 802 is configured to receive a second message sent by the network device, the second message including at least one of the following:

[0544] The layer 2 identifier of the remote terminal;

[0545] The local identifier of the remote terminal;

[0546] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's signaling radio bearer (SRB).

[0547] The first relay terminal is connected to the remote terminal via a direct communication interface, and the remote terminal is connected to the network device via the first relay terminal and the at least one second relay terminal.

[0548] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the signaling radio bearer (SRB) of the remote terminal includes at least one of the following:

[0549] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB.

[0550] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0551] In some embodiments, the apparatus further includes:

[0552] The first execution unit is configured to establish an end-to-end Radio Resource Control (RRC) connection with the network device via the at least one second relay terminal before sending the first message.

[0553] In some embodiments, after the first receiving unit 802 receives the second message sent by the network device, the apparatus further includes:

[0554] The second execution unit is configured to, upon receiving information transmitted by the remote terminal via the first relay wireless link control channel, perform at least one of the following operations:

[0555] Based on the second message, determine the transmission direction from the remote terminal to the network device, and forward the egress radio resource control channel used by the first type of signaling radio bearer of the remote terminal;

[0556] According to the second message, in the transmission direction from the remote terminal to the network device, the first relay terminal forwards the remote terminal's Layer 2 identifier or local identifier carried in the Direct Communication Link Relay Adaptation Layer (SRAP) header when forwarding the first type of signaling radio bearer of the remote terminal.

[0557] The first relay radio link control channel includes SL-RLC0 and / or SL-RLC1, and the first type of signaling radio bearer includes signaling radio bearer SRB0 (numbered 0) and / or signaling radio bearer SRB1 (numbered 1).

[0558] In some embodiments, after the first receiving unit 802 receives the second message sent by the network device, the apparatus further includes:

[0559] The fifth sending unit is configured to forward an RRC connection establishment message to the remote terminal in the transmission direction from the network device to the remote terminal using at least one of the following methods:

[0560] Forwarding is performed using a second relay radio link control channel, which includes SL-RLC0 and / or SL-RLC1;

[0561] Forwarded via a first target egress radio resource control channel, the first target egress radio resource control channel is determined based on the target identifier of the remote terminal, the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the information received by the first relay terminal, and the egress radio resource control channel used by the first relay terminal to forward the SRB of the remote terminal contained in the second message. The target identifier includes a layer 2 identifier or a local identifier.

[0562] In some embodiments, the apparatus further includes:

[0563] The fifth receiving unit is configured to receive a third message sent by the network device after an end-to-end RRC connection is established between the remote terminal and the network device, the third message including at least one of the following:

[0564] The layer 2 identifier of the remote terminal;

[0565] The local identifier of the remote terminal;

[0566] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0567] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0568] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0569] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0570] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0571] It should be noted that the division of units in the embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0572] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0573] As shown in Figure 9, this embodiment of the present disclosure also provides a relay terminal, which is a first relay terminal, including a processor 900, a transceiver 910, a memory 920, and a program stored in the memory 920 and executable on the processor 900; wherein the transceiver 910 is connected to the processor 900 and the memory 920 via a bus interface, and the processor 900 is used to read the program in the memory and execute the following processes:

[0574] A first message is sent to the network device through at least one second relay terminal, the first message carrying at least the Layer 2 identifier of the remote terminal;

[0575] The network device sends a second message, the second message including at least one of the following:

[0576] The layer 2 identifier of the remote terminal;

[0577] The local identifier of the remote terminal;

[0578] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's signaling radio bearer (SRB).

[0579] The first relay terminal is connected to the remote terminal via a direct communication interface, and the remote terminal is connected to the network device via the first relay terminal and the at least one second relay terminal.

[0580] Transceiver 910 is used to receive and send data under the control of processor 900.

[0581] In Figure 9, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 900 and memory represented by memory 920. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 910 can be multiple components, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, etc. For different user equipment, the user interface 930 can also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0582] The processor 900 is responsible for managing the bus architecture and general processing, while the memory 920 can store the data used by the processor 900 during operation.

[0583] In some embodiments, the processor 900 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may also adopt a multi-core architecture.

[0584] The processor executes any of the methods described in the embodiments of this disclosure by invoking a computer program stored in memory, according to the obtained executable instructions. The processor and memory may also be physically separated.

[0585] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the signaling radio bearer (SRB) of the remote terminal includes at least one of the following:

[0586] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB.

[0587] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0588] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0589] Before sending the first message, an end-to-end Radio Resource Control (RRC) connection is established with the network device through the at least one second relay terminal.

[0590] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0591] If information is received from the remote terminal via the first relay wireless link control channel, perform at least one of the following operations:

[0592] Based on the second message, determine the transmission direction from the remote terminal to the network device, and forward the egress radio resource control channel used by the first type of signaling radio bearer of the remote terminal;

[0593] According to the second message, in the transmission direction from the remote terminal to the network device, the first relay terminal forwards the remote terminal's Layer 2 identifier or local identifier carried in the Direct Communication Link Relay Adaptation Layer (SRAP) header when forwarding the first type of signaling radio bearer of the remote terminal.

