Location-Based Mode Switching for Dual-Mode Mobile Terminals
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Solution Overview
Problem
Existing techniques for determining when to initiate mode switching between local wireless and cellular modes in dual mode mobile terminals are unreliable due to fluctuations in channel conditions, often resulting in unnecessary call drops or excessive mode switches, primarily relying on generic signal strength thresholds.
Innovation Solution
A dual mode mobile terminal that determines its current location to obtain location-specific mode switching information, using customized switching criteria to decide when to switch between local wireless and cellular modes, minimizing unnecessary handoffs and ensuring continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If generic signal strength thresholds are used for mode switching, then the switching mechanism is simple to implement, but the reliability of mode switching deteriorates due to channel fluctuations causing unnecessary switches or call drops
Solution Approach 1:
The patent applies local quality by transitioning from generic, uniform signal strength thresholds to location-specific switching criteria. Each geographic location is assigned customized switching parameters based on local channel characteristics, building layouts, and historical performance data. This allows the system to adapt to local conditions rather than applying a one-size-fits-all approach, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and storing optimal switching criteria for different locations before actual mode switching is needed. Location-specific parameters including signal thresholds, hysteresis values, and switching priorities are determined in advance through network planning and historical analysis, then stored in a database. When mode switching is required, the system simply retrieves the pre-determined criteria for the current location, avoiding real-time complex calculations while ensuring reliable switching decisions.
2Reliability
If high signal strength thresholds are set for mode switching, then call continuity is improved, but unnecessary mode switches increase when thresholds are set too low
Solution Approach 1:
The patent applies dynamics by making switching thresholds adaptive rather than static. The system dynamically adjusts signal strength thresholds, hysteresis margins, and switching priorities based on location-specific characteristics and real-time conditions. Different locations have different optimized parameters stored in a database, allowing the system to flexibly adapt to varying channel conditions, building environments, and traffic patterns without requiring uniformly high or low thresholds across all areas.
Solution Approach 2:
The patent implements parameter changes by modifying multiple switching parameters simultaneously based on location: signal strength thresholds, hysteresis values, switching priorities, and even the timing of switching decisions. These parameters are optimized for each location through network planning and historical performance analysis, then stored as location-specific criteria. The system retrieves and applies the appropriate parameter set for the current location, ensuring optimal balance between call continuity and switching efficiency for each geographic area.
Data Source
AI summary
The present invention provides a dual mode mobile terminal that is capable of supporting both cellular and local wireless communications. The mobile terminal operates to determine when to switch between local wireless communication and cellular modes. To determine when to switch between local wireless and cellular modes, the mobile terminal determines its current location, uses the current location to obtain mode switching information, and switches modes as necessary based on the mode switching information.