5G NR Handover Margin Control to Reduce Ping-Pong Switching
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Solution Overview
Problem
The frequent handover mechanisms in 5G NR networks due to dense ultra-dense networks lead to ping-pong effects, where mobile communication devices frequently switch between base stations based solely on signal strength, causing unnecessary handovers.
Innovation Solution
A determination method and system that utilize handover parameters to calculate the position, velocity, and signal strength of mobile communication devices within a 5G NR network, employing fuzzy logic to set a handover margin threshold and time-to-trigger, determining optimal base station transitions based on these factors to minimize unnecessary handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover decisions are made frequently based on signal strength in ultra-dense networks, then coverage continuity is improved, but ping-pong effects occur causing unnecessary handovers
Solution Approach 1:
The patent applies preliminary action by introducing a time-to-trigger mechanism that evaluates signal strength over a period of time before executing handover. This preliminary evaluation prevents impulsive handover decisions caused by temporary signal fluctuations, thereby reducing ping-pong effects while maintaining coverage continuity.
Solution Approach 2:
The patent changes the handover decision parameters by incorporating not only signal strength but also position information, moving velocity, and time-to-trigger. These parameter changes transform the handover mechanism from a simple signal-threshold-based system to a more comprehensive evaluation system that accounts for device dynamics and temporal variations.
2Area of stationary object
If handover threshold is lowered to enable more handover opportunities, then network coverage is improved, but unnecessary handovers increase causing ping-pong effects
Solution Approach 1:
The patent introduces multiple parameter changes including position coordinates, moving velocity, and time-to-trigger in addition to signal strength. These parameter changes create a more robust handover evaluation that prevents premature handovers while maintaining adequate coverage, thereby reducing unnecessary handover time losses.
Solution Approach 2:
The patent uses position information and time-to-trigger as intermediary factors between signal strength measurement and handover execution. These intermediaries filter out transient signal variations and ensure that handovers occur only when genuinely beneficial, reducing unnecessary handover time while maintaining coverage.
3Speed
If handover decisions are made quickly without additional parameters, then response time is reduced, but accuracy of handover timing is insufficient leading to ping-pong effects
Solution Approach 1:
The patent applies preliminary action through the time-to-trigger mechanism that continuously monitors signal conditions before handover execution. This preliminary monitoring phase maintains quick response capability while ensuring timing accuracy by confirming sustained signal superiority before committing to handover.
Solution Approach 2:
The patent adds temporal dimension through time-to-trigger and spatial dimension through position information to the traditional signal-strength-based handover decision. This dimensional expansion enables both fast response and high accuracy by evaluating handover conditions across multiple dimensions rather than relying solely on instantaneous signal strength.
Data Source
AI summary
A determination method of a handover mechanism and a determination system of a handover mechanism are provided and are used in a plurality of base stations within a 5G NR network. There is a mobile communication device within the signal common coverage scope of the plurality of base stations. By the determination method of the handover mechanism and the determination system of a handover mechanism, the mobile communication device is switched to have a communication connection with a target base station after the signal strength between the mobile communication device and each base station is ensured to reduce the generation of ping-pong effects.