Data transmission method and related device

Abstract

The invention provides a data transmission method and a related device. A first adaptation layer entity of first terminal equipment can submit first data and first indication information to a second adaptation layer entity of the first terminal equipment; thus, the second adaptation layer entity of the first terminal device can correctly submit the first data to the second RLC bearer according to the first indication information, and the reliability of downlink data transmission is improved.

Description

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

[0002] The present application relates to the field of communication technology, and in particular to a data transmission method and related devices. Background Art

[0003] At present, in relay technology, a remote terminal device can communicate with a base station through a relay terminal device. For example, a data packet of a remote terminal device can be relayed and forwarded on a radio link control (RLC) bearer of a relay terminal device, wherein an RLC bearer may include a radio link control (RLC) layer entity and a logical channel of a media access control (MAC) layer. It is understandable that in relay technology, an adaptation (Adaptation, Adapt) layer may be added between the RLC layer and the packet data convergence protocol (PDCP) layer to realize the multiplexing and demultiplexing of the bearer. That is, data on at least one radio bearer supporting different remote terminal devices can be multiplexed on one RLC bearer or data on one RLC bearer can be split into different radio bearers.

[0004] However, in the existing protocol design, when the base station configures the RLC bearer, one RLC bearer corresponds to one PDCP entity or one radio bearer (RB), that is, the multiplexing and demultiplexing of the bearer are not supported. Therefore, when there is radio bearer (RB) multiplexing and demultiplexing, it may cause the problem that the downlink data of the remote terminal device cannot be delivered correctly. Therefore, in the scenario of RB multiplexing and demultiplexing, how to deliver downlink data correctly has become a technical problem that needs to be solved urgently at the current stage. Summary of the invention

[0005] The present application provides a data transmission method and related devices, which realize 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, where the first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data, and the second terminal device is a terminal device in the at least one terminal device;

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

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

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

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

[0012] It can be seen that in the above technical solution, the first adaptation layer entity of the first terminal device delivers the first indication information 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 first data to the correct RLC bearer.

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

[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 corresponding relationship;

[0015] The first corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the second RLC bearer.

[0016] It can be seen that 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, 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.

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

[0018] The second adaptation layer entity of the first terminal device determines a side link according to an identifier of the second terminal device and a second corresponding relationship; the side link is a side link between the first terminal device and the second terminal device, and the side link corresponds to at least one RLC bearer; the second corresponding relationship includes a corresponding relationship between the identifier information of the unicast connection on the side link 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 according to the identifier of the radio bearer, the identifier of the second terminal device and the first corresponding relationship, including:

[0020] 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 corresponding relationship.

[0021] It can be seen that in the above technical scheme, when the first adaptation layer entity of the first terminal device delivers the identifier of the wireless 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; further, the first data can be delivered to the second RLC bearer in at least one RLC bearer based on the identifier of the wireless 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 information of the unicast connection on the sidelink, 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, 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 corresponding relationship, including:

[0023] 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 corresponding relationship.

[0024] It can be seen that in the above technical scheme, when the first adaptation layer entity of the first terminal device delivers the identifier of the wireless 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; further, according to the identifier of the wireless bearer, the identifier of the second terminal device and the first corresponding relationship, the first data is delivered to the second RLC bearer in at least one 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.

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

[0026] It can be seen that in the above technical solution, when the first adaptation layer entity of the first terminal device delivers the identification information of the wireless bearer and 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 identification 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 corresponding relationship, including:

[0030] The second adaptation layer entity of the first terminal device delivers the second 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 corresponding relationship.

[0031] It can be seen that 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 an identifier of the radio bearer and identification information of a unicast connection on a sidelink, and the sidelink is a 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 according to the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink and the third corresponding relationship;

[0034] The third corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identification information of the unicast connection on the sidelink and the identifier of the second RLC bearer.

[0035] It can be seen that in the above technical scheme, when the first adaptation layer entity of the first terminal device delivers the identifier of the wireless bearer and the identification 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; further, the first data is delivered to the second RLC bearer according to the identifier of the wireless bearer, the identification information of the unicast connection on the side link and the third corresponding relationship, 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.

[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 according to the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third corresponding relationship, including:

[0039] The second adaptation layer entity of the first terminal device delivers 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 corresponding relationship.

[0040] It can be seen that in the above technical solution, the second adaptation layer entity of the first terminal device delivers the third 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.

[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 sidelink according to the identification of the second terminal device and the second corresponding relationship;

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

[0044] It can be seen that in the above technical solution, the conversion between the identification information of the second terminal device and the identification information of the unicast connection on the side link is realized.

[0045] Optionally, the method further includes:

[0046] The first terminal device receives first configuration information from the access network device, where 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:

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

[0048] The second corresponding relationship is configuration information of the first adaptation layer of the first terminal device and / or the second adaptation layer of the first terminal device;

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

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

[0051] It can be seen that in the above technical solution, the first terminal device receives the first configuration information from the access network device, so that the first terminal device can 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, where the first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data, and the second terminal device is a terminal device in 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 indication information.

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

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

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

[0058] It can be seen that in the above technical solution, the first adaptation layer entity of the first terminal device delivers the first indication information 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 first data to the correct RLC bearer.

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

[0060] The first adaptation layer entity of the first terminal device determines the identification of the second terminal device based on the identification information of the unicast connection on the side link and the first corresponding relationship; the side link is a side link for transmitting the first data, and the first corresponding relationship is the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

[0061] It can be seen that in the above technical solution, the conversion between the identification information of the second terminal device and the identification information of the unicast connection on the side link is realized.

[0062] Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of a unicast connection on a sidelink, and the sidelink is a 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 identification of the second terminal device based on the identification information of the unicast connection on the side link and the first correspondence; the side link is a side link for transmitting the first data, and the first correspondence is the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

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

[0065] Optionally, 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 includes:

[0066] 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 corresponding relationship;

[0067] The second corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0068] It can be seen that 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 wireless bearer, the identifier of the second terminal device and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby 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 according to the identifier of the radio bearer, the identifier of the second terminal device, and the second corresponding relationship, including:

[0072] 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 second corresponding relationship.

[0073] It can be seen that 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 wireless bearer, the identifier of the second terminal device and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, 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 corresponding relationship and a second corresponding relationship; the first configuration information is used to indicate one or more of the following:

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

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

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

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

[0080] In a third aspect, 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 a radio link control RLC bearer of the second terminal device; the second data includes second indication information, and the second indication information 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 indication information.

[0083] It can be seen that 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 indication 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 corresponding relationship;

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

[0087] It can be seen that 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 wireless bearer and the first corresponding relationship, 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] In a fourth aspect, 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 receiving 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 indication information.

[0091] It can be seen that in the above technical solution, the adaptation layer entity of the second terminal device generates second data, and the second data includes first data and second indication information, so that the adaptation layer entity of the second terminal device can 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 an 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 corresponding relationship;

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

[0095] It can be seen that 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 wireless bearer and the first corresponding relationship, 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.

[0096] Optionally, the method further includes:

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

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

[0099] The second corresponding relationship includes a corresponding relationship 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.

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

[0101] In a fifth aspect, 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 receiving 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 indication information.

[0104] It can be seen that in the above technical solution, the adaptation layer entity of the access network device generates second data, and the second data includes first data and second indication information, so that the adaptation layer entity of the access network device can 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 an identifier of the radio bearer and an identifier of the second terminal device, and 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 corresponding relationship;

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

[0108] It can be seen that in the above technical scheme, 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, 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] A sixth aspect provides a data transmission method, 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, and the second indication information 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 Convergence Protocol PDCP layer entity of the access network device according to the second indication information.

[0112] It can be seen that 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, so that the adaptation layer entity of the access network device can correctly deliver the first data to the PDCP layer entity of the access network device according to the second indication information, thereby improving the reliability of uplink data transmission.

[0113] Optionally, the second indication information includes an identifier of a radio bearer and an identifier of a second terminal device, and the adaptation layer entity of the access network device delivers the second data to a 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 corresponding relationship;

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

[0116] It can be seen that in the above technical scheme, 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, 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.

[0117] In a seventh 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:

[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 that transmits the first data, the second indication information is used to indicate the radio bearer, and the second terminal device is a terminal device in the at least one terminal device;

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

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

[0121] Optionally, the first indication information is an 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 adaptation layer entity of the first terminal device determines the second adaptation layer entity of the first terminal device from a plurality of adaptation layer entities according to the identifier of the second terminal device and the first corresponding relationship;

[0123] 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;

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

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

[0126] a correspondence between the identifier of the second terminal device and the identifier information of the unicast connection on the sidelink, the sidelink being the sidelink 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] It can be seen that in the above technical scheme, the first adaptation layer entity of the first terminal device determines the second adaptation layer entity of the first terminal device from multiple adaptation layer entities according to the identifier of the second terminal device and the first corresponding relationship, so that the first adaptation layer entity of the first terminal device can deliver the first data and the second indication information to the second adaptation layer entity of the first terminal device, thereby enabling the first adaptation layer entity of the first terminal device to correctly deliver the downlink data.

[0129] Optionally, the second indication information includes an identifier of a radio bearer, and the second adaptation layer entity of the first terminal device delivers the first data to a 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 wireless bearer and the second corresponding relationship; the second corresponding relationship 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.

[0131] It can be seen that 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 wireless bearer and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the downlink data, thereby improving the reliability of downlink data transmission.

[0132] Optionally, the second indication information further includes an identifier of the second terminal device, and 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 corresponding relationship, including:

[0133] 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 corresponding relationship.

[0134] It can be seen that 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 wireless bearer, the identifier of the second terminal device and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the downlink data, thereby 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 according to the identifier of the radio bearer, the identifier of the second terminal device and the second corresponding relationship, including:

[0138] The second adaptation layer entity of the first terminal device delivers 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 corresponding relationship.

[0139] It can be seen that in the above technical solution, the second adaptation layer entity of the first terminal device delivers the second data to the second RLC bearer according to the identifier of the wireless bearer, the identifier of the second terminal device and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the downlink data, thereby 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 corresponding relationship and a second corresponding relationship;

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

[0143] The first corresponding relationship is configuration information of a first adaptation layer of the first terminal device;

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

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

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

[0147] a correspondence between an identifier of the second terminal device and identifier information of a unicast connection on a sidelink, the sidelink being a sidelink between the first terminal device and the second terminal device, and the sidelink corresponding to the second adaptation layer entity;

[0148] The second corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the second RLC bearer.

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

[0150] In an eighth 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:

[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 a radio bearer, and the second terminal device is a terminal device in 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 indication information.

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

[0154] Optionally, the method further includes:

[0155] The first adaptation layer entity of the first terminal device determines the identifier of the second terminal device according to the second indication information and the second corresponding relationship;

[0156] The first adaptation layer entity of the first terminal device submits the identifier of the second terminal device to the second adaptation layer entity of the first terminal device;

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

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

[0159] A correspondence between an identifier of the first adaptation layer entity of the first terminal device and an 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] It can be seen that in the above technical scheme, when the first adaptation layer entity of the first terminal device does not obtain the identification of the second terminal device, the first adaptation layer entity of the first terminal device determines the identification of the second terminal device based on the second indication information and the second correspondence, thereby realizing the conversion of the second indication information and the identification 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 according to the third indication information and the third corresponding relationship;

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

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

[0166] A correspondence between an identifier of the second adaptation layer entity of the first terminal device and an 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] It can be seen that in the above technical scheme, when the first adaptation layer entity of the first terminal device does not submit the identification 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 determines the identification of the second terminal device based on the second indication information and the third correspondence, thereby realizing the conversion of the second indication information and the identification of the second terminal device.

[0169] Optionally, the first indication information includes an 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 according to the identifier of the radio bearer, the identifier of the second terminal device and the first corresponding relationship;

[0171] The first corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0172] It can be seen that 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby 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 according to the identifier of the radio bearer, the identifier of the second terminal device and the first corresponding relationship, including:

[0176] 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 corresponding relationship.

[0177] It can be seen that 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, 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 corresponding relationship, a second corresponding relationship, and a third corresponding relationship;

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

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

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

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

[0184] The first corresponding relationship includes a corresponding relationship between an identifier of the radio bearer, an identifier of the second terminal device, and an identifier of the first RLC bearer;

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

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

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

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

[0189] A correspondence between an identifier of the second adaptation layer entity of the first terminal device and an 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] It can be seen that in the above technical solution, the first terminal device receives the second configuration information from the access network device, so that the first terminal device can correctly deliver data between different protocol layer entities according to the second configuration information, thereby improving the reliability of data transmission.

[0192] In a ninth aspect, a communication device is provided, wherein the communication device is a first terminal device, wherein the first terminal device uses a first radio link control RLC bearer when communicating with an access network device, wherein 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, wherein the first terminal device includes a transceiver module,

[0193] The transceiver module is used to deliver the first data and the first indication information to the second adaptation layer entity of the first terminal device through the first adaptation layer entity of the first terminal device, wherein the first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data, and the second terminal device is a terminal device in the at least one terminal device;

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

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

[0196] The first indication information includes an identifier of the wireless bearer and identifier information of a unicast connection on a sidelink, and the sidelink is a 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship;

[0198] The first corresponding relationship includes the corresponding relationship between the identifier of the radio 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 wireless bearer and the identifier of the second terminal device, the first terminal device also includes a processing module, and the processing module is used to determine the side link through the second adaptation layer entity of the first terminal device according to the identifier of the second terminal device and the first corresponding relationship; the side link is a side link between the first terminal device and the second terminal device, and the side link corresponds to at least one RLC bearer; the first corresponding relationship includes the correspondence between the identification information of the unicast connection on the side link 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 wireless 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 according to the identifier of the wireless bearer, the identifier of the second terminal device and the first correspondence through the second adaptation layer entity of the first terminal device.

