A data transmission method and related apparatus

Abstract

This application provides a data transmission method and related apparatus. Because the first adapter layer entity of the first terminal device can deliver the first data and the first instruction information to the second adapter layer entity of the first terminal device, the second adapter layer entity of the first terminal device can correctly deliver the first data to the second RLC bearer according to the first instruction information, thereby improving the reliability of downlink data transmission.

Description

[0001] This application is a divisional application. The original application has the application number 202111223655.1 and the original application date is October 20, 2021. The entire contents of the original application are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a data transmission method and related apparatus. Background Technology

[0003] Currently, in relay technology, remote terminal devices can communicate with base stations through relay terminal devices. For example, data packets from remote terminal devices can be relayed and forwarded on the radio link control (RLC) bearer of the relay terminal device. An RLC bearer can include a radio link control (RLC) layer entity and a logical channel of a media access control (MAC) layer. Understandably, in relay technology, an adaptation layer can be added between the RLC layer and the packet data convergence protocol (PDCP) layer to achieve bearer multiplexing and demultiplexing. That is, it supports the multiplexing of data on at least one radio bearer from different remote terminal devices onto a single RLC bearer, or the splitting of data on an RLC bearer across different radio bearers.

[0004] However, in existing protocol designs, when a base station configures RLC bearers, one RLC bearer corresponds to one PDCP entity or one radio bearer (RB), meaning that bearer multiplexing and demultiplexing are not supported. Therefore, when radio bearer (RB) multiplexing and demultiplexing occur, it may lead to problems with the correct delivery of downlink data to remote terminal equipment. Thus, in scenarios involving RB multiplexing and demultiplexing, how to correctly deliver downlink data has become a pressing technical problem that needs to be solved at this stage. Summary of the Invention

[0005] This application provides a data transmission method and related apparatus, which enables the correct delivery of downlink data.

[0006] In a first aspect, a data transmission method is provided, the method being applied to a first terminal device, wherein the first terminal device uses a first radio link control (RLC) bearer when communicating with an access network device, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer being used to transmit data from the at least one terminal device, the method comprising:

[0007] The first adaptation layer entity of the first terminal device delivers the first data and the first indication information to the second adaptation layer entity of the first terminal device. The first indication information is used to indicate the wireless bearer corresponding to the second terminal device that transmits the first data. The second terminal device is a terminal device among the at least one terminal device.

[0008] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first instruction information. The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

[0009] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the second RLC bearer according to the first instruction information, thereby improving the reliability of downlink data transmission.

[0010] Optionally, the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device; or,

[0011] The first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device.

[0012] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the correct RLC bearer.

[0013] Optionally, the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first indication information, including:

[0014] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence;

[0015] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0016] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, thereby enabling the second adaptation layer entity of the first terminal device to deliver the data correctly and improving the reliability of downlink data transmission.

[0017] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device, the method further includes:

[0018] The second adaptation layer entity of the first terminal device determines the sidelink based on the identifier of the second terminal device and the second correspondence; the sidelink is the sidelink between the first terminal device and the second terminal device, and at least one RLC bearer corresponds to the sidelink; the second correspondence includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device;

[0019] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including:

[0020] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0021] As can be seen, in the above technical solution, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device needs to determine the side link based on the identifier of the second terminal device and the second correspondence, so that the data can be delivered to the corresponding side link; furthermore, the first data can be delivered to the second RLC bearer in at least one RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby improving the reliability of downlink data transmission.

[0022] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, wherein the sidelink is a sidelink between the first terminal device and the second terminal device, and at least one RLC bearer corresponds to the sidelink, the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including:

[0023] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0024] As can be seen, in the above technical solution, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device can deliver the data to the corresponding side link; furthermore, according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, the first data is delivered to the second RLC bearer in at least one RLC bearer, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver the data and improving the reliability of downlink data transmission.

[0025] Optionally, the first indication information may also include the identifier of the second terminal device.

[0026] As can be seen, in the above technical solution, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the first adaptation layer entity of the first terminal device can also deliver the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby improving the reliability of downlink data transmission.

[0027] Optionally, the method further includes:

[0028] The second adaptation layer entity of the first terminal device generates second data; the second data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer, or the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device;

[0029] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including:

[0030] The second adaptation layer entity of the first terminal device delivers the second data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0031] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the second data to the second RLC bearer, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby improving the reliability of downlink data transmission.

[0032] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device, the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first indication information, including:

[0033] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence.

[0034] The third correspondence includes the correspondence between the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the identifier of the second RLC bearer.

[0035] As can be seen, in the above technical solution, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device can deliver the data to the corresponding side link; furthermore, according to the identifier of the radio bearer, the identifier information of the unicast connection on the side link and the third correspondence, the first data is delivered to the second RLC bearer, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver the data and improving the reliability of downlink data transmission.

[0036] Optionally, the method further includes:

[0037] The second adaptation layer entity of the first terminal device generates third data; the third data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer;

[0038] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third correspondence, including:

[0039] The second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence.

[0040] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer, which enables the second adaptation layer entity of the first terminal device to deliver the data correctly and improves the reliability of downlink data transmission.

[0041] Optionally, the method further includes:

[0042] The first adaptation layer entity of the first terminal device determines the identification information of the unicast connection on the side link based on the identifier of the second terminal device and the second correspondence.

[0043] The second correspondence includes the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0044] As can be seen, the above technical solution realizes the conversion between the identifier of the second terminal device and the identifier information of the unicast connection on the side link.

[0045] Optionally, the method further includes:

[0046] The first terminal device receives first configuration information from the access network device. The first configuration information includes one or more of the following: a first correspondence, a second correspondence, and a third correspondence. The first configuration information is used to indicate one or more of the following:

[0047] The first correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0048] The second correspondence is the configuration information of the first adapter layer and / or the second adapter layer of the first terminal device;

[0049] The third correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0050] The first correspondence is the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer. The second correspondence includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device. The third correspondence includes the correspondence between the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the identifier of the second RLC bearer.

[0051] As can be seen, in the above technical solution, the first terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0052] In a second aspect, a data transmission method is provided, the method being applied to a first terminal device, wherein the first terminal device uses a first radio link control (RLC) bearer when communicating with an access network device, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer being used to transmit data from the at least one terminal device, the method comprising:

[0053] The first adaptation layer entity of the first terminal device delivers the first data and the first indication information to the second adaptation layer entity of the first terminal device. The first indication information is used to indicate the wireless bearer corresponding to the second terminal device that transmits the first data. The second terminal device is a terminal device among the at least one terminal device.

[0054] The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first instruction information.

[0055] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the first RLC bearer according to the first instruction information, thereby improving the reliability of uplink data transmission.

[0056] Optionally, the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device; or,

[0057] The first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device.

[0058] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the correct RLC bearer.

[0059] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device, the method further includes:

[0060] The first adaptation layer entity of the first terminal device determines the identifier of the second terminal device based on the identifier information of the unicast connection on the side link and the first correspondence relationship; the side link is the side link that transmits the first data, and the first correspondence relationship is the correspondence between the identifier information of the unicast connection on the side link and the identifier of the second terminal device.

[0061] As can be seen, the above technical solution realizes the conversion between the identifier of the second terminal device and the identifier information of the unicast connection on the side link.

[0062] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device, the method further includes:

[0063] The second adaptation layer entity of the first terminal device determines the identifier of the second terminal device based on the identifier information of the unicast connection on the side link and the first correspondence relationship; the side link is the side link that transmits the first data, and the first correspondence relationship is the correspondence between the identifier information of the unicast connection on the side link and the identifier of the second terminal device.

[0064] It can be seen that the above technical solution realizes the conversion between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0065] Optionally, the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first indication information, including:

[0066] The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0067] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

[0068] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to deliver the data correctly and improving the reliability of uplink data transmission.

[0069] Optionally, the method further includes:

[0070] The second adaptation layer entity of the first terminal device generates second data; the second data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device;

[0071] The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including:

[0072] The second adaptation layer entity of the first terminal device delivers the second data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0073] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the second data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, so that the second adaptation layer entity of the first terminal device can deliver the data correctly, thereby improving the reliability of uplink data transmission.

[0074] Optionally, the method further includes:

[0075] The first terminal device receives first configuration information from the access network device; the first configuration information includes one or more of the following: a first correspondence relationship, a second correspondence relationship; the first configuration information is used to indicate one or more of the following:

[0076] The first correspondence is the configuration information of the first adaptation layer and / or the second adaptation layer of the first terminal device;

[0077] The second correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0078] The first correspondence is the correspondence between the identifier information of the unicast connection on the side link and the identifier of the second terminal device. The second correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0079] As can be seen, in the above technical solution, the first terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0080] Thirdly, a data transmission method is provided, the method being applied to a second terminal device, the method comprising:

[0081] The adaptation layer entity of the second terminal device receives second data from the radio link control (RLC) bearer of the second terminal device; the second data includes second indication information, which is used to indicate the radio bearer corresponding to the second terminal device receiving the second data.

[0082] The adaptation layer entity of the second terminal device delivers the second data to the Packet Data Convergence Protocol (PDCP) layer entity of the second terminal device according to the second instruction information.

[0083] As can be seen, in the above technical solution, the adaptation layer entity of the second terminal device receives the second data from the RLC bearer of the second terminal device, so that the adaptation layer entity of the second terminal device can correctly deliver the first data to the PDCP layer entity of the second terminal device according to the second instruction information, thereby improving the reliability of downlink data transmission.

[0084] Optionally, if the second indication information includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the second indication information, including:

[0085] The adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence;

[0086] The first correspondence includes the correspondence between the identifier of the wireless bearer and the identifier of the PDCP layer entity of the second terminal device.

[0087] As can be seen, in the above technical solution, the adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence, so that the adaptation layer entity of the second terminal device can correctly deliver the downlink data, thereby improving the reliability of downlink data transmission.

[0088] Fourthly, a data transmission method is provided, the method being applied to a second terminal device, the method comprising:

[0089] The adaptation layer entity of the second terminal device generates second data; the second data includes first data and second indication information, the first data is data received by the adaptation layer entity of the second terminal device from the Packet Data Convergence Protocol (PDCP) layer entity of the second terminal device, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device that receives the second data;

[0090] The adaptation layer entity of the second terminal device delivers the second data to the radio link control (RLC) bearer of the second terminal device according to the second instruction information.

[0091] As can be seen, in the above technical solution, the adapter layer entity of the second terminal device generates second data, which includes first data and second indication information. This enables the adapter layer entity of the second terminal device to correctly deliver the second data to the RLC bearer of the second terminal device according to the second indication information, thereby improving the reliability of uplink data transmission.

[0092] Optionally, if the second indication information includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the second indication information, including:

[0093] The adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer and the first correspondence;

[0094] The first correspondence includes the correspondence between the identifier of the wireless bearer and the identifier of the RLC bearer of the second terminal device.

[0095] As can be seen, in the above technical solution, the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer and the first correspondence, so that the adaptation layer entity of the second terminal device can correctly deliver the uplink data and improve the reliability of uplink data transmission.

[0096] Optionally, the method further includes:

[0097] The second terminal device receives first configuration information from the access network device. The first configuration information includes the following: a first correspondence and a second correspondence. The first configuration information is used to indicate that the first correspondence or the second correspondence is the configuration information of the adaptation layer of the second terminal device.

[0098] The first correspondence includes the correspondence between the identifier of the radio bearer and the identifier of the RLC bearer of the second terminal device;

[0099] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the RLC bearer of the second terminal device.

[0100] As can be seen, in the above technical solution, the second terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0101] Fifthly, a data transmission method is provided, the method being applied to an access network device, the method comprising:

[0102] The adaptation layer entity of the access network device generates second data; the second data includes first data and second indication information, the first data is data received by the adaptation layer entity of the access network device from the Packet Data Convergence Protocol (PDCP) layer entity of the access network device, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device that receives the second data.

[0103] The adaptation layer entity of the access network device delivers the second data to the Radio Link Control (RLC) bearer of the access network device according to the second instruction information.

[0104] As can be seen, in the above technical solution, the adaptation layer entity of the access network device generates second data, which includes first data and second indication information. This enables the adaptation layer entity of the access network device to correctly deliver the second data to the RLC bearer of the access network device according to the second indication information, thereby improving the reliability of downlink data transmission.

[0105] Optionally, the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device. The adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the second indication information, including:

[0106] The adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence;

[0107] The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the RLC bearer of the access network device.

[0108] As can be seen, in the above technical solution, the adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the adaptation layer entity of the access network terminal device can correctly deliver the downlink data, thereby improving the reliability of downlink data transmission.

[0109] Sixthly, a data transmission method is provided, the method being applied to an access network device, the method comprising:

[0110] The adaptation layer entity of the access network device receives second data from the radio link control (RLC) bearer of the access network device; the second data includes second indication information, which is used to indicate the radio bearer corresponding to the second terminal device receiving the second data.

[0111] The adaptation layer entity of the access network device delivers the second data to the packet data aggregation protocol (PDCP) layer entity of the access network device according to the second instruction information.

[0112] As can be seen, in the above technical solution, the adaptation layer entity of the access network device receives the second data from the RLC bearer of the access network device, which enables the adaptation layer entity of the access network device to correctly deliver the first data to the PDCP layer entity of the access network device according to the second instruction information, thereby improving the reliability of uplink data transmission.

[0113] Optionally, the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device. The adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the second indication information, including:

[0114] The adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0115] The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the PDCP layer entity of the access network device.

[0116] As can be seen, in the above technical solution, the adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the adaptation layer entity of the access network device can correctly deliver the uplink data and improve the reliability of uplink data transmission.

[0117] A seventh aspect provides a data transmission method applied to a first terminal device, wherein the first terminal device uses a first radio link control (RLC) bearer when communicating with an access network device, the first RLC bearer is used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer is used to transmit data from the at least one terminal device, the method comprising:

[0118] The first adaptation layer entity of the first terminal device delivers the first data and the second indication information to the second adaptation layer entity of the first terminal device according to the first indication information; the first indication information is used to indicate the second terminal device transmitting the first data, and the second indication information is used to indicate the wireless bearer, wherein the second terminal device is a terminal device among the at least one terminal device;

[0119] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the second instruction information; the second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

[0120] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the second instruction information to the second adapter layer entity of the first terminal device according to the first instruction information, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the second RLC bearer according to the second instruction information, thereby improving the reliability of uplink data transmission.

[0121] Optionally, the first indication information is the identifier of the second terminal device, and the first adaptation layer entity of the first terminal device delivers the first data and the second indication information to the second adaptation layer entity of the first terminal device according to the first indication information, including:

[0122] The first adapter layer entity of the first terminal device determines the second adapter layer entity of the first terminal device from multiple adapter layer entities based on the identifier of the second terminal device and the first correspondence relationship;

[0123] The first adapter layer entity of the first terminal device delivers the first data and the second instruction information to the second adapter layer entity of the first terminal device.

[0124] The first correspondence includes one or more of the following:

[0125] The correspondence between the identifier of the second terminal device and the identifier of the second adaptation layer entity of the first terminal device;

[0126] The correspondence between the identifier of the second terminal device and the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device;

[0127] The second adaptation layer entity of the first terminal device corresponds to the side link, or the second adaptation layer entity of the first terminal device corresponds to the second terminal device.

[0128] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device determines the second adapter layer entity of the first terminal device from multiple adapter layer entities based on the identifier of the second terminal device and the first correspondence relationship, so that the first adapter layer entity of the first terminal device can deliver the first data and the second instruction information to the second adapter layer entity of the first terminal device, thereby enabling the first adapter layer entity of the first terminal device to correctly deliver the downlink data.

[0129] Optionally, the second indication information includes the identifier of the radio bearer, and the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the second indication information, including:

[0130] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer and the second correspondence; the second correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0131] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver downlink data and improving the reliability of downlink data transmission.

[0132] Optionally, the second indication information further includes the identifier of the second terminal device. The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier and the second correspondence of the radio bearer, including:

[0133] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0134] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver downlink data and improving the reliability of downlink data transmission.

[0135] Optionally, the method further includes:

[0136] The second adaptation layer entity of the first terminal device generates second data; the second data includes the first data and third indication information; the third indication information includes the identifier of the radio bearer, or the third indication information includes the identifier of the radio bearer and the identifier of the second terminal device;

[0137] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including:

[0138] The second adaptation layer entity of the first terminal device delivers the second data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0139] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the second data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver downlink data and improving the reliability of downlink data transmission.

[0140] Optionally, the method further includes:

[0141] The first terminal device receives first configuration information from the access network device; the first configuration information includes one or more of the following: a first correspondence relationship and a second correspondence relationship;

[0142] The first configuration information is used to indicate one or more of the following:

[0143] The first correspondence is the configuration information of the first adaptation layer of the first terminal device;

[0144] The second correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0145] The first correspondence includes one or more of the following:

[0146] The correspondence between the identifier of the second terminal device and the identifier of the second adaptation layer entity of the first terminal device;

[0147] The correspondence between the identifier of the second terminal device and the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device, and the side link corresponds to the second adaptation layer entity;

[0148] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0149] As can be seen, in the above technical solution, the first terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0150] Eighthly, a data transmission method is provided, the method being applied to a first terminal device, wherein the first terminal device uses a first radio link control (RLC) bearer when communicating with an access network device, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer being used to transmit data from the at least one terminal device, the method comprising:

[0151] The first adaptation layer entity of the first terminal device delivers the first data and the first indication information to the second adaptation layer entity of the first terminal device; the first indication information is used to indicate the radio bearer, and the second terminal device is a terminal device among the at least one terminal device;

[0152] The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first instruction information.

[0153] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the first RLC bearer according to the first instruction information, thereby improving the reliability of uplink data transmission.

[0154] Optionally, the method further includes:

[0155] The first adapter layer entity of the first terminal device determines the identifier of the second terminal device based on the second indication information and the second correspondence.

[0156] The first adapter layer entity of the first terminal device delivers the identifier of the second terminal device to the second adapter layer entity of the first terminal device;

[0157] The second indication information includes one or more of the following: the identifier of the first adaptation layer entity, the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device;

[0158] The second correspondence includes one or more of the following:

[0159] The correspondence between the identifier of the first adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0160] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0161] As can be seen, in the above technical solution, when the first adapter layer entity of the first terminal device does not obtain the identifier of the second terminal device, the first adapter layer entity of the first terminal device determines the identifier of the second terminal device according to the second instruction information and the second correspondence, thereby realizing the conversion between the second instruction information and the identifier of the second terminal device.

[0162] Optionally, the method further includes:

[0163] The second adaptation layer entity of the first terminal device determines the identifier of the second terminal device based on the third indication information and the third correspondence relationship;

[0164] The third indication information includes one or more of the following: the identifier of the second adaptation layer entity, the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device, and the side link corresponds to the first adaptation layer entity;

[0165] The third correspondence includes one or more of the following:

[0166] The correspondence between the identifier of the second adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0167] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0168] As can be seen, in the above technical solution, when the first adapter layer entity of the first terminal device does not hand over the identifier of the second terminal device to the second adapter layer entity of the first terminal device, the second adapter layer entity of the first terminal device determines the identifier of the second terminal device according to the second instruction information and the third correspondence, thereby realizing the conversion between the second instruction information and the identifier of the second terminal device.

[0169] Optionally, the first indication information includes the identifier of the radio bearer, and the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first indication information, including:

[0170] The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence.

[0171] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

[0172] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, thereby enabling the second adaptation layer entity of the first terminal device to deliver the data correctly and improving the reliability of uplink data transmission.

