Adaptive Handover Thresholds for Cellular Wi-Fi Transitions
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Solution Overview
Problem
Modern terrestrial telecommunication systems face challenges in efficiently determining when to perform handovers between different communication networks, such as LTE and Wi-Fi, due to varying signal strengths and network conditions, leading to issues like dropped calls and poor quality of service.
Innovation Solution
The system collects device diagnostic data, including RSRP, RSSI, and ping-pong timer values, to determine optimal handover thresholds and adjust them dynamically based on real-time network performance, allowing for seamless transitions between cellular and Wi-Fi networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If handover thresholds are set to be sensitive to signal strength changes, then handover responsiveness is improved, but handover stability deteriorates due to ping-pong effects
Solution Approach 1:
The patent applies dynamics by making the handover threshold adjustable and adaptive rather than fixed. The threshold is dynamically modified based on the number of failed handover attempts, increasing the threshold after failures to prevent ping-pong effects. This allows the system to respond quickly to genuine signal changes while filtering out transient fluctuations that cause instability.
Solution Approach 2:
The patent implements feedback by monitoring handover outcomes and using this information to adjust future handover decisions. When a handover fails or triggers a ping-pong effect, the system feeds back this information by increasing the threshold, thereby preventing immediate re-handover. This feedback mechanism stabilizes the system while maintaining responsiveness to legitimate signal changes.
2Stability of the object's composition
If handover thresholds are set to be conservative to avoid ping-pong effects, then handover stability is improved, but handover responsiveness deteriorates leading to dropped calls
Solution Approach 1:
The system dynamically adjusts the handover threshold based on real-time conditions. Under normal conditions, a lower threshold maintains responsiveness. When handover failures occur, the threshold increases temporarily to stabilize the connection, then gradually returns to normal levels. This dynamic adjustment prevents both ping-pong effects and dropped calls.
Solution Approach 2:
The patent changes the handover threshold parameter adaptively rather than using a fixed value. The threshold is modified based on the number of failed handovers, creating a state-dependent parameter that balances stability and responsiveness. This parameter change allows the system to maintain call continuity while avoiding unnecessary handovers.
3Measurement precision
If device diagnostic data is collected and processed in real-time, then handover decision accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the handover decision process into distinct components: signal strength measurement, failure count tracking, threshold calculation, and handover execution. Each component handles a specific aspect of the decision-making process, making the overall system more manageable and easier to implement despite the increased precision requirements.
Solution Approach 2:
The system performs self-service by automatically collecting device diagnostic data, processing it through the threshold calculation algorithm, and making handover decisions without external intervention. The device monitors its own signal conditions and autonomously adjusts handover parameters, reducing the need for complex external control systems while maintaining high decision accuracy.
Data Source
AI summary
A user equipment (UE) for handover processes between communication networks includes one or more processors, and one or more non-transitory computer-readable media storing instructions that when executed by the one or more processors, cause the UE to receive, by the UE, first diagnostic information, determine whether to perform a first handover from a first communication network to a second communication network based on a first set of thresholds, the first set of thresholds being based on the first diagnostic information, receive, by the UE, an update of the first diagnostic information, and determine whether to perform a second handover from the first communication network to the second communication network based on an updated first set of thresholds, the updated first set of thresholds being based on the updated first diagnostic information.