Dynamic Frequency Assignment for IEEE 802.11 Networks
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Solution Overview
Problem
Existing frequency allocation mechanisms for IEEE 802.11b wireless networks do not consider the combined effect of physical channel and MAC protocol, leading to co-channel interference and degraded network throughput, despite the robustness of the CSMA protocol in avoiding interference.
Innovation Solution
A frequency planning mechanism that assigns channels to access points based on traffic load information, determining sets of interferers and using signal path loss and transmission power to minimize co-channel interference, thereby optimizing network throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency assignment is based on traditional cellular network schemes without considering traffic load, then implementation is simple, but co-channel interference increases and network throughput degrades
Solution Approach 1:
The patent changes the parameters of frequency assignment from static traditional cellular schemes to dynamic schemes that consider traffic load, signal path loss, and transmission power. By adjusting frequency assignment based on these varying parameters, the system optimizes network throughput while managing co-channel interference effectively.
Solution Approach 2:
The patent implements a feedback mechanism where traffic load information, signal path loss, and transmission power data are continuously collected and used to adjust frequency assignments. This feedback loop enables the system to adapt to changing network conditions and optimize performance dynamically.
2Productivity
If the same frequency is assigned to access points without considering their traffic load and interference patterns, then frequency allocation is simple, but signal collisions increase and network performance degrades
Solution Approach 1:
The patent applies local quality by assigning frequencies based on local conditions of each access point, including its traffic load, signal path loss to other access points, and transmission power. Instead of a uniform frequency assignment scheme, each access point receives a customized frequency assignment tailored to its specific operational context, thereby minimizing co-channel interference locally while maximizing overall network throughput.
3Reliability
If frequency assignment ignores traffic load information and focuses only on geographical separation, then implementation is straightforward, but interference management becomes ineffective in dense networks
Solution Approach 1:
The patent performs preliminary actions by collecting traffic load information, calculating signal path loss, and determining transmission power levels before making frequency assignments. This preparatory data collection and analysis enables the system to make informed frequency assignment decisions that proactively manage interference rather than reacting to it after problems occur.
Data Source
AI summary
A frequency planning method for use in an IEEE 802.11 wireless network is described. The frequency planning method obtains traffic load information associated with access points belonging to a multi-cell wireless network and assigns channels to the access points based on the traffic load information.