[0173] Optionally, the method further includes:

[0174] The second adaptation layer entity of the first terminal device generates second data; the second data includes the first data, the identifier of the radio bearer and the identifier of the second terminal device, or the second data includes the first data and the identifier of the radio bearer;

[0175] The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including:

[0176] The second adaptation layer entity of the first terminal device delivers the second data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence.

[0177] As can be seen, in the above technical solution, the second adaptation layer entity of the first terminal device delivers the second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the second adaptation layer entity of the first terminal device can deliver the data correctly, thereby improving the reliability of uplink data transmission.

[0178] Optionally, the method further includes:

[0179] The first terminal device receives second configuration information from the access network device; the second configuration information includes one or more of the following: a first correspondence, a second correspondence, and a third correspondence.

[0180] The second configuration information is used to indicate one or more of the following:

[0181] The first correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0182] The second correspondence is the configuration information of the first adaptation layer of the first terminal device;

[0183] The third correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0184] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer;

[0185] The second correspondence includes one or more of the following:

[0186] The correspondence between the identifier of the first adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0187] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device;

[0188] The third correspondence includes one or more of the following:

[0189] The correspondence between the identifier of the second adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0190] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0191] As can be seen, in the above technical solution, the first terminal device receives the second configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the second configuration information, thereby improving the reliability of data transmission.

[0192] A ninth aspect provides a communication device, the communication device being a first terminal device, wherein the first terminal device communicates with an access network device using a first radio link control (RLC) bearer, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer being used to transmit data from the at least one terminal device, the first terminal device including a transceiver module.

[0193] The transceiver module is used to deliver first data and first indication information to a second adaptation layer entity of the first terminal device through a first adaptation layer entity of the first terminal device. The first indication information is used to indicate the wireless bearer corresponding to the second terminal device that transmits the first data. The second terminal device is a terminal device among the at least one terminal device.

[0194] The transceiver module is used to deliver the first data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the first instruction information. The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

[0195] Optionally, the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device; or,

[0196] The first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device.

[0197] Optionally, when the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first indication information, the transceiver module is used to deliver the first data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence relationship;

[0198] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0199] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device, the first terminal device further includes a processing module. The processing module is configured to determine a sidelink based on the identifier of the second terminal device and a first correspondence relationship through the second adaptation layer entity of the first terminal device. The sidelink is a sidelink between the first terminal device and the second terminal device, and at least one RLC bearer corresponds to the sidelink. The first correspondence relationship includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device.

[0200] When the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, the processing module is used to deliver the first data to the second RLC bearer among the at least one RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0201] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink, wherein the sidelink is a sidelink between the first terminal device and the second terminal device, and the sidelink corresponds to at least one RLC bearer, when the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, the transceiver module is used to deliver the first data to the second RLC bearer among the at least one RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence.

[0202] Optionally, the first indication information may also include the identifier of the second terminal device.

[0203] Optionally, the first terminal device further includes a processing module, which is configured to generate second data through the second adaptation layer entity of the first terminal device; the second data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer, or the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device;

[0204] When the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer among the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, the transceiver module is used to deliver the second data to the second RLC bearer among the at least one RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0205] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device, when the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first indication information, the transceiver module is used to deliver the first data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the unicast connection on the sidelink, and the third correspondence;

[0206] The third correspondence includes the correspondence between the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the identifier of the second RLC bearer.

[0207] Optionally, the first terminal device further includes a processing module, which is configured to generate third data through the second adaptation layer entity of the first terminal device; the third data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer;

[0208] The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third correspondence, including:

[0209] The second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence.

[0210] Optionally, the first terminal device further includes a processing module, which is further configured to determine the identification information of the unicast connection on the side link based on the identification of the second terminal device and the second correspondence relationship through the first adaptation layer entity of the first terminal device;

[0211] The second correspondence includes the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0212] Optionally, the transceiver module is further configured to receive first configuration information from the access network device, the first configuration information including one or more of the following: a first correspondence, a second correspondence, and a third correspondence, the first configuration information being used to indicate one or more of the following:

[0213] The first correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0214] The second correspondence is the configuration information of the first adapter layer and / or the second adapter layer of the first terminal device;

[0215] The third correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0216] The first correspondence is the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer. The second correspondence includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device. The third correspondence includes the correspondence between the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the identifier of the second RLC bearer.

[0217] In a tenth aspect, a communication device is provided, the communication device being a first terminal device, wherein the first terminal device uses a first radio link control (RLC) bearer when communicating with an access network device, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer being used to transmit data from the at least one terminal device, the first terminal device including a transceiver module.

[0218] The transceiver module is used to deliver first data and first indication information to a second adaptation layer entity of the first terminal device through a first adaptation layer entity of the first terminal device. The first indication information is used to indicate the wireless bearer corresponding to the second terminal device that transmits the first data. The second terminal device is a terminal device among the at least one terminal device.

[0219] The transceiver module is used to deliver the first data to the first RLC bearer through the second adaptation layer entity of the first terminal device according to the first instruction information.

[0220] Optionally, the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device; or,

[0221] The first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device.

[0222] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device, the first terminal device further includes a processing module. The processing module is used to determine the identifier of the second terminal device through a first adaptation layer entity of the first terminal device based on the identifier information of the unicast connection on the sidelink and a first correspondence relationship; the sidelink is the sidelink that transmits the first data, and the first correspondence relationship is the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device.

[0223] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, the sidelink is the sidelink between the first terminal device and the second terminal device, and the first terminal device further includes a processing module, the processing module being used to determine the identifier of the second terminal device through the second adaptation layer entity of the first terminal device based on the identifier of the unicast connection on the sidelink and a first correspondence relationship; the sidelink is the sidelink for transmitting the first data, and the first correspondence relationship is the correspondence between the identifier of the unicast connection on the sidelink and the identifier of the second terminal device.

[0224] Optionally, when the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first indication information, the transceiver module is used to deliver the first data to the first RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0225] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

[0226] Optionally, the processing module is further configured to generate second data through the second adaptation layer entity of the first terminal device; the second data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device;

[0227] When the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, the transceiver module is used to deliver the second data to the first RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0228] Optionally, the transceiver module is further configured to receive first configuration information from the access network device; the first configuration information includes one or more of the following: a first correspondence relationship, a second correspondence relationship; the first configuration information is used to indicate one or more of the following:

[0229] The first correspondence is the configuration information of the first adaptation layer and / or the second adaptation layer of the first terminal device;

[0230] The second correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0231] The first correspondence is the correspondence between the identifier information of the unicast connection on the side link and the identifier of the second terminal device. The second correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0232] Eleventhly, a communication device is provided, the communication device being a second terminal device, the second terminal device including a transceiver module.

[0233] The transceiver module is configured to receive second data from the Radio Link Control (RLC) bearer of the second terminal device through the adaptation layer entity of the second terminal device; the second data includes second indication information, which is used to indicate the radio bearer corresponding to the second terminal device receiving the second data.

[0234] The transceiver module is used to deliver the second data to the Packet Data Convergence Protocol (PDCP) layer entity of the second terminal device according to the second instruction information through the adaptation layer entity of the second terminal device.

[0235] Optionally, if the second indication information includes the identifier of the radio bearer, when the adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the second indication information, the transceiver module is used to deliver the second data to the PDCP layer entity of the second terminal device through the adaptation layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence relationship.

[0236] The first correspondence includes the correspondence between the identifier of the wireless bearer and the identifier of the PDCP layer entity of the second terminal device.

[0237] In a twelfth aspect, a communication device is provided, the communication device being a second terminal device, the second terminal device including a transceiver module and a processing module.

[0238] The processing module is used to generate second data through the adaptation layer entity of the second terminal device; the second data includes first data and second indication information, the first data is data received by the adaptation layer entity of the second terminal device from the Packet Data Convergence Protocol (PDCP) layer entity of the second terminal device, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device that receives the second data.

[0239] The transceiver module is used to deliver the second data to the Radio Link Control (RLC) bearer of the second terminal device through the adaptation layer entity of the second terminal device according to the second instruction information.

[0240] Optionally, if the second indication information includes the identifier of the radio bearer, when the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the second indication information, the transceiver module is used to deliver the second data to the RLC bearer of the second terminal device through the adaptation layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence relationship;

[0241] The first correspondence includes the correspondence between the identifier of the wireless bearer and the identifier of the RLC bearer of the second terminal device.

[0242] Optionally, the transceiver module is further configured to receive first configuration information from the access network device, the first configuration information including one of the following: a first correspondence relationship and a second correspondence relationship, the first configuration information being used to indicate that the first correspondence relationship or the second correspondence relationship is the configuration information of the adaptation layer of the second terminal device;

[0243] The first correspondence includes the correspondence between the identifier of the radio bearer and the identifier of the RLC bearer of the second terminal device;

[0244] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the RLC bearer of the second terminal device.

[0245] In a thirteenth aspect, a communication device is provided, the communication device being an access network device, the access network device including a transceiver module and a processing module.

[0246] The processing module is used to generate second data through the adaptation layer entity of the access network device; the second data includes first data and second indication information, the first data is data received by the adaptation layer entity of the access network device from the Packet Data Convergence Protocol (PDCP) layer entity of the access network device, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device receiving the second data.

[0247] The transceiver module is used to deliver the second data to the Radio Link Control (RLC) bearer of the access network device through the adaptation layer entity of the access network device according to the second instruction information. The RLC bearer of the access network device is the RLC bearer used when the access network device communicates with the first terminal device.

[0248] Optionally, the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device. When the adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the second indication information, the transceiver module is used to deliver the second data to the RLC bearer of the access network device through the adaptation layer entity of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0249] The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the RLC bearer of the access network device.

[0250] In a fourteenth aspect, a communication device is provided, the communication device being an access network device, the access network device including a transceiver module.

[0251] The transceiver module is used to receive second data from the Radio Link Control (RLC) bearer of the access network device through the adaptation layer entity of the access network device; the RLC bearer of the access network device is the RLC bearer used when the access network device communicates with the first terminal device; the second data includes second indication information, which is used to indicate the radio bearer corresponding to the second terminal device receiving the second data.

[0252] The transceiver module is used to deliver the second data to the Packet Data Convergence Protocol (PDCP) layer entity of the access network device according to the second instruction information through the adaptation layer entity of the access network device.

[0253] Optionally, the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device. When the adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the second indication information, the transceiver module is used to deliver the second data to the PDCP layer entity of the access network device through the adaptation layer entity of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0254] The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the PDCP layer entity of the access network device.

[0255] In a fifteenth aspect, a communication apparatus is provided, the communication apparatus being a first terminal device, wherein the first terminal device communicates with an access network device using a first radio link control (RLC) bearer, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer being used to transmit data from the at least one terminal device, the first terminal device including a transceiver module.

[0256] The transceiver module is used to deliver first data and second indication information to the second adaptation layer entity of the first terminal device according to the first indication information through the first adaptation layer entity of the first terminal device; the first indication information is used to indicate the second terminal device transmitting the first data, the second indication information is used to indicate the wireless bearer, and the second terminal device is a terminal device among the at least one terminal device.

[0257] The transceiver module is used to deliver the first data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the second instruction information; the second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

[0258] Optionally, the first terminal device further includes a processing module. The first indication information is the identifier of the second terminal device. When the first adaptation layer entity of the first terminal device delivers the first data and the second indication information to the second adaptation layer entity of the first terminal device according to the first indication information, the processing module is used to determine the second adaptation layer entity of the first terminal device from multiple adaptation layer entities based on the identifier of the second terminal device and the first correspondence relationship through the first adaptation layer entity of the first terminal device.

[0259] The transceiver module is further configured to deliver the first data and the second instruction information to the second adaptation layer entity of the first terminal device through the first adaptation layer entity of the first terminal device.

[0260] The first correspondence includes one or more of the following:

[0261] The correspondence between the identifier of the second terminal device and the identifier of the second adaptation layer entity of the first terminal device;

[0262] The correspondence between the identifier of the second terminal device and the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device;

[0263] The second adaptation layer entity of the first terminal device corresponds to the side link, or the second adaptation layer entity of the first terminal device corresponds to the second terminal device.

[0264] Optionally, the second indication information includes the identifier of the radio bearer. When the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the second indication information, the transceiver module is used to deliver the first data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer and the second correspondence relationship; the second correspondence relationship includes the correspondence relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the second RLC bearer.

[0265] Optionally, the second indication information also includes the identifier of the second terminal device. When the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer and the second correspondence, the transceiver module is used to deliver the first data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the second correspondence.

[0266] Optionally, the first terminal device further includes a processing module, which is configured to generate second data through a second adaptation layer entity of the first terminal device; the second data includes the first data and third indication information; the third indication information includes the identifier of the radio bearer, or the third indication information includes the identifier of the radio bearer and the identifier of the second terminal device;

[0267] When the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the second correspondence, the transceiver module is used to deliver the second data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the second correspondence.

[0268] Optionally, the transceiver module is further configured to receive first configuration information from the access network device; the first configuration information includes one or more of the following: a first correspondence relationship and a second correspondence relationship;

[0269] The first configuration information is used to indicate one or more of the following:

[0270] The first correspondence is the configuration information of the first adaptation layer of the first terminal device;

[0271] The second correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0272] The first correspondence includes one or more of the following:

[0273] The correspondence between the identifier of the second terminal device and the identifier of the second adaptation layer entity of the first terminal device;

[0274] The correspondence between the identifier of the second terminal device and the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device, and the side link corresponds to the second adaptation layer entity;

[0275] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0276] In a sixteenth aspect, a communication apparatus is provided, the communication apparatus being a first terminal device, wherein the first terminal device communicates with an access network device using a first radio link control (RLC) bearer, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer being used to transmit data from the at least one terminal device, the first terminal device including a transceiver module, the transceiver module being used to deliver first data and first indication information to a second adaptation layer entity of the first terminal device through a first adaptation layer entity of the first terminal device; the first indication information being used to indicate a radio bearer, the second terminal device being a terminal device among the at least one terminal device; the second adaptation layer entity of the first terminal device delivering the first data to the first RLC bearer according to the first indication information.

[0277] Optionally, the first terminal device further includes a processing module, which is used to determine the identifier of the second terminal device through the first adaptation layer entity of the first terminal device based on the second indication information and the second correspondence.

[0278] The transceiver module is used to deliver the identifier of the second terminal device to the second adaptation layer entity of the first terminal device through the first adaptation layer entity of the first terminal device.

[0279] The second indication information includes one or more of the following: the identifier of the first adaptation layer entity, the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device;

[0280] The second correspondence includes one or more of the following:

[0281] The correspondence between the identifier of the first adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0282] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0283] Optionally, the first terminal device further includes a processing module, which is used to determine the identifier of the second terminal device through the second adaptation layer entity of the first terminal device based on the third indication information and the third correspondence relationship;

[0284] The third indication information includes one or more of the following: the identifier of the second adaptation layer entity, the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device, and the side link corresponds to the first adaptation layer entity;

[0285] The third correspondence includes one or more of the following:

[0286] The correspondence between the identifier of the second adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0287] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0288] Optionally, the first indication information includes the identifier of the radio bearer. When the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first indication information, the transceiver module is used to deliver the first data to the first RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0289] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

[0290] Optionally, the processing module is further configured to generate second data through the second adaptation layer entity of the first terminal device; the second data includes the first data, the identifier of the radio bearer and the identifier of the second terminal device, or the second data includes the first data and the identifier of the radio bearer;

[0291] When the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, the transceiver module is used to deliver the second data to the first RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

[0292] Optionally, the transceiver module is configured to receive second configuration information from the access network device; the second configuration information includes one or more of the following: a first correspondence, a second correspondence, and a third correspondence.

[0293] The second configuration information is used to indicate one or more of the following:

[0294] The first correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0295] The second correspondence is the configuration information of the first adaptation layer of the first terminal device;

[0296] The third correspondence is the configuration information of the second adaptation layer of the first terminal device;

[0297] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer;

[0298] The second correspondence includes one or more of the following:

[0299] The correspondence between the identifier of the first adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0300] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device;

[0301] The third correspondence includes one or more of the following:

[0302] The correspondence between the identifier of the second adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0303] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0304] In a seventeenth aspect, a communication device is provided, comprising a processor and a memory, wherein the processor invokes a computer program stored in the memory to implement the method described in any one of the first, second, third, fourth, fifth, sixth, seventh, or eighth aspects.

[0305] In one possible design, the communication device may be a chip or a device containing a chip that implements the methods of the first, second, third, fourth, fifth, sixth, seventh or eighth aspects.

[0306] Eighteenth aspect: A computer-readable storage medium storing a computer program that, when executed, implements the method described in any one of the first, second, third, fourth, fifth, sixth, seventh, or eighth aspects.

[0307] Nineteenth aspect, a computer program product containing instructions is provided, which, when executed on a computer, causes the methods described in any one of the first, second, third, fourth, fifth, sixth, seventh, or eighth aspects to be performed.

[0308] In a twentieth aspect, a communication system is provided, comprising one or more of the following: the first terminal device, the second terminal device, and the access network device described above. Attached Figure Description

[0309] The accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below.

[0310] in:

[0311] Figure 1 This refers to the control plane protocol stack involved in communication between terminal devices.

[0312] Figure 2 The data plane protocol architecture for U2N Relay;

[0313] Figure 3 The basic architecture of the communication system provided in the embodiments of this application;

[0314] Figure 4 The diagram shown is a hardware structure schematic of a communication device applicable to the embodiments of this application;

[0315] Figure 5A A flowchart illustrating a data transmission method provided in an embodiment of this application;

[0316] Figure 5B A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0317] Figure 6A A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0318] Figure 6B A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0319] Figure 7A A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0320] Figure 7B A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0321] Figure 8A A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0322] Figure 8B A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0323] Figure 9 A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0324] Figure 10 A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0325] Figure 11 A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0326] Figure 12 A flowchart illustrating another data transmission method provided in an embodiment of this application;

[0327] Figure 13A A schematic diagram illustrating the transmission of downlink data from the access network device to the second terminal device via the first terminal device and the transmission of uplink data from the second terminal device to the access network device via the first terminal device.

[0328] Figure 13B A schematic diagram illustrating the transmission of downlink data from the access network device to the second terminal device via the first terminal device and the transmission of uplink data from the second terminal device to the access network device via the first terminal device.

[0329] Figure 14 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0330] Figure 15 A simplified structural diagram of a terminal device provided for an embodiment of this application;

[0331] Figure 16 This is a simplified structural diagram of an access network device provided in an embodiment of this application. Detailed Implementation

[0332] The technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings. The terms "system" and "network" in the embodiments of this application can be used interchangeably. Unless otherwise stated, " / " indicates that the objects before and after are in an "or" relationship; for example, A / B can represent A or B. "And / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone, where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be one or multiple. Furthermore, to facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish between network elements and similar items with essentially the same function. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" are not necessarily different.

[0333] References to "one embodiment" or "some embodiments" in the embodiments described in this application mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0334] The following detailed embodiments further illustrate the objectives, technical solutions, and beneficial effects of this application. It should be understood that the following are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made based on the technical solutions of this application should be included within the scope of protection of this application.

[0335] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0336] The following provides explanations of some of the terms (or communication terms) used in this application. It is understood that when these terms (or communication terms) are used elsewhere in this application, they will not be explained further.

[0337] 1. Sidelink (SL)

[0338] SL refers to the link defined for direct communication between terminal devices. That is, the link between terminal devices that allows direct communication without going through a base station.

[0339] The interface between terminal devices is called the PC5 interface, which is similar to the Uu interface between a terminal device and an access network device. Understandably, the control plane protocol stack involved in communication between terminal devices can be found in [reference needed]. Figure 1 ,like Figure 1 As shown, in the control plane, terminal device A and terminal device B can have peer-to-peer radio resource control (RRC) layer, packet data convergence protocol (PDCP) layer, radio link control (RLC) layer, media access control (MAC) layer, physical (PHY) layer, etc.

