CN115996108A

CN115996108A - Data transmission method and related device

Info

Publication number: CN115996108A
Application number: CN202111223655.1A
Authority: CN
Inventors: 潘晓丹; 彭文杰
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-10-20
Filing date: 2021-10-20
Publication date: 2023-04-21
Also published as: WO2023065999A1

Abstract

The application provides a data transmission method and a related device, because a first adaptation layer entity of a first terminal device can submit first data and first indication information to a second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device can accurately submit the first data to a second RLC (radio link control) bearer according to the first indication information, and reliability of downlink data transmission is improved.

Description

Data transmission method and related device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a data transmission method and a related device.

Background

Currently, in the relay technology, a remote terminal device may communicate with a base station through a relay terminal device. Data packets, such as for a remote terminal device, may be relayed on radio link control (radio link control, RLC) bearers of the relay terminal device, where one RLC bearer may include radio link control (radio link control, RLC) layer entities and a logical channel of a medium access control (media access control, MAC) layer. It can be appreciated that in the relay technology, an adaptation (adaptation) layer may be added between the RLC layer and the packet data convergence protocol (packet data convergence protocol, PDCP) layer to implement multiplexing and demultiplexing of bearers. I.e. data on at least one radio bearer supporting different remote terminal devices may be multiplexed onto one RLC bearer or data on one RLC bearer may be split into different radio bearers.

However, in the existing protocol design, when the base station performs RLC bearer configuration, one RLC bearer corresponds to one PDCP entity or one Radio Bearer (RB), i.e., multiplexing and demultiplexing of bearers are not supported. There is a problem in that downlink data of a remote terminal apparatus cannot be properly delivered when Radio Bearers (RBs) are multiplexed and demultiplexed. Therefore, in the RB multiplexing and demultiplexing scenario, how to correctly submit downlink data is a technical problem to be solved in the current stage.

Disclosure of Invention

The application provides a data transmission method and a related device, which realize the correct delivery of downlink data.

In a first aspect, a data transmission method is provided, where the method is applied to a first terminal device, where the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, where the first RLC bearer is used to transmit data corresponding to at least one terminal device from the access network device and/or where the first RLC bearer is used to transmit data from the at least one terminal device, and the method includes:

the first adaptation layer entity of the first terminal equipment submits first data and first indication information to a second adaptation layer entity of the first terminal equipment, wherein the first indication information is used for indicating a radio bearer corresponding to a second terminal equipment for transmitting the first data, and the second terminal equipment is terminal equipment in the at least one terminal equipment;

The second adaptation layer entity of the first terminal equipment submits the first data to a second RLC bearer according to the first indication information, wherein the second RLC bearer is used when the first terminal equipment communicates with the second terminal equipment.

In the above technical solution, the first adaptation layer entity of the first terminal device submits 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 submit the first data to the second RLC bearer according to the first indication information, thereby improving reliability of downlink data transmission.

Optionally, the first indication information includes an identifier of the radio bearer and an identifier of the second terminal device; or alternatively, the first and second heat exchangers may be,

the first indication information includes an identification of the radio bearer and identification information of a unicast connection on a side link, the side link being between the first terminal device and the second terminal device.

It can be seen that in the above technical solution, the first adaptation layer entity of the first terminal device submits 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 submit the first data to the correct RLC bearer.

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

the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and a first corresponding relation;

the first correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and an identity of the second RLC bearer.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit the data, and the reliability of downlink data transmission is improved.

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:

the second adaptation layer entity of the first terminal equipment determines a side uplink according to the identification of the second terminal equipment and a second corresponding relation; the side link is a side link between the first terminal equipment and the second terminal equipment, and at least one RLC bearer is corresponding to the side link; the second corresponding relation comprises a corresponding relation between the identification information of unicast connection on the side link and the identification of the second terminal equipment;

The second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a first correspondence, including:

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

It can be seen that, in the above technical solution, in a case where the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device needs to determine the side uplink according to the identifier of the second terminal device and the second correspondence, so that data can be submitted to the corresponding side uplink; further, the first data can be submitted to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly submit the data, thereby improving reliability of downlink data transmission.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of unicast connection on a side link, where the side link is a side link between the first terminal device and the second terminal device, the side link corresponds to at least one RLC bearer, and the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a first correspondence relationship, where the method includes:

It can be seen that, in the above technical solution, in a case where the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier information of the unicast connection on the side uplink to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device may submit the data to the corresponding side uplink; further, the first data is submitted to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly submit the data, and reliability of downlink data transmission is improved.

Optionally, the first indication information further includes an identifier of the second terminal device.

In the above technical solution, when the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the first adaptation layer entity of the first terminal device may also submit 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 may correctly submit the data, thereby improving reliability of downlink data transmission.

Optionally, 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 comprises an identifier of the radio bearer, or the second indication information comprises an identifier of the radio bearer and an identifier of the second terminal device;

the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer of the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including:

And the second adaptation layer entity of the first terminal equipment submits the second data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation.

In the above technical solution, the second adaptation layer entity of the first terminal device submits the second data to the second RLC bearer, so that the second adaptation layer entity of the first terminal device can correctly submit the data, thereby improving reliability of downlink data transmission.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of a unicast connection on a side link, where the side link is a side link between the first terminal device and the second terminal device, the second adaptation layer entity of the first terminal device submits 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 submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier information of unicast connection on the side link and a third corresponding relation;

The third correspondence includes a correspondence between an identity of the radio bearer, identity information of a unicast connection on the side link, and an identity of the second RLC bearer.

It can be seen that, in the above technical solution, in a case where the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier information of the unicast connection on the side uplink to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device may submit the data to the corresponding side uplink; further, the first data is submitted to the second RLC bearer according to the identifier of the radio bearer, the identifier 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 submit the data, and reliability of downlink data transmission is improved.

Optionally, the method further comprises:

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 an identification of the radio bearer;

the second adaptation layer entity of the first terminal device submits 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 side link, and a third correspondence, including:

And the second adaptation layer entity of the first terminal equipment submits 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 side link and a third corresponding relation.

In the above technical solution, the second adaptation layer entity of the first terminal device submits the third data to the second RLC bearer, so that the second adaptation layer entity of the first terminal device can correctly submit the data, thereby improving reliability of downlink data transmission.

Optionally, the method further comprises:

the first adaptation layer entity of the first terminal equipment determines the identification information of unicast connection on the side link according to the identification of the second terminal equipment and the second corresponding relation;

the second correspondence includes a correspondence between identification information of unicast connection on the sidelink and identification of the second terminal device.

It can be seen that in the above technical solution, a transition between the identification of the second terminal device and the identification information of the unicast connection on the side link is achieved.

Optionally, the method further comprises:

the first terminal device receives first configuration information from an access network device, the first configuration information including one or more of: the first configuration information is used for indicating one or more of the following:

The first corresponding relation is configuration information of a second adaptation layer of the first terminal equipment;

the second corresponding relation is configuration information of a first adaptation layer of the first terminal equipment and/or a second adaptation layer of the first terminal equipment;

the third corresponding relation is configuration information of a second adaptation layer of the first terminal equipment;

the first correspondence is a correspondence between the identifier of the radio bearer, the identifier of the second terminal device and the identifier of the second RLC bearer, the second correspondence includes a correspondence between the identifier information of the unicast connection on the side link and the identifier of the second terminal device, and the third correspondence includes a correspondence between the identifier of the radio bearer, the identifier information of the unicast connection on the side link and the identifier of the second RLC bearer.

According to the technical scheme, the first terminal equipment receives the first configuration information from the access network equipment, so that the first terminal equipment can correctly submit data between different protocol layer entities according to the first configuration information, and the reliability of data transmission is improved.

In a second aspect, a data transmission method is provided, where the method is applied to a first terminal device, where the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, where the first RLC bearer is used to transmit data corresponding to at least one terminal device from the access network device and/or where the first RLC bearer is used to transmit data from the at least one terminal device, and the method includes:

and the second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the first indication information.

In the above technical solution, the first adaptation layer entity of the first terminal device submits 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 submit the first data to the first RLC bearer according to the first indication information, thereby improving reliability of uplink data transmission.

the first adaptation layer entity of the first terminal equipment determines the identification of the second terminal equipment according to the identification information of unicast connection on the side link and the first corresponding relation; the side link is a side link for transmitting the first data, and the first correspondence is a correspondence between identification information of unicast connection on the side link and identification of the second terminal device.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of a unicast connection on a side downlink, where the side downlink is a side downlink between the first terminal device and the second terminal device, the method further includes:

The second adaptation layer entity of the first terminal equipment determines the identification of the second terminal equipment according to the identification information of unicast connection on the side link and the first corresponding relation; the side link is a side link for transmitting the first data, and the first correspondence is a correspondence between identification information of unicast connection on the side link and identification of the second terminal device.

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

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

the second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and a second corresponding relation;

the second correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and an identity of the first RLC bearer.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit the data, and the reliability of uplink data transmission is improved.

Optionally, 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 comprises an identifier of the radio bearer and an identifier of the second terminal equipment;

the second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a second correspondence, including:

and the second adaptation layer entity of the first terminal equipment submits the second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and a second corresponding relation.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment delivers the second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately deliver the data, and the reliability of uplink data transmission is improved.

Optionally, the method further comprises:

The first terminal equipment receives first configuration information from access network equipment; the first configuration information includes one or more of: the first corresponding relation and the second corresponding relation; the first configuration information is used to indicate one or more of:

the first corresponding relation is configuration information of a first adaptation layer of the first terminal equipment and/or a second adaptation layer of the first terminal equipment;

the second corresponding relation is configuration information of a second adaptation layer of the first terminal equipment;

the first correspondence is a correspondence between identification information of unicast connection on the side link and identification of the second terminal device, and the second correspondence includes a correspondence between identification of the radio bearer, identification of the second terminal device and identification of the first RLC bearer.

In a third aspect, a data transmission method is provided, where the method is applied to a second terminal device, and the method 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 comprises second indication information, wherein the second indication information is used for indicating the radio bearer corresponding to the second terminal equipment receiving the second data;

and the adaptation layer entity of the second terminal equipment submits the second data to the packet data convergence protocol PDCP layer entity of the second terminal equipment according to the second indication information.

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 submit the first data to the PDCP layer entity of the second terminal device according to the second indication information, thereby improving reliability of downlink data transmission.

Optionally, if the second indication information includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device submits 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 equipment submits the second data to the PDCP layer entity of the second terminal equipment according to the identification of the radio bearer and the first corresponding relation;

The first correspondence includes a correspondence between an identity of the radio bearer and an identity of a PDCP layer entity of the second terminal device.

In the above technical solution, the adaptation layer entity of the second terminal device submits the second data to the PDCP layer entity of the second terminal device according to the identifier of the radio bearer and the first correspondence, so that the adaptation layer entity of the second terminal device can correctly submit the downlink data, thereby improving the reliability of downlink data transmission.

In a fourth aspect, a data transmission method is provided, where the method is applied to a second terminal device, and the method includes:

the adaptation layer entity of the second terminal equipment generates second data; the second data comprises first data and second indication information, the first data is data received by an adaptation layer entity of the second terminal equipment from a packet data convergence protocol PDCP layer entity of the second terminal equipment, and the second indication information is used for indicating the radio bearer corresponding to the second terminal equipment receiving the second data;

and the adaptation layer entity of the second terminal equipment submits the second data to the Radio Link Control (RLC) bearer of the second terminal equipment according to the second indication information.

In the above technical solution, the adaptation layer entity of the second terminal device generates the second data, where the second data includes the first data and the second indication information, so that the adaptation layer entity of the second terminal device can correctly submit the second data to the RLC bearer of the second terminal device according to the second indication information, thereby improving reliability of uplink data transmission.

Optionally, if the second indication information includes the identifier of the radio bearer, the adaptation layer entity of the second terminal device submits 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 equipment submits the second data to the RLC bearer of the second terminal equipment according to the identifier of the radio bearer and the first corresponding relation;

the first correspondence includes a correspondence between an identity of the radio bearer and an identity of an RLC bearer of the second terminal device.

According to the technical scheme, the adaptation layer entity of the second terminal equipment submits the second data to the RLC bearer of the second terminal equipment according to the identifier of the radio bearer and the first corresponding relation, so that the adaptation layer entity of the second terminal equipment can correctly submit the uplink data, and the reliability of uplink data transmission is improved.

Optionally, the method further comprises:

the second terminal device receives first configuration information from an access network device, the first configuration information comprising one of: the first configuration information is used for indicating that the first corresponding relation or the second corresponding relation is the configuration information of the adaptation layer of the second terminal equipment;

the first correspondence includes a correspondence between an identification of the radio bearer and an identification of an RLC bearer of the second terminal device;

the second correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and an identity of an RLC bearer of the second terminal device.

According to the technical scheme, the second terminal equipment receives the first configuration information from the access network equipment, so that the first terminal equipment can correctly submit data between different protocol layer entities according to the first configuration information, and the reliability of data transmission is improved.

In a fifth aspect, a data transmission method is provided, where the method is applied to an access network device, and the method includes:

the adaptation layer entity of the access network equipment generates second data; the second data comprises first data and second indication information, the first data is data received by an adaptation layer entity of the access network equipment from a packet data convergence protocol PDCP layer entity of the access network equipment, and the second indication information is used for indicating a radio bearer corresponding to second terminal equipment for receiving the second data;

And the adaptation layer entity of the access network equipment submits the second data to the Radio Link Control (RLC) bearer of the access network equipment according to the second indication information.

According to the technical scheme, the adaptation layer entity of the access network equipment generates the second data, and the second data comprises the first data and the second indication information, so that the adaptation layer entity of the access network equipment can correctly submit the second data to the RLC bearing of the access network equipment according to the second indication information, and the reliability of downlink data transmission is improved.

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 submits 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 equipment submits the second data to the RLC bearer of the access network equipment according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation;

the first correspondence includes a correspondence between an identification of the radio bearer, an identification of the second terminal device, and an RLC bearer of the access network device.

According to the technical scheme, the adaptation layer entity of the access network equipment delivers the second data to the RLC bearer of the access network equipment according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the adaptation layer entity of the access network terminal equipment can accurately deliver the downlink data, and the reliability of the downlink data transmission is improved.

In a sixth aspect, a data transmission method is provided, where the method is applied to an access network device, and the method includes

The adaptation layer entity of the access network device receives second data from a Radio Link Control (RLC) bearer of the access network device; the second data comprises second indication information, wherein the second indication information is used for indicating a radio bearer corresponding to second terminal equipment for receiving the second data;

and the adaptation layer entity of the access network equipment submits the second data to the packet data convergence protocol PDCP layer entity of the access network equipment according to the second indication information.

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 submit the first data to the PDCP layer entity of the access network device according to the second indication information, thereby improving reliability of uplink data transmission.

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 submits 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 equipment delivers the second data to the PDCP layer entity of the access network equipment according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation;

the first correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and a PDCP layer entity of the access network device.

According to the technical scheme, the adaptation layer entity of the access network equipment delivers the second data to the PDCP layer entity of the access network equipment according to the identification of the wireless bearing, the identification of the second terminal equipment and the first corresponding relation, so that the adaptation layer entity of the access network equipment can accurately deliver the uplink data, and the reliability of the uplink data transmission is improved.

In a seventh aspect, a data transmission method is provided, where the method is applied to a first terminal device, where the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, where the first RLC bearer is used to transmit data corresponding to at least one terminal device from the access network device and/or where the first RLC bearer is used to transmit data from the at least one terminal device, and the method includes:

The first adaptation layer entity of the first terminal equipment submits first data and second indication information to the second adaptation layer entity of the first terminal equipment according to the first indication information; the first indication information is used for indicating a second terminal device for transmitting the first data, the second indication information is used for indicating a radio bearer, 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 equipment submits 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 apparatus communicates with the second terminal apparatus.

According to the technical scheme, the first adaptation layer entity of the first terminal equipment submits the first data and the second indication information to the second adaptation layer entity of the first terminal equipment according to the first indication information, so that the second adaptation layer entity of the first terminal equipment can accurately submit the first data to the second RLC bearer according to the second indication information, and reliability of uplink data transmission is improved.

Optionally, the first indication information is an identifier of the second terminal device, and the first adaptation layer entity of the first terminal device submits, according to the first indication information, first data and second indication information to the second adaptation layer entity of the first terminal device, including:

The first adaptation layer entity of the first terminal equipment determines a second adaptation layer entity of the first terminal equipment from a plurality of adaptation layer entities according to the identification of the second terminal equipment and a first corresponding relation;

the first adaptation layer entity of the first terminal equipment submits the first data and the second indication information to the second adaptation layer entity of the first terminal equipment;

the first correspondence includes one or more of:

a correspondence between the identity of the second terminal device and the identity of the second adaptation layer entity of the first terminal device;

the corresponding relation between the identification of the second terminal equipment and the identification information of unicast connection on a side uplink, wherein the side uplink is the side uplink between the first terminal equipment and the second terminal equipment;

the second adaptation layer entity of the first terminal device corresponds to the side uplink, or the second adaptation layer entity of the first terminal device corresponds to the second terminal device.

It can be seen that in the above technical solution, the first adaptation layer entity of the first terminal device determines the second adaptation layer entity of the first terminal device from the plurality of adaptation layer entities according to the identifier of the second terminal device and the first correspondence, so that the first adaptation layer entity of the first terminal device may submit the first data and the second indication information to the second adaptation layer entity of the first terminal device, and thus the first adaptation layer entity of the first terminal device may correctly submit the downlink data.

