Automatic Frequency Adjustment System Interference Mitigation
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Solution Overview
Problem
Conventional automatic frequency adjustment systems fail to effectively detect and mitigate radio interference from wireless LAN APs to existing wireless stations, particularly due to uncertainties in indoor and outdoor transmission losses and terrain clutter.
Innovation Solution
The proposed method involves a wireless system with a beacon demodulator and an automatic frequency adjustment system that uses beacon frames to identify interfering wireless LAN APs, adjusts channel numbers and transmission powers, and stops transmission operations when interference is detected based on reception quality measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional automatic frequency adjustment systems provide channel number and power information to wireless LAN APs, then frequency sharing is enabled, but existing wireless stations cannot be completely protected from interference signals
Solution Approach 1:
The system implements a feedback mechanism where reception quality measurement devices at existing wireless stations continuously monitor interference levels and report to the AFC server. The server then adjusts channel assignments and power levels of wireless LAN APs based on this feedback, creating a closed-loop control system that dynamically protects existing stations while enabling frequency sharing.
Solution Approach 2:
The system performs preliminary actions by pre-registering wireless LAN APs with the AFC server and pre-configuring channel and power information before actual operation. This allows the system to proactively manage frequency sharing and prevent interference before it occurs, rather than reacting after interference has damaged communications.
2Productivity
If wireless LAN APs transmit signals based on provided channel and power information, then frequency utilization is improved, but interference detection and identification capability is lost
Solution Approach 1:
The system introduces reception quality measurement devices as intermediary components at existing wireless stations that specifically monitor for interference signals. These intermediaries detect and report interference conditions to the AFC server, enabling the system to maintain high frequency utilization while preserving interference detection capability through dedicated monitoring components.
3Productivity
If the system provides maximum allowable power information to wireless LAN APs, then frequency sharing efficiency is improved, but interference mitigation reliability is reduced due to transmission loss uncertainties
Solution Approach 1:
The system transitions from static power allocation to dynamic power control by continuously adjusting the maximum allowable power information provided to wireless LAN APs based on real-time reception quality feedback. This dynamic adjustment allows the system to optimize frequency sharing efficiency while compensating for transmission loss variations and terrain effects, maintaining reliable interference mitigation.
Data Source
AI summary
A wireless system including a wireless station and an automatic frequency adjustment system and a method for controlling the same are disclosed. According to one embodiment of the present disclosure, the wireless system may include a wireless station including a beacon demodulator and an automatic frequency adjustment system having a database including identification information of a plurality of wireless local area network (LAN) access points (Aps), and the wireless station may be configured to: obtain information related to a first beacon frame by demodulating the first beacon frame transmitted from a first wireless LAN AP through the beacon demodulator and transmit the information related to the first beacon frame to the automatic frequency adjustment system.