Dynamic Hysteresis Adjustment for Wireless Handover
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Solution Overview
Problem
In broadband wireless communication systems, the use of a fixed hysteresis value for handover in cellular-based wireless communication systems leads to handover delays and ping-pong effects, particularly when mobile stations move quickly, resulting in communication disruptions and reduced system capacity.
Innovation Solution
A method and apparatus that predict the movement path of mobile stations, group them based on shared paths and signal strength correlations, and dynamically adjust hysteresis values for mobile stations within the same group, allowing for more accurate handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed hysteresis value is used for handover, then the ping-pong effect is reduced, but handover delay increases
Solution Approach 1:
The patent applies dynamics by making the hysteresis value adjustable rather than fixed. The base station dynamically modifies hysteresis values for different mobile stations based on their movement characteristics, allowing the system to adapt between reducing ping-pong effects and minimizing handover delays according to real-time conditions
Solution Approach 2:
The patent changes the hysteresis parameter from a fixed value to a dynamically modified value. The base station controller modifies hysteresis parameters based on movement path correlation and handover timing, enabling optimization of both ping-pong effect reduction and handover delay minimization through parameter adjustment
2Reliability
If a fixed hysteresis value is used for handover, then the ping-pong effect is reduced, but system capacity decreases
Solution Approach 1:
The patent applies local quality by implementing different hysteresis values for different mobile stations based on their individual movement characteristics. Mobile stations with high movement path correlation receive different hysteresis modifications compared to those with low correlation, allowing optimized handover control for each local condition
Solution Approach 2:
The system dynamically adjusts hysteresis parameters based on movement path correlation and handover timing observations, enabling the network to optimize system capacity by reducing unnecessary handovers while maintaining reliable connections, thereby improving overall productivity
3Loss of time
If movement path prediction and grouping is implemented, then handover delay is reduced, but device complexity increases
Solution Approach 1:
The patent merges multiple mobile stations with similar movement characteristics into groups. The base station controller manages groups of mobile stations based on movement path correlation, allowing centralized control and reduced complexity compared to individual processing of each mobile station
Solution Approach 2:
Mobile stations contribute to the system by providing measurement information and handover execution feedback, which the base station controller uses to refine movement path predictions and hysteresis adjustments, creating a self-improving system that reduces complexity over time
Data Source
AI summary
An apparatus and method for performing a handover in a broadband wireless communication system is provided. In the broadband wireless communication system, a base station includes: a grouping unit for grouping mobile stations by using information on a movement path of each mobile station and information on a received signal strength of a neighboring base station, thereby constituting at least one group; a controller for modifying hystereses of remaining mobile stations among the mobile stations belonging to the same group, if a predetermined number of mobile stations perform handovers; and a transmitter for transmitting a message including modified hysteresis information to the remaining mobile stations belonging to the group.