[0201] Optionally, if the first indication information includes the identifier of the wireless bearer and the identifier information of the unicast connection on the side link, the side link is a side link between the first terminal device and the second terminal device, and the side link 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 wireless 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 wireless bearer, the identifier of the second terminal device and the first correspondence.

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

[0203] Optionally, the first terminal device further includes a processing module, and the processing module is used 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 wireless 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 according to the identifier of the wireless bearer, the identifier of the second terminal device and the first correspondence through the second adaptation layer entity of the first terminal device.

[0205] Optionally, if the first indication information includes the identifier of the wireless bearer and the identifier information of the unicast connection on the sidelink, and 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 wireless bearer, the identifier information of the unicast connection on the sidelink and a third corresponding relationship;

[0206] The third corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identification information of the unicast connection on the sidelink and the identifier of the second RLC bearer.

[0207] Optionally, the first terminal device further includes a processing module, the processing module being 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 an 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 according to the identifier of the radio bearer, the identifier information of the unicast connection on the sidelink, and the third corresponding relationship, including:

[0209] The second adaptation layer entity of the first terminal device delivers 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 corresponding relationship.

[0210] Optionally, the first terminal device further includes a processing module, and the processing module is further used to determine the identification information of the unicast connection on the sidelink according to the identification of the second terminal device and the second corresponding relationship through the first adaptation layer entity of the first terminal device;

[0211] The second correspondence includes a 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 used to receive first configuration information from the access network device, where the first configuration information includes one or more of the following: a first corresponding relationship, a second corresponding relationship, and a third corresponding relationship, and the first configuration information is used to indicate one or more of the following:

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

[0214] The second corresponding relationship is configuration information of the first adaptation layer of the first terminal device and / or the second adaptation layer of the first terminal device;

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

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

[0217] In a tenth aspect, a communication device is provided, wherein the communication device is a first terminal device, wherein the first terminal device uses a first radio link control RLC bearer when communicating with an access network device, wherein 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, wherein the first terminal device includes a transceiver module,

[0218] The transceiver module is used to deliver the first data and the first indication information to the second adaptation layer entity of the first terminal device through the first adaptation layer entity of the first terminal device, wherein the first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data, and the second terminal device is a terminal device in the at least one terminal device;

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

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

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

[0222] Optionally, if the first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device, the first terminal device also includes a processing module, and the processing module is used to determine the identifier of the second terminal device according to the identifier information of the unicast connection on the sidelink and a first correspondence through the first adaptation layer entity of the first terminal device; the sidelink is a sidelink for transmitting the first data, and the first correspondence 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 wireless bearer and the identifier information of the unicast connection on the sidelink, the sidelink is a sidelink between the first terminal device and the second terminal device, and the first terminal device also includes a processing module, and the processing module is used to determine the identifier of the second terminal device according to the identifier information of the unicast connection on the sidelink and the first correspondence through the second adaptation layer entity of the first terminal device; the sidelink is a sidelink for transmitting the first data, and the first correspondence is the correspondence between the identifier information 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 wireless bearer, the identifier of the second terminal device and the second corresponding relationship;

[0225] The second corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0226] Optionally, the processing module is further used 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 wireless 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 wireless bearer, the identifier of the second terminal device and the second correspondence.

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

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

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

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

[0232] In an eleventh aspect, a communication device is provided, wherein the communication device is a second terminal device, and the second terminal device includes a transceiver module.

[0233] The transceiver module is used to receive second data from a radio link control RLC bearer of the second terminal device through an adaptation layer entity of the second terminal device; the second data includes second indication information, and the second indication information 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 through the adaptation layer entity of the second terminal device according to the second indication information.

[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;

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

[0237] In a twelfth aspect, a communication device is provided, wherein the communication device is a second terminal device, and the second terminal device includes 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 receiving 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 indication information.

[0240] Optionally, if the second indication information includes the identifier of the wireless 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 wireless bearer and the first corresponding relationship;

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

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

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

[0244] The second corresponding relationship includes a corresponding relationship 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.

[0245] In a thirteenth aspect, a communication device is provided, wherein the communication device is an access network device, and the access network device includes 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 indication 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 an identifier of the radio bearer and an 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 corresponding relationship;

[0249] The first corresponding relationship includes the corresponding relationship between the identifier of the wireless 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, wherein the communication device is an access network device, and the access network device includes a transceiver module,

[0251] The transceiver module is used to receive second data from a radio link control RLC bearer of the access network device through an adaptation layer entity of the access network device; the RLC bearer of the access network device is an RLC bearer used when the access network device communicates with the first terminal device, and the second data includes second indication information, and the second indication information is used to indicate a radio bearer corresponding to a 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 through the adaptation layer entity of the access network device according to the second indication information.

[0253] Optionally, the second indication information includes an identifier of a radio bearer and an identifier of a 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 corresponding relationship;

[0254] The first corresponding relationship includes the corresponding relationship between the identifier of the wireless 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 device is provided, wherein the communication device is a first terminal device, wherein the first terminal device uses a first radio link control RLC bearer when communicating with an access network device, wherein 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, and the first terminal device includes a transceiver module,

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

[0257] The transceiver module is used to deliver the first data to a second RLC bearer through a second adaptation layer entity of the first terminal device according to the second indication information; the second RLC bearer is an 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 an identifier of the second terminal device, and 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 according to the identifier of the second terminal device and the first corresponding relationship through the first adaptation layer entity of the first terminal device;

[0259] The transceiver module is further used to deliver the first data and the second indication 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 corresponding relationship includes one or more of the following:

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

[0262] a correspondence between the identifier of the second terminal device and the identifier information of the unicast connection on the sidelink, the sidelink being the sidelink 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 an identifier of a wireless bearer. When the second adaptation layer entity of the first terminal device delivers the first data to a 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 wireless bearer and a second correspondence; the second correspondence includes a correspondence between the identifier of the wireless bearer, the identifier of the second terminal device and the identifier of the second RLC bearer.

[0265] Optionally, the second indication information also includes an 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 wireless 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 wireless bearer, the identifier of the second terminal device and the second correspondence.

[0266] Optionally, the first terminal device further includes a processing module, the processing module being 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 an identifier of the radio bearer, or the third indication information includes an identifier of the radio bearer and an 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 wireless 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 wireless bearer, the identifier of the second terminal device and the second correspondence.

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

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

[0270] The first corresponding relationship is configuration information of a first adaptation layer of the first terminal device;

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

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

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

[0274] a correspondence between an identifier of the second terminal device and identifier information of a unicast connection on a sidelink, the sidelink being a sidelink between the first terminal device and the second terminal device, and the sidelink corresponding to the second adaptation layer entity;

[0275] The second corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the second RLC bearer.

[0276] In the sixteenth aspect, a communication device is provided, wherein the communication device is a first terminal device, and 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, and the first terminal device includes a transceiver module, and 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 a wireless bearer, and the second terminal device is a terminal device among the at least one terminal device; 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.

[0277] Optionally, the first terminal device further includes a processing module, and the processing module is used to determine the identifier of the second terminal device according to the second indication information and the second corresponding relationship through the first adaptation layer entity of the first terminal device;

[0278] The transceiver module is used to submit 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: an identifier of the first adaptation layer entity, and identifier information of a unicast connection on a sidelink, where the sidelink is a sidelink between the first terminal device and the second terminal device;

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

[0281] A correspondence between an identifier of the first adaptation layer entity of the first terminal device and an 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, and the processing module is used to determine the identifier of the second terminal device according to the third indication information and the third corresponding relationship through the second adaptation layer entity of the first terminal device;

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

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

[0286] A correspondence between an identifier of the second adaptation layer entity of the first terminal device and an 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 an identifier of the radio bearer, and 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 corresponding relationship;

[0289] The first corresponding relationship includes the corresponding relationship between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

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

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

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

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

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

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

[0297] The first corresponding relationship includes a corresponding relationship between an identifier of the radio bearer, an identifier of the second terminal device, and an identifier of the first RLC bearer;

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

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

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

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

[0302] A correspondence between an identifier of the second adaptation layer entity of the first terminal device and an 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 the seventeenth aspect, a communication device is provided, comprising a processor and a memory, wherein the processor calls a computer program stored in the memory to implement a method as described in any one of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, the sixth aspect, the seventh aspect or the eighth aspect.

[0305] In one possible design, the communication device may be a chip that implements the method in the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, the sixth aspect, the seventh aspect or the eighth aspect, or a device including a chip.

[0306] In the eighteenth aspect, a computer-readable storage medium is provided, wherein a computer program is stored in the computer-readable storage medium. When the computer program is executed, the method described in any one of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, the sixth aspect, the seventh aspect or the eighth aspect is implemented.

[0307] In the nineteenth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the method described in any one of the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, the sixth aspect, the seventh aspect or the eighth aspect to be executed.

[0308] In the twentieth aspect, a communication system is provided, which includes one or more of the following: the above-mentioned first terminal device, the above-mentioned second terminal device, and the above-mentioned access network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0309] The following is a brief introduction to the drawings required for describing the embodiments or the prior art.

[0310] in:

[0311] Figure 1 The control plane protocol stack involved in the communication between terminal devices;

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

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

[0314] Figure 4 The figure is a schematic diagram of the hardware structure of the communication device applicable to the embodiment of the present application;

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

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

[0317] Fig. 6A A flowchart of another data transmission method provided in an embodiment of the present application;

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

[0319] Fig. 7A A flowchart of another data transmission method provided in an embodiment of the present application;

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

[0321] Fig. 8A A flowchart of another data transmission method provided in an embodiment of the present application;

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

[0323] Fig. 9 A flowchart of another data transmission method provided in an embodiment of the present application;

[0324] Fig.10 A flowchart of another data transmission method provided in an embodiment of the present application;

[0325] Fig.11 A flowchart of another data transmission method provided in an embodiment of the present application;

[0326] Fig.12 A flowchart of another data transmission method provided in an embodiment of the present application;

[0327] Fig.13A Schematic diagram of transmitting downlink data from an access network device to a second terminal device via a first terminal device and transmitting uplink data from the second terminal device to the access network device via the first terminal device;

[0328] Fig. 13B Schematic diagram of transmitting downlink data from an access network device to a second terminal device via a first terminal device and transmitting uplink data from the second terminal device to the access network device via the first terminal device;

[0329] Fig.14 A schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0330] Fig.15 A simplified schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0331] Fig.16 A simplified schematic diagram of the structure of an access network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0332] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Among them, the terms "system" and "network" in the embodiments of the present application can be used interchangeably. Unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship. For example, A / B can represent A or B; "and / or" in this application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. These three situations, where A and B can be singular or plural. And, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items 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, c can be one or more. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish between network elements and identical or similar items with substantially the same functions. Those skilled in the art can understand that words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit the difference.

[0333] References to "one embodiment" or "some embodiments" etc. described in the embodiments of the present application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0334] The following specific implementation methods further describe in detail the objectives, technical solutions and beneficial effects of the present application. It should be understood that the following are only specific implementation methods of the present application and are not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the scope of protection of the present application.

[0335] In the various embodiments of the present application, unless otherwise specified or provided for in any logical conflict, the terms and / or descriptions between the different embodiments are consistent and may be referenced to each other, and the technical features in the different embodiments may be combined to form new embodiments according to their inherent logical relationships.

[0336] Some of the nouns (or communication terms) involved in this application are explained below. It is understandable that when the following nouns (or communication terms) are involved elsewhere in this application, they will not be explained later.

[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 communicate directly without forwarding through base stations.

[0339] Among them, the interface between terminal devices is called PC5 interface, which is similar to Uu interface between terminal devices and access network devices. It can be understood that the control plane protocol stack involved in the communication between terminal devices can refer to Figure 1 ,like Figure 1 As shown, on the control plane, there can be a 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. between terminal device A and terminal device B.

[0340] In addition, the communication types supported on the SL may include broadcast communication, multicast communication, and unicast communication. In the long term evolution (LTE) system, broadcast communication is supported on the SL. In the new air interface (NR) system, broadcast communication, multicast communication, and unicast communication are supported on the SL.

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

[0342] Multicast communication refers to the communication between all terminals in a communication group. Any terminal device in the group can send and receive data of the multicast service.

[0343] Unicast communication is similar to the data communication performed after a radio resource control (RRC) connection is established between a terminal device and an access network device, and requires a unicast connection to be established between the two terminal devices in advance. After the unicast connection is established, the two terminal devices can communicate data based on the negotiated identifier, and the data can be encrypted or unencrypted. Compared to broadcasting, in unicast communication, the unicast communication can only be performed between two terminal devices that have established a unicast connection. It can be understood that unicast communication corresponds to a pair of source layer 2 identifiers (source Layer-2 identifier, source L2 ID) and destination layer 2 identifiers (Destination Layer-2 Identifier, destination L2 ID). For example, the sub-header of each SL MAC protocol data unit (protocol data unit, PDU) contains a source layer 2 identifier and a destination layer 2 identifier so that the data is transmitted to the correct receiving end.

[0344] 2. Radio bearer (RB)

[0345] RB is a general term for a series of protocol entities and configurations allocated by the access network device to the terminal device. It is a service provided by Layer 2 for transmitting user data between the access network device and the terminal device, including a series of resource configurations such as the PDCP layer entity. RB can be divided into data radio bearer (DRB) and signaling radio bearer (SRB). The former is used to carry data, and the latter is used to carry signaling messages. In the SL communication scenario, RB is called sidelink radio bearer (SL RB). SLRB can be divided into sidelink data radio bearer (SL DRB) and sidelink signaling radio bearer (SL SRB).

