Sidelink COT Sharing in Unlicensed Bands for Low-Latency V2X
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Solution Overview
Problem
The increasing demand for mobile broadband communication and V2X services requires efficient sidelink communication solutions to manage channel occupancy time sharing and reduce latency in unlicensed bands, particularly for vehicle-to-everything (V2X) applications.
Innovation Solution
A method and device for sidelink communication that involves obtaining channel occupancy time (COT) sharing information and transmitting sidelink control information (SCI) through physical sidelink control and sharing channels to manage channel access in unlicensed bands, utilizing COT sharing information related to primary and secondary channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink communication is performed in unlicensed bands without COT sharing information, then channel access procedures are simpler, but channel occupancy time management is inefficient and latency increases
Solution Approach 1:
The patent introduces COT sharing information as an intermediary element that mediates between multiple devices accessing the unlicensed band. This information, transmitted through SCI on PSSCH, enables coordinated channel access by indicating which device holds channel occupancy rights and for how long, thereby improving channel access efficiency without requiring complex contention resolution protocols
Solution Approach 2:
The patent implements preliminary action by having devices transmit COT sharing information in advance before actual data transmission. The SCI messages contain pre-negotiated channel occupancy time allocations, allowing devices to prepare for efficient channel access without real-time contention, thus reducing latency and improving productivity
2Measurement precision
If COT sharing information is transmitted through multiple channels, then channel occupancy management is more accurate, but communication overhead increases
Solution Approach 1:
The patent extracts COT sharing information from general control messaging and places it specifically in the second SCI transmitted on PSSCH. This extraction allows precise channel occupancy management to be achieved through a dedicated information field rather than through multiple separate control channels, thereby maintaining measurement precision while reducing overall communication overhead
3Loss of time
If traditional channel access procedures are used in unlicensed bands, then protocol simplicity is maintained, but latency in V2X applications increases
Solution Approach 1:
The patent applies preliminary action by having devices exchange COT sharing information and establish channel occupancy arrangements before actual V2X data transmission begins. This pre-coordination eliminates real-time contention and waiting delays, significantly reducing latency for time-critical V2X applications while maintaining operational simplicity through standardized SCI messaging formats
Data Source
AI summary
A method performed by means of a first device in a wireless communication system, and a device for supporting same are provided. The method comprises the steps of: acquiring channel occupancy time (COT) sharing information; transmitting, through a physical sidelink control channel (PSCCH), second sidelink control information (SCI) and first SCI for the scheduling of a physical sidelink shared channel (PSSCH); and transmitting, through the PSSCH on a primary channel, the second SCI including the COT sharing information, wherein the COT sharing information can be COT sharing information about the primary channel and/or a secondary channel.