Radio Terminal DRX Control for High-Speed Mobility
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Solution Overview
Problem
In mobile communication systems, especially in machine type communication (MTC), the existing Discontinuous Reception (DRX) techniques fail to efficiently manage power consumption when radio terminals move at high speeds, leading to increased power consumption due to prolonged extended DRX cycles and inter-cell asynchronous states.
Innovation Solution
A radio terminal and processor configuration that dynamically adjust the DRX operation by comparing the moving speed of the terminal with a threshold value, changing the measurement cycle to a shorter one when the speed exceeds the threshold, and prohibiting extended DRX operations in inter-cell asynchronous states to maintain mobility control and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If extended DRX cycle is used to reduce power consumption, then power consumption is reduced, but mobility control deteriorates during high-speed movement
Solution Approach 1:
The patent applies dynamics by making the DRX cycle length adaptive rather than fixed. The system dynamically adjusts the DRX cycle based on the terminal's movement speed: using extended DRX cycles when stationary or moving slowly to save power, and switching to shorter cycles when moving fast to maintain mobility control. This resolves the contradiction by allowing the system to optimize for power consumption during low-mobility periods while ensuring reliable mobility control during high-mobility periods.
Solution Approach 2:
The patent changes the parameter of DRX cycle length based on movement speed conditions. By comparing the terminal's movement speed with a threshold value and adjusting the DRX cycle parameter accordingly, the system achieves both power savings during extended cycles and proper mobility control during shorter cycles, resolving the contradiction between power consumption and mobility control reliability.
2Use of energy by moving object
If extended DRX operation is maintained during high-speed movement, then power consumption is reduced, but measurement accuracy deteriorates
Solution Approach 1:
The system dynamically adjusts the measurement cycle based on movement speed. When the terminal is detected to be moving at high speed, the measurement cycle is shortened to ensure accurate mobility measurements and proper handover control. When moving slowly or stationary, the system can use extended measurement cycles to save power. This dynamic adaptation resolves the contradiction between power consumption and measurement accuracy.
Solution Approach 2:
The patent changes the measurement cycle parameter based on the terminal's movement state. By adjusting this parameter according to movement speed thresholds, the system ensures that measurement accuracy is maintained during high-speed movement while allowing power-saving extended cycles during low-speed periods, thus resolving the contradiction between power consumption and measurement precision.
3Use of energy by moving object
If extended DRX cycle is used, then power consumption is reduced, but response time increases
Solution Approach 1:
The system dynamically adjusts the DRX cycle length based on movement speed and network conditions. During high-speed movement or when rapid response is needed, the system uses shorter DRX cycles to reduce response time. During low-speed periods with stable conditions, extended DRX cycles are used to maximize power savings. This dynamic adjustment resolves the contradiction between power consumption and response time.
Solution Approach 2:
The patent changes the DRX cycle parameter based on movement speed comparison with threshold values. When movement speed exceeds the threshold, the system switches to shorter cycles to reduce response time. When below the threshold, extended cycles are used for power savings. This parameter adaptation resolves the contradiction between power consumption and response time loss.
Data Source
AI summary
A radio terminal according to one embodiment is used in a mobile communication system. The radio terminal comprises a controller configured to perform control related to a DRX operation for intermittently monitoring a downlink control channel based on a comparison result of a value related to a moving speed of the radio terminal and a threshold value when the extended DRX operation is set from a network.