Mobile Station Handover via Adaptive Background Scanning
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Solution Overview
Problem
Conventional handover mechanisms in wireless local area networks (WLANs) rely on mobile stations to initiate handovers, which can lead to inefficient signal strength monitoring and delayed handovers due to periodic scanning and threshold-based decisions, affecting network stability and user experience.
Innovation Solution
A method where a mobile station in a WLAN system determines an averaged signal strength from the current base station, sets a scan period based on this strength, and performs background scans to monitor other base stations, triggering a handover when a significant signal strength difference is maintained above a threshold for a preset period, ensuring seamless connection transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station performs periodic scanning to monitor signal strength from multiple base stations, then handover decisions can be made based on signal strength thresholds, but this results in delayed handovers and inefficient monitoring that affects network stability
Solution Approach 1:
The system performs preliminary actions by continuously maintaining background scans that proactively monitor signal strengths from multiple base stations before handover is actually needed. This allows the mobile station to have advance knowledge of available base stations and their signal strengths, eliminating the delay of discovering alternatives only when current connection degrades.
Solution Approach 2:
The background scan operates continuously in the background during normal operation, maintaining uninterrupted monitoring of other base stations. This continuous useful action ensures that when handover becomes necessary, the mobile station already has current information about alternative base stations, eliminating periodic scanning delays while maintaining network stability through constant monitoring.
2Reliability
If the mobile station performs comprehensive scanning of all base stations periodically, then all available base stations can be monitored, but this consumes excessive energy and processing resources
Solution Approach 1:
The system applies partial action by performing background scans that monitor multiple base stations simultaneously in the background, rather than exhaustively scanning all possible base stations in the foreground. This partial monitoring approach provides sufficient information for reliable handover decisions without the excessive energy consumption of comprehensive periodic scanning of all base stations.
Solution Approach 2:
The background scan operates at optimized intervals rather than continuously, performing periodic monitoring that balances reliability with energy efficiency. By scheduling scans at appropriate intervals and performing them in the background, the system maintains handover reliability while avoiding the excessive energy consumption of continuous or overly frequent comprehensive scanning.
3Ease of operation
If the mobile station uses threshold-based handover decisions, then handover triggers are simple to implement, but this results in premature or delayed handovers that affect user experience
Solution Approach 1:
The system uses feedback by continuously comparing signal strength measurements from background scans against threshold criteria. The mobile station monitors signal strengths from multiple base stations and uses this feedback information to make informed handover decisions, adjusting based on the relative signal strengths and maintaining simple threshold-based logic while improving accuracy through comprehensive background information.
Solution Approach 2:
By performing preliminary background scans that gather information about multiple base stations before handover decisions are needed, the system ensures that when threshold-based decisions are made, they are based on current and accurate signal strength information. This preliminary information gathering prevents premature or delayed handovers while maintaining the simplicity of threshold-based decision-making.
Data Source
AI summary
A mobile station operating in a wireless network system comprising a plurality of base stations is disclosed. A communication unit receives the messages from a first base station of the wireless network system to which the mobile station is currently connected. A signal detection unit detects a first averaged signal strength corresponding to the messages received from the first base station. A processor determines a scan period according to the first averaged signal strength, performing a background scan, at intervals during the scan period, to monitor messages from the plurality of base stations within the wireless network system.