U2U Sidelink Bearer Mapping for SRAP Data Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of implementing bearer multiplexing and demultiplexing functions of the sidelink relay adaptation protocol (SRAP) layer in user equipment-to-user equipment (U2U) relay scenarios, where no central node is involved to determine a unified bearer identifier or mapping relationship between terminal devices, leading to incorrect data delivery.
Innovation Solution
A communication method where a first terminal device determines a radio bearer identifier based on sidelink radio bearer (SLRB) configuration information and sends this identifier along with associated configuration information to relay and second terminal devices, establishing an association relationship to enable correct data delivery through the SRAP layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a network device is used to determine bearer identifier and configure mapping relationship, then bearer multiplexing and demultiplexing functions can be implemented, but the scenario requires network involvement which is not available in U2U relay
Solution Approach 1:
The first terminal device autonomously determines the radio bearer identifier based on SLRB configuration information and unilaterally sends the association relationship to the relay terminal device and second terminal device. This self-service mechanism eliminates the need for network device involvement while still achieving reliable bearer multiplexing and demultiplexing functions in U2U relay scenarios.
2Ease of operation
If no network device is involved in U2U relay, then direct terminal-to-terminal communication is achieved, but mapping relationship between bearer identifier and RLC channel cannot be determined
Solution Approach 1:
The first terminal device performs preliminary action by determining the radio bearer identifier and sending the complete association relationship (including mapping information) to the relay terminal device and second terminal device before data transmission begins. This ensures that all necessary mapping relationship information is established in advance, preventing information loss during direct terminal communication.
3Reliability
If radio bearer identifier and configuration information are sent to relay and second terminal devices, then correct data delivery is enabled, but additional signaling overhead is introduced
Solution Approach 1:
The patent merges the radio bearer identifier determination and configuration information transmission into a single integrated process. The first terminal device determines the identifier based on SLRB configuration information and sends both the identifier and associated configuration information together in one signaling message, reducing the number of separate signaling exchanges while ensuring accurate data delivery.
Data Source
AI summary
A communication method and apparatus are provided, including a first terminal device determines a first identifier based on sidelink radio bearer SLRB configuration information, where the SLRB configuration information indicates an SLRB between the first terminal device and a second terminal device, the first identifier is a radio bearer identifier, and the radio bearer identifier indicates a radio bearer between the first terminal device and the second terminal device. The first terminal device sends first information to a relay terminal device, and sends the first information to the second terminal device via the relay terminal device, where the first information includes one or more first identifiers and SLRB configuration information associated with the first identifier, and different first identifiers are associated with different SLRB configuration information.