US-12628036-B2 - Data transmission method and apparatus

US12628036B2US 12628036 B2US12628036 B2US 12628036B2US-12628036-B2

Abstract

Methods and apparatus are provided for data transmission. A remote device determines a sidelink multicast identifier identifying multicast between the remote device and a plurality of relay devices and sends uplink data to the plurality of relay devices in a multicast manner based on the sidelink multicast identifier. The uplink data is data sent by the remote device to a radio access network device. The remote device determines the sidelink multicast identifier, and sends the sidelink multicast identifier to the relay device to transmit the uplink data to the radio access network device based on multicast communication to improve uplink data transmission efficiency.

Inventors

Wenjie Peng

Assignees

HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20230530

Claims (16)

1 . A data transmission method, comprising: obtaining, by a remote device, first indication information indicating a splitting proportion of a data volume of a packet data convergence protocol (PDCP) entity; and calculating, by the remote device, a buffer status (BS) based on the splitting proportion indicated by the first indication information; wherein: the splitting proportion comprises a data proportion of a data volume of the PDCP entity and that is allocated to at least one of a first link or a data proportion of a data volume that is of the PDCP entity and that is allocated to a second link, the first link for carrying uplink data transmitted by the remote device to a radio access network device, and the second link for carrying uplink data transmitted by the remote device to the radio access network device through a plurality of relay devices; the calculating a BS based on the splitting proportion comprises calculating a BS in at least one of a first buffer status report (BSR) based on the splitting proportion or calculating a BS in a second BSR based on the splitting proportion, wherein the first BSR provides for requesting to schedule a Uu uplink resource, and the second BSR provides for requesting to schedule a sidelink resource; and sending, by the remote device, at least one of the first BSR or the second BSR to the radio access network device.
2 . The method according to claim 1 , wherein the obtaining first indication information comprises: receiving, by the remote device, the first indication information from the radio access network device; or obtaining, by the remote device, the first indication information locally preconfigured by the remote device.
3 . The method according to claim 1 , wherein the calculating a buffer status (BS) comprises one of: allocating all data volumes of the PDCP entity to the BS in the first BSR and sending the first BSR to the radio access network device; allocating all data volumes of the PDCP entity to the BS in the second BSR and sending the second BSR to the radio access network device; or proportionately allocating the data volumes of the PDCP entity to the BS in the first BSR and to the BS in the second BSR, wherein a range of the proportional allocation for the splitting proportion is greater than 0 and less than 1, and sending the first BSR and the second BSR to the radio access network device.
4 . The method according to claim 1 , wherein the splitting proportion is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.
5 . The method according to claim 1 , wherein the first indication information further comprises a bearer identifier corresponding to the splitting proportion.
6 . The method according to claim 1 , the method further comprising receiving, by the remote device, second indication information from the network device, the second indication information including an instruction for the remote device to schedule the Uu uplink resource and the sidelink resource.
7 . An apparatus comprising: at least one processor, and a memory coupled to the at least one processor and storing instructions for execution by the at least one processor that, when executed, the instructions cause the apparatus to perform operations comprising: obtaining first indication information indicating a splitting proportion of a data volume of a packet data convergence protocol (PDCP) entity; and calculating a buffer status (BS) based on the splitting proportion indicated by the first indication information; wherein: the splitting proportion comprises a data proportion of a data volume of the PDCP entity and that is allocated to at least one of a first link or a data proportion of a data volume that is of the PDCP entity and that is allocated to a second link, the first link for carrying uplink data transmitted by a remote device to a radio access network device, and the second link for carrying uplink data transmitted by the remote device to the radio access network device through a plurality of relay devices; the calculating a BS based on the splitting proportion comprises calculating a BS in at least one of a first buffer status report (BSR) based on the splitting proportion or calculating a BS in a second BSR based on the splitting proportion, wherein the first BSR provides for requesting to schedule a Uu uplink resource, and the second BSR is for requesting to schedule a sidelink resource; and sending at least one of the first BSR or the second BSR to the radio access network device.
8 . The apparatus according to claim 7 , wherein the obtaining first indication information comprises: receiving the first indication information from the radio access network device; or obtaining the first indication information locally preconfigured by a remote device.
9 . The apparatus according to claim 7 , wherein the calculating a buffer status BS based on the splitting proportion indicated by the first indication information comprises: allocating all data volumes of the PDCP entity to the BS in the first BSR, and sending the first BSR to the radio access network device; allocating all data volumes of the PDCP entity to the BS in the second BSR and sending the second BSR to the radio access network device; or proportionately allocating the data volumes of the PDCP entity to the BS in the first BSR and to the BS in the second, wherein a range of the proportional allocation for the splitting proportion is greater than 0 and less than 1, and sending the first BSR and the second BSR to the radio access network device.
10 . The apparatus according to claim 7 , wherein the splitting proportion is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of a remote device.
11 . The apparatus according to claim 7 , wherein the first indication information further comprises a bearer identifier corresponding to the splitting proportion.
