Sub-band Energy Detection for Wireless Access Fairness
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing uplink transmission time-instants in unlicensed spectrums, particularly with the increase in carrier bandwidth, leading to potential collisions and reduced resource utilization.
Innovation Solution
The method involves performing energy detections in multiple time sub-pools within a sub-band to determine candidate time-instant subsets, allowing for flexible configuration of transmission starting times based on frequency domain bandwidth, thereby reducing collision probability and ensuring fair access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier-based LBT is used with increased carrier bandwidth, then resource utilization is improved, but collision probability increases
Solution Approach 1:
The patent divides the carrier bandwidth into multiple sub-bands, each performing independent LBT. This segmentation allows multiple users to access different sub-bands simultaneously without collision, while maintaining efficient resource utilization across the entire carrier. The sub-band based approach resolves the contradiction by enabling parallel access opportunities.
Solution Approach 2:
The patent introduces a frequency domain dimension by creating multiple sub-bands within the carrier bandwidth. Instead of a single carrier-based LBT, the system performs LBT across multiple frequency segments, adding a dimensional aspect that enables simultaneous access without increasing collision probability.
2Reliability
If sub-band based LBT is implemented, then collision probability is reduced, but system complexity increases
Solution Approach 1:
The patent designs a unified LBT mechanism that works across both sub-band based and carrier based modes. The same fundamental LBT procedure is applied to each sub-band, and the results are aggregated to determine overall channel availability. This universal approach reduces complexity compared to implementing completely separate LBT systems while maintaining collision reduction benefits.
Solution Approach 2:
The patent merges sub-band LBT results with carrier-based access control mechanisms. The LBT outcomes from multiple sub-bands are combined to determine overall transmission permission, integrating fine-grained sub-band control with coarser carrier-level management to balance complexity and performance.
3Adaptability or versatility
If multiple candidate time-instant subsets are configured, then access flexibility is improved, but control information overhead increases
Solution Approach 1:
The patent configures multiple candidate time-instant subsets as potential access opportunities, but not all must be utilized. The system allows selective activation of time-instant subsets based on actual channel conditions and traffic demands. This partial utilization approach provides flexibility when needed while minimizing control overhead during normal operation.
Solution Approach 2:
The patent implements dynamic configuration of time-instant subsets where the active set can change based on channel conditions, traffic patterns, and system state. The system transitions between different time-instant subset configurations dynamically, allowing adaptation to varying conditions without requiring all configurations to be actively managed simultaneously, thus reducing overhead.
Data Source
AI summary
The disclosure discloses a method and device in a communication node for wireless communication. The communication node receives first information, and performs Q energy detections respectively in Q time sub-pools within a first sub-band, and if energy detected by each energy detection of the Q energy detections is lower than a first threshold, starts to transmit a first radio signal at a first time-instant; the first information is used to determine K candidate time-instant subsets; a target time-instant subset is one of the K candidate time-instant subsets, the first time-instant belongs to the target time-instant subset; a frequency-domain bandwidth of the first sub-band is used to determine the target time-instant subset out of the K candidate time-instant subsets, and frequency-domain resources occupied by the first radio signal belong to the first sub-band. The disclosure can improve access fairness.