Mobile Terminal Base Station Reselection Priority Control
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Solution Overview
Problem
Conventional mobile terminal cell reselection methods rely on relative signal quality thresholds, leading to inefficient handover and reselection processes, especially in heterogeneous networks with varying radio resource types and mobility states, resulting in suboptimal service continuity and increased battery consumption.
Innovation Solution
A base station reselection method that assigns different priorities to radio resource types based on the mobile terminal's movement rate, capabilities, and geographical location, using absolute quality thresholds and varying measurement frequencies to optimize cell reselection, thereby reducing 'ping-pong' effects and battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional relative signal quality thresholds are used for cell reselection, then the reselection process is simple to implement, but service continuity deteriorates due to ping-pong effects and suboptimal handover decisions
Solution Approach 1:
The patent applies dynamics by making reselection parameters adaptive rather than static. The network configures different reselection parameters (Qoffset, Treselection, Qhyst) based on the terminal's mobility state (low mobility vs. high mobility). This dynamic adaptation resolves the contradiction by improving service continuity through mobility-aware parameter selection while keeping the implementation manageable through standardized mobility state detection mechanisms.
Solution Approach 2:
The patent changes key reselection parameters (Qoffset, Treselection, Qhyst) based on mobility state. For low mobility terminals, larger Qoffset and longer Treselection are used to prevent ping-pong effects, while high mobility terminals receive smaller Qoffset and shorter Treselection for faster reselection. This parameter adaptation improves service continuity without excessive complexity.
2Productivity
If frequent radio characteristic measurements are performed to improve reselection accuracy, then cell reselection efficiency improves, but battery consumption increases
Solution Approach 1:
The patent dynamically adjusts measurement frequency based on mobility state. High mobility terminals perform measurements more frequently to ensure timely reselection decisions, while low mobility terminals reduce measurement frequency to conserve battery. This dynamic adaptation resolves the contradiction between reselection efficiency and energy consumption.
Solution Approach 2:
The patent changes the measurement period parameter based on mobility state detection. When the terminal transitions from low to high mobility state, the measurement period is reduced to increase measurement frequency. This parameter change improves reselection efficiency for moving terminals while preserving battery life for stationary terminals.
3Ease of operation
If uniform reselection parameters are applied to all terminals, then the system is easy to manage, but performance deteriorates for terminals with different mobility states
Solution Approach 1:
The patent applies local quality by providing different reselection parameters tailored to each terminal's mobility characteristics. Instead of a one-size-fits-all approach, the network configures appropriate parameters (Qoffset, Treselection, Qhyst) based on individual terminal mobility states. This resolves the contradiction by improving reselection performance for each terminal type while maintaining manageable complexity through standardized mobility state categories.
Data Source
AI summary
A base station reselection method for a mobile terminal camped on a base station, which mobile terminal performs a cell reselection function in accordance with reselection parameters. The method characterized by according a different priority to respective radio resource types and varying the reselection parameters in dependence upon the radio resource type of the base station on which the mobile terminal is camped to cause the mobile terminal to preferentially reselect to a higher priority radio resource type when available. A further base station reselection method includes determining radio characteristics of at least one neighboring base station at a frequency, characterized by varying the frequency at which said radio characteristics are determined in dependence upon the rate of movement of the mobile terminal.