Radio Terminal DRX Configuration for Mobility Control
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Solution Overview
Problem
In mobile communication systems, especially in extended Discontinuous Reception (DRX) states, radio terminals may not receive appropriate measurement configuration information, leading to inadequate mobility control due to being assumed as non-moving MTC terminals, which can result in suboptimal handover decisions.
Innovation Solution
A radio terminal transmits a measurement configuration request to the base station when necessary, especially when the moving speed exceeds a threshold, to obtain and utilize measurement configuration information for accurate mobility control, potentially changing DRX configurations to ensure timely and accurate measurement reporting.
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 measurement configuration information may not be received timely
Solution Approach 1:
The patent applies dynamics by making the DRX cycle length adjustable based on terminal movement state. The terminal can switch between extended DRX cycle (for low power consumption when stationary) and normal DRX cycle (for timely measurement when moving), allowing the system to adapt dynamically between power saving and mobility control reliability
Solution Approach 2:
The patent changes the DRX cycle parameter based on movement detection. When the terminal detects it is moving, it switches from extended DRX configuration to normal DRX configuration, thereby adjusting the measurement timing and ensuring timely reception of measurement configuration information while maintaining power efficiency
2Use of energy by moving object
If extended DRX cycle is used, then power consumption is reduced, but handover decisions may become suboptimal
Solution Approach 1:
The system dynamically adjusts measurement configuration based on terminal movement state. When movement is detected, the terminal switches to normal DRX cycle which provides more frequent monitoring opportunities, thereby improving measurement precision and handover decision accuracy while maintaining power efficiency
Solution Approach 2:
The terminal detects its own movement state and uses this feedback to adjust its DRX configuration. This self-feedback mechanism ensures that measurement precision is maintained when needed (when moving) while power consumption is optimized when not needed (when stationary)
3Adaptability or versatility
If terminal is assumed as non-moving MTC terminal, then extended DRX can be applied, but measurement configuration information is not received
Solution Approach 1:
The patent makes the terminal's DRX configuration dynamic rather than static. The terminal can transition between extended DRX and normal DRX modes based on detected movement, ensuring that measurement configuration information is received when needed while maintaining the adaptability benefits of extended DRX for stationary terminals
Solution Approach 2:
The terminal autonomously detects its own movement state and self-adjusts its DRX configuration accordingly. This self-service capability allows the terminal to request appropriate measurement configuration from the network based on its actual movement state, preventing loss of measurement information while maintaining extended DRX benefits when stationary
Data Source
AI summary
A UE 100 performs, in a connected mode, measurement and measurement reporting on a downlink reference signal, based on “Measurement Config” received from a eNB 200. When the UE 100 has not received the “Measurement Config” from the eNB 200, the UE 100 transmits a measurement configuration request for requesting transmission of the “Measurement Config” to the eNB 200. The UE 100 receives the “Measurement Config” transmitted from the eNB 200 in response to the measurement configuration request.