FBE Sidelink Channel Access with CBR-Adaptive Parameters
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Solution Overview
Problem
Existing frame-based equipment (FBE) channel access methods in sidelink unlicensed communication face challenges in efficiently managing channel access parameters based on channel busy ratio (CBR) thresholds, leading to inefficiencies and potential channel access failures.
Innovation Solution
A device determines a CBR value and compares it to a configured threshold, adjusting channel access parameters such as FFP configuration, switching to different LBT bands or sub-bands, and changing resource block sets based on the comparison, to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the device uses fixed channel access parameters in unlicensed sidelink communication, then the device complexity is reduced, but the channel access efficiency deteriorates under varying CBR conditions
Solution Approach 1:
The patent implements dynamic channel access parameters by allowing the device to adjust FFP periodicity, FFP offset, and other access parameters based on real-time CBR measurements. The system transitions from static configured parameters to dynamically adapted parameters that respond to changing channel conditions, resolving the contradiction between simplicity and efficiency.
Solution Approach 2:
The patent changes physical parameters of the channel access mechanism by modifying FFP periodicity, FFP offset, and resource block sets based on CBR thresholds. When CBR exceeds thresholds, the system adjusts these parameters to optimize access efficiency, directly addressing the contradiction by making parameters adaptive rather than fixed.
2Reliability
If the device performs multiple channel access attempts in the FFP switching window, then the channel access reliability is improved, but the loss of time increases due to repeated access failures
Solution Approach 1:
The patent applies preliminary action by performing channel access attempts within a predefined FFP switching window before making configuration changes. This structured approach allows the device to gather sufficient access attempt data within a bounded time frame, improving reliability assessment while controlling time loss through the switching window mechanism.
Solution Approach 2:
The system implements feedback by monitoring the number of channel access attempts and comparing them against failure thresholds. Based on this feedback, the device determines whether to change FFP configuration or switch to different LBT bands, creating a closed-loop system that improves reliability while managing time consumption through adaptive decision-making.
3Productivity
If the device switches to different LBT bands or sub-bands when CBR threshold is satisfied, then the channel access efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent segments the LBT spectrum into multiple bands and sub-bands, allowing the device to switch between them based on CBR conditions. This segmentation enables improved channel access efficiency by providing alternative frequency resources while managing complexity through organized band structure and threshold-based switching rules.
Solution Approach 2:
The system implements self-service by autonomously monitoring CBR, comparing it to thresholds, and independently deciding whether to switch LBT bands or adjust FFP parameters without external intervention. This self-service capability improves channel access efficiency while managing complexity through automated decision-making based on pre-configured thresholds.
4Adaptability or versatility
If the device changes FFP configuration dynamically based on CBR, then the adaptability to channel conditions is improved, but the device complexity increases
Solution Approach 1:
The patent changes FFP configuration parameters (periodicity, offset) dynamically based on CBR measurements and threshold comparisons. This parameter adaptation improves versatility by allowing the system to respond to different channel conditions while managing complexity through structured parameter adjustment rules and threshold-based decision-making.
Solution Approach 2:
The system performs self-service by autonomously adjusting FFP configuration based on monitored CBR conditions without external control. This self-adjusting capability improves adaptability while managing complexity through automated monitoring and threshold-based parameter modification, eliminating the need for external configuration management.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein that may be associated with frame-based equipment (FBE) channel access in sidelink (SL) unlicensed. A wireless transmit/receive unit (WTRU) may receive configuration information that indicates a channel busy ratio (CBR) threshold. The WTRU may determine a CBR value associated with a channel in a listen before talk (LBT) band. The WTRU may compare the CBR value to the CBR threshold. The WTRU may determine a channel access parameter based on the comparison of the CBR value to the CBR threshold. The WTRU may change the channel access parameter.