[0594] The first relay radio link control channel includes SL-RLC0 and / or SL-RLC1, and the first type of signaling radio bearer includes signaling radio bearer SRB0 (numbered 0) and / or signaling radio bearer SRB1 (numbered 1).

[0595] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0596] In the transmission direction from the network device to the remote terminal, at least one of the following methods is used to forward the RRC connection establishment message to the remote terminal:

[0597] Forwarding is performed using a second relay radio link control channel, which includes SL-RLC0 and / or SL-RLC1;

[0598] Forwarded via a first target egress radio resource control channel, the first target egress radio resource control channel is determined based on the target identifier of the remote terminal, the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the information received by the first relay terminal, and the egress radio resource control channel used by the first relay terminal to forward the SRB of the remote terminal contained in the second message. The target identifier includes a layer 2 identifier or a local identifier.

[0599] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0600] After an end-to-end RRC connection is established between the remote terminal and the network device, a third message is received from the network device, the third message including at least one of the following:

[0601] The layer 2 identifier of the remote terminal;

[0602] The local identifier of the remote terminal;

[0603] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0604] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0605] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0606] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0607] It should be noted that the relay terminal provided in this embodiment can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0608] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of an information transmission method applied to a first relay terminal. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., compact disc (CD), digital video disc (DVD), Blu-ray disc (BD), high-definition versatile disc (HVD), etc.), and semiconductor storage (e.g., ROM, erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), non-volatile memory (NAND flash), solid-state drives (SSDs), etc.).

[0609] As shown in Figure 10, this embodiment of the present disclosure provides an information transmission device 1000, applied to a second relay terminal, comprising:

[0610] The second receiving unit 1001 is used to receive a first message sent by the first relay terminal, wherein the first message carries at least the layer 2 identifier of the remote terminal.

[0611] The second sending unit 1002 is used to send the first message to the network device;

[0612] The third receiving unit 1003 is configured to receive a fourth message sent by the network device, the fourth message including at least one of the following:

[0613] The layer 2 identifier of the remote terminal;

[0614] The local identifier of the remote terminal;

[0615] The second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal.

[0616] The first relay terminal is connected to the remote terminal via a direct communication interface; the second relay terminal is any one of the relay terminals between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the second relay terminal.

[0617] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal, including at least one of the following:

[0618] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0619] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0620] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0621] In some embodiments, after the third receiving unit 1003 receives the fourth message sent by the network device, the apparatus further includes:

[0622] The first determining unit is configured to determine the egress radio resource control channel for forwarding the information based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, as well as the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message, in the transmission direction from the remote terminal to the network device.

[0623] The target identifier includes a layer 2 identifier or a local identifier.

[0624] In some embodiments, after the third receiving unit 1003 receives the fourth message sent by the network device, the apparatus further includes:

[0625] The second determining unit is configured to determine the egress radio resource control channel for forwarding the information in the transmission direction from the network device to the remote terminal, based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, and the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message.

[0626] The target identifier includes a layer 2 identifier or a local identifier.

[0627] In some embodiments, the apparatus further includes:

[0628] The sixth receiving unit is configured to receive a fifth message sent by the network device after an end-to-end RRC connection is established between the remote terminal and the network device, the fifth message including at least one of the following:

[0629] The layer 2 identifier of the remote terminal;

[0630] The local identifier of the remote terminal;

[0631] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0632] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or data radio bearer DRB, including at least one of the following:

[0633] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0634] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0635] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0636] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0637] It should be noted that the division of units in the embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0638] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0639] This disclosure also provides a relay terminal, which is a second relay terminal. The structure of the second relay terminal is shown in Figure 9, and will not be described in detail here.

[0640] The processor is configured to read the computer program from the memory and perform the following operations:

[0641] Receive a first message sent by the first relay terminal, wherein the first message carries at least the Layer 2 identifier of the remote terminal;

[0642] Send the first message to the network device;

[0643] Receive a fourth message sent by the network device, the fourth message including at least one of the following:

[0644] The layer 2 identifier of the remote terminal;

[0645] The local identifier of the remote terminal;

[0646] The second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal.

[0647] The first relay terminal is connected to the remote terminal via a direct communication interface; the second relay terminal is any one of the relay terminals between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the second relay terminal.

[0648] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal, including at least one of the following:

[0649] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0650] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0651] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0652] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0653] In the transmission direction from the remote terminal to the network device, the egress radio resource control channel for forwarding the information is determined based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, as well as the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message.

[0654] The target identifier includes a layer 2 identifier or a local identifier.

[0655] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0656] In the transmission direction from the network device to the remote terminal, the egress radio resource control channel for forwarding the information is determined based on the target identifier of the remote terminal and the end-to-end bearer identifier between the remote terminal and the network device contained in the SRAP header of the received information, as well as the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal in the fourth message.

[0657] The target identifier includes a layer 2 identifier or a local identifier.

[0658] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0659] After the end-to-end RRC connection between the remote terminal and the network device is established, a fifth message is received from the network device, the fifth message including at least one of the following:

[0660] The layer 2 identifier of the remote terminal;

[0661] The local identifier of the remote terminal;

[0662] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0663] In some embodiments, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or data radio bearer DRB, including at least one of the following:

[0664] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0665] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0666] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0667] It should be noted that the second relay terminal provided in this embodiment can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0668] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of an information transmission method applied to a second relay terminal. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs), etc.).