[0346] 3. RLC Bearer

[0347] RLC bearer refers to the protocol entity and configuration below the RLC layer, which is the lower layer part of the radio bearer and includes a series of resources such as RLC layer entities and logical channels.

[0348] In the present application, RLC bearers can be divided into RLC bearers used when a terminal device communicates with an access network device, and RLC bearers used when a terminal device communicates with another terminal device. It is understandable that the RLC bearer used when a terminal device communicates with an access network device can be called a Uu RLC bearer, and the RLC bearer used when a terminal device communicates with another terminal device can be called a PC5 RLC bearer. In other words, the Uu RLC bearer is an RLC bearer on a Uu link (Uu link) or a Uu interface, and the PC5RLC bearer is an RLC bearer on an SL or PC5 interface. The Uu link is the link between a terminal device and an access network device. It is understandable that Uu RLC bearer and PC5 RLC bearer are names, and the names are used in this application as description examples without limiting the names.

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

[0350] U2N Relay is a technology that allows a terminal device to communicate with an access network device through another terminal device. U2N Relay can also be called relay technology.

[0351] The protocol architecture of U2N Relay can be found in Figure 2 ,like Figure 2 As shown, there are two types of U2N Relay protocol stacks, one is L3 relay (L3 relay) and the other is L2 relay (L2 relay). This application only introduces L2 relay. The data packets of the remote terminal device (Remote UE) are relayed and forwarded below the RLC layer of the relay terminal device (Relay UE), that is, the relay terminal device only maintains the relayed RLC bearer. Therefore, there are end-to-end PDCP layer, service data adaptation protocol (SDAP) layer and RRC layer between the remote terminal device and the access network device, but there is no end-to-end RLC layer, MAC layer and PHY layer.

[0352] In addition, the protocol architecture of U2N Relay adds an adaptation (adaptation, Adapt) layer between the RLC layer and the PDCP layer. Among them, the adaptation layer can be divided into an adaptation layer used when the terminal device communicates with the access network device, and an adaptation layer used when the terminal device communicates with the terminal device. It can be understood that in the 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 the terminal device 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 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 the multiplexing and demultiplexing of bearers, that is, it supports the multiplexing of data on different wireless bearers onto one RLC bearer or the splitting of data on one RLC bearer into different wireless bearers. For example, taking the downlink direction as an example, the adaptation layer of the access network device can multiplex the data on at least one wireless bearer corresponding to each remote device in at least one remote terminal device onto the same RLC bearer, that is, one RLC bearer on the Uu link can contain the data on at least one wireless bearer corresponding to each remote device in at least one remote terminal device. On the SL of each remote terminal device, the data on at least one wireless bearer of the remote terminal device can be mapped to the same PC5RLC bearer. Similarly in the uplink direction, the adaptation layer of the remote terminal device can map the data on multiple wireless bearers of the remote terminal device to the same PC5 RLC bearer. The adaptation layer of the relay terminal device can multiplex the data on at least one wireless bearer corresponding to each remote device in at least one remote terminal device onto the RLC bearer of the same Uu link.

[0354] 5. Service data unit (SDU), protocol data unit (PDU)

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

[0356] Exemplarily, for a certain protocol layer, if the data received by the protocol layer does not include the protocol layer header of the protocol layer, the data can be considered as the SDU of the protocol layer. If the data received by the protocol layer includes the protocol layer header of the protocol layer, the data can be considered as the PDU of the protocol layer. For example, for the adaptation layer, if the data received by the adaptation layer does not include the adaptation layer header, the data packet can be considered as the SDU of the adaptation layer, and if the data received by the adaptation layer includes the adaptation layer header, the data packet can be considered as the PDU of the adaptation layer.

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

[0358] In addition, the technical solutions of the embodiments of the present application can also be applied to device-to-device (D2D) equipment, vehicle to everything (V2X) equipment, unmanned driving (unmanned driving), automated driving (automated driving, ADS), driver assistance (driver assistance, ADAS), intelligent driving (intelligent driving), connected driving (connected driving), intelligent network driving (intelligent network driving), car sharing and other fields.

[0359] The following describes the basic architecture of the communication system provided by the embodiment of the present application. Figure 3 , Figure 3 The basic architecture of the communication system provided in the embodiment of the present application. Figure 3 As shown, the communication system may include a first terminal device 10, and at least one second terminal device 20 ( Figure 3 Only one is shown) and an access network device 30 that communicates with the first terminal device 10. Figure 3 It is only a schematic diagram and does not constitute a limitation on the applicable scenarios of the technical solution provided in this application.

[0360] Among them, the first terminal device 10 and the second terminal device 20 are entities on the user side for receiving signals, or sending signals, or receiving signals and sending signals. The first terminal device 10 and the second terminal device 20 are used to provide one or more of voice services and data connectivity services to users. 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 device or road side unit (RSU). The first terminal device 10 and the second terminal device 20 may also be a drone, an Internet of Things (IoT) device, a station (ST) in a WLAN, a cellular phone, a smart phone, a cordless phone, a wireless data card, a tablet computer, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a laptop computer, a machine type communication (MTC) terminal, a handheld device with a wireless communication function, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device (also referred to as a wearable smart device), a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a transportation safety (transportation) device, a wearable device (also referred to as a wearable smart device), a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety (transportation) device, a wireless terminal in smart grid ... The first terminal device 10 and the second terminal device 20 may also be device-to-device (D2D) devices, such as electric meters and water meters.The first terminal device 10 and the second terminal device 20 may also be terminals in a 5G system or terminals in a next generation communication system, which is not limited in the embodiments of the present application.

[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, and there is no limitation here.

[0362] In the present application, the first terminal device 10 and the second terminal device 20 may be located within the coverage of the same access network device; or, the first terminal device 10 and the second terminal device 20 may be located within the coverage of different access network devices; or, the first terminal device 10 is located within the coverage of the access network device 30, and the second terminal device 20 is located outside the coverage of the access network device 30, and no limitation is made here. It can be understood that the first terminal device 10 is a relay terminal device, and the second terminal device 20 is a remote terminal device.

[0363] Among them, the access network device 30 is an entity on the network side for sending signals, or receiving signals, or sending and receiving signals. 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, and various forms of control nodes. For example, a network controller, a wireless controller, a wireless controller in a cloud radio access network (CRAN) scenario, etc. Specifically, the access network equipment can be various forms of macro base stations, micro base stations (also called small stations), relay stations, access points (AP), radio network controllers (RNC), node B (NB), base station controllers (BSC), base transceiver stations (BTS), home base stations (for example, home evolved node B, or home node B, HNB), baseband units (BBU), transmission points (TRP), transmitting points (TP), mobile switching centers, etc., and can also be antenna panels of base stations. The control node can connect to multiple base stations and configure resources for multiple terminals covered by multiple base stations. In systems using different wireless access technologies, the names of devices with base station functions may be different. For example, it can be an evolved base station (evolutional node B, eNB or eNodeB) in the LTE system, it can also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, it can also be a gNB in ​​5G, or the access network device 30 can be a relay station, access point, vehicle-mounted device, wearable device, and 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 solution provided in the embodiment of the present application is applicable to a variety of system architectures. The network architecture and business scenarios described in the embodiment of the present application are intended to more clearly illustrate the technical solution of the embodiment of the present application, and do not constitute a limitation on the technical solution provided in the embodiment of the present application. It is known to those skilled in the art that with the evolution of the network architecture and the emergence of new business scenarios, the technical solution provided in the embodiment of the present application is 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 one device, or by multiple devices, or by a functional module in one device, which is not specifically limited in the embodiments of the present application. It is understandable that the above functions can be network elements in hardware devices, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform).

[0366] For example, Figure 3 Each device in the Figure 4 The communication device 400 is used to implement the above. Figure 4 The hardware structure diagram of the communication device 400 applicable to the embodiment of the present application is shown in FIG.

[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 for controlling the execution of the program of the present application.

[0368] The communication link 402 may include a pathway to transmit information between the above-mentioned components.

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

[0370] The memory 403 can be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, or 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 disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of an instruction or data structure and can be accessed by a computer, but is not limited thereto. The memory can be independent and connected to the processor via a communication line 402. The memory can also be integrated with the processor. The memory provided in the embodiment of the present application can generally have non-volatility.

[0371] The memory 403 is used to store computer-executable instructions for executing the solution of the present application, and the execution is controlled by the processor 401. The processor 401 is used to execute the computer-executable instructions stored in the memory 403, thereby implementing the method provided in the following embodiments of the present application.

[0372] Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application code, which is not specifically limited in the embodiments of the present application.

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

[0374] In a possible implementation, the communication device 400 may include multiple processors, for example Figure 4 401 and processor 407 in the embodiment of the present invention. Each of these processors may be a single-CPU processor or a multi-CPU processor. The processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (e.g., computer program instructions).

[0375] In a 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 may display information in a variety of 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. The input device 406 communicates with the processor 401 and may receive user input in a variety of ways. For example, the input device 406 may be a mouse, a keyboard, a touch screen device, or a sensor device.

[0376] The communication device 400 can be a general purpose device or a dedicated device. In a specific implementation, the communication device 400 can be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device or a computer with a plurality of other functions. Figure 4 The embodiment of the present application does not limit the type of the communication device 400.

[0377] Hereinafter, embodiments of the present application are described in conjunction with the accompanying drawings. Optionally, in the present application, the first RLC bearer is used when the first terminal device communicates with the access network device, and 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 a Uu RLC bearer used when the first terminal device communicates with the access network device. In addition, the first RLC bearer is used to transmit data corresponding to at least one terminal device from the access network device, which 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 is used to transmit data from at least one terminal device, which 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. Among them, the second terminal device is a terminal device in at least one terminal device. It should be noted that when the first RLC bearer is involved elsewhere in this application, no further explanation will be given later.

[0378] First combine Figure 5A and Figure 5B , explaining how to correctly deliver downlink data when only one PC5 adaptation layer entity is configured in the first terminal device, and the PC5 adaptation layer entity is an adaptation layer entity shared by the PC5 RLC bearer corresponding to at least one remote terminal device.

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

[0380] 501. 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.

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

[0382] Optionally, the first indication information is used to indicate a radio bearer corresponding to the second terminal device transmitting the first data. Figure 5A and Figure 5B In the embodiment, the first indication information is used to indicate the wireless bearer corresponding to the second terminal device transmitting the first data, which can be understood as: the first indication information is used to indicate the wireless bearer corresponding to the second terminal device receiving the first data.

[0383] Optionally, the first indication information may be implemented in any of the following ways, which are not limited here.

[0384] Mode 1.1, the first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device. It can be understood that the first adaptation layer entity of the first terminal device delivers the identifier of the wireless bearer and 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 first data to the correct RLC bearer.

[0385] Mode 1.2, the first indication information includes the identification information of the wireless bearer and the identification information of the unicast connection on the side link, and the side link is the side link between the first terminal device and the second terminal device. It can be understood that the first adaptation layer entity of the first terminal device delivers the identification information of the wireless bearer and the identification information of the unicast connection on the side link 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 first data to the correct RLC bearer.

[0386] The radio bearers in Mode 1.1 and Mode 1.2 may include DRB and / or SRB, which is not limited here.

[0387] Optionally, in the present application, the identification information of the unicast connection on the side link may include one or more of the following: destination layer 2 identification, source layer 2 identification, which is not limited here. In addition, the identification information of the unicast connection on the side link may be replaced by: identification information of the broadcast connection on the side link, identification information of the multicast connection on the side link, etc., which is not limited here.

[0388] Optionally, for method 1.2, the first indication information also includes an identifier of the second terminal device, that is, when the first adaptation layer entity of the first terminal device delivers the identifier of the wireless bearer and the identifier information of the unicast connection on the sidelink 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 the embodiment, 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. The second adaptation layer entity of the first terminal device is an adaptation layer entity shared by at least one PC5 RLC bearer corresponding to the terminal device. It can be understood that the PC5 RLC bearer corresponding to one terminal device can be at least one PC5RLC bearer.

[0390] It should be noted that Figure 5A and Figure 5B In the embodiment, the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, or the same adaptation layer entity, which is not limited here. It can be understood that if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, this solution is implemented by steps 501-502; if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are the same adaptation layer entity, this solution is implemented by step 502.

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

[0392] Optionally, when the first adaptation layer entity of the first terminal device 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; when the first adaptation layer entity of the first terminal device 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 an identifier of a radio bearer and an identifier of the second terminal device, when 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, it can be implemented in any of the following ways, which are not limited here.

[0393] Mode 2.1: 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, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device does not perform additional processing on the fourth data, so the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

[0394] Mode 2.2: The identifier of the wireless bearer and the identifier of the second terminal device are not included in the header of the first data, that is, the first data is an 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 wireless bearer and the identifier of the second terminal device. It should be understood that the first terminal device can associate the identifier of the wireless bearer and the identifier of the second terminal device with the first data through internal implementation, so that the overhead can be reduced and the efficiency of downlink data delivery is improved.

[0395] Mode 2.3: The first adaptation layer entity of the first terminal device generates the fifth data, and the fifth data includes the first data and the identifier of the wireless bearer; the first adaptation layer entity of the first terminal device submits the fifth data and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, and the identifier of the second terminal device is submitted to the second adaptation layer entity through an additional indication. It should be understood that the first terminal device can associate the identifier of the second terminal device with the first data through internal implementation. Among them, the fifth data is PDU, the first data is SDU, and the identifier of the wireless 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 wireless bearer is included in the header of the fifth data, and the identifier of the second terminal device is not included in the header of the fifth data, the header overhead is saved and the downlink data delivery efficiency is improved.

[0396] Optionally, if the first indication information includes the identification information of the wireless bearer and the identification information of the unicast connection on the side link, when 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, it can be implemented in any of the following ways, which are not limited here.

