Semi-Static Sidelink Channel Access for Interference-Free Occupancy
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Solution Overview
Problem
There is a need for efficient channel occupancy management in semi-static mode sidelink channel access in wireless communication systems, particularly in unlicensed or shared spectrum, to ensure reliable and coordinated communication between user equipment (UE) and base stations, ensuring the absence of other radio access technologies (RAT) to avoid interference.
Innovation Solution
A UE is configured with semi-static mode SL channel access parameters, including an indication of the absence of other RAT, and performs channel sensing and access procedures to initiate channel occupancy, with specific configurations for channel access and transmission durations, ensuring coordinated and interference-free communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs channel sensing and access procedures in unlicensed or shared spectrum, then channel occupancy can be initiated for reliable communication, but interference from other radio access technologies may occur
Solution Approach 1:
The UE performs channel sensing procedures before initiating channel occupancy to detect the presence of other RAT. This preliminary detection action allows the UE to determine whether the channel is clear of other radio access technologies before proceeding with transmission, thereby preventing interference while maintaining communication reliability
2Stability of the object's composition
If a UE determines channel occupancy duration and performs SL channel access procedures, then coordinated communication is achieved, but channel access time and complexity increase
Solution Approach 1:
The channel access procedure is divided into distinct segments: channel sensing phase, decision phase, and transmission phase. The UE segments the period into channel occupancy duration and idle duration, allowing systematic execution of access procedures while maintaining coordination. This segmentation enables the UE to methodically determine occupancy duration and perform access procedures without unnecessary delays
3Object-affected harmful factors
If a UE performs sensing procedures to ensure absence of other RAT, then interference is avoided, but detection complexity and processing requirements increase
Solution Approach 1:
The sensing procedure extracts only the critical information needed to detect other RAT presence from the channel environment. The UE focuses on detecting specific signals or patterns that indicate other radio access technologies rather than analyzing all channel characteristics, thereby reducing detection complexity while maintaining effective interference avoidance
Data Source
AI summary
Methods and apparatuses for initiating channel occupancy in a semi-static mode SL channel access in a wireless communication system. A method of a user equipment (UE) includes receiving, from a higher layer, an indication on a semi-static mode SL channel access, receiving a set of configurations for the semi-static mode SL channel access, including a duration of a period and determining a first portion of the period as a channel occupancy associated with the period. The method further includes determining a second portion of the period as an idle duration associated with the period, performing a SL channel access procedure in the idle duration associated with the period, and transmitting a first SL transmission over a channel in the channel occupancy associated with the period after successfully performing the SL channel access procedure.