Wake-Up Signal Coverage Indication for 5G UE Power Saving
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in providing effective coverage enhancement during connected discontinuous reception (CDRX) mode, where UEs may miss downlink channels due to beam degradation and power-saving cycles, leading to inefficient power usage and potential data loss.
Innovation Solution
Incorporating wake-up signals (WUS) that include coverage enhancement information, allowing UEs to configure themselves for improved reception of downlink channels by indicating the need for repetitions and monitoring locations, thereby ensuring reliable data reception even during sleep states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If UEs enter sleep state during CDRX mode to save power, then power consumption is reduced, but downlink channels may be missed due to beam degradation and wake-up timing issues
Solution Approach 1:
The base station transmits coverage enhancement information to the UE before the UE enters sleep state. This preliminary action allows the UE to pre-configure reception parameters (such as monitoring occasions, repetition counts, and beam directions) so that when the UE wakes up, it can immediately and reliably receive downlink channels without needing to reconfigure, thus maintaining reliability while enabling power saving.
Solution Approach 2:
The system implements feedback mechanisms where the base station receives information from the UE about its reception capability and channel conditions. Based on this feedback, the base station adjusts the coverage enhancement parameters (like number of repetitions, monitoring locations, and beamforming configurations) to optimize both power consumption and reception reliability dynamically.
2Reliability
If UEs monitor downlink channels continuously to ensure reliable reception, then data reliability is improved, but power consumption increases
Solution Approach 1:
The base station provides coverage enhancement information in advance before the UE needs to monitor downlink channels. This preliminary configuration includes parameters such as monitoring occasions, repetition counts, and beam directions, allowing the UE to enter sleep state confidently and wake up only when needed, thus reducing power consumption while maintaining reliable reception through pre-configured monitoring parameters.
Solution Approach 2:
Instead of continuous monitoring, the system implements periodic monitoring based on configured monitoring occasions. The UE wakes up at specific periodic intervals to monitor downlink channels according to the coverage enhancement information received earlier, and returns to sleep state between these periodic monitoring occasions, thereby reducing power consumption while maintaining data reception reliability.
3Loss of time
If UEs wake up frequently to check for downlink channels, then data reception timeliness is improved, but power efficiency deteriorates
Solution Approach 1:
The base station transmits coverage enhancement information including optimized monitoring occasion configurations before the UE enters sleep state. This preliminary action allows the network to schedule downlink transmissions at optimal times and configure the UE to wake up only at necessary monitoring occasions, reducing unnecessary wake-ups and improving power efficiency while maintaining data reception timeliness through proactive scheduling.
Solution Approach 2:
The system enables the UE to autonomously determine its wake-up timing based on pre-configured monitoring occasions and parameters received from the base station. The UE uses the coverage enhancement information to self-manage its sleep-wake cycle, waking up only when downlink data is expected according to the configured parameters, thus improving power efficiency without sacrificing data reception timeliness.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for coverage enhancement information indication via wake-up signaling. An example method generally includes obtaining a message, the message including: a first field including at least one wake-up indication bit associated with a user equipment (UE) and a second field including coverage information associated with at least one downlink channel. The method may also include monitoring for the at least one downlink channel based, at least in part, on the message.