Optionally, the second indication information includes an identifier of a radio bearer, and the second adaptation layer entity of the first terminal device submits the first data to a second RLC bearer according to the second indication information, including:

the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer and a second corresponding relation; the second correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and an identity of the second RLC bearer.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit the downlink data, and the reliability of downlink data transmission is improved.

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 submits the first data to the second RLC bearer according to the identifier of the radio bearer and a second correspondence, including:

And the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit the downlink data, and the reliability of the downlink data transmission is improved.

Optionally, the method further comprises:

generating second data by a second adaptation layer entity of the first terminal equipment; the second data comprises the first data and third indication information; the third indication information comprises an identifier of the radio bearer, or the third indication information comprises an identifier of the radio bearer and an identifier of the second terminal device;

the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including:

And the second adaptation layer entity of the first terminal equipment submits the second data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment submits second data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit downlink data, and the reliability of downlink data transmission is improved.

Optionally, the method further comprises:

the first terminal equipment receives first configuration information from access network equipment; the first configuration information includes one or more of: the first corresponding relation and the second corresponding relation;

the first configuration information is used to indicate one or more of:

the first corresponding relation is configuration information of a first adaptation layer of the first terminal equipment;

the first correspondence includes one or more of:

the corresponding relation between the identifier of the second terminal equipment and the identifier information of unicast connection on a side uplink, wherein the side uplink is the side uplink between the first terminal equipment and the second terminal equipment, and the side uplink corresponds to the second adaptation layer entity;

the second correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and an identity of the second RLC bearer.

In an eighth aspect, a data transmission method is provided, where the method is applied to a first terminal device, where the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, where the first RLC bearer is used to transmit data corresponding to at least one terminal device from the access network device and/or where the first RLC bearer is used to transmit data from the at least one terminal device, and the method includes:

The first adaptation layer entity of the first terminal equipment submits first data and first indication information to the second adaptation layer entity of the first terminal equipment; the first indication information is used for indicating a radio bearer, and the second terminal equipment is terminal equipment in the at least one terminal equipment;

Optionally, the method further comprises:

the first adaptation layer entity of the first terminal equipment determines the identification of the second terminal equipment according to the second indication information and the second corresponding relation;

the first adaptation layer entity of the first terminal equipment submits the identification of the second terminal equipment to the second adaptation layer entity of the first terminal equipment;

Wherein the second indication information includes one or more of: identification of the first adaptation layer entity and identification information of unicast connection on a side uplink, wherein the side uplink is between the first terminal equipment and the second terminal equipment;

the second correspondence includes one or more of:

the corresponding relation between the identification of the first adaptation layer entity of the first terminal equipment and the identification of the second terminal equipment;

and the corresponding relation between the identification information of the unicast connection on the side link and the identification of the second terminal equipment.

It can be seen that in the above technical solution, when the first adaptation layer entity of the first terminal device does not acquire the identifier of the second terminal device, 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 correspondence, so as to implement conversion between the second indication information and the identifier of the second terminal device.

Optionally, the method further comprises:

the second adaptation layer entity of the first terminal equipment determines the identification of the second terminal equipment according to the third indication information and the third corresponding relation;

Wherein the third indication information includes one or more of: the identification of the second adaptation layer entity and the identification information of unicast connection on a side uplink, wherein the side uplink is the side uplink between the first terminal equipment and the second terminal equipment, and the side uplink corresponds to the first adaptation layer entity;

the third correspondence may include one or more of:

a correspondence between the identity of the second adaptation layer entity of the first terminal device and the identity of the second terminal device;

It can be seen that in the above technical solution, in a case that 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 second adaptation layer entity of the first terminal device determines the identifier of the second terminal device according to the second indication information and the third correspondence, thereby implementing conversion between the second indication information and the identifier of the second terminal device.

Optionally, the first indication information includes an identifier of the radio bearer, and the second adaptation layer entity of the first terminal device submits the first data to a first RLC bearer according to the first indication information, including:

The second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and a first corresponding relation;

the first correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and an identity of the first RLC bearer.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit the data, and the reliability of uplink data transmission is improved.

Optionally, the method further comprises:

generating second data by a second adaptation layer entity of the first terminal equipment; the second data comprises the first data, the identifier of the radio bearer and the identifier of the second terminal device, or the second data comprises the first data and the identifier of the radio bearer;

the second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a first correspondence, including:

And the second adaptation layer entity of the first terminal equipment submits the second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation.

According to the technical scheme, the second adaptation layer entity of the first terminal equipment delivers the second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately deliver the data, and the reliability of uplink data transmission is improved.

Optionally, the method further comprises:

the first terminal equipment receives second configuration information from access network equipment; the second configuration information includes one or more of: the first corresponding relation, the second corresponding relation and the third corresponding relation;

the second configuration information is used to indicate one or more of:

the second corresponding relation is configuration information of a first adaptation layer of the first terminal equipment;

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

the second correspondence includes one or more of:

the corresponding relation between the identification information of the unicast connection on the side link and the identification of the second terminal equipment;

the third correspondence may include one or more of:

According to the technical scheme, the first terminal equipment receives the second configuration information from the access network equipment, so that the first terminal equipment can correctly submit data between different protocol layer entities according to the second configuration information, and the reliability of data transmission is improved.

A ninth aspect provides a communication apparatus, the communication apparatus being a first terminal device, the first terminal device communicating with an access network device using a first radio link to control an RLC bearer, the first RLC bearer being for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer being for transmitting data from the at least one terminal device, the first terminal device comprising a transceiver module,

The transceiver module is configured to submit, by using a first adaptation layer entity of the first terminal device, first data and first indication information to a second adaptation layer entity of the first terminal device, where the first indication information is used to indicate a radio bearer corresponding to a second terminal device that transmits the first data, and the second terminal device is a terminal device in the at least one terminal device;

the transceiver module is configured to deliver, by the second adaptation layer entity of the first terminal device, the first data to a second RLC bearer according to the first indication information, where the second RLC bearer is an RLC bearer used when the first terminal device communicates with the second terminal device.

Optionally, when the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the first indication information, the transceiver module is configured to submit, through the second adaptation layer entity of the first terminal device, the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a first correspondence;

Optionally, if the first indication information includes an identifier of the radio bearer and an identifier of the second terminal device, the first terminal device further includes a processing module, where the processing module is configured to determine, by using the second adaptation layer entity of the first terminal device, a side uplink according to the identifier of the second terminal device and a first correspondence; the side link is a side link between the first terminal equipment and the second terminal equipment, and at least one RLC bearer is corresponding to the side link; the first corresponding relation comprises a corresponding relation between the identification information of unicast connection on the side link and the identification of the second terminal equipment;

when the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the radio bearer identifier, the second terminal device identifier and the first correspondence, the processing module is configured to submit the first data to the second RLC bearer in the at least one RLC bearer according to the radio bearer identifier, the second terminal device identifier and the first correspondence through the second adaptation layer entity of the first terminal device.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of a unicast connection on a side link, where 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 submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a first correspondence, the transceiver module is configured to submit, by using the second adaptation layer entity of the first terminal device, the first data to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence.

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

And when the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer in the at least one RLC bearer according to the radio bearer identifier, the second terminal equipment identifier and the first corresponding relation, the transceiver module is configured to submit the second data to the second RLC bearer in the at least one RLC bearer through the second adaptation layer entity of the first terminal equipment according to the radio bearer identifier, the second terminal equipment identifier and the first corresponding relation.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of a unicast connection on a side link, where the side link is a side link between the first terminal device and the second terminal device, and when the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the first indication information, the transceiver module is configured to submit, by using the second adaptation layer entity of the first terminal device, 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 side link, and a third correspondence;

Optionally, the first terminal device further includes a processing module, where the processing module is configured to generate third data through the second adaptation layer entity of the first terminal device; the third data includes the first data and second indication information; the second indication information includes an identification of the radio bearer;

Optionally, the first terminal device further includes a processing module, where the processing module is further configured to determine, by using the first adaptation layer entity of the first terminal device, identification information of unicast connection on the side downlink according to an identification of a second terminal device and a second correspondence;

Optionally, the transceiver module is further configured to receive first configuration information from an access network device, where the first configuration information includes one or more of: the first configuration information is used for indicating one or more of the following:

In a tenth aspect, a communication apparatus is provided, the communication apparatus being a first terminal device, the first terminal device communicating with an access network device using a first radio link to control an RLC bearer, the first RLC bearer being for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer being for transmitting data from the at least one terminal device, the first terminal device comprising a transceiver module,

the transceiver module is configured to submit, by the second adaptation layer entity of the first terminal device, the first data to the first RLC bearer according to the first indication information.

Optionally, if the first indication information includes the identifier of the radio bearer and the identifier of the second terminal device, the first terminal device further includes a processing module, where the processing module is configured to determine, by using a first adaptation layer entity of the first terminal device, the identifier of the second terminal device according to the identifier 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 a correspondence between identification information of unicast connection on the side link and identification of the second terminal device.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of unicast connection on a side downlink, where the side downlink is a side downlink between the first terminal device and the second terminal device, the first terminal device further includes a processing module, where the processing module is configured to determine, by using a second adaptation layer entity of the first terminal device, the identifier of the second terminal device according to the identifier information of unicast connection on the side downlink and a first correspondence; the side link is a side link for transmitting the first data, and the first correspondence is a correspondence between identification information of unicast connection on the side link and identification of the second terminal device.

Optionally, when the second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the first indication information, the transceiver module is configured to submit, through the second adaptation layer entity of the first terminal device, the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a second correspondence;

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

when the second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the radio bearer identifier, the second terminal device identifier and the second correspondence, the transceiver module is configured to submit the second data to the first RLC bearer through the second adaptation layer entity of the first terminal device according to the radio bearer identifier, the second terminal device identifier and the second correspondence.

Optionally, the transceiver module is further configured to receive first configuration information from an access network device; the first configuration information includes one or more of: the first corresponding relation and the second corresponding relation; the first configuration information is used to indicate one or more of:

In an eleventh aspect, there is provided a communication apparatus that is a second terminal device, the second terminal device comprising a transceiver module,

the transceiver module is configured 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 comprises second indication information, wherein the second indication information is used for indicating the radio bearer corresponding to the second terminal equipment receiving the second data;

The transceiver module is configured to deliver, by the adaptation layer entity of the second terminal device, the second data to a packet data convergence protocol PDCP layer entity of the second terminal device according to the second indication information.

Optionally, if the second indication information includes an identifier of the radio bearer, when the adaptation layer entity of the second terminal device submits the second data to the PDCP layer entity of the second terminal device according to the second indication information, the transceiver module is configured to submit, by using the adaptation layer entity of the second terminal device, 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;

In a twelfth aspect, a communication apparatus is provided, the communication apparatus being a second terminal device, the second terminal device comprising a transceiver module and a processing module,

the processing module is configured to generate second data through an adaptation layer entity of the second terminal device; the second data comprises first data and second indication information, the first data is data received by an adaptation layer entity of the second terminal equipment from a packet data convergence protocol PDCP layer entity of the second terminal equipment, and the second indication information is used for indicating the radio bearer corresponding to the second terminal equipment receiving the second data;

And the receiving and transmitting module is used for delivering the second data to the Radio Link Control (RLC) bearer of the second terminal equipment according to the second indication information through the adaptation layer entity of the second terminal equipment.

Optionally, if the second indication information includes an identifier of the radio bearer, when the adaptation layer entity of the second terminal device submits the second data to the RLC bearer of the second terminal device according to the second indication information, the transceiver module is configured to submit, by using the adaptation layer entity of the second terminal device, the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer and the first correspondence;

Optionally, the transceiver module is further configured to receive first configuration information from an access network device, where the first configuration information includes one of: the first configuration information is used for indicating that the first corresponding relation or the second corresponding relation is the configuration information of the adaptation layer of the second terminal equipment;

In a thirteenth aspect, a communication apparatus is provided, the communication apparatus being an access network device, the access network device comprising a transceiver module and a processing module,

the processing module is configured to generate second data through an adaptation layer entity of the access network device; the second data comprises first data and second indication information, the first data is data received by an adaptation layer entity of the access network equipment from a packet data convergence protocol PDCP layer entity of the access network equipment, and the second indication information is used for indicating a radio bearer corresponding to second terminal equipment for receiving the second data;

the transceiver module is configured to deliver, by using the adaptation layer entity of the access network device, the second data to a radio link control RLC bearer of the access network device according to the second indication information, where the RLC bearer of the access network device is an RLC bearer used when the access network device communicates with the first terminal device.

Optionally, the second indication information includes an identifier of the radio bearer and an identifier of the second terminal device, and when the adaptation layer entity of the access network device submits the second data to the RLC bearer of the access network device according to the second indication information, the transceiver module is configured to submit, by using the adaptation layer entity of the access network device, the second data to the RLC bearer of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence;

In a fourteenth aspect, there is provided a communication apparatus, the communication apparatus being an access network device, the access network device comprising a transceiver module,

the transceiver module is configured to receive, through an adaptation layer entity of the access network device, second data from a radio link control RLC bearer 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, where the second indication information is used to indicate a radio bearer corresponding to a second terminal device that receives the second data;

The transceiver module is configured to deliver, by the adaptation layer entity of the access network device, the second data to a packet data convergence protocol PDCP layer entity of the access network device according to the second indication information.

Optionally, the second indication information includes an identifier of a radio bearer and an identifier of a second terminal device, and when the adaptation layer entity of the access network device submits the second data to the PDCP layer entity of the access network device according to the second indication information, the transceiver module is configured to submit, by using the adaptation layer entity of the access network device, the second data to the PDCP layer entity of the access network device according to the identifier of the radio bearer, the identifier of the second terminal device and the first correspondence;

A fifteenth aspect provides a communications apparatus, the communications apparatus being a first terminal device which, when communicating with an access network device, controls an RLC bearer using a first radio link, the first RLC bearer being for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer being for transmitting data from the at least one terminal device, the first terminal device comprising a transceiver module,

The receiving and transmitting module is used for delivering the first data and the second indication information to a second adaptation layer entity of the first terminal equipment according to the first indication information through the first adaptation layer entity of the first terminal equipment; the first indication information is used for indicating a second terminal device for transmitting the first data, the second indication information is used for indicating a radio bearer, and the second terminal device is a terminal device in the at least one terminal device;

the transceiver module is configured to submit, by using a second adaptation layer entity of the first terminal device, 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 apparatus communicates with the second terminal apparatus.

Optionally, the first terminal device further includes a processing module, where the first indication information is an identifier of the second terminal device, and when the first adaptation layer entity of the first terminal device submits, according to the first indication information, first data and second indication information to the second adaptation layer entity of the first terminal device, the processing module is configured to determine, by using the first 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 a first correspondence, the second adaptation layer entity of the first terminal device;

The transceiver module is further configured to submit the first data and the second indication information to a second adaptation layer entity of the first terminal device through the first adaptation layer entity of the first terminal device;

the first correspondence includes one or more of:

Optionally, the second indication information includes an identifier of a radio bearer, and when the second adaptation layer entity of the first terminal device submits the first data to a second RLC bearer according to the second indication information, the transceiver module is configured to submit, through the second adaptation layer entity of the first terminal device, the first data to the second RLC bearer according to the identifier of the radio bearer and a second correspondence; the second correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and an identity of the second RLC bearer.

Optionally, the second indication information further includes an identifier of the second terminal device, and when the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the identifier of the radio bearer and the second corresponding relationship, the transceiver module is configured to submit the first data to the second RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device, and the second corresponding relationship.

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

and when the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, the transceiver module is used for submitting the second data to the second RLC bearer through the second adaptation layer entity of the first terminal equipment according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation.

Optionally, the transceiver module is further configured to receive first configuration information from an access network device; the first configuration information includes one or more of: the first corresponding relation and the second corresponding relation;

the first configuration information is used to indicate one or more of:

the first correspondence includes one or more of:

A sixteenth aspect provides a communication apparatus, the communication apparatus being a first terminal device, the first terminal device controlling an RLC bearer using a first radio link when communicating with an access network device, the first RLC bearer being for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer being for transmitting data from the at least one terminal device, the first terminal device comprising a transceiver module for handing over first data and first indication information to a second adaptation layer entity of the first terminal device by a first adaptation layer entity of the first terminal device; the first indication information is used for indicating a radio bearer, and the second terminal equipment is terminal equipment in the at least one terminal equipment; and the second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the first indication information.

Optionally, the first terminal device further includes a processing module, where the processing module is configured to determine, by using a first adaptation layer entity of the first terminal device, an identifier of the second terminal device according to the second indication information and the second correspondence;

the transceiver module is configured to submit, by using a first adaptation layer entity of the first terminal device, an identifier of the second terminal device to a second adaptation layer entity of the first terminal device;

the second correspondence includes one or more of:

Optionally, the first terminal device further includes a processing module, where the processing module is configured to determine, by using a second adaptation layer entity of the first terminal device, an identifier of the second terminal device according to third indication information and a third correspondence;

the third correspondence may include one or more of:

Optionally, the first indication information includes an identifier of the radio bearer, and when the second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the first indication information, the transceiver module is configured to submit, through the second adaptation layer entity of the first terminal device, the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and a first correspondence;

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

when the second adaptation layer entity of the first terminal device submits 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 relation, the transceiver module is configured to submit the second data to the first RLC bearer through the second adaptation layer entity of the first terminal device according to the identifier of the radio bearer, the identifier of the second terminal device and the first corresponding relation.