[0669] As shown in Figure 11, this embodiment of the present disclosure provides an information transmission device 1100, applied to a network device, comprising:

[0670] The fourth receiving unit 1101 is used to receive a first message sent by the first relay terminal through at least one second relay terminal, wherein the first message carries at least the layer 2 identifier of the remote terminal.

[0671] The third sending unit 1102 is used to send a second message to the first relay terminal and a fourth message to the at least one second relay terminal respectively;

[0672] The second message includes at least one of the following:

[0673] The layer 2 identifier of the remote terminal;

[0674] The local identifier of the remote terminal;

[0675] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's signaling radio bearer (SRB).

[0676] The fourth message includes at least one of the following:

[0677] The layer 2 identifier of the remote terminal;

[0678] The local identifier of the remote terminal;

[0679] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0680] The first relay terminal is connected to the remote terminal via a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal.

[0681] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the signaling radio bearer (SRB) of the remote terminal includes at least one of the following:

[0682] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB.

[0683] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0684] In some embodiments, the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal includes at least one of the following:

[0685] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal.

[0686] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0687] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0688] In some embodiments, the apparatus further includes:

[0689] The storage unit is used to store information about at least one second relay terminal that the first relay terminal passes through when accessing the network device during the process of establishing an end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device.

[0690] In some embodiments, the third transmitting unit 1102 is further configured to:

[0691] Each second relay terminal is determined based on at least one second relay terminal that the first relay terminal passes through when accessing the network device.

[0692] Send a fourth message to each of the identified second relay terminals.

[0693] In some embodiments, the apparatus further includes:

[0694] The third execution unit is configured to, upon receiving an RRC connection establishment complete message from the remote terminal, execute at least one of the following operations:

[0695] Send a third message to the first relay terminal;

[0696] Send a fifth message to each of the at least one second relay terminal;

[0697] Send a sixth message to the remote terminal;

[0698] The third message includes at least one of the following:

[0699] The layer 2 identifier of the remote terminal;

[0700] The local identifier of the remote terminal;

[0701] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0702] The fifth message includes at least one of the following:

[0703] The layer 2 identifier of the remote terminal;

[0704] The local identifier of the remote terminal;

[0705] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB;

[0706] The sixth message includes at least one of the following:

[0707] The layer 2 identifier of the remote terminal;

[0708] The local identifier of the remote terminal;

[0709] In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or DRB.

[0710] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0711] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0712] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0713] In some embodiments, the egress radio resource control channel used by the second relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0714] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0715] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0716] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0717] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0718] It should be noted that the division of units in the embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0719] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0720] As shown in Figure 12, this embodiment of the present disclosure also provides a network device, including a processor 1200, a transceiver 1210, a memory 1220, and a program stored in the memory 1220 and executable on the processor 1200; wherein the transceiver 1210 is connected to the processor 1200 and the memory 1220 via a bus interface, wherein the processor 1200 is used to read the program in the memory and execute the following process: wherein the processor is used to read the computer program in the memory and perform the following operations:

[0721] Receive a first message sent by a first relay terminal through at least one second relay terminal, wherein the first message carries at least a Layer 2 identifier of the remote terminal;

[0722] Sending a second message to the first relay terminal and sending a fourth message to each of the at least one second relay terminal; the second message includes at least one of the following:

[0723] The layer 2 identifier of the remote terminal;

[0724] The local identifier of the remote terminal;

[0725] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's signaling radio bearer (SRB).

[0726] The fourth message includes at least one of the following:

[0727] The layer 2 identifier of the remote terminal;

[0728] The local identifier of the remote terminal;

[0729] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB;

[0730] The first relay terminal is connected to the remote terminal via a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal.

[0731] Transceiver 1210 is used to receive and send data under the control of processor 1200.

[0732] In Figure 12, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 1200 and memory represented by memory 1220. The bus architecture may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. Transceiver 1210 may be multiple components, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, etc. For different user equipment, user interface 1230 may also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0733] The processor 1200 is responsible for managing the bus architecture and general processing, while the memory 1220 can store the data used by the processor 1200 when performing operations.

[0734] In some embodiments, the processor 1200 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (CPLD), and the processor may also adopt a multi-core architecture.

[0735] The processor executes any of the methods described in the embodiments of this disclosure by invoking a computer program stored in memory, according to the obtained executable instructions. The processor and memory may also be physically separated.

[0736] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the signaling radio bearer (SRB) of the remote terminal includes at least one of the following:

[0737] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface egress radio resource control channel used by the remote terminal's SRB.

[0738] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB.

[0739] In some embodiments, the egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal includes at least one of the following:

[0740] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the signaling radio bearer (SRB) of the remote terminal.

[0741] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB.

[0742] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0743] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0744] During the process of establishing an end-to-end Radio Resource Control (RRC) connection between the first relay terminal and the network device, information about at least one second relay terminal that the first relay terminal passes through when accessing the network device is stored.

[0745] In some embodiments, the processor is configured to read a computer program from the memory and perform the following operations:

[0746] Each second relay terminal is determined based on at least one second relay terminal that the first relay terminal passes through when accessing the network device.