[0340] In addition, the communication types supported on SL can include broadcast, multicast, and unicast communication. In Long Term Evolution (LTE) systems, SL supports broadcast communication. In New Radio (NR) systems, SL supports broadcast, multicast, and unicast communication.

[0341] Broadcast communication is similar to the broadcast system information of access network equipment. That is, the terminal device sends broadcast service data to the outside world without encryption. Any other terminal device within the effective reception range can receive the broadcast service data if it is interested in the broadcast service.

[0342] Multicast communication refers to communication between all terminals within a communication group, where any terminal device within the group can send and receive data for the multicast service.

[0343] Unicast communication is similar to data communication between a terminal device and an access network device after establishing a radio resource control (RRC) connection. It requires a prior unicast connection between the two terminal devices. After establishing the unicast connection, the two terminal devices can communicate data based on negotiated identifiers; this data can be encrypted or unencrypted. Unlike broadcast communication, unicast communication can only occur between two terminal devices that have established a unicast connection. Unicast communication corresponds to a pair of source Layer-2 identifiers (L2 IDs) and destination Layer-2 identifiers (L2 IDs). For example, each SL MAC protocol data unit (PDU) header contains source and destination Layer-2 identifiers to ensure data is transmitted to the correct receiver.

[0344] 2. Radio bearer (RB)

[0345] RB (Radio Bearer) is a collective term for a series of protocol entities and configurations allocated by access network equipment to terminal equipment. It is a service provided by Layer 2 for transmitting user data between access network equipment and terminal equipment, including PDCP layer entities and a series of resource configurations. RBs can be divided into data radio bearers (DRBs) and signaling radio bearers (SRBs). The former carries data, and the latter carries signaling messages. In SL (Signal Link) communication scenarios, RBs are called sidelink radio bearers (SL RBs), which can be further divided into sidelink data radio bearers (SL DRBs) and sidelink signaling radio bearers (SL SRBs).

[0346] 3. RLC Bearer

[0347] RLC bearer refers to the protocol entities and configurations below the RLC layer. It is the lower layer of the radio bearer and includes a series of resources such as RLC layer entities and logical channels.

[0348] In this application, RLC bearers can be divided into RLC bearers used when the terminal device communicates with the access network device, and RLC bearers used when the terminal device communicates with each other. It is understood that the RLC bearer used when the terminal device communicates with the access network device can be called a Uu RLC bearer, and the RLC bearer used when the terminal device communicates with each other can be called a PC5 RLC bearer. In other words, the Uu RLC bearer is an RLC bearer on a Uu link or Uu interface, and the PC5 RLC bearer is an RLC bearer on an SL or PC5 interface. A Uu link is the link between the terminal device and the access network device. It is understood that Uu RLC bearer and PC5 RLC bearer are names, used in this application as descriptive examples, and not as limiting the names.

[0349] 4. Protocol stack in a UE-to-Network relay (U2N Relay) system

[0350] U2N Relay is a technology that enables one terminal device to communicate with another terminal device and access network equipment. U2N Relay can also be called relay technology.

[0351] The protocol architecture of U2N Relay can be found in [reference needed]. Figure 2 ,like Figure 2 As shown, the U2N Relay protocol stack has two types: L3 relay and L2 relay. This application only describes L2 relay. Data packets from the remote UE are relayed below the RLC layer of the relay UE; that is, the relay UE only maintains the relay's RLC bearer. Therefore, there are end-to-end PDCP, Service Data Adaptation Protocol (SDAP), and RRC layers between the remote UE and the access network equipment, but no end-to-end RLC, MAC, and PHY layers.

[0352] Furthermore, the U2N Relay protocol architecture adds an adaptation layer between the RLC layer and the PDCP layer. This adaptation layer can be divided into the adaptation layer used when the terminal device communicates with the access network device, and the adaptation layer used when the terminal device communicates with itself. Understandably, in this application, the adaptation layer used when the terminal device communicates with the access network device can be called the Uu adaptation layer, and the adaptation layer used when the terminal device communicates with itself can be called the PC5 adaptation layer. In other words, the adaptation layer in the protocol stack at both ends of the PC5 interface can be called the PC5 adaptation layer, that is, the adaptation layer in the protocol stack at both ends of the SL interface can be called the PC5 adaptation layer. The adaptation layer in the protocol stack at both ends of the Uu interface can be called the Uu adaptation layer.

[0353] It should be noted that the main function of the adaptation layer is bearer multiplexing and demultiplexing, that is, supporting the multiplexing of data from different radio bearers onto a single RLC bearer or splitting data from a single RLC bearer across different radio bearers. For example, in the downlink direction, the adaptation layer of the access network device can multiplex data from at least one radio bearer corresponding to each of at least one remote terminal device into the same RLC bearer. In other words, one RLC bearer on the Uu link can contain data from at least one radio bearer corresponding to each of at least one remote terminal device. On the SL of each remote terminal device, data from at least one radio bearer of that remote terminal device can be mapped to the same PC5 RLC bearer. Similarly, in the uplink direction, the adaptation layer of the remote terminal device can map data from multiple radio bearers of the remote terminal device to the same PC5 RLC bearer. The adaptation layer of the relay terminal device can multiplex data from at least one radio bearer corresponding to each of at least one remote terminal device into the same Uu link RLC bearer.

[0354] 5. Service Data Unit (SDU) and Protocol Data Unit (PDU)

[0355] In a communication network, the data unit exchanged between peer protocol layer entities of different devices is called a PDU. A protocol layer passes its PDU to the lower protocol layer through the service access point (SAP) (also known as the service interface) provided by the adjacent lower protocol layer, and the lower protocol layer indirectly completes the exchange of its PDU. The PDU of the lower protocol layer serves as the SDU of the lower protocol layer.

[0356] For example, for a specific protocol layer, if the data received by that protocol layer does not include its protocol layer header, then that data can be considered an SDU (Simplified Data Unit) of that protocol layer. If the data received by that protocol layer includes its protocol layer header, then that data can be considered a PDU (Programmable Data Unit) of that protocol layer. For instance, for an adaptation layer, if the data received by that adaptation layer does not include its adaptation layer header, then that data packet can be considered an SDU of that adaptation layer; if the data received by that adaptation layer includes its adaptation layer header, then that data packet can be considered a PDU of that adaptation layer.

[0357] It should be understood that the technical solutions of the embodiments of this application can be applied to long-term evolution (LTE) architecture, 5th generation mobile networks (5G), wireless local area networks (WLAN) systems, etc. The technical solutions of the embodiments of this application can also be applied to other future communication systems, such as 6G communication systems. In future communication systems, the functions may remain the same, but the names may change.

[0358] Furthermore, the technical solutions of this application embodiment can also be applied to fields such as device-to-device (D2D) devices, vehicle-to-everything (V2X) devices, unmanned driving, automated driving (ADS), driver assistance (ADAS), intelligent driving, connected driving, intelligent network driving, and car sharing.

[0359] The basic architecture of the communication system provided in the embodiments of this application is described below. See also Figure 3 , Figure 3 The basic architecture of the communication system provided in the embodiments of this application. For example... Figure 3 As shown, the communication system may include a first terminal device 10 and at least one second terminal device 20 that performs SL communication with the first terminal device 10. Figure 3 (Only one is shown in the image) and the access network device 30 that communicates with the first terminal device 10. Figure 3 This is merely an illustrative diagram and does not constitute a limitation on the applicable scenarios of the technical solutions provided in this application.

[0360] The first terminal device 10 and the second terminal device 20 are user-side entities used to receive signals, or transmit signals, or both. The first terminal device 10 and the second terminal device 20 are used to provide users with one or more of voice services and data connectivity services. The first terminal device 10 and the second terminal device 20 can be devices that include wireless transceiver functions and can cooperate with access network equipment to provide communication services to users. Specifically, the first terminal device 10 and the second terminal device 20 can refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, terminal, wireless communication equipment, user agent, user apparatus, or roadside unit (RSU). The first terminal device 10 and the second terminal device 20 can also be drones, Internet of Things (IoT) devices, stations (ST) in WLANs, cellular phones, smartphones, cordless phones, wireless data cards, tablets, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistant (PDA) devices, laptop computers, machine type communication (MTC) terminals, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices (also known as wearable smart devices), virtual reality (VR) terminals, augmented reality (AR) terminals, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical care, wireless terminals in smart grids, and transportation security devices. Wireless terminals in smart cities, smart homes, etc., can be used for various purposes. The first terminal device 10 and the second terminal device 20 can also be device-to-device (D2D) devices, such as electricity meters and water meters.The first terminal device 10 and the second terminal device 20 can also be terminals in a 5G system or terminals in a next-generation communication system. This application embodiment does not limit them in this way.

[0361] It is understandable that the first terminal device 10 can also perform SL communication with terminal devices other than the second terminal device 20, and the second terminal device 20 can also perform SL communication with terminal devices other than the first terminal device 10, without any restrictions.

[0362] In this application, the first terminal device 10 and the second terminal device 20 may be located within the coverage area of ​​the same access network device; or, the first terminal device 10 and the second terminal device 20 may be located within the coverage area of ​​different access network devices; or, the first terminal device 10 may be located within the coverage area of ​​access network device 30, while the second terminal device 20 may be located outside the coverage area of ​​access network device 30. No restrictions are imposed here. It is understood that the first terminal device 10 is a relay terminal device, and the second terminal device 20 is a remote terminal device.

[0363] The access network device 30 is a network-side entity used to transmit signals, receive signals, or both. The access network device 30 can be a device deployed in a radio access network (RAN) to provide wireless communication functions for the first terminal device 10 and the second terminal device 20. For example, it can be a transmission reception point (TRP), a base station, or various forms of control nodes. Examples include network controllers, wireless controllers, and wireless controllers in cloud radio access network (CRAN) scenarios. Specifically, access network equipment can be various forms of macro base stations, micro base stations (also known as small stations), relay stations, access points (APs), radio network controllers (RNCs), node Bs (NBs), base station controllers (BSCs), base transceiver stations (BTSs), home base stations (e.g., home evolved node Bs, or home node Bs (HNBs)), baseband units (BBUs), transmitting and receiving points (TRPs), transmitting points (TPs), mobile switching centers, etc., or it can be the antenna panels of base stations. Control nodes can connect to multiple base stations and configure resources for multiple terminals covered by multiple base stations. In systems employing different wireless access technologies, the names of equipment with base station functions may vary. For example, it could be an evolved Node B (eNB or eNodeB) in an LTE system, a radio controller in a cloud radio access network (CRAN) scenario, a gNB in ​​5G, or the access network device 30 could be a relay station, access point, vehicle-mounted equipment, wearable device, or network-side equipment in networks after 5G, or access network equipment in future evolved PLMN networks, etc. This application does not limit the specific name of the access network device.

[0364] It should be noted that the technical solutions provided in this application are applicable to various system architectures. The network architectures and business scenarios described in this application are for the purpose of more clearly illustrating the technical solutions of this application and do not constitute a limitation on the technical solutions provided in this application. As those skilled in the art will know, with the evolution of network architectures and the emergence of new business scenarios, the technical solutions provided in this application are also applicable to similar technical problems.

[0365] Optional, Figure 3 Each device in the system (e.g., the first terminal device 10, the second terminal device 20, the access network device 30, etc.) can be implemented by a single device, or by multiple devices working together, or it can be a functional module within a single device. This application embodiment does not specifically limit this. It is understood that the aforementioned functions can be network elements within hardware devices, software functions running on dedicated hardware, or virtualization functions instantiated on a platform (e.g., a cloud platform).

[0366] For example, Figure 3 Each device in the system can be accessed via Figure 4 This is achieved through the communication device 400. Figure 4 The diagram shows a hardware structure applicable to the communication device provided in the embodiments of this application. The communication device 400 includes at least one processor 401, a communication line 402, a memory 403, and at least one communication interface 404.

[0367] The processor 401 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits used to control the execution of the program of the present application.

[0368] Communication line 402 may include a path for transmitting information between the aforementioned components.

[0369] Communication interface 404 is used by any transceiver device (such as an antenna) to communicate with other devices or communication networks, such as Ethernet, RAN, wireless local area networks (WLAN), etc.

[0370] The memory 403 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or it may be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto. The memory may exist independently and be connected to the processor via communication line 402. The memory may also be integrated with the processor. The memory provided in the embodiments of this application may generally be non-volatile.

[0371] The memory 403 stores computer execution instructions for implementing the scheme of this application, and the processor 401 controls the execution. The processor 401 executes the computer execution instructions stored in the memory 403 to implement the method provided in the following embodiments of this application.

[0372] Optionally, the computer execution instructions in the embodiments of this application may also be referred to as application code, and the embodiments of this application do not specifically limit this.

[0373] In one possible implementation, processor 401 may include one or more CPUs, for example... Figure 4 CPU0 and CPU1 in the CPU.

[0374] In one possible implementation, the communication device 400 may include multiple processors, such as... Figure 4 Processors 401 and 407 are described herein. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor here may refer to one or more devices, circuits, and / or processing cores used to process data (e.g., computer program instructions).

[0375] In one possible implementation, the communication device 400 may further include an output device 405 and an input device 406. The output device 405 communicates with the processor 401 and can display information in various ways. For example, the output device 405 may be a liquid crystal display (LCD), a light-emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc. The input device 406 communicates with the processor 401 and can receive user input in various ways. For example, the input device 406 may be a mouse, keyboard, touchscreen device, or sensing device, etc.

[0376] The aforementioned communication device 400 can be a general-purpose device or a dedicated device. In specific implementations, the communication device 400 can be a desktop computer, laptop computer, network server, PDA (personal digital assistant), mobile phone, tablet computer, wireless terminal device, embedded device, or other similar device. Figure 4 Devices with similar structures. This application does not limit the type of communication device 400 to any particular embodiment.

[0377] The embodiments of this application are described below with reference to the accompanying drawings. Optionally, in this application, when the first terminal device communicates with the access network device, a first RLC bearer is used. The first RLC bearer is used to transmit data corresponding to at least one terminal device from the access network device and / or the first RLC bearer is used to transmit data from at least one terminal device. That is, the first RLC bearer is the Uu RLC bearer used when the first terminal device and the access network device communicate. In addition, the first RLC bearer being used to transmit data corresponding to at least one terminal device from the access network device can be understood as one or more of the following: the data on the first RLC bearer comes from the data corresponding to at least one terminal device on the Uu RLC bearer of the access network device. Similarly, the first RLC bearer being used to transmit data from at least one terminal device can be understood as: the data on the first RLC bearer comes from the data on different PC5 RLC bearers of at least one terminal device. Wherein, the second terminal device is a terminal device among the at least one terminal device. It should be noted that when the first RLC bearer is mentioned elsewhere in this application, it will not be explained further thereafter.

[0378] First, combine Figure 5A and Figure 5B This explains how to correctly deliver downlink data when the first terminal device is configured with only one PC5 adapter layer entity, and this PC5 adapter layer entity is a shared adapter layer entity for at least one remote terminal device's PC5 RLC bearer.

[0379] See Figure 5A and Figure 5B , Figure 5A This application provides a flowchart illustrating a data transmission method. Figure 5B This is a flowchart illustrating another data transmission method provided in an embodiment of this application. Figure 5A and Figure 5B As shown, the method includes, but is not limited to, the following steps:

[0380] 501. The first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device.

[0381] Correspondingly, the second adaptation layer entity of the first terminal device receives the first data and the first instruction information from the first adaptation layer entity of the first terminal device.

[0382] Optionally, the first indication information is used to indicate the wireless bearer corresponding to the second terminal device transmitting the first data. Wherein, in Figure 5A and Figure 5B In this context, the first indication information is used to indicate the wireless bearer corresponding to the second terminal device that transmits the first data. This can be understood as: the first indication information is used to indicate the wireless bearer corresponding to the second terminal device that receives the first data.

[0383] Optionally, the first instruction information can be implemented in any of the following ways, without any restrictions.

[0384] Method 1.1: The first indication information includes the identifier of the radio bearer and the identifier of the second terminal device. It is understood that the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, enabling the second adaptation layer entity of the first terminal device to correctly deliver the first data to the correct RLC bearer.

[0385] Method 1.2: The first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, where the sidelink is the sidelink between the first terminal device and the second terminal device. It is understood that the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, enabling the second adaptation layer entity of the first terminal device to correctly deliver the first data to the correct RLC bearer.

[0386] The radio bearers in methods 1.1 and 1.2 may include DRBs and / or SRBs, without limitation.

[0387] Optionally, in this application, the identification information of the unicast connection on the sidelink may include one or more of the following: destination layer 2 identifier, source layer 2 identifier, etc., without limitation. In addition, the identification information of the unicast connection on the sidelink may be replaced by: identification information of the broadcast connection on the sidelink, identification information of the multicast connection on the sidelink, etc., without limitation.

[0388] Optionally, for method 1.2, the first indication information also includes the identifier of the second terminal device. That is, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the first adaptation layer entity of the first terminal device may also deliver the identifier of the second terminal device to the second adaptation layer entity of the first terminal device.

[0389] Optional, in Figure 5A and Figure 5B In this configuration, the first adaptation layer entity of the first terminal device is a Uu adaptation layer entity, and the second adaptation layer entity of the first terminal device is a PC5 adaptation layer entity. Specifically, the second adaptation layer entity of the first terminal device is a shared adaptation layer entity for at least one PC5 RLC bearer corresponding to a terminal device. It can be understood that a PC5 RLC bearer corresponding to a terminal device can be at least one PC5 RLC bearer.

[0390] It needs to be explained that, in Figure 5A and Figure 5B In this context, the first adapter layer entity and the second adapter layer entity of the first terminal device can be two independent adapter layer entities or the same adapter layer entity; no restriction is imposed here. It is understood that if the first adapter layer entity and the second adapter layer entity of the first terminal device are two independent adapter layer entities, this solution uses steps 501-502; if the first adapter layer entity and the second adapter layer entity of the first terminal device are the same adapter layer entity, this solution uses step 502.

[0391] Optional, Figure 5A and Figure 5B The illustrated embodiment may further include: a first adaptation layer entity of the first terminal device receiving fourth data from a first RLC bearer. That is, the first adaptation layer entity of the first terminal device receives fourth data from an RLC layer entity located within the first RLC bearer. The fourth data includes first data, an identifier of the radio bearer, and an identifier of the second terminal device, the identifier of the radio bearer and the identifier of the second terminal device being included in the header of the fourth data.

[0392] Optionally, if the first adaptation layer entity and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, the first adaptation layer entity of the first terminal device receives the fourth data from the first RLC bearer before step 501; if the first adaptation layer entity and the second adaptation layer entity of the first terminal device are the same adaptation layer entity, the first adaptation layer entity of the first terminal device receives the fourth data from the first RLC bearer before step 502. Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device, the first adaptation layer entity of the first terminal device can deliver the first data and the first indication information to the second adaptation layer entity of the first terminal device in any of the following ways, without limitation.

[0393] Method 2.1: The first adapter layer entity of the first terminal device delivers the fourth data to the second adapter layer entity of the first terminal device. The fourth data is a PDU, and the first data is an SDU. That is, the first adapter layer entity of the first terminal device does not perform any additional processing on the fourth data, thus avoiding any alteration of the packet header structure by the first adapter layer entity of the first terminal device.

