PDCCH Monitoring with Go to Sleep Signal for DRX Power Saving
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Solution Overview
Problem
In wireless communication systems, particularly in next-generation wireless access technologies like NR, there is a need to reduce power consumption in terminals during Discontinuous Reception (DRX) cycles, as they unnecessarily wake up for PDCCH monitoring when no data transmission or reception is expected, leading to power wastage.
Innovation Solution
Implementing a method where user equipment (UE) starts a DRX inactivity timer and performs power-saving operations by monitoring the physical downlink control channel (PDCCH) only when the timer is running, and receiving a 'go to sleep' signal, allowing the UE to sleep instead of maintaining an active state during periods of inactivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs PDCCH monitoring during all DRX On Duration periods, then the terminal can detect data transmission opportunities, but the terminal consumes unnecessary power when no data transmission/reception is expected
Solution Approach 1:
The network side performs preliminary action by sending a wake-up signal before the DRX On Duration period. This signal pre-indicates whether data transmission will occur, allowing the terminal to prepare appropriately. If the wake-up signal indicates no data, the terminal can skip PDCCH monitoring and remain in sleep mode, thus avoiding unnecessary power consumption while ensuring data detection reliability when needed.
Solution Approach 2:
The terminal autonomously decides whether to perform PDCCH monitoring based on the received wake-up signal. Instead of blindly following the DRX On Duration schedule, the terminal uses the wake-up signal information to self-determine its active state, skipping monitoring when unnecessary and activating when needed, thereby optimizing power consumption while maintaining reliable data detection.
2Use of energy by moving object
If the terminal skips PDCCH monitoring to save power, then power consumption is reduced, but the terminal may miss data transmission opportunities
Solution Approach 1:
The network side provides feedback through the wake-up signal, which contains information about upcoming data transmission. This feedback mechanism allows the terminal to make informed decisions about whether to activate PDCCH monitoring. The wake-up signal acts as a reliable indicator from the network, ensuring that the terminal activates monitoring only when data transmission is actually scheduled, thus maintaining reliability while reducing power consumption.
Data Source
AI summary
The present specification relates to a method for monitoring a physical downlink control channel (PDCCH) performed by a terminal in a wireless communication system, in which a discontinuous reception (DRX) inactivity timer is started and a PDCCH is monitored while the DRX inactivity timer is in operation, wherein the terminal performs a power saving operation on the basis of receiving a go to sleep signal (GTS) while the DRX inactivity timer is in operation.