[0747] Send a fourth message to each of the identified second relay terminals.

[0748] In some embodiments, the processor is configured to read a computer program from the memory and perform the following operations:

[0749] If an RRC connection establishment complete message is received from the remote terminal, perform at least one of the following operations:

[0750] Send a third message to the first relay terminal;

[0751] Send a fifth message to each of the at least one second relay terminal;

[0752] Send a sixth message to the remote terminal;

[0753] The third message includes at least one of the following:

[0754] The layer 2 identifier of the remote terminal;

[0755] The local identifier of the remote terminal;

[0756] The first relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0757] The fifth message includes at least one of the following:

[0758] The layer 2 identifier of the remote terminal;

[0759] The local identifier of the remote terminal;

[0760] The second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB;

[0761] The sixth message includes at least one of the following:

[0762] The layer 2 identifier of the remote terminal;

[0763] The local identifier of the remote terminal;

[0764] In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or DRB.

[0765] In some embodiments, the egress radio resource control channel used by the first relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0766] In the transmission direction from the remote terminal to the network device, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0767] In the transmission direction from the network device to the remote terminal, the first relay terminal forwards the direct communication interface exit radio resource control channel used by the remote terminal's SRB and / or DRB.

[0768] In some embodiments, the egress radio resource control channel used by the second relay terminal to forward the SRB and / or DRB of the remote terminal includes at least one of the following:

[0769] In the transmission direction from the remote terminal to the network device, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0770] In the transmission direction from the network device to the remote terminal, the second relay terminal forwards the egress radio resource control channel used by the remote terminal's SRB and / or DRB.

[0771] Wherein, if there is a Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the Uu interface outgoing radio resource control channel in the transmission direction from the remote terminal to the network device, and the outgoing radio resource control channel is the direct communication interface outgoing radio resource control channel in the transmission direction from the network device to the remote terminal; if there is no Uu interface between the second relay terminal and the network device, the outgoing radio resource control channel is the direct communication interface radio resource control channel.

[0772] It should be noted that the network device provided in this embodiment can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0773] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of an information transmission method applied to a network device. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs)).

[0774] As shown in Figure 13, this embodiment of the present disclosure provides an information transmission device 1300, applied to a remote terminal, comprising:

[0775] The fourth transmitting unit 1301 is configured to transmit an end-to-end Radio Resource Control (RRC) connection establishment completion message between the remote terminal and the network device to the first relay terminal using at least one of the following methods:

[0776] Transmitted using a second type of signaling radio bearer, which includes signaling radio bearer SRB0 numbered 0 and / or signaling radio bearer SRB1 numbered 1;

[0777] The message is sent via a second target egress radio link control channel, which is determined based on indication information contained in the RRC connection establishment message received by the remote terminal from the network device. The indication information is used to instruct the remote terminal to use the egress radio link control channel when sending the RRC connection establishment completion message.

[0778] In some embodiments, the apparatus further includes:

[0779] The seventh receiving unit is used to receive the sixth message sent by the network device;

[0780] The sixth message includes at least one of the following:

[0781] The layer 2 identifier of the remote terminal;

[0782] The local identifier of the remote terminal;

[0783] In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or the data radio bearer DRB.

[0784] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0785] It should be noted that the division of units in the embodiments of this disclosure is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0786] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to related technologies, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0787] This disclosure also provides a remote terminal, the structure of which is shown in Figure 9 and will not be described in detail here.

[0788] The processor is configured to read the computer program from the memory and perform the following operations:

[0789] Send an end-to-end Radio Resource Control (RRC) connection establishment completion message between the remote terminal and the network device to the first relay terminal using at least one of the following methods:

[0790] Transmitted using a second type of signaling radio bearer, which includes signaling radio bearer SRB0 numbered 0 and / or signaling radio bearer SRB1 numbered 1;

[0791] The message is sent via a second target egress radio link control channel, which is determined based on indication information contained in the RRC connection establishment message received by the remote terminal from the network device. The indication information is used to instruct the remote terminal to use the egress radio link control channel when sending the RRC connection establishment completion message.

[0792] In some embodiments, the processor, for reading a computer program from the memory, also performs the following operations:

[0793] Receive the sixth message sent by the network device;

[0794] The sixth message includes at least one of the following:

[0795] The layer 2 identifier of the remote terminal;

[0796] The local identifier of the remote terminal;

[0797] In the transmission direction from the remote terminal to the network device, the remote terminal transmits the egress radio resource control channel used by the SRB and / or the data radio bearer DRB.

[0798] It should be noted that the remote terminal provided in this embodiment can implement all the method steps implemented in the above method embodiment and achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0799] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of an information transmission method applied to a remote terminal. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs)).

[0800] This disclosure also provides a computer program product, including computer instructions. When executed by a processor, these computer instructions implement the various processes in the above method embodiments and achieve the same technical effects. To avoid repetition, further details are omitted here.

[0801] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0802] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0803] These processor-executable instructions may also be stored in a processor-readable memory that can instruct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0804] These processor-executable 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 functions specified in one or more flowcharts and / or one or more block diagrams.

