eI-DRX Cycle Adjustment for Paging Reliability
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) operating under extended idle discontinuous reception (eI-DRX) cycles risk missing paging messages due to potential changes in base station connectivity during long idle periods, leading to delayed re-selection and potential message loss.
Innovation Solution
A method and apparatus for UE and base station to adjust the eI-DRX cycle based on determined mobility and downlink channel reliability, including performing idle-mode measurements and establishing a short paging configuration to ensure timely monitoring of paging messages, allowing for pre-wake-up time adjustments and synchronization of system frame numbers across base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a longer eI-DRX cycle is used to save battery power, then energy consumption is reduced, but the risk of missing paging messages increases due to potential base station handoff during the idle period
Solution Approach 1:
The UE performs measurements of neighboring base stations during the idle period before the DRX cycle expires. This preliminary action allows the UE to detect potential handoff opportunities before they become critical, enabling timely connection switching while still maintaining the benefits of extended idle periods for power saving.
Solution Approach 2:
The system implements feedback mechanisms where the UE reports measurement results to the network, and the network adjusts paging configurations based on UE mobility patterns. This feedback loop allows dynamic optimization of the balance between power saving and paging reliability without requiring continuous monitoring.
2Reliability
If the UE performs frequent base station re-selection measurements to ensure connectivity, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The measurement and monitoring configuration is made dynamic rather than static. The UE adapts its measurement frequency and paging monitoring behavior based on detected mobility conditions. When mobility is detected, measurements become more frequent; when stationary, measurements are reduced, optimizing the balance between reliability and power consumption in real-time.
Solution Approach 2:
The system changes operational parameters such as measurement intervals, paging cycle lengths, and monitoring frequencies based on UE state and mobility conditions. These parameter adjustments allow the system to maintain reliable connectivity when needed while minimizing power consumption during stable conditions.
3Reliability
If the UE awakes early to perform base station re-selection before paging occasion, then connectivity reliability is improved, but the time available for power saving is reduced
Solution Approach 1:
The UE performs base station measurements and evaluations during the idle period before the paging occasion arrives. This preliminary action ensures that if handoff is needed, it can be completed smoothly before the paging reception, avoiding missed pages while minimizing the extent to which the idle period must be shortened.
Solution Approach 2:
The system takes preliminary actions to prevent potential problems before they occur. By detecting mobility trends and preparing for potential handoff during the idle period, the system prevents paging message loss without requiring the UE to wake up significantly earlier than necessary, thus preserving power saving opportunities.
Data Source
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AI summary
A user equipment (UE) may determine when to monitor for downlink (DL) communications such as paging messages based on both a received extended idle discontinuous reception (eI-DRX) cycle and a change in a downlink channel reliability condition of the UE. A base station may also adjust its transmission of paging information to a UE based on a eI-DRX cycle.