Priority-Based Channel Access Offset for Wireless Latency
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Solution Overview
Problem
In wireless communication systems, especially in unlicensed spectrum bands, there is a challenge in ensuring fair coexistence among devices and optimizing channel access to minimize latency and interference, particularly in scenarios where multiple users with varying priority levels compete for channel occupancy time (COT) in frame-based equipment (FBE) configurations.
Innovation Solution
The implementation of priority-based channel access mechanisms, where user equipment (UE) identifies its priority level and performs clear channel assessments (CCAs) using offset parameters tailored to its priority, allowing higher-priority UEs to access the channel earlier and potentially transmit during floating COTs, while lower-priority UEs are protected from interference through receiver protection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If higher-priority UEs are allowed to perform CCA earlier with offset parameters, then latency for high-priority communications is reduced, but interference to lower-priority UEs increases
Solution Approach 1:
The patent applies parameter changes by introducing priority-based offset parameters that modify the CCA timing for different UE priority levels. Higher-priority UEs use smaller offset values to perform CCA earlier, while lower-priority UEs use larger offsets, dynamically adjusting access timing parameters to resolve the latency-interference contradiction
Solution Approach 2:
The patent implements preliminary action by having higher-priority UEs perform CCA and potentially transmit before lower-priority UEs attempt channel access. This advance action for high-priority traffic reduces their latency while the system manages interference through priority-based scheduling and receiver protection mechanisms
2Productivity
If priority-based offset parameters are implemented for CCA, then channel access efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the channel access process into priority-based segments, where different offset parameters are assigned to different priority levels. This segmentation organizes the complex priority-based access into manageable groups, improving efficiency while controlling complexity through structured parameter assignment
Solution Approach 2:
The patent implements universality by creating a multi-functional offset parameter system that serves multiple purposes: it differentiates priority levels, schedules CCA timing, and coordinates receiver protection. This universal parameter approach improves channel access efficiency across different scenarios while avoiding the need for separate complex mechanisms for each function
3Reliability
If receiver protection signals are transmitted during lower-priority UE CCA, then reliability of high-priority communications is improved, but energy consumption increases
Solution Approach 1:
The patent applies preliminary anti-action by transmitting receiver protection signals before lower-priority UEs perform their CCA procedures. This advance protective action ensures high-priority communications are shielded from potential interference, improving reliability while the energy consumption is managed through priority-based selective protection
Solution Approach 2:
The patent implements preliminary action by proactively transmitting receiver protection signals in advance of potential interference from lower-priority UEs. This preliminary protective measure guarantees high-priority communication reliability, with energy consumption optimized through priority-based determination of when protection is necessary
Data Source
AI summary
A method of wireless communication performed by a user equipment (UE), the method comprising identifying a priority level associated with the UE; and performing a clear channel assessment for a channel occupancy time (COT) according to an offset parameter, wherein the offset parameter is based on the priority level associated with the UE.