PC5 Relay Link Release Using AS-Recognizable Messages
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Solution Overview
Problem
The challenge in wireless communication systems is the efficient management of link release in UE-to-UE relays, particularly in scenarios where the relay UE does not recognize PC5-S release messages, leading to unnecessary maintenance of PC5 links.
Innovation Solution
A method and device for operating UE-to-UE relays that involve establishing and releasing PC5 links based on messages recognizable at the access stratum layer of the relay UE, including the release of bearers and measurement settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay UE does not recognize PC5-S release messages, then the relay UE can maintain PC5 links for potential future use, but this leads to unnecessary maintenance of connections and wasted resources
Solution Approach 1:
The patent changes the parameter of message recognition capability at the access stratum layer. By configuring the relay UE to recognize and process PC5-S release messages at the AS layer, the system transitions from a state where links are maintained indefinitely to one where links are properly released when no longer needed, resolving the contradiction between reliability and energy waste.
2Stability of the object's composition
If the relay UE maintains PC5 links without proper release mechanism, then connection stability is improved, but device complexity increases due to unnecessary link management
Solution Approach 1:
The patent introduces a feedback mechanism through PC5-S release messages that provide information about link status to the relay UE. This feedback allows the relay UE to automatically manage link release based on actual communication needs, simplifying link management complexity while maintaining connection stability through proper release protocols.
3Reliability
If PC5 links are established without proper release handling, then communication availability is improved, but resource management efficiency deteriorates
Solution Approach 1:
The patent implements preliminary action by establishing clear release procedures and message handling mechanisms before link establishment. The relay UE is pre-configured to recognize and process PC5-S release messages, ensuring that resources are efficiently allocated and released when no longer needed, thereby improving resource management efficiency while maintaining communication availability.
Data Source
AI summary
According to one embodiment, a method for operating relay user equipment (UE) related to UE-to-UE relay in a wireless communication system comprises: by the relay UE, establishing a first PC5 link and a second PC5 link with a first UE and a second UE, respectively; by the relay UE, delivering a message related to establishing an end-to-end PC5 link transmitted and received between the first UE and the second UE; by the relay UE, receiving, from the first UE, a predetermined message related to releasing the end-to-end PC5 link between the first UE and the second UE; and by the relay UE, releasing the first PC5 link and the second PC5 link, wherein the predetermined message comprises a value that can be recognized by an Access Stratum (AS) layer of the relay UE.