UE-to-UE Sidelink Relay RLC Channel Release Triggering
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing Radio Link Control (RLC) channels in UE-to-UE relay communications, particularly in evolving 5G networks, which impact the performance of voice over IP and multimedia services.
Innovation Solution
A method and apparatus for triggering sidelink RLC channel release in UE-to-UE relay communication, involving the establishment of an end-to-end Sidelink Data Radio Bearer and associating it with PC5 Relay RLC channels, followed by a modification to support the relay communication and subsequent release of the first PC5 Relay RLC channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PC5 Relay RLC channels are established for UE-to-UE relay communication, then the reliability and performance of voice over IP and multimedia services are improved, but the device complexity and resource management overhead increase
Solution Approach 1:
The patent segments the RLC channel management into distinct phases: initial establishment phase where multiple PC5 Relay RLC channels are created for different data radio bearers, and a subsequent release phase where channels are systematically cleared. This segmentation allows reliable multi-channel operation when needed while providing a clean state transition to reduce complexity afterward.
Solution Approach 2:
The patent implements preliminary action by establishing a trigger mechanism that initiates the RLC channel release process based on predefined conditions (such as completion of relay communication or configuration changes). This preliminary trigger ensures that channels are released proactively before they become obsolete, preventing resource leakage and reducing management complexity without affecting ongoing reliable communication.
2Stability of the object's composition
If RLC channels are maintained for extended periods in relay communication, then the stability of connection is improved, but the loss of time for channel release and resource reallocation increases
Solution Approach 1:
The patent implements feedback mechanisms through trigger conditions that monitor the state of relay communication and RLC channel usage. When specific conditions are met (such as communication completion or reconfiguration events), the trigger initiates the channel release process. This feedback-based approach ensures channels remain stable during active communication while enabling timely release when no longer needed, minimizing time loss without compromising connection stability.
3Adaptability or versatility
If dynamic modification of end-to-end SL DRB association with PC5 Relay RLC channels is performed, then the adaptability of the communication system is improved, but the difficulty of detecting and measuring channel state increases
Solution Approach 1:
The patent introduces an intermediary trigger mechanism that mediates between the dynamic modification of DRB-RLC channel associations and the underlying channel state. The trigger acts as a mediator that detects high-level conditions (such as association changes or communication completion) and automatically initiates appropriate channel release actions, simplifying the detection and measurement burden while maintaining full adaptability of the system.
Data Source
AI summary
A method and device for a first end User Equipment (UE) are disclosed. The first end UE establishes a PC5 connection with a relay UE for supporting a UE-to-UE relay communication between the first end UE and a second end UE via the relay UE. The first end UE establishes an end-to-end Sidelink (SL) Data Radio Bearer (DRB) and associates the end-to-end SL DRB with a first PC5 Relay Radio Link Control (RLC) channel for supporting the UE-to-UE relay communication. In addition, the first end UE modifies the end-to-end SL DRB to associate it with a second PC5 Relay RLC channel for supporting the UE-to-UE relay communication. Furthermore, the first end UE, in response to the modification of the end-to-end SL DRB, performs PC5 Relay RLC channel release for the first PC5 Relay RLC channel.