Dynamic CCA Threshold Adjustment for Heterogeneous Bandwidth COT Sharing
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Solution Overview
Problem
In wireless communication systems, especially in 5G NR, the existing channel occupancy time (COT) sharing procedures face challenges under heterogeneous bandwidth conditions, where the difference in sensing bandwidths between base stations and user equipment (UE) affects the clear channel assessment (CCA) threshold, leading to inefficiencies in resource utilization and communication reliability.
Innovation Solution
The method involves determining and adjusting the CCA threshold based on the difference between the UE's sensing bandwidth and the base station's sensing bandwidth, using a ratio of reference and transmission bandwidths, and signaling the adjusted threshold to enable effective COT sharing, thereby optimizing channel access and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed CCA threshold is used for COT sharing procedures, then the procedure is simple to implement, but resource utilization becomes inefficient under heterogeneous bandwidth conditions
Solution Approach 1:
The CCA threshold is changed from a fixed value to a dynamic value that adapts to different bandwidth conditions. The threshold is adjusted based on the ratio between the UE's sensing bandwidth and the base station's sensing bandwidth, allowing the system to optimize resource utilization efficiency while maintaining implementation feasibility through standardized adjustment rules.
Solution Approach 2:
The invention modifies the CCA threshold parameter according to bandwidth heterogeneity. By calculating the ratio of UE sensing bandwidth to base station sensing bandwidth and applying this ratio to adjust the threshold, the system achieves efficient resource utilization across different bandwidth conditions without requiring completely new procedures.
2Productivity
If the CCA threshold is adjusted based on bandwidth differences, then resource allocation becomes optimized, but the procedure complexity increases
Solution Approach 1:
The invention optimizes resource allocation by adjusting the CCA threshold parameter based on the ratio of UE sensing bandwidth to base station sensing bandwidth. This parameter change approach achieves optimization while maintaining relatively simple procedures, as the adjustment follows a clear mathematical relationship rather than requiring complex multi-step processes.
Solution Approach 2:
The base station signals the adjusted CCA threshold to the UE, creating a feedback mechanism that guides the UE's channel access behavior. This feedback loop enables optimized resource allocation while keeping the UE's implementation simple, as the UE only needs to apply the received threshold value rather than performing complex calculations.
3Adaptability or versatility
If different sensing bandwidths are used by base stations and UEs, then each device can operate at its optimal bandwidth, but the CCA threshold accuracy deteriorates
Solution Approach 1:
The invention maintains CCA threshold accuracy despite different sensing bandwidths by introducing a bandwidth ratio adjustment factor. The threshold is scaled according to the ratio of UE sensing bandwidth to base station sensing bandwidth, ensuring that the threshold remains accurate and appropriate for the UE's specific bandwidth conditions while allowing both devices to operate at their optimal bandwidths.
Solution Approach 2:
The invention acknowledges and utilizes the asymmetric bandwidth configuration between base station and UE. Rather than requiring symmetric bandwidth operation, the system adjusts the CCA threshold to account for the asymmetry, allowing each device to operate at its optimal bandwidth while maintaining threshold accuracy through the ratio-based adjustment.
Data Source
AI summary
The present disclosure relates to methods and devices for wireless communication including an apparatus, e.g., a UE and/or a base station. In one aspect, the apparatus may determine a CCA threshold corresponding to at least one bandwidth, the at least one bandwidth being associated with a COT sharing procedure. The apparatus may also adjust the CCA threshold corresponding to the at least one bandwidth based on at least one of one or more sensing bandwidths or one or more granted resources for the COT sharing procedure. Additionally, the apparatus may signal the adjusted CCA threshold corresponding to the at least one bandwidth to at least one of a node or a base station.