Sidelink Relay Link Management and Recovery
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Solution Overview
Problem
Existing communication systems face challenges in efficiently managing and recovering from sidelink radio link failures, particularly in scenarios where the link management on one link is not visible to another link, leading to delayed recovery and service continuity issues.
Innovation Solution
The proposed method involves detecting sidelink radio link failures and initiating a reestablishment procedure by selecting a candidate node, either a relay node or a network node, and configuring timers for connection reestablishment. This includes starting a first timer upon selecting the candidate node and potentially starting a second timer using a third timer value if included in the configuration information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If link management is performed independently on each link, then device complexity is reduced, but service continuity deteriorates due to invisible link failures
Solution Approach 1:
The patent merges link management functions across multiple links by having the second WTRU monitor both the first link (between first WTRU and second WTRU) and the second link (between second WTRU and network node). This unified monitoring approach allows the system to detect failures on either link and initiate recovery procedures, ensuring service continuity while maintaining manageable complexity through a coordinated rather than fully distributed approach.
2Reliability
If recovery procedures are initiated immediately upon failure detection, then service continuity is improved, but power consumption increases due to frequent timer operations
Solution Approach 1:
The patent implements dynamic timer management where the second WTRU selectively starts and stops timers based on the detected failure type. When a failure is detected on the first link, the second WTRU starts a first timer and stops a second timer. When failure is detected on the second link, the opposite occurs. This dynamic adaptation allows the system to respond appropriately to different failure scenarios while minimizing unnecessary timer operations and associated power consumption.
3Measurement precision
If multiple timers are managed for different failure scenarios, then recovery accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific timer management rules to specific failure scenarios. The first timer is dedicated to monitoring recovery from first link failures, while the second timer monitors recovery from second link failures. Each timer has its own start/stop conditions tailored to the specific failure type it monitors. This localized approach allows precise failure detection and recovery timing for each scenario while keeping the overall system manageable through clear, scenario-specific rules rather than a complex unified timer system.
Data Source
AI summary
A method may include detecting a sidelink radio link failure and, in response, starting a first timer based on a first timer value associated with selection of a candidate node. The candidate node is a relay node or a network node. The relay node is selected for a connection reestablishment and configuration information is received that at least includes a second timer value associated with a second timer, which is associated with the connection reestablishment. The first timer is stopped upon selecting the candidate node. If the configuration information includes a third timer value associated with the connection reestablishment, the second timer is started using the third timer value upon selecting the candidate node. If the configuration information does not include the third timer value, the second timer is started using the second timer value upon selecting the candidate node. A reestablishment request message is then sent.