Adjustable Multi-Link Clear Channel Assessment for Wireless Networks
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing access delay, improving transmission reliability, and increasing throughput, particularly in multi-link communication scenarios where simultaneous transmission and reception constraints lead to unreliable channel assessments due to self-interference and incorrect measurement results.
Innovation Solution
The implementation of an adjustable multi-link clear channel assessment (ML-CCA) mechanism that modifies the energy detection threshold based on self-interference measurements, allowing for independent channel assessment on each link and using network allocation vectors (NAV) to manage operational states, thereby reducing channel access latency and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmission and reception is performed on multiple wireless links, then throughput is increased, but transmission reliability deteriorates due to self-interference and incorrect channel assessment
Solution Approach 1:
The patent segments the channel assessment process into link-specific procedures, where each wireless link performs independent clear channel assessment (CCA) rather than sharing a common assessment. This allows simultaneous transmission and reception on multiple links by isolating the channel sensing process for each link, thereby maintaining throughput while improving reliability through accurate link-specific channel conditions
Solution Approach 2:
The patent applies different energy detection thresholds for different wireless links based on their specific interference environments. Instead of using a uniform threshold across all links, each link's CCA procedure is customized with locally optimized parameters, allowing accurate channel assessment even when other links are simultaneously transmitting or receiving, thus resolving the reliability issue while maintaining high throughput
2Measurement precision
If energy detection threshold is adjusted based on self-interference measurements, then channel assessment accuracy is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by having each wireless link automatically measure its own self-interference environment and adjust its energy detection threshold accordingly. The device performs self-calibration by monitoring the interference from other links within the multi-link system and dynamically adapting its CCA parameters, achieving high measurement precision without requiring external calibration or complex manual configuration
Solution Approach 2:
The patent incorporates feedback mechanisms where the measured self-interference levels from each link are fed back into the threshold adjustment process. The energy detection threshold for each link is dynamically updated based on real-time feedback about the interference environment, creating a closed-loop system that maintains accurate channel assessment while using straightforward measurement and adjustment logic that limits complexity growth
Data Source
AI summary
The present document discloses methods, systems, and devices related to digital wireless communications, and more specifically, to techniques related to adjustable clear channel assessment for simultaneous transmission and reception constraint multi-link device. The method of the adjustable multi-link clear channel assessment includes adjustment of signal strength measurement algorithm or adjustment of energy detection threshold for the assessment when the multi-link network allocation vector is set for the transmission. A method for wireless communication includes identifying, by a wireless device, that a first wireless link and a second wireless link of the wireless device are in a detecting state at a first time. The method also includes modifying, by the wireless device, a multi-link channel availability assessment procedure of a second wireless link based on detecting a transmission state of the first wireless link at the first time.