Sidelink Synchronization Across Multiple Channels to Reduce UE Interference
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Solution Overview
Problem
Sensing user equipment (UE) operating on multiple channels often fails to maintain synchronization, leading to interference between different UEs due to lack of effective synchronization mechanisms.
Innovation Solution
A communication method involving terminal devices that receive and send sidelink synchronization signals based on priority groups and signal strength to synchronize UEs across multiple channels, reducing interference by selecting and sending synchronization signals with higher priority and power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensing UE operates on multiple channels, then the sensing UE can perform sensing on more targets, but the sensing UE cannot maintain synchronization with sensing UEs on each channel
Solution Approach 1:
The patent divides the frequency domain into multiple frequency domain units and assigns different sidelink synchronization signals to different frequency domain units. This segmentation allows the sensing UE to maintain separate synchronization relationships for each channel while operating on multiple channels simultaneously, resolving the contradiction between multi-channel capability and synchronization reliability.
Solution Approach 2:
The patent introduces a frequency domain dimension for synchronization signal distribution. By transmitting different synchronization signals in different frequency domain units rather than relying on a single time-domain synchronization mechanism, the system enables multi-channel operation while maintaining synchronization across all channels through frequency-domain diversity.
2Ease of operation
If sensing UEs do not maintain synchronization, then there is no constraint on channel usage, but interference occurs between sensing UEs on the same channel
Solution Approach 1:
The patent segments the frequency domain into multiple frequency domain units and assigns different synchronization signals to each unit. This allows sensing UEs to access channels flexibly while maintaining synchronization through frequency-domain separation, thereby reducing interference between UEs operating on the same channel.
Solution Approach 2:
The sidelink synchronization signal acts as an intermediary mechanism that mediates between channel access flexibility and interference reduction. By using synchronization signals transmitted in different frequency domain units, the system enables UEs to access channels freely while the synchronization mechanism coordinates their operations to minimize interference.
3Device complexity
If a sensing UE uses a single synchronization signal for multiple channels, then the system complexity is reduced, but the UE cannot be synchronized with all sensing UEs on different channels
Solution Approach 1:
The patent makes the sidelink synchronization signal universal across multiple frequency domain units. The same synchronization signal structure is reused in different frequency domain units, allowing a single synchronization mechanism to serve multiple channels simultaneously. This maintains system simplicity while achieving broad synchronization coverage across all channels.
Solution Approach 2:
The patent extends the synchronization signal from a single time-domain entity to a frequency-domain distributed structure. By transmitting synchronization signals across multiple frequency domain units, the system achieves broader synchronization coverage without significantly increasing system complexity, as the same signal structure is reused in different frequency locations.
Data Source
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AI summary
This application relates to a communication method and apparatus. A first terminal device receives a first sidelink synchronization signal from a second terminal device in M frequency domain units, where the M frequency domain units are a part of all frequency domain units supported by the first terminal device, and M is a positive integer. When a first condition is satisfied, the first terminal device selects the second terminal device as a synchronization source. The first terminal device sends a second sidelink synchronization signal based on the first sidelink synchronization signal. According to embodiments of this application, all terminal devices on different channels can be synchronized with the second terminal device, so that terminal devices on a plurality of channels are synchronized, and interference between terminal devices is reduced.