Speed Group Handover Policy for Wireless Network RLF Reduction
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Solution Overview
Problem
Current wireless network handover technologies face challenges in efficiently managing handovers for mobile devices, particularly in heterogeneous networks with varying cell sizes and mobility profiles, leading to increased Radio Link Failures (RLFs) and excessive signaling delays.
Innovation Solution
The method involves determining a mobility speed group for a mobile device based on its speed and acceleration, which allows for the selection of a handover policy with optimized handover parameters, reducing RLFs and signaling delays by prioritizing target cells and distributing neighboring cell information for improved handover calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover parameters are optimized for high-speed vehicles, then handover robustness is improved, but signaling delays increase for low-speed devices
Solution Approach 1:
The system applies different handover parameter sets tailored to specific device speed groups (high-speed, medium-speed, low-speed vehicles). Each speed group receives customized parameters such as different timeToTrigger values and target cell prioritization rules, allowing optimization for each local condition without compromising other groups.
Solution Approach 2:
The handover parameters are dynamically adjusted based on real-time speed measurements. The system continuously monitors device speed and switches between different parameter sets corresponding to different speed groups, enabling adaptive optimization that responds to changing mobility conditions.
2Productivity
If speed group-based handover policies are implemented, then handover efficiency is improved, but device complexity increases
Solution Approach 1:
The system segments devices into distinct speed groups (high-speed, medium-speed, low-speed) based on measured velocity. Each segment is then managed with dedicated handover policies, simplifying the overall control logic by dividing the complex problem into manageable subsets rather than handling all devices uniformly.
Solution Approach 2:
The system automatically measures device speed and assigns appropriate speed groups without requiring manual configuration or complex user input. The handover decisions are made autonomously based on observed mobility patterns, reducing the burden on network operators to manually manage different device types.
3Reliability
If high-speed vehicles are prevented from handing over to small cells, then Radio Link Failures are reduced, but cell coverage flexibility is limited
Solution Approach 1:
The system applies different handover restrictions based on device speed group. High-speed vehicles are restricted from handover to small cells to prevent RLF, while medium and low-speed devices maintain full handover flexibility to small cells for coverage optimization. This localized differentiation allows simultaneous achievement of reliability for high-speed and flexibility for other scenarios.
Data Source
AI summary
A system that incorporates the subject disclosure may include, for example, determining a mobility speed group assignment for a mobile communication device having a radio resource control connection with a wireless network where the mobility speed group assignment is selected from among a plurality of mobility speed groups according to a speed of the mobile communication device, determining a cell size for a serving cell of the wireless network that is providing the radio resource control connection, and selecting a handover policy based on the mobility speed group assignment and the cell size. Other embodiments are disclosed.