Wake-up PDCCH Signaling for UE Power Reduction in DRX Cycles
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Solution Overview
Problem
In narrowband communication systems, UE power consumption is unnecessarily high due to continuous monitoring of the Physical Downlink Control Channel (PDCCH) during Discontinuous Reception (DRX) cycles when no data is scheduled, leading to inefficiency in resource usage.
Innovation Solution
A wake-up method that involves monitoring a wake-up PDCCH, with detection of wake-up indication information in Downlink Control Information (DCI) triggering the UE to enter a wake-up mode, which includes starting specific timers, optimizing power consumption and resource usage by allowing the UE to enter a wake-up mode before the default start time of the onDurationTimer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors PDCCH during the entire DRX cycle, then the UE can detect scheduled data, but the UE power consumption increases unnecessarily when no data is scheduled
Solution Approach 1:
The base station sends wake-up signaling before the DRX cycle to preliminarily indicate whether data will be scheduled. The UE uses this advance information to decide whether to activate PDCCH monitoring, avoiding unnecessary power consumption when no data is scheduled while ensuring reliable detection when data is present.
Solution Approach 2:
The UE autonomously decides whether to monitor PDCCH based on the wake-up signaling received from the base station. This self-service mechanism allows the UE to adapt its monitoring behavior to actual data scheduling needs, balancing reliability and power consumption without continuous network control.
2Use of energy by moving object
If the base station uses MAC layer GTS signaling to instruct UE to sleep, then UE power consumption is reduced, but PDCCH and PDSCH resources are consumed for transmitting the command
Solution Approach 1:
The wake-up signaling function is extracted from the MAC layer GTS mechanism and implemented separately using physical layer signaling (PDCCH with specific DCI formats). This separation allows the wake-up indication to be transmitted efficiently without consuming additional MAC layer resources, reducing overall resource consumption while maintaining power saving benefits.
3Reliability
If the UE enters wake-up mode by starting onDurationTimer or drx-InactivityTimer, then the UE can monitor PDCCH for scheduled data, but the active time duration increases
Solution Approach 1:
The UE dynamically adjusts its active time duration based on the wake-up signaling received. When wake-up signaling indicates data scheduling, the UE starts appropriate timers (onDurationTimer or drx-InactivityTimer) to maintain PDCCH monitoring capability. This dynamic adjustment ensures reliable data scheduling while minimizing active time duration compared to continuous monitoring.
Data Source
AI summary
A wake-up method and apparatus, a storage medium and a terminal are provided. The method includes: monitoring a wake-up Physical Downlink Control Channel (PDCCH); if detecting the wake-up PDCCH, determining to enter a wake-up mode; or if detecting the wake-up PDCCH, and wake-up indication information in Downlink Control Information (DCI) transmitted by the wake-up PDCCH indicates to enter the wake-up mode, determining to enter the wake-up mode, wherein entering the wake-up mode comprises starting an onDurationTimer and/or starting a drx-InactivityTimer.