Wake-Up Cancellation Indication for Mobile Power Saving
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Solution Overview
Problem
The existing wake-up indication (WUI) mechanism in New Radio (NR) for user equipment (UE) is unreliable due to beamforming issues and obstacles, leading to increased latency, throughput, and power consumption, as the network node may not be able to transmit wake-up signals effectively, causing the UE to miss data exchanges and requiring inefficient beam/link recovery processes.
Innovation Solution
Instead of signaling the UE to wake up, the network node transmits a wake-up cancellation (WUC) indication to keep the UE in power saving mode, and the UE wakes up only when no power saving information is present or if higher layer signaling configures it to do so, ensuring that it monitors for potential DL/UL activities to prevent missed transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network node transmits wake-up signals to the UE using beamforming, then the UE can be woken up for data exchange, but the link reliability deteriorates due to beam blocking and obstacles
Solution Approach 1:
Instead of transmitting wake-up signals that may be blocked by obstacles, the patent inverts the approach by transmitting wake-up cancellation indications. The UE is configured to wake up by default, but can be canceled if no data activity is scheduled. This inversion eliminates the reliability issue of wake-up signal transmission while maintaining low latency.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network node transmits wake-up cancellation indications through reliable signaling channels. This intermediary approach allows the system to maintain the wake-up function while avoiding the direct transmission reliability problems of beamforming-based wake-up signals.
2Loss of time
If the UE monitors wake-up indications continuously, then the UE can detect data activity promptly, but power consumption increases
Solution Approach 1:
The patent implements periodic action by configuring the UE to wake up at specific intervals or events rather than continuously monitoring. The UE wakes up based on pre-configured timing or triggered by specific conditions, allowing it to balance between prompt detection of data activity and reduced power consumption during idle periods.
3Use of energy by moving object
If the UE stays in power saving mode longer, then power consumption decreases, but latency increases due to missed data transmissions
Solution Approach 1:
The patent employs feedback mechanisms where the network node provides wake-up cancellation indications to the UE based on actual data scheduling decisions. This feedback loop allows the UE to adjust its wake-up behavior dynamically - staying in power saving mode when no data is scheduled (reducing power consumption) while still being able to wake up promptly when data activity is detected (maintaining low latency).
Data Source
AI summary
Various solutions for indicating power saving information with respect to user equipment and network apparatus in mobile communications are described. An apparatus may enter into a power saving mode. The apparatus may monitor a downlink control information (DCI) format while in the power saving mode. The apparatus may determine whether the DCI format is detected. The apparatus may wake up from the power saving mode in an event that the DCI format is not detected.