Optionally, the transceiver module is configured to receive second configuration information from the access network device; the second configuration information includes one or more of: the first corresponding relation, the second corresponding relation and the third corresponding relation;

the second configuration information is used to indicate one or more of:

the second correspondence includes one or more of:

the third correspondence may include one or more of:

A seventeenth aspect provides a communications device comprising a processor and a memory, the processor invoking a computer program stored in the memory to implement the method of any of the first, second, third, fourth, fifth, sixth, seventh or eighth aspects.

In one possible design, the communication device may be a chip or a device comprising a chip implementing the method in the first, second, third, fourth, fifth, sixth, seventh or eighth aspects.

An eighteenth aspect provides a computer readable storage medium having a computer program stored therein, which when executed, implements the method according to any of the first, second, third, fourth, fifth, sixth, seventh or eighth aspects.

A nineteenth aspect provides a computer program product comprising instructions which, when executed on a computer, cause the method of any of the first, second, third, fourth, fifth, sixth, seventh or eighth aspects to be performed.

In a twentieth aspect, a communication system is provided, the communication system comprising one or more of: the first terminal device, the second terminal device, and the access network device.

Drawings

The drawings that accompany the embodiments or the prior art description can be briefly described as follows.

Wherein:

FIG. 1 is a control plane protocol stack involved in a terminal device communicating with a terminal device;

FIG. 2 is a data plane protocol architecture of a U2N Relay;

fig. 3 is an infrastructure of a communication system according to an embodiment of the present application;

fig. 4 is a schematic diagram of a hardware structure of a communication device applicable to the embodiment of the present application;

fig. 5A is a flow chart of a data transmission method according to an embodiment of the present application;

fig. 5B is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 6A is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 6B is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 7A is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 7B is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 8A is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 8B is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 9 is a flowchart of another data transmission method according to an embodiment of the present application;

Fig. 10 is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 11 is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 12 is a flowchart of another data transmission method according to an embodiment of the present application;

fig. 13A is a schematic diagram of transmitting downlink data from an access network device to a second terminal device through a first terminal device and transmitting uplink data from the second terminal device to the access network device through the first terminal device;

fig. 13B is a schematic diagram of transmitting downlink data from an access network device to a second terminal device through a first terminal device and transmitting uplink data from the second terminal device to the access network device through the first terminal device;

fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a simplified terminal device according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a simplified access network device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Wherein the terms "system" and "network" in embodiments of the present application may be used interchangeably. Unless otherwise indicated, "/" indicates that the associated object is an "or" relationship, e.g., A/B may represent A or B; the term "and/or" in this application is merely an association relation describing an association object, and means that three kinds of relations may exist, for example, a and/or B may mean: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. Also, in the description of the present application, unless otherwise indicated, "a plurality" means two or more than two. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be one or more. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the network element from the same item or similar items having substantially the same effect. It will be appreciated by those of skill in the art that the words "first," "second," and the like do not limit the amount and order of execution, and that the words "first," "second," and the like do not necessarily differ.

Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The following detailed description is provided for further details of the objects, technical solutions and advantageous effects of the present application, and it should be understood that the following description is only a detailed description of the present application, and is not intended to limit the scope of the present application, and 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.

In the various embodiments of the application, if there is no specific description or logical conflict, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments according to their inherent logical relationships.

Some partial terms (or communication terms) referred to in this application are explained below. It will be appreciated that when the following terms (or communication terms) are referred to elsewhere in this application, they will not be explained later.

1. Side Link (SL)

SL refers to: defined for direct communication between the terminal device and the terminal device. I.e. the link between the terminal device and the terminal device which communicates directly without forwarding through the base station.

The interface between the terminal equipment and the terminal equipment is called as a PC5 interface, and the PC5 interface is similar to a Uu interface between the terminal equipment and the access network equipment. It will be appreciated that the control plane protocol stack involved in the communication between the terminal device and the terminal device may refer to fig. 1, and as shown in fig. 1, there may be a peer radio resource control (radio resource control, RRC) layer, a packet data convergence protocol (packet data convergence protocol, PDCP) layer, a radio link control (radio link control, RLC) layer, a medium access control (media access control, MAC) layer, a Physical (PHY) layer, etc. between the control plane and the terminal device a and the terminal device B.

In addition, the communication types supported on the SL may include broadcast communication, multicast communication, and unicast communication. In long term evolution (long term evolution, LTE) systems, broadcast communications are supported over SL. In a new air interface (NR) system, broadcast communication, multicast communication, and unicast communication are supported on SL.

The broadcast communication is similar to the access network device broadcasting system information, i.e. the terminal device does not encrypt to send the broadcast service data, and any other terminal device within the effective receiving range can receive the broadcast service data if interested in the broadcast service.

Multicast communication refers to communication among all terminals in a communication group, and any terminal device in the group can send and receive data of the multicast service.

Unicast communication is similar to data communication performed after a radio resource control (radio resource control, RRC) connection is established between a terminal device and an access network device, requiring prior establishment of a unicast connection between the two terminal devices. After the unicast connection is established, the two terminal devices may communicate data based on the negotiated identity, which may or may not be encrypted. In unicast communication, unicast communication can only be performed between two terminal devices that have established unicast connection, as compared with broadcast. It will be appreciated that unicast communications correspond to a pair of source Layer-2Identifier (source L2 ID) and destination Layer-2Identifier (destination L2 ID). For example, the sub-header of each SL MAC protocol data unit (protocol data unit, PDU) includes a source layer two identifier and a destination layer two identifier, so that data is transmitted to the correct receiving end.

2. Radio bearer (radio bearer, RB)

The RB is a generic term of a series of protocol entities and configurations allocated to the terminal device by the access network device, and is a service provided by the layer 2 for transmitting user data between the access network device and the terminal device, including a series of resource configurations such as PDCP layer entities. RBs can be divided into data radio bearers (data radio bearer, DRBs) for carrying data and signaling radio bearers (signallingradio bearer, SRBs) for carrying signaling messages. In the SL communication scenario, then RBs are referred to as side-uplink radio bearers (sidelink Radio Bearer, SLRBs), which can be divided into side-uplink data radio bearers (sidelink data radio bearer, SL DRBs) and side-uplink signaling radio bearers (sidelinksignallingradio bearer, SL SRBs).

RLC Bearer (RLC bear)

RLC bearers refer to protocol entities and configurations below the RLC layer, which are lower layer parts of the radio bearer, including RLC layer entities and a series of resources such as logical channels.

In the present application, RLC bearers may be classified into RLC bearers used when a terminal device communicates with an access network device and RLC bearers used when a terminal device communicates with a terminal device. It will be appreciated that the RLC bearer used by the terminal device in communication with the access network device may be referred to as a Uu RLC bearer, and the RLC bearer used by the terminal device in communication with the terminal device may be referred to as a PC5RLC bearer. In other words, the Uu RLC bearer is an RLC bearer on a Uu link (uulink) or Uu interface, and the PC5RLC bearer is an RLC bearer on a SL or PC5 interface. Uu link is the link between the terminal equipment and the access network equipment. It will be appreciated that Uu RLC bearers, PC5RLC bearers are names, which are used as descriptive examples in this application and are not limiting.

Protocol stack in a UE-to-Network Relay (U2N Relay) system

U2N Relay is a technology in which one terminal device communicates with an access network device through another terminal device, and U2N Relay may also be referred to as a Relay (Relay) technology.

The protocol architecture of the U2N Relay may be referred to fig. 2, and as shown in fig. 2, the protocol stack of the U2N Relay is divided into two types, one is L3 Relay (L3 Relay) and the other is L2 Relay (L2 Relay). This application describes only L2 relaying. The data packet of the Remote terminal equipment (Remote UE) is relayed below the RLC layer of the Relay terminal equipment (Relay UE), i.e. the Relay terminal equipment only maintains the relayed RLC bearer. Thus, there is an end-to-end PDCP layer, a service data adaptation protocol (service data adaptation protocol, SDAP) layer, and an RRC layer between the remote terminal device and the access network device, but no end-to-end RLC layer, MAC layer, and PHY layer.

In addition, the protocol architecture of the U2N Relay adds an adaptation (adaptation) layer between the RLC layer and the PDCP layer. The adaptation layer may 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 will be appreciated that in the application the adaptation layer used when the terminal device communicates with the access network device may be referred to as Uu adaptation layer and the adaptation layer used when the terminal device communicates with the terminal device may be referred to as PC5 adaptation layer. In other words, the adaptation layer in the protocol stack at both ends of the PC5 interface may be referred to as a PC5 adaptation layer, i.e. the adaptation layer in the protocol stack at both ends of the SL may be referred to as a PC5 adaptation layer. The adaptation layer in the protocol stack at both ends of the Uu interface may be referred to as Uu adaptation layer.

It should be noted that the main role of the adaptation layer is multiplexing and demultiplexing of the bearers, i.e. supporting that data on different radio bearers can be multiplexed onto one RLC bearer or split data on one RLC bearer into different radio bearers. For example, taking the downlink direction as an example, the adaptation layer of the access network device may multiplex data on at least one radio bearer corresponding to each of the at least one remote terminal device to the same RLC bearer, i.e. one RLC bearer on the uulink may contain data on at least one radio bearer corresponding to each of the at least one remote terminal device. On SL of each remote terminal device, data on at least one radio bearer of that remote terminal device may be mapped on the same PC5 RLC bearer. In the uplink direction, the adaptation layer of the remote terminal device may map data on multiple radio bearers of the remote terminal device to the same PC5 RLC bearer. The adaptation layer of the relay terminal device may then multiplex data from at least one radio bearer corresponding to each of the at least one remote terminal device onto the RLC bearer of the same uulink.

5. Service data unit (service data unit, SDU), protocol data unit (protocol dataunit, PDU)

In a communication network, data units exchanged between peer protocol layer entities between different devices are PDUs. A protocol layer delivers PDUs of the protocol layer to the lower layer protocol layer through service access points (serviceaccess point, SAP) (which may also be referred to as service interfaces) provided to the protocol layer by adjacent lower layer protocol layers, and exchanges of PDUs of the protocol layer, which are SDUs of the lower layer protocol layer, are accomplished by the lower layer protocol layers.

For example, for a certain protocol layer, if the protocol layer header of the protocol layer is not included in the data received by the protocol layer, the data may be regarded as an SDU of the protocol layer. If the protocol layer header of the protocol layer is included in the data received by the protocol layer, the data may be considered as a PDU of the protocol layer. For example, for an adaptation layer, if the adaptation layer header is not included in the data received by the adaptation layer, the data packet may be considered as an SDU for the adaptation layer, and if the adaptation layer header is included in the data received by the adaptation layer, the data packet may be considered as a PDU for the adaptation layer.

It should be understood that the technical solutions of the embodiments of the present application may be applied to long term evolution (long term evolution, LTE) architecture, fifth generation mobile communication technology (5th generation mobile networks,5G), wireless local area network (wireless local area networks, WLAN) systems, and the like. The technical solution of the embodiment of the present application may also be applied to other future communication systems, such as a 6G communication system, etc., in which the functions may remain the same, but the names may change.

In addition, the technical solution of the embodiment of the application may also be applicable to fields such as device-to-device (D2D) devices, internet of vehicles (vehicle to everything, V2X) devices, unmanned driving (automated driving, ADS), assisted driving (driver assistance, ADAS), intelligent driving (intelligent driving), online driving (connected driving), intelligent online driving (intelligent network driving), car sharing (car sharing), and the like.

The following describes the infrastructure of the communication system provided in the embodiments of the present application. Referring to fig. 3, fig. 3 is an infrastructure of a communication system provided in an embodiment of the present application. As shown in fig. 3, the communication system may include a first terminal device 10, at least one second terminal device 20 (only one shown in fig. 3) in SL communication with the first terminal device 10, and an access network device 30 in communication with the first terminal device 10. Fig. 3 is only a schematic diagram, and does not constitute a limitation on the applicable scenario of the technical solution provided in the present application.

The first terminal device 10 and the second terminal device 20 are one entity for receiving signals or transmitting signals or receiving signals and transmitting signals at the user side. The first terminal device 10 and the second terminal device 20 are for providing one or more of a voice service and a data connectivity service to a user. The first terminal device 10 and the second terminal device 20 may be devices that include a radio transceiver function and may cooperate with an access network device to provide communication services for users. Specifically, the first terminal device 10 and the second terminal device 20 may refer to a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a terminal, a wireless communication device, a user agent, a user equipment, or a Road Side Unit (RSU). The first terminal device 10 and the second terminal device 20 may also be an unmanned aerial vehicle, an internet of things (internet of things, ioT) device, a Station (ST) in a WLAN, a cellular phone (cell phone), a smart phone (smart phone), a cordless phone, a wireless data card, a tablet, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA) device, a laptop computer (laptop computer), a machine type communication (machine type communication, MTC) terminal, a handheld device with wireless communication functionality, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device (also referred to as a wearable smart device), a Virtual Reality (VR) terminal, an augmented reality (augmented reality, AR) terminal, a wireless terminal in an industrial control (industrial control), a wireless terminal in a wireless medical service (wireless terminal), a smart terminal in a smart (smart) device, a smart mobile terminal in a smart network (smart mobile terminal), a smart mobile terminal in a smart phone (smart phone), a smart mobile terminal in a smart phone, etc. The first terminal device 10 and the second terminal device 20 may also be device-to-device (D2D) devices, such as electric meters, water meters, etc. 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 embodiment of the present application.

It will be appreciated that the first terminal device 10 may also be in SL communication with a terminal device other than the second terminal device 20, and that the second terminal device 20 may also be in SL communication with a terminal device other than the first terminal device 10, without limitation.

In the present application, the first terminal device 10 and the second terminal device 20 may be located within the coverage area of the same access network device; or, the first terminal device 10 and the second terminal device 20 may be located within the coverage of different access network devices; or, the first terminal device 10 is located within the coverage area of the access network device 30, and the second terminal device 20 is located outside the coverage area of the access network device 30, which is not limited herein. It will be appreciated that the first terminal device 10 is a relay terminal device and the second terminal device 20 is a remote terminal device.

The access network device 30 is an entity on the network side for sending signals, or receiving signals, or sending signals and receiving signals. The access network device 30 may be a means deployed in a radio access network (radio access network, RAN) for providing wireless communication functions for the first terminal device 10 and the second terminal device 20, e.g. may be a transmission reception point (transmission reception point, TRP), a base station, various forms of control nodes. Such as a network controller, a radio controller in a cloud radio access network (cloud radio access network, CRAN) scenario, etc. Specifically, the access network device may be a macro base station, a micro base station (also referred to as a small station), a relay station, an Access Point (AP), a radio network controller (radio network controller, RNC), a Node B (NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved nodeB, or home node B, HNB), a baseBand unit (BBU), a transmission point (transmitting and receiving point, TRP), a transmitting point (transmitting point, TP), a mobile switching center, or the like, or may be an antenna panel of the base station. The control node may connect to a plurality of base stations and configure resources for a plurality of terminals covered by the plurality of base stations. In systems employing different radio access technologies, the names of base station capable devices may vary. For example, the access network device 30 may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network side device in a network after 5G, or an access network device in a PLMN network of future evolution, or the like, and the specific name of the access network device is not limited.

It should be noted that the technical solution provided in the embodiments of the present application may be applicable to various system architectures. The network architecture and the service scenario described in the embodiments of the present application are for more clearly describing the technical solution of the embodiments of the present application, and do not constitute a limitation on the technical solution provided in the embodiments of the present application, and those skilled in the art can know that, with the evolution of the network architecture and the appearance of the new service scenario, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.

Alternatively, each device in fig. 3 (for example, the first terminal device 10, the second terminal device 20, the access network device 30, etc.) may be implemented by one device, or may be implemented by a plurality of devices together, or may be a functional module in one device, which is not specifically limited in this embodiment of the present application. It will be appreciated that the above described functionality may be either a network element in a hardware device, a software function running on dedicated hardware, or a virtualized function instantiated on a platform (e.g., a cloud platform).

For example, each of the devices in fig. 3 may be implemented by the communication apparatus 400 in fig. 4. Fig. 4 is a schematic diagram of a hardware structure of a communication device applicable to the embodiment of the present application. The communication device 400 comprises at least one processor 401, communication lines 402, a memory 403 and at least one communication interface 404.

The processor 401 may be a general purpose central processing unit (central processing unit, CPU), microprocessor, application Specific Integrated Circuit (ASIC), or one or more integrated circuits for controlling the execution of the programs of the present application.

Communication line 402 may include a pathway to transfer information between the aforementioned components.

The communication interface 404 is any transceiver-like device (e.g., antenna, etc.) for communicating with other devices or communication networks, such as ethernet, RAN, wireless local area network (wireless local area networks, WLAN), etc.

The memory 403 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory, EEPROM), a compact disc read-only memory (compact disc read-only memory) or other optical disc storage, a compact disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), a magnetic disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via communication line 402. The memory may also be integrated with the processor. The memory provided by embodiments of the present application may generally have non-volatility.

The memory 403 is used for storing computer-executable instructions for executing the embodiments of the present application, and is controlled by the processor 401 to execute the instructions. The processor 401 is configured to execute computer-executable instructions stored in the memory 403, thereby implementing the methods provided in the embodiments described below.