[0394] Method 2.2: The identifier of the radio bearer and the identifier of the second terminal device are not included in the header of the first data, i.e., the first data is SDU. That is, the first adaptation layer entity of the first terminal device removes the header of the fourth data and additionally indicates the identifier of the radio bearer and the identifier of the second terminal device. It should be understood that the first terminal device can internally associate the identifier of the radio bearer and the identifier of the second terminal device with the first data, thus reducing overhead and improving downlink data delivery efficiency.

[0395] Method 2.3: The first adaptation layer entity of the first terminal device generates fifth data, which includes the first data and the identifier of the radio bearer. The first adaptation layer entity of the first terminal device delivers the fifth data and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device. The identifier of the second terminal device is delivered to the second adaptation layer entity through additional instructions. It should be understood that the first terminal device can internally associate the identifier of the second terminal device with the first data. The fifth data is a PDU, the first data is an SDU, and the identifier of the radio bearer is included in the header of the fifth data. That is, the first adaptation layer entity of the first terminal device reconstructs the fifth data. Because the identifier of the radio bearer is included in the header of the fifth data, while the identifier of the second terminal device is not included in the header of the fifth data, the overhead of the header is saved, improving the downlink data delivery efficiency.

[0396] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, the first adaptation layer entity of the first terminal device may deliver the first data and the first indication information to the second adaptation layer entity of the first terminal device in any of the following ways, without any restrictions.

[0397] Method 3.1: The identifier of the radio bearer and the identifier of the unicast connection on the sidelink are not included in the header of the first data, i.e., the first data is SDU. That is, the first adaptation layer entity of the first terminal device removes the header of the fourth data and additionally indicates the identifier of the radio bearer and the identifier of the unicast connection on the sidelink. It should be understood that the first terminal device can internally implement the association between the identifier of the unicast connection on the sidelink and the first data, thus reducing overhead and improving downlink data delivery efficiency.

[0398] Method 3.2: The first adaptation layer entity of the first terminal device generates fifth data, which includes the first data and the identifier of the radio bearer. The first adaptation layer entity of the first terminal device delivers the fifth data and the identifier information of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device. The fifth data is a PDU, the first data is an SDU, and the identifier of the radio bearer is included in the header of the fifth data. That is, the first adaptation layer entity of the first terminal device reconstructs the fifth data. Because the identifier of the radio bearer is included in the header of the fifth data, while the identifier information of the unicast connection on the sidelink is not included in the header of the fifth data but is sent to the second adaptation layer through additional indication information, the overhead of the header is saved, and the downlink data delivery efficiency is improved. It should be understood that the first terminal device can internally implement the association between the identifier information of the unicast connection on the sidelink and the first data.

[0399] Optionally, for method 3.1, if the first instruction information also includes the identifier of the second terminal device, then the identifier of the second terminal device may not be included in the header of the first data packet; for method 3.2, if the first instruction information also includes the identifier of the second terminal device, then the identifier of the second terminal device may or may not be included in the header of the fifth data packet, without limitation.

[0400] Optionally, for methods 3.1 and 3.2, since the fourth data received by the first adaptation layer entity of the first terminal device from the first RLC bearer includes the identifier of the radio bearer and the identifier of the second terminal device, the first adaptation layer entity of the first terminal device can determine the identifier information of the unicast connection on the sidelink based on the identifier of the second terminal device. Specifically, the first adaptation layer entity of the first terminal device determines the identifier information of the unicast connection on the sidelink based on the identifier of the second terminal device and the second correspondence, thereby realizing the conversion between the identifier of the second terminal device and the identifier information of the unicast connection on the sidelink.

[0401] The second correspondence includes the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0402] 502. The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first instruction information. The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

[0403] Accordingly, the second RLC bearer obtains the first data from the second adaptation layer entity of the first terminal device.

[0404] The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device. It can be understood as: the second RLC bearer is the PC5RLC bearer of the first terminal device used when the first terminal device communicates with the second terminal device.

[0405] It should be noted that in this application, the RLC bearer can be replaced by an RLC layer entity. For example, the first RLC bearer can be replaced by an RLC layer entity, and the second RLC bearer can be replaced by an RLC layer entity; no restrictions are imposed here.

[0406] Optionally, step 502 may include: the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, thereby enabling the second adaptation layer entity of the first terminal device to deliver the data correctly and improving the reliability of downlink data transmission.

[0407] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0408] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device, that is, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer can be implemented using method 4.1. If the first indication information includes the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink, that is, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, there is at least one RLC bearer on the sidelink, and the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer can be implemented using method 4.2 or 4.3. If the first indication information includes the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the unicast connection on the sidelink, that is, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, there is at least one RLC bearer on the sidelink, and the second adaptation layer entity of the first terminal device can deliver the first data to the second RLC bearer in mode 4.3.

[0409] Method 4.1 Figure 5A and Figure 5B The illustrated embodiment further includes: a second adaptation layer entity of the first terminal device determining a sidelink based on the identifier of the second terminal device and a second correspondence; the sidelink is a sidelink between the first terminal device and the second terminal device, and at least one RLC bearer corresponds to the sidelink; the second correspondence includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device; the second adaptation layer entity of the first terminal device delivering first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including: the second adaptation layer entity of the first terminal device delivering first data to the second RLC bearer among at least one RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence. Understandably, when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device needs to determine the side link based on the identifier of the second terminal device and the second correspondence, so that the data can be delivered to the corresponding side link. Furthermore, the first data can be delivered to the second RLC bearer in at least one RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby improving the reliability of downlink data transmission.

[0410] Method 4.2: The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence. This includes: the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer among at least one RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence. It is understood that when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device can deliver the data to the corresponding sidelink. Furthermore, by delivering the first data to the second RLC bearer among at least one RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, the second adaptation layer entity of the first terminal device can correctly deliver the data, improving the reliability of downlink data transmission.

[0411] The identifier of the second terminal device can be implemented internally by the first terminal device and determined based on the identifier information of the unicast connection on the sidelink. In another possible implementation, the first adaptation layer entity of the first terminal device will also submit the identifier of the second terminal device to the second adaptation layer entity of the first terminal device.

[0412] Method 4.3: The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first instruction information, including: the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third correspondence. It is understood that when the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device can deliver the data to the corresponding sidelink; furthermore, by delivering the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third correspondence, the second adaptation layer entity of the first terminal device can correctly deliver the data, improving the reliability of downlink data transmission.

[0413] The third correspondence includes the correspondence between the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the identifier of the second RLC bearer.

[0414] Optionally, the second adaptation layer entity of the first terminal device in method 4.3 delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence. This can be understood as: the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer of at least one RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence.

[0415] Among them, Figure 5A and Figure 5B In the illustrated embodiment, at least one RLC bearer is the PC5 RLC bearer of the first terminal device used when the first terminal device communicates with the second terminal device.

[0416] Optionally, for method 4.1 or method 4.2, Figure 5A and Figure 5B The illustrated embodiment may further include: a second adaptation layer entity of the first terminal device generating second data; the second data including first data and second indication information; the second indication information including the identifier of the radio bearer, or the second indication information including the identifier of the radio bearer and the identifier of the second terminal device; the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer of at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, including: the second adaptation layer entity of the first terminal device delivering the second data to the second RLC bearer of at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly deliver data, thereby improving the reliability of downlink data transmission.

[0417] The second data is a PDU, and the second indication information is included in the header of the second data. It is understood that, for mode 2.1, the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the second data; for modes 2.2, 2.3, 3.1, and 3.2, the identifier of the radio bearer is included in the header of the second data.

[0418] Optional, for method 4.3, Figure 5A and Figure 5BThe illustrated embodiment may further include: a second adaptation layer entity of the first terminal device generating third data; the third data including first data and second indication information; the second indication information including the identifier of the radio bearer; the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third correspondence, including: the second adaptation layer entity of the first terminal device delivering the third data to the second RLC bearer according to the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third correspondence, so that the second adaptation layer entity of the first terminal device can correctly deliver data, thereby improving the reliability of downlink data transmission.

[0419] The third data is the PDU, and the identifier of the radio bearer is included in the header of the third data.

[0420] Specifically, the second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence. This can be understood as: the second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer of at least one RLC bearer based on the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence.

[0421] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the second RLC bearer according to the first instruction information, thereby improving the reliability of downlink data transmission.

[0422] Optional, Figure 5A and Figure 5B The illustrated embodiment may further include: a first terminal device receiving first configuration information from an access network device, and correspondingly, the access network device sending the first configuration information to the first terminal device. The first configuration information includes one or more of the following: a first correspondence, a second correspondence, and a third correspondence, and the first configuration information is used to indicate one or more of the following: the first correspondence is the configuration information of the second adaptation layer of the first terminal device; the second correspondence is the configuration information of the first adaptation layer and / or the second adaptation layer of the first terminal device; the third correspondence is the configuration information of the second adaptation layer of the first terminal device.

[0423] The first configuration information can be included in RRC signaling or other signaling, without limitation. It is understood that the first configuration information can be sent by the access network device to the first terminal device when the access network device receives a configuration information request message from the first terminal device, or the first configuration information can be sent spontaneously by the access network device to the first terminal device, without limitation. The configuration information request message can be used to instruct the access network device to send the first configuration information.

[0424] Specifically, this can be achieved using any of the methods from 2.1 to 2.3 and method 4.1. Figure 5A and Figure 5B In the illustrated embodiment, the first correspondence is the configuration information of the PC5 adaptation layer of the first terminal device; the second correspondence is the configuration information of the PC5 adaptation layer of the first terminal device. That is, the first configuration information includes both the first and second correspondences. The first configuration information indicates one or more of the following: the first correspondence is the configuration information of the PC5 adaptation layer of the first terminal device; the second correspondence is the configuration information of the PC5 adaptation layer of the first terminal device. This can be implemented using any of methods 3.1-3.2 and method 4.2. Figure 5A and Figure 5B In the illustrated embodiment, the first correspondence is the configuration information of the PC5 adaptation layer of the first terminal device; the second correspondence is the configuration information of the Uu adaptation layer and / or the PC5 adaptation layer of the first terminal device. That is, the first configuration information includes both the first and second correspondences. The first configuration information indicates one or more of the following: the first correspondence is the configuration information of the PC5 adaptation layer of the first terminal device; the second correspondence is the configuration information of the Uu adaptation layer and the PC5 adaptation layer of the first terminal device. This can be implemented using any of methods 3.1-3.2 and method 4.3. Figure 5A and Figure 5B In the illustrated embodiment, the second correspondence is the configuration information of the Uu adaptation layer of the first terminal device; the third correspondence is the configuration information of the PC5 adaptation layer of the first terminal device.

[0425] Optionally, the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device can be contained in the same information cell or different information cells, without any restriction.

[0426] Optionally, if the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device are contained in the same information element, the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device can be contained in the first information element. The first information element can be a predefined information element or a fixed information element; there are no restrictions here. For example, the first information element can be an Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields; there are no restrictions here.

[0427] Optionally, implementation can be achieved using any of the methods 2.1-2.3 and method 4.1. Figure 5A and Figure 5B In the illustrated embodiment, the first information cell may include a first sub-information cell. This can be implemented using any of methods 3.1-3.2 and method 4.2. Figure 5A and Figure 5B In the illustrated embodiment, the first information element may include a first sub-information element, and optionally, the first information element may also include a second sub-information element. The first sub-information element may include one or more of the following: an identifier of a radio bearer, an identifier of a second terminal device, and an identifier of a second RLC bearer. The first sub-information element is used to indicate a first correspondence. The first sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the first sub-information element may be a MappingInfo information element in the Bearer-MappingInfoList information element, or an information element with a similar definition or function, or an information element with an extended field, without limitation. The second sub-information element may include one or more of the following: identification information of a unicast connection on the sidelink, and an identifier of the terminal device. The second sub-information element is used to indicate a second correspondence. The second sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the second sub-information element may be a dst-mappingInfo information element in the DST-MappingInfoList information element, or an information element with a similar definition or function, or an information element with an extended field, without limitation.

[0428] Optionally, when the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device are contained in the same information element, the first sub-information element may also include the identifier of the first RLC bearer. The first sub-information element is also used to indicate the correspondence between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0429] For example, when the first information cell includes a first sub-information cell and a second sub-information cell, the first information cell can be:

[0430]

[0431]

[0432] The Bearer-MappingInfoList element may include a first mapping relationship, where the access network device can configure a maximum of maxNrofRemoteUEs groups of mapping relationships, and maxNrofbearers is the maximum number of bearers corresponding to the terminal devices that the first terminal device can relay. The DST-MappingInfoList element may include a second mapping relationship, where the access network device can configure a maximum of maxNrofRemoteUEs groups of mapping relationships, and maxNrofRemoteUEs is the maximum number of terminal devices that the first terminal device can connect to. It can be understood that DRB-ID is the identifier of the radio bearer, Remote-UE-ID is the identifier of the second terminal device, PC5-RLC-bearer-id is the identifier of the second RLC bearer, Uu-RLC-bearer-id is the identifier of the first RLC bearer, and DestinationIndex is the identifier information of the unicast connection on the sidelink.

[0433] Optionally, implementation can be achieved using any of the methods 3.1-3.2 and method 4.3. Figure 5A and Figure 5B In the illustrated embodiment, the first information element may include a second sub-information element and a third sub-information element. The third sub-information element may include one or more of the following: an identifier of the radio bearer, identification information of the unicast connection on the sidelink, and an identifier of the second RLC bearer. The third sub-information element is used to indicate a third correspondence. The third sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the third sub-information element may be the MappingInfo information element in the Bearer-MappingInfoList information element, or an information element with a similar definition or function, or an information element with an extended field, without limitation. Optionally, if the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device are contained in different information elements, the configuration information of the Uu adaptation layer of the first terminal device is contained in the second information element, and the configuration information of the PC5 adaptation layer of the first terminal device is contained in the third information element. The second information element may be a predefined information element or a fixed information element, without limitation. For example, the second information element can be a Uu-Adapt-Config information element, or an information element with a similar definition or function, or an information element with an extended field; there are no restrictions here. The third information element can be a predefined information element or a fixed information element; there are no restrictions here. For example, the third information element can be a PC5-Adapt-Config information element, or an information element with a similar definition or function, or an information element with an extended field; there are no restrictions here.

[0434] Optionally, implementation can be achieved using any of the methods 2.1-2.3 and method 4.1. Figure 5A and Figure 5B In the illustrated embodiment, the third information element includes a first sub-information element and a second sub-information element.

[0435] Optionally, implementation can be achieved using any of the methods 3.1-3.2 and method 4.2. Figure 5A and Figure 5B In the illustrated embodiment, the second information element may include a second sub-information element, and the third information element may include a first sub-information element. Optionally, the third information element may also include the second sub-information element.

[0436] Optionally, implementation can be achieved using any of the methods 3.1-3.2 and method 4.3. Figure 5A and Figure 5B In the illustrated embodiment, the second information element may include a second sub-information element, and the third information element may include a third sub-information element.

[0437] For example, the second information element can be:

[0438]

[0439] For example, when the third information cell includes the first sub-information cell and the second sub-information cell, the third information cell can be:

[0440]

[0441]

[0442] As can be seen, in the above technical solution, the first terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0443] The following, combined with Figure 6A and Figure 6B This explains how to correctly submit uplink data when the PC5 adapter layer entity of the first terminal device is configured with only one PC5 adapter layer entity, and this is an adapter layer entity shared by the PC5 RLC bearer corresponding to at least one remote terminal device.

[0444] See Figure 6A and Figure 6B , Figure 6A A flowchart illustrating another data transmission method provided in this application embodiment is shown below. Figure 6B This is a flowchart illustrating another data transmission method provided in an embodiment of this application. Figure 6A and Figure 6B As shown, the method includes, but is not limited to, the following steps:

[0445] 601. The first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device.

[0446] Correspondingly, the second adaptation layer entity of the first terminal device receives the first data and the first instruction information from the first adaptation layer entity of the first terminal device.

[0447] Optionally, the first indication information is used to indicate the wireless bearer corresponding to the second terminal device transmitting the first data. Wherein, in Figure 6A and Figure 6B In this context, the first indication information is used to indicate the wireless bearer corresponding to the second terminal device transmitting the first data. This can be understood as: the first indication information is used to indicate the wireless bearer corresponding to the second terminal device sending the first data.

[0448] Optionally, the first instruction information can be implemented in any of the following ways, without any restrictions.

[0449] Method 1.1: The first indication information includes the identifier of the radio bearer and the identifier of the second terminal device. It is understood that the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, enabling the second adaptation layer entity of the first terminal device to correctly deliver the first data to the correct RLC bearer.

[0450] Method 1.2: The first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, where the sidelink is the sidelink between the first terminal device and the second terminal device. It is understood that the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, enabling the second adaptation layer entity of the first terminal device to correctly deliver the first data to the correct RLC bearer.

[0451] The radio bearers in methods 1.1 and 1.2 may include DRBs and / or SRBs, without limitation.

[0452] Regarding the identification information for unicast connections on the side link in method 1.2, please refer to... Figure 5A and Figure 5B The relevant descriptions will not be repeated here.

[0453] Optional, in Figure 6A and Figure 6BIn this configuration, the first adaptation layer entity of the first terminal device is a PC5 adaptation layer entity, and the second adaptation layer entity of the first terminal device is a Uu adaptation layer entity. The first adaptation layer entity of the first terminal device is a shared adaptation layer entity for at least one PC5 RLC bearer corresponding to a terminal device. It can be understood that a PC5 RLC bearer corresponding to a terminal device can be at least one PC5 RLC bearer.

[0454] It needs to be explained that, in Figure 6A and Figure 6B In this context, the first adapter layer entity and the second adapter layer entity of the first terminal device can be two independent adapter layer entities or the same adapter layer entity; no restriction is imposed here. It is understood that if the first adapter layer entity and the second adapter layer entity of the first terminal device are two independent adapter layer entities, this solution uses steps 601-602; if the first adapter layer entity and the second adapter layer entity of the first terminal device are the same adapter layer entity, this solution uses step 602.

[0455] Optional, Figure 6A and Figure 6B The illustrated embodiment may further include: a first adaptation layer entity of the first terminal device receiving third data from a second RLC bearer; the third data includes the identifier of the radio bearer and the first data, i.e., the identifier of the radio bearer is included in the header of the third data; or, the third data includes the identifier of the radio bearer, the identifier of the second terminal device, and the first data, i.e., the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the third data. For example, the first adaptation layer entity RLC layer entity of the first terminal device receives the third data, and this RLC layer entity is located in the second RLC bearer. The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device, i.e., the second RLC bearer is the PC5 RLC bearer of the first terminal device used when the first terminal device communicates with the second terminal device. Understandably, when the first adapter layer entity and the second adapter layer entity of the first terminal device are two independent adapter layer entities, the first adapter layer entity of the first terminal device receives the third data from the second RLC bearer before step 601; when the first adapter layer entity and the second adapter layer entity of the first terminal device are the same adapter layer entity, the first adapter layer entity of the first terminal device receives the third data from the second RLC bearer before step 602.

[0456] Optionally, if the first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device, the first adaptation layer entity of the first terminal device may deliver the first data and the first indication information to the second adaptation layer entity of the first terminal device in any of the following ways, without any limitation.

[0457] Method 2.1: When the third data includes the identifier of the radio bearer and the first data, the first adaptation layer entity of the first terminal device generates fourth data, which includes the first data, the identifier of the radio bearer, and the identifier of the second terminal device. The first adaptation layer entity of the first terminal device then delivers the fourth data to the second adaptation layer entity of the first terminal device. The fourth data is a PDU, the first data is an SDU, and the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the fourth data. In other words, the first adaptation layer entity of the first terminal device reconstructs the third data.