[0397] Mode 3.1: The identification information of the radio bearer and the unicast connection on the side link are not included in the packet header of the first data, that is, the first data is an SDU. That is, the first adaptation layer entity of the first terminal device removes the packet header of the fourth data, and additionally indicates the identification information of the radio bearer and the unicast connection on the side link. It should be understood that the first terminal device can associate the identification information of the unicast connection on the side link with the first data through internal implementation, so that the overhead can be reduced and the efficiency of downlink data delivery is improved.

[0398] Mode 3.2: The first adaptation layer entity of the first terminal device generates the fifth data, which includes the first data and the identification of the wireless bearer; the first adaptation layer entity of the first terminal device delivers the fifth data and the identification information of the unicast connection on the side link 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 identification information of the wireless bearer is included in the packet header of the fifth data, that is, the first adaptation layer entity of the first terminal device reconstructs the fifth data, because the identification information of the wireless bearer is included in the packet header of the fifth data, and the identification information of the unicast connection on the side link is not included in the packet header of the fifth data, but is sent to the second adaptation layer through additional indication information, thereby saving the header overhead and improving the downlink data delivery efficiency. It should be understood that the first terminal device can associate the identification information of the unicast connection on the side link with the first data through internal implementation.

[0399] Optionally, for method 3.1, if the first indication information also includes the identifier of the second terminal device, then the identifier of the second terminal device may not be included in the packet header of the first data; for method 3.2, if the first indication 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 packet header of the fifth data, which is not limited here.

[0400] Optionally, for mode 3.1 and mode 3.2, because 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 wireless bearer and the identifier of the second terminal device, the first adaptation layer entity of the first terminal device can determine the identification information of the unicast connection on the sidelink according to the identifier of the second terminal device. Specifically, the first adaptation layer entity of the first terminal device determines the identification information of the unicast connection on the sidelink according to 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 identification information of the unicast connection on the sidelink.

[0401] The second corresponding relationship includes the corresponding relationship 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 indication information, and the second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

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

[0404] Among them, the second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device, which 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 the present 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, which is not limited 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 wireless 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.

[0407] The first corresponding relationship includes the corresponding relationship 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 wireless 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 wireless 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 delivers the first data to the second RLC bearer in accordance with method 4.1. If the first indication information includes the identifier of the wireless 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 wireless 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 corresponding to the sidelink, and the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer in accordance with method 4.2 or 4.3. If the first indication information includes the identifier of the wireless bearer, the identifier of the second terminal device 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 wireless bearer, the identifier of the second terminal device and the identifier information of the unicast connection on the sidelink to the second adaptation layer entity of the first terminal device, and there is at least one RLC bearer corresponding to the sidelink, the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer, which can be implemented by method 4.3.

[0409] Method 4.1, Figure 5A and Figure 5B The illustrated embodiment also includes: the second adaptation layer entity of the first terminal device determines the side link according to the identifier of the second terminal device and the second correspondence; the side link is a side link between the first terminal device and the second terminal device, and the side link corresponds to at least one RLC bearer; the second correspondence includes the correspondence between the identification information of the unicast connection on the side link 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 according to the identifier of the wireless 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 among the at least one RLC bearer according to the identifier of the wireless bearer, the identifier of the second terminal device and the first correspondence. It can be understood that when the first adaptation layer entity of the first terminal device delivers the identifier of the wireless 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; further, the first data can be delivered to the second RLC bearer in at least one RLC bearer based on the identifier of the wireless 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] Mode 4.2, 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, including: the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer in at least one RLC bearer according to the identifier of the wireless bearer, the identifier of the second terminal device and the first corresponding relationship. It can be understood that in the case where the first adaptation layer entity of the first terminal device delivers the identifier of the wireless bearer and the identification 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; further, the first data is delivered to the second RLC bearer in at least one RLC bearer according to the identifier of the wireless bearer, the identifier of the second terminal device and the first corresponding relationship, 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.

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

[0412] Mode 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 indication 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 wireless bearer, the identification information of the unicast connection on the side link and the third corresponding relationship. It can be understood that in the case where the first adaptation layer entity of the first terminal device delivers the identifier of the wireless bearer and the identification 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; further, the first data is delivered to the second RLC bearer according to the identifier of the wireless bearer, the identification information of the unicast connection on the side link and the third corresponding relationship, 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.

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

[0414] Optionally, for 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 identifier of the wireless bearer, the identification information of the unicast connection on the sidelink and the third correspondence. It can be understood that: the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer among at least one RLC bearer according to the identifier of the wireless bearer, the identification information of the unicast connection on the sidelink and the third correspondence.

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

[0416] Optional, for method 4.1 or method 4.2, Figure 5A and Figure 5B The illustrated embodiment may also include: a second adaptation layer entity of the first terminal device generates second data; the second data includes first data and second indication information; the second indication information includes an identifier of a wireless bearer, or the second indication information includes an identifier of the wireless bearer and an identifier of the second terminal device; the second adaptation layer entity of the first terminal device delivers the first data to a second RLC bearer in at least one RLC bearer according to the identifier of the wireless 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 a second RLC bearer in at least one RLC bearer according to the identifier of the wireless 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.

[0417] The second data is a PDU, and the second indication information is included in the header of the second data. It can be 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 mode 2.2, mode 2.3, mode 3.1 and mode 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 also include: 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 wireless bearer; 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 wireless bearer, the identification information of the unicast connection on the side link and the third correspondence, including: the second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer according to the identifier of the wireless bearer, the identification information of the unicast connection on the side link and the third 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.

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

[0420] Among them, the second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer according to the identifier of the wireless bearer, the identification information of the unicast connection on the side link and the third correspondence. It can be understood that: the second adaptation layer entity of the first terminal device delivers the third data to the second RLC bearer among at least one RLC bearer according to the identifier of the wireless bearer, the identification information of the unicast connection on the side link and the third correspondence.

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

[0422] Optional, Figure 5A and Figure 5B The illustrated embodiment may also include: the first terminal device receives the first configuration information from the access network device, and correspondingly, the access network device sends 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 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.

[0423] The first configuration information may be included in RRC signaling or other signaling, which is not limited here. It is understandable that the first configuration information may 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 may be sent by the access network device to the first terminal device spontaneously, which is not limited here. The configuration information request message may be used to instruct the access network device to send the first configuration information.

[0424] Among them, any of the methods 2.1 to 2.3 and method 4.1 are used to implement Figure 5A and Figure 5B In the embodiment shown, 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 the first correspondence and the second 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 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. Figure 5A and Figure 5B In the embodiment shown, 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 and / or the PC5 adaptation layer of the first terminal device, that is, the first configuration information includes the first correspondence and the second 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 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 and the PC5 adaptation layer of the first terminal device. Adopt any of the methods 3.1-3.2 and method 4.3 to implement Figure 5A and Figure 5B In the illustrated embodiment, the second corresponding relationship is the configuration information of the Uu adaptation layer of the first terminal device; and the third corresponding relationship 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 may be included in the same information element or in different information elements, which is not limited here.

[0426] 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 included in the same information element, 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 included in the first information element. The first information element can be a predefined information element or a fixed information element, which is not limited here. For example, the first information element can be an Adapt-Config information element, or an information element with similar definition or function, or an information element of an extended field, which is not limited here.

[0427] Optionally, any of the methods 2.1 to 2.3 and method 4.1 can be used to implement Figure 5A and Figure 5B In the embodiment shown, the first cell may include the first sub-cell. 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, an identifier of a second RLC bearer, and the first sub-information element is used to indicate a first corresponding relationship. The first sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the first sub-information element may be a MappingInfo information element in a Bearer-MappingInfoList information element, or an information element with similar definition or function, or an information element with an extended field, which is not limited here. The second sub-information element may include one or more of the following: identification information of a unicast connection on a side link, an identifier of a terminal device, and the second sub-information element is used to indicate a second corresponding relationship. The second sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the second sub-information element may be a dst-mappingInfo information element in a DST-MappingInfoList information element, or an information element with similar definition or function, or an information element with an extended field, which is not limited here.

[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 included in the same information element, the first sub-information element may also include the identifier of the first RLC bearer, and the first sub-information element is also used to indicate the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0429] Exemplarily, when the first cell includes the first sub-cell and the second sub-cell, the first cell may be:

[0430]

[0431]

[0432] Among them, the Bearer-MappingInfoList information element may include a first corresponding relationship, and the access network device can configure a maximum of maxNrofRemoteUEs group corresponding relationships, and maxNrofbearers is the number of bearers corresponding to the terminal devices that the first terminal device can relay at most. The DST-MappingInfoList information element may include a second corresponding relationship, and the access network device can configure a maximum of maxNrofRemoteUEs group corresponding relationships, and maxNrofRemoteUEs is the number of terminal devices that the first terminal device can connect to. It can be understood that DRB-ID is the identifier of the wireless 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 identification information of the unicast connection on the sidelink.

[0433] Optionally, any of the methods 3.1-3.2 and 4.3 can be used to implement 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 a wireless bearer, identifier information of a unicast connection on a side link, an identifier of a second RLC bearer, and the third sub-information element is used to indicate a third corresponding relationship. The third sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the third sub-information element may be a MappingInfo information element in a Bearer-MappingInfoList information element, or an information element of a similar definition or function, or an information element of an extended field, which is not limited here. 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 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, which is not limited here. For example, the second cell may be a Uu-Adapt-Config cell, or a cell with a similar definition or function, or a cell with an extended field, which is not limited here. The third cell may be a predefined cell, or a fixed cell, which is not limited here. For example, the third cell may be a PC5-Adapt-Config cell, or a cell with a similar definition or function, or a cell with an extended field, which is not limited here.

[0434] Optionally, any of the methods 2.1 to 2.3 and method 4.1 can be used to implement Figure 5A and Figure 5B In the illustrated embodiment, the third cell includes a first sub-cell and a second sub-cell.

[0435] Optionally, any of the methods 3.1 to 3.2 and method 4.2 can be used to implement Figure 5A and Figure 5B In the illustrated embodiment, the second cell may include the second sub-cell, and the third cell may include the first sub-cell. Optionally, the third cell may also include the second sub-cell.

[0436] Optionally, any of the methods 3.1-3.2 and 4.3 can be used to implement Figure 5A and Figure 5B In the illustrated embodiment, the second cell may include a second sub-cell, and the third cell may include a third sub-cell.

[0437] Exemplarily, the second information element may be:

[0438]

[0439] Exemplarily, when the third cell includes the first sub-cell and the second sub-cell, the third cell may be:

[0440]

[0441]

[0442] It can be seen that in the above technical solution, the first terminal device receives the first configuration information from the access network device, so that the first terminal device can 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 Fig. 6A and Figure 6B , explaining how to correctly deliver uplink data when the PC5 adaptation layer entity of the first terminal device is configured with only one PC5 adaptation layer entity, and the adaptation layer entity is shared by the PC5 RLC bearer corresponding to at least one remote terminal device.

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

[0445] 601. 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.

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

[0447] Optionally, the first indication information is used to indicate a radio bearer corresponding to the second terminal device transmitting the first data. Fig. 6A and Figure 6B In the embodiment, the first indication information is used to indicate the wireless bearer corresponding to the second terminal device transmitting the first data, which 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 indication information may be implemented in any of the following ways, which are not limited here.

[0449] Mode 1.1, the first indication information includes the identifier of the wireless bearer and the identifier of the second terminal device. It can be understood that the first adaptation layer entity of the first terminal device delivers the identifier of the wireless bearer and 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 first data to the correct RLC bearer.

[0450] Mode 1.2, the first indication information includes the identification information of the wireless bearer and the identification information of the unicast connection on the side link, and the side link is the side link between the first terminal device and the second terminal device. It can be understood that the first adaptation layer entity of the first terminal device delivers the identification information of the wireless bearer and the identification information of the unicast connection on the side link 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 first data to the correct RLC bearer.

[0451] The radio bearers in Mode 1.1 and Mode 1.2 may include DRB and / or SRB, which is not limited here.

[0452] For the identification information of the unicast connection on the side link in method 1.2, please refer to Figure 5A and Figure 5B The relevant description will not be repeated here.

[0453] Optional, in Fig. 6A and Figure 6BIn the embodiment, 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 an adaptation layer entity shared by at least one PC5 RLC bearer corresponding to the terminal device. It can be understood that the PC5 RLC bearer corresponding to one terminal device can be at least one PC5RLC bearer.

[0454] It should be noted that Fig. 6A and Figure 6B In the embodiment, the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, or the same adaptation layer entity, which is not limited here. It can be understood that if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, this solution is implemented by steps 601-602; if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are the same adaptation layer entity, this solution is implemented by step 602.

[0455] Optional, Fig. 6A and Figure 6B The illustrated embodiment may also include: the first adaptation layer entity of the first terminal device receives the third data from the second RLC bearer; the third data includes the identifier of the radio bearer and the first data, that is, the identifier of the radio bearer is included in the packet 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, that is, the identifier of the radio bearer and the identifier of the second terminal device are included in the packet 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 the 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, that is, 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. It can be understood that, in the case where the first adaptation layer entity of the first terminal device 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 third data from the second RLC bearer before step 601; in the case where the first adaptation layer entity of the first terminal device 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 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, when 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, it can be implemented in any of the following ways, which are not limited here.

[0457] Mode 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, and the fourth data 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 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, the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the fourth data, that is, the first adaptation layer entity of the first terminal device reconstructs the third data.

[0458] Mode 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 packet header of the first data, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device removes the packet header of the third data, and additionally indicates the identifier of the radio bearer and the identifier of the second terminal device, so that the overhead can be reduced and the uplink data delivery efficiency is improved.

