L2 Relay RLC Channel Mapping for Sidelink and Backhaul Links
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Solution Overview
Problem
There is no clear solution in existing technologies for implementing the mapping between Radio Link Control (RLC) channels or RLC layer logical channels in the scenario where a UE serves as an L2 relay.
Innovation Solution
A method for determining a mapping relationship between a sidelink interface and a backhaul link for RLC channels or RLC layer logical channels, involving configuration information exchange and quality of service parameter division, to ensure proper data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE serves as an L2 relay to extend network coverage, then the network coverage is extended and communication reliability is improved, but there is no clear solution for implementing the mapping between bearers or RLC channels, causing operational failures
Solution Approach 1:
The patent introduces a mapping relationship as an intermediary mechanism between the sidelink interface and backhaul link. This mapping relationship acts as a mediator that translates and coordinates the mapping between RLC channels on the sidelink interface and bearers on the backhaul link, enabling the L2 relay to operate correctly without direct configuration of complex mapping rules.
2Device complexity
If L2 relay is implemented without clear mapping solutions, then device complexity is reduced, but the normal working of L2 relay cannot be ensured
Solution Approach 1:
The patent segments the mapping implementation into two distinct parts: (1) mapping between RLC channels on the sidelink interface, and (2) mapping between bearers on the backhaul link. By dividing the complex end-to-end mapping into these two manageable segments, the system reduces configuration complexity while ensuring reliable operation through independent optimization of each segment.
3Measurement precision
If detailed mapping configurations are implemented for RLC channels and bearers, then mapping accuracy is improved, but configuration complexity and information overhead increase
Solution Approach 1:
The patent applies partial action by implementing mapping only at the necessary interfaces (sidelink RLC channel mapping and backhaul bearer mapping) rather than configuring complete end-to-end mapping details. This partial mapping approach achieves sufficient accuracy for relay operation without the overhead of detailed comprehensive mapping configurations.
Data Source
AI summary
An information transmission method, a terminal and a network device are provides. The method is applied to a second terminal and includes: determining a mapping relationship between a target object of a sidelink interface and a target object of a backhaul link; performing a relay function according to the mapping relationship; wherein the target object is one of a bearer, an RLC channel and an RLC layer logical channel; the second terminal is a relay terminal corresponding to a first terminal; the target object of the sidelink interface is a target object of a sidelink interface between the first terminal and the second terminal; the target object of the backhaul link is a target object for carrying data and/or control information of the first terminal between the second terminal and a network device.