[0805] Furthermore, it should be noted that in the apparatus and method of this disclosure, it is obvious that the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered equivalent solutions of this disclosure. Moreover, the steps performing the above series of processes can naturally be executed in the order described, but are not necessarily required to be executed in chronological order; some steps can be executed in parallel or independently of each other. Those skilled in the art will understand that all or any step or component of the method and apparatus of this disclosure can be implemented in any computing device (including processors, storage media, etc.) or network of computing devices, in hardware, firmware, software, or a combination thereof, which can be achieved by those skilled in the art using their basic programming skills after reading the description of this disclosure.

[0806] It should be noted that the above division of modules is merely a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, these modules can be implemented entirely in software via processing element calls; they can be fully implemented in hardware; or some modules can be implemented by processing element calls to software, while others are implemented in hardware. For example, a module can be a separate processing element, or it can be integrated into a chip in the aforementioned device. Alternatively, it can be stored as program code in the memory of the aforementioned device, and its function can be called and executed by a processing element of the device. The implementation of other modules is similar. Moreover, these modules can be fully or partially integrated together, or they can be implemented independently. The processing element mentioned here can be an integrated circuit with signal processing capabilities. In the implementation process, each step of the above method or each of the above modules can be completed through integrated logic circuits in the hardware of the processor element or through software instructions.

[0807] For example, each module, unit, subunit, or submodule can be one or more integrated circuits configured to implement the above methods, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs). As another example, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together to implement a system-on-a-chip (SOC).

[0808] The terms “first,” “second,” etc., used in this disclosure and in the claims are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this disclosure described herein may be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. Additionally, the use of “and / or” in the specification and claims indicates at least one of the connected objects, such as A and / or B and / or C, indicating seven possibilities: A alone, B alone, C alone, and both A and B, both B and C, both A and C, and A, B, and C. Similarly, the use of “at least one of A and B” in this specification and claims should be understood as “A alone, B alone, or both A and B.”

