Sidelink RRC Connection Release via PC5 Link Identifier
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in identifying and managing sidelink radio resource control (RRC) connections when radio link failures (RLF) occur, especially in scenarios with multiple PC5 RRC connections, as existing methods struggle to uniquely identify the affected link, leading to inefficient resource management and potential communication disruptions.
Innovation Solution
A method is introduced where a user equipment (UE) establishes multiple PC5 RRC connections and releases the connection associated with a declared sidelink RLF, using a unique PC5 link identifier to indicate the affected RRC connection, allowing for precise identification and management of RLFs, and transmitting relevant information to the base station or higher layers to facilitate resource release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PC5 RRC connections are established for sidelink communication, then communication reliability and capacity are improved, but identification and management of affected links during radio link failure becomes complex and error-prone
Solution Approach 1:
The patent segments the identification of PC5 RRC connections by introducing unique PC5 link identifiers that separately identify each sidelink connection. This allows the system to manage multiple connections independently, tracking each with its own identifier while maintaining overall system reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism - the unique PC5 link identifier - that mediates between the multiple PC5 RRC connections and the failure management system. This intermediary enables precise identification of affected links during failures without requiring complex management of all connections.
2Measurement precision
If unique PC5 link identifiers are introduced for each sidelink connection, then precise identification of affected links during RLF is achieved, but signaling overhead and message complexity increase
Solution Approach 1:
The patent applies preliminary action by establishing unique PC5 link identifiers during the initial connection setup phase. This allows precise identification to be ready in advance, eliminating the need for complex identification procedures when failures occur, thereby reducing actual signaling overhead during critical events.
3Productivity
If RRC connections are released upon sidelink RLF declaration, then resource management efficiency is improved, but communication disruptions may occur if identification is inaccurate
Solution Approach 1:
The patent segments the RRC connection management by allowing selective release of individual PC5 RRC connections based on unique identifier matching. When a sidelink RLF is detected, only the specific connection with the matching PC5 link identifier is released, while other connections remain intact, ensuring both efficient resource management and communication continuity.
Data Source
AI summary
A method of operating a first user equipment (UE) in a wireless communication system is disclosed. The method includes establishing two or more PC5 radio resource control (RRC) connections with a second UE by the first UE, and releasing an RRC connection for which sidelink radio link failure (SL RLF) has been declared among the two or more PC5 RRC connections by the first UE. There is a PC5 unicast link associated with the PC5 RRC connection, and the PC5 unicast link for which the SL RLF has been declared and the PC5 RRC connection has been released is indicated by a PC5 link identifier (ID).