802.11 Channel Availability Table Exchange for Interference Avoidance
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Solution Overview
Problem
IEEE 802.11 devices face limitations in flexible channel utilization due to unplanned shared spectrum with other devices, interference from higher priority users, and electromagnetic noise, leading to constrained communication capabilities in terms of frequency, time, and transmission rate.
Innovation Solution
The systems and methods provide protocols for 802.11 devices to exchange dynamically changing local channel availability tables to form a mutual channel availability table, enabling opportunistic use of link resources by adapting packet duration, frequency utilization, and transmission rate, and allowing devices to signal unavailability to avoid interference with co-located technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If 802.11 devices operate on unlicensed shared spectrum, then spectrum availability increases, but interference from higher priority users and electromagnetic noise increases
Solution Approach 1:
The system performs preliminary sensing of the channel before transmission to detect higher priority users and electromagnetic noise. This advance detection allows devices to prepare appropriate transmission parameters or defer transmission, resolving the contradiction by acting beforehand to avoid interference while maintaining spectrum availability
Solution Approach 2:
The system dynamically adjusts transmission parameters such as modulation and coding scheme, transmission power, and packet size based on real-time channel conditions. This dynamic adaptation allows devices to optimize performance in the presence of interference while still utilizing the shared spectrum, resolving the contradiction between spectrum availability and interference
2Device complexity
If devices share resources such as antennas or radios with co-located wireless technologies, then device complexity is reduced, but channel utilization flexibility is constrained
Solution Approach 1:
The system implements periodic sensing and parameter adjustment cycles that allow co-located wireless technologies to share resources temporally. By alternating between different technologies or modes in periodic intervals, the system maintains resource sharing while achieving flexible channel utilization through time-division multiplexing
Solution Approach 2:
The system changes transmission parameters such as frequency, time, and power dynamically to accommodate different co-located technologies. This parameter adaptation allows the same physical resources to serve multiple wireless technologies with different channel requirements, resolving the contradiction between device complexity and channel utilization flexibility
3Reliability
If devices detect and defer to higher priority users, then coexistence with preferential users is improved, but transmission opportunities are reduced
Solution Approach 1:
The system implements partial deferral by sensing for higher priority users only during specific time intervals or frequency bands rather than continuously across all resources. This selective sensing approach maintains reliable coexistence with preferential users while capturing transmission opportunities in resources where deferral is not required, resolving the contradiction between coexistence and productivity
Data Source
AI summary
In some aspects, the disclosure is directed to methods and systems for utilizing protocols to enable two 802.11 devices to exchange their dynamically-changing local channel availability table and form a mutual channel availability table with time, frequency, and transmission rate domains available. This table may be used to make optimum opportunistic use of link resources by adapting packet duration, frequency utilization and transmission rate to channel conditions.