[0809] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

A method for information transmission, applied to a first relay terminal, the method comprising: sending, by at least one second relay terminal, a first message to a network device, the first message carrying at least a layer-two identifier of a remote terminal; receiving a second message sent by the network device, the second message comprising at least one of: the layer-two identifier of the remote terminal; a local identifier of the remote terminal; an egress radio resource control channel used by the first relay terminal to forward a signaling radio bearer (SRB) of the remote terminal; wherein the first relay terminal is connected to the remote terminal through a direct communication interface, and the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal. The method of claim 1, further comprising: establishing, by the at least one second relay terminal, an end-to-end radio resource control (RRC) connection with a network device, before sending the first message. The method of claim 1, wherein, After receiving the second message sent by the network device, the method further comprises: if receiving information sent by the remote terminal through a first relay radio link control (RLC) channel, performing at least one of the following operations: determining, according to the second message, an egress radio resource control channel used by the first relay terminal to forward a first type of signaling radio bearer of the remote terminal in a transmission direction from the remote terminal to the network device; determining, according to the second message, a layer-two identifier or a local identifier of the remote terminal carried in a sidelink relay adaptation protocol (SRAP) header of the first relay terminal in the transmission direction from the remote terminal to the network device, when the first relay terminal forwards the first type of signaling radio bearer of the remote terminal; wherein the first relay RLC channel comprises SL-RLC0 and / or SL-RLC1, and the first type of signaling radio bearer comprises a signaling radio bearer (SRB) 0 and / or a SRB 1. The method of claim 1, wherein, After receiving the second message sent by the network device, the method further comprises: in a transmission direction from the network device to the remote terminal, forwarding a RRC connection establishment message to the remote terminal by using at least one of: a second relay RLC channel, the second relay RLC channel comprising SL-RLC0 and / or SL-RLC1; a first target egress radio resource control channel, the first target egress radio resource control channel being determined according to a target identifier of the remote terminal contained in an SRAP header of the information received by the first relay terminal, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel used by the first relay terminal to forward an SRB of the remote terminal, which is contained in the second message, the target identifier comprising a layer-two identifier or a local identifier. The method of claim 1, further comprising: after an end-to-end RRC connection between the remote terminal and the network device is established, receiving a third message sent by the network device, the third message comprising at least one of: the layer-two identifier of the remote terminal; The local identifier of the remote terminal; The first relay terminal forwards an exit radio resource control channel used by SRB and / or data radio bearer DRB of the remote terminal. An information transmission method applied to a second relay terminal, the method comprising: receiving a first message sent by a first relay terminal, the first message carrying at least a layer-two identifier of a remote terminal; sending the first message to a network device; receiving a fourth message sent by the network device, the fourth message comprising at least one of the following: the layer-two identifier of the remote terminal; the local identifier of the remote terminal; an exit radio resource control channel used by SRB of the remote terminal forwarded by the second relay terminal; wherein the first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; the remote terminal is connected with the network device through the first relay terminal and the second relay terminal. The method of claim 6, wherein, After the receiving of the fourth message sent by the network device, the method further comprises: in a transmission direction from the remote terminal to the network device, determining an exit radio resource control channel for forwarding information according to a target identifier of the remote terminal contained in an SRAP header of the received information, an end-to-end bearer identifier between the remote terminal and the network device, and the exit radio resource control channel used by SRB of the remote terminal forwarded by the second relay terminal in the fourth message; wherein the target identifier comprises a layer-two identifier or a local identifier. The method according to claim 6, the method further comprising: in a transmission direction from the network device to the remote terminal, determining an exit radio resource control channel for forwarding information according to a target identifier of the remote terminal contained in an SRAP header of the received information, an end-to-end bearer identifier between the remote terminal and the network device, and the exit radio resource control channel used by SRB of the remote terminal forwarded by the second relay terminal in the fourth message; wherein the target identifier comprises a layer-two identifier or a local identifier. The method according to claim 6, the method further comprising: after an end-to-end RRC connection between the remote terminal and the network device is established, receiving a fifth message sent by the network device, the fifth message comprising at least one of the following: the layer-two identifier of the remote terminal; the local identifier of the remote terminal; an exit radio resource control channel used by SRB and / or data radio bearer DRB of the remote terminal forwarded by the second relay terminal. An information transmission method applied to a network device, the method comprising: receiving a first message sent by a first relay terminal through at least one second relay terminal, the first message carrying at least a layer-two identifier of a remote terminal; sending a second message to the first relay terminal and sending a fourth message to the at least one second relay terminal respectively; the second message comprising at least one of the following: the layer-two identifier of the remote terminal; the local identifier of the remote terminal; The first relay terminal forwards an egress radio resource control channel used by a signaling radio bearer (SRB) of the remote terminal; The fourth message includes at least one of: a layer two identifier of the remote terminal; a local identifier of the remote terminal; The second relay terminal forwards an egress radio resource control channel used by a SRB of the remote terminal; The first relay terminal is connected to the remote terminal through a direct communication interface; the second relay terminal is any one of the relay terminals between the first relay terminal and the network device; the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal. The method of claim 10, further comprising: In an end-to-end radio resource control (RRC) connection establishment process between the first relay terminal and the network device, storing information of at least one second relay terminal through which the first relay terminal accesses the network device. The method of claim 11, wherein, sending a fourth message to each of the at least one second relay terminal, including: determining each second relay terminal according to at least one second relay terminal through which the first relay terminal accesses the network device; sending a fourth message to each determined second relay terminal. The method of claim 10, further comprising: if receiving an RRC connection establishment completion message sent by the remote terminal, performing at least one of the following operations: sending a third message to the first relay terminal; sending a fifth message to each of the at least one second relay terminal; sending a sixth message to the remote terminal; The third message includes at least one of: a layer two identifier of the remote terminal; a local identifier of the remote terminal; The first relay terminal forwards an egress radio resource control channel used by a SRB and / or a data radio bearer (DRB) of the remote terminal; The fifth message includes at least one of: a layer two identifier of the remote terminal; a local identifier of the remote terminal; The second relay terminal forwards an egress radio resource control channel used by a SRB and / or a DRB of the remote terminal; The sixth message includes at least one of: a layer two identifier of the remote terminal; a local identifier of the remote terminal; In a transmission direction from the remote terminal to the network device, the remote terminal sends an egress radio resource control channel used by a SRB