Alternatively, the computer-executable instructions in the embodiments of the present application may be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

In one possible implementation, processor 401 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 4.

In one possible implementation, communication device 400 may include multiple processors, such as processor 401 and processor 407 in fig. 4. Each of these processors may be a single-core (single-CPU) processor or may be a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).

In one possible implementation, the communication apparatus 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 (liquid crystal display, LCD), a light emitting diode (light emitting diode, LED) display device, a Cathode Ray Tube (CRT) display device, or a projector (projector), or the like. The input device 406 is in communication with the processor 401 and may receive user input in a variety of ways. For example, the input device 406 may be a mouse, keyboard, touch screen device, or sensing device, among others.

The communication apparatus 400 may be a general-purpose device or a special-purpose device. In a specific implementation, the communication apparatus 400 may be a desktop, a portable computer, a network server, a palm computer (personal digital assistant, PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or a device having a similar structure as in fig. 4. The embodiments of the present application are not limited to the type of communication device 400.

Embodiments of the present application are described below with reference to the accompanying drawings. Optionally, in the present application, the first terminal device uses a first RLC bearer when communicating with the access network device, where the first RLC bearer is used for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer is used for transmitting data from at least one terminal device. I.e. the first RLC bearer is the UuRLC bearer used when the first terminal equipment and the access network equipment communicate. In addition, the first RLC bearer is configured to transmit data corresponding to at least one terminal device from the access network device, and may be understood as one or more of the following: the data on the first RLC bearer is from data corresponding to at least one terminal device on the UuRLC bearer of the access network device. Similarly, the first RLC bearer is used to transmit data from at least one terminal device, and can be understood as: the data on the first RLC bearer is from data on a different PC5 RLC bearer of the at least one terminal device. Wherein the second terminal device is a terminal device of the at least one terminal device. It should be noted that when the first RLC bearer is referred to elsewhere in this application, explanation will not be made later.

Firstly, in conjunction with fig. 5A and fig. 5B, how to correctly submit 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 PC5 RLC bearers corresponding to at least one remote terminal device.

Referring to fig. 5A and fig. 5B, fig. 5A is a schematic flow chart of a data transmission method provided in an embodiment of the present application, and fig. 5B is a schematic flow chart of another data transmission method provided in an embodiment of the present application. As shown in fig. 5A and 5B, the method includes, but is not limited to, the steps of:

501. the first adaptation layer entity of the first terminal device submits the first data and the first indication information to the second adaptation layer entity of the first terminal device.

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.

Optionally, the first indication information is used for indicating a radio bearer corresponding to the second terminal device transmitting the first data. In fig. 5A and fig. 5B, the first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data, which may be understood as: the first indication information is used for indicating a radio bearer corresponding to the second terminal equipment receiving the first data.

Alternatively, the first indication information may be implemented in any manner, which is not limited herein.

Mode 1.1, the first indication information includes an identification of the radio bearer and an identification of the second terminal device. It can be appreciated that the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, so that the second adaptation layer entity of the first terminal device can correctly submit the first data to the correct RLC bearer.

Mode 1.2, the first indication information includes an identification of a radio bearer and identification information of a unicast connection on a side link, the side link being a side link between the first terminal device and the second terminal device. It can be appreciated that the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, so that the second adaptation layer entity of the first terminal device can correctly submit the first data to the correct RLC bearer.

The radio bearers in mode 1.1 and mode 1.2 may include DRBs and/or SRBs, which are not limited herein.

Optionally, in this application, the identification information of the unicast connection on the sidelink may include one or more of the following: the destination layer 2 identifier and the source layer 2 identifier are not limited herein. In addition, the identification information of the unicast connection on the side link may be replaced with: the identification information of the broadcast connection on the side link, the identification information of the multicast connection on the side link, etc., are not limited herein.

Optionally, with respect to mode 1.2, the first indication information further includes an identifier of the second terminal device, that is, in a case that the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the first adaptation layer entity of the first terminal device may further submit the identifier of the second terminal device to the second adaptation layer entity of the first terminal device.

Optionally, in fig. 5A and fig. 5B, 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 equipment is an adaptation layer entity shared by PC5RLC bearers corresponding to at least one terminal equipment. It is understood that the PC5RLC bearer corresponding to one terminal device may be at least one PC5RLC bearer.

It should be noted that, in fig. 5A and fig. 5B, 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 herein. 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, the scheme is implemented by adopting 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, the scheme is implemented by using step 502.

Optionally, the embodiment shown in fig. 5A and 5B may further include: the first adaptation layer entity of the first terminal device receives 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 located in the first RLC bearer. The fourth data comprises the first data, the identifier of the radio bearer and the identifier of the second terminal equipment, and the identifier of the radio bearer and the identifier of the second terminal equipment are contained in a packet header of the fourth data.

Optionally, in the case that 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 and is performed before step 501; in case 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 receiving fourth data from the first RLC bearer is performed before step 502. Optionally, if the first indication information includes an identifier of the radio bearer and an identifier of the second terminal device, the first adaptation layer entity of the first terminal device may be implemented in any manner as follows, where no limitation is made to the first adaptation layer entity of the first terminal device to submit the first data and the first indication information to the second adaptation layer entity of the first terminal device.

Mode 2.1, the first adaptation layer entity of the first terminal device submits 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 that the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

Mode 2.2, the identification of the radio bearer and the identification of the second terminal device are not included in the header of the first data, i.e. the first data is an SDU. Namely, the first adaptation layer entity of the first terminal equipment removes the packet header of the fourth data and additionally indicates the identifier of the radio bearer and the identifier of the second terminal equipment, and it is understood that the first terminal equipment can correlate the identifier of the radio bearer with the identifier of the second terminal equipment and the first data through internal implementation, so that the cost can be reduced and the downlink data submitting efficiency can be improved.

Mode 2.3, generating fifth data by the first adaptation layer entity of the first terminal device, where the fifth data includes the first data and an identifier of the radio bearer; the first adaptation layer entity of the first terminal device submits the fifth data and the identification of the second terminal device to the second adaptation layer entity of the first terminal device, and the identification of the second terminal device is submitted to the second adaptation layer entity through an additional indication. It will be appreciated that the first terminal device may be implemented internally, associating the identity of the second terminal device with the first data. The fifth data is a PDU, the first data is an SDU, and the identifier of the radio bearer is included in the packet header of the fifth data. Namely, the first adaptation layer entity of the first terminal equipment reconstructs the fifth data, and because the identifier of the radio bearer is contained in the packet header of the fifth data, and the identifier of the second terminal equipment is not contained in the packet header of the fifth data, the overhead of the packet header is saved, and the downlink data delivery efficiency is improved.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of the unicast connection on the side link, the first adaptation layer entity of the first terminal device submits the first data and the first indication information to the second adaptation layer entity of the first terminal device, which may be implemented in any manner, without limitation herein.

Mode 3.1, the identification of the radio bearer and the identification information of the unicast connection on the sidelink are not included in the header of the first data, i.e. the first data is an SDU. Namely, the first adaptation layer entity of the first terminal equipment removes the packet header of the fourth data and additionally indicates the identifier of the radio bearer and the identifier information of the unicast connection on the side link, and it is understood that the first terminal equipment can correlate the identifier 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 downlink data submitting efficiency can be improved.

Mode 3.2, generating fifth data by the first adaptation layer entity of the first terminal device, where the fifth data includes the first data and an identifier of the radio bearer; the first adaptation layer entity of the first terminal device submits 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, the identifier of the radio 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 identifier of the radio bearer is included in the packet header of the fifth data, and the identifier 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, the overhead of the packet header is saved, and the downlink data delivery efficiency is improved. It should be appreciated that the first terminal device may associate the identification information of the unicast connection on the sidelink with the first data via an internal implementation.

Optionally, for mode 3.1, if the first indication information further includes an identifier of the second terminal device, the identifier of the second terminal device may not be included in the packet header of the first data; for mode 3.2, if the first indication information further includes the identifier of the second terminal device, 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 herein.

Optionally, with respect to modes 3.1 and 3.2, since the fourth data received by the first adaptation layer entity of the first terminal device from the first RLC bearer includes the identifier of the radio bearer and the identifier of the second terminal device, the first adaptation layer entity of the first terminal device may determine the identifier information of the unicast connection on the side link 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 side link according to the identification of the second terminal device and the second corresponding relationship, so that the conversion between the identification of the second terminal device and the identification information of the unicast connection on the side link is realized.

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

502. The second adaptation layer entity of the first terminal device submits the first data to a second RLC bearer according to the first indication information, the second RLC bearer being an RLC bearer used when the first terminal device communicates with the second terminal device.

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

The second RLC bearer is an RLC bearer used when the first terminal device communicates with the second terminal device, and may be understood as: the second RLC bearer is a PC5 RLC bearer of the first terminal apparatus used when the first terminal apparatus communicates with the second terminal apparatus.

It should be noted that, in this application, RLC bearers may be replaced by RLC layer entities. For example, the first RLC bearer may be replaced with an RLC layer entity and the second RLC bearer may be replaced with an RLC layer entity, without limitation.

Optionally, step 502 may include: the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the second adaptation layer entity of the first terminal equipment can correctly submit the data, and the reliability of downlink data transmission is improved.

The first correspondence relationship includes a correspondence relationship among an identifier of a radio bearer, an identifier of a second terminal device, and an identifier of a second RLC bearer.

Optionally, if the first indication information includes an identifier of the radio bearer and an identifier of the second terminal device, that is, if the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device may submit the first data to the second RLC bearer in the manner 4.1. If the first indication information includes an identifier of the radio bearer and identifier information of the unicast connection on the side link, that is, if the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device may submit the first data to the second RLC bearer in a manner of 4.2 or 4.3. If the first indication information includes an identifier of the radio bearer, an identifier of the second terminal device, and identifier information of the unicast connection on the side link, that is, if the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer, the identifier of the second terminal device, and the identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the side link corresponds to at least one RLC bearer, and the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer may be implemented in a manner of 4.3.

The embodiments shown in mode 4.1, fig. 5A and fig. 5B further include: the second adaptation layer entity of the first terminal equipment determines a side uplink according to the identification of the second terminal equipment and the second corresponding relation; the side link is a side link between the first terminal equipment and the second terminal equipment, and at least one RLC bearer corresponds to the side link; the second correspondence includes a correspondence between identification information of unicast connection on the side link and an identification 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 correspondence, including: and the second adaptation layer entity of the first terminal equipment submits the first data to a second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation. It can be appreciated that, in the case that the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device needs to determine the side uplink according to the identifier of the second terminal device and the second correspondence, so that data can be submitted to the corresponding side uplink; further, the first data can be submitted to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly submit the data, thereby improving reliability of downlink data transmission.

Mode 4.2, the second adaptation layer entity of the first terminal device delivering the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including: and the second adaptation layer entity of the first terminal equipment submits the first data to a second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation. It may be appreciated that in case the first adaptation layer entity of the first terminal device submits the identity of the radio bearer and the identity 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 may submit the data to the corresponding side link; further, the first data is submitted to the second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, so that the second adaptation layer entity of the first terminal device can correctly submit the data, and reliability of downlink data transmission is improved. The identification of the second terminal device may be implemented in the first terminal device, and determined according to the identification information of the unicast connection on the side link. In another possible implementation, the first adaptation layer entity of the first terminal device may also submit the identification of the second terminal device to the second adaptation layer entity of the first terminal device.

Mode 4.3, 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, including: and the second adaptation layer entity of the first terminal equipment submits 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 side link and the third corresponding relation. It may be appreciated that in case the first adaptation layer entity of the first terminal device submits the identity of the radio bearer and the identity 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 may submit the data to the corresponding side link; further, the first data is submitted to the second RLC bearer according to the identifier of the radio bearer, the identifier 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 submit the data, and reliability of downlink data transmission is improved.

The third correspondence includes correspondence among an identifier of the radio bearer, identifier information of the unicast connection on the side link, and an identifier of the second RLC bearer.

Optionally, the second adaptation layer entity of the first terminal device in mode 4.3 submits 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 side link, and the third correspondence, which may be understood as: and the second adaptation layer entity of the first terminal equipment submits the first data to a second RLC bearer in at least one RLC bearer according to the identifier of the radio bearer, the identifier information of the unicast connection on the side link and the third corresponding relation.

In the embodiment shown in fig. 5A and fig. 5B, 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.

Optionally, for mode 4.1 or mode 4.2, the embodiment shown in fig. 5A and fig. 5B may further include: generating second data by a second adaptation layer entity of the first terminal equipment; the second data includes first data and second indication information; the second indication information comprises an identifier of the radio bearer, or the second indication information comprises an identifier of the radio bearer and an identifier of the second terminal equipment; the second adaptation layer entity of the first terminal device submits first data to a second RLC bearer of the at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including: the second adaptation layer entity of the first terminal equipment submits second data to a second RLC bearer in at least one RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the second adaptation layer entity of the first terminal equipment can correctly submit the data, and the reliability of downlink data transmission is improved.

Wherein the second data is a PDU, and the second indication information is contained in a header of the second data. It can be appreciated that for mode 2.1, the identity of the radio bearer and the identity of the second terminal device are contained in the header of the second data; for modes 2.2, 2.3, 3.1 and 3.2, the identity of the radio bearer is contained in the header of the second data.

Optionally, with respect to mode 4.3, the embodiment shown in fig. 5A and 5B may further include: generating third data by a second adaptation layer entity of the first terminal equipment; the third data includes first data and second indication information; the second indication information includes an identification of the radio 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 information of the unicast connection on the side link, and the third correspondence, including: the second adaptation layer entity of the first terminal equipment delivers the third data to the second RLC bearer according to the identification of the radio bearer, the identification information of unicast connection on the side link and the third corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately deliver the data, and the reliability of downlink data transmission is improved.

Wherein the third data is a PDU, and the identifier of the radio bearer is included in a packet header of the third data.

The second adaptation layer entity of the first terminal device submits third data to the second RLC bearer according to the identifier of the radio bearer, the identifier information of the unicast connection on the side link, and the third correspondence, which may be understood as: and the second adaptation layer entity of the first terminal equipment submits third data to a second RLC bearer in the at least one RLC bearer according to the identifier of the radio bearer, the identifier information of the unicast connection on the side link and the third corresponding relation.

Optionally, the embodiment shown in fig. 5A and 5B may further include: the first terminal equipment receives the first configuration information from the access network equipment, and correspondingly, the access network equipment sends the first configuration information to the first terminal equipment. Wherein the first configuration information includes one or more of: the first corresponding relation, the second corresponding relation and the third corresponding relation, and the first configuration information is used for indicating one or more of the following: the first corresponding relation is configuration information of a second adaptation layer of the first terminal equipment; the second corresponding relation is configuration information of a first adaptation layer of the first terminal equipment and/or a second adaptation layer of the first terminal equipment; the third corresponding relation is configuration information of the second adaptation layer of the first terminal device.

The first configuration information may be included in RRC signaling or other signaling, which is not limited herein. It will be appreciated that the first configuration information may be sent by the access network device to the first terminal device when the access network device receives the 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 autonomously, without limitation. The configuration information request message may be used to instruct the access network device to send the first configuration information.

When the embodiments shown in fig. 5A and fig. 5B are implemented in any of the modes 2.1 to 2.3 and in the mode 4.1, the first correspondence is configuration information of the PC5 adaptation layer of the first terminal device; the second corresponding relation is configuration information of a PC5 adaptation layer of the first terminal equipment, namely the first configuration information comprises a first corresponding relation and a second corresponding relation, and the first configuration information is used for indicating one or more of the following: the first corresponding relation is configuration information of a PC5 adaptation layer of the first terminal equipment; the second correspondence is configuration information of the PC5 adaptation layer of the first terminal device. When the embodiments shown in fig. 5A and fig. 5B are implemented in any of the modes 3.1-3.2 and mode 4.2, the first correspondence is configuration information of the PC5 adaptation layer of the first terminal device; the second corresponding relation is configuration information of a Uu adaptation layer of the first terminal equipment and/or a PC5 adaptation layer of the first terminal equipment, namely the first configuration information comprises a first corresponding relation and a second corresponding relation, and the first configuration information is used for indicating one or more of the following: the first corresponding relation is configuration information of a PC5 adaptation layer of the first terminal equipment; the second corresponding relation is configuration information of the Uu adaptation layer of the first terminal equipment and the PC5 adaptation layer of the first terminal equipment. When the embodiments shown in fig. 5A and fig. 5B are implemented in any of the modes 3.1-3.2 and mode 4.3, the second correspondence is configuration information of the Uu adaptation layer of the first terminal device; the third correspondence is configuration information of the PC5 adaptation layer of the first terminal device.

Alternatively, 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 contained in the same cell or different cells, which is not limited herein.

Alternatively, 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 cell, 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 first cell. The first cell may be a predefined cell, or a fixed cell, without limitation. For example, the first cell may be an Adapt-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation.

Alternatively, the first cell may comprise a first sub-cell when implementing the embodiments shown in fig. 5A and 5B in any of ways 2.1-2.3 and 4.1. In implementing the embodiments of fig. 5A and 5B in any of ways 3.1-3.2 and 4.2, the first cell may include a first sub-cell, and optionally, the first cell may further include a second sub-cell. Wherein the first sub-cell may comprise one or more of: the identifier of the radio bearer, the identifier of the second terminal device, the identifier of the second RLC bearer, and the first sub-cell are used to indicate the first correspondence. The first sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the first sub-cell may be a MappingInfo cell in a beer-MappingInfo list cell, or a cell of similar definition or function, or a cell of an extension field, without limitation. The second sub-cell may include one or more of the following: the identification information of unicast connection on the side link and the identification of the terminal equipment, and the second sub-cell is used for indicating the second corresponding relation. The second sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the second sub-cell may be a DST-mappingInfo cell in a DST-mappingInfo list cell, or a cell of similar definition or function, or a cell of an extension field, without limitation.

