Adaptive Proactive Scanning for Mobile Handoff Latency and Battery
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Solution Overview
Problem
In wireless networks, mobile devices experience latency and battery drain due to frequent channel scanning during handoffs, which affects seamless transitions and standby time.
Innovation Solution
An adaptive proactive scanning mechanism that adjusts scanning rates based on the necessity of handoff, using defined scan modes (fast, intermediate, and slow) and triggers to minimize scanning latency while conserving battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If periodic proactive scanning is performed to eliminate scanning latency, then handoff capability is improved, but battery energy is drained
Solution Approach 1:
The patent applies dynamics by making the scanning rate adjustable rather than fixed. The scanning mechanism transitions between different scan modes (fast, intermediate, slow) based on handoff necessity, allowing the system to adapt its energy consumption and scanning speed to current operational requirements. This resolves the contradiction by enabling fast scanning only when handoff is imminent while using slow scanning during stable conditions.
Solution Approach 2:
The patent changes the parameter of scanning rate from a constant value to a variable that can be adjusted between multiple discrete levels. By introducing scan modes with different scanning rates (fast, intermediate, slow) and dynamically selecting among them based on handoff triggers, the system optimizes both scanning latency and battery energy usage according to actual network conditions.
2Speed
If scanning rate is increased to ensure channel information availability, then handoff speed is improved, but standby time is reduced
Solution Approach 1:
The scanning rate is made dynamic rather than static, allowing the system to switch between fast, intermediate, and slow scan modes based on handoff necessity. During active calls or when handoff triggers are detected, fast scanning ensures rapid channel information acquisition for quick handoff. During idle standby periods, slow scanning preserves battery life while maintaining minimal channel awareness.
Solution Approach 2:
The system performs preliminary scanning actions at reduced rates during standby modes, maintaining just enough channel information to detect when handoff becomes necessary. This preliminary, low-intensity scanning preserves battery life during extended standby periods while still enabling rapid response when handoff triggers are activated.
3Reliability
If frequent scanning is performed to maintain channel information, then handoff reliability is improved, but energy consumption increases
Solution Approach 1:
The scanning frequency is made dynamic, adjusting between fast, intermediate, and slow modes based on actual handoff necessity. The system maintains handoff reliability by switching to fast scanning when triggers indicate impending handoff, while conserving energy through slow scanning during stable conditions where handoff is not imminent.
Solution Approach 2:
The system uses feedback from handoff triggers and channel condition monitoring to dynamically adjust scanning frequency. When channel degradation or handoff triggers are detected, the system increases scanning rate to maintain reliability. When conditions are stable, scanning rate is reduced to conserve energy, with the understanding that triggers will prompt increased scanning if conditions deteriorate.
Data Source
AI summary
A scanning technique to select the best channel a mobile handset needs when approaching handoff is described. More specifically a system and method for an adaptive proactive scanning mechanism in which the rate of scanning is determined by the necessity to handoff and battery power is disclosed.