[0458] Method 2.2: When the third data includes the identifier of the radio bearer and the first data, the identifier of the radio bearer and the identifier of the second terminal device are not included in the header of the first data, and the first data is SDU. That is, the first adaptation layer entity of the first terminal device removes the header of the third data and additionally indicates the identifier of the radio bearer and the identifier of the second terminal device, so it can reduce overhead and improve the uplink data delivery efficiency.

[0459] Method 2.3: When the third data includes the identifier of the radio bearer and the first data, the first adaptation layer entity of the first terminal device delivers the third data and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device. Here, the third data is a PDU, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device does not process the third data, thus avoiding any alteration of the packet header structure by the first adaptation layer entity of the first terminal device.

[0460] Method 2.4: When the third data includes the identifier of the radio bearer, the identifier of the second terminal device, and the first data, the first adaptation layer entity of the first terminal device delivers the third data to the second adaptation layer entity of the first terminal device. Here, the third data is a PDU, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device does not process the third data, thus avoiding any alteration of the packet header structure by the first adaptation layer entity of the first terminal device.

[0461] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, the first adaptation layer entity of the first terminal device may deliver the first data and the first indication information to the second adaptation layer entity of the first terminal device in any of the following ways, without any restrictions.

[0462] Method 3.1: When the third data includes the identifier of the radio bearer and the first data, the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink are not included in the header of the first data. The first data is SDU. That is, the first adaptation layer entity of the first terminal device removes the header of the third data and additionally indicates the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink. Therefore, the overhead can be reduced and the uplink data delivery efficiency can be improved.

[0463] Method 3.2: When the third data includes the identifier of the radio bearer and the first data, the first adaptation layer entity of the first terminal device delivers the third data and the identification information of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device. Here, the fourth data is a PDU, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device does not process the third data and additionally indicates the identifier of the radio bearer and the identification information of the unicast connection on the sidelink, thus avoiding any alteration of the packet header structure by the first adaptation layer entity of the first terminal device.

[0464] Optionally, for methods 2.1-2.3, the first adaptation layer entity of the first terminal device needs to determine the identifier of the second terminal device. Specifically, the first adaptation layer entity of the first terminal device determines the identifier of the second terminal device based on the identifier information of the unicast connection on the sidelink and the first correspondence relationship, thereby realizing the conversion between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device. This sidelink is a sidelink for transmitting first data. The first correspondence relationship includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device.

[0465] 602. The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first instruction information.

[0466] Accordingly, the first RLC bearer obtains the first data from the second adaptation layer entity of the first terminal device.

[0467] Optionally, step 602 may include: the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to deliver the data correctly and improving the reliability of uplink data transmission.

[0468] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

[0469] Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the unicast connection on the sidelink, that is, if the first adaptation layer entity of the first terminal device delivers the identifier of the radio bearer and the identifier of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, Figure 6A and Figure 6B The illustrated embodiment further includes: a second adaptation layer entity of the first terminal device determines the identifier of the second terminal device based on the identifier information of the unicast connection on the sidelink and the first correspondence, thereby realizing the conversion between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device. It is understood that the second adaptation layer entity of the first terminal device can perform this action before the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0470] Optional, Figure 6A and Figure 6B The illustrated embodiment may further include: a second adaptation layer entity of the first terminal device generating second data; the second data including first data and second indication information; the second indication information including the identifier of the radio bearer and the identifier of the second terminal device; the second adaptation layer entity of the first terminal device delivering the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including: the second adaptation layer entity of the first terminal device delivering the second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, so that the second adaptation layer entity of the first terminal device can correctly deliver data, improving the reliability of uplink data transmission. Wherein, the second data is a PDU, and the second indication information is included in the header of the second data.

[0471] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the first RLC bearer according to the first instruction information, thereby improving the reliability of uplink data transmission.

[0472] Optional, Figure 6A and Figure 6BThe illustrated embodiment may further include: a first terminal device receiving first configuration information from an access network device, and correspondingly, the access network device sending the first configuration information to the first terminal device. The first configuration information includes one or more of the following: a first correspondence and a second correspondence; the first configuration information is used to indicate one or more of the following: the first correspondence is the configuration information of the first adaptation layer and / or the second adaptation layer of the first terminal device; the second correspondence is the configuration information of the second adaptation layer of the first terminal device.

[0473] The first configuration information can be included in RRC signaling or other signaling, without limitation. It is understood that the first configuration information can be sent by the access network device to the first terminal device when the access network device receives a configuration information request message from the first terminal device, or the first configuration information can be sent spontaneously by the access network device to the first terminal device, without limitation. The configuration information request message can be used to instruct the access network device to send the first configuration information.

[0474] Among them, methods 2.1 and 2.3 are used to achieve this. Figure 6A and Figure 6B In the illustrated embodiment, the first correspondence is the configuration information of the PC5 adaptation layer of the first terminal device; the second correspondence is the configuration information of the Uu adaptation layer of the first terminal device. That is, the first configuration information includes both the first and second correspondences. The first configuration information indicates one or more of the following: the first correspondence is the configuration information of the PC5 adaptation layer of the first terminal device; the second correspondence is the configuration information of the Uu adaptation layer of the first terminal device; implemented using any of the methods in 2.4. Figure 6A and Figure 6B In the illustrated embodiment, the second correspondence is the configuration information of the Uu adapter layer of the first terminal device, that is, the first configuration information includes the second correspondence, and the first configuration information is used to indicate that the second correspondence is the configuration information of the Uu adapter layer of the first terminal device; implemented using any of the methods 3.1-3.2. Figure 6A and Figure 6B In the illustrated embodiment, the first correspondence is the configuration information of the Uu adaptation layer of the first terminal device; the second correspondence is the configuration information of the Uu adaptation layer of the first terminal device. That is, the first configuration information includes the first correspondence and the second correspondence. The first configuration information is used to indicate one or more of the following: the first correspondence is the configuration information of the Uu adaptation layer of the first terminal device; the second correspondence is the configuration information of the Uu adaptation layer of the first terminal device.

[0475] Optionally, the configuration information of the PC5 adaptation layer of the first terminal device and the configuration information of the Uu adaptation layer of the first terminal device can be contained in the same information cell or different information cells, and there is no restriction here.

[0476] Optionally, if the configuration information of the PC5 adaptation layer and the configuration information of the Uu adaptation layer of the first terminal device are contained in the same information element, the configuration information of the PC5 adaptation layer and the configuration information of the Uu adaptation layer of the first terminal device can be contained in the first information element. The first information element can be a predefined information element or a fixed information element; there are no restrictions here. For example, the first information element can be an Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields; there are no restrictions here.

[0477] Optionally, implementations can be made using methods 2.1 and 2.3. Figure 6A and Figure 6B In the illustrated embodiment, the first information element may include a first sub-information element and a second sub-information element. The first sub-information element may include one or more of the following: identification information of a unicast connection on the sidelink, an identifier of the terminal device, and is used to indicate a first correspondence. The first sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the first sub-information element may be the dst-mappingInfo information element in DST-MappingInfoList, or an information element with a similar definition or function, or an information element with an extended field, without limitation. The second sub-information element may include one or more of the following: an identifier of a radio bearer, an identifier of a second terminal device, an identifier of a first RLC bearer, and is used to indicate a second correspondence. The second sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the second sub-information element may be the MappingInfo information element in Bearer-MappingInfoList, or an information element with a similar definition or function, or an information element with an extended field, without limitation.

[0478] Optionally, it can be implemented in any of the methods described in method 2.4. Figure 6A and Figure 6B In the illustrated embodiment, the first information cell may include a second sub-information cell.

[0479] Optionally, it can be implemented using any of the methods 3.1-3.2. Figure 6A and Figure 6B In the illustrated embodiment, the first information cell may include a first sub-information cell and a second sub-information cell.

[0480] Optionally, when the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device are contained in the same information element, the second sub-information element may also include the identifier of the second RLC bearer. The second sub-information element is also used to indicate the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0481] Optionally, if the configuration information of the PC5 adaptation layer and the configuration information of the Uu adaptation layer of the first terminal device are contained in different information elements, the configuration information of the Uu adaptation layer of the first terminal device is contained in the second information element, and the configuration information of the PC5 adaptation layer of the first terminal device is contained in the third information element. The second information element can be a predefined information element or a fixed information element, without restriction. For example, the second information element can be a Uu-Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields, without restriction. The third information element can be a predefined information element or a fixed information element, without restriction. For example, the third information element can be a PC5-Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields, without restriction.

[0482] Optionally, implementations can be made using methods 2.1 and 2.3. Figure 6A and Figure 6B In the illustrated embodiment, the second information element may include a second sub-information element, and the third information element may include a first sub-information element.

[0483] Optionally, it can be implemented in any of the methods described in method 2.4. Figure 6A and Figure 6B In the illustrated embodiment, the second information element may include the first sub-information element.

[0484] Optionally, it can be implemented using any of the methods 3.1-3.2. Figure 6A and Figure 6B In the illustrated embodiment, the second information cell may include a first sub-information cell and a second sub-information cell.

[0485] It should be noted that in this application, the downlink data transmission scheme adopts... Figure 5A and Figure 5B The illustrated embodiment, and the uplink data transmission scheme, adopt... Figure 6A and Figure 6B In the illustrated embodiment, the configuration information received by the first terminal device from the access network device includes: Figure 5A and Figure 5B The first configuration information involved in the illustrated embodiment and Figure 6A and Figure 6BThe illustrated embodiment involves first configuration information, meaning the access network device can simultaneously send downlink data transmission configuration information and uplink data transmission configuration information to the first terminal device. It is understood that in this case, the configuration information of the first terminal device's Uu adaptation layer and the configuration information of the first terminal device's PC5 adaptation layer can be contained in the same information cell or different information cells, without limitation. Specifically, when the configuration information of the first terminal device's Uu adaptation layer and the configuration information of the first terminal device's PC5 adaptation layer are contained in the same information cell... Figure 5A and Figure 5B The illustrated embodiment involves the configuration information of the Uu adapter layer of the first terminal device and the configuration information of the PC5 adapter layer of the first terminal device, as well as... Figure 6A and Figure 6B In the illustrated embodiment, the configuration information of the Uu adaptation layer and the PC5 adaptation layer of the first terminal device are both contained in the same information element. Conversely, if the configuration information of the Uu adaptation layer and the PC5 adaptation layer of the first terminal device are contained in different information elements... Figure 5A and Figure 5B The illustrated embodiment involves the configuration information of the Uu adapter layer of the first terminal device, and... Figure 6A and Figure 6B The configuration information of the Uu adaptation layer of the first terminal device involved in the illustrated embodiment is all contained in the same information element; Figure 5A and Figure 5B The illustrated embodiment involves the configuration information of the PC5 adaptation layer of the first terminal device, and... Figure 6A and Figure 6B The configuration information of the PC5 adaptation layer of the first terminal device involved in the illustrated embodiment is all contained in the same information element.

[0486] As can be seen, in the above technical solution, the first terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0487] The following, combined with Figure 7A and Figure 7B This explains how to correctly deliver downlink data when a first terminal device is configured with multiple PC5 adaptation layer entities, and one of these PC5 adaptation layer entities is the adaptation layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

[0488] See Figure 7A and Figure 7B , Figure 7A A flowchart illustrating another data transmission method provided in this application embodiment is shown below. Figure 7BThis is a flowchart illustrating another data transmission method provided in an embodiment of this application. Figure 7A and Figure 7B As shown, the method includes, but is not limited to, the following steps:

[0489] 701. The first adapter layer entity of the first terminal device delivers the first data and the second instruction information to the second adapter layer entity of the first terminal device according to the first instruction information.

[0490] Correspondingly, the second adaptation layer entity of the first terminal device receives the first data and the second instruction information from the first adaptation layer entity of the first terminal device.

[0491] Optionally, the first indication information is used to indicate the second terminal device that transmits the first data, and the first indication information is the identifier of the second terminal device.

[0492] Optionally, the second indication information is used to indicate the radio bearer, and the second indication information includes the identifier of the radio bearer. The radio bearer may include a DRB and / or an SRB, without limitation.

[0493] Optional, in Figure 7A and Figure 7B In this context, the first adaptation layer entity of the first terminal device is a Uu adaptation layer entity, and the second adaptation layer entity of the first terminal device is a PC5 adaptation layer entity. Specifically, the second adaptation layer entity of the first terminal device is the adaptation layer entity used by the PC5 RLC bearer corresponding to a single terminal device. It can be understood that the PC5 RLC bearer corresponding to a single terminal device can be at least one PC5 RLC bearer.

[0494] It needs to be explained that, in Figure 7A and Figure 7B In this context, the first adapter layer entity and the second adapter layer entity of the first terminal device can be two independent adapter layer entities or the same adapter layer entity; no restriction is imposed here. It is understood that if the first adapter layer entity and the second adapter layer entity of the first terminal device are two independent adapter layer entities, this solution uses steps 701-702; if the first adapter layer entity and the second adapter layer entity of the first terminal device are the same adapter layer entity, this solution uses step 702.

[0495] Optionally, step 701 may include: the first adapter layer entity of the first terminal device determining the second adapter layer entity of the first terminal device from multiple adapter layer entities based on the identifier of the second terminal device and the first correspondence relationship; the first adapter layer entity of the first terminal device delivering the first data and the second instruction information to the second adapter layer entity of the first terminal device, thereby enabling the first adapter layer entity of the first terminal device to correctly deliver the downlink data.

[0496] Among them, multiple adaptation layer entities can be the adaptation layer entities used by the PC5 RLC bearer corresponding to each of the multiple terminal devices, that is, a PC5 adaptation layer entity used by the PC5 RLC bearer corresponding to each terminal device.

[0497] Optionally, the first correspondence includes one or more of the following:

[0498] The correspondence between the identifier of the second terminal device and the identifier of the second adaptation layer entity of the first terminal device;

[0499] The correspondence between the identifier of the second terminal device and the identifier information of the unicast connection on the side link, wherein the side link is the side link between the first terminal device and the second terminal device; wherein, the second adaptation layer entity of the first terminal device corresponds to the side link, or, the second adaptation layer entity of the first terminal device corresponds to the second terminal device.

[0500] The identification information for unicast connections on the sidelink can be found by referring to... Figure 5A and Figure 5B The relevant descriptions will not be repeated here.

[0501] Optional, Figure 7A and Figure 7B The illustrated embodiment may further include: a first adaptation layer entity of the first terminal device receiving third data from a first RLC bearer, the third data including first data, an identifier of the radio bearer, and an identifier of the second terminal device, the identifier of the radio bearer and the identifier of the second terminal device being included in the header of the third data. For example, the first adaptation layer entity of the first terminal device receives the third data from an RLC layer entity, which is included in the first RLC bearer. Wherein, if the first adaptation layer entity and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, the first adaptation layer entity receiving the third data from the first RLC bearer is performed before step 701; if the first adaptation layer entity and the second adaptation layer entity of the first terminal device are the same adaptation layer entity, the first adaptation layer entity receiving the third data from the first RLC bearer is performed before step 702.

[0502] Optionally, the first adapter layer entity of the first terminal device may deliver the first data and the second instruction information to the second adapter layer entity of the first terminal device in any of the following ways, without any limitation.

[0503] Method 1.1: The first adaptation layer entity of the first terminal device generates fourth data, which includes the first data and the identifier of the radio bearer. The first adaptation layer entity of the first terminal device delivers the fourth data to the second adaptation layer entity of the first terminal device. The fourth data is a PDU, the first data is an SDU, and the identifier of the radio bearer is included in the header of the fourth data. In other words, the first adaptation layer entity of the first terminal device reconstructs the fourth data so that the identifier of the second terminal device is not included in the fourth data, thus saving header overhead and improving downlink data delivery efficiency.

[0504] Method 1.2: The first adapter layer entity of the first terminal device delivers the third data to the second adapter layer entity of the first terminal device. The third data is a PDU, and the first data is an SDU. This means that the first adapter layer entity of the first terminal device does not perform any additional processing on the third data, thus avoiding any alteration of the packet header structure by the first adapter layer entity of the first terminal device.

[0505] Method 1.3: The identifier of the radio bearer is not included in the header of the first data packet. The first data is SDU. That is, the first adaptation layer entity of the first terminal device removes the header of the third data packet and additionally indicates the identifier of the radio bearer. Therefore, it can reduce overhead and improve the downlink data delivery efficiency.

[0506] 702. The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the second instruction information. The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

[0507] Accordingly, the second RLC bearer obtains the first data from the second adaptation layer entity of the first terminal device.

[0508] The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device. It can be understood as: the second RLC bearer is the PC5RLC bearer of the first terminal device used when the first terminal device communicates with the second terminal device.

[0509] Optionally, step 702 may include: the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer according to the identifier of the radio bearer and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver downlink data and improving the reliability of downlink data transmission. It is understood that, for methods 1.1 and 1.3, after the second adaptation layer entity of the first terminal device receives the identifier of the radio bearer from the first adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device can deliver the first data to the second RLC bearer according to the identifier of the radio bearer and the second correspondence.

[0510] The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0511] Optionally, the second indication information also includes the identifier of the second terminal device. The second indication information is further used to instruct the second terminal device receiving the first data. The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer and the second correspondence. This can include: the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver downlink data and improving the reliability of downlink data transmission. It is understood that, regarding method 1.2, after the second adaptation layer entity of the first terminal device receives the identifier of the radio bearer and the identifier of the second terminal device from the first adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device can deliver the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

[0512] Optional, Figure 7A and Figure 7B The illustrated embodiment may further include: a second adaptation layer entity of the first terminal device generating second data; the second data including first data and third indication information; the third indication information including the identifier of the radio bearer, or the third indication information including the identifier of the radio bearer and the identifier of the second terminal device; the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including: the second adaptation layer entity of the first terminal device delivering the second data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, thereby enabling the second adaptation layer entity of the first terminal device to correctly deliver downlink data, improving the reliability of downlink data transmission. Wherein, the second data is a PDU, and the third indication information is included in the header of the second data.

[0513] Specifically, for methods 1.1 and 1.3, the identifier of the radio bearer is included in the header of the second data packet; for method 1.2, the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the second data packet.

[0514] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the second instruction information to the second adapter layer entity of the first terminal device according to the first instruction information, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the second RLC bearer according to the second instruction information, thereby improving the reliability of uplink data transmission.

[0515] Optional, Figure 7A and Figure 7B The illustrated embodiment may further include: a first terminal device receiving first configuration information from an access network device, and correspondingly, the access network device sending the first configuration information to the first terminal device. The first configuration information includes one or more of the following: a first correspondence and a second correspondence; the first configuration information is used to indicate one or more of the following: the first correspondence is configuration information of a first adaptation layer of the first terminal device; the second correspondence is configuration information of a second adaptation layer of the first terminal device.

[0516] The first configuration information can be included in RRC signaling or other signaling, without limitation. It is understood that the first configuration information can be sent by the access network device to the first terminal device when the access network device receives a configuration information request message from the first terminal device, or the first configuration information can be sent spontaneously by the access network device to the first terminal device, without limitation. The configuration information request message can be used to instruct the access network device to send the first configuration information.

[0517] Optionally, the configuration information of the first adaptation layer of the first terminal device and the configuration information of the second adaptation layer of the first terminal device can be contained in the same information cell or different information cells. That is, the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device can be contained in the same information cell or different information cells, and no restriction is imposed here.

[0518] Optionally, if the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device are contained in the same information element, the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device can be contained in the first information element. The first information element can be a predefined information element or a fixed information element; there are no restrictions here. For example, the first information element can be an Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields; there are no restrictions here.