Optionally, in case that 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 cell, the first sub-cell may further include an identifier of the first RLC bearer, where the first sub-cell is further configured to indicate a correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

Illustratively, in the case where the first cell includes a first sub-cell and a second sub-cell, the first cell may be:

the Bearer-mappingInfoList cell may include a first corresponding relationship, and the access network device may configure a maxNrofRemoteUEs group corresponding relationship at most, where maxNrofbeers is the number of bearers corresponding to the terminal device that may be relayed at most by the first terminal device. The DST-mappinglnfolist cell may include a second correspondence, and the access network device may configure a maxnrofremotes group correspondence at most, where maxnrofremotes is the number of terminal devices connectable to the first terminal device. It can be understood that the DRB-ID is an identifier of the radio bearer, the Remote-UE-ID is an identifier of the second terminal device, the PC5-RLC-bearer-ID is an identifier of the second RLC bearer, the Uu-RLC-bearer-ID is an identifier of the first RLC bearer, and the DestinationIndex is identification information of the unicast connection on the side link.

Alternatively, the first cell may include the second sub-cell and the third sub-cell when implementing the embodiments of fig. 5A and 5B in any of manners 3.1-3.2 and 4.3. Wherein the third sub-cell may comprise one or more of: the identifier of the radio bearer, the identifier information of the unicast connection on the side link, the identifier of the second RLC bearer, and the third sub-cell is configured to indicate a third correspondence. The third sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the third sub-cell may be a MappingInfo cell in a beer-MappingInfo list cell, or a cell of similar definition or function, or a cell of an extension field, without limitation. Optionally, in 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 are contained in different cells, the configuration information of the Uu adaptation layer of the first terminal device is contained in the second cell and the configuration information of the PC5 adaptation layer of the first terminal device is contained in the third cell. The second cell may be a predefined cell, or a fixed cell, without limitation. For example, the second cell may be a Uu-Adapt-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation. The third cell may be a predefined cell, or a fixed cell, without limitation. For example, the third cell may be a PC 5-adapter-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation.

Alternatively, the third cell includes the first sub-cell and the second sub-cell when implementing the embodiments of fig. 5A and 5B in any of manners 2.1-2.3 and 4.1.

Alternatively, when implementing the embodiments shown in fig. 5A and 5B in any of modes 3.1-3.2 and mode 4.2, the second cell may include the second sub-cell and the third cell may include the first sub-cell. Optionally, the third cell may further comprise a second sub-cell.

Alternatively, when implementing the embodiments shown in fig. 5A and 5B in any of modes 3.1-3.2 and mode 4.3, the second cell may include a second sub-cell and the third cell may include a third sub-cell.

Illustratively, the second cell may be:

for example, when the third cell includes the first sub-cell and the second sub-cell, the third cell may be:

In the following, with reference to fig. 6A and fig. 6B, it is explained how to correctly submit uplink data when the PC5 adaptation layer entity of the first terminal device configures only one PC5 adaptation layer entity and the PC5 RLC corresponding to at least one remote terminal device carries a common adaptation layer entity.

Referring to fig. 6A and fig. 6B, fig. 6A is a schematic flow chart of another data transmission method provided in the embodiment of the present application, and fig. 6B is a schematic flow chart of another data transmission method provided in the embodiment of the present application. As shown in fig. 6A and 6B, the method includes, but is not limited to, the steps of:

601. the first adaptation layer entity of the first terminal device submits the first data and the first indication information to the second adaptation layer entity of the first terminal device.

Optionally, the first indication information is used for indicating a radio bearer corresponding to the second terminal device transmitting the first data. In fig. 6A and 6B, the first indication information is used to indicate the radio bearer corresponding to the second terminal device transmitting the first data, which may be understood as: the first indication information is used for indicating a radio bearer corresponding to the second terminal equipment for sending the first data.

For the identification information of the unicast connection on the side link in the mode 1.2, reference may be made to the description related to fig. 5A and fig. 5B, which are not repeated herein.

Optionally, in fig. 6A and fig. 6B, 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 equipment is an adaptation layer entity shared by PC5RLC bearers corresponding to at least one terminal equipment. It is understood that the PC5RLC bearer corresponding to one terminal device may be at least one PC5RLC bearer.

It should be noted that, in fig. 6A and fig. 6B, 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 herein. 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, the scheme is implemented by adopting 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, the scheme is implemented by adopting step 602.

Optionally, the embodiment shown in fig. 6A and 6B may further include: the first adaptation layer entity of the first terminal device receives third data from the second RLC bearer; the third data comprises an identifier of the radio bearer and the first data, namely the identifier of the radio bearer is contained in a 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, a first adaptation layer entity RLC layer entity of the first terminal device receives the third data, the RLC layer entity being located 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 may be appreciated that in case 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 receiving the third data from the second RLC bearer is performed before step 601; in case 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 receiving the third data from the second RLC bearer is performed before step 602.

Optionally, if the first indication information includes an identifier of the radio bearer and an identifier of the second terminal device, the first adaptation layer entity of the first terminal device may be implemented in any manner as follows, where no limitation is made to the first adaptation layer entity of the first terminal device to submit the first data and the first indication information to the second adaptation layer entity of the first terminal device.

Mode 2.1, generating fourth data by the first adaptation layer entity of the first terminal device, where the third data includes the identifier of the radio bearer and the first 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, 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, that is, the first adaptation layer entity of the first terminal device reconstructs the third data.

Mode 2.2, in the case where the third data includes the identifier of the radio bearer and the first data, the identifier of the radio bearer and the identifier of the second terminal device are not included in the header of the first data, and the first data is an SDU. Namely, the first adaptation layer entity of the first terminal equipment removes the packet header of the third data and additionally indicates the identifier of the radio bearer and the identifier of the second terminal equipment, so that the overhead can be reduced, and the uplink data delivery efficiency is improved.

Mode 2.3, the first adaptation layer entity of the first terminal device handing over the third data and the identification of the second terminal device to the second adaptation layer entity of the first terminal device, in case the third data comprises the identification of the radio bearer and the first data. The third data is a PDU, and the first data is an SDU, that is, the third data is not processed by the first adaptation layer entity of the first terminal device, so that the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

Mode 2.4, the first adaptation layer entity of the first terminal device handing over the third data to the second adaptation layer entity of the first terminal device, in case the third data comprises an identification of the radio bearer, an identification of the second terminal device and the first data. The third data is a PDU, and the first data is an SDU, that is, the third data is not processed by the first adaptation layer entity of the first terminal device, so that the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

In the mode 3.1, when the third data includes the identifier of the radio bearer and the first data, the identifier of the radio bearer and the identifier information of the unicast connection on the side link are not included in the packet header of the first data, where 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 information of the unicast connection on the side link, so that overhead can be reduced and uplink data delivery efficiency is improved.

Mode 3.2, in case the third data comprises an identification of the radio bearer and the first data, the first adaptation layer entity of the first terminal device submits the third data and identification information of the unicast connection on the side link 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 process the third data, and additionally indicates the identifier of the radio bearer and the identifier information of the unicast connection on the sidelink, so that the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

Optionally, for modes 2.1-2.3, the first adaptation layer entity of the first terminal device needs to determine the identity of the second terminal device. Specifically, the first adaptation layer entity of the first terminal device determines the identifier of the second terminal device according to the identifier information of the unicast connection on the side link and the first corresponding relationship, so that the conversion between the identifier information of the unicast connection on the side link and the identifier of the second terminal device is realized. The side link is a side link transmitting first data. Wherein the side link is a side link transmitting the first data. The first correspondence comprises a correspondence between identification information of the unicast connection on the side link and an identification of the second terminal device.

602. The second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the first indication information.

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

Optionally, step 602 may include: the second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can correctly submit the data, and the reliability of uplink data transmission is improved.

The second correspondence includes correspondence among an identifier of the radio bearer, an identifier of the second terminal device, and an identifier of the first RLC bearer.

Optionally, if the first indication information includes an identifier of the radio bearer and identifier information of the unicast connection on the side link, that is, if the first adaptation layer entity of the first terminal device submits the identifier of the radio bearer and identifier information of the unicast connection on the side link to the second adaptation layer entity of the first terminal device, the embodiment shown in fig. 6A and fig. 6B further includes: the second adaptation layer entity of the first terminal equipment determines the identification of the second terminal equipment according to the identification information of the unicast connection on the side link and the first corresponding relation, so that the conversion between the identification information of the unicast connection on the side link and the identification of the second terminal equipment is realized. It may be appreciated that the second adaptation layer entity of the first terminal device may execute before the second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence according to the identifier of the unicast connection on the side link and the first correspondence.

Optionally, the embodiment shown in fig. 6A and 6B may further include: generating second data by a second adaptation layer entity of the first terminal equipment; the second data includes first data and second indication information; the second indication information comprises an identifier of the radio bearer and an identifier of the second terminal equipment; the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including: the second adaptation layer entity of the first terminal equipment submits second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can correctly submit the data, and the reliability of uplink data transmission is improved. Wherein the second data is a PDU, and the second indication information is contained in a header of the second data.

Optionally, the embodiment shown in fig. 6A and 6B may further include: the first terminal equipment receives the first configuration information from the access network equipment, and correspondingly, the access network equipment sends the first configuration information to the first terminal equipment. Wherein the first configuration information includes one or more of: the first corresponding relation and the second corresponding relation; the first configuration information is used to indicate one or more of: the first corresponding relation is configuration information of a first adaptation layer of the first terminal equipment and/or a second adaptation layer of the first terminal equipment; the second corresponding relation is configuration information of a second adaptation layer of the first terminal equipment.

When the embodiments shown in fig. 6A and fig. 6B are implemented in the modes 2.1 and 2.3, the first correspondence is configuration information of the PC5 adaptation layer of the first terminal device; the second corresponding relation is configuration information of a Uu adaptation layer of the first terminal equipment, namely the first configuration information comprises a first corresponding relation and a second corresponding relation, and the first configuration information is used for indicating one or more of the following items: the first corresponding relation is configuration information of a PC5 adaptation layer of the first terminal equipment; the second corresponding relation is the configuration information of the Uu adaptation layer of the first terminal equipment; when the embodiment shown in fig. 6A and fig. 6B is implemented in any manner in manner 2.4, the second corresponding relationship is configuration information of the Uu adaptation layer of the first terminal device, that is, the first configuration information includes the second corresponding relationship, and the first configuration information is used to indicate that the second corresponding relationship is the configuration information of the Uu adaptation layer of the first terminal device; when the embodiments shown in fig. 6A and fig. 6B are implemented in any of the modes 3.1 to 3.2, the first corresponding relationship is configuration information of a Uu adaptation layer of the first terminal device; the second corresponding relation is configuration information of a Uu adaptation layer of the first terminal equipment, namely the first configuration information comprises a first corresponding relation and a second corresponding relation, and the first configuration information is used for indicating one or more of the following items: the first corresponding relation is the configuration information of the Uu adaptation layer of the first terminal equipment; the second corresponding relation is configuration information of the Uu adaptation layer of the first terminal equipment.

Alternatively, 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 contained in the same cell or different cells, which is not limited herein.

Alternatively, in the case where 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 cell, 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 first cell. The first cell may be a predefined cell, or a fixed cell, without limitation. For example, the first cell may be an Adapt-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation.

Alternatively, the first cell may include a first sub-cell and a second sub-cell when implementing the embodiments shown in fig. 6A and 6B in modes 2.1 and 2.3. Wherein the first sub-cell may comprise one or more of: the identification information of unicast connection on the side link and the identification of the terminal equipment, and the first sub-cell is used for indicating the first corresponding relation. The first sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the first sub-cell may be a DST-mappingInfo cell in a DST-mappingInfo list, or a cell of similar definition or function, or a cell of an extension field, without limitation. The second sub-cell may include one or more of the following: the identifier of the radio bearer, the identifier of the second terminal device, the identifier of the first RLC bearer, and the second sub-cell are used to indicate the second correspondence. The second sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the second sub-cell may be a MappingInfo cell in a beer-MappingInfo list, or a cell of similar definition or function, or a cell of an extension field, without limitation.

Alternatively, the first cell may comprise the second sub-cell when the embodiments shown in fig. 6A and 6B are implemented in any of ways 2.4.

Alternatively, the first cell may comprise a first sub-cell and a second sub-cell when the embodiments shown in fig. 6A and 6B are implemented in any of ways 3.1-3.2.

Optionally, in case that 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 cell, the second sub-cell may further include an identifier of the second RLC bearer, where the second sub-cell is further configured to indicate a correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

Optionally, in case 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 cells, the configuration information of the Uu adaptation layer of the first terminal device is contained in the second cell and the configuration information of the PC5 adaptation layer of the first terminal device is contained in the third cell. The second cell may be a predefined cell, or a fixed cell, without limitation. For example, the second cell may be a Uu-Adapt-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation. The third cell may be a predefined cell, or a fixed cell, without limitation. For example, the third cell may be a PC 5-adapter-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation.

Alternatively, in implementing the embodiments shown in fig. 6A and 6B in modes 2.1 and 2.3, the second cell may include the second sub-cell, and the third cell may include the first sub-cell.

Alternatively, the second cell may comprise the first sub-cell when the embodiments shown in fig. 6A and 6B are implemented in any of ways 2.4.

Alternatively, the second cell may comprise a first sub-cell and a second sub-cell when the embodiments shown in fig. 6A and 6B are implemented in any of ways 3.1-3.2.

In this application, when the embodiment shown in fig. 5A and fig. 5B is adopted as the scheme for downlink data transmission and the embodiment shown in fig. 6A and fig. 6B is adopted as the scheme for uplink data transmission, the configuration information received by the first terminal device from the access network device includes the first configuration information related to the embodiment shown in fig. 5A and fig. 5B and the first configuration information related to the embodiment shown in fig. 6A and fig. 6B, that is, the access network device may simultaneously send the configuration information related to the downlink data transmission and the configuration information related to the uplink data transmission to the first terminal device. It will be appreciated 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 may be contained in the same cell or in different cells, without limitation. 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 cell, 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 according to the embodiment shown in fig. 5A and fig. 5B are both included in the same cell, and 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 according to the embodiment shown in fig. 6A and fig. 6B are both included in the same cell. 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 cells, the configuration information of the Uu adaptation layer of the first terminal device according to the embodiment shown in fig. 5A and 5B, and the configuration information of the Uu adaptation layer of the first terminal device according to the embodiment shown in fig. 6A and 6B are both included in the same cell; the configuration information of the PC5 adaptation layer of the first terminal device according to the embodiment shown in fig. 5A and 5B and the configuration information of the PC5 adaptation layer of the first terminal device according to the embodiment shown in fig. 6A and 6B are both contained in the same cell.

In the following, with reference to fig. 7A and fig. 7B, it is explained how to correctly submit downlink data when a plurality of PC5 adaptation layer entities are configured in the first terminal device, and one of the plurality of PC5 adaptation layer entities is an adaptation layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

Referring to fig. 7A and fig. 7B, fig. 7A is a schematic flow chart of another data transmission method provided in the embodiment of the present application, and fig. 7B is a schematic flow chart of another data transmission method provided in the embodiment of the present application. As shown in fig. 7A and 7B, the method includes, but is not limited to, the steps of:

701. the first adaptation layer entity of the first terminal device submits 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.

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.

Optionally, the first indication information is used for indicating the second terminal device transmitting the first data, and the first indication information is an identifier of the second terminal device.

Optionally, the second indication information is used for indicating the radio bearer, and the second indication information includes an identification of the radio bearer. The radio bearer may include a DRB and/or an SRB, among other things, without limitation.

Optionally, in fig. 7A and fig. 7B, 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 equipment is an adaptation layer entity used by the PC5 RLC bearer corresponding to one terminal equipment. It is understood that the PC5 RLC bearer corresponding to one terminal device may be at least one PC5 RLC bearer.

It should be noted that, in fig. 7A and fig. 7B, 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 herein. 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, the scheme is implemented by adopting 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, the scheme is implemented by using step 702.

Optionally, step 701 may include: the first adaptation layer entity of the first terminal equipment determines a second adaptation layer entity of the first terminal equipment from a plurality of adaptation layer entities according to the identification of the second terminal equipment and the first corresponding relation; the first adaptation layer entity of the first terminal equipment submits the first data and the second indication information to the second adaptation layer entity of the first terminal equipment, so that the first adaptation layer entity of the first terminal equipment can accurately submit the downlink data.

The plurality of adaptation layer entities may be adaptation layer entities used by the PC5 RLC bearer corresponding to each of the plurality of terminal devices, that is, one PC5 adaptation layer entity used by the PC5 RLC bearer corresponding to each of the plurality of terminal devices.

Optionally, the first correspondence includes one or more of:

the corresponding relation between the identification of the second terminal equipment and the identification information of unicast connection on the side uplink, wherein the side uplink is the side uplink between the first terminal equipment and the second terminal equipment; the second adaptation layer entity of the first terminal device corresponds to the side uplink, or the second adaptation layer entity of the first terminal device corresponds to the second terminal device.