[0459] Mode 2.3: When the third data includes the identifier of the wireless 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. 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, so the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

[0460] Mode 2.4: When the third data includes the identifier of the wireless 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. 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, so the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

[0461] Optionally, if the first indication information includes the identification information of the wireless bearer and the identification information of the unicast connection on the side link, when 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, it can be implemented in any of the following ways, which are not limited here.

[0462] Method 3.1: When the third data includes the identifier of the wireless bearer and the first data, the identifier of the wireless bearer and the identifier information of the unicast connection on the side link are not included in the packet header of the first data. The first data is an SDU, that is, the first adaptation layer entity of the first terminal device removes the packet header of the third data, and additionally indicates the identifier of the wireless bearer and the identifier information of the unicast connection on the side link, thereby reducing overhead and improving the efficiency of uplink data delivery.

[0463] Mode 3.2: When the third data includes the identifier of the wireless bearer and the first data, the first adaptation layer entity of the first terminal device delivers the third data and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device. Among them, 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 wireless bearer and the identifier information of the unicast connection on the side link, so the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

[0464] Optionally, for methods 2.1 to 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, thereby realizing the conversion of the identifier information of the unicast connection on the sidelink and the identifier of the second terminal device. The sidelink is a sidelink that transmits the first data. Among them, the sidelink is a sidelink that transmits the first data. The first correspondence 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 indication information.

[0466] Correspondingly, 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 wireless 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 the data, thereby improving the reliability of uplink data transmission.

[0468] The second corresponding relationship includes the corresponding relationship 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 identification information of the radio bearer and the identification information of the unicast connection on the side link, that is, when the first adaptation layer entity of the first terminal device delivers the identification information of the radio bearer and the identification information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, Fig. 6A and Figure 6B The illustrated embodiment also includes: the second adaptation layer entity of the first terminal device determines the identification of the second terminal device based on the identification information of the unicast connection on the side link and the first correspondence, thereby realizing the conversion between the identification information of the unicast connection on the side link and the identification of the second terminal device. It can be understood that the second adaptation layer entity of the first terminal device can be executed based on the identification information of the unicast connection on the side link and the first correspondence before the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer based on the identification information of the unicast connection on the side link and the first correspondence.

[0470] Optional, Fig. 6A and Figure 6B The illustrated embodiment may also include: the second adaptation layer entity of the first terminal device generates the second data; the second data includes the first data and the second indication information; the second indication information includes the identifier of the wireless 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 according to the identifier of the wireless bearer, the identifier of the second terminal device and the second corresponding relationship, including: 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 wireless bearer, the identifier of the second terminal device and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby improving the reliability of uplink data transmission. Wherein, the second data is a PDU, and the second indication information is included in the packet header of the second data.

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

[0472] Optional, Fig. 6A and Figure 6BThe illustrated embodiment may also include: the first terminal device receives the first configuration information from the access network device, and correspondingly, the access network device sends the first configuration information to the first terminal device. The first configuration information includes one or more of the following: a first corresponding relationship, a second corresponding relationship; the first configuration information is used to indicate one or more of the following: the first corresponding relationship 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 second corresponding relationship is the configuration information of the second adaptation layer of the first terminal device.

[0473] The first configuration information may be included in RRC signaling or other signaling, which is not limited here. It is understandable that the first configuration information may 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 may be sent by the access network device to the first terminal device spontaneously, which is not limited here. The configuration information request message may be used to instruct the access network device to send the first configuration information.

[0474] Among them, when using method 2.1 and method 2.3 to achieve Fig. 6A and Figure 6B In the embodiment shown, 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 the first correspondence and the second 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 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; any method in method 2.4 is adopted to implement Fig. 6A and Figure 6B In the embodiment shown, 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 second correspondence, and the first configuration information is used to indicate that the second correspondence is the configuration information of the Uu adaptation layer of the first terminal device; any of the methods 3.1-3.2 is adopted to implement Fig. 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, and 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 may be included in the same information element or in different information elements, which is not limited here.

[0476] Optionally, when 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 are included in the same information element, 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 included in the first information element. The first information element can be a predefined information element or a fixed information element, which is not limited here. For example, the first information element can be an Adapt-Config information element, or an information element with similar definition or function, or an information element of an extended field, which is not limited here.

[0477] Optional, implemented in method 2.1 and method 2.3 Fig. 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 a side link, an identification of a terminal device, and the first sub-information element is used to indicate a first corresponding relationship. The first sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the first sub-information element may be a dst-mappingInfo information element in a DST-MappingInfoList, or an information element with similar definition or function, or an information element of an extended field, which is not limited here. The second sub-information element may include one or more of the following: an identification of a wireless bearer, an identification of a second terminal device, an identification of a first RLC bearer, and the second sub-information element is used to indicate a second corresponding relationship. The second sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the second sub-information element may be a MappingInfo information element in a Bearer-MappingInfoList, or an information element with similar definition or function, or an information element of an extended field, which is not limited here.

[0478] Optional, implemented in any way in method 2.4 Fig. 6A and Figure 6B In the illustrated embodiment, the first cell may include the second sub-cell.

[0479] Optionally, any of the methods 3.1 to 3.2 can be used to implement Fig. 6A and Figure 6B In the illustrated embodiment, a first cell may include a first sub-cell and a second sub-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 an identifier of the second RLC bearer, and the second sub-information element is also used to indicate the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device and the identifier of the second RLC bearer.

[0481] Optionally, when 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 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, which is not limited here. For example, the second information element may be a Uu-Adapt-Config information element, or an information element of similar definition or function, or an information element of an extended field, which is not limited here. The third information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the third information element may be a PC5-Adapt-Config information element, or an information element of similar definition or function, or an information element of an extended field, which is not limited here.

[0482] Optional, implemented in method 2.1 and method 2.3 Fig. 6A and Figure 6B In the illustrated embodiment, the second cell may include the second sub-cell, and the third cell may include the first sub-cell.

[0483] Optional, implemented in any way in method 2.4 Fig. 6A and Figure 6B In the illustrated embodiment, the second cell may include the first sub-cell.

[0484] Optionally, any of the methods 3.1 to 3.2 can be used to implement Fig. 6A and Figure 6B In the illustrated embodiment, the second cell may include a first sub-cell and a second sub-cell.

[0485] It should be noted that in this application, the downlink data transmission scheme adopts Figure 5A and Figure 5B The embodiment shown and the scheme for uplink data transmission adopt Fig. 6A and Figure 6B In the embodiment shown, 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 embodiment shown and Fig. 6A and Figure 6BThe first configuration information involved in the illustrated embodiment, that is, the access network device can simultaneously send the configuration information involved in downlink data transmission and the configuration information involved in uplink data transmission to the first terminal device. It can be understood that in this case, 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 included in the same information element or in different information elements, and there is no limitation here. Among them, in the case where 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 included in the same information element, Figure 5A and Figure 5B The illustrated embodiment involves configuration information of the Uu adaptation layer of the first terminal device and configuration information of the PC5 adaptation layer of the first terminal device, and, Fig. 6A and Figure 6B 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 involved in the illustrated embodiment are both included in the same information element. In the case where 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 included in different information elements, Figure 5A and Figure 5B The configuration information of the Uu adaptation layer of the first terminal device involved in the illustrated embodiment, and Fig. 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 embodiment shown involves configuration information of the PC5 adaptation layer of the first terminal device, and, Fig. 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] It can be seen that in the above technical solution, the first terminal device receives the first configuration information from the access network device, so that the first terminal device can 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 Fig. 7A and Figure 7B , explaining how to correctly deliver downlink data when a first terminal device is configured with multiple PC5 adaptation layer entities, and one of the multiple PC5 adaptation layer entities is an adaptation layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

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

[0489] 701. 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.

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

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

[0492] Optionally, the second indication information is used to indicate a radio bearer, and the second indication information includes an identifier of the radio bearer. The radio bearer may include a DRB and / or an SRB, which is not limited here.

[0493] Optional, in Fig. 7A and Figure 7B In the embodiment, 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. The second adaptation layer entity of the first terminal device is an adaptation layer entity used by a PC5RLC bearer corresponding to a terminal device. It can be understood that a PC5RLC bearer corresponding to a terminal device can be at least one PC5 RLC bearer.

[0494] It should be noted that Fig. 7A and Figure 7B In the embodiment, the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, or the same adaptation layer entity, which is not limited here. It can be understood that if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, this solution is implemented by steps 701-702; if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are the same adaptation layer entity, this solution is implemented by step 702.

[0495] Optionally, step 701 may include: the first adaptation layer entity of the first terminal device determines 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 corresponding relationship; 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, so that the first adaptation layer entity of the first terminal device can correctly deliver the downlink data.

[0496] The multiple adaptation layer entities may be adaptation layer entities used by the PC5 RLC bearer corresponding to each terminal device in the multiple terminal devices, that is, one PC5 adaptation layer entity used by the PC5 RLC bearer corresponding to each terminal device.

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

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

[0499] The correspondence between the identification of the second terminal device and the identification information of the unicast connection on the side link, the side link is a 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 of the unicast connection on the side link can be referred to Figure 5A and Figure 5B The relevant description will not be repeated here.

[0501] Optional, Fig. 7A and Figure 7B The illustrated embodiment may also include: the first adaptation layer entity of the first terminal device receives third data from the first RLC bearer, the third data including the first data, an identifier of the wireless bearer and an identifier of the second terminal device, the identifier of the wireless bearer and the identifier of the second terminal device being included in the packet 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, and the RLC layer entity is included in the first RLC bearer. Wherein, in the case where the first adaptation layer entity of the first terminal device 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 third data from the first RLC bearer before step 701; in the case where the first adaptation layer entity of the first terminal device 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 third data from the first RLC bearer before step 702.

[0502] Optionally, 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 in any of the following ways, which are not limited here.

[0503] Mode 1.1: The first adaptation layer entity of the first terminal device generates fourth data, and the fourth data includes the first data and the identifier of the wireless 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 wireless bearer is included in the header of the fourth data, that is, 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, thereby saving the header overhead and improving the downlink data delivery efficiency.

[0504] Mode 1.2: 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. 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 perform additional processing on the third data, so the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

[0505] Method 1.3: The wireless bearer identifier is not included in the packet header of the first data. The first data is SDU, that is, the first adaptation layer entity of the first terminal device removes the packet header of the third data and additionally indicates the wireless bearer identifier, thereby reducing overhead and improving 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 indication information, and the second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device.

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

[0508] Among them, the second RLC bearer is the RLC bearer used when the first terminal device communicates with the second terminal device, which 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 delivers the first data to the second RLC bearer according to the identifier of the wireless bearer and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the downlink data, thereby improving the reliability of downlink data transmission. It can be 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 wireless 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 wireless bearer and the second corresponding relationship.

[0510] The second corresponding relationship includes the corresponding relationship 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 an identifier of the second terminal device. The second indication information is also used to indicate the second terminal device that receives the first data. 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 wireless bearer, the identifier of the second terminal device and the second correspondence. It 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 wireless 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 the downlink data, thereby improving the reliability of downlink data transmission. It can be understood that for method 1.2, after the second adaptation layer entity of the first terminal device receives the identifier of the wireless 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 according to the identifier of the wireless bearer, the identifier of the second terminal device and the second correspondence.

[0512] Optional, Fig. 7A and Figure 7B The illustrated embodiment may also include: the second adaptation layer entity of the first terminal device generates the second data; the second data includes the first data and the third indication information; the third indication information includes the identifier of the wireless bearer, or the third indication information includes the identifier of the wireless 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 according to the identifier of the wireless bearer, the identifier of the second terminal device and the second corresponding relationship, including: the second adaptation layer entity of the first terminal device delivers the second data to the second RLC bearer according to the identifier of the wireless bearer, the identifier of the second terminal device and the second corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the downlink data, thereby improving the reliability of downlink data transmission. Wherein, the second data is a PDU, and the third indication information is included in the packet header of the second data.

[0513] Among them, for mode 1.1 and mode 1.3, the identifier of the radio bearer is included in the header of the second data; for mode 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.

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

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

[0516] The first configuration information may be included in RRC signaling or other signaling, which is not limited here. It is understandable that the first configuration information may 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 may be sent by the access network device to the first terminal device spontaneously, which is not limited here. The configuration information request message may 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 included in the same cell or different 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 included in the same cell or different cells, and there is no limitation here.

[0518] 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 included in the same information element, 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 included in the first information element. The first information element can be a predefined information element or a fixed information element, which is not limited here. For example, the first information element can be an Adapt-Config information element, or an information element with similar definition or function, or an information element of an extended field, which is not limited 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 the unicast connection on the side link, an identification of the second terminal device, an identification of the second adaptation layer entity of the first terminal device, and the first sub-information element is used to indicate the first corresponding relationship. The first sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the first sub-information element may be a dst-mappingInfo information element in a DST-MappingInfoList information element, or an information element with similar definition or function, or an information element of an extended field, which is not limited here. The second sub-information element may include one or more of the following: an identification of a wireless bearer, an identification of a second terminal device, an identification of a second RLC bearer, and the second sub-information element is used to indicate a second corresponding relationship. The second sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the second sub-information element may be a MappingInfo information element in a Bearer-MappingInfoList information element, or an information element with similar definition or function, or an information element of an extended field, which is not limited here.

[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 included in the same information element, the second sub-information element may also include the identifier of the first RLC bearer, and the second sub-information element is also used to indicate the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device and the identifier of the first RLC bearer.

