Wireless Handover Control System for Ping-Pong Effect Mitigation
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Solution Overview
Problem
Frequent handovers between wireless communication networks can increase network load, cause service interruptions, and reduce the quality of data, voice, and video streams due to the ping-pong effect and adaptive hysteresis issues in wireless communication systems.
Innovation Solution
A handover control system that includes subscriber stations and access points with a handover monitor, configuration adjuster, and request generator to detect and mitigate frequent handovers by adjusting roaming hysteresis and other configurations, reducing the number of transitions between access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If handover threshold is lowered to enable seamless roaming, then mobility and connectivity are improved, but frequent handovers occur causing network load increase and service interruptions
Solution Approach 1:
The system dynamically adjusts the handover threshold based on current network conditions and terminal mobility patterns. Instead of using a fixed threshold, the handover decision criterion is made adaptive and variable, allowing the system to optimize between seamless roaming and service stability based on real-time conditions.
Solution Approach 2:
The system implements a feedback mechanism where handover history and network load information are continuously monitored and fed back into the handover decision process. This feedback loop allows the system to learn from past handover patterns and adjust thresholds to prevent frequent handovers while maintaining good roaming capability.
2Reliability
If handover hysteresis is increased to reduce ping-pong effect, then service stability is improved, but handover delay increases
Solution Approach 1:
The hysteresis value is made dynamic rather than fixed. The system adjusts hysteresis levels based on terminal velocity, signal conditions, and network state. When terminals are moving quickly or signal conditions are poor, lower hysteresis is applied to enable faster handovers. When conditions are stable, higher hysteresis is applied to prevent ping-pong effects.
Solution Approach 2:
The system changes the hysteresis parameter adaptively based on multiple factors including terminal mobility, signal strength variations, and network load. This parameter adjustment allows the system to optimize the balance between preventing ping-pong handovers and minimizing handover delays for different operating conditions.
3Measurement precision
If frequent handovers are allowed to maintain connection quality, then signal strength is optimized, but network load increases and service quality deteriorates
Solution Approach 1:
The system performs preliminary evaluation of handover candidates and predicts future signal conditions before making handover decisions. By anticipating signal strength changes and network conditions, the system can avoid unnecessary handovers that would occur if decisions were made solely based on current signal measurements.
Solution Approach 2:
The system adjusts handover decision parameters such as threshold values and hysteresis margins based on network load conditions. When network load is high, the system raises thresholds and increases hysteresis to reduce the frequency of handovers, thereby maintaining signal quality while preserving network efficiency.
Data Source
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AI summary
Embodiments of methods and apparatus for providing a handover control system associated with a wireless communication network are generally described herein. Other embodiments may be described and claimed.