The identification information of the unicast connection on the side link may refer to the description related to fig. 5A and fig. 5B, which are not described herein.

Optionally, the embodiment shown in fig. 7A and 7B may further include: the first adaptation layer entity of the first terminal device receives third data from the first RLC bearer, the third data comprising the first data, an identity of the radio bearer, and an identity of the second terminal device, the identity of the radio bearer and the identity of the second terminal device being included in a header of the third data. For example, the first adaptation layer entity of the first terminal device receives the third data from an RLC layer entity included in the first RLC bearer. Wherein, in case 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 and is performed before step 701; in case 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 receiving the third data from the first RLC bearer is performed before step 702.

Alternatively, the first adaptation layer entity of the first terminal device submits the first data and the second indication information to the second adaptation layer entity of the first terminal device, which may be implemented in any manner, which is not limited herein.

Mode 1.1, generating fourth data by a first adaptation layer entity of a first terminal device, wherein the fourth data comprises first data and an identifier of a radio bearer; the first adaptation layer entity of the first terminal device delivers the fourth data to the second adaptation layer entity of the first terminal device. The fourth data is PDU, the first data is SDU, the identification of the wireless load is contained in the packet header of the fourth data, namely the first adapting layer entity of the first terminal equipment reconstructs the fourth data, so that the identification of the second terminal equipment is not contained in the fourth data, the overhead of the packet header is saved, and the downlink data submitting efficiency is improved.

Mode 1.2, the first adaptation layer entity of the first terminal device submits 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 that the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

Mode 1.3, the identifier of the radio bearer is not included in the packet header of the first data, where the first data is an SDU, i.e. 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, so that the overhead can be reduced and the downlink data delivery efficiency is improved.

702. The second adaptation layer entity of the first terminal device submits the first data to a second RLC bearer according to the second indication information, the second RLC bearer being an RLC bearer used when the first terminal device communicates with the second terminal device.

Optionally, step 702 may include: the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit the downlink data, and the reliability of downlink data transmission is improved. It can be appreciated that, for modes 1.1 and 1.3, after the second adaptation layer entity of the first terminal device receives the identifier of the radio bearer from the first adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device may submit the first data to the second RLC bearer according to the identifier of the radio bearer and the second correspondence.

The second correspondence includes correspondence among an identifier of the radio bearer, an identifier of the second terminal device, and an identifier of the second RLC bearer.

Optionally, the second indication information further includes an identifier of a second terminal device, and the second indication information is further used for indicating the second terminal device that receives the first data, where the second adaptation layer entity of the first terminal device submits the first data to the second RLC bearer according to the identifier of the radio bearer and the second correspondence, and may include: the second adaptation layer entity of the first terminal equipment submits the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit the downlink data, and the reliability of the downlink data transmission is improved. It may be appreciated that, in the mode 1.2, after the second adaptation layer entity of the first terminal device receives the identifier of the radio bearer and the identifier of the second terminal device from the first adaptation layer entity of the first terminal device, the second adaptation layer entity of the first terminal device may submit the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence.

Optionally, the embodiment shown in fig. 7A and 7B may further include: generating second data by a second adaptation layer entity of the first terminal equipment; the second data comprises first data and third indication information; the third indication information comprises an identifier of the radio bearer, or the third indication information comprises an identifier of the radio bearer and an identifier of the second terminal equipment; the second adaptation layer entity of the first terminal device delivers the first data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the second correspondence, including: the second adaptation layer entity of the first terminal equipment submits second data to the second RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the second corresponding relation, so that the second adaptation layer entity of the first terminal equipment can accurately submit downlink data, and the reliability of downlink data transmission is improved. The second data is a PDU, and the third indication information is contained in a packet header of the second data.

Wherein, for modes 1.1 and 1.3, the identity of the radio bearer is contained in the header of the second data; for mode 1.2, the identity of the radio bearer and the identity of the second terminal device are included in a header of the second data.

Optionally, the embodiment shown in fig. 7A and 7B may further include: the first terminal equipment receives the first configuration information from the access network equipment, and correspondingly, the access network equipment sends the first configuration information to the first terminal equipment. Wherein the first configuration information includes one or more of: the first corresponding relation and the second corresponding relation; the first configuration information is used to indicate one or more of: the first corresponding relation is configuration information of a first adaptation layer of the first terminal equipment; the second corresponding relation is configuration information of a second adaptation layer of the first terminal equipment.

Alternatively, 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 may be contained in the same cell or different cells, i.e. 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 contained in the same cell or different cells, which is not limited herein.

Alternatively, the first cell may comprise a first sub-cell and a second sub-cell. Wherein the first sub-cell may comprise one or more of: the identification information of the unicast connection on the side link, the identification of the second terminal device, the identification of the second adaptation layer entity of the first terminal device, and the first sub-cell is used for indicating the first correspondence. The first sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the first sub-cell may be a DST-mappingInfo cell in a DST-mappingInfo list cell, or a cell of similar definition or function, or a cell of an extension field, without limitation. The second sub-cell may include one or more of the following: the identifier of the radio bearer, the identifier of the second terminal device, the identifier of the second RLC bearer, and the second sub-cell is configured to indicate a second correspondence. The second sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the second sub-cell may be a MappingInfo cell in a beer-MappingInfo list cell, or a cell of similar definition or function, or a cell of an extension field, without limitation.

Optionally, in case that 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 cell, the second sub-cell may further include an identifier of the first RLC bearer, and the second sub-cell is further configured to indicate a correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the first RLC bearer.

Wherein the first sub-cell comprises one or more of the following: in the case of the identification information of the unicast connection on the side link and the identification of the terminal device, specific examples of the first cell may refer to the first cell in fig. 5A and fig. 5B, and are not described herein. The first sub-cell includes one or more of the following: in the case of the identifier of the second adaptation layer entity of the first terminal device, the identifier of the terminal device, the first cell may be:

the Bearer-mappingInfoList cell may include a second corresponding relationship, and the access network device may configure a maxNrofRemoteUEs group corresponding relationship at most, where maxNrofbeers is the number of bearers corresponding to the terminal device that may be relayed at most by the first terminal device. The DST-mappinglnfolist cell may include a first correspondence, and the access network device may configure a maxnrofremotes group correspondence at most, where maxnrofremotes is the number of terminal devices connectable to the first terminal device. It can be understood that the DRB-ID is an identifier of the radio bearer, the Remote-UE-ID is an identifier of the second terminal device, the PC5-RLC-bearer-ID is an identifier of the second RLC bearer, the Uu-RLC-bearer-ID is an identifier of the first RLC bearer, and the PC 5-adaptation-ID is an identifier of the second adaptation layer entity of the first terminal device.

Optionally, in 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 are contained in different cells, the configuration information of the Uu adaptation layer of the first terminal device is contained in the second cell and the configuration information of the PC5 adaptation layer of the first terminal device is contained in the third cell. The second cell may be a predefined cell, or a fixed cell, without limitation. For example, the second cell may be a Uu-Adapt-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation. The third cell may be a predefined cell, or a fixed cell, without limitation. For example, the third cell may be a PC 5-adapter-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation.

Alternatively, the second cell may comprise the first sub-cell. It will be appreciated that for downlink data transmission, the access network device may configure the first correspondence in the second cell.

Alternatively, the third cell may comprise a second sub-cell. It may be appreciated that, for downlink data transmission, the access network device may configure the second correspondence in the third cell.

Illustratively, the first sub-cell includes one or more of the following: in the case of the identification information of the unicast connection on the side link, the identification of the terminal device, the second cell may be:

also exemplary, in the first sub-cell, one or more of the following are included: in the case of the identifier of the second adaptation layer entity of the first terminal device, the identifier of the terminal device, the second cell may be:

In the following, with reference to fig. 8A and 8B, it is explained how to correctly submit uplink data when a plurality of PC5 adaptation layer entities are configured in the first terminal device, and one of the plurality of PC5 adaptation layer entities is an adaptation layer entity used by a PC5 RLC bearer corresponding to a remote terminal device.

801. The first adaptation layer entity of the first terminal device submits the first data and the first indication information to the second adaptation layer entity of the first terminal device.

Optionally, the first indication information is used to indicate a radio bearer, and the radio bearer may include a DRB and/or an SRB, which is not limited herein.

Optionally, in fig. 8A and fig. 8B, 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 equipment is an adaptation layer entity used by PC5 RLC bearing corresponding to one terminal equipment. It is understood that the PC5 RLC bearer corresponding to one terminal device may be at least one PC5 RLC bearer.

It should be noted that, in fig. 8A and fig. 8B, 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 herein. 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, the scheme is implemented by adopting 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, the scheme is implemented by using step 802.

Optionally, the embodiment shown in fig. 8A and 8B may further include: the first adaptation layer entity of the first terminal device receives third data from the second RLC bearer, the third data comprising an identity of the radio bearer, i.e. the identity of the radio bearer is comprised in a header of the third data, or the third data comprising an identity of the radio bearer and an identity of the second terminal device, i.e. the identity of the radio bearer and the identity of the second terminal device is comprised in a header of the third data. For example, the first adaptation layer entity of the first terminal device receives third data from an RLC layer entity comprised by 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 may be appreciated that in case 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 receiving the third data from the second RLC bearer is performed before step 801; in case 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 receiving the third data from the second RLC bearer is performed before step 802.

Alternatively, the first adaptation layer entity of the first terminal device submits the first data and the first indication information to the second adaptation layer entity of the first terminal device, which may be implemented in any manner, which is not limited herein.

In the 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 fourth data, where 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, 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, that is, the first adaptation layer entity of the first terminal device reconstructs the third data.

Mode 1.2, the first adaptation layer entity of the first terminal device handing over the third data and the identification of the second terminal device to the second adaptation layer entity of the first terminal device, in case the third data comprises the identification of the radio bearer and the first data. The third data is a PDU, and the first data is an SDU, that is, the third data is not processed by the first adaptation layer entity of the first terminal device, so that the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

In 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 header of the first data, and the first data is an SDU. Namely, the first adaptation layer entity of the first terminal equipment removes the packet header of the third data and additionally indicates the identifier of the radio bearer and the identifier of the second terminal equipment, so that the overhead can be reduced, and the uplink data delivery efficiency is improved.

Mode 1.4, the first adaptation layer entity of the first terminal device handing over the third data to the second adaptation layer entity of the first terminal device, in case the third data comprises an identification of the radio bearer, an identification of the second terminal device and the first data. The third data is a PDU, and the first data is an SDU, that is, the third data is not processed by the first adaptation layer entity of the first terminal device, so that the first adaptation layer entity of the first terminal device is prevented from changing the structure of the packet header.

Optionally, for modes 1.2 and 1.3, the first adaptation layer entity of the first terminal device may further submit the identifier of the second terminal device to the second adaptation layer entity of the first terminal device, so that the first adaptation layer entity of the first terminal device may determine the identifier of the second terminal device according to the second indication information and the second correspondence, thereby implementing conversion between the second indication information and the identifier of the second terminal device.

Optionally, the second indication information includes one or more of: the identity of the first adaptation layer entity, the identity information of the unicast connection on the side-link, the side-link being between the first terminal device and the second terminal device.

Optionally, the second correspondence includes one or more of:

a correspondence between an identity of a first adaptation layer entity of the first terminal device and an identity of the second terminal device;

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

For the identification information of the unicast connection on the side link, reference may be made to the related descriptions in fig. 5A and fig. 5B, which are not described herein.

802. The second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the first indication information.

Optionally, step 802 may include: the second adaptation layer entity of the first terminal equipment submits the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the second adaptation layer entity of the first terminal equipment can correctly submit the data, and the reliability of uplink data transmission is improved.

The first correspondence includes correspondence among an identifier of a radio bearer, an identifier of a second terminal device, and an identifier of a first RLC bearer.

Optionally, for modes 1.2 to 1.3, in a case that 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 embodiment shown in fig. 8A and fig. 8B further includes: the second adaptation layer entity of the first terminal equipment determines the identification of the second terminal equipment according to the third indication information and the third corresponding relation, so that the conversion between the third indication information and the identification of the second terminal equipment is realized. It may be appreciated that the determining, by the second adaptation layer entity of the first terminal device, the identification of the second terminal device according to the third indication information and the third correspondence may be performed before the second adaptation layer entity of the first terminal device submits the first data to the first RLC bearer according to the identification of the radio bearer, the identification of the second terminal device, and the first correspondence.

Wherein the third indication information includes one or more of: the identification of the second adaptation layer entity, the identification information of unicast connection on the side link, wherein the side link is the side link between the first terminal equipment and the second terminal equipment, and the side link corresponds to the first adaptation layer entity.

Optionally, the third correspondence includes one or more of:

Optionally, the embodiment shown in fig. 8A and 8B further includes: generating second data by a second adaptation layer entity of the first terminal equipment; the second data comprises the first data, the identifier of the radio bearer and the identifier of the second terminal device, or the second data comprises the first data and the identifier of the radio bearer; the second adaptation layer entity of the first terminal device delivers the first data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal device, and the first correspondence, including: the second adaptation layer entity of the first terminal equipment submits second data to the first RLC bearer according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the second adaptation layer entity of the first terminal equipment can correctly submit the data, and the reliability of uplink data transmission is improved. Wherein the second data is a PDU, and for mode 1.4, the identifier of the radio bearer and the identifier of the second terminal device are included in a packet header of the second data; for modes 1.1-1.3, the identity of the radio bearer is included in a header of the second data.

Optionally, the embodiment shown in fig. 8A and 8B may further include: the first terminal equipment receives the second configuration information from the access network equipment, and correspondingly, the access network equipment sends the second configuration information to the first terminal equipment. The second configuration information includes one or more of: the first corresponding relation, the second corresponding relation and the third corresponding relation. The second configuration information is used to indicate one or more of: the first corresponding relation is configuration information of a second adaptation layer of the first terminal equipment; the second corresponding relation is the configuration information of the first adaptation layer of the first terminal equipment; the third corresponding relation is configuration information of the second adaptation layer of the first terminal device.

The second configuration information may be included in RRC signaling or other signaling, which is not limited herein. It will be appreciated that the second configuration information may be sent by the access network device to the first terminal device when the access network device receives the 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 autonomously, without limitation. The configuration information request message may be used to instruct the access network device to send the second configuration information.

Optionally, in the case that 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, 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 corresponding relation is configuration information of a second adaptation layer of the first terminal equipment; the second corresponding relation is configuration information of the first adaptation layer of the first terminal equipment. In the case that 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 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 corresponding relation is configuration information of a second adaptation layer of the first terminal equipment; the third corresponding relation is configuration information of the second adaptation layer of the first terminal device.

Alternatively, the first cell may comprise a first sub-cell and a second sub-cell in case the first adaptation layer entity of the first terminal device submits the identity of the second terminal device to the second adaptation layer entity of the first terminal device. Wherein the first sub-cell may comprise one or more of: the identifier of the radio bearer, the identifier of the second terminal device, the identifier of the first RLC bearer, and the first sub-cell is configured to indicate the first correspondence. The first sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the first sub-cell may be a MappingInfo cell in a beer-MappingInfo list cell, or a cell of similar definition or function, or a cell of an extension field, without limitation. The second sub-cell may include one or more of the following: the identifier of the first 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, and the second sub-cell is used for indicating the second correspondence. The second sub-cell may be a predefined cell, or a fixed cell, without limitation. For example, the second sub-cell may be a DST-mappingInfo cell in a DST-mappingInfo list cell, or a cell of similar definition or function, or a cell of an extension field, without limitation.

Alternatively, the first cell may comprise a first sub-cell and a third sub-cell in case the first adaptation layer entity of the first terminal device does not submit the identity of the second terminal device to the second adaptation layer entity of the first terminal device. Wherein the third sub-cell may comprise one or more of: 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, and the third sub-cell is used for indicating the third correspondence. The third sub-cell may be a predefined cell, or a fixed cell, without limitation. The second sub-cell may be the same cell as the third sub-cell or a different cell, without limitation.

Optionally, in case that 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 cell, the first sub-cell may further include an identifier of the second RLC bearer, and the first sub-cell is further configured to indicate a correspondence between the identifier of the radio bearer, the identifier of the second terminal device, and the identifier of the second RLC bearer.

Alternatively, in case that 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 cells, the configuration information of the Uu adaptation layer of the first terminal device may be included in the second cell, and the configuration information of the PC5 adaptation layer of the first terminal device may be included in the third cell. The second cell may be a predefined cell, or a fixed cell, without limitation. For example, the second cell may be a Uu-Adapt-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation. The third cell may be a predefined cell, or a fixed cell, without limitation. For example, the third cell may be a PC 5-adapter-Config cell, or a cell of similar definition or function, or an extension field cell, without limitation.

Alternatively, in case the first adaptation layer entity of the first terminal device submits the identity of the second terminal device to the second adaptation layer entity of the first terminal device, the second cell may comprise a second sub-cell and the third cell may comprise the first sub-cell.

Alternatively, the third cell may comprise the first sub-cell and the third sub-cell in case the first adaptation layer entity of the first terminal device does not submit the identity of the second terminal device to the second adaptation layer entity of the first terminal device.