[0521] Wherein, when the first sub-information element includes one or more of the following: identification information of the unicast connection on the side link, identification of the terminal device, etc., a specific example of the first information element can be referred to. Figure 5A and Figure 5B In the case where the first sub-information element includes one or more of the following: the identifier of the second adaptation layer entity of the first terminal device and the identifier of the terminal device, the first information element may be:

[0522]

[0523] Among them, the Bearer-MappingInfoList information element may include a second correspondence relationship, and the access network device can configure a maximum of maxNrofRemoteUEs group correspondence relationships, and maxNrofbearers is the number of bearers corresponding to the terminal devices that the first terminal device can relay at most. The DST-MappingInfoList information element may include a first correspondence relationship, and the access network device can configure a maximum of maxNrofRemoteUEs group correspondence relationships, and maxNrofRemoteUEs is the number of terminal devices that the first terminal device can connect to. It can be understood that DRB-ID is the identifier of the wireless 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, 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 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, which is not limited here. For example, the second information element may be a Uu-Adapt-Config information element, or an information element of similar definition or function, or an information element of an extended field, which is not limited here. The third information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the third information element may be a PC5-Adapt-Config information element, or an information element of similar definition or function, or an information element of an extended field, which is not limited here.

[0525] Optionally, the second information element may include the first sub-information element. It can be understood that for downlink data transmission, the access network device may configure the first corresponding relationship in the second information element.

[0526] Optionally, the third information element may include the second sub-information element. It can be understood that for downlink data transmission, the access network device may configure the second corresponding relationship in the third information element.

[0527] Exemplarily, when the first sub-information element includes one or more of the following: identification information of the unicast connection on the sidelink, and an identification of the terminal device, the second information element may be:

[0528]

[0529]

[0530] As another example, when the first sub-information element includes one or more of the following: an identifier of the second adaptation layer entity of the first terminal device and an identifier of the terminal device, the second information element may be:

[0531]

[0532] Exemplarily, the third information element may be:

[0533]

[0534] It can be seen that in the above technical solution, the first terminal device receives the first configuration information from the access network device, so that the first terminal device can 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 Fig. 8A and Figure 8B , explaining how to correctly deliver uplink data when a first terminal device is configured with multiple PC5 adaptation layer entities, and one of the multiple PC5 adaptation layer entities is an adaptation layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

[0536] 801. 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.

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

[0538] Optionally, the first indication information is used to indicate a wireless bearer, and the wireless bearer may include a DRB and / or an SRB, which is not limited here.

[0539] Optional, in Fig. 8A and Figure 8B In the embodiment, 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 an adaptation layer entity used by a PC5RLC bearer corresponding to a terminal device. It can be understood that a PC5RLC bearer corresponding to a terminal device can be at least one PC5 RLC bearer.

[0540] It should be noted that Fig. 8A and Figure 8BIn the embodiment, the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, or the same adaptation layer entity, which is not limited here. It can be understood that if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are two independent adaptation layer entities, this solution is implemented by steps 801-802; if the first adaptation layer entity of the first terminal device and the second adaptation layer entity of the first terminal device are the same adaptation layer entity, this solution is implemented by step 802.

[0541] Optional, Fig. 8A and Figure 8B The illustrated embodiment may also include: the first adaptation layer entity of the first terminal device receives third data from the second RLC bearer, the third data includes an identifier of the radio bearer, that is, the identifier of the radio bearer is included in the packet header of the third data, or the third data includes an identifier of the radio bearer and an identifier of the second terminal device, that is, the identifier of the radio bearer and the identifier of the second terminal device are included in the packet header of the third data. For example, the first adaptation layer entity of the first terminal device receives the third data from the RLC layer entity included in the second RLC bearer. The second RLC bearer is an RLC bearer used when the first terminal device communicates with the second terminal device, that is, the second RLC bearer is a PC5 RLC bearer of the first terminal device used when the first terminal device communicates with the second terminal device. It can be understood that, in the case where the first adaptation layer entity of the first terminal device 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 third data from the second RLC bearer before step 801; in the case where the first adaptation layer entity of the first terminal device 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 third data from the second RLC bearer before step 802.

[0542] Optionally, 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 in any of the following ways, which are not limited here.

[0543] Mode 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 the fourth data, and the fourth data 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 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, the identifier of the radio bearer and the identifier of the second terminal device are included in the header of the fourth data, that is, the first adaptation layer entity of the first terminal device reconstructs the third data.

[0544] Mode 1.2: When the third data includes the identifier of the wireless 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. 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, so the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

[0545] Mode 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 packet header of the first data, and the first data is an SDU. That is, the first adaptation layer entity of the first terminal device removes the packet header of the third data, and additionally indicates the identifier of the radio bearer and the identifier of the second terminal device, so that the overhead can be reduced and the uplink data delivery efficiency is improved.

[0546] Mode 1.4: When the third data includes the identifier of the wireless 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. 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, so the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

[0547] Optionally, for method 1.2 and method 1.3, the first adaptation layer entity of the first terminal device may also submit the identifier of the second terminal device to the second adaptation layer entity of the first terminal device. Therefore, the first adaptation layer entity of the first terminal device may determine the identifier of the second terminal device based on the second indication information and the second correspondence, thereby realizing the conversion of the second indication information and the identifier of the second terminal device.

[0548] Optionally, the second indication information includes one or more of the following: an identifier of the first adaptation layer entity, identification information of a unicast connection on a side link, where the side link is a side link between a first terminal device and a second terminal device.

[0549] Optionally, the second corresponding relationship includes one or more of the following:

[0550] A correspondence between an identifier of a first adaptation layer entity of a first terminal device and an identifier of a 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] For the identification information of the unicast connection on the side link, please refer to Figure 5A and Figure 5BThe relevant description in 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 indication information.

[0554] Correspondingly, 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 wireless 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 uplink data transmission.

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

[0557] Optionally, with respect to methods 1.2 to 1.3, when 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, Fig. 8A and Figure 8B The illustrated embodiment also includes: the second adaptation layer entity of the first terminal device determines the identifier of the second terminal device according to the third indication information and the third correspondence, thereby realizing the conversion of the third indication information and the identifier of the second terminal device. It can be understood that the second adaptation layer entity of the first terminal device determines the identifier of the second terminal device according to the third indication information and the third correspondence before 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 wireless bearer, the identifier of the second terminal device and the first correspondence.

[0558] Among them, the third indication information includes one or more of the following: the identification of the second adaptation layer entity, the identification information of the unicast connection on the side link, 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.

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

[0560] A correspondence between an identifier of a second adaptation layer entity of a first terminal device and an identifier of a 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, Fig. 8A and Figure 8BThe illustrated embodiment also includes: the second adaptation layer entity of the first terminal device generates the second data; the second data includes the first data, the identifier of the wireless bearer and the identifier of the second terminal device, or the second data includes the first data and the identifier of the wireless 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, including: 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 wireless bearer, the identifier of the second terminal device and the first corresponding relationship, so that the second adaptation layer entity of the first terminal device can correctly deliver the data, thereby improving the reliability of uplink data transmission. Wherein, the second data is a PDU, and for mode 1.4, the identifier of the wireless bearer and the identifier of the second terminal device are included in the packet header of the second data; for modes 1.1-1.3, the identifier of the wireless bearer is included in the packet header of the second data.

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

[0564] Optional, Fig. 8A and Figure 8B The illustrated embodiment may also include: the first terminal device receives the second configuration information from the access network device, and correspondingly, the access network device sends the second configuration information to the first terminal device. The second configuration information includes one or more of the following: a first corresponding relationship, a second corresponding relationship, and a third corresponding relationship. The second configuration information is used to indicate one or more of the following: the first corresponding relationship is the configuration information of the second adaptation layer of the first terminal device; the second corresponding relationship is the configuration information of the first adaptation layer of the first terminal device; the third corresponding relationship is the configuration information of the second adaptation layer of the first terminal device.

[0565] The second configuration information may be included in RRC signaling or other signaling, which is not limited here. It is understandable that the second configuration information may 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 may be sent by the access network device to the first terminal device spontaneously, which is not limited here. The configuration information request message may be used to instruct the access network device to send the second configuration information.

[0566] Optionally, in the case where 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 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 adaptation layer of the first terminal device; the second correspondence is the configuration information of the first adaptation layer of the first terminal device. In the case where 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 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 adaptation layer of the first terminal device; the third correspondence is the configuration information of the second adaptation 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 included in the same cell or different 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 included in the same cell or different cells, and there is no limitation here.

[0568] 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 included in the same information element, 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 included in the first information element. The first information element can be a predefined information element or a fixed information element, which is not limited here. For example, the first information element can be an Adapt-Config information element, or an information element with similar definition or function, or an information element of an extended field, which is not limited 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 wireless bearer, an identifier of the second terminal device, an identifier of the first RLC bearer, and the first sub-information element is used to indicate a first corresponding relationship. The first sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the first sub-information element may be a MappingInfo information element in a Bearer-MappingInfoList information element, or an information element of a similar definition or function, or an information element of an extended field, which is not limited here. 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 identifier information of a unicast connection on a side link, and the second sub-information element is used to indicate a second corresponding relationship. The second sub-information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the second sub-element may be a dst-mappingInfo element in a DST-MappingInfoList element, or an element with similar definition or function, or an element with an extended field, which is not limited here.

[0570] Optionally, when the first adaptation layer entity of the first terminal device does not submit 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 third sub-information element. The third sub-information element 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 side link. The third sub-information element is used to indicate a third corresponding relationship. The third sub-information element may be a predefined information element, or a fixed information element, which is not limited here. The second sub-information element may be the same information element or a different information element as the third sub-information element, which is not limited 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 element, the first sub-information element may also include an identifier of the second RLC bearer, and the first sub-information element is also used to indicate the correspondence between the identifier of the wireless bearer, the identifier of the second terminal device and the identifier of the second RLC bearer.

[0572] 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 included in different information elements, the configuration information of the Uu adaptation layer of the first terminal device may be included in the second information element, and the configuration information of the PC5 adaptation layer of the first terminal device may be included in the third information element. The second information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the second information element may be a Uu-Adapt-Config information element, or an information element of similar definition or function, or an information element of an extended field, which is not limited here. The third information element may be a predefined information element, or a fixed information element, which is not limited here. For example, the third information element may be a PC5-Adapt-Config information element, or an information element of similar definition or function, or an information element of an extended field, which is not limited here.

[0573] 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 second information element may include the second sub-information element, and the third information element may include the first sub-information element.

[0574] Optionally, when 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 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 Fig. 7A and Figure 7B The embodiment shown and the scheme for uplink data transmission adopt Fig. 8A and Figure 8B In the embodiment shown, the configuration information received by the first terminal device from the access network device includes Fig. 7A and Figure 7B The first configuration information involved in the embodiment shown and Fig. 8A and Figure 8B The first configuration information involved in the illustrated embodiment, that is, the access network device can simultaneously send the configuration information involved in downlink data transmission and the configuration information involved in uplink data transmission to the first terminal device. It can be understood that in this case, 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 included in the same information element or in different information elements, and there is no limitation here. Among them, in the case where 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 included in the same information element, Fig. 7A and Figure 7B The illustrated embodiment involves configuration information of the Uu adaptation layer of the first terminal device and configuration information of the PC5 adaptation layer of the first terminal device, and, Fig. 8A and Figure 8BThe 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 involved in the illustrated embodiment are both included in the same information element. In the case where 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 included in different information elements, Fig. 7A and Figure 7B The configuration information of the Uu adaptation layer of the first terminal device involved in the illustrated embodiment, and Fig. 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; Fig. 7A and Figure 7B The embodiment shown involves configuration information of the PC5 adaptation layer of the first terminal device, and, Fig. 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] It can be seen that in the above technical solution, the first terminal device receives the second configuration information from the access network device, so that the first terminal device can 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 Fig. 9 , explaining how to correctly deliver downlink data from the second terminal device side.

[0578] See also Fig. 9 , Fig. 9 A flowchart of another data transmission method provided in an embodiment of the present application is shown below. Fig. 9 As shown, the method includes but is not limited to the following steps:

[0579] 901. An adaptation layer entity of a second terminal device receives second data from an RLC bearer of the second terminal device, where the second data includes second indication information.

[0580] Correspondingly, the RLC bearer of the second terminal device delivers 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 receive data from at least one PDCP layer entity, which is not limited here. It can be understood that the RLC bearer of the second terminal device in step 901 may be one of the at least one RLC bearers. The RLC bearer of the second terminal device is a PC5 RLC bearer of the second terminal device.

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

[0583] Optionally, step 901 may be replaced by: the adaptation layer entity of the second terminal device receives the second data from the RLC layer entity of the second terminal device, and correspondingly, the RLC layer entity of the second terminal device delivers 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 indication information.

[0585] Correspondingly, 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 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 corresponding relationship, 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, in the case where the second indication information includes the identifier of the radio bearer, or in the case where 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 corresponding relationship.

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

[0588] It can be seen that 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 indication information, thereby improving the reliability of downlink data transmission.

[0589] Optional, Fig. 9The illustrated embodiment may also include: the second terminal device receives the first configuration information from the access network device, and correspondingly, the access network device sends the first configuration information to the second terminal device. The first configuration information includes one of the following: a first correspondence, a second correspondence; the first configuration information is used to indicate that the first correspondence and / or the second correspondence is the configuration information of the adaptation layer of the second terminal device. It can be understood that, in the case where the second indication information is the identifier of the wireless bearer, the first configuration information includes the first correspondence, and the first configuration information is used to indicate that the first correspondence is the configuration information of the adaptation layer of the second terminal device; in the case where the second indication information is the identifier of the wireless bearer and the 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 the configuration information of the adaptation layer of the second terminal device.

[0590] The first configuration information may be included in RRC signaling or other signaling, which is not limited here. It is understandable that the first configuration information may be sent by the access network device to the second terminal device when the access network device receives a configuration information request message from the second terminal device or the third terminal device, or the first configuration information may be sent by the access network device to the first terminal device spontaneously, which is not limited here. The configuration information request message may be used to instruct the access network device to send the first configuration information.