12 . The apparatus according to claim 7 , wherein, when executed, the instructions cause the apparatus to perform operations comprising: receiving second indication information from the network device, the second indication information instructing a remote device to schedule the Uu uplink resource and the sidelink resource.
13 . An apparatus comprising: at least one processor; and a memory storing instructions for execution by the at least one processor that, when executed, the instructions cause the apparatus to perform operations comprising: sending a first indication message to a remote device, the first indication message indicating a splitting proportion of a data volume of a packet data convergence protocol (PDCP) entity, wherein the splitting proportion comprises a data proportion of a data volume of the PDCP entity that is allocated to a first link and a data proportion of a data volume of the PDCP entity that is allocated to a second link, the first link providing for receipt by a radio access network device of uplink data transmitted by the remote device, and the second link providing for receipt by the radio access network device of the uplink data transmitted by the remote device by using a plurality of relay devices; and receiving a first buffer status report (BSR) and a second BSR sent by the remote device, the first BSR providing for requesting to schedule a Uu uplink resource, and the second BSR providing for requesting to schedule a sidelink resource.
14 . The apparatus according to claim 13 , wherein the splitting proportion is applicable to all data radio bearers (DRBs) of the remote device, and the PDCP entity is a PDCP entity of the DRB of the remote device.
15 . The apparatus according to claim 13 , wherein the first indication information further comprises a bearer identifier corresponding to the splitting proportion.
16 . The apparatus according to claim 13 , wherein, when executed, the instructions cause the apparatus to perform operations comprising: sending second indication information to the remote device, the second indication information instructing the remote device to schedule the Uu uplink resource and the sidelink resource.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2020/132966 filed on Nov. 30, 2020, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This disclosure relates to the communication field, and more specifically, to a data transmission method and an apparatus. BACKGROUND A user equipment to network (U2N) relay technology is a technology that can improve cell coverage. A U2N relay system includes a radio access network device, a relay device, and a remote device. The radio access network device communicates with the relay device through a Uu interface, and the relay device communicates with the remote device through a PC5 interface. The relay device may help the remote device access the radio access network device to obtain a service. For example, in downlink, the relay device obtains data of the remote device from the radio access network device, and forwards the data of the remote device to the remote device. Uplink data transmission is also similar. To be specific, after obtaining data from the remote device, the relay device forwards the data to the radio access network device. In addition to improving network coverage based on the U2N relay, to further improve downlink transmission efficiency of the remote device, it may be further considered that a plurality of links simultaneously serve the remote device. For example, the remote device establishes, to the radio access network device by using a plurality of relay devices, indirect links that include only sidelinks, or the remote device establishes a plurality of indirect links to the radio access network device by using a plurality of relay devices, and establishes a direct link to the radio access network device. However, when the remote device sends data to the radio access network device through at least two links, transmission efficiency is low. SUMMARY This disclosure provides a data transmission method and an apparatus to improve uplink data transmission efficiency. According to a first aspect, a data transmission method is provided. The method includes: A remote device determines a sidelink multicast identifier, where the sidelink multicast identifier identifies multicast between the remote device and a plurality of relay devices; and the remote device sends uplink data to the plurality of relay devices in a multicast manner based on the sidelink multicast identifier, where the uplink data is data sent by the remote device to a radio access network device. In this embodiment, the remote device first determines the multicast identifier, and sends the uplink data to the radio access network in the multicast manner based on the multicast identifier by using the plurality of relay devices. Therefore, reliability of sending the uplink data by the remote device by using the plurality of relay devices is improved, and uplink data transmission efficiency is also improved. With reference to the first aspect, in a first possible implementation of the first aspect, the method further includes: The remote device sends a first message to the plurality of relay devices, where the first message includes the sidelink multicast identifier. With reference to the first possible implementation of the first aspect, in a second possible implementation of the first aspect, the first message further includes sidelink bearer indication information and a first Uu bearer identifier, the first Uu bearer identifier identifies a first data radio bearer DRB between the remote device and the radio access network device, the sidelink bearer indication information indicates a sidelink multicast bearer, and there is a correspondence between the sidelink multicast bearer and the first DRB. In this embodiment, the remote device sends, to the relay device, the sidelink bearer indication information and the first Uu bearer identifier that has a correspondence with the sidelink bearer indication information, so that the relay device can learn of a specific sidelink multicast bearer from which the uplink data sent by the remote device is received, to improve uplink data transmission efficiency. With reference to any one of the first aspect or the first and the second possible implementations of the first aspect, in a third possible implementation of the first aspect, the method further includes: The remote device receives a configuration message from the radio access network device, where the configuration message includes a sidelink bearer configuration, the sidelink bearer configuration is for configuring a sidelink multicast bearer between the remote device and the plurality of relay devices, and that the remote device determines the sidelink multicast identifier includes determining the sidelink multicast identifier based on the configuration message. With reference to the third possible implementation of the first aspect, in a fourth possible implementation of the first aspect,