eDRX PTW Extension for Reduced-Capability NR Devices
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Solution Overview
Problem
Reduced capability NR devices face issues with missed paging messages due to improper configuration of Paging Time Windows (PTW) and inability to dynamically adjust eDRX modes based on traffic profiles, leading to power inefficiency and potential delays in receiving critical alerts.
Innovation Solution
Methods for extending the PTW implicitly or explicitly, optimizing PTW configuration using cell-specific lengths, and gNB assistance to align RAN and core network settings, allowing dynamic eDRX adjustments based on traffic profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PTW length is extended to ensure complete monitoring of paging messages, then the reliability of paging reception is improved, but the power consumption increases due to longer wake-up periods
Solution Approach 1:
The patent implements dynamic PTW extension where the UE monitors paging occasions beyond the originally configured PTW end time when paging messages are detected or suspected. The monitoring is extended dynamically based on actual paging conditions rather than using a fixed PTW length, allowing the device to adapt between reliability and power consumption based on real-time needs.
2Use of energy by moving object
If the eDRX cycle is extended to reduce wake-up frequency and save power, then power efficiency is improved, but the responsiveness to traffic changes and alert delivery deteriorates
Solution Approach 1:
The patent enables dynamic eDRX configuration where the UE can request and receive updated eDRX parameters based on changing traffic profiles. The system transitions from static eDRX cycles to dynamic adjustment mechanisms, allowing the device to switch between power-saving modes and responsive modes according to actual traffic conditions.
Solution Approach 2:
The patent changes the eDRX parameters (cycle length, PTW duration) based on traffic profile assessments. When traffic activity increases or urgency is detected, the system adjusts parameters to reduce eDRX cycle length or extend PTW, thereby adapting the power efficiency vs. responsiveness trade-off to current operational needs.
3Reliability
If the UE monitors paging occasions outside the configured PTW to ensure no messages are missed, then the paging reception reliability is improved, but the device complexity increases
Solution Approach 1:
The patent implements a dynamic monitoring extension mechanism where the UE extends monitoring beyond configured PTW boundaries only when necessary. The extension is triggered by specific conditions (detected paging messages, network indications) rather than being a constant state, simplifying the overall procedure while maintaining reliability.
Data Source
AI summary
Methods, systems, and deices may assist in reducing the possibility that a reduced capability NR device misses a paging message due to the termination of PTW. Methods, systems, and devices may enable a UE to dynamically turn on and off eDRX mode of operation or change eDRX configuration based on its traffic profiles.