LP-WUS PDCCH Monitoring Under C-DRX for Lower UE Power
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing power consumption of User Equipment (UE) in connected and idle modes while maintaining quality of service, particularly in managing power consumption during Connected Mode Discontinuous Reception (C-DRX) configurations.
Innovation Solution
The implementation of Low Power Wake-Up Signal (LP-WUS) mechanisms that allow UE to transition between low-power and active states based on C-DRX configurations, including options for triggering PDCCH monitoring outside or within legacy C-DRX active times, and the use of new timers like drx-InactivityTimer to manage power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE continuously monitors PDCCH in connected mode, then data reception capability is maintained, but power consumption increases
Solution Approach 1:
The patent implements C-DRX configuration where the UE alternates between active periods (monitoring PDCCH) and sleep periods (low power state). The drx-onDurationTimer defines the active monitoring period, after which the UE enters sleep mode. This periodic action allows the UE to maintain data reception capability during active periods while significantly reducing power consumption during sleep periods, directly resolving the contradiction between continuous monitoring and power saving.
2Use of energy by moving object
If UE enters low-power state with C-DRX, then power consumption is reduced, but response time to incoming data increases
Solution Approach 1:
The patent introduces LP-WUS monitoring that occurs before the C-DRX active period. The UE monitors for LP-WUS signals in advance, and upon detecting a wake-up indication, activates the drx-onDurationTimer to enter the active monitoring state. This preliminary action allows the UE to be selectively awakened only when data is available, reducing unnecessary wake-ups and extending battery life while maintaining timely response to actual data arrivals.
3Use of energy by moving object
If LP-WUS monitoring is activated before drx-onDurationTimer, then power consumption is reduced, but complexity of timer management increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE's detection of LP-WUS signals triggers the activation of drx-onDurationTimer. The network sends LP-WUS indications that feedback the UE's need to wake up, and the UE responds by starting the timer and entering active mode. This feedback loop automates the timer management process, reducing the complexity of manual timer configuration while achieving power savings through selective activation of monitoring periods.
Data Source
AI summary
Embodiments herein methods systems and apparatuses for Low Power Wake-Up Signal (LP-WUS) monitoring with Connected-mode Discontinuous Reception (C-DRX) configuration. In some embodiments, a UE may receive, from a network node, activation signaling indicating LP-WUS monitoring. The UE may monitor LP-WUS occasions based on the activation signal. In response to detecting an LP-WUS indicating Physical Downlink Control Channel (PDCCH) monitoring in one of the LP-WUS occasions, the UE may control a timer for PDCCH monitoring.