Sidelink Group Synchronization Switching with Timing Assistance
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Solution Overview
Problem
In sidelink communications, particularly in scenarios where a UE changes its synchronization source, there are issues such as communication disruption, latency in discovering a new synchronization source, and generation of redundant synchronization sources, leading to prolonged communication disruptions among a group of UEs.
Innovation Solution
A UE acting as a synchronization reference transmits timing assistance information to inform other UEs about a second synchronization source before switching, allowing all UEs in the group to switch simultaneously, thereby preventing communication disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE changes synchronization source without notifying other UEs, then the UE can switch to a higher priority synchronization source, but communication disruption occurs and latency increases
Solution Approach 1:
The patent applies preliminary action by having the master UE transmit timing assistance information to member UEs before actually switching synchronization sources. This allows member UEs to prepare for the upcoming switch by adjusting their internal timing based on the provided assistance information, thereby reducing switching latency and avoiding communication disruption when the synchronization source change occurs.
2Adaptability or versatility
If a UE changes synchronization source without coordinating with the group, then the UE can adapt to better synchronization conditions, but redundant synchronization sources are generated
Solution Approach 1:
The patent implements feedback mechanisms where the master UE monitors synchronization conditions and notifies member UEs of synchronization source changes. Member UEs also provide feedback about their synchronization status. This coordinated feedback loop ensures that only one synchronization source is active at a time, preventing redundant sources while maintaining adaptability to better synchronization conditions.
3Ease of operation
If UEs independently discover new synchronization sources, then each UE can optimize its own synchronization, but communication disruption occurs among the group
Solution Approach 1:
The patent merges individual UE synchronization operations into a coordinated group operation. The master UE aggregates synchronization information from all member UEs and makes a unified decision about source switching. This combining approach ensures that all UEs switch to the same synchronization source simultaneously, maintaining group communication reliability while still allowing each UE to benefit from optimized synchronization.
Data Source
AI summary
A group of user equipment (UEs) for sidelink communications includes a master UE and member UEs. Any of the UE may measure one or more sidelink synchronization signal sources during a configured measurement gap within the sidelink communications with the group of UEs. A member UE may transmit an alternative synchronization source report indicating detected synchronization sources to the master UE. The master UE is configured to determine to change from a first synchronization source to a second synchronization source for sidelink communications with a group of UEs. The master UE is configured to transmit, to the group of UEs, timing assistance information for synchronization with the second synchronization source. The UEs are configured to switch sidelink communications with the group of UEs to the second synchronization source.