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

[0592] It can be seen that in the above technical solution, the second terminal device receives the first configuration information from the access network device, so that the first terminal device can 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 Fig.10 , explaining how to correctly submit uplink data from the second terminal device side.

[0594] See also Fig.10 , Fig.10 A flowchart of another data transmission method provided in an embodiment of the present application is shown below. Fig.10 As shown, the method includes but is not limited to the following steps:

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

[0596] Optionally, the second indication information is used to indicate a wireless bearer, or the second indication information is used to indicate a wireless bearer corresponding to a second terminal device receiving the second data. It can be understood that when the second indication information is used to indicate a wireless bearer, the second indication information is an identifier of the wireless bearer. When the second indication information is used to indicate a wireless bearer corresponding to a second terminal device receiving the second data, the second indication information includes an identifier of the wireless bearer and an 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] Exemplarily, in one possible implementation, before the second terminal device establishes an RRC connection, the first terminal device requests the access network device to allocate an identifier of the second terminal device through an RRC message, such as a (SidelinkUEInformationNR, SUI) message. After the access network allocates, the identifier of the allocated second terminal device is sent to the first terminal device through an RRC message, and the first terminal device then informs the second terminal device of the identifier of the second terminal device through SL. The identifier of the second terminal device can be sent to the second terminal device through a sidelink RRC message, PC5 signaling, or MAC CE message. In another possible implementation, the access network device can receive an RRC setup request (RRCsetupRequest) message sent by the second terminal device, that is, after the second terminal device initiates the establishment of an RRC connection, the identifier of the second terminal device is carried in the reply RRC setup (RRCSetup) 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 indication 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 receive data from at least one PDCP layer entity, which is not limited here. It can be understood that the RLC bearer of the second terminal device in step 1002 may be one of the at least one RLC bearers. The RLC bearer of the second terminal device is a PC5 RLC bearer of the second terminal device.

[0601] Optionally, if the second indication information is the identifier of the wireless 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 wireless 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 corresponding relationship includes the corresponding relationship between the identifier of the wireless 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 wireless 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 wireless 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, thereby improving the reliability of uplink data transmission.

[0604] It can be seen that in the above technical solution, the adaptation layer entity of the second terminal device generates second data, and the second data includes first data and second indication information, so that the adaptation layer entity of the second terminal device can 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, Fig.10 The illustrated embodiment may also include: the second terminal device receives the first configuration information from the access network device, and correspondingly, the access network device sends the first configuration information to the second terminal device. The first configuration information includes one of the following: a first correspondence, a second correspondence, and 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. It can be understood that, in the case where the second indication information is the identifier of the wireless bearer, the first configuration information includes the first correspondence, and the first configuration information is used to indicate that the first correspondence is the configuration information of the adaptation layer of the second terminal device; in the case where the second indication information is the identifier of the wireless bearer and the 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 the configuration information of the adaptation layer of the second terminal device.

[0606] The first configuration information may be included in RRC signaling or other signaling, which is not limited here. It is understandable that the first configuration information may be sent by the access network device to the second terminal device when the access network device receives a configuration information request message from the second terminal device or the third terminal device, or the first configuration information may be sent by the access network device to the first terminal device spontaneously, which is not limited here. The configuration information request message may be used to instruct the access network device to send the first configuration information.

[0607] Optionally, the second terminal device receives the first configuration information from the access network device, which may include: the second terminal device receives the first configuration information from the first terminal device, and the first terminal device receives 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: Fig. 9 The first configuration information involved in the embodiment shown and Fig.10 The first configuration information involved in the illustrated embodiment, that is, the access network device can simultaneously send the configuration information involved in downlink data transmission and the configuration information involved in uplink data transmission to the second terminal device.

[0609] It can be seen that in the above technical solution, the second terminal device receives the first configuration information from the access network device, so that the first terminal device can 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 Fig.11 , explaining how to correctly deliver downlink data from the access network equipment side.

[0611] See also Fig.11 , Fig.11 A flowchart of another data transmission method provided in an embodiment of the present application is shown below. Fig.11 As shown, the method includes but is not limited to the following steps:

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

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

[0614] Among them, 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 indication information.

[0616] Correspondingly, 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 communicates with the first terminal device, that is, the RLC bearer of the access network device is the Uu RLC bearer used when the access network device communicates with the first terminal device.

[0618] Optionally, the adaptation layer entity of the access network device may receive data from at least one RLC bearer and / or receive data from at least one PDCP layer entity, which is not limited here. It can be understood that the RLC bearer of the access network device in step 1102 may be one of the at least one RLC bearers.

[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 wireless 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 corresponding relationship includes the corresponding relationship between the identifier of the wireless bearer, the identifier of the second terminal device and the RLC bearer of the access network device.

[0621] It can be seen that in the above technical solution, the adaptation layer entity of the access network device generates second data, and the second data includes first data and second indication information, so that the adaptation layer entity of the access network device can 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 Fig.12 , explains how to correctly deliver uplink data from the access network equipment side.

[0623] See also Fig.12 , Fig.12 A flowchart of another data transmission method provided in an embodiment of the present application is shown below. Fig.12 As shown, the method includes but is not limited to the following steps:

[0624] 1201. An adaptation layer entity of an access network device receives second data from an RLC bearer of the access network device, where the second data includes second indication information.

[0625] Correspondingly, the RLC bearer of the access network device delivers 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 communicates with the first terminal device, that is, the RLC bearer of the access network device is the Uu RLC bearer used when the access network device communicates with the first terminal device.

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

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

[0630] Among them, 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 wireless 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 corresponding relationship includes the corresponding relationship between the identifier of the wireless bearer, the identifier of the second terminal device and the PDCP layer entity of the access network device.

[0633] It can be seen that 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, so that the adaptation layer entity of the access network device can correctly deliver the first data to the PDCP layer entity of the access network device according to the second indication information, thereby improving the reliability of uplink data transmission.

[0634] The following combination Fig.13A and Fig. 13B , exemplarily illustrating the process of transmitting downlink data from the access network device to the second terminal device through the first terminal device, and the process of transmitting uplink data from the second terminal device to the access network device through the first terminal device. It can be understood that Fig.13A In the embodiment, only one PC5 adaptation layer entity is configured for the first terminal device, and the PC5 adaptation layer entity is an adaptation layer entity shared by the PC5 RLC bearer corresponding to at least one remote terminal device; Fig. 13B In the embodiment, a plurality of PC5 adaptation layer entities are configured in the first terminal device, and a PC5 adaptation layer entity among the plurality of PC5 adaptation layer entities is an adaptation layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

[0635] like Fig.13A and Fig. 13BAs shown, in the downlink data transmission scheme, the adaptation layer entity of the access network device receives the first data from the high-level protocol layer entity corresponding to the second terminal device, that is, the adaptation layer entity of the access network device receives the first data from the PDCP layer entity of the access network device, and the PDCP layer entity of the access network device is used to transmit the data corresponding to the second terminal device; then, the action performed by the adaptation layer entity of the access network device can refer to Fig.11 Step 1101-Step 1102: Then, the first terminal device receives the second data from the access network device through the first RLC bearer; then, for Fig.13A The actions performed on the first terminal device can refer to Figure 5A Step 501-step 502, for Fig. 13B The actions performed on the first terminal device can refer to Fig. 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 refer to Fig. 9 Step 901-Step 902. It can be understood that when the second data received by the second terminal device from the first terminal device through the RLC bearer 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 PDCP layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence, and the first correspondence includes the correspondence between the identifier of the radio bearer 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 through the RLC bearer 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 PDCP layer entity of the second terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the second correspondence, and 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 PDCP layer entity of the second terminal device.

[0636] like Fig.13A and Fig. 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; then, the action performed by the adaptation layer entity of the second terminal device can refer to Fig.10 Step 1001-Step 1002: Then, the first terminal device receives second data from the second terminal device through the second RLC bearer; then, for Fig.13A The actions performed on the first terminal device can refer to Fig. 6A Step 601-Step 602, for Fig. 13BThe actions performed on the first terminal device can refer to Fig. 8A Steps 801-802 are not described in detail here; further, the access network device receives the second data from the first terminal device through the RLC bearer of the access network device; then, the actions performed by the access network device can refer to Fig.12 Step 1201-Step 1202. It can be understood that 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, and 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; 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, and 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 RLC bearer of the second terminal device.

[0637] It should be noted that in this application, for the downlink data transmission scheme, the actions performed by the first terminal device can refer to Figure 5A In the case of step 501-step 502, the uplink data transmission scheme and the actions performed by the first terminal device can refer to Fig. 6A Step 601-Step 602: For the downlink data transmission scheme, the actions performed by the first terminal device refer to Fig. 7A Step 701-step 702, its uplink data transmission scheme, the actions performed by the first terminal device can refer to Fig. 8A Step 801-Step 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, which will not be repeated here.

[0639] In addition, this solution may also involve the distinction between the bearer of the second terminal device and the bearer of the first terminal device. Among them, on the Uu link, the wireless bearer of the first terminal device refers to the wireless bearer for communication between the first terminal device and the access network device, and carries the data exchanged between the access network device and the first terminal device. On the sidelink, the wireless bearer of the first terminal device refers to the wireless bearer for communication between the first terminal device and the second terminal device, and carries the data exchanged between the first terminal device and the second terminal device directly through the sidelink.

[0640] As mentioned above, the main function of the adaptation layer is to multiplex data on different radio bearers onto one RLC bearer. The above embodiment only considers the situation where the radio bearers of different terminal devices are multiplexed on the RLC bearer. In addition, the adaptation layer may also multiplex the radio bearer of the second terminal device and the radio bearer of the first terminal device onto one RLC bearer. At this time, the adaptation layer needs to distinguish between the two during the routing process.

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

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

[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 an identifier of the second terminal device in the adaptation layer header in the uplink data transmission, the above method can be used to distinguish the data; if the second terminal device does not perceive the identifier of the second terminal device, the method of carrying indication information can be used.

[0644] In order to distinguish the data of the first terminal device from the data of the second terminal device, another possible way is to limit the data of the first terminal device and the data of the second terminal device from being reused in one RLC bearer. At this time, the UE can know whether the data on different RLC bearers belongs to the second terminal device or the first terminal device according to the configuration of the access network device.

[0645] Secondly, this solution may also involve the distinction between SRB and DRB. It can be understood that the wireless bearer of the second terminal device in the above embodiment includes two types: DRB and SRB. In the prior art, the bearer between a terminal device and an access network device can contain at most SRB1~SRB3 and 32 DRBs. Therefore, the access network device uses 2 bits to identify SRB1~3, corresponding to identifiers 1~3, and uses 5 bits to identify DRB1~DRB32, corresponding to identifiers 1~32. Based on the existing wireless bearer identifier (RB ID), if SRB and DRB are multiplexed in the RLC bearer, the adaptation layer will have no way to distinguish between SRB data and DRB data with the same identifiers 1~3.

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

[0647] Another possible implementation method is that the access network device remaps the SRB ID and DRB ID so that the numbers of the two are not repeated, and informs the first terminal device and the second terminal device of the remapped ID information for adding and identifying the RB ID information on the adaptation layer header. For example, the access network device configures the identifiers of SRB1 to 3 as 1 to 3, and the identifiers of DRB1 to 32 as 4 to 35, and informs the first terminal device and the second terminal device of the correspondence between the SRB / DRB and the identifier. After remapping, the maximum RB ID can be 35, so 6 bits of space need to be reserved on the adaptation layer PDU header to carry the RBID information.

[0648] In another possible manner, the above remapping relationship may be directly given by the protocol, that is, it is specified 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 method is to limit SRB data and DRB data from being reused in one 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 introduces the solution provided by the present application from the perspective of the interaction between various network elements. It can be understood that in order to realize the above functions, the above-mentioned network elements include hardware structures and / or software modules corresponding to the execution of various functions. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in this document, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a computer software-driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

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

[0652] In the case of integrated units, see Fig.14 , Fig.14 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device 1400 can be applied to the above Figure 5A-Figure 12 In the method shown, Fig.14As shown, the communication device 1400 includes: a processing module 1401 and a transceiver module 1402. The processing module 1401 can be one or more processors, and the transceiver module 1402 can be a transceiver or a communication interface. The communication device can be used to implement the first terminal device, the second terminal device, the access network device involved in any of the above method embodiments, or to implement the functions of the network element involved in any of the above method embodiments. The network element or network function can be a network element in a hardware device, a software function running on dedicated hardware, or a virtualization function instantiated on a platform (for example, a cloud platform). Optionally, the communication device 1400 may also include a storage module 1403 for storing program code and data of the communication device 1400.

[0653] In one example, when the communication device is used as a first terminal device or a chip used in a first terminal device, and performs the steps performed by the first terminal device in the above method embodiment. The transceiver module 1402 is used to support communication with a second terminal device or an access network device, etc. The transceiver module 1402 is also used for communication between different protocol layer entities in the first terminal device, such as the transceiver module 1402 is used to communicate with the second terminal device or the access network device, etc. Figures 5A-8B The sending and / or receiving actions performed by the first adaptation layer entity of the first terminal device in the embodiment of the present invention are as follows: specifically, the transceiver module 1402 is used to perform one or more steps in step 501, step 601, step 701, step 801, and / or other processes for the technology described in this document through the first adaptation layer entity of the first terminal device. In addition, the transceiver module 1402 is used to perform one or more steps in step 501, step 601, step 701, step 801, and / or other processes for the technology described in this document through the first adaptation layer entity of the first terminal device. Figures 5A-8B The sending and / or receiving actions performed by the second adaptation layer entity of the first terminal device in the communication device 1400 are as follows, for example, the transceiver module 1402 is used to perform one or more steps of step 502, step 602, step 702, step 802 through the second adaptation layer entity of the first terminal device, and / or other processes for the technology described herein. The processing module 1401 can be used to support the communication device 1400 to perform the processing actions in the above method embodiment, for example, the processing module 1401 is used to perform the processing actions described herein through the first adaptation layer entity of the first terminal device or the second adaptation layer entity of the first terminal device.

