OOC V2X Synchronization Using Peer Timing Recovery
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Solution Overview
Problem
Existing technologies struggle to maintain accurate synchronization in out of coverage (OOC) vehicle-to-everything (V2X) communications when Global Navigation Satellite System (GNSS) synchronization signals are lost, leading to potential interference and degradation in communication performance.
Innovation Solution
UEs in OOC maintain synchronization by receiving timing information from multiple synchronized peers, applying weighted time averaging based on reliability factors and higher layer parameters to adjust transmission timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs rely on GNSS synchronization signals for V2X communication, then timing synchronization is maintained under normal conditions, but communication performance degrades when GNSS signals are lost
Solution Approach 1:
The patent introduces synchronized peer UEs as intermediary sources to provide timing information when GNSS synchronization is lost. These peer UEs act as mediators between the lost GNSS reference and the UE needing synchronization, allowing timing recovery through received packets from synchronized peers without directly relying on the unavailable GNSS signal.
Solution Approach 2:
The patent implements feedback mechanisms where UEs monitor their synchronization status by detecting timing uncertainty values and error values from received packets. When timing uncertainty exceeds thresholds, the system triggers synchronization recovery procedures, creating a closed-loop feedback system that continuously adapts to synchronization conditions and maintains communication reliability.
2Productivity
If UEs perform timing adjustments without synchronization, then communication can continue, but timing accuracy deteriorates leading to interference
Solution Approach 1:
The patent applies partial action by implementing receive-only periods during which UEs temporarily suspend transmission to focus on receiving and measuring timing information from synchronized peers. This partial suspension of normal operation allows the system to gather sufficient timing data to make accurate adjustments when resuming communication, balancing continuity with accuracy.
Solution Approach 2:
The patent performs preliminary timing measurements and calculations during receive-only periods before resuming normal transmission. By pre-calculating timing adjustments based on received packet timing information and timing uncertainty values, the system ensures that when communication resumes, timing accuracy is already optimized, preventing interference while maintaining continuity.
3Measurement precision
If UEs enter receive-only period to recover synchronization, then timing accuracy is improved, but communication duration is reduced
Solution Approach 1:
The patent implements periodic receive-only periods rather than continuous operation, allowing UEs to periodically recover synchronization while maintaining communication during non-receive periods. This periodic approach balances the need for timing accuracy with the need for continuous communication, ensuring that synchronization is maintained without prolonged interruptions to service.
Data Source
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AI summary
Aspects directed towards synchronizing out of coverage (OOC) vehicle-to- everything (V2X) communications are disclosed. In one example, a scheduled entity detects a loss of a synchronization signal associated with a V2X communication by detecting when a timing uncertainty value or error value is greater than a threshold value. Packet timing information is then received in response to the loss of the synchronization signal from at least one user equipment (UE) synchronized with the synchronization signal. The scheduled entity then maintains the V2X communication by performing a timing adjustment based on the packet timing information.