Sidelink Sync Signal Index for Resource Pool Determination
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Solution Overview
Problem
In scenarios where sensing UEs have limited functional modules, such as in home or industrial applications, they cannot synchronize with communication UEs due to the absence of channel encoding and demodulation modules, leading to inconsistent resource pool determinations and potential resource conflicts.
Innovation Solution
UEs determine resource pool locations based on indices of sidelink synchronization signals, eliminating the need for PSBCH parsing and reducing the risk of resource conflicts by using existing S-SSS and S-PSS sequences for synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensing UEs use simple radar sensing modules without channel encoding and decoding modules, then device complexity and cost are reduced, but synchronization capability with communication UEs deteriorates
Solution Approach 1:
The patent extracts the essential synchronization information (index of sidelink synchronization signal) from the complex PSBCH structure, allowing sensing UEs to achieve synchronization without needing channel encoding and decoding modules. This separates the critical synchronization function from the complex communication protocol stack.
Solution Approach 2:
The patent uses existing S-SSS and S-PSS sequences that are already present in the sidelink synchronization signal structure to carry index information, rather than requiring sensing UEs to implement full PSBCH processing. This leverages existing signal structures for dual purposes.
2Device complexity
If sensing UEs cannot identify S-SSB or PSBCH from communication UEs, then device complexity is reduced, but resource pool determination consistency deteriorates
Solution Approach 1:
The patent introduces the index of the sidelink synchronization signal as an intermediary parameter that bridges the gap between sensing and communication UEs. This index can be determined from existing sequences without requiring PSBCH identification, ensuring both UE types can consistently determine resource pool locations.
Solution Approach 2:
The patent changes the synchronization approach from relying on PSBCH content (which requires decoding) to relying on the index of the sidelink synchronization signal itself (which can be determined from sequences). This parameter change makes synchronization accessible to simple radar sensing modules.
3Ease of operation
If different UE types determine resource pool locations independently without synchronization, then operational independence is maintained, but resource conflict probability increases
Solution Approach 1:
The patent establishes a feedback mechanism where the index of the sidelink synchronization signal provides information about resource pool location to both sensing and communication UEs. This shared reference ensures consistent resource pool determination while maintaining operational independence.
Data Source
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AI summary
This application relates to a resource pool determining method and an apparatus. A first terminal device receives a first sidelink synchronization signal in a first time domain unit, where the first sidelink synchronization signal includes a first sequence, and the first sequence indicates an index of the first sidelink synchronization signal. The first terminal device determines a time domain position of a first resource pool based on the index of the first sidelink synchronization signal. The index of the first sidelink synchronization signal is determined based on the first sequence included in the first sidelink synchronization signal, and both a terminal device of a sensing type and a terminal device of a communication type can identify the first sequence. In this way, terminal devices may not need to implement synchronization based on a PSBCH, but can determine time domain positions of respective resource pools based on sequences included in received sidelink synchronization signals. A different type of terminal device does not mistakenly use a resource in a resource pool configured for another type of terminal device. This reduces a probability of a resource conflict.