Wireless Access Point Interference Control via Dynamic Power Adjustment
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Solution Overview
Problem
Conventional methods for controlling wireless access points to minimize interference between neighboring access points are inefficient and require individual power adjustments, leading to prolonged interference minimization times and suboptimal network performance.
Innovation Solution
A device and method that group access points using the same channel, compute and adjust output strength values based on received signal strength indicators (RSSI) and ACK communication failures, allowing for simultaneous interference reduction without cell planning procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a separate AP is installed in shadow areas to widen coverage, then coverage area is improved, but interference between APs increases
Solution Approach 1:
The patent applies dynamics by making the transmission power of access points adjustable rather than fixed. The control server dynamically modifies transmission power levels based on real-time interference conditions and signal strength measurements, allowing the system to adapt to changing network conditions while maintaining both coverage and minimizing interference.
Solution Approach 2:
The patent changes the parameter of transmission power from a fixed value to a variable parameter that can be adjusted based on RSSI readings and interference conditions. By modifying transmission power levels dynamically, the system optimizes the balance between coverage expansion and interference reduction.
2Object-generated harmful factors
If each sub-AP adjusts transmission power individually based on RSSI and FER, then interference minimization is attempted, but the process is time-consuming and inefficient
Solution Approach 1:
The patent merges the interference minimization function from individual APs to a centralized control server. Instead of each AP independently adjusting its power (which causes delays), the control server collects RSSI and FER information from all APs and coordinates power adjustments across the entire network simultaneously, dramatically reducing the time required to minimize interference.
Solution Approach 2:
The control server acts as an intermediary between the access points and the interference minimization process. It receives measurement data from APs, processes the information to determine optimal power levels, and coordinates adjustments across multiple APs, eliminating the need for each AP to independently and sequentially adjust its own power.
3Area of stationary object
If a separate AP transmits fixed transmission power to eliminate shadow areas, then coverage is improved, but excessive transmission power causes interference and deteriorates network performance
Solution Approach 1:
The system transitions from fixed transmission power to dynamic, adjustable transmission power. The control server continuously monitors network conditions including signal strength and interference levels, and adjusts power levels in real-time to maintain optimal network performance while ensuring adequate coverage.
Solution Approach 2:
The patent implements feedback mechanisms where access points report RSSI (received signal strength indicator) and FER (frame error rate) measurements to the control server. Based on this feedback, the control server adjusts transmission power levels to optimize both coverage and network performance, preventing excessive power that would cause interference.
Data Source
AI summary
The device for controlling a wireless access point comprises: a grouping unit which groups wireless access points which use the same channel, by using channel use information received from the wireless access points; a map generator which computes each received signal strength value of the grouped wireless access points and each output strength value of the grouped wireless access points; an extractor which extracts a wireless access point having the highest received signal strength value among the grouped wireless access points, if interference occurs between said grouped wireless access points; and an optimal output strength value-calculator which computes a corrected output strength value by using the received signal strength value of the extracted wireless access point, a threshold value of predetermined received signal strength, and a currently used output strength value between said grouped wireless access points.