[0519] Optionally, the first information element may include a first sub-information element and a second sub-information element. The first sub-information element may include one or more of the following: identification information of a unicast connection on the sidelink, an identifier of the second terminal device, or an identifier of the second adaptation layer entity of the first terminal device. The first sub-information element is used to indicate a first correspondence. The first sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the first sub-information element may be the dst-mappingInfo information element in the DST-MappingInfoList information element, or an information element with a similar definition or function, or an information element with an extended field, without limitation. The second sub-information element may include one or more of the following: an identifier of a radio bearer, an identifier of the second terminal device, or an identifier of a second RLC bearer. The second sub-information element is used to indicate a second correspondence. The second sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the second sub-information element may be the MappingInfo information element in the Bearer-MappingInfoList information element, or an information element with a similar definition or function, or an information element with an extended field, without limitation.

[0520] Optionally, when the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device are contained in the same information element, the second sub-information element may further include the identifier of the first RLC bearer. The second sub-information element is also used to indicate the correspondence between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0521] Where the first sub-cell includes one or more of the following: identification information of the unicast connection on the sidelink and the identifier of the terminal device, a specific example of the first sub-cell can be found in [reference needed]. Figure 5A and Figure 5B The first information element in the first information element will not be elaborated upon here. When the first information element includes one or more of the following: the identifier of the second adaptation layer entity of the first terminal device, or the identifier of the terminal device, the first information element can be:

[0522]

[0523] The Bearer-MappingInfoList information element may include a second mapping relationship. The access network device can configure a maximum of maxNrofRemoteUEs groups of mapping relationships, where maxNrofbearers represents the maximum number of bearers corresponding to the terminal devices that the first terminal device can relay. The DST-MappingInfoList information element may include a first mapping relationship. The access network device can configure a maximum of maxNrofRemoteUEs groups of mapping relationships, where maxNrofRemoteUEs represents the maximum number of terminal devices that the first terminal device can connect to. It can be understood that DRB-ID is the identifier of the radio bearer, Remote-UE-ID is the identifier of the second terminal device, PC5-RLC-bearer-id is the identifier of the second RLC bearer, Uu-RLC-bearer-id is the identifier of the first RLC bearer, and PC5-Adapt-ID is the identifier of the second adaptation layer entity of the first terminal device.

[0524] Optionally, if the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device are contained in different information elements, the configuration information of the Uu adaptation layer of the first terminal device is contained in the second information element, and the configuration information of the PC5 adaptation layer of the first terminal device is contained in the third information element. The second information element can be a predefined information element or a fixed information element, without restriction. For example, the second information element can be a Uu-Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields, without restriction. The third information element can be a predefined information element or a fixed information element, without restriction. For example, the third information element can be a PC5-Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields, without restriction.

[0525] Optionally, the second information cell may include the first sub-information cell. It is understood that, for downlink data transmission, the access network device may configure the first correspondence in the second information cell.

[0526] Optionally, the third information element may include the second sub-information element. It is understood that, for downlink data transmission, the access network device may configure a second correspondence in the third information element.

[0527] For example, if the first sub-element includes one or more of the following: identification information of the unicast connection on the sidelink, and the identifier of the terminal device, the second element can be:

[0528]

[0529]

[0530] For example, when the first sub-element includes one or more of the following: the identifier of the second adaptation layer entity of the first terminal device, or the identifier of the terminal device, the second element can be:

[0531]

[0532] For example, the third information element can be:

[0533]

[0534] As can be seen, in the above technical solution, the first terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0535] The following, combined with Figure 8A and Figure 8B This explains how to correctly submit uplink data when a first terminal device is configured with multiple PC5 adapter layer entities, and one of these PC5 adapter layer entities is the adapter layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

[0536] 801. The first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device.

[0537] Correspondingly, the second adaptation layer entity of the first terminal device receives the first data and the first instruction information from the first adaptation layer entity of the first terminal device.

[0538] Optionally, the first indication information is used to indicate the radio bearer, which may include DRB and / or SRB, without limitation.

[0539] Optional, in Figure 8A and Figure 8B In this context, the first adaptation layer entity of the first terminal device is a PC5 adaptation layer entity, and the second adaptation layer entity of the first terminal device is a Uu adaptation layer entity. Specifically, the first adaptation layer entity of the first terminal device is the adaptation layer entity used by the PC5 RLC bearer corresponding to one terminal device. It can be understood that the PC5 RLC bearer corresponding to one terminal device can be at least one PC5 RLC bearer.

[0540] It needs to be explained that, in Figure 8A and Figure 8BIn this context, the first adapter layer entity and the second adapter layer entity of the first terminal device can be two independent adapter layer entities or the same adapter layer entity; no restriction is imposed here. It is understood that if the first adapter layer entity and the second adapter layer entity of the first terminal device are two independent adapter layer entities, this solution uses steps 801-802; if the first adapter layer entity and the second adapter layer entity of the first terminal device are the same adapter layer entity, this solution uses step 802.

[0541] Optional, Figure 8A and Figure 8B The illustrated embodiment may further include: a first adaptation layer entity of the first terminal device receiving third data from a second RLC bearer, the third data including the identifier of the radio bearer, i.e., the identifier of the radio bearer is included in the header of the third data; or, the third data including the identifier of the radio bearer and the identifier of the second terminal device, i.e., the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the third data. For example, the first adaptation layer entity of the first terminal device receives the third data from an RLC layer entity included in the second RLC bearer. Wherein, the second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device, i.e., the second RLC bearer is the PC5 RLC bearer of the first terminal device used when the first terminal device communicates with the second terminal device. Understandably, when the first adapter layer entity and the second adapter layer entity of the first terminal device are two independent adapter layer entities, the first adapter layer entity of the first terminal device receives the third data from the second RLC bearer before step 801; when the first adapter layer entity and the second adapter layer entity of the first terminal device are the same adapter layer entity, the first adapter layer entity of the first terminal device receives the third data from the second RLC bearer before step 802.

[0542] Optionally, the first adapter layer entity of the first terminal device may deliver the first data and the first instruction information to the second adapter layer entity of the first terminal device in any of the following ways, without any restrictions.

[0543] Method 1.1: When the third data includes the identifier of the radio bearer and the first data, the first adaptation layer entity of the first terminal device generates fourth data, which includes the first data, the identifier of the radio bearer, and the identifier of the second terminal device. The first adaptation layer entity of the first terminal device then delivers the fourth data to the second adaptation layer entity of the first terminal device. The fourth data is a PDU, the first data is an SDU, and the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the fourth data. In other words, the first adaptation layer entity of the first terminal device reconstructs the third data.

[0544] Method 1.2: When the third data includes the identifier of the radio bearer and the first data, the first adaptation layer entity of the first terminal device delivers the third data and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device. Here, the third data is a PDU, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device does not process the third data, thus avoiding any alteration of the packet header structure by the first adaptation layer entity of the first terminal device.

[0545] Method 1.3: When the third data includes the identifier of the radio bearer and the first data, the identifier of the radio bearer and the identifier of the second terminal device are not included in the header of the first data, and the first data is SDU. That is, the first adaptation layer entity of the first terminal device removes the header of the third data and additionally indicates the identifier of the radio bearer and the identifier of the second terminal device, so it can reduce overhead and improve the uplink data delivery efficiency.

[0546] Method 1.4: When the third data includes the identifier of the radio bearer, the identifier of the second terminal device, and the first data, the first adaptation layer entity of the first terminal device delivers the third data to the second adaptation layer entity of the first terminal device. Here, the third data is a PDU, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device does not process the third data, thus avoiding any alteration of the packet header structure by the first adaptation layer entity of the first terminal device.

[0547] Optionally, for methods 1.2 and 1.3, the first adapter layer entity of the first terminal device can also submit the identifier of the second terminal device to the second adapter layer entity of the first terminal device. Therefore, the first adapter layer entity of the first terminal device can determine the identifier of the second terminal device according to the second instruction information and the second correspondence, thereby realizing the conversion between the second instruction information and the identifier of the second terminal device.

[0548] Optionally, the second indication information includes one or more of the following: the identifier of the first adaptation layer entity, the identifier information of the unicast connection on the sidelink, wherein the sidelink is the sidelink between the first terminal device and the second terminal device.

[0549] Optionally, the second correspondence may include one or more of the following:

[0550] The correspondence between the identifier of the first adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0551] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0552] Regarding the identification information for unicast connections on the sidelink, please refer to... Figure 5A and Figure 5BThe relevant descriptions in the text will not be repeated here.

[0553] 802. The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first instruction information.

[0554] Accordingly, the first RLC bearer obtains the first data from the second adaptation layer entity of the first terminal device.

[0555] Optionally, step 802 may include: the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, thereby enabling the second adaptation layer entity of the first terminal device to deliver the data correctly and improving the reliability of uplink data transmission.

[0556] The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

[0557] Optionally, for methods 1.2-1.3, if the first adapter layer entity of the first terminal device fails to deliver the identifier of the second terminal device to the second adapter layer entity of the first terminal device, Figure 8A and Figure 8B The illustrated embodiment further includes: a second adaptation layer entity of the first terminal device determines the identifier of the second terminal device based on third indication information and a third correspondence, thereby realizing the conversion between the third indication information and the identifier of the second terminal device. It is understood that the determination of the identifier of the second terminal device by the second adaptation layer entity of the first terminal device based on the third indication information and the third correspondence can be performed before the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence.

[0558] The third indication information includes one or more of the following: the identifier of the second adaptation layer entity, the identifier information of the unicast connection on the side link, the side link being the side link between the first terminal device and the second terminal device, and the side link corresponding to the first adaptation layer entity.

[0559] Optionally, the third correspondence includes one or more of the following:

[0560] The correspondence between the identifier of the second adaptation layer entity of the first terminal device and the identifier of the second terminal device;

[0561] The correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0562] Optional, Figure 8A and Figure 8BThe illustrated embodiment further includes: a second adaptation layer entity of the first terminal device generating second data; the second data includes first data, an identifier of the radio bearer, and an identifier of the second terminal device, or the second data includes first data and an identifier of the radio bearer; the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a first correspondence, including: the second adaptation layer entity of the first terminal device delivering the second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly deliver data, improving the reliability of uplink data transmission. Wherein, the second data is a PDU; for mode 1.4, the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the second data; for modes 1.1-1.3, the identifier of the radio bearer is included in the header of the second data.

[0563] As can be seen, in the above technical solution, the first adapter layer entity of the first terminal device delivers the first data and the first instruction information to the second adapter layer entity of the first terminal device, so that the second adapter layer entity of the first terminal device can correctly deliver the first data to the first RLC bearer according to the first instruction information, thereby improving the reliability of uplink data transmission.

[0564] Optional, Figure 8A and Figure 8B The illustrated embodiment may further include: a first terminal device receiving second configuration information from an access network device, and correspondingly, the access network device sending the second configuration information to the first terminal device. The second configuration information includes one or more of the following: a first correspondence, a second correspondence, and a third correspondence. The second configuration information is used to indicate one or more of the following: the first correspondence is the configuration information of the second adaptation layer of the first terminal device; the second correspondence is the configuration information of the first adaptation layer of the first terminal device; and the third correspondence is the configuration information of the second adaptation layer of the first terminal device.

[0565] The second configuration information can be included in RRC signaling or other signaling, without limitation. It is understood that the second configuration information can be sent by the access network device to the first terminal device when the access network device receives a configuration information request message from the first terminal device, or the second configuration information can be sent spontaneously by the access network device to the first terminal device, without limitation. The configuration information request message can be used to instruct the access network device to send the second configuration information.

[0566] Optionally, when the first adapter layer entity of the first terminal device delivers the identifier of the second terminal device to the second adapter layer entity of the first terminal device, the second configuration information includes a first correspondence and a second correspondence, and the second configuration information is used to indicate one or more of the following: the first correspondence is the configuration information of the second adapter layer of the first terminal device; the second correspondence is the configuration information of the first adapter layer of the first terminal device. When the first adapter layer entity of the first terminal device does not deliver the identifier of the second terminal device to the second adapter layer entity of the first terminal device, the second configuration information includes a first correspondence and a third correspondence, and the second configuration information is used to indicate one or more of the following: the first correspondence is the configuration information of the second adapter layer of the first terminal device; the third correspondence is the configuration information of the second adapter layer of the first terminal device.

[0567] Optionally, the configuration information of the first adaptation layer of the first terminal device and the configuration information of the second adaptation layer of the first terminal device can be contained in the same information cell or different information cells. That is, the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device can be contained in the same information cell or different information cells, and no restriction is imposed here.

[0568] Optionally, if the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device are contained in the same information element, the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device can be contained in the first information element. The first information element can be a predefined information element or a fixed information element; there are no restrictions here. For example, the first information element can be an Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields; there are no restrictions here.

[0569] Optionally, when the first adaptation layer entity of the first terminal device delivers the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the first information element may include a first sub-information element and a second sub-information element. The first sub-information element may include one or more of the following: an identifier of a radio bearer, an identifier of the second terminal device, and an identifier of a first RLC bearer. The first sub-information element is used to indicate a first correspondence. The first sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the first sub-information element may be a MappingInfo information element in a Bearer-MappingInfoList information element, or an information element with a similar definition or function, or an information element with an extended field, without limitation. The second sub-information element may include one or more of the following: an identifier of the first adaptation layer entity of the first terminal device, an identifier of the second terminal device, and identification information of a unicast connection on the sidelink. The second sub-information element is used to indicate a second correspondence. The second sub-information element may be a predefined information element or a fixed information element, without limitation. For example, the second sub-element can be the dst-mappingInfo element in the DST-MappingInfoList element, or an element with a similar definition or function, or an element with an extended field; there are no restrictions here.

[0570] Optionally, if the first adaptation layer entity of the first terminal device does not deliver the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the first information cell may include a first sub-information cell and a third sub-information cell. The third sub-information cell may include one or more of the following: the identifier of the second adaptation layer entity of the first terminal device, the identifier of the second terminal device, and the identifier information of the unicast connection on the sidelink. The third sub-information cell is used to indicate a third correspondence. The third sub-information cell can be a predefined information cell or a fixed information cell; there is no restriction here. The second sub-information cell may be the same information cell as the third sub-information cell or a different information cell; there is no restriction here.

[0571] Optionally, when the configuration information of the Uu adaptation layer of the first terminal device and the configuration information of the PC5 adaptation layer of the first terminal device are contained in the same information cell, the first sub-information cell may also include the identifier of the second RLC bearer. The first sub-information cell is also used to indicate the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

[0572] Optionally, if the configuration information of the Uu adaptation layer and the configuration information of the PC5 adaptation layer of the first terminal device are contained in different information elements, the configuration information of the Uu adaptation layer of the first terminal device can be contained in the second information element, and the configuration information of the PC5 adaptation layer of the first terminal device can be contained in the third information element. The second information element can be a predefined information element or a fixed information element, without restriction. For example, the second information element can be a Uu-Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields, without restriction. The third information element can be a predefined information element or a fixed information element, without restriction. For example, the third information element can be a PC5-Adapt-Config information element, or an information element with a similar definition or function, or an information element with extended fields, without restriction.

[0573] Optionally, when the first adapter layer entity of the first terminal device delivers the identifier of the second terminal device to the second adapter layer entity of the first terminal device, the second information element may include the second sub-information element, and the third information element may include the first sub-information element.

[0574] Optionally, if the first adapter layer entity of the first terminal device does not deliver the identifier of the second terminal device to the second adapter layer entity of the first terminal device, the third information element may include the first sub-information element and the third sub-information element.

[0575] It should be noted that in this application, the downlink data transmission scheme adopts... Figure 7A and Figure 7B The illustrated embodiment, and the uplink data transmission scheme, adopt... Figure 8A and Figure 8B In the illustrated embodiment, the configuration information received by the first terminal device from the access network device includes: Figure 7A and Figure 7B The first configuration information involved in the illustrated embodiment and Figure 8A and Figure 8B The illustrated embodiment involves first configuration information, meaning the access network device can simultaneously send downlink data transmission configuration information and uplink data transmission configuration information to the first terminal device. It is understood that in this case, the configuration information of the first terminal device's Uu adaptation layer and the configuration information of the first terminal device's PC5 adaptation layer can be contained in the same information cell or different information cells, without limitation. Specifically, when the configuration information of the first terminal device's Uu adaptation layer and the configuration information of the first terminal device's PC5 adaptation layer are contained in the same information cell... Figure 7A and Figure 7B The illustrated embodiment involves the configuration information of the Uu adapter layer of the first terminal device and the configuration information of the PC5 adapter layer of the first terminal device, as well as... Figure 8A and Figure 8BIn the illustrated embodiment, the configuration information of the Uu adaptation layer and the PC5 adaptation layer of the first terminal device are both contained in the same information element. Conversely, if the configuration information of the Uu adaptation layer and the PC5 adaptation layer of the first terminal device are contained in different information elements... Figure 7A and Figure 7B The illustrated embodiment involves the configuration information of the Uu adapter layer of the first terminal device, and... Figure 8A and Figure 8B The configuration information of the Uu adaptation layer of the first terminal device involved in the illustrated embodiment is all contained in the same information element; Figure 7A and Figure 7B The illustrated embodiment involves the configuration information of the PC5 adaptation layer of the first terminal device, and... Figure 8A and Figure 8B The configuration information of the PC5 adaptation layer of the first terminal device involved in the illustrated embodiment is all contained in the same information element.

[0576] As can be seen, in the above technical solution, the first terminal device receives the second configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the second configuration information, thereby improving the reliability of data transmission.

[0577] The following, combined with Figure 9 This section explains how to correctly submit downlink data from the perspective of the second terminal device.

[0578] See Figure 9 , Figure 9 A flowchart illustrating another data transmission method provided in this application embodiment. For example... Figure 9 As shown, the method includes, but is not limited to, the following steps:

[0579] 901. The adaptation layer entity of the second terminal device receives second data from the RLC bearer of the second terminal device, the second data including second indication information.

[0580] Correspondingly, the RLC bearer of the second terminal device submits the second data to the adaptation layer entity of the second terminal device.

[0581] Optionally, the adaptation layer entity of the second terminal device may receive data from at least one RLC bearer and / or from at least one PDCP layer entity, without limitation. It is understood that the RLC bearer of the second terminal device in step 901 can be one of at least one RLC bearer. Specifically, the RLC bearer of the second terminal device is the PC5 RLC bearer of the second terminal device.

[0582] Optionally, the second indication information is used to indicate the radio bearer corresponding to the second terminal device receiving the second data. The second indication information is an identifier of the radio bearer, or the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device.

[0583] Optionally, step 901 can be replaced by: the adaptation layer entity of the second terminal device receiving the second data from the RLC layer entity of the second terminal device, and correspondingly, the RLC layer entity of the second terminal device submitting the second data to the adaptation layer entity of the second terminal device.

[0584] 902. The adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the second instruction information.

[0585] Accordingly, the PDCP layer entity of the second terminal device receives the second data from the adaptation layer entity of the second terminal device.

[0586] Optionally, if the second indication information includes the identifier of the radio bearer, step 902 may include: the adaptation layer entity of the second terminal device delivering the second data to the PDCP layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence, so that the adaptation layer entity of the second terminal device can correctly deliver the downlink data, thereby improving the reliability of downlink data transmission. That is, when the second indication information includes the identifier of the radio bearer, or when the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device, the adaptation layer entity of the second terminal device can deliver the second data to the PDCP layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence.

[0587] The first correspondence includes the correspondence between the identifier of the wireless bearer and the identifier of the PDCP layer entity of the second terminal device.

[0588] As can be seen, in the above technical solution, the adaptation layer entity of the second terminal device receives the second data from the RLC bearer of the second terminal device, so that the adaptation layer entity of the second terminal device can correctly deliver the first data to the PDCP layer entity of the second terminal device according to the second instruction information, thereby improving the reliability of downlink data transmission.