In this application, when the embodiment shown in fig. 7A and fig. 7B is adopted as the scheme for downlink data transmission and the embodiment shown in fig. 8A and fig. 8B is adopted as the scheme for uplink data transmission, the configuration information received by the first terminal device from the access network device includes the first configuration information related to the embodiment shown in fig. 7A and fig. 7B and the first configuration information related to the embodiment shown in fig. 8A and fig. 8B, that is, the access network device may simultaneously send the configuration information related to the downlink data transmission and the configuration information related to the uplink data transmission to the first terminal device. It will be appreciated 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 may be contained in the same cell or in different cells, without limitation. 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 cell, 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 according to the embodiment shown in fig. 7A and fig. 7B are included in the same cell, and 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 according to the embodiment shown in fig. 8A and fig. 8B are included in the same cell. 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 cells, the configuration information of the Uu adaptation layer of the first terminal device according to the embodiment shown in fig. 7A and fig. 7B, and the configuration information of the Uu adaptation layer of the first terminal device according to the embodiment shown in fig. 8A and fig. 8B are both included in the same cell; the configuration information of the PC5 adaptation layer of the first terminal device according to the embodiment shown in fig. 7A and 7B and the configuration information of the PC5 adaptation layer of the first terminal device according to the embodiment shown in fig. 8A and 8B are both contained in the same cell.

Hereinafter, with reference to fig. 9, how to correctly deliver the downlink data will be described from the second terminal device side.

Referring to fig. 9, fig. 9 is a schematic flow chart of another data transmission method according to an embodiment of the present application. As shown in fig. 9, the method includes, but is not limited to, the steps of:

901. the adaptation layer entity of the second terminal device receives second data from the RLC bearer of the second terminal device, the second data comprising second indication information.

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

Alternatively, the adaptation layer entity of the second terminal device may receive data from at least one RLC bearer and/or data from at least one PDCP layer entity, without limitation. It is understood that the RLC bearer of the second terminal apparatus in step 901 may be one RLC bearer of the at least one RLC bearer. The RLC bearer of the second terminal device is a PC5RLC bearer of the second terminal device.

Optionally, the second indication information is used for indicating a radio bearer corresponding to the second terminal device that receives the second data. The second indication information is an identity of the radio bearer, or the second indication information includes an identity of the radio bearer and an identity of the second terminal device.

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 submits the second data to the adaptation layer entity of the second terminal device.

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.

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

Optionally, if the second indication information includes an identifier of the radio bearer, step 902 may include: the adaptation layer entity of the second terminal equipment submits the second data to the PDCP layer entity of the second terminal equipment according to the identification of the radio bearer and the first corresponding relation, so that the adaptation layer entity of the second terminal equipment can correctly submit the downlink data, and the reliability of the downlink data transmission is improved. That is, in case the second indication information comprises an identity of the radio bearer, or in case the second indication information comprises an identity of the radio bearer and an identity of the second terminal device, the adaptation layer entity of the second terminal device may submit the second data to the PDCP layer entity of the second terminal device according to the identity of the radio bearer and the first correspondence.

Wherein the first correspondence comprises a correspondence between an identity of the radio bearer and an identity of a PDCP layer entity of the second terminal device.

Optionally, the embodiment shown in fig. 9 may further include: the second terminal equipment receives the first configuration information from the access network equipment, and correspondingly, the access network equipment sends the first configuration information to the second terminal equipment. Wherein the first configuration information includes one of: the first corresponding relation and the second corresponding relation; the first configuration information is used for indicating that the first corresponding relation and/or the second corresponding relation is the configuration information of the adaptation layer of the second terminal equipment. It may be understood that, in the case where the second indication information is an identifier of the radio bearer, the first configuration information includes a first correspondence, where the first configuration information is used to indicate that the first correspondence is configuration information of an adaptation layer of the second terminal device; and under the condition that the second indication information is the identifier of the radio bearer and the identifier of the second terminal equipment, the first configuration information comprises a second corresponding relation, and the first configuration information is used for indicating that the second corresponding relation is the configuration information of the adaptation layer of the second terminal equipment.

The first configuration information may be included in RRC signaling or other signaling, which is not limited herein. It will be appreciated that the first configuration information may be sent by the access network device to the second terminal device when the access network device receives the 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 autonomously, without limitation. The configuration information request message may be used to instruct the access network device to send the first configuration information.

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.

Hereinafter, with reference to fig. 10, how uplink data is correctly delivered from the second terminal device side will be described.

Referring to fig. 10, fig. 10 is a schematic flow chart of another data transmission method according to an embodiment of the present application. As shown in fig. 10, the method includes, but is not limited to, the steps of:

1001. The adaptation layer entity of the second terminal equipment generates second data; the second data includes first data and second indication information, the first data being data received by an adaptation layer entity of the second terminal device from a PDCP layer entity of the second terminal device.

Optionally, the second indication information is used for indicating a radio bearer, or the second indication information is used for indicating a radio bearer corresponding to the second terminal device receiving the second data. It is understood that in the case where the second indication information is used to indicate a radio bearer, the second indication information is an identification of the radio bearer. In the case that the second indication information is used for indicating a radio bearer corresponding to the second terminal device that receives the second data, the second indication information includes an identification of the radio bearer and an identification of the second terminal device. The identification of the second terminal device may be received by the second terminal device from the access network device.

Illustratively, in one possible implementation, the first terminal device requests allocation of the identity of the second terminal device to the access network device via an RRC message, e.g. (SidelinkUEInformationNR, SUI) message, before the second terminal device establishes the RRC connection. After the access network is allocated, the identifier of the allocated second terminal equipment is issued to the first terminal equipment through the RRC message, and then the first terminal equipment informs the identifier of the second terminal equipment to the second terminal equipment through the SL. The identifier of the second terminal device may be sent to the second terminal device by a sidelink RRC message, a PC5 signaling, or a MAC CE message, etc. In yet another possible implementation manner, the access network device may receive an RRC setup request (RRCSetup request) message sent by the second terminal device, i.e. after the second terminal device initiates RRC connection setup, the identity of the second terminal device is carried in the replied RRC setup (RRCSetup) message.

1002. And the adaptation layer entity of the second terminal equipment submits the second data to the RLC bearer of the second terminal equipment according to the second indication information.

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

Alternatively, the adaptation layer entity of the second terminal device may receive data from at least one RLC bearer and/or data from at least one PDCP layer entity, without limitation. It is understood that the RLC bearer of the second terminal apparatus in step 1002 may be one of the at least one RLC bearer. The RLC bearer of the second terminal device is a PC5RLC bearer of the second terminal device.

Optionally, if the second indication information is an identifier of the radio bearer, step 1002 may include: the adaptation layer entity of the second terminal equipment submits the second data to the RLC bearer of the second terminal equipment according to the identifier of the radio bearer and the first corresponding relation, so that the adaptation layer entity of the second terminal equipment can correctly submit the uplink data, and the reliability of uplink data transmission is improved.

Wherein the first correspondence comprises a correspondence between an identity of a radio bearer and an identity of an RLC bearer of the second terminal device.

Optionally, if the second indication information includes an identifier of the radio bearer and an identifier of the second terminal device, step 1002 may include: the adaptation layer entity of the second terminal equipment submits the second data to the RLC bearer of the second terminal equipment according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the adaptation layer entity of the second terminal equipment can correctly submit the uplink data, and the reliability of uplink data transmission is improved.

Optionally, the embodiment shown in fig. 10 may further include: the second terminal equipment receives the first configuration information from the access network equipment, and correspondingly, the access network equipment sends the first configuration information to the second terminal equipment. Wherein the first configuration information includes one of: the first configuration information is used for indicating that the first corresponding relation or the second corresponding relation is the configuration information of the adaptation layer of the second terminal equipment. It may be understood that, in the case where the second indication information is an identifier of the radio bearer, the first configuration information includes a first correspondence, where the first configuration information is used to indicate that the first correspondence is configuration information of an adaptation layer of the second terminal device; and under the condition that the second indication information is the identifier of the radio bearer and the identifier of the second terminal equipment, the first configuration information comprises a second corresponding relation, and the first configuration information is used for indicating that the second corresponding relation is the configuration information of the adaptation layer of the second terminal equipment.

In this application, the configuration information received by the second terminal device from the access network device includes the first configuration information related to the embodiment shown in fig. 9 and the first configuration information related to the embodiment shown in fig. 10, that is, the access network device may send the configuration information related to the downlink data transmission and the configuration information related to the uplink data transmission to the second terminal device at the same time.

Hereinafter, with reference to fig. 11, how to correctly deliver downlink data will be described from the access network device side.

Referring to fig. 11, fig. 11 is a schematic flow chart of another data transmission method according to an embodiment of the present application. As shown in fig. 11, the method includes, but is not limited to, the steps of:

1101. an adaptation layer entity of the access network equipment generates second data; the second data includes first data and second indication information, the first data being data received by an adaptation layer entity of the access network device from a PDCP layer entity of the access network device.

Optionally, the second indication information is used for indicating a radio bearer corresponding to the second terminal device receiving the second data, and the second indication information includes an identifier of the radio bearer and an identifier of the second terminal device.

The PDCP layer entity of the access network device is configured to transmit data corresponding to the second terminal device.

1102. And the adaptation layer entity of the access network equipment submits the second data to the RLC bearer of the access network equipment according to the second indication information.

Correspondingly, the RLC bearer of the access network device obtains the second data from the 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 and the first terminal device communicate, that is, the RLC bearer of the access network device is a UuRLC bearer used when the access network device and the first terminal device communicate.

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

Optionally, step 1102 may include: the adaptation layer entity of the access network equipment submits the second data to the RLC bearer of the access network equipment according to the identifier of the radio bearer, the identifier of the second terminal equipment and the first corresponding relation, so that the adaptation layer entity of the access network terminal equipment can correctly submit the downlink data, and the reliability of the downlink data transmission is improved.

The first correspondence includes correspondence among an identifier of a radio bearer, an identifier of a second terminal device, and an RLC bearer of an access network device.

Hereinafter, with reference to fig. 12, how uplink data is correctly delivered from the access network device side will be described.

Referring to fig. 12, a flowchart of another data transmission method provided in the embodiment of the present application is shown in fig. 12. As shown in fig. 12, the method includes, but is not limited to, the steps of:

1201. the adaptation layer entity of the access network device receives second data from the RLC bearer of the access network device, the second data comprising second indication information.

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

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.

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

Optionally, step 1202 may include: the adaptation layer entity of the access network equipment submits the second data to the PDCP layer entity of the access network equipment according to the identification of the radio bearer, the identification of the second terminal equipment and the first corresponding relation, so that the adaptation layer entity of the access network equipment can correctly submit the uplink data, and the reliability of uplink data transmission is improved.

Wherein the first correspondence includes a correspondence between an identity of the radio bearer, an identity of the second terminal device, and a PDCP layer entity of the access network device.

In the following, a flow of transmitting downstream data from the access network device to the second terminal device through the first terminal device and a flow of transmitting upstream data from the second terminal device to the access network device through the first terminal device are exemplarily described with reference to fig. 13A and 13B. It can be understood that in fig. 13A, only one PC5 adaptation layer entity is configured for the first terminal device, and the PC5 adaptation layer entity is a PC5 RLC bearer common adaptation layer entity corresponding to at least one remote terminal device; in fig. 13B, a plurality of PC5 adaptation layer entities are configured in the first terminal device, and one PC5 adaptation layer entity in the plurality of PC5 adaptation layer entities is an adaptation layer entity used by a PC5 RLC bearer corresponding to one remote terminal device.

As shown in fig. 13A and fig. 13B, in the downlink data transmission scheme, the adaptation layer entity of the access network device receives first data from the higher layer protocol layer entity corresponding to the second terminal device, that is, the adaptation layer entity of the access network device receives first data from the PDCP layer entity of the access network device, where the PDCP layer entity of the access network device is configured to transmit data corresponding to the second terminal device; next, actions performed by the adaptation layer entity of the access network device may refer to steps 1101-1102 of fig. 11; then, the first terminal equipment receives second data from the access network equipment through the first RLC bearer; then, with respect to fig. 13A, the actions performed at the first terminal device may refer to steps 501-502 in fig. 5A, and with respect to fig. 13B, the actions performed at the first terminal device may refer to steps 701-702 in fig. 7A, which are not described herein; further, the second terminal device receives second data from the first terminal device through the RLC bearer of the second terminal device; the actions performed at the second terminal device may then refer to steps 901-902 of fig. 9. It can be appreciated 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 an identifier of the radio bearer, the adaptation layer entity of the second terminal device submits the second data to the PDCP layer entity of the second terminal device according to the identifier of the radio bearer and a first correspondence relationship, where the first correspondence relationship includes a correspondence relationship 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 submits 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 a second correspondence, where the second correspondence includes a 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.

As shown in fig. 13A and 13B, in the uplink data transmission scheme, an adaptation layer entity of the second terminal device receives first data from a PDCP layer entity of the second terminal device; next, the actions performed by the adaptation layer entity of the second terminal device may refer to steps 1001-1002 of fig. 10; then, the first terminal device receives second data from the second terminal device through the second RLC bearer; then, with respect to fig. 13A, the actions performed at the first terminal device may refer to steps 601 to 602 in fig. 6A, and with respect to fig. 13B, the actions performed at the first terminal device may refer to steps 801 to 802 in fig. 8A, which are not described herein; further, the access network device receives second data from the first terminal device through the RLC bearer of the access network device; the actions performed at the access network device may then refer to steps 1201-1202 of fig. 12. It may be appreciated that when the second data generated by the adaptation layer entity of the second terminal device includes an identifier of the radio bearer, the adaptation layer entity of the second terminal device submits the second data to the RLC bearer of the second terminal device according to the identifier of the radio bearer and a first correspondence, where the first correspondence includes a 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 equipment comprises the identifier of the radio bearer and the identifier of the second terminal equipment, the adaptation layer entity of the second terminal equipment submits the second data to the RLC bearer of the second terminal equipment according to the identifier of the radio bearer, the identifier of the second terminal equipment and a second corresponding relation, wherein the second corresponding relation comprises the corresponding relation among the identifier of the radio bearer, the identifier of the second terminal equipment and the identifier of the RLC bearer of the second terminal equipment.

It should be noted that, in this application, for the downlink data transmission scheme, in the case where the actions performed by the first terminal device may refer to steps 501 to 502 in fig. 5A, the actions performed by the first terminal device may refer to steps 601 to 602 in fig. 6A in the uplink data transmission scheme; for the downlink data transmission scheme, the actions performed at the first terminal device refer to steps 701-702 of fig. 7A, and for the uplink data transmission scheme, the actions performed at the first terminal device may refer to steps 801-802 of fig. 8A.

In addition, the flow of transmitting downlink data from the access network device to the other terminal device through the first terminal device may refer to the flow 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 may refer to the process of transmitting uplink data from the second terminal device to the access network device through the first terminal device, which is not described herein.

In addition, the scheme may also relate to the distinction between the second terminal equipment bearer and the first terminal equipment bearer. On uulink, the radio bearer of the first terminal device refers to a radio bearer for communication between the first terminal device and the access network device, and carries data interacted between the access network device and the first terminal device. On the sidelink, the radio bearer of the first terminal device refers to a radio bearer for communication between the first terminal device and the second terminal device, and carries data interacted between the first terminal device and the second terminal device directly through the sidelink.

As mentioned above, the main function of the adaptation layer is to multiplex data on different radio bearers onto one RLC bearer, and the above embodiments only consider the case where radio bearers of different terminal devices are multiplexed on an RLC bearer. In addition, the adaptation layer may multiplex the radio bearer of the second terminal device and the radio bearer of the first terminal device onto one RLC bearer, where the adaptation layer needs to distinguish the two during the routing process.

One possible implementation is that the access network device also assigns an identification of the second terminal device for indication to the first terminal device and informs the first terminal device. When the radio bearer data of the first terminal device and the radio bearer data of the second terminal device are multiplexed on one Uu RLC bearer, the adaptation layer carries the allocated identity of the second terminal device on the adaptation layer PDU header of the radio bearer data of the first terminal device. Alternatively, the identity of the second terminal device may be given directly by the protocol. Another possible implementation is to introduce indication information on the adaptation layer PDU header for indicating whether the data is of the second terminal device or of the first terminal device. For example, the indication information may be 1bit, 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.

Based on the above manner, in the uplink transmission process, the adaptation layer of the first terminal device adds the identifier or the indication information of the second terminal device on the head of the adaptation layer PDU, and sends the identifier or the indication information to the access network device, and after the access network device receives the data, the access network device delivers the data to the upper entity of the second terminal device or the upper entity of the first terminal device according to the identifier or the 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 on the adaptation layer PDU head, and after the first terminal device receives the data, the first terminal device submits its own data to the upper layer of the first terminal device or carries the data of the second terminal device corresponding to the PC5 RLC of the second terminal device according to the identification or indication information of the second terminal device on the adaptation layer PDU head.

When the data of the first terminal device and the data of the second terminal device are multiplexed on one PC5 RLC bearer, if the second terminal device carries the identifier of the second terminal device on the adaptation layer header in uplink data transmission, the data can be distinguished in the mode; if the second terminal device does not sense the identifier of the second terminal device, the manner of carrying the indication information can be used.

In order to distinguish between the data of the first terminal device and the data of the second terminal device, it is also possible to define whether the data of the first terminal device and the data of the second terminal device cannot be multiplexed on one RLC bearer, in which case the UE knows whether the data on the different RLC bearers belong to the second terminal device or the first terminal device depending on the configuration of the access network device.

