Radio Terminal DRX Interval Control for Fast Handover
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Solution Overview
Problem
In radio communication systems, handovers during Discontinuous Reception (DRX) and Discontinuous Transmission (DTX) periods are challenging due to the delay in transitioning between states, which can result in service disruptions when a terminal moves beyond the current cell's range before receiving a handover indication.
Innovation Solution
The base station dynamically controls the DRX/DTX interval based on quality measurement reports from terminals, allowing for immediate handover indications during active intervals, even when the terminal is in a DRX/DTX state, by adjusting the DRX/DTX interval to ensure timely handover completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the terminal is in DRX/DTX state to reduce power consumption, then power consumption is reduced, but handover processing is delayed because the terminal cannot receive handover indications during DRX/DTX periods
Solution Approach 1:
The patent dynamically adjusts the DRX/DTX interval based on terminal mobility conditions. When handover is detected or suspected, the system shortens the DRX/DTX interval to ensure the terminal remains awake long enough to receive handover indications, while maintaining longer intervals during stable conditions to conserve power.
Solution Approach 2:
The system performs preliminary actions by detecting handover conditions (such as measurement reports indicating poor signal quality) before the terminal actually moves out of coverage. This allows the system to proactively adjust DRX/DTX settings in advance, ensuring the terminal will be awake when needed for handover processing.
2Reliability
If the DRX/DTX interval is extended to allow handover processing, then handover can be completed, but power consumption increases due to longer active periods
Solution Approach 1:
The patent changes the DRX/DTX interval parameter dynamically based on terminal conditions. The system monitors signal quality and mobility indicators, then adjusts the DRX/DTX interval to the minimum necessary value to complete handover, avoiding unnecessarily long active periods that would increase power consumption.
3Adaptability or versatility
If the terminal frequently transitions between RRC states to adapt to mobility, then adaptability to different conditions is improved, but the complexity of state management increases
Solution Approach 1:
The patent implements periodic monitoring of signal quality and handover conditions, with systematic adjustments to DRX/DTX intervals based on predefined criteria. This structured approach to state management reduces complexity by following regular patterns rather than requiring complex real-time decisions.
Data Source
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AI summary
It is possible to provide a radio communication terminal device, a radio communication base station device, and a radio communication method capable of rapidly completing a handover even during DRX/DTX. In the devices and the method, a terminal (100) transmits a quality measurement result to a base station (150) at an Active interval. Here, the terminal (100) sets the DRX/DTX interval to a short interval since performance of a handover is predicted. The base station (150) which has received the quality measurement result transmitted from the terminal (100) recognizes that the terminal has set the DRX/DTX interval to a short interval and transmits a handover instruction to the terminal (100) at the Active interval, considering the shortened DRX/DTX interval.