[0589] Optional, Figure 9The illustrated embodiment may further include: the second terminal device receiving first configuration information from the access network device, and correspondingly, the access network device sending the first configuration information to the second terminal device. The first configuration information includes one of the following: a first correspondence and a second correspondence; the first configuration information is used to indicate that the first correspondence and / or the second correspondence is configuration information for the adaptation layer of the second terminal device. It is understood that when the second indication information is an identifier of a radio bearer, the first configuration information includes the first correspondence, and the first configuration information is used to indicate that the first correspondence is configuration information for the adaptation layer of the second terminal device; when the second indication information is an identifier of a radio bearer and an identifier of the second terminal device, the first configuration information includes the second correspondence, and the first configuration information is used to indicate that the second correspondence is configuration information for the adaptation layer of the second terminal device.

[0590] The first configuration information can be included in RRC signaling or other signaling, without limitation. It is understood that the first configuration information can be sent by the access network device to the second terminal device when it receives a configuration information request message from the second or third terminal device, or the first configuration information can be sent spontaneously by the access network device to the first terminal device, without limitation. The configuration information request message can be used to instruct the access network device to send the first configuration information.

[0591] Optionally, the second terminal device receiving the first configuration information from the access network device may include: the second terminal device receiving the first configuration information from the first terminal device, and the first terminal device receiving the first configuration information from the access network device.

[0592] As can be seen, in the above technical solution, the second terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0593] The following, combined with Figure 10 This section explains how to correctly submit uplink data from the perspective of the second terminal device.

[0594] See Figure 10 , Figure 10 A flowchart illustrating another data transmission method provided in this application embodiment. For example... Figure 10 As shown, the method includes, but is not limited to, the following steps:

[0595] 1001. The adaptation layer entity of the second terminal device generates second data; the second data includes first data and second indication information, wherein the first data is data received by the adaptation layer entity of the second terminal device from the PDCP layer entity of the second terminal device.

[0596] Optionally, the second indication information is used to indicate a radio bearer, or the second indication information is used to indicate a radio bearer corresponding to the second terminal device receiving the second data. It is understood that when the second indication information is used to indicate a radio bearer, the second indication information is an identifier of the radio bearer. When the second indication information is used to indicate a radio bearer corresponding to the second terminal device receiving the second data, the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device. The identifier of the second terminal device can be received by the second terminal device from the access network device.

[0597] For example, in one possible implementation, before the second terminal device establishes an RRC connection, the first terminal device requests an identifier for the second terminal device from the access network device via an RRC message, such as a SidelinkUEInformationNR (SUI) message. After the access network allocates the identifier, it sends the allocated identifier to the first terminal device via an RRC message, and the first terminal device then informs the second terminal device of the identifier via SL. The identifier of the second terminal device can be sent to the second terminal device via a sidelink RRC message, PC5 signaling, or MAC CE message. In another possible implementation, the access network device can receive an RRC setup request message sent by the second terminal device; that is, after the second terminal device initiates the RRC connection establishment, it carries the identifier of the second terminal device in the reply RRC setup message.

[0598] 1002. The adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the second instruction information.

[0599] Correspondingly, the RLC bearer of the second terminal device obtains the second data from the adaptation layer entity of the second terminal device.

[0600] Optionally, the adaptation layer entity of the second terminal device may receive data from at least one RLC bearer and / or from at least one PDCP layer entity, without limitation. It is understood that the RLC bearer of the second terminal device in step 1002 can be one of at least one RLC bearer. Specifically, the RLC bearer of the second terminal device is the PC5 RLC bearer of the second terminal device.

[0601] Optionally, if the second indication information is the identifier of the radio bearer, step 1002 may include: the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer and the first correspondence, so that the adaptation layer entity of the second terminal device can correctly deliver the uplink data, thereby improving the reliability of uplink data transmission.

[0602] The first correspondence includes the correspondence between the identifier of the radio bearer and the identifier of the RLC bearer of the second terminal device.

[0603] Optionally, if the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device, step 1002 may include: the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the adaptation layer entity of the second terminal device can correctly deliver the uplink data and improve the reliability of uplink data transmission.

[0604] As can be seen, in the above technical solution, the adapter layer entity of the second terminal device generates second data, which includes first data and second indication information. This enables the adapter layer entity of the second terminal device to correctly deliver the second data to the RLC bearer of the second terminal device according to the second indication information, thereby improving the reliability of uplink data transmission.

[0605] Optional, Figure 10 The illustrated embodiment may further include: the second terminal device receiving first configuration information from the access network device, and correspondingly, the access network device sending the first configuration information to the second terminal device. The first configuration information includes one of the following: a first correspondence and a second correspondence, wherein the first configuration information is used to indicate that either the first or second correspondence is configuration information for the adaptation layer of the second terminal device. It is understood that when the second indication information is an identifier of a radio bearer, the first configuration information includes the first correspondence, and the first configuration information is used to indicate that the first correspondence is configuration information for the adaptation layer of the second terminal device; when the second indication information is an identifier of a radio bearer and an identifier of the second terminal device, the first configuration information includes the second correspondence, and the first configuration information is used to indicate that the second correspondence is configuration information for the adaptation layer of the second terminal device.

[0606] The first configuration information can be included in RRC signaling or other signaling, without limitation. It is understood that the first configuration information can be sent by the access network device to the second terminal device when it receives a configuration information request message from the second or third terminal device, or the first configuration information can be sent spontaneously by the access network device to the first terminal device, without limitation. The configuration information request message can be used to instruct the access network device to send the first configuration information.

[0607] Optionally, the second terminal device receiving the first configuration information from the access network device may include: the second terminal device receiving the first configuration information from the first terminal device, and the first terminal device receiving the first configuration information from the access network device.

[0608] It should be noted that, in this application, the configuration information received by the second terminal device from the access network device includes... Figure 9 The first configuration information involved in the illustrated embodiment and Figure 10 The first configuration information involved in the illustrated embodiment means that the access network device can simultaneously send the configuration information related to downlink data transmission and the configuration information related to uplink data transmission to the second terminal device.

[0609] As can be seen, in the above technical solution, the second terminal device receives the first configuration information from the access network device, which enables the first terminal device to correctly deliver data between different protocol layer entities according to the first configuration information, thereby improving the reliability of data transmission.

[0610] The following, combined with Figure 11 This section explains how to correctly submit downlink data from the perspective of the access network equipment.

[0611] See Figure 11 , Figure 11 A flowchart illustrating another data transmission method provided in this application embodiment. For example... Figure 11 As shown, the method includes, but is not limited to, the following steps:

[0612] 1101. The adaptation layer entity of the access network device generates second data; the second data includes first data and second indication information, wherein the first data is data received by the adaptation layer entity of the access network device from the PDCP layer entity of the access network device.

[0613] Optionally, the second indication information is used to indicate the radio bearer corresponding to the second terminal device receiving the second data, and the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device.

[0614] The PDCP layer entity of the access network device is used to transmit data corresponding to the second terminal device.

[0615] 1102. The adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the second instruction information.

[0616] Accordingly, the RLC bearer of the access network device obtains the second data from the adaptation layer entity of the access network device.

[0617] Among them, the RLC bearer of the access network device is the RLC bearer used when the access network device and the first terminal device communicate, that is, the RLC bearer of the access network device is the Uu RLC bearer used when the access network device and the first terminal device communicate.

[0618] Optionally, the adaptation layer entity of the access network device may receive data from at least one RLC bearer and / or from at least one PDCP layer entity, without limitation. It is understood that the RLC bearer of the access network device in step 1102 can be one of at least one RLC bearer.

[0619] Optionally, step 1102 may include: the adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the adaptation layer entity of the access network terminal device can correctly deliver the downlink data, thereby improving the reliability of downlink data transmission.

[0620] The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the RLC bearer of the access network device.

[0621] As can be seen, in the above technical solution, the adaptation layer entity of the access network device generates second data, which includes first data and second indication information. This enables the adaptation layer entity of the access network device to correctly deliver the second data to the RLC bearer of the access network device according to the second indication information, thereby improving the reliability of downlink data transmission.

[0622] The following, combined with Figure 12 This section explains how to correctly submit uplink data from the perspective of the access network equipment.

[0623] See Figure 12 , Figure 12 A flowchart illustrating another data transmission method provided in this application embodiment. For example... Figure 12 As shown, the method includes, but is not limited to, the following steps:

[0624] 1201. The adaptation layer entity of the access network device receives second data from the RLC bearer of the access network device, the second data including second indication information.

[0625] Correspondingly, the RLC bearer of the access network device submits the second data to the adaptation layer entity of the access network device.

[0626] Among them, the RLC bearer of the access network device is the RLC bearer used when the access network device and the first terminal device communicate, that is, the RLC bearer of the access network device is the Uu RLC bearer used when the access network device and the first terminal device communicate.

[0627] Optionally, the second indication information is used to indicate the radio bearer corresponding to the second terminal device receiving the second data, and the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device.

[0628] 1202. The adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the second instruction information.

[0629] Accordingly, the PDCP layer entity of the access network device receives the second data from the adaptation layer entity of the access network device.

[0630] The PDCP layer entity of the access network device is used to transmit data corresponding to the second terminal device.

[0631] Optionally, step 1202 may include: the adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence, so that the adaptation layer entity of the access network device can correctly deliver the uplink data, thereby improving the reliability of uplink data transmission.

[0632] The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the PDCP layer entity of the access network device.

[0633] As can be seen, in the above technical solution, the adaptation layer entity of the access network device receives the second data from the RLC bearer of the access network device, which enables the adaptation layer entity of the access network device to correctly deliver the first data to the PDCP layer entity of the access network device according to the second instruction information, thereby improving the reliability of uplink data transmission.

[0634] The following combination Figure 13A and Figure 13B This example illustrates the process of transmitting downlink data from an access network device to a second terminal device via a first terminal device, and the process of transmitting uplink data from the second terminal device to the access network device via the first terminal device. It is understood that... Figure 13A In this configuration, the first terminal device is configured with only one PC5 adapter layer entity, and this PC5 adapter layer entity is a shared adapter layer entity for the PC5 RLC bearer of at least one remote terminal device; Figure 13B In the first terminal device, multiple PC5 adaptation layer entities are configured, and one of these PC5 adaptation layer entities is an adaptation layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

[0635] like Figure 13A and Figure 13BAs shown, in the downlink data transmission scheme, the adaptation layer entity of the access network device receives the first data from the higher-layer protocol entity corresponding to the second terminal device. Specifically, the adaptation layer entity of the access network device receives the first data from the PDCP layer entity of the access network device. The PDCP layer entity of the access network device is used to transmit the data corresponding to the second terminal device. The subsequent actions performed by the adaptation layer entity of the access network device can be referenced... Figure 11 Steps 1101-1102; then, the first terminal device receives the second data from the access network device through the first RLC bearer; next, for... Figure 13A The actions performed by the first terminal device can be referenced. Figure 5A Steps 501-502, for Figure 13B The actions performed by the first terminal device can be referenced. Figure 7A Steps 701-702 are not described in detail here; further, the second terminal device receives the second data from the first terminal device through the RLC bearer of the second terminal device; then, the actions performed by the second terminal device can be referred to Figure 9 Steps 901-902. Understandably, when the second data received by the second terminal device from the first terminal device via the second terminal device's RLC bearer includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the radio bearer identifier and a first correspondence relationship, whereby the first correspondence relationship includes the correspondence between the radio bearer identifier and the identifier of the PDCP layer entity of the second terminal device; when the second data received by the second terminal device from the first terminal device via the second terminal device's RLC bearer includes the identifier of the radio bearer and the identifier of the second terminal device, the adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the radio bearer identifier, the identifier of the second terminal device, and the second correspondence relationship, whereby the second correspondence relationship includes the correspondence between the radio bearer identifier, the identifier of the second terminal device, and the identifier of the PDCP layer entity of the second terminal device.

[0636] like Figure 13A and Figure 13B As shown, in the uplink data transmission scheme, the adaptation layer entity of the second terminal device receives the first data from the PDCP layer entity of the second terminal device; subsequently, the actions performed by the adaptation layer entity of the second terminal device can be referred to... Figure 10 Steps 1001-1002; then, the first terminal device receives second data from the second terminal device via the second RLC bearer; next, for... Figure 13A The actions performed by the first terminal device can be referenced. Figure 6A Steps 601-602 are for... Figure 13BThe actions performed by the first terminal device can be referenced. Figure 8A Steps 801-802 are not detailed here; further, the access network device receives the second data from the first terminal device through the access network device's RLC bearer; then, the actions performed by the access network device can be referred to Figure 12 Steps 1201-1202. Understandably, when the second data generated by the adaptation layer entity of the second terminal device includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer and the first correspondence relationship, whereby the first correspondence relationship includes the correspondence between the identifier of the radio bearer and the identifier of the RLC bearer of the second terminal device; when the second data generated by the adaptation layer entity of the second terminal device includes the identifier of the radio bearer and the identifier of the second terminal device, the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence relationship, whereby the second correspondence relationship includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the RLC bearer of the second terminal device.

[0637] It should be noted that, in this application, the actions performed by the first terminal device regarding the downlink data transmission scheme can be referred to... Figure 5A In steps 501-502, the uplink data transmission scheme and the actions performed by the first terminal device can be referenced. Figure 6A Steps 601-602; For the downlink data transmission scheme, refer to the actions performed by the first terminal device. Figure 7A Steps 701-702, regarding the uplink data transmission scheme, can be referenced in the actions performed by the first terminal device. Figure 8A Steps 801-802.

[0638] In addition, the process of transmitting downlink data from the access network device to other terminal devices through the first terminal device can refer to the process of transmitting downlink data from the access network device to the second terminal device through the first terminal device; the process of transmitting uplink data from other terminal devices to the access network device through the first terminal device can refer to the process of transmitting uplink data from the second terminal device to the access network device through the first terminal device, and will not be elaborated here.

[0639] Furthermore, this solution may also involve a distinction between the second terminal device bearer and the first terminal device bearer. Specifically, on the Uu link, the first terminal device's wireless bearer refers to the wireless bearer used for communication between the first terminal device and the access network device, carrying the data exchanged between them. On the sidelink, the first terminal device's wireless bearer refers to the wireless bearer used for communication between the first and second terminal devices, carrying the data exchanged directly between them via the sidelink.

[0640] As mentioned earlier, the main function of the adaptation layer is to multiplex data from different radio bearers onto a single RLC bearer. The above embodiments only consider the scenario where radio bearers from different terminal devices are multiplexed onto an RLC bearer. Furthermore, the adaptation layer may also multiplex the radio bearers of a second terminal device and a first terminal device onto a single RLC bearer. In this case, the adaptation layer needs to distinguish between the two during the routing process.

[0641] One possible implementation is that the access network device also assigns an identifier for the second terminal device to the first terminal device, and informs the first terminal device of this identifier. When the radio bearer data of the first terminal device and the radio bearer data of the second terminal device are multiplexed on a Uu RLC bearer, the adaptation layer carries the assigned identifier of the second terminal device in the adaptation layer PDU header of the radio bearer data of the first terminal device. Optionally, the identifier of the second terminal device can be directly given by the protocol. Another possible implementation is to introduce indication information in the adaptation layer PDU header to indicate whether the data is data of the second terminal device or data of the first terminal device. For example, it could be a 1-bit indication information, where 0 indicates that the data is data of the second terminal device and 1 indicates that the data is data of the first terminal device.

[0642] Based on the above method, during uplink transmission, the adaptation layer of the first terminal device adds the identifier or indication information of the second terminal device to the PDU header of the adaptation layer and sends it to the access network device. After receiving the data, the access network device, according to the identifier or indication information of the second terminal device carried on the PDU of the adaptation layer, delivers the data to the upper-layer entity of the second terminal device or the upper-layer entity of the first terminal device. In the downlink transmission direction, the adaptation layer of the access network device adds the identifier or indication information of the second terminal device to the PDU header of the adaptation layer. When the first terminal device receives the data, according to the identifier or indication information of the second terminal device on the PDU header of the adaptation layer, it delivers its own data to the upper layer of the first terminal device or maps the data of the second terminal device to the PC5 RLC bearer of the second terminal device.

[0643] When the data of the first terminal device and the data of the second terminal device are multiplexed on a PC5 RLC bearer, if the second terminal device carries the identifier of the second terminal device in the adaptation layer header during uplink data transmission, the data can be distinguished in the above manner; if the second terminal device does not perceive the identifier of the second terminal device, it can be distinguished by carrying indication information.

[0644] To distinguish between the data of the first terminal device and the data of the second terminal device, another possible approach is to restrict the data of the first terminal device and the data of the second terminal device from being reused on the same RLC bearer. In this case, the UE can determine whether the data on different RLC bearers belongs to the second terminal device or the first terminal device based on the configuration of the access network device.

[0645] Secondly, this solution may also involve the distinction between SRBs and DRBs. It is understood that the radio bearer of the second terminal device in the above embodiments includes both DRBs and SRBs. In existing technology, the bearer between a terminal device and an access network device can contain a maximum of SRB1 to SRB3 and 32 DRBs. Therefore, the access network device uses 2 bits to identify SRB1 to 3, corresponding to identifiers 1 to 3 respectively, and uses 5 bits to identify DRB1 to DRB32, corresponding to identifiers 1 to 32 respectively. Based on the existing radio bearer identifiers (RB IDs), if SRBs and DRBs are multiplexed in the RLC bearer, the adaptation layer will not be able to distinguish between SRB data and DRB data with identifiers of 1 to 3.

[0646] One possible implementation is to add a 1-bit indicator to the adapter layer header to indicate the bearer type. For example, an indicator of 0 corresponds to SRB data, and an indicator of 1 corresponds to DRB data. Based on the indicator and the RB ID, the adapter layer can uniquely determine which radio bearer the data belongs to. The RB ID is a 5-bit binary form. For example, if the adapter layer PDU header contains the indicator "0" and the RB ID 2, it means that the adapter layer PDU contains SRB2 data.

[0647] Another possible implementation is for the access network device to remap the SRB ID and DRB ID to ensure that their numbers are unique, and then inform the first and second terminal devices of the remapped ID information for adding and identifying RB ID information in the adaptation layer header. For example, the access network device configures the identifiers of SRB1-3 as 1-3 and the identifiers of DRB1-32 as 4-35, and informs the first and second terminal devices of the correspondence between SRB / DRB and identifiers. After remapping, the maximum RB ID can be 35, therefore 6 bits of space need to be reserved in the adaptation layer PDU header to carry the RBID information.

[0648] In another possible approach, the aforementioned remapping relationship can be directly given by the protocol, that is, specifying that the RB IDs of SRB1 to 3 correspond to 1 to 3, and the RB IDs of DRB1 to 32 correspond to 4 to 35; or,

[0649] Another possible implementation is to restrict SRB data and DRB data from being reused on the same RLC bearer. In this case, the first terminal device and the second terminal device can know whether the data on different RLC bearers is SRB data or DRB data based on the configuration of the access network device.

[0650] The above mainly describes the solution provided in this application from the perspective of interaction between various network elements. It is understood that, in order to achieve the above functions, each network element includes corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0651] This application embodiment can divide the first terminal device, second terminal device, access network device, etc., into functional modules according to the above method example. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0652] In the case of using integrated units, see Figure 14 , Figure 14 This is a schematic diagram of a communication device provided in an embodiment of this application. The communication device 1400 can be applied to the above-described... Figures 5A-12 In the method shown, such as Figure 14As shown, the communication device 1400 includes a processing module 1401 and a transceiver module 1402. The processing module 1401 may be one or more processors, and the transceiver module 1402 may be a transceiver or a communication interface. This communication device can be used to implement the functions of the first terminal device, the second terminal device, or the access network device involved in any of the above method embodiments, or to implement the functions of the network elements involved in any of the above method embodiments. The network element or network function may be a network component in a hardware device, a software function running on dedicated hardware, or a virtualized function instantiated on a platform (e.g., a cloud platform). Optionally, the communication device 1400 may further include a storage module 1403 for storing the program code and data of the communication device 1400.