and / or a DRB. An information transmission method applied to a remote terminal, the method comprising: sending an end-to-end radio resource control (RRC) connection establishment completion message between the remote terminal and a network device to a first relay terminal in at least one of the following ways: using a second type signaling radio bearer, the second type signaling radio bearer including a signaling radio bearer (SRB) 0 numbered 0 and / or a signaling radio bearer (SRB) 1 numbered 1; transmitting, by a second target egress radio link control channel, the second target egress radio link control channel being determined according to indication information contained in an RRC connection setup message received by the remote terminal from the network device, the indication information being used to indicate an egress radio link control channel used by the remote terminal to transmit an RRC connection setup complete message. The method of claim 14, further comprising: receiving a sixth message transmitted by the network device; wherein the sixth message comprises at least one of: a layer two identity of the remote terminal; a local identity of the remote terminal; transmitting, by the remote terminal, an egress radio resource control channel used by SRBs and / or data radio bearers (DRBs) in a transmission direction of the remote terminal to the network device. A relay terminal, the relay terminal being a first relay terminal, comprising a memory, a transceiver, and a processor: the memory configured to store computer programs; the transceiver configured to transceive data under control of the processor; and the processor configured to read the computer programs in the memory and perform the following operations: transmitting, by the first relay terminal, a first message to a network device via at least one second relay terminal, the first message carrying at least a layer two identity of a remote terminal; receiving a second message transmitted by the network device, the second message comprising at least one of: the layer two identity of the remote terminal; the local identity of the remote terminal; forwarding, by the first relay terminal, an egress radio resource control channel used by signaling radio bearers (SRBs) of the remote terminal; wherein the first relay terminal being connected with the remote terminal via a direct communication interface, and the remote terminal being connected with the network device via the first relay terminal and the at least one second relay terminal. The relay terminal according to claim 16, wherein the processor configured to read the computer programs in the memory and further perform the following operations: establishing, by the at least one second relay terminal, an end-to-end radio resource control (RRC) connection with the network device before transmitting the first message. The relay terminal according to claim 16, wherein the processor configured to read the computer programs in the memory and further perform the following operations: if receiving information transmitted by the remote terminal via a first relay radio link control channel, performing at least one of the following operations: determining, according to the second message, to forward an egress radio resource control channel used by a first type of signaling radio bearers of the remote terminal in a transmission direction of the remote terminal to the network device; determining, according to the second message, to forward, by the first relay terminal, a layer two identity or a local identity of the remote terminal carried in a sidelink relay adaptation protocol (SRAP) header in a direct communication link when forwarding the first type of signaling radio bearers of the remote terminal in the transmission direction of the remote terminal to the network device; wherein the first relay radio link control channel comprises SL-RLC0 and / or SL-RLC1, and the first type of signaling radio bearers comprises a signaling radio bearer (SRB) 0 and / or a signaling radio bearer (SRB) 1. The relay terminal according to claim 16, wherein the processor configured to read the computer programs in the memory and further perform the following operations: In the transmission direction from the network device to the remote terminal, at least one of the following is used to forward the RRC connection setup message to the remote terminal: using a second relay radio link control channel, the second relay radio link control channel including SL-RLC0 and / or SL-RLC1; using a first target egress radio resource control channel, the first target egress radio resource control channel being determined according to a target identifier of the remote terminal included in an SRAP header of the information received by the first relay terminal, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel used by the first relay terminal to forward the SRB of the remote terminal included in the second message, the target identifier including a layer two identifier or a local identifier. The relay terminal according to claim 16, wherein The processor is configured to read the computer program in the memory and perform the following operations: after the end-to-end RRC connection between the remote terminal and the network device is established, receiving a third message sent by the network device, the third message including at least one of the following: a layer two identifier of the remote terminal; a local identifier of the remote terminal; an egress radio resource control channel used by the first relay terminal to forward the SRB and / or data radio bearer (DRB) of the remote terminal. A relay terminal, the relay terminal being a second relay terminal, comprising a memory, a transceiver, and a processor: The memory is configured to store a computer program; the transceiver is configured to transceive data under the control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations: receiving a first message sent by a first relay terminal, the first message carrying at least a layer two identifier of a remote terminal; sending the first message to a network device; receiving a fourth message sent by the network device, the fourth message including at least one of the following: a layer two identifier of the remote terminal; a local identifier of the remote terminal; an egress radio resource control channel used by the second relay terminal to forward a signaling radio bearer (SRB) of the remote terminal; wherein the first relay terminal is connected to the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; and the remote terminal is connected to the network device through the first relay terminal and the second relay terminal. The relay terminal according to claim 21, wherein The processor is configured to read the computer program in the memory and perform the following operations: in the transmission direction from the remote terminal to the network device, determining an egress radio resource control channel to forward the information according to a target identifier of the remote terminal included in an SRAP header of the received information, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel used by the second relay terminal to forward the SRB of the remote terminal included in the fourth message; wherein the target identifier includes a layer two identifier or a local identifier. The relay terminal according to claim 21, wherein The processor is configured to read the computer program in the memory and perform the following operations: In a transmission direction from the network device to the remote terminal, an egress radio resource control channel for forwarding the information is determined according to a target identifier of the remote terminal included in an SRAP header of the received information, an end-to-end bearer identifier between the remote terminal and the network device, and an egress radio resource control channel for forwarding SRB of the remote terminal used by the second relay terminal in the fourth message. The target identifier includes a layer two identifier or a local identifier. The relay terminal according to claim 21, wherein The processor is configured to read the computer program in the memory and perform the following operations: After the end-to-end RRC connection between the remote terminal and the network device is established, a fifth message sent by the network device is received, and the fifth message includes at least one of the following: a layer two identifier of the remote terminal; a local identifier of the remote terminal; an egress radio resource control channel for forwarding SRB and / or data radio bearer (DRB) of the remote terminal used by the second relay terminal. A network device includes a memory, a transceiver, and a processor: The memory is configured to store a computer program; the transceiver is configured to transceive data under control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations: receiving a first message sent by a first relay terminal through at least one second relay terminal, the first message carrying at least a layer two identifier of a remote terminal; sending a second message to the first relay terminal and sending a fourth message to the at least one