Access Point Coordination for Wireless Interference Reduction
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Solution Overview
Problem
Densely deployed wireless networks experience significant co-channel interference due to overlapping service areas, leading to packet collisions and reduced throughput, especially in systems using the 2.4 GHz band where limited channels result in frequent interference between neighboring Basic Service Sets (BSSs).
Innovation Solution
Implementing a method where access points in wireless networks detect and coordinate transmissions to minimize interference by determining the presence of significant interference, scheduling transmissions to avoid overlap, and using coordinated access point scheduling to allocate time slots, thereby reducing collisions and enhancing network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If access points are densely deployed to expand network coverage, then network coverage area is improved, but co-channel interference increases
Solution Approach 1:
The patent implements periodic transmission scheduling where access points transmit during allocated time slots rather than continuously. This periodic action allows spatial reuse of channels while preventing constant interference, enabling dense deployment without proportional increase in interference.
Solution Approach 2:
The system dynamically adjusts transmission schedules and time slot allocations based on real-time interference conditions and traffic demands. This dynamic adaptation allows the network to maintain optimal performance as access points are added or removed, resolving the contradiction between density and interference.
2Productivity
If transmissions occur simultaneously in overlapping Basic Service Sets, then network throughput is improved, but packet collisions increase
Solution Approach 1:
The patent segments the transmission medium into distinct time slots for different Basic Service Sets. This segmentation allows simultaneous transmissions in different BSSs without collisions, as each BSS has dedicated time windows for transmission, thereby maintaining throughput while eliminating packet collisions.
Solution Approach 2:
The system performs preliminary scheduling of transmission time slots before actual data transmission. By pre-coordinating which BSS transmits during which time slots, the system prevents collisions before they occur, ensuring reliable simultaneous transmissions across multiple BSSs.
3Productivity
If access points use the same channel to maximize spectrum efficiency, then spectrum efficiency is improved, but interference between neighboring BSSs increases
Solution Approach 1:
The patent employs periodic time-division multiplexing where neighboring BSSs share the same channel but transmit during different periodic time slots. This allows maximum spectrum efficiency through channel reuse while preventing interference through temporal separation, resolving the contradiction between efficiency and interference.
Data Source
AI summary
A presence of interference between a first wireless network and a second wireless network is determined. Transmissions in the first wireless network are coordinated with transmissions in the second wireless network to reduce interference between the first wireless network and the second wireless network. Transmissions in the first wireless network are scheduled based on the coordinating to reduce interference between the first wireless network and the second wireless network.