Sidelink CPE Start Position Selection for Low-Latency V2X
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Solution Overview
Problem
The increasing demand for mobile broadband communication and the need for enhanced reliability and low latency in wireless communication systems, particularly in sidelink (SL) communication, are not adequately addressed by existing Radio Access Technologies (RATs, especially in scenarios involving vehicle-to-everything (V2X) communication, which face challenges such as channel sensing failures leading to increased delay times.
Innovation Solution
A method and device for performing wireless communication that involves obtaining and selecting a cyclic prefix extension (CPE) starting position based on the priority of sidelink (SL) transmission, enabling efficient SL transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple candidate CPE starting positions are considered to optimize SL transmission, then transmission reliability and efficiency are improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate CPE starting positions and their associated priorities before actual transmission occurs. The higher layer signals the UE with configured CPE starting position information in advance, allowing the UE to select the appropriate position based on transmission priority without complex real-time calculations, thus improving reliability while managing complexity
Solution Approach 2:
The patent utilizes parameter changes by dynamically selecting different CPE starting positions based on transmission priority levels. Different priorities map to different starting positions within the slot, allowing the system to adjust temporal parameters according to service requirements. This resolves the contradiction by providing multiple optimized positions for high-priority transmissions while maintaining a structured selection process
2Loss of time
If CPE starting position is selected based on transmission priority, then latency is reduced for high-priority transmissions, but channel access efficiency may deteriorate
Solution Approach 1:
The patent applies local quality by assigning different CPE starting positions to different transmission priorities within the same slot structure. High-priority transmissions start at earlier positions while lower-priority transmissions use later positions, creating localized optimization for each priority level. This resolves the contradiction by ensuring low latency for critical transmissions without completely blocking other transmissions, as each priority level has its designated starting position
Solution Approach 2:
The patent implements dynamics by making the CPE starting position dependent on transmission priority rather than using a fixed position for all transmissions. The system dynamically adapts the starting position based on the priority level of each SL transmission, allowing flexible resource allocation that balances latency requirements with overall channel access efficiency
Data Source
AI summary
Provided are a method for a first device to communicate wirelessly and a device for supporting same. The method may comprise the steps of: acquiring information related to a plurality of cyclic prefix extension (CPE) starting candidate positions; selecting a CPE starting position from among the plurality of CPE starting candidate positions on the basis of the priority of sidelink (SL) transmission; and transmitting SL on the basis of the CPE starting position.