Second, the present solution may also involve the differentiation of SRBs and DRBs. It can be appreciated that the radio bearer of the second terminal device in the above embodiment includes both DRB and SRB. In the prior art, the bearer between a terminal device and an access network device may include at most SRBs 1 to SRB3 and 32 DRBs, so that the access network device uses 2 bits to identify SRBs 1 to 3, respectively corresponding to identifications 1 to 3, and uses 5 bits to identify DRBs 1 to DRBs 32, respectively corresponding to identifications 1 to 32. Based on the existing radio bearer identification (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 identification of 1-3.

One possible implementation is to add 1bit of indication information to the adaptation layer header to indicate the bearer type, for example, the indication information corresponds to SRB data when 0 and corresponds to DRB data when 1. According to the indication information and the RB ID, the adaptation layer can uniquely determine which radio bearer the data belongs to, where the RB ID is in a binary form of 5 bits, for example, if the adaptation layer PDU header includes information of indication information "0" and RB ID 2, the adaptation layer PDU includes data of SRB 2.

Another possible implementation manner is that the access network device remaps the SRB ID and the DRB ID so that the numbers of the SRB ID and the DRB ID are not repeated, and informs the first terminal device and the second terminal device of ID information after the remapping, which is used for adding and identifying RB ID information on the adaptation layer header. For example, the access network device configures the identifiers of SRBs 1 to 3 to 1 to 3, configures the identifiers of DRBs 1 to 32 to 4 to 35, and informs the first terminal device and the second terminal device of the correspondence between SRBs/DRBs and the identifiers. After remapping, the RB ID may be up to 35, so 6bit space needs to be reserved on the adaptation layer PDU header to carry RB ID information.

In another possible way, the above-mentioned remapping relation may be directly given by the protocol, i.e. the RB IDs of the specified SRBs 1-3 correspond to 1-3 and the RB IDs of the drbs 1-32 correspond to 4-35; or alternatively, the process may be performed,

yet another possible implementation is to define that the SRB data and the DRB data cannot be multiplexed on one RLC bearer, where the first terminal device and the second terminal device can know whether the data on different RLC bearers is SRB data or DRB data according to the configuration of the access network device.

The above description has been presented mainly from the point of interaction between the network elements. It will be appreciated that, in order to achieve the above-mentioned functions, each network element includes a corresponding hardware structure and/or software module for performing each function. Those of skill in the art will readily appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The embodiment of the application may divide the functional modules of the first terminal device, the second terminal device, the access network device, and the like according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module, where the integrated modules may be implemented in a form of hardware or a form of software functional module. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation.

In the case of using an integrated unit, referring to fig. 14, fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device 1400 can be applied to the method shown in fig. 5A-12, as shown in fig. 14, and the communication device 1400 includes: a processing module 1401 and a transceiver module 1402. The processing module 1401 may be one or more processors and the transceiver module 1402 may be a transceiver or a communication interface. The communication device may be used to implement the functionality relating to the first terminal device, the second terminal device, the access network device in any of the method embodiments described above, or to implement the functionality relating to the network element in any of the method embodiments described above. The network element or network function may be either a network element in a hardware device, a software function running on dedicated hardware, or a virtualized function instantiated on a platform (e.g., a cloud platform). Optionally, the communication device 1400 may further comprise a storage module 1403 for storing program code and data of the communication device 1400.

When the communication device is used as the first terminal device or as a chip applied in the first terminal device, for example, the steps performed by the first terminal device in the above-described method embodiments are performed. The transceiver module 1402 is configured to support communication with a second terminal device or an access network device, etc., the transceiver module 1402 is further configured to communicate between different protocol layer entities in the first terminal device, such as actions of the transceiver module 1402 for transmitting and/or receiving performed by the first adaptation layer entity of the first terminal device in fig. 5A-8B, specifically, the transceiver module 1402 is configured to perform one or more of

steps

501, 601, 701, 801, and/or other procedures for the techniques described herein by the first adaptation layer entity of the first terminal device. In addition, transceiver module 1402 is configured to perform the actions of transmitting and/or receiving by the second adaptation layer entity of the first terminal device in fig. 5A-8B, e.g., transceiver module 1402 is configured to perform one or more of

steps

502, 602, 702, 802, and/or other processes for the techniques described herein by the second adaptation layer entity of the first terminal device. The processing module 1401 may be configured to support the communication apparatus 1400 to perform the processing actions in the above-described method embodiments, e.g. the processing module 1401 is configured to perform the processing actions described herein by the first adaptation layer entity of the first terminal device or the second adaptation layer entity of the first terminal device.

When the communication device is used as the second terminal device or as a chip applied in the second terminal device, for example, the steps performed by the second terminal device in the above-described method embodiments are performed. The transceiver module 1402 is configured to support communication with a first terminal device or an access network device, etc., the transceiver module 1402 is also configured to communicate between different protocol layer entities in a second terminal device, such as actions of the transceiver module 1402 for transmitting and/or receiving performed by an adaptation layer entity of the second terminal device in fig. 9-10, specifically, the transceiver module 1402 is configured to perform one or more of

steps

901, 902, 1002, and/or other procedures for techniques described herein by the adaptation layer entity of the second terminal device. The processing module 1401 may be configured to support the communication apparatus 1400 to perform the processing actions in the method embodiment described above, e.g. the processing module 1401 is configured to perform step 1001 in fig. 10 by means of an adaptation layer entity of the second terminal device.

When the communication device is an access network device or a chip applied in an access network device, for example, the steps performed by the access network device in the above-mentioned method embodiments are performed. The transceiver module 1402 is for supporting communication with a first terminal device or the like, the transceiver module 1402 is also for communication between different protocol layer entities in an access network device, such as the transceiver module 1402 being for performing transmit and/or receive actions by an adaptation layer entity of the access network device in fig. 11-12, e.g., the adaptation layer entity supporting the access network device performing one or more of

steps

1102, 1201, 1202, and/or other procedures for the techniques described herein. The processing module 1401 may be configured to support the communication apparatus 1400 to perform the processing actions in the method embodiment described above, e.g. the processing module 1401 is configured to perform step 1101 in fig. 11 by an adaptation layer entity of an access network device.

In one 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, a circuit, or the like. The interface may be used to input data to be processed to the processor, and may output a processing result of the processor to the outside. In a specific implementation, the interface may be a general purpose input output (general purpose input output, GPIO) interface, which may be connected to a plurality of peripheral devices (e.g., a display (LCD), a camera (cam), a Radio Frequency (RF) module, an antenna, etc.). The interface is connected with the processor through a bus.

The processing module 1401 may be a processor that may execute computer-executable instructions stored by the storage module to cause the chip to perform the methods related to the embodiments of fig. 5A-12.

Further, the processor may include a controller, an operator, and a register. Illustratively, the controller is primarily responsible for instruction decoding and issues control signals for the operations to which the instructions correspond. The arithmetic unit is mainly responsible for performing fixed-point or floating-point arithmetic operations, shift operations, logic operations, and the like, and may also perform address operations and conversions. The register is mainly responsible for storing register operands, intermediate operation results and the like temporarily stored in the instruction execution process. In particular implementations, the hardware architecture of the processor may be an application specific integrated circuit (application specific integrated circuits, ASIC) architecture, a microprocessor (microprocessor without interlocked piped stages architecture, MIPS) architecture of an interlocking-free pipeline stage architecture, an advanced reduced instruction set machine (advanced RISC machines, ARM) architecture, or a network processor (network processor, NP) architecture, among others. The processor may be single-core or multi-core.

The memory module may be a memory module within the chip, such as a register, a cache, etc. The Memory module may also be a Memory module located outside the chip, such as a Read Only Memory (ROM) or other type of static storage device that can store static information and instructions, a random access Memory (Random Access Memory, RAM), etc.

It should be noted that, the functions corresponding to the processor and the interface may be implemented by hardware design, or may be implemented by software design, or may be implemented by a combination of software and hardware, which is not limited herein.

Fig. 15 is a schematic structural diagram of a simplified terminal device according to an embodiment of the present application. In fig. 15, the terminal device is taken as an example of a mobile phone, and it is understood that the terminal device referred to in fig. 15 may be the first terminal device or the second terminal device, which is not limited herein. As shown in fig. 15, the terminal device includes at least one processor, and may further include a radio frequency circuit, an antenna, and an input-output device. The processor may be used for processing communication protocols and communication data, controlling the terminal device, executing a software program, processing data of the software program, and the like. The terminal device may also comprise a memory for storing mainly software programs and data, which programs may be loaded into the memory at the time of shipment of the communication device or reloaded into the memory at a later time when needed. The radio frequency circuit is mainly used for converting a baseband signal and a radio frequency signal and processing the radio frequency signal. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves, and the antenna is provided by the embodiment of the application. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user. It should be noted that some kinds of terminal apparatuses may not have an input/output device.

When data need to be sent, the processor carries out baseband processing on the data to be sent and then outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit carries out radio frequency processing on the baseband signal and then sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of illustration, only one memory and processor is shown in fig. 15. In an actual end 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 storage device, etc. The memory may be provided separately from the processor or may be integrated with the processor, which is not limited by the embodiments of the present application.

In the embodiment of the present application, the antenna and the radio frequency circuit having the transceiver function may be regarded as a receiving unit and a transmitting unit (may also be collectively referred to as a transceiver unit) of the terminal device, and the processor having the processing function may be regarded as a processing unit of the terminal device. As shown in fig. 15, the terminal device includes a receiving module 31, a processing module 32, and a transmitting module 33. The receiving module 31 may also be referred to as a receiver, a receiving circuit, etc., and the transmitting module 33 may also be referred to as a transmitter, a transmitting circuit, etc. The processing module 32 may also be referred to as a processor, processing board, processing device, etc.

For example, the processing module 32 is configured to perform the functions of the first terminal device in any of the embodiments shown in fig. 5A-8A.

Fig. 16 is a schematic structural diagram of a simplified access network device according to an embodiment of the present application. The access network device comprises a radio frequency signal transceiving and converting part and a part 42, wherein the radio frequency signal transceiving and converting part comprises a receiving module 41 part and a transmitting module 43 part (which may also be collectively called as transceiving module). The radio frequency signal receiving and transmitting and converting part is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals and baseband signals; the 42 part is mainly used for baseband processing, control of access network equipment and the like. The receiving module 41 may also be referred to as a receiver, a receiving circuit, etc., and the transmitting module 43 may also be referred to as a transmitter, a transmitting circuit, etc. Portion 42 is typically a control center of the access network device, and may be generally referred to as a processing module, for controlling the access network device to perform the steps performed in connection with the access network device in fig. 11-12 described above. See for details the description of the relevant parts above.

The portion 42 may include one or more boards, each of which may include one or more processors and one or more memories, the processors being configured to read and execute programs in the memories to implement baseband processing functions and control access to the network device. If there are multiple boards, the boards can be interconnected to increase processing power. As an alternative implementation manner, the multiple boards may share one or more processors, or the multiple boards may share one or more memories, or the multiple boards may share one or more processors at the same time.

For example, the sending module 43 is configured to perform the functions of the access network device in any of the embodiments shown in fig. 11-12, for the access network device.

The embodiment of the application also provides a communication device, which comprises a processor, a memory, an input interface and an output interface, wherein the input interface is used for receiving information from other communication devices except the communication device, the output interface is used for outputting information to other communication devices except the communication device, and the processor calls a computer program stored in the memory to realize any embodiment shown in fig. 5A-12.

Embodiments of the present application also provide a computer readable storage medium having a computer program stored therein, which when executed, implements any of the embodiments shown in fig. 5A-12.

Embodiments of the present application also provide a computer program product which, when read and executed by a computer, causes the computer to perform implementing any of the embodiments shown in fig. 5A-12.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of 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 in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be realized in the form of hardware or in the form of software network element units.

The integrated units described above, if implemented in the form of software network element units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a cloud server, or a network device, etc.) to perform all or part of the steps of the above-described method of the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes. While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A data transmission method, wherein the method is applied to a first terminal device, and the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, the first RLC bearer is used for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer is used for transmitting data from the at least one terminal device, the method comprising:

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the first indication information comprises an identifier of the radio bearer and an identifier of the second terminal equipment; or alternatively, the first and second heat exchangers may be,

3. The method according to claim 1 or 2, wherein the second adaptation layer entity of the first terminal device handing over the first data to the second RLC bearer according to the first indication information comprises:

4. A method according to claim 3, wherein if the first indication information comprises an identity of the radio bearer and an identity of the second terminal device, the method further comprises:

5. A method according to claim 3, wherein if the first indication information comprises an identification of the radio bearer and identification information of a unicast connection on a side link, the side link being a side link between the first terminal device and the second terminal device, the side link corresponding to at least one RLC bearer, the second adaptation layer entity of the first terminal device submitting the first data to the second RLC bearer according to the identification of the radio bearer, the identification of the second terminal device and a first correspondence, comprising:

6. The method of claim 5, wherein the first indication information further comprises an identification of the second terminal device.

7. The method according to any one of claims 4-6, further comprising:

8. The method according to claim 1 or 2, wherein if the first indication information comprises an identification of the radio bearer and identification information of a unicast connection on a side-link between the first terminal device and the second terminal device, the second adaptation layer entity of the first terminal device submitting the first data to the second RLC bearer according to the first indication information, comprising:

9. The method of claim 8, wherein the method further comprises:

10. The method according to claim 5 or 7, characterized in that the method further comprises:

11. The method according to any one of claims 1-10, wherein the method further comprises:

the first corresponding relation is configuration information of the second adaptation layer of the first terminal equipment;

the second corresponding relation is configuration information of the first adaptation layer of the first terminal equipment and/or the second adaptation layer of the first terminal equipment;

the third corresponding relation is configuration information of the second adaptation layer of the first terminal equipment;

12. A data transmission method, wherein the method is applied to a first terminal device, and the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, the first RLC bearer is used for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer is used for transmitting data from the at least one terminal device, the method comprising:

13. The method of claim 10, wherein the step of determining the position of the first electrode is performed,

14. The method according to claim 12 or 13, wherein if the first indication information comprises an identity of the radio bearer and an identity of the second terminal device, the method further comprises:

15. The method according to claim 12 or 13, wherein if the first indication information comprises an identification of the radio bearer and identification information of a unicast connection on a side-link, the side-link being between the first terminal device and the second terminal device, the method further comprises:

16. The method according to any of the claims 12-15, wherein the second adaptation layer entity of the first terminal device submitting the first data to the first RLC bearer according to the first indication information comprises:

17. The method of claim 16, wherein the method further comprises:

18. The method according to any one of claims 12-17, further comprising:

19. A data transmission method, wherein the method is applied to a second terminal device, the method comprising:

20. The method of claim 19, wherein if the second indication information includes an identification of the radio bearer, the adaptation layer entity of the second terminal device handing over the second data to the PDCP layer entity of the second terminal device according to the second indication information, comprising:

21. A data transmission method, wherein the method is applied to a second terminal device, the method comprising:

22. The method of claim 21, wherein if the second indication information includes an identification of the radio bearer, the second terminal device's adaptation layer entity handing over the second data to the second terminal device's RLC bearer according to the second indication information, comprising:

23. The method according to claim 21 or 22, characterized in that the method further comprises:

24. A method of data transmission, the method being applied to an access network device, the method comprising:

25. The method of claim 24, wherein the second indication information includes an identity of the radio bearer and an identity of the second terminal device, and wherein the adaptation layer entity of the access network device submits the second data to the RLC bearer of the access network device according to the second indication information, comprising:

26. A method of data transmission, the method being applied to an access network device, the method comprising

27. The method of claim 26, wherein the second indication information includes an identity of a radio bearer and an identity of a second terminal device, and wherein the adaptation layer entity of the access network device submits the second data to the PDCP layer entity of the access network device according to the second indication information, comprising:

28. A communication apparatus, characterized in that the communication apparatus is a first terminal device, the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, the first RLC bearer is used for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer is used for transmitting data from the at least one terminal device, the first terminal device comprises a transceiver module,

29. A communication apparatus, characterized in that the communication apparatus is a first terminal device, the first terminal device uses a first radio link to control an RLC bearer when communicating with an access network device, the first RLC bearer is used for transmitting data corresponding to at least one terminal device from the access network device and/or the first RLC bearer is used for transmitting data from the at least one terminal device, the first terminal device comprises a transceiver module,

30. A communication device is characterized in that the communication device is a second terminal device, the second terminal device comprises a transceiver module,

31. A communication device is characterized in that the communication device is a second terminal device, the second terminal device comprises a receiving and transmitting module and a processing module,

32. A communication device is characterized in that the communication device is access network equipment, the access network equipment comprises a transceiver module and a processing module,

and the receiving and transmitting module is used for delivering the second data to the Radio Link Control (RLC) bearer of the access network equipment according to the second indication information through the adaptation layer entity of the access network equipment.

33. A communication device is characterized in that the communication device is an access network device, the access network device comprises a transceiver module,

The transceiver module is configured to receive, through an adaptation layer entity of the access network device, second data from a radio link control RLC bearer of the access network device; the second data comprises second indication information, wherein the second indication information is used for indicating a radio bearer corresponding to second terminal equipment for receiving the second data;

34. A communication device comprising a processor and a memory, the processor invoking a computer program stored in the memory to perform the method of any of claims 1-27.

35. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program which, when run, implements the method according to any of claims 1-27.

36. A computer program product comprising instructions which, when executed on a computer, cause the method of any of claims 1-27 to be performed.