Sidelink Sync Signal ID Allocation for GNSS-UE Interference
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Solution Overview
Problem
Current wireless communication systems face challenges in transmitting and receiving synchronization signals effectively, especially when a satellite signal is available for synchronization, leading to potential interference with adjacent user equipment (UE) and inaccurate synchronization.
Innovation Solution
A method for transmitting a sidelink synchronization signal (SLSS) by a user equipment (UE) that has acquired synchronization from a global navigation satellite system (GNSS), using an SLSS identifier (ID) selected from the same set as used by a UE synchronized with a base station (BS), and transmitting the SLSS in the same resources as the BS-synchronized UE, with priority given to the GNSS signal if not received from the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE uses GNSS signal for synchronization, then synchronization accuracy is improved, but interference with adjacent UEs increases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of GNSS-based UEs from BS-based UEs through separate SLSS ID allocation. GNSS-based UEs are assigned IDs from a dedicated set (e.g., {168, 169, ..., 335}) while BS-based UEs use other IDs, creating locally optimized synchronization identifiers for different synchronization sources to minimize interference.
Solution Approach 2:
The patent segments the SLSS ID space into different sets based on synchronization source type. By dividing the complete SLSS ID set into GNSS-based IDs and BS-based IDs, the system prevents confusion and interference between UEs using different synchronization references, allowing each group to operate with dedicated identifier resources.
2Reliability
If GNSS signal is prioritized for synchronization, then synchronization reliability is improved, but complexity in determining synchronization source increases
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously determine their own synchronization source classification. Each UE automatically identifies whether it should use GNSS or BS synchronization based on signal availability and configuration, without requiring manual setup or complex network coordination, thereby achieving reliable synchronization with minimal operational complexity.
Solution Approach 2:
The patent uses parameter changes by dynamically selecting between different SLSS ID sets based on synchronization source availability. When GNSS is available, the UE transitions to using GNSS-specific IDs; when BS synchronization is used, it switches to BS-specific IDs. This parameter switching mechanism provides reliable synchronization while maintaining simple implementation through straightforward conditional logic.
Data Source
AI summary
An embodiment of the present invention relates to a method in which a terminal transmits a sidelink synchronization signal (SLSS) in a wireless communication system, the method including: selecting an SLSS ID by means of a terminal which directly receives a signal from Global Navigation Satellite Systems (GNSS) to obtain synchronization; and transmitting the SLSS generated on the basis of the selected SLSS ID, wherein the selected SLSS ID is selected from an SLSS ID set, which is identical to one used when a terminal, which directly receives a synchronization signal from a base station and selects a base station timing as synchronization, transmits the SLSS.