[0653] In one example, when the communication device functions as a first terminal device or is a chip applied within a first terminal device, it executes the steps performed by the first terminal device in the above method embodiments. The transceiver module 1402 supports communication with a second terminal device or access network device, etc. The transceiver module 1402 is also used for communication between different protocol layer entities within the first terminal device, such as through... Figures 5A-8B The transceiver module 1402 performs the sending and / or receiving actions through the first adaptation layer entity of the first terminal device. Specifically, the transceiver module 1402 is used to perform one or more of steps 501, 601, 701, and 801, and / or other processes using the techniques described herein, through the first adaptation layer entity of the first terminal device. Additionally, the transceiver module 1402 is used to... Figures 5A-8B The transmitting and / or receiving actions performed by the second adaptation layer entity of the first terminal device, for example, the transceiver module 1402 is used to perform one or more of steps 502, 602, 702, and 802 through the second adaptation layer entity of the first terminal device, and / or other processes using the techniques described herein. The processing module 1401 can be used to support the communication device 1400 in performing the processing actions in the above method embodiments. For example, the processing module 1401 is used to perform the processing actions described herein through the first adaptation layer entity or the second adaptation layer entity of the first terminal device.

[0654] In one example, when the communication device functions as a second terminal device or is a chip applied in a second terminal device, it executes the steps performed by the second terminal device in the above method embodiments. The transceiver module 1402 supports communication with the first terminal device or access network equipment, etc. The transceiver module 1402 is also used for communication between different protocol layer entities in the second terminal device, such as through... Figures 9-10The transceiver module 1402 performs the sending and / or receiving actions through the adapter layer entity of the second terminal device. Specifically, the transceiver module 1402 is used to perform one or more of steps 901, 902, and 1002, and / or other processes using the techniques described herein, through the adapter layer entity of the second terminal device. The processing module 1401 can be used to support the communication device 1400 in performing the processing actions in the above method embodiments. For example, the processing module 1401 is used to perform the sending and / or receiving actions through the adapter layer entity of the second terminal device. Figure 10 Step 1001.

[0655] In one example, when the communication device functions as an access network device or is a chip applied within an access network device, it executes the steps performed by the access network device in the above method embodiments. The transceiver module 1402 supports communication with the first terminal device, etc., and is also used for communication between different protocol layer entities within the access network device, such as through... Figures 11-12 The transmission and / or reception actions performed by the adaptation layer entity of the access network device, such as supporting the access network device's adaptation layer entity to perform one or more of steps 1102, 1201, and 1202, and / or other processes using the techniques described herein. The processing module 1401 can be used to support the communication device 1400 in performing the processing actions in the above method embodiments. For example, the processing module 1401 is used to perform... Figure 11 Step 1101.

[0656] In one possible implementation, when the first terminal device, the second terminal device, or the access network device is a chip, the transceiver module 1402 can be an interface, pin, or circuit, etc. The interface can be used to input data to be processed to the processor and can output the processor's processing results. Specifically, the interface can be a general purpose input / output (GPIO) interface, which can connect to multiple peripheral devices (such as displays (LCDs), cameras, radio frequency (RF) modules, antennas, etc.). The interface is connected to the processor via a bus.

[0657] Processing module 1401 may be a processor, which can execute computer execution instructions stored in the storage module to cause the chip to perform... Figures 5A to 12 The methods involved in the embodiments.

[0658] Furthermore, a processor may include a controller, an arithmetic logic unit (ALU), and registers. For example, the controller is primarily responsible for instruction decoding and issuing control signals for the operations corresponding to the instructions. The ALU is primarily responsible for performing fixed-point or floating-point arithmetic operations, shift operations, and logical operations, and can also perform address operations and translations. Registers are primarily responsible for storing register operands and intermediate operation results temporarily stored during instruction execution. In specific implementations, the processor's hardware architecture can be an application-specific integrated circuit (ASIC) architecture, a microprocessor without interlocked piped stages architecture (MIPS) architecture, an advanced reduced instruction set machine (RISC) machine (ARM) architecture, or a network processor (NP) architecture, etc. The processor can be single-core or multi-core.

[0659] The storage module can be an internal storage module of the chip, such as a register or cache. Alternatively, the storage module can be an external storage module, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, such as random access memory (RAM).

[0660] It should be noted that the functions of the processor and interface can be implemented through hardware design, software design, or a combination of both; no restrictions are imposed here.

[0661] Figure 15 This is a simplified structural diagram of a terminal device provided for embodiments of this application. It is intended for ease of understanding and illustration. Figure 15 In this context, using a mobile phone as an example of a terminal device is understandable. Figure 15 The terminal device involved can be either a first terminal device or a second terminal device; there is no restriction on this. For example... Figure 15As shown, the terminal device includes at least one processor, and may also include radio frequency (RF) circuitry, an antenna, and input / output devices. The processor can be used to process communication protocols and communication data, control the terminal device, execute software programs, and process data from the software programs. The terminal device may also include a memory, primarily used to store software programs and data. These programs can be loaded into the memory at the time of manufacture or added later when needed. The RF circuitry is mainly used for converting baseband signals to RF signals and processing RF signals. The antenna is mainly used for transmitting and receiving RF signals in the form of electromagnetic waves, and the antenna is the one provided in this embodiment. Input / output devices, such as touchscreens, displays, and keyboards, are mainly used to receive user input data and output data to the user. It should be noted that some types of terminal devices may not have input / output devices.

[0662] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency (RF) circuit. The RF circuit then processes the baseband signal and transmits it outward as electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts it into a baseband signal, and outputs the baseband signal to the processor. The processor then converts the baseband signal back into data and processes it. For ease of explanation, Figure 15 Only one memory and processor are shown in the illustration. In actual terminal device products, there may be one or more processors and one or more memories. Memory may also be referred to as storage medium or storage device, etc. Memory may be set up independently of the processor or integrated with the processor; this application does not limit this.

[0663] In the embodiments of this application, the antenna and radio frequency circuit with transceiver functions can be regarded as the receiving unit and transmitting unit (or collectively referred to as the transceiver unit) of the terminal device, and the processor with processing functions can be regarded as the processing unit of the terminal device. Figure 15 As shown, the terminal device includes a receiving module 31, a processing module 32, and a transmitting module 33. The receiving module 31 can also be called a receiver, receiver circuit, etc., and the transmitting module 33 can also be called a transmitter, transmitter, transmitter circuit, etc. The processing module 32 can also be called a processor, processing board, processing device, etc.

[0664] For example, processing module 32 is used to execute Figures 5A-8A The functions of the first terminal device in any of the embodiments shown.

[0665] Figure 16This is a simplified structural diagram of an access network device provided in an embodiment of this application. The access network device includes a radio frequency (RF) signal transceiver and conversion section and a 42 section. The RF signal transceiver and conversion section further includes a receiving module 41 and a transmitting module 43 (which can also be collectively referred to as transceiver modules). The RF signal transceiver and conversion section is mainly used for transmitting and receiving RF signals and converting RF signals to baseband signals; the 42 section is mainly used for baseband processing and controlling the access network device. The receiving module 41 can also be called a receiver, receiver circuit, etc., and the transmitting module 43 can also be called a transmitter, transmitter, transmitter circuit, etc. The 42 section is usually the control center of the access network device, and can often be called a processing module, used to control the access network device to perform the above-mentioned tasks. Figures 11-12 The steps performed by the access network equipment are described in detail in the relevant sections above.

[0666] Part 42 may include one or more single boards, each single board may include one or more processors and one or more memories, the processors are used to read and execute programs in the memories to implement baseband processing functions and control access network devices. If multiple single boards exist, the single boards can be interconnected to increase processing power. As an optional implementation, multiple single boards may share one or more processors, or multiple single boards may share one or more memories, or multiple single boards may simultaneously share one or more processors.

[0667] For example, for access network devices, the sending module 43 is used to perform... Figures 11-12 The functions of the access network device in any of the embodiments shown.

[0668] This application embodiment also provides a communication device, including a processor, a memory, an input interface, and an output interface. The input interface is used to receive information from other communication devices outside the communication device, and the output interface is used to output information to other communication devices outside the communication device. The processor calls a computer program stored in the memory to implement... Figures 5A-12 Any of the embodiments shown.

[0669] This application embodiment also provides a computer-readable storage medium storing a computer program, which, when executed, implements... Figures 5A-12 Any of the embodiments shown.

[0670] This application also provides a computer program product that, when read and executed by a computer, causes the computer to perform the following: Figures 5A-12 Any of the embodiments shown.

[0671] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the objectives of the embodiments of this application, depending on actual needs. Furthermore, the network element units in the various embodiments of this application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The integrated units described above can be implemented in hardware or as software network element units.

[0672] If the integrated units described above are implemented as software network elements and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, 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, cloud server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. The above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A data transmission method, characterized in that, The method, executed by a first terminal device or a chip applied in the first terminal device, includes: The first adaptation layer entity of the first terminal device delivers the first data and the first indication information to the second adaptation layer entity of the first terminal device. The first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data. The first data comes from the first radio link control (RLC) bearer. The first data is either signaling radio bearer (SRB) data or data radio bearer (DRB) data. The first RLC bearer is used for communication between the first terminal device and the access network device, and is used to transmit data corresponding to at least one terminal device from the access network device or to transmit data from the at least one terminal device. The second terminal device is one of the at least one terminal devices. The SRB data and the DRB data cannot be reused in the first RLC bearer. The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first instruction information. The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device. The SRB data and the DRB data cannot be reused in the second RLC bearer.

2. The method according to claim 1, characterized in that, The method further includes: The first terminal device determines the first data as either SRB data or DRB data based on the configuration information of the access network device. The configuration information of the access network device includes the association between the first RLC bearer and the SRB or DRB.

3. The method according to claim 1, characterized in that, The first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device.

4. The method according to any one of claims 1-3, characterized in that, The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the first instruction information, including: The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence. The first correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

5. The method according to claim 4, characterized in that, If the first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device, the method further includes: The second adaptation layer entity of the first terminal device determines the sidelink based on the identifier of the second terminal device and the second correspondence; the sidelink is the sidelink between the first terminal device and the second terminal device, and at least one RLC bearer corresponds to the sidelink; the second correspondence includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device; The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including: The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

6. The method according to claim 4, characterized in that, The method further includes: The second adaptation layer entity of the first terminal device generates second data; the second data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer, or the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device; The second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including: The second adaptation layer entity of the first terminal device delivers the second data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence.

7. The method according to claim 6, characterized in that, The method further includes: The first adaptation layer entity of the first terminal device determines the identification information of the unicast connection on the side link based on the identifier of the second terminal device and the second correspondence. The second correspondence includes the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

8. The method according to any one of claims 1-3 or 5-7, characterized in that, The method further includes: The first terminal device receives first configuration information from the access network device. The first configuration information includes one or more of the following: a first correspondence, a second correspondence, and a third correspondence. The first configuration information is used to indicate one or more of the following: The first correspondence is the configuration information of the second adaptation layer of the first terminal device; The second correspondence is the configuration information of the first adaptation layer of the first terminal device and / or the second adaptation layer of the first terminal device; The third correspondence is the configuration information of the second adaptation layer of the first terminal device; The first correspondence is the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer. The second correspondence includes the correspondence between the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device. The third correspondence includes the correspondence between the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the identifier of the second RLC bearer.

9. A data transmission method, characterized in that, The method is executed by a first terminal device or a chip applied in the first terminal device, the method comprising: The first terminal device communicates with the access network device using a first radio link control (RLC) bearer. The first RLC bearer is used to transmit data from at least one terminal device corresponding to the access network device and / or the first RLC bearer is used to transmit data from the at least one terminal device. The first adaptation layer entity of the first terminal device delivers the first data and the first indication information to the second adaptation layer entity of the first terminal device. The first indication information is used to indicate the radio bearer corresponding to the second terminal device that transmits the first data. The second terminal device is a terminal device among the at least one terminal device. The first data comes from the second radio link control (RLC) bearer. The first data is signaling radio bearer (SRB) data or data radio bearer (DRB) data. The second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device. The SRB data and the DRB data cannot be reused in the second RLC bearer. The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first instruction information. The SRB data and the DRB data cannot be reused in the first RLC bearer. The first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device.

10. The method according to claim 9, characterized in that, The method further includes: The first terminal device determines the first data as either SRB data or DRB data based on the configuration information of the access network device. The configuration information of the access network device includes the association between the second RLC bearer and the SRB or DRB.

11. The method according to claim 9, characterized in that, If the first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device, the method further includes: The first adaptation layer entity of the first terminal device determines the identifier of the second terminal device based on the identifier information of the unicast connection on the side link and the first correspondence relationship; the side link is the side link that transmits the first data, and the first correspondence relationship is the correspondence between the identifier information of the unicast connection on the side link and the identifier of the second terminal device.

12. The method according to claim 9, characterized in that, The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the first instruction information, including: The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence. The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

13. The method according to claim 12, characterized in that, The method further includes: The second adaptation layer entity of the first terminal device generates second data; the second data includes the first data and second indication information; the second indication information includes the identifier of the radio bearer and the identifier of the second terminal device; The second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including: The second adaptation layer entity of the first terminal device delivers the second data to the first RLC bearer based on the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

14. The method according to claim 9 or 13, characterized in that, The method further includes: The first terminal device receives first configuration information from the access network device; the first configuration information includes one or more of the following: a first correspondence relationship, a second correspondence relationship; the first configuration information is used to indicate one or more of the following: The first correspondence is the configuration information of the first adaptation layer and / or the second adaptation layer of the first terminal device; The second correspondence is the configuration information of the second adaptation layer of the first terminal device; The first correspondence is the correspondence between the identifier information of the unicast connection on the side link and the identifier of the second terminal device. The second correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

15. A data transmission method, characterized in that, The method, executed by a second terminal device or a chip applied in a second terminal device, includes: The adaptation layer entity of the second terminal device receives second data from the radio link control (RLC) bearer of the second terminal device; the second data includes second indication information, which is used to indicate the radio bearer corresponding to the second terminal device receiving the second data; the second data is signaling radio bearer (SRB) data or data radio bearer (DRB) data, and the SRB data and the DRB data cannot be reused in the RLC bearer of the second terminal device. The adaptation layer entity of the second terminal device delivers the second data to the Packet Data Convergence Protocol (PDCP) layer entity of the second terminal device according to the second instruction information.

16. The method according to claim 15, characterized in that, The method further includes: The second terminal device determines the second data as either SRB data or DRB data based on the configuration information of the access network device. The configuration information of the access network device includes the association between the RLC bearer of the second terminal device and the SRB or DRB.

17. The method according to claim 15, characterized in that, If the second indication information includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the second indication information, including: The adaptation layer entity of the second terminal device delivers the second data to the PDCP layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence; The first correspondence includes the correspondence between the identifier of the wireless bearer and the identifier of the PDCP layer entity of the second terminal device.

18. A data transmission method, characterized in that, The method, executed by a second terminal device or a chip applied in the second terminal device, includes: The adaptation layer entity of the second terminal device generates second data; the second data includes first data and second indication information, the first data is data received by the adaptation layer entity of the second terminal device from the Packet Data Convergence Protocol (PDCP) layer entity of the second terminal device, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device that receives the second data. The adaptation layer entity of the second terminal device delivers the second data to the radio link control (RLC) bearer of the second terminal device according to the second instruction information. The second data is signaling radio bearer (SRB) data or data radio bearer (DRB) data. The SRB data and the DRB data cannot be reused in the RLC bearer of the second terminal device.

19. The method according to claim 18, characterized in that, If the second indication information includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the second indication information, including: The adaptation layer entity of the second terminal device delivers the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer and the first correspondence; The first correspondence includes the correspondence between the identifier of the wireless bearer and the identifier of the RLC bearer of the second terminal device.

20. The method according to claim 18 or 19, characterized in that, The method further includes: The second terminal device receives first configuration information from the access network device. The first configuration information includes the following: a first correspondence and a second correspondence. The first configuration information is used to indicate that the first correspondence or the second correspondence is the configuration information of the adaptation layer of the second terminal device. The first correspondence includes the correspondence between the identifier of the radio bearer and the identifier of the RLC bearer of the second terminal device; The second correspondence includes the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device, and the identifier of the RLC bearer of the second terminal device.

21. A data transmission method, characterized in that, The method, executed by an access network device or a chip applied in the access network device, includes: The adaptation layer entity of the access network device generates second data; the second data includes first data and second indication information, the first data is data received by the adaptation layer entity of the access network device from the Packet Data Convergence Protocol (PDCP) layer entity of the access network device, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device that receives the second data. The adaptation layer entity of the access network device delivers the second data to the Radio Link Control (RLC) bearer of the access network device according to the second instruction information. The second data is either Signaling Radio Bearer (SRB) data or Data Radio Bearer (DRB) data. The SRB data and the DRB data cannot be reused in the RLC bearer of the access network device.

22. The method according to claim 21, characterized in that, The second indication information includes the identifier of the radio bearer and the identifier of the second terminal device. The adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the second indication information, including: The adaptation layer entity of the access network device delivers the second data to the RLC bearer of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence; The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the RLC bearer of the access network device.

23. A data transmission method, characterized in that, The method, executed by an access network device or a chip applied in the access network device, includes... The adaptation layer entity of the access network device receives second data from the radio link control (RLC) bearer of the access network device; the second data includes second indication information, which is used to indicate the radio bearer corresponding to the second terminal device receiving the second data; the second data is signaling radio bearer (SRB) data or data radio bearer (DRB) data, and the SRB data and the DRB data cannot be reused in the RLC bearer of the access network device. The adaptation layer entity of the access network device delivers the second data to the packet data aggregation protocol (PDCP) layer entity of the access network device according to the second instruction information.

24. The method according to claim 23, characterized in that, The method further includes: The access network device determines the second data as either the SRB data or the DRB data based on its configuration information. The configuration information of the access network device includes the association between the access network device's RLC bearer and the SRB or DRB.

25. The method according to claim 23, characterized in that, The second indication information includes the identifier of the radio bearer and the identifier of the second terminal device. The adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the second indication information, including: The adaptation layer entity of the access network device delivers the second data to the PDCP layer entity of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence. The first correspondence includes the correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the PDCP layer entity of the access network device.

26. A communication device, characterized in that, The method includes a processor and a memory, wherein the processor invokes a computer program stored in the memory to implement the method as described in any one of claims 1-8, or the method as described in any one of claims 9-14, or the method as described in any one of claims 15-17, or the method as described in any one of claims 18-20, or the method as described in any one of claims 21-22, or the method as described in any one of claims 23-25.

27. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when the computer program is run, implements the method as claimed in any one of claims 1-8, or the method as claimed in any one of claims 9-14, or the method as claimed in any one of claims 15-17, or the method as claimed in any one of claims 18-20, or the method as claimed in any one of claims 21-22, or the method as claimed in any one of claims 23-25.

28. A computer program product, characterized in that, The computer program product includes instructions or programs that, when executed on a computer, implement the method of any one of claims 1-8, or the method of any one of claims 9-14, or the method of any one of claims 15-17, or the method of any one of claims 18-20, or the method of any one of claims 21-22, or the method of any one of claims 23-25.

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