second relay terminal respectively; the second message includes at least one of the following: a layer two identifier of the remote terminal; a local identifier of the remote terminal; an egress radio resource control channel for forwarding signaling radio bearer (SRB) of the remote terminal used by the first relay terminal; the fourth message includes at least one of the following: a layer two identifier of the remote terminal; a local identifier of the remote terminal; an egress radio resource control channel for forwarding SRB of the remote terminal used by the second relay terminal; wherein, The first relay terminal is connected to the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; and the remote terminal is connected to the network device through the first relay terminal and the at least one second relay terminal. The network device of claim 25, wherein, The processor is configured to read the computer program in the memory and perform the following operations: In an end-to-end radio resource control (RRC) connection establishment process between the first relay terminal and the network device, information of at least one second relay terminal through which the first relay terminal accesses the network device is stored. The network device of claim 26, wherein, The processor is configured to read the computer program in the memory and perform the following operations: determining each second relay terminal according to the at least one second relay terminal through which the first relay terminal accesses the network device; sending a fourth message to each determined second relay terminal respectively. The network device of claim 25, wherein, The processor is configured to read the computer program in the memory and perform the following operations: If an RRC connection establishment complete message sent by the remote terminal is received, at least one of the following operations is performed: sending a third message to the first relay terminal; sending a fifth message to the at least one second relay terminal respectively; sending a sixth message to the remote terminal; wherein the third message comprises at least one of: a layer two identity of the remote terminal; a local identity of the remote terminal; an egress radio resource control channel used by the first relay terminal for forwarding SRB and / or data radio bearer (DRB) of the remote terminal; the fifth message comprises at least one of: a layer two identity of the remote terminal; a local identity of the remote terminal; an egress radio resource control channel used by the second relay terminal for forwarding SRB and / or DRB of the remote terminal; the sixth message comprises at least one of: a layer two identity of the remote terminal; a local identity of the remote terminal; an egress radio resource control channel used by the remote terminal for transmitting SRB and / or DRB in a transmission direction from the remote terminal to the network device. A remote terminal, comprising a memory, a transceiver, and a processor: the memory is configured to store a computer program; the transceiver is configured to transceive data under control of the processor; and the processor is configured to read the computer program in the memory and perform the following operations: sending an end-to-end radio resource control (RRC) connection setup complete message between the remote terminal and a network device to a first relay terminal in at least one of the following manners: using a second type signaling radio bearer, the second type signaling radio bearer comprising a signaling radio bearer (SRB) 0 numbered 0 and / or a SRB 1 numbered 1; through a second target egress radio link control channel, the second target egress radio link control channel being determined according to indication information contained in an RRC connection setup message received by the remote terminal from the network device, the indication information being used to indicate an egress radio link control channel used by the remote terminal for sending the RRC connection setup complete message. The remote terminal of claim 29, wherein, the processor, when reading the computer program in the memory, is further configured to perform the following operations: receiving a sixth message sent by the network device; wherein the sixth message comprises at least one of: a layer two identity of the remote terminal; a local identity of the remote terminal; an egress radio resource control channel used by the remote terminal for transmitting SRB and / or data radio bearer (DRB) in a transmission direction from the remote terminal to the network device. An information transmission apparatus applied to a first relay terminal, the apparatus comprising: a first sending unit configured to send a first message to a network device through at least one second relay terminal, the first message carrying at least a layer two identity of a remote terminal; a first receiving unit configured to receive a second message sent by the network device, the second message comprising at least one of: a layer two identity of the remote terminal; a local identity of the remote terminal; an egress radio resource control channel used by the first relay terminal for forwarding signaling radio bearer (SRB) of the remote terminal; The first relay terminal is connected with the remote terminal through a direct communication interface, and the remote terminal is connected with the network device through the first relay terminal and the at least one second relay terminal. An information transmission apparatus is applied to a second relay terminal, and the apparatus comprises: A second receiving unit is configured to receive a first message sent by a first relay terminal, wherein the first message carries at least a layer two identifier of a remote terminal; A second sending unit is configured to send the first message to a network device; A third receiving unit is configured to receive a fourth message sent by the network device, wherein the fourth message comprises at least one of the following: The layer two identifier of the remote terminal; A local identifier of the remote terminal; An exit radio resource control channel used by the second relay terminal for forwarding a signaling radio bearer (SRB) of the remote terminal; The first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; and the remote terminal is connected with the network device through the first relay terminal and the second relay terminal. An information transmission apparatus is applied to a network device, and the apparatus comprises: A fourth receiving unit is configured to receive a first message sent by a first relay terminal through at least one second relay terminal, wherein the first message carries at least a layer two identifier of a remote terminal; A third sending unit is configured to send a second message to the first relay terminal and send a fourth message to the at least one second relay terminal respectively; The second message comprises at least one of the following: The layer two identifier of the remote terminal; The local identifier of the remote terminal; An exit radio resource control channel used by the first relay terminal for forwarding a signaling radio bearer (SRB) of the remote terminal; The fourth message comprises at least one of the following: The layer two identifier of the remote terminal; The local identifier of the remote terminal; An exit radio resource control channel used by the second relay terminal for forwarding the SRB of the remote terminal; The first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; and the remote terminal is connected with the network device through the first relay terminal and the at least one second relay terminal. An information transmission apparatus is applied to a remote terminal, and the apparatus comprises: A fourth sending unit is configured to send an end-to-end radio resource control (RRC) connection establishment completion message between the remote terminal and a network device to a first relay terminal in at least one of the following ways: Using a second type signaling radio bearer, wherein the second type signaling radio bearer comprises a signaling radio bearer (SRB) 0 numbered 0 and / or a signaling radio bearer (SRB) 1 numbered 1; The first relay terminal is connected with the remote terminal through a direct communication interface; the second relay terminal is any relay terminal between the first relay terminal and the network device; and the remote terminal is connected with the network device through the first relay terminal and the at least one second relay terminal. The second target egress radio link control channel is determined according to indication information contained in an RRC connection setup message received by the remote terminal from the network device, the indication information being used to indicate an egress radio link control channel used by the remote terminal to send an RRC connection setup complete message. A processor-readable storage medium, wherein, The processor readable storage medium stores a program for causing the processor to perform the method of any one of claims 1-5, 6-9, 10-13, 14-15.

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