Dynamic Contention Window Adjustment for Multi-Numerology LBT Access
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing contention windows for channel access in unlicensed carriers with multiple numerologies, leading to inefficiencies and interference.
Innovation Solution
A method for determining a reference duration for contention window adjustment based on listen before talk (LBT) procedures, allowing for dynamic adjustment of contention windows in response to channel occupancy, thereby optimizing channel access in multi-numerology environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contention window size is increased to reduce collision probability in multi-numerology environments, then channel access reliability improves, but channel access delay increases
Solution Approach 1:
The contention window size is dynamically adjusted based on channel occupancy conditions and numerology types rather than using a fixed size. The system transitions from static to dynamic parameter adjustment, allowing the contention window to adapt to changing channel conditions and different numerology requirements, thereby balancing reliability and delay performance
Solution Approach 2:
The patent changes the contention window parameter based on channel occupancy measurements and numerology type identification. By modifying this key parameter adaptively, the system optimizes the trade-off between collision avoidance (reliability) and access speed (delay) for different channel conditions and numerology configurations
2Reliability
If LBT procedure duration is extended to improve channel sensing accuracy, then channel access reliability improves, but channel access efficiency deteriorates
Solution Approach 1:
Different LBT procedure durations and sensing requirements are applied to different numerology types and channel conditions rather than using a uniform approach. The system tailors the sensing accuracy and procedure length to local requirements, ensuring sufficient reliability for each case while avoiding unnecessary delays in efficiency-critical scenarios
Solution Approach 2:
The LBT procedure parameters including duration and sensing thresholds are dynamically changed based on channel occupancy conditions and numerology type. This adaptive parameter adjustment allows the system to maintain sensing accuracy when needed while reducing procedure overhead when channel conditions permit, thereby balancing reliability and efficiency
3Adaptability or versatility
If contention window adjustment is made more frequent to respond to channel conditions, then channel access adaptability improves, but system complexity increases
Solution Approach 1:
The system implements feedback mechanisms where channel occupancy measurements and access outcomes are used to adjust contention window parameters. This feedback-driven adaptation allows the system to respond to channel conditions automatically without requiring complex centralized control, balancing adaptability with manageable system complexity
Solution Approach 2:
The contention window adjustment mechanism operates autonomously based on local channel measurements and pre-defined rules. Each device performs self-adjustment without requiring complex coordination with other devices or centralized control, thereby achieving high adaptability while keeping system complexity distributed and manageable
Data Source
AI summary
A wireless device determines a reference duration for contention window adjustment, wherein the reference duration is from a beginning of a channel occupancy and until an end of a first slot where at least one physical uplink shared channel (PUSCH) is transmitted. The wireless device performs a listen before talk (LBT) procedure with a contention window value associated with the reference duration. The wireless device transmits at least one uplink signal after the LBT procedure indicates a clear channel.