[0654] In one example, when the communication device is used as a second terminal device or a chip used in a second terminal device, and performs the steps performed by the second terminal device in the above method embodiment. The transceiver module 1402 is used to support communication with the first terminal device or access network device, etc. The transceiver module 1402 is also used for communication between different protocol layer entities in the second terminal device, such as the transceiver module 1402 is used to communicate through Figure 9-10The processing module 1401 may be used to support the communication device 1400 in performing the processing actions in the above method embodiment. For example, the processing module 1401 is used to perform the processing actions in the above method embodiment through the adaptation layer entity of the second terminal device. Fig.10 Step 1001.

[0655] In one example, when the communication device is used as an access network device or a chip used in an access network device, and performs the steps performed by the access network device in the above method embodiment. The transceiver module 1402 is used to support communication with the first terminal device, etc., and the transceiver module 1402 is also used for communication between different protocol layer entities in the access network device, such as the transceiver module 1402 is used to communicate through Figure 11-Figure 12 The processing module 1401 may be used to support the communication device 1400 to perform the processing actions in the above method embodiment, for example, the processing module 1401 is used to perform the adaptation layer entity of the access network device through the adaptation layer entity of the access network device. Fig.11 Step 1101.

[0656] In a possible implementation, when the first terminal device or the second terminal device or the access network device is a chip, the transceiver module 1402 may be an interface, a pin or a circuit, etc. The interface may be used to input data to be processed to the processor, and may output the processing result of the processor to the outside. In a specific implementation, the interface may be a general purpose input output (GPIO) interface, which may be connected to multiple peripheral devices (such as a display (LCD), a camera (camara), a radio frequency (RF) module, an antenna, etc.). The interface is connected to the processor via a bus.

[0657] The processing module 1401 may be a processor that can execute computer-executable instructions stored in the storage module to enable the chip to execute FIG. 5A to FIG. 12 Embodiments relate to methods.

[0658] Furthermore, the processor may include a controller, an arithmetic unit and a register. Exemplarily, the controller is mainly responsible for instruction decoding and sends control signals for operations corresponding to the instructions. The arithmetic unit is mainly responsible for performing fixed-point or floating-point arithmetic operations, shift operations, and logical operations, etc., and may also perform address operations and conversions. The register is mainly responsible for storing register operands and intermediate operation results temporarily stored during the execution of instructions. In a specific implementation, the hardware architecture of the processor may be an application specific integrated circuit (ASIC) architecture, a microprocessor without interlocked piped stages architecture (MIPS) architecture, an advanced RISC machines (ARM) architecture, or a network processor (NP) architecture, etc. The processor may be single-core or multi-core.

[0659] The storage module may be a storage module within the chip, such as a register, a cache, etc. The storage module may also be a storage module located outside the chip, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0660] It should be noted that the functions corresponding to the processor and the interface can be implemented through hardware design, software design, or a combination of hardware and software, and there is no limitation here.

[0661] Fig.15 This is a simplified schematic diagram of the structure of a terminal device provided in an embodiment of the present application. For ease of understanding and illustration, Fig.15 In the example of terminal device, mobile phone is used as an example. It is understandable that Fig.15 The terminal device involved may be a first terminal device or a second terminal device, which is not limited here. Fig.15As shown, the terminal device includes at least one processor, and may also include a radio frequency circuit, an antenna, and an input / output device. Among them, the processor can be used to process the communication protocol and the communication data, and can also be used to control the terminal device, execute the software program, process the data of the software program, etc. The terminal device may also include a memory, which is mainly used to store software programs and data. These programs involved can be loaded into the memory when the communication device leaves the factory, or loaded into the memory when needed later. The radio frequency circuit is mainly used for conversion between baseband signals and radio frequency signals and processing of radio frequency signals. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves, and the antenna is the antenna provided in the embodiment of the present application. Input / output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. 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 RF circuit. The RF circuit performs RF processing on the baseband signal and then sends the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Fig.15 Only one memory and processor are shown. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device. The memory may be set independently of the processor or may be integrated with the processor, and the embodiments of the present application do not limit this.

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

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

[0665] Fig.16A simplified structural diagram of an access network device provided for an embodiment of the present application. The access network device includes a radio frequency signal transceiving and conversion part and a part 42, and the radio frequency signal transceiving and conversion part further includes a receiving module part 41 and a sending module part 43 (also collectively referred to as a transceiver module). The radio frequency signal transceiving and conversion part is mainly used for the transceiving of radio frequency signals and the conversion of radio frequency signals and baseband signals; part 42 is mainly used for baseband processing, controlling the access network device, etc. The receiving module 41 can also be called a receiver, a receiver, a receiving circuit, etc., and the sending module 43 can also be called a transmitter, a transmitter, a transmitter, a transmitting circuit, etc. Part 42 is usually the control center of the access network device, which can usually be called a processing module, which is used to control the access network device to perform the above-mentioned Figure 11-Figure 12 For details, please refer to the description of the above related parts.

[0666] Part 42 may include one or more boards, each of which may include one or more processors and one or more memories, and the processor is used to read and execute the program in the memory to realize the baseband processing function and the control of the access network device. If there are multiple boards, each board can be interconnected to increase the processing capacity. As an optional implementation, multiple boards may share one or more processors, or multiple boards may share one or more memories, or multiple boards may share one or more processors at the same time.

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

[0668] The embodiment of the present application also provides a communication device, including a processor, a memory, an input interface and an output interface, wherein 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, and the processor calls a computer program stored in the memory to implement Figure 5A-Figure 12 Any of the embodiments shown.

[0669] The present application also provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed, the following is achieved: Figure 5A-Figure 12 Any of the embodiments shown.

[0670] The present application also provides a computer program product, which, when read and executed by a computer, enables the computer to implement Figure 5A-Figure 12 Any of the embodiments shown.

[0671] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiments of the present application. In addition, each network element unit in each embodiment of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software network element units.

[0672] If the above-mentioned integrated unit is implemented in the form of a software network element unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or partly contributed to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a cloud server, or a network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code. The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A data transmission method, characterized in that: The method is executed by a first terminal device or a chip applied to the first terminal device, and 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 signaling radio bearer SRB data or data radio bearer DRB data, the first RLC bearer is used for the first terminal device to communicate with the access network device, and is used to transmit data corresponding to at least one terminal device from the access network device or for transmitting data from the at least one terminal device, and the second terminal device is a terminal device among the at least one terminal device; The second adaptation layer entity of the first terminal device delivers the first data to a second RLC bearer according to the first indication information, and the second RLC bearer is an RLC bearer used when the first terminal device communicates with the second terminal device.

2. The method according to claim 1, characterized in that The method further comprises: The first terminal device determines that the first data is SRB data or DRB data based on the configuration information of the access network device, and the configuration information of the access network device includes the association relationship 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 an identifier of the radio bearer and an identifier of the second terminal device.

4. The method according to any one of claims 1 to 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 indication 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 of the second terminal device and the first corresponding relationship; The first corresponding relationship includes the corresponding relationship between the identifier of the radio 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 an identifier of the radio bearer and an identifier of the second terminal device, the method further includes: The second adaptation layer entity of the first terminal device determines a side link according to an identifier of the second terminal device and a second corresponding relationship; the side link is a side link between the first terminal device and the second terminal device, and the side link corresponds to at least one RLC bearer; the second corresponding relationship includes a corresponding relationship between the identifier information of the unicast connection on the side link 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 according to the identifier of the radio bearer, the identifier of the second terminal device and the first corresponding relationship, including: 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 corresponding relationship.

6. The method according to claim 4, characterized in that The method further comprises: 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 corresponding relationship, including: The second adaptation layer entity of the first terminal device delivers the second 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 corresponding relationship.

7. The method according to claim 6, characterized in that The method further comprises: The first adaptation layer entity of the first terminal device determines the identification information of the unicast connection on the sidelink according to the identification of the second terminal device and the second corresponding relationship; The second correspondence includes a 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 to 7, characterized in that: The method further comprises: The first terminal device receives first configuration information from the access network device, where 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 corresponding relationship is configuration information of the second adaptation layer of the first terminal device; The second corresponding relationship is 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 corresponding relationship is configuration information of the second adaptation layer of the first terminal device; The first correspondence is the correspondence between the identifier of the wireless 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 side link and the identifier of the second terminal device; the third correspondence includes the correspondence between the identifier of the wireless bearer, the identifier information of the unicast connection on the side link 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 to the first terminal device, and the method includes: 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 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 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, where the first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data, and the second terminal device is a terminal device in the at least one terminal device; 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.

10. The method according to claim 9, characterized in that The first indication information includes an identifier of the radio bearer and an identifier of the second terminal device.

11. The method according to claim 9 or 10, characterized in that: If the first indication information includes an identifier of the radio bearer and an identifier of the second terminal device, the method further includes: The first adaptation layer entity of the first terminal device determines the identification of the second terminal device based on the identification information of the unicast connection on the side link and the first corresponding relationship; the side link is a side link for transmitting the first data, and the first corresponding relationship is the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device.

12. The method according to any one of claims 9 to 11, 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 indication information, including: 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 corresponding relationship; The second corresponding relationship includes the corresponding relationship between the identifier of the radio 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 comprises: 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 according to the identifier of the radio bearer, the identifier of the second terminal device, and the second corresponding relationship, including: 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 second corresponding relationship.

14. The method according to any one of claims 9 to 13, characterized in that: The method further comprises: 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 corresponding relationship and a second corresponding relationship; the first configuration information is used to indicate one or more of the following: The first corresponding relationship is configuration information of a first adaptation layer of the first terminal device and / or a second adaptation layer of the first terminal device; The second corresponding relationship is configuration information of the second adaptation layer of the first terminal device; The first correspondence is the correspondence between the identification information of the unicast connection on the side link and the identification of the second terminal device, and the second correspondence includes the correspondence between the identification of the wireless bearer, the identification of the second terminal device and the identification of the first RLC bearer.

15. A data transmission method, characterized in that: The method is executed by a second terminal device or a chip applied in the second terminal device, and includes: The adaptation layer entity of the second terminal device receives second data from a radio link control RLC bearer of the second terminal device; the second data includes second indication information, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device receiving the second data; 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 indication information.

16. 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 delivering 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 corresponding relationship; The first correspondence includes a correspondence between an identifier of the radio bearer and an identifier of a PDCP layer entity of the second terminal device.

17. A data transmission method, characterized in that: The method is performed by a second terminal device or a chip applied to the second terminal device, and 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 receiving 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 indication information.

18. The method according to claim 17, characterized in that If the second indication information includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device delivering 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 corresponding relationship; The first correspondence includes a correspondence between an identifier of the radio bearer and an identifier of the RLC bearer of the second terminal device.

19. The method according to claim 17 or 18, characterized in that The method further comprises: The second terminal device receives first configuration information from the access network device, where the first configuration information includes one of the following: a first correspondence relationship and a second correspondence relationship, where the first configuration information is used to indicate that the first correspondence relationship or the second correspondence relationship is configuration information of the adaptation layer of the second terminal device; The first correspondence includes a correspondence between an identifier of the radio bearer and an identifier of an RLC bearer of the second terminal device; The second corresponding relationship includes a corresponding relationship 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.

20. A data transmission method, characterized in that: The method is performed by an access network device or a chip applied to the access network device, and 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 receiving 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 indication information.

21. The method according to claim 20, characterized in that The second indication information includes an identifier of the radio bearer and an identifier of the second terminal device, and 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 corresponding relationship; The first corresponding relationship includes the corresponding relationship between the identifier of the wireless bearer, the identifier of the second terminal device and the RLC bearer of the access network device.

22. A data transmission method, characterized in that: The method is performed by an access network device or a chip used in the access network device, and 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, and the second indication information is used to indicate the radio bearer corresponding to the second terminal device receiving the second data; The adaptation layer entity of the access network device delivers the second data to the Packet Data Convergence Protocol PDCP layer entity of the access network device according to the second indication information.

23. The method according to claim 22, characterized in that The second indication information includes an identifier of a radio bearer and an identifier of a second terminal device, and 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 corresponding relationship; The first corresponding relationship includes the corresponding relationship between the identifier of the wireless bearer, the identifier of the second terminal device and the PDCP layer entity of the access network device.

24. A communication device, characterized in that: The method comprises a processor and a memory, wherein the processor calls a computer program stored in the memory to implement the method according to any one of claims 1 to 8, or implements the method according to any one of claims 9 to 14, or implements the method according to any one of claims 15 to 16, or implements the method according to any one of claims 17 to 19, or implements the method according to any one of claims 20 to 21, or implements the method according to any one of claims 22 to 23.

25. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which, when executed, implements the method according to any one of claims 1 to 8, or implements the method according to any one of claims 9 to 14, or implements the method according to any one of claims 15 to 16, or implements the method according to any one of claims 17 to 19, or implements the method according to any one of claims 20 to 21, or implements the method according to any one of claims 22 to 23.

26. A computer program product comprising instructions, which, when executed on a computer, causes the method of any one of claims 1 to 8 to be executed, or the method of any one of claims 9 to 14 to be implemented, or the method of any one of claims 15 to 16 to be implemented, or the method of any one of claims 17 to 19 to be implemented, or the method of any one of claims 20 to 21 to be implemented, or the method of any one